/* ============================================================
   QueStudy Theme — Main CSS
   Premium SaaS Design System
   ============================================================ */

/* ------------------------------------------------------------
   CSS CUSTOM PROPERTIES
   ------------------------------------------------------------ */
:root {
  /* Colors */
  --qs-primary: #2563EB;
  --qs-primary-hover: #1D4ED8;
  --qs-primary-light: rgba(37, 99, 235, 0.06);
  --qs-primary-glow: rgba(37, 99, 235, 0.35);

  --qs-bg: #F8FAFC;
  --qs-bg-alt: #F1F5F9;
  --qs-card: #FFFFFF;
  --qs-border: #E5E7EB;
  --qs-text: #111827;
  --qs-text-secondary: #6B7280;
  --qs-text-tertiary: #9CA3AF;

  --qs-success: #10B981;
  --qs-warning: #F59E0B;
  --qs-danger: #EF4444;
  --qs-info: #06B6D4;

  /* Typography */
  --qs-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --qs-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --qs-space-xs: 4px;
  --qs-space-sm: 8px;
  --qs-space-md: 16px;
  --qs-space-lg: 24px;
  --qs-space-xl: 32px;
  --qs-space-2xl: 48px;
  --qs-space-3xl: 64px;
  --qs-space-4xl: 96px;

  /* Radii */
  --qs-radius: 8px;
  --qs-radius-sm: 6px;
  --qs-radius-lg: 12px;
  --qs-radius-xl: 16px;
  --qs-radius-2xl: 20px;
  --qs-radius-full: 9999px;

  /* Shadows */
  --qs-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --qs-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --qs-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --qs-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --qs-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --qs-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.18);
  --qs-shadow-glow: 0 0 20px var(--qs-primary-glow);
  --qs-shadow-card-hover: 0 12px 24px -4px rgba(0, 0, 0, 0.1), 0 4px 8px -2px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --qs-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --qs-transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --qs-transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --qs-transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-indices */
  --qs-z-dropdown: 500;
  --qs-z-sticky: 600;
  --qs-z-overlay: 900;
  --qs-z-modal: 1000;
  --qs-z-toast: 1100;

  /* Layout */
  --qs-max-width: 1280px;
  --qs-header-height: 72px;
}

/* ------------------------------------------------------------
   CSS RESET & BASE
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  tab-size: 4;
}

body {
  font-family: var(--qs-font);
  background-color: var(--qs-bg);
  color: var(--qs-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

::selection {
  background-color: rgba(37, 99, 235, 0.15);
  color: #1D4ED8;
}

:focus-visible {
  outline: 2px solid var(--qs-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #CBD5E1;
  border-radius: var(--qs-radius-full);
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: #94A3B8;
  background-clip: content-box;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------
   TYPOGRAPHY
   ------------------------------------------------------------ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--qs-text);
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

h1 {
  font-size: 3.5rem;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  line-height: 1.7;
  color: var(--qs-text-secondary);
}

p + p {
  margin-top: 1em;
}

small {
  font-size: 0.875rem;
  color: var(--qs-text-secondary);
}

strong,
b {
  font-weight: 700;
}

a {
  color: var(--qs-primary);
  text-decoration: none;
  transition: color var(--qs-transition);
}

a:hover {
  text-decoration: underline;
}

blockquote {
  border-left: 3px solid var(--qs-primary);
  padding-left: 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--qs-text-secondary);
  font-size: 1.05rem;
}

code {
  font-family: var(--qs-font-mono);
  background: var(--qs-bg-alt);
  padding: 2px 6px;
  border-radius: var(--qs-radius-sm);
  font-size: 0.875em;
  color: var(--qs-primary);
}

pre {
  font-family: var(--qs-font-mono);
  background: #0F172A;
  color: #E2E8F0;
  padding: 20px 24px;
  border-radius: var(--qs-radius-lg);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

hr {
  border: none;
  height: 1px;
  background: var(--qs-border);
  margin: 32px 0;
}

.text-gradient {
  background: linear-gradient(135deg, var(--qs-primary), #7C3AED);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ------------------------------------------------------------
   BUTTONS
   ------------------------------------------------------------ */
.qs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--qs-radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.4;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--qs-transition);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.qs-btn:active {
  transform: scale(0.98);
}

.qs-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.qs-btn svg,
.qs-btn img {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Primary */
.qs-btn-primary {
  background-color: var(--qs-primary);
  color: #FFFFFF;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.qs-btn-primary:hover {
  background-color: var(--qs-primary-hover);
  box-shadow: 0 4px 12px var(--qs-primary-glow);
  transform: translateY(-1px);
  text-decoration: none;
}

.qs-btn-primary:active {
  transform: scale(0.98) translateY(0);
}

/* Outline */
.qs-btn-outline {
  background-color: transparent;
  border: 1.5px solid var(--qs-border);
  color: var(--qs-text);
}

.qs-btn-outline:hover {
  border-color: var(--qs-primary);
  color: var(--qs-primary);
  text-decoration: none;
}

.qs-btn-outline:active {
  background-color: var(--qs-primary-light);
}

/* White */
.qs-btn-white {
  background-color: #FFFFFF;
  color: var(--qs-primary);
  box-shadow: var(--qs-shadow);
}

.qs-btn-white:hover {
  box-shadow: var(--qs-shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
}

/* Ghost */
.qs-btn-ghost {
  background-color: transparent;
  color: var(--qs-text-secondary);
}

.qs-btn-ghost:hover {
  background-color: var(--qs-bg-alt);
  color: var(--qs-text);
  text-decoration: none;
}

/* Danger */
.qs-btn-danger {
  background-color: var(--qs-danger);
  color: #FFFFFF;
}

.qs-btn-danger:hover {
  background-color: #DC2626;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.35);
  text-decoration: none;
}

/* Success */
.qs-btn-success {
  background-color: var(--qs-success);
  color: #FFFFFF;
}

.qs-btn-success:hover {
  background-color: #059669;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
  text-decoration: none;
}

/* Sizes */
.qs-btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
  gap: 6px;
}

.qs-btn-sm svg,
.qs-btn-sm img {
  width: 16px;
  height: 16px;
}

.qs-btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
  gap: 10px;
}

.qs-btn-lg svg,
.qs-btn-lg img {
  width: 20px;
  height: 20px;
}

.qs-btn-xl {
  padding: 18px 44px;
  font-size: 1.05rem;
  gap: 10px;
}

.qs-btn-icon {
  padding: 12px;
  width: 44px;
  height: 44px;
}

.qs-btn-icon.qs-btn-sm {
  padding: 8px;
  width: 36px;
  height: 36px;
}

.qs-btn-icon.qs-btn-lg {
  padding: 16px;
  width: 52px;
  height: 52px;
}

.qs-btn-block {
  display: flex;
  width: 100%;
}

.qs-btn .qs-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: qs-spin 0.6s linear infinite;
}

.qs-btn-outline .qs-spinner {
  border-color: rgba(37, 99, 235, 0.25);
  border-top-color: var(--qs-primary);
}

.qs-btn-group {
  display: inline-flex;
  gap: 0;
}

.qs-btn-group .qs-btn {
  border-radius: 0;
}

.qs-btn-group .qs-btn:first-child {
  border-radius: var(--qs-radius-full) 0 0 var(--qs-radius-full);
}

.qs-btn-group .qs-btn:last-child {
  border-radius: 0 var(--qs-radius-full) var(--qs-radius-full) 0;
}

.qs-btn-group .qs-btn + .qs-btn {
  margin-left: -1.5px;
}

/* ------------------------------------------------------------
   CARDS
   ------------------------------------------------------------ */
.qs-card {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-lg);
  border: 1px solid var(--qs-border);
  padding: 24px;
  transition: box-shadow var(--qs-transition), transform var(--qs-transition);
}

.qs-card:hover {
  box-shadow: var(--qs-shadow-md);
  transform: translateY(-2px);
}

.qs-card-hover {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-lg);
  border: 1px solid var(--qs-border);
  padding: 24px;
  transition: box-shadow var(--qs-transition-spring), transform var(--qs-transition-spring);
  cursor: default;
}

.qs-card-hover:hover {
  box-shadow: var(--qs-shadow-card-hover);
  transform: translateY(-4px);
}

.qs-card-flat {
  background-color: var(--qs-bg);
  border-radius: var(--qs-radius-lg);
  border: none;
  padding: 24px;
}

.qs-card-bordered {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-lg);
  border: 1px solid var(--qs-border);
  padding: 24px;
}

.qs-card-elevated {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-lg);
  border: none;
  padding: 24px;
  box-shadow: var(--qs-shadow-lg);
}

.qs-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--qs-border);
}

.qs-card-header h3,
.qs-card-header h4 {
  margin: 0;
}

.qs-card-body {
  flex: 1;
}

.qs-card-footer {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--qs-border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.qs-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--qs-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--qs-primary-light);
  color: var(--qs-primary);
  margin-bottom: 16px;
  transition: all var(--qs-transition);
}

.qs-card-icon svg {
  width: 24px;
  height: 24px;
}

.qs-card-icon-lg {
  width: 56px;
  height: 56px;
  border-radius: var(--qs-radius-lg);
}

.qs-card-icon-lg svg {
  width: 28px;
  height: 28px;
}

.qs-card-icon-purple {
  background-color: rgba(124, 58, 237, 0.08);
  color: #7C3AED;
}

.qs-card-icon-green {
  background-color: rgba(16, 185, 129, 0.08);
  color: #10B981;
}

.qs-card-icon-orange {
  background-color: rgba(245, 158, 11, 0.08);
  color: #F59E0B;
}

.qs-card-icon-pink {
  background-color: rgba(236, 72, 153, 0.08);
  color: #EC4899;
}

.qs-card-icon-cyan {
  background-color: rgba(6, 182, 212, 0.08);
  color: #06B6D4;
}

/* Pricing Card */
.qs-pricing-card {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-xl);
  border: 1px solid var(--qs-border);
  padding: 32px;
  position: relative;
  transition: all var(--qs-transition-spring);
}

.qs-pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qs-shadow-xl);
}

.qs-pricing-card.featured {
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 1px var(--qs-primary), var(--qs-shadow-lg);
  transform: scale(1.02);
}

.qs-pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.qs-pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--qs-primary), #7C3AED);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--qs-radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.qs-pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--qs-text);
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 16px 0;
}

.qs-pricing-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--qs-text-secondary);
  letter-spacing: 0;
}

.qs-pricing-features {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.qs-pricing-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--qs-text-secondary);
}

.qs-pricing-feature svg {
  width: 18px;
  height: 18px;
  color: var(--qs-success);
  flex-shrink: 0;
}

/* Stat Card */
.qs-stat-card {
  background: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qs-stat-label {
  font-size: 0.85rem;
  color: var(--qs-text-secondary);
  font-weight: 500;
}

.qs-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--qs-text);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.qs-stat-change {
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.qs-stat-change.positive {
  color: var(--qs-success);
}

.qs-stat-change.negative {
  color: var(--qs-danger);
}

/* Testimonial Card */
.qs-testimonial-card {
  background: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-xl);
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.qs-testimonial-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
  color: #F59E0B;
}

.qs-testimonial-stars svg {
  width: 18px;
  height: 18px;
}

.qs-testimonial-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--qs-text);
  flex: 1;
}

.qs-testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--qs-border);
}

.qs-testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--qs-bg-alt);
}

.qs-testimonial-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--qs-text);
}

.qs-testimonial-role {
  font-size: 0.8rem;
  color: var(--qs-text-secondary);
}

/* ------------------------------------------------------------
   FORM ELEMENTS
   ------------------------------------------------------------ */
.qs-form-group {
  margin-bottom: 20px;
}

.qs-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--qs-text);
  margin-bottom: 6px;
}

.qs-label-optional {
  font-weight: 400;
  color: var(--qs-text-tertiary);
  font-size: 0.8rem;
}

.qs-input {
  display: block;
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--qs-border);
  border-radius: var(--qs-radius);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--qs-text);
  background-color: var(--qs-card);
  transition: border-color var(--qs-transition), box-shadow var(--qs-transition);
}

.qs-input::placeholder {
  color: var(--qs-text-tertiary);
}

.qs-input:hover {
  border-color: #D1D5DB;
}

.qs-input:focus {
  outline: none;
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px var(--qs-primary-light), 0 0 0 1px var(--qs-primary);
}

.qs-input.is-error {
  border-color: var(--qs-danger);
}

.qs-input.is-error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1), 0 0 0 1px var(--qs-danger);
}

.qs-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--qs-bg-alt);
}

.qs-input-sm {
  padding: 8px 12px;
  font-size: 0.875rem;
}

.qs-input-lg {
  padding: 14px 20px;
  font-size: 1rem;
}

.qs-input-with-icon {
  position: relative;
}

.qs-input-with-icon .qs-input {
  padding-left: 44px;
}

.qs-input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--qs-text-tertiary);
  pointer-events: none;
}

.qs-input-with-icon .qs-input:focus ~ .qs-input-icon,
.qs-input-with-icon .qs-input:focus + .qs-input-icon {
  color: var(--qs-primary);
}

.qs-input-prefix {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  color: var(--qs-text-secondary);
  font-weight: 500;
  pointer-events: none;
}

.qs-input-with-prefix .qs-input {
  padding-left: 40px;
}

.qs-help-text {
  font-size: 0.8rem;
  color: var(--qs-text-secondary);
  margin-top: 6px;
}

.qs-error-text {
  font-size: 0.8rem;
  color: var(--qs-danger);
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.qs-select {
  display: block;
  width: 100%;
  padding: 12px 40px 12px 16px;
  border: 1.5px solid var(--qs-border);
  border-radius: var(--qs-radius);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--qs-text);
  background-color: var(--qs-card);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' viewBox='0 0 24 24' stroke='%239CA3AF' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 20px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: border-color var(--qs-transition), box-shadow var(--qs-transition);
}

.qs-select:hover {
  border-color: #D1D5DB;
}

.qs-select:focus {
  outline: none;
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px var(--qs-primary-light), 0 0 0 1px var(--qs-primary);
}

.qs-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--qs-bg-alt);
}

.qs-textarea {
  display: block;
  width: 100%;
  min-height: 120px;
  padding: 12px 16px;
  border: 1.5px solid var(--qs-border);
  border-radius: var(--qs-radius);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--qs-text);
  background-color: var(--qs-card);
  resize: vertical;
  transition: border-color var(--qs-transition), box-shadow var(--qs-transition);
}

.qs-textarea::placeholder {
  color: var(--qs-text-tertiary);
}

.qs-textarea:hover {
  border-color: #D1D5DB;
}

.qs-textarea:focus {
  outline: none;
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px var(--qs-primary-light), 0 0 0 1px var(--qs-primary);
}

.qs-textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--qs-bg-alt);
}

/* Checkbox */
.qs-checkbox-wrap {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
}

.qs-checkbox {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--qs-border);
  border-radius: 4px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--qs-transition);
  background-color: var(--qs-card);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' viewBox='0 0 24 24' stroke='white' stroke-width='3'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 0;
}

.qs-checkbox:checked {
  background-color: var(--qs-primary);
  border-color: var(--qs-primary);
  background-size: 12px;
}

.qs-checkbox:focus-visible {
  box-shadow: 0 0 0 3px var(--qs-primary-light);
}

.qs-checkbox-label {
  font-size: 0.9rem;
  color: var(--qs-text);
  line-height: 1.5;
}

/* Radio */
.qs-radio {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--qs-border);
  border-radius: 50%;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--qs-transition);
  background-color: var(--qs-card);
  position: relative;
}

.qs-radio:checked {
  border-color: var(--qs-primary);
  border-width: 5px;
}

.qs-radio:focus-visible {
  box-shadow: 0 0 0 3px var(--qs-primary-light);
}

/* Toggle */
.qs-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  cursor: pointer;
  display: inline-block;
}

.qs-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.qs-toggle-track {
  position: absolute;
  inset: 0;
  background-color: #CBD5E1;
  border-radius: var(--qs-radius-full);
  transition: background-color var(--qs-transition);
}

.qs-toggle input:checked + .qs-toggle-track {
  background-color: var(--qs-primary);
}

.qs-toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #FFFFFF;
  border-radius: 50%;
  box-shadow: var(--qs-shadow-sm);
  transition: transform var(--qs-transition);
}

.qs-toggle input:checked ~ .qs-toggle-thumb {
  transform: translateX(20px);
}

/* Search */
.qs-search {
  position: relative;
  max-width: 480px;
}

.qs-search-input {
  display: block;
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 1.5px solid var(--qs-border);
  border-radius: var(--qs-radius-full);
  font-size: 0.95rem;
  color: var(--qs-text);
  background-color: var(--qs-card);
  transition: border-color var(--qs-transition), box-shadow var(--qs-transition);
}

.qs-search-input::placeholder {
  color: var(--qs-text-tertiary);
}

.qs-search-input:focus {
  outline: none;
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px var(--qs-primary-light), var(--qs-shadow-md);
}

.qs-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--qs-text-tertiary);
  pointer-events: none;
}

.qs-search-shortcut {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 8px;
  background: var(--qs-bg-alt);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-sm);
  font-size: 0.75rem;
  color: var(--qs-text-tertiary);
  font-family: var(--qs-font-mono);
  pointer-events: none;
}

/* ------------------------------------------------------------
   HEADER
   ------------------------------------------------------------ */
.qs-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--qs-header-height);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: all var(--qs-transition);
  backdrop-filter: blur(0px);
}

.qs-header.qs-scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--qs-border);
  box-shadow: var(--qs-shadow-sm);
  backdrop-filter: blur(12px);
}

.qs-header-inner {
  max-width: var(--qs-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.qs-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--qs-text);
  text-decoration: none;
  letter-spacing: -0.025em;
  flex-shrink: 0;
}

.qs-logo:hover {
  text-decoration: none;
  color: var(--qs-text);
}

.qs-logo-icon {
  width: 36px;
  height: 36px;
  background-color: var(--qs-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 900;
  font-size: 1.1rem;
  transition: transform var(--qs-transition);
}

.qs-logo:hover .qs-logo-icon {
  transform: scale(1.05);
}

.qs-logo-text {
  background: linear-gradient(135deg, var(--qs-text), var(--qs-text));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation */
.qs-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.qs-nav-link {
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--qs-text-secondary);
  text-decoration: none;
  border-radius: var(--qs-radius);
  transition: all var(--qs-transition);
  position: relative;
  white-space: nowrap;
}

.qs-nav-link:hover {
  color: var(--qs-text);
  background-color: var(--qs-bg-alt);
  text-decoration: none;
}

.qs-nav-link.active {
  color: var(--qs-primary);
  background-color: var(--qs-primary-light);
}

/* Dropdown */
.qs-dropdown-wrap {
  position: relative;
}

.qs-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  opacity: 0;
  visibility: hidden;
  min-width: 220px;
  background-color: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-lg);
  box-shadow: var(--qs-shadow-xl);
  padding: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: var(--qs-z-dropdown);
}

.qs-dropdown-wrap:hover .qs-dropdown,
.qs-dropdown-wrap.open .qs-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.qs-dropdown-divider {
  height: 1px;
  background: var(--qs-border);
  margin: 6px 0;
}

.qs-dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--qs-radius);
  font-size: 0.88rem;
  color: #374151;
  text-decoration: none;
  transition: all var(--qs-transition);
  cursor: pointer;
  white-space: nowrap;
}

.qs-dropdown-item:hover {
  background-color: var(--qs-bg-alt);
  text-decoration: none;
  color: var(--qs-text);
}

.qs-dropdown-item-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background-color: var(--qs-bg-alt);
  color: var(--qs-text-secondary);
  transition: all var(--qs-transition);
}

.qs-dropdown-item-icon svg {
  width: 16px;
  height: 16px;
}

.qs-dropdown-item:hover .qs-dropdown-item-icon {
  background-color: var(--qs-primary-light);
  color: var(--qs-primary);
}

.qs-dropdown-item-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.qs-dropdown-item-title {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--qs-text);
}

.qs-dropdown-item-desc {
  font-size: 0.78rem;
  color: var(--qs-text-tertiary);
  font-weight: 400;
}

/* Header Right */
.qs-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.qs-header-divider {
  width: 1px;
  height: 24px;
  background: var(--qs-border);
  margin: 0 4px;
}

.qs-search-btn,
.qs-dark-toggle {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background-color: transparent;
  border: none;
  cursor: pointer;
  color: var(--qs-text-secondary);
  transition: all var(--qs-transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qs-search-btn:hover,
.qs-dark-toggle:hover {
  background-color: var(--qs-bg-alt);
  color: var(--qs-text);
}

.qs-search-btn svg,
.qs-dark-toggle svg {
  width: 20px;
  height: 20px;
}

.qs-header-cta {
  margin-left: 4px;
}

/* User Menu */
.qs-user-menu {
  position: relative;
}

.qs-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--qs-border);
  cursor: pointer;
  transition: border-color var(--qs-transition);
}

.qs-user-avatar:hover {
  border-color: var(--qs-primary);
}

.qs-user-menu-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.qs-user-menu.open .qs-user-menu-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Mobile Menu Trigger */
.qs-mobile-trigger {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--qs-radius);
  padding: 8px;
  color: var(--qs-text);
}

.qs-mobile-trigger:hover {
  background-color: var(--qs-bg-alt);
}

.qs-mobile-trigger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: all var(--qs-transition);
  position: relative;
}

.qs-mobile-trigger span::before,
.qs-mobile-trigger span::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: all var(--qs-transition);
  position: absolute;
  left: 0;
}

.qs-mobile-trigger span::before {
  top: -7px;
}

.qs-mobile-trigger span::after {
  top: 7px;
}

/* ------------------------------------------------------------
   MOBILE NAVIGATION
   ------------------------------------------------------------ */
.qs-mobile-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--qs-z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: all var(--qs-transition);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.qs-mobile-overlay.active {
  opacity: 1;
  visibility: visible;
}

.qs-mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  background-color: var(--qs-card);
  z-index: var(--qs-z-modal);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  padding: 24px;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
}

.qs-mobile-menu.active {
  transform: translateX(0);
}

.qs-mobile-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border: none;
  background-color: var(--qs-bg-alt);
  border-radius: var(--qs-radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qs-text-secondary);
  transition: all var(--qs-transition);
}

.qs-mobile-close:hover {
  background-color: var(--qs-border);
  color: var(--qs-text);
}

.qs-mobile-close svg {
  width: 18px;
  height: 18px;
}

.qs-mobile-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--qs-text);
  text-decoration: none;
  margin-bottom: 32px;
  padding-right: 48px;
}

.qs-mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.qs-mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--qs-bg-alt);
  font-size: 1rem;
  color: var(--qs-text);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--qs-transition);
}

.qs-mobile-link:hover {
  color: var(--qs-primary);
  text-decoration: none;
}

.qs-mobile-link-arrow {
  width: 18px;
  height: 18px;
  color: var(--qs-text-tertiary);
  transition: transform var(--qs-transition);
}

.qs-mobile-dropdown {
  display: none;
  padding-left: 16px;
}

.qs-mobile-dropdown.active {
  display: block;
}

.qs-mobile-dropdown .qs-mobile-link {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--qs-text-secondary);
  padding: 10px 0;
}

.qs-mobile-link.active {
  color: var(--qs-primary);
}

.qs-mobile-actions {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--qs-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */
.qs-footer {
  background-color: #0F172A;
  color: #94A3B8;
  padding-top: 80px;
}

.qs-footer-inner {
  max-width: var(--qs-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.qs-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 48px;
}

.qs-footer-brand {
  max-width: 280px;
}

.qs-footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  color: #FFFFFF;
  text-decoration: none;
  margin-bottom: 16px;
}

.qs-footer-logo:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.qs-footer-logo .qs-logo-icon {
  background-color: var(--qs-primary);
}

.qs-footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #94A3B8;
  margin-bottom: 20px;
}

.qs-footer-social {
  display: flex;
  gap: 10px;
}

.qs-footer-social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--qs-radius);
  background-color: #1E293B;
  border: 1px solid #334155;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94A3B8;
  text-decoration: none;
  transition: all var(--qs-transition);
}

.qs-footer-social-link:hover {
  background-color: var(--qs-primary);
  border-color: var(--qs-primary);
  color: #FFFFFF;
  text-decoration: none;
}

.qs-footer-social-link svg {
  width: 16px;
  height: 16px;
}

.qs-footer-widget-title {
  color: #FFFFFF;
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.qs-footer-links {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.qs-footer-link {
  display: block;
  padding: 6px 0;
  color: #94A3B8;
  text-decoration: none;
  font-size: 0.88rem;
  transition: all var(--qs-transition);
}

.qs-footer-link:hover {
  color: #FFFFFF;
  transform: translateX(4px);
  text-decoration: none;
}

.qs-footer-bottom {
  border-top: 1px solid #1E293B;
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 64px;
  font-size: 0.85rem;
}

.qs-footer-bottom-links {
  display: flex;
  gap: 24px;
}

.qs-footer-bottom-link {
  color: #64748B;
  text-decoration: none;
  transition: color var(--qs-transition);
}

.qs-footer-bottom-link:hover {
  color: #FFFFFF;
  text-decoration: none;
}

/* Newsletter */
.qs-newsletter {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.qs-newsletter input {
  flex: 1;
  padding: 12px 16px;
  background-color: #1E293B;
  border: 1px solid #334155;
  border-radius: var(--qs-radius);
  color: #FFFFFF;
  font-size: 0.9rem;
  transition: all var(--qs-transition);
}

.qs-newsletter input::placeholder {
  color: #64748B;
}

.qs-newsletter input:focus {
  outline: none;
  border-color: var(--qs-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.qs-newsletter button {
  background-color: var(--qs-primary);
  color: #FFFFFF;
  border: none;
  padding: 12px 24px;
  border-radius: var(--qs-radius);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--qs-transition);
  white-space: nowrap;
}

.qs-newsletter button:hover {
  background-color: var(--qs-primary-hover);
}

/* Mega Footer */
.qs-footer-mega {
  padding: 64px 0 32px;
}

.qs-footer-mega-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

/* ------------------------------------------------------------
   UTILITY CLASSES
   ------------------------------------------------------------ */
.qs-container {
  max-width: var(--qs-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.qs-container-sm {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.qs-container-md {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
}

.qs-section {
  padding: 96px 0;
}

.qs-section-sm {
  padding: 64px 0;
}

.qs-section-lg {
  padding: 128px 0;
}

.qs-text-center {
  text-align: center;
}

.qs-text-left {
  text-align: left;
}

.qs-text-right {
  text-align: right;
}

.qs-text-primary {
  color: var(--qs-primary);
}

.qs-text-secondary {
  color: var(--qs-text-secondary);
}

.qs-text-muted {
  color: var(--qs-text-tertiary);
}

.qs-text-white {
  color: #FFFFFF;
}

.qs-text-sm {
  font-size: 0.875rem;
}

.qs-text-xs {
  font-size: 0.75rem;
}

.qs-text-lg {
  font-size: 1.125rem;
}

.qs-text-xl {
  font-size: 1.25rem;
}

.qs-font-normal {
  font-weight: 400;
}

.qs-font-medium {
  font-weight: 500;
}

.qs-font-semibold {
  font-weight: 600;
}

.qs-font-bold {
  font-weight: 700;
}

.qs-font-extrabold {
  font-weight: 800;
}

.qs-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.qs-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qs-line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.qs-line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Margins */
.qs-mb-0 { margin-bottom: 0; }
.qs-mb-1 { margin-bottom: 8px; }
.qs-mb-2 { margin-bottom: 16px; }
.qs-mb-3 { margin-bottom: 24px; }
.qs-mb-4 { margin-bottom: 32px; }
.qs-mb-5 { margin-bottom: 48px; }
.qs-mb-6 { margin-bottom: 64px; }

.qs-mt-0 { margin-top: 0; }
.qs-mt-1 { margin-top: 8px; }
.qs-mt-2 { margin-top: 16px; }
.qs-mt-3 { margin-top: 24px; }
.qs-mt-4 { margin-top: 32px; }
.qs-mt-5 { margin-top: 48px; }
.qs-mt-6 { margin-top: 64px; }

.qs-mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* Padding */
.qs-p-0 { padding: 0; }
.qs-p-1 { padding: 8px; }
.qs-p-2 { padding: 16px; }
.qs-p-3 { padding: 24px; }
.qs-p-4 { padding: 32px; }

.qs-pt-0 { padding-top: 0; }
.qs-pb-0 { padding-bottom: 0; }

/* Flexbox */
.qs-flex {
  display: flex;
}

.qs-flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.qs-flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.qs-flex-start {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.qs-flex-end {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.qs-flex-col {
  display: flex;
  flex-direction: column;
}

.qs-flex-wrap {
  flex-wrap: wrap;
}

.qs-items-center {
  align-items: center;
}

.qs-items-start {
  align-items: flex-start;
}

.qs-items-end {
  align-items: flex-end;
}

.qs-justify-center {
  justify-content: center;
}

.qs-justify-between {
  justify-content: space-between;
}

.qs-gap-1 { gap: 8px; }
.qs-gap-2 { gap: 16px; }
.qs-gap-3 { gap: 24px; }
.qs-gap-4 { gap: 32px; }
.qs-gap-5 { gap: 48px; }

/* Grid Layouts */
.qs-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.qs-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.qs-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.qs-grid-2-1 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}

.qs-grid-1-2 {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 24px;
}

/* Positioning */
.qs-relative {
  position: relative;
}

.qs-absolute {
  position: absolute;
}

.qs-fixed {
  position: fixed;
}

.qs-sticky {
  position: sticky;
  top: 0;
}

.qs-inset-0 {
  inset: 0;
}

.qs-z-10 { z-index: 10; }
.qs-z-20 { z-index: 20; }
.qs-z-50 { z-index: 50; }

/* Overflow */
.qs-overflow-hidden {
  overflow: hidden;
}

.qs-overflow-auto {
  overflow: auto;
}

/* Display */
.qs-hidden {
  display: none;
}

.qs-block {
  display: block;
}

.qs-inline-block {
  display: inline-block;
}

.qs-w-full {
  width: 100%;
}

.qs-h-full {
  height: 100%;
}

/* Rounded */
.qs-rounded {
  border-radius: var(--qs-radius);
}

.qs-rounded-lg {
  border-radius: var(--qs-radius-lg);
}

.qs-rounded-xl {
  border-radius: var(--qs-radius-xl);
}

.qs-rounded-full {
  border-radius: var(--qs-radius-full);
}

/* Shadows */
.qs-shadow-none {
  box-shadow: none;
}

.qs-shadow-sm {
  box-shadow: var(--qs-shadow-sm);
}

.qs-shadow {
  box-shadow: var(--qs-shadow);
}

.qs-shadow-md {
  box-shadow: var(--qs-shadow-md);
}

.qs-shadow-lg {
  box-shadow: var(--qs-shadow-lg);
}

.qs-shadow-xl {
  box-shadow: var(--qs-shadow-xl);
}

/* Borders */
.qs-border {
  border: 1px solid var(--qs-border);
}

.qs-border-t {
  border-top: 1px solid var(--qs-border);
}

.qs-border-b {
  border-bottom: 1px solid var(--qs-border);
}

.qs-divider {
  height: 1px;
  background: var(--qs-border);
}

/* Animations */
.qs-animate-fadeInUp {
  animation: qs-fadeInUp 0.5s ease-out forwards;
}

.qs-animate-fadeIn {
  animation: qs-fadeIn 0.4s ease-out forwards;
}

.qs-animate-slideInRight {
  animation: qs-slideInRight 0.4s ease-out forwards;
}

.qs-animate-float {
  animation: qs-float 3s ease-in-out infinite;
}

.qs-animate-pulse {
  animation: qs-pulse 2s ease-in-out infinite;
}

.qs-animate-spin {
  animation: qs-spin 1s linear infinite;
}

.qs-delay-100 { animation-delay: 100ms; }
.qs-delay-200 { animation-delay: 200ms; }
.qs-delay-300 { animation-delay: 300ms; }
.qs-delay-400 { animation-delay: 400ms; }
.qs-delay-500 { animation-delay: 500ms; }

.qs-opacity-0 { opacity: 0; }
.qs-opacity-50 { opacity: 0.5; }
.qs-opacity-100 { opacity: 1; }

/* Visually hidden */
.qs-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ------------------------------------------------------------
   PAGINATION
   ------------------------------------------------------------ */
.qs-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 48px;
}

.qs-page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--qs-radius);
  border: 1px solid var(--qs-border);
  background-color: var(--qs-card);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--qs-text-secondary);
  cursor: pointer;
  transition: all var(--qs-transition);
  text-decoration: none;
}

.qs-page-btn:hover {
  background-color: var(--qs-bg-alt);
  color: var(--qs-text);
  text-decoration: none;
}

.qs-page-btn.active {
  background-color: var(--qs-primary);
  color: #FFFFFF;
  border-color: var(--qs-primary);
}

.qs-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.qs-page-btn svg {
  width: 18px;
  height: 18px;
}

.qs-page-ellipsis {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--qs-text-tertiary);
  font-size: 0.9rem;
}

.qs-page-info {
  font-size: 0.85rem;
  color: var(--qs-text-secondary);
}

/* ------------------------------------------------------------
   WIDGET AREA
   ------------------------------------------------------------ */
.qs-widget {
  margin-bottom: 32px;
}

.qs-widget-title {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--qs-primary);
  color: var(--qs-text);
}

.qs-widget-content {
  font-size: 0.9rem;
  color: var(--qs-text-secondary);
  line-height: 1.7;
}

.qs-widget-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.qs-widget-link {
  display: block;
  padding: 6px 0;
  color: var(--qs-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--qs-transition);
}

.qs-widget-link:hover {
  color: var(--qs-primary);
  padding-left: 4px;
  text-decoration: none;
}

.qs-widget-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.qs-widget-tag {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--qs-bg-alt);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-full);
  font-size: 0.8rem;
  color: var(--qs-text-secondary);
  text-decoration: none;
  transition: all var(--qs-transition);
}

.qs-widget-tag:hover {
  background-color: var(--qs-primary-light);
  border-color: var(--qs-primary);
  color: var(--qs-primary);
  text-decoration: none;
}

/* ------------------------------------------------------------
   BADGES & TAGS
   ------------------------------------------------------------ */
.qs-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--qs-radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.qs-badge-primary {
  background-color: var(--qs-primary-light);
  color: var(--qs-primary);
}

.qs-badge-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: #059669;
}

.qs-badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: #D97706;
}

.qs-badge-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: #DC2626;
}

.qs-badge-info {
  background-color: rgba(6, 182, 212, 0.1);
  color: #0891B2;
}

.qs-badge-neutral {
  background-color: var(--qs-bg-alt);
  color: var(--qs-text-secondary);
}

.qs-badge-purple {
  background-color: rgba(124, 58, 237, 0.1);
  color: #7C3AED;
}

.qs-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
  flex-shrink: 0;
}

.qs-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--qs-radius);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--qs-text-secondary);
  background-color: var(--qs-bg-alt);
  border: 1px solid var(--qs-border);
  transition: all var(--qs-transition);
  cursor: default;
}

.qs-tag-removable {
  cursor: pointer;
}

.qs-tag-remove {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qs-text-tertiary);
  transition: all var(--qs-transition);
}

.qs-tag-remove:hover {
  background-color: var(--qs-border);
  color: var(--qs-text);
}

/* ------------------------------------------------------------
   ALERTS & NOTICES
   ------------------------------------------------------------ */
.qs-alert {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--qs-radius-lg);
  border: 1px solid;
  font-size: 0.9rem;
  line-height: 1.6;
}

.qs-alert-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.qs-alert-content {
  flex: 1;
}

.qs-alert-title {
  font-weight: 700;
  margin-bottom: 2px;
}

.qs-alert-close {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border: none;
  background: none;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--qs-transition);
}

.qs-alert-close:hover {
  opacity: 1;
}

.qs-alert-info {
  background-color: rgba(6, 182, 212, 0.05);
  border-color: rgba(6, 182, 212, 0.2);
  color: #0E7490;
}

.qs-alert-success {
  background-color: rgba(16, 185, 129, 0.05);
  border-color: rgba(16, 185, 129, 0.2);
  color: #047857;
}

.qs-alert-warning {
  background-color: rgba(245, 158, 11, 0.05);
  border-color: rgba(245, 158, 11, 0.2);
  color: #B45309;
}

.qs-alert-danger {
  background-color: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.2);
  color: #B91C1C;
}

/* ------------------------------------------------------------
   TOOLTIP
   ------------------------------------------------------------ */
.qs-tooltip-wrap {
  position: relative;
  display: inline-flex;
}

.qs-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 6px 12px;
  background-color: #0F172A;
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  border-radius: var(--qs-radius);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: all var(--qs-transition);
  z-index: var(--qs-z-toast);
}

.qs-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #0F172A;
}

.qs-tooltip-wrap:hover .qs-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* Bottom Tooltip */
.qs-tooltip-bottom {
  bottom: auto;
  top: calc(100% + 8px);
  transform: translateX(-50%) translateY(-4px);
}

.qs-tooltip-bottom::after {
  top: auto;
  bottom: 100%;
  border-top-color: transparent;
  border-bottom-color: #0F172A;
}

.qs-tooltip-wrap:hover .qs-tooltip-bottom {
  transform: translateX(-50%) translateY(0);
}

/* ------------------------------------------------------------
   AVATAR
   ------------------------------------------------------------ */
.qs-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background-color: var(--qs-bg-alt);
  color: var(--qs-text-secondary);
  font-weight: 600;
}

.qs-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qs-avatar-xs {
  width: 24px;
  height: 24px;
  font-size: 0.65rem;
}

.qs-avatar-sm {
  width: 32px;
  height: 32px;
  font-size: 0.75rem;
}

.qs-avatar-md {
  width: 40px;
  height: 40px;
  font-size: 0.875rem;
}

.qs-avatar-lg {
  width: 56px;
  height: 56px;
  font-size: 1.1rem;
}

.qs-avatar-xl {
  width: 72px;
  height: 72px;
  font-size: 1.4rem;
}

.qs-avatar-group {
  display: flex;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.qs-avatar-group .qs-avatar {
  border: 2px solid var(--qs-card);
  margin-left: -8px;
}

.qs-avatar-group .qs-avatar:last-child {
  margin-left: 0;
}

.qs-avatar-status {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--qs-card);
}

.qs-avatar-status.online {
  background-color: var(--qs-success);
}

.qs-avatar-status.offline {
  background-color: #CBD5E1;
}

.qs-avatar-status.busy {
  background-color: var(--qs-danger);
}

/* ------------------------------------------------------------
   BREADCRUMBS
   ------------------------------------------------------------ */
.qs-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.qs-breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qs-breadcrumb-link {
  color: var(--qs-text-secondary);
  text-decoration: none;
  transition: color var(--qs-transition);
}

.qs-breadcrumb-link:hover {
  color: var(--qs-primary);
  text-decoration: none;
}

.qs-breadcrumb-separator {
  color: var(--qs-text-tertiary);
}

.qs-breadcrumb-current {
  color: var(--qs-text);
  font-weight: 500;
}

/* ------------------------------------------------------------
   TABS
   ------------------------------------------------------------ */
.qs-tabs {
  display: flex;
  align-items: center;
  gap: 0;
  border-bottom: 1px solid var(--qs-border);
  margin-bottom: 24px;
}

.qs-tab {
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--qs-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--qs-transition);
  margin-bottom: -1px;
}

.qs-tab:hover {
  color: var(--qs-text);
}

.qs-tab.active {
  color: var(--qs-primary);
  border-bottom-color: var(--qs-primary);
}

.qs-tab-content {
  display: none;
}

.qs-tab-content.active {
  display: block;
}

/* Pill Tabs */
.qs-tabs-pills {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background-color: var(--qs-bg-alt);
  border-radius: var(--qs-radius-full);
}

.qs-tab-pill {
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--qs-text-secondary);
  background: none;
  border: none;
  border-radius: var(--qs-radius-full);
  cursor: pointer;
  transition: all var(--qs-transition);
}

.qs-tab-pill:hover {
  color: var(--qs-text);
}

.qs-tab-pill.active {
  background-color: var(--qs-card);
  color: var(--qs-text);
  box-shadow: var(--qs-shadow-sm);
}

/* ------------------------------------------------------------
   PROGRESS BAR
   ------------------------------------------------------------ */
.qs-progress {
  width: 100%;
  height: 8px;
  background-color: var(--qs-bg-alt);
  border-radius: var(--qs-radius-full);
  overflow: hidden;
}

.qs-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--qs-primary), #7C3AED);
  border-radius: var(--qs-radius-full);
  transition: width 0.5s ease-out;
}

.qs-progress-sm {
  height: 4px;
}

.qs-progress-lg {
  height: 12px;
}

.qs-progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.85rem;
}

.qs-progress-label-text {
  color: var(--qs-text-secondary);
}

.qs-progress-label-value {
  color: var(--qs-text);
  font-weight: 600;
}

/* ------------------------------------------------------------
   TABLE
   ------------------------------------------------------------ */
.qs-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-lg);
}

.qs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.qs-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--qs-text-secondary);
  background-color: var(--qs-bg);
  border-bottom: 1px solid var(--qs-border);
  white-space: nowrap;
}

.qs-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--qs-border);
  color: var(--qs-text);
  vertical-align: middle;
}

.qs-table tbody tr:last-child td {
  border-bottom: none;
}

.qs-table tbody tr:hover {
  background-color: var(--qs-bg);
}

.qs-table-striped tbody tr:nth-child(even) {
  background-color: var(--qs-bg);
}

.qs-table-compact th,
.qs-table-compact td {
  padding: 8px 12px;
}

/* ------------------------------------------------------------
   ACCORDION / FAQ
   ------------------------------------------------------------ */
.qs-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.qs-accordion-item {
  background-color: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-lg);
  overflow: hidden;
  transition: box-shadow var(--qs-transition);
}

.qs-accordion-item.active {
  box-shadow: var(--qs-shadow-md);
}

.qs-accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--qs-text);
  transition: color var(--qs-transition);
}

.qs-accordion-header:hover {
  color: var(--qs-primary);
}

.qs-accordion-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--qs-text-secondary);
  transition: transform var(--qs-transition);
}

.qs-accordion-item.active .qs-accordion-icon {
  transform: rotate(180deg);
  color: var(--qs-primary);
}

.qs-accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.qs-accordion-item.active .qs-accordion-body {
  max-height: 500px;
}

.qs-accordion-content {
  padding: 0 20px 20px;
  font-size: 0.925rem;
  color: var(--qs-text-secondary);
  line-height: 1.7;
}

/* ------------------------------------------------------------
   MODAL
   ------------------------------------------------------------ */
.qs-modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--qs-z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--qs-transition);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.qs-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.qs-modal {
  background-color: var(--qs-card);
  border-radius: var(--qs-radius-xl);
  box-shadow: var(--qs-shadow-2xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.qs-modal-overlay.active .qs-modal {
  transform: translateY(0) scale(1);
}

.qs-modal-sm {
  max-width: 400px;
}

.qs-modal-lg {
  max-width: 680px;
}

.qs-modal-xl {
  max-width: 880px;
}

.qs-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 24px 0;
}

.qs-modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--qs-text);
}

.qs-modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--qs-radius);
  border: none;
  background-color: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qs-text-secondary);
  transition: all var(--qs-transition);
}

.qs-modal-close:hover {
  background-color: var(--qs-bg-alt);
  color: var(--qs-text);
}

.qs-modal-body {
  padding: 24px;
}

.qs-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 0 24px 24px;
}

/* ------------------------------------------------------------
   TOAST / SNACKBAR
   ------------------------------------------------------------ */
.qs-toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: var(--qs-z-toast);
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 400px;
}

.qs-toast {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background-color: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-lg);
  box-shadow: var(--qs-shadow-xl);
  font-size: 0.9rem;
  animation: qs-slideInRight 0.3s ease-out;
}

.qs-toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.qs-toast-content {
  flex: 1;
  color: var(--qs-text);
}

.qs-toast-close {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--qs-text-tertiary);
  transition: color var(--qs-transition);
}

.qs-toast-close:hover {
  color: var(--qs-text);
}

.qs-toast-success {
  border-left: 3px solid var(--qs-success);
}

.qs-toast-error {
  border-left: 3px solid var(--qs-danger);
}

.qs-toast-warning {
  border-left: 3px solid var(--qs-warning);
}

.qs-toast-info {
  border-left: 3px solid var(--qs-info);
}

/* ------------------------------------------------------------
   EMPTY STATE
   ------------------------------------------------------------ */
.qs-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 64px 24px;
}

.qs-empty-state-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--qs-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--qs-text-tertiary);
}

.qs-empty-state-icon svg {
  width: 36px;
  height: 36px;
}

.qs-empty-state-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--qs-text);
  margin-bottom: 8px;
}

.qs-empty-state-desc {
  font-size: 0.925rem;
  color: var(--qs-text-secondary);
  max-width: 400px;
  margin-bottom: 24px;
}

/* ------------------------------------------------------------
   SKELETON LOADING
   ------------------------------------------------------------ */
.qs-skeleton {
  background: linear-gradient(90deg, var(--qs-bg-alt) 25%, #E2E8F0 50%, var(--qs-bg-alt) 75%);
  background-size: 200% 100%;
  animation: qs-shimmer 1.5s infinite;
  border-radius: var(--qs-radius);
}

.qs-skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  width: 100%;
}

.qs-skeleton-text:last-child {
  width: 60%;
}

.qs-skeleton-title {
  height: 24px;
  width: 40%;
  margin-bottom: 16px;
}

.qs-skeleton-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
}

.qs-skeleton-card {
  height: 200px;
  border-radius: var(--qs-radius-lg);
}

.qs-skeleton-image {
  height: 160px;
  border-radius: var(--qs-radius-lg);
}

/* ------------------------------------------------------------
   HERO SECTION
   ------------------------------------------------------------ */
.qs-hero {
  padding: 160px 0 96px;
  position: relative;
  overflow: hidden;
}

.qs-hero-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.qs-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 6px 6px 14px;
  background-color: var(--qs-card);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-full);
  font-size: 0.85rem;
  color: var(--qs-text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--qs-shadow);
}

.qs-hero-badge-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background-color: var(--qs-primary);
  color: #FFFFFF;
  border-radius: var(--qs-radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--qs-transition);
}

.qs-hero-badge-link:hover {
  background-color: var(--qs-primary-hover);
  text-decoration: none;
}

.qs-hero h1 {
  margin-bottom: 24px;
}

.qs-hero-desc {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--qs-text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.qs-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.qs-hero-social-proof {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--qs-text-secondary);
}

.qs-hero-avatars {
  display: flex;
}

.qs-hero-avatars .qs-avatar {
  border: 2px solid var(--qs-card);
  margin-left: -8px;
}

.qs-hero-avatars .qs-avatar:first-child {
  margin-left: 0;
}

.qs-hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

/* ------------------------------------------------------------
   FEATURE / BENEFIT SECTION
   ------------------------------------------------------------ */
.qs-feature-section {
  position: relative;
}

.qs-feature-header {
  max-width: 640px;
  margin: 0 auto 64px;
  text-align: center;
}

.qs-feature-header h2 {
  margin-bottom: 16px;
}

.qs-feature-header p {
  font-size: 1.1rem;
}

.qs-feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.qs-feature-row.reverse .qs-feature-row-content {
  order: 2;
}

.qs-feature-row.reverse .qs-feature-row-visual {
  order: 1;
}

.qs-feature-row-content h3 {
  margin-bottom: 16px;
}

.qs-feature-row-content p {
  margin-bottom: 24px;
}

.qs-feature-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qs-feature-list-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--qs-text-secondary);
}

.qs-feature-list-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--qs-success);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.qs-feature-list-icon svg {
  width: 14px;
  height: 14px;
}

.qs-feature-visual {
  background-color: var(--qs-bg-alt);
  border: 1px solid var(--qs-border);
  border-radius: var(--qs-radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ------------------------------------------------------------
   CTA SECTION
   ------------------------------------------------------------ */
.qs-cta {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  border-radius: var(--qs-radius-2xl);
  padding: 80px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.qs-cta h2 {
  color: #FFFFFF;
  margin-bottom: 16px;
}

.qs-cta p {
  color: #94A3B8;
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 32px;
}

.qs-cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.qs-cta-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

/* ------------------------------------------------------------
   SECTION BACKGROUND VARIANTS
   ------------------------------------------------------------ */
.qs-bg-white {
  background-color: var(--qs-card);
}

.qs-bg-light {
  background-color: var(--qs-bg);
}

.qs-bg-alt {
  background-color: var(--qs-bg-alt);
}

.qs-bg-dark {
  background-color: #0F172A;
  color: #FFFFFF;
}

.qs-bg-dark p {
  color: #94A3B8;
}

.qs-bg-dark h2,
.qs-bg-dark h3,
.qs-bg-dark h4 {
  color: #FFFFFF;
}

.qs-bg-gradient {
  background: linear-gradient(135deg, var(--qs-primary), #7C3AED);
  color: #FFFFFF;
}

.qs-bg-gradient p {
  color: rgba(255, 255, 255, 0.8);
}

.qs-bg-pattern {
  background-image: radial-gradient(#E5E7EB 1px, transparent 1px);
  background-size: 24px 24px;
}

/* ------------------------------------------------------------
   DARK MODE
   ------------------------------------------------------------ */
body.qs-dark {
  --qs-bg: #0F172A;
  --qs-bg-alt: #1E293B;
  --qs-card: #1E293B;
  --qs-border: #334155;
  --qs-text: #F1F5F9;
  --qs-text-secondary: #94A3B8;
  --qs-text-tertiary: #64748B;
}

body.qs-dark .qs-header.qs-scrolled {
  background-color: rgba(15, 23, 42, 0.95);
}

body.qs-dark .qs-input,
body.qs-dark .qs-select,
body.qs-dark .qs-textarea {
  background-color: #0F172A;
  border-color: #334155;
}

body.qs-dark .qs-input:hover,
body.qs-dark .qs-select:hover,
body.qs-dark .qs-textarea:hover {
  border-color: #475569;
}

body.qs-dark .qs-input::placeholder,
body.qs-dark .qs-select::placeholder,
body.qs-dark .qs-textarea::placeholder {
  color: #64748B;
}

body.qs-dark .qs-dropdown {
  background-color: #1E293B;
  border-color: #334155;
}

body.qs-dark .qs-dropdown-item {
  color: #E2E8F0;
}

body.qs-dark .qs-dropdown-item:hover {
  background-color: #334155;
}

body.qs-dark .qs-dropdown-item-title {
  color: #F1F5F9;
}

body.qs-dark .qs-checkbox {
  background-color: #0F172A;
  border-color: #334155;
}

body.qs-dark .qs-radio {
  background-color: #0F172A;
  border-color: #334155;
}

body.qs-dark .qs-toggle-track {
  background-color: #334155;
}

body.qs-dark .qs-search-input {
  background-color: #0F172A;
  border-color: #334155;
  color: #F1F5F9;
}

body.qs-dark .qs-table th {
  background-color: #1E293B;
  border-bottom-color: #334155;
}

body.qs-dark .qs-table td {
  border-bottom-color: #334155;
}

body.qs-dark .qs-table tbody tr:hover {
  background-color: #1E293B;
}

body.qs-dark .qs-accordion-item {
  background-color: #1E293B;
  border-color: #334155;
}

body.qs-dark .qs-modal {
  background-color: #1E293B;
}

body.qs-dark .qs-toast {
  background-color: #1E293B;
  border-color: #334155;
}

body.qs-dark .qs-widget-tag {
  background-color: #1E293B;
  border-color: #334155;
  color: #94A3B8;
}

body.qs-dark .qs-progress {
  background-color: #1E293B;
}

body.qs-dark .qs-skeleton {
  background: linear-gradient(90deg, #1E293B 25%, #334155 50%, #1E293B 75%);
  background-size: 200% 100%;
}

body.qs-dark code {
  background-color: #1E293B;
  color: #60A5FA;
}

body.qs-dark pre {
  background-color: #020617;
}

body.qs-dark blockquote {
  border-left-color: #334155;
}

body.qs-dark hr {
  background-color: #334155;
}

body.qs-dark .qs-hero-badge {
  background-color: #1E293B;
  border-color: #334155;
}

body.qs-dark .qs-feature-visual {
  background-color: #0F172A;
  border-color: #334155;
}

body.qs-dark .qs-alert-info {
  background-color: rgba(6, 182, 212, 0.1);
  border-color: rgba(6, 182, 212, 0.15);
}

body.qs-dark .qs-alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.15);
}

body.qs-dark .qs-alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.15);
}

body.qs-dark .qs-alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.15);
}

body.qs-dark .qs-tooltip {
  background-color: #F1F5F9;
  color: #0F172A;
}

body.qs-dark .qs-tooltip::after {
  border-top-color: #F1F5F9;
}

body.qs-dark .qs-tooltip-bottom::after {
  border-top-color: transparent;
  border-bottom-color: #F1F5F9;
}

body.qs-dark .qs-empty-state-icon {
  background-color: #1E293B;
}

body.qs-dark .qs-btn-outline {
  border-color: #334155;
  color: #E2E8F0;
}

body.qs-dark .qs-btn-outline:hover {
  border-color: var(--qs-primary);
  color: var(--qs-primary);
}

body.qs-dark ::-webkit-scrollbar-thumb {
  background: #334155;
}

body.qs-dark ::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

body.qs-dark ::selection {
  background-color: rgba(37, 99, 235, 0.3);
  color: #FFFFFF;
}

/* ------------------------------------------------------------
   ANIMATIONS
   ------------------------------------------------------------ */
@keyframes qs-fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes qs-fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes qs-fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes qs-slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes qs-slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes qs-scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes qs-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes qs-float-slow {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  33% {
    transform: translateY(-8px) rotate(1deg);
  }
  66% {
    transform: translateY(-4px) rotate(-1deg);
  }
}

@keyframes qs-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

@keyframes qs-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes qs-shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes qs-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes qs-wiggle {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-3deg);
  }
  75% {
    transform: rotate(3deg);
  }
}

@keyframes qs-progress-fill {
  from {
    width: 0%;
  }
  to {
    width: var(--qs-progress-value, 0%);
  }
}

@keyframes qs-gradient-shift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Scroll-triggered fade-in */
.qs-fade-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.qs-fade-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.qs-stagger > * {
  opacity: 0;
  transform: translateY(12px);
  animation: qs-fadeInUp 0.4s ease-out forwards;
}

.qs-stagger > *:nth-child(1) { animation-delay: 0ms; }
.qs-stagger > *:nth-child(2) { animation-delay: 80ms; }
.qs-stagger > *:nth-child(3) { animation-delay: 160ms; }
.qs-stagger > *:nth-child(4) { animation-delay: 240ms; }
.qs-stagger > *:nth-child(5) { animation-delay: 320ms; }
.qs-stagger > *:nth-child(6) { animation-delay: 400ms; }
.qs-stagger > *:nth-child(7) { animation-delay: 480ms; }
.qs-stagger > *:nth-child(8) { animation-delay: 560ms; }
.qs-stagger > *:nth-child(9) { animation-delay: 640ms; }
.qs-stagger > *:nth-child(10) { animation-delay: 720ms; }

/* ------------------------------------------------------------
   RESPONSIVE — TABLET (max-width: 1024px)
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 2rem;
  }

  .qs-hero {
    padding: 140px 0 72px;
  }

  .qs-section {
    padding: 72px 0;
  }

  .qs-section-lg {
    padding: 96px 0;
  }

  .qs-footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
  }

  .qs-footer-brand {
    grid-column: 1 / -1;
    max-width: 100%;
  }

  .qs-feature-row {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .qs-feature-row.reverse .qs-feature-row-content {
    order: 1;
  }

  .qs-feature-row.reverse .qs-feature-row-visual {
    order: 2;
  }

  .qs-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .qs-pricing-card.featured {
    transform: none;
  }

  .qs-pricing-card.featured:hover {
    transform: translateY(-4px);
  }

  .qs-footer-mega-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

/* ------------------------------------------------------------
   RESPONSIVE — MOBILE (max-width: 768px)
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  :root {
    --qs-header-height: 64px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.35rem;
  }

  .qs-nav {
    display: none;
  }

  .qs-mobile-trigger {
    display: flex;
  }

  .qs-header-cta {
    display: none;
  }

  .qs-hero {
    padding: 120px 0 56px;
  }

  .qs-hero h1 {
    font-size: 2.25rem;
  }

  .qs-hero-desc {
    font-size: 1.05rem;
  }

  .qs-hero-actions {
    flex-direction: column;
  }

  .qs-hero-actions .qs-btn {
    width: 100%;
  }

  .qs-section {
    padding: 56px 0;
  }

  .qs-section-sm {
    padding: 40px 0;
  }

  .qs-section-lg {
    padding: 72px 0;
  }

  .qs-grid-2,
  .qs-grid-3,
  .qs-grid-4 {
    grid-template-columns: 1fr;
  }

  .qs-grid-2-1,
  .qs-grid-1-2 {
    grid-template-columns: 1fr;
  }

  .qs-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .qs-footer-brand {
    grid-column: 1 / -1;
  }

  .qs-footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .qs-footer-bottom-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .qs-cta {
    padding: 56px 24px;
    border-radius: var(--qs-radius-xl);
  }

  .qs-cta-actions {
    flex-direction: column;
  }

  .qs-cta-actions .qs-btn {
    width: 100%;
  }

  .qs-feature-header {
    margin-bottom: 40px;
  }

  .qs-pricing-card {
    padding: 24px;
  }

  .qs-pricing-price {
    font-size: 2.5rem;
  }

  .qs-pagination {
    flex-wrap: wrap;
  }

  .qs-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .qs-table-wrap {
    border-radius: var(--qs-radius);
  }

  .qs-modal {
    max-width: 100%;
    border-radius: var(--qs-radius-xl);
    margin: 16px;
  }

  .qs-toast-container {
    left: 16px;
    right: 16px;
    max-width: none;
  }

  .qs-footer-mega-grid {
    grid-template-columns: 1fr;
  }

  .qs-hero-social-proof {
    flex-direction: column;
  }

  .qs-accordion-header {
    padding: 14px 16px;
    font-size: 0.925rem;
  }

  .qs-accordion-content {
    padding: 0 16px 16px;
  }

  .qs-alert {
    padding: 14px 16px;
  }

  .qs-newsletter {
    flex-direction: column;
  }

  .qs-newsletter button {
    width: 100%;
  }

  .qs-breadcrumb {
    font-size: 0.8rem;
  }
}

/* ------------------------------------------------------------
   RESPONSIVE — SMALL MOBILE (max-width: 480px)
   ------------------------------------------------------------ */
@media (max-width: 480px) {
  h1 {
    font-size: 1.85rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .qs-hero {
    padding: 110px 0 40px;
  }

  .qs-hero h1 {
    font-size: 1.85rem;
  }

  .qs-hero-desc {
    font-size: 0.95rem;
  }

  .qs-btn-lg {
    padding: 14px 28px;
    font-size: 0.9rem;
  }

  .qs-footer-grid {
    grid-template-columns: 1fr;
  }

  .qs-pricing-card {
    padding: 20px;
  }

  .qs-pricing-price {
    font-size: 2rem;
  }

  .qs-stat-value {
    font-size: 1.5rem;
  }

  .qs-testimonial-card {
    padding: 24px;
  }

  .qs-empty-state {
    padding: 40px 16px;
  }

  .qs-modal-header,
  .qs-modal-body,
  .qs-modal-footer {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* ------------------------------------------------------------
   PRINT STYLES
   ------------------------------------------------------------ */
@media print {
  .qs-header,
  .qs-mobile-overlay,
  .qs-mobile-menu,
  .qs-footer,
  .qs-btn,
  .qs-dark-toggle,
  .qs-pagination {
    display: none !important;
  }

  body {
    background: #FFFFFF;
    color: #000000;
    font-size: 12pt;
  }

  h1, h2, h3, h4, h5, h6 {
    color: #000000;
    page-break-after: avoid;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }

  .qs-card,
  .qs-container {
    padding: 0;
    border: none;
    box-shadow: none;
  }

  img {
    max-width: 100% !important;
  }
}