/* ==========================================================================
   Learn Quran Pak Online — Design System
   Tokens, typography, glass primitives (load before main.css)
   ========================================================================== */

:root {
  /* Typography */
  --font-sans: "Plus Jakarta Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-display: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
  --font-arabic: "Amiri", "Traditional Arabic", "Scheherazade New", serif;

  /* Brand — Emerald + Gold */
  --color-primary: #059669;
  --color-primary-light: #10b981;
  --color-primary-dark: #047857;
  --color-primary-rgb: 5, 150, 105;
  --color-accent: #fbbf24;
  --color-accent-dark: #f59e0b;
  --color-accent-rgb: 251, 191, 36;

  /* Surfaces */
  --color-bg: #f8fafc;
  --color-bg-elevated: #ffffff;
  --color-bg-muted: #f1f5f9;
  --color-bg-alt: #f1f5f9;
  --color-surface: #ffffff;
  --slate-800: #1e293b;
  --slate-950: #020617;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-divider: #e2e8f0;
  --color-error: #ef4444;
  --color-success: #10b981;
  --color-warning: #f59e0b;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #059669 0%, #10b981 50%, #34d399 100%);
  --gradient-gold: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
  --gradient-hero: linear-gradient(160deg, #ecfdf5 0%, #f8fafc 40%, #fffbeb 100%);
  --gradient-primary-soft: linear-gradient(135deg, rgba(5, 150, 105, 0.12), rgba(16, 185, 129, 0.06));
  --gradient-mesh: radial-gradient(ellipse 80% 50% at 20% 20%, rgba(16, 185, 129, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 10%, rgba(251, 191, 36, 0.12), transparent),
    radial-gradient(ellipse 50% 50% at 50% 100%, rgba(5, 150, 105, 0.08), transparent);

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-bg-strong: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-blur: 16px;
  --glass-blur-heavy: 24px;
  --glass-shadow: 0 8px 32px rgba(15, 23, 42, 0.08);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Type scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: clamp(2.5rem, 5vw, 3.75rem);
  --leading-tight: 1.15;
  --leading-normal: 1.6;
  --tracking-tight: -0.03em;

  /* Layout — Stripe-level spacing */
  --container-max: 1280px;
  --section-px: clamp(1rem, 4vw, 2rem);
  --section-py: clamp(3.75rem, 8vw, 7.5rem);
  --section-py-tablet: 5rem;
  --section-py-mobile: 3.75rem;
  --header-height: 72px;

  /* Icon scale (never exceed feature max) */
  --icon-sm: 18px;
  --icon-md: 20px;
  --icon-lg: 28px;
  --icon-feature: 56px;

  /* Typography scale */
  --text-hero: clamp(2.25rem, 5.5vw, 4rem);
  --text-section: clamp(1.625rem, 4vw, 2.625rem);
  --text-body-lg: 1.125rem;
  --leading-relaxed: 1.8;
  --leading-snug: 1.45;
  --pattern-opacity: 0.04;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.25);
  --shadow-glow-primary: 0 0 32px rgba(5, 150, 105, 0.35);
  --shadow-glow-gold: 0 0 32px rgba(251, 191, 36, 0.3);
  --shadow-xl: 0 16px 32px rgba(15, 23, 42, 0.1);
  --shadow-2xl: 0 24px 48px rgba(15, 23, 42, 0.14);

  /* Motion */
  --duration-fast: 150ms;
  --duration-base: 280ms;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-fixed: 100;
  --z-modal: 200;
  --z-sticky: 90;
  --z-toast: 1000;
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-elevated: #1e293b;
  --color-bg-muted: #334155;
  --color-surface: #1e293b;
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-border-strong: #475569;
  --gradient-hero: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --glass-bg: rgba(30, 41, 59, 0.75);
  --glass-bg-strong: rgba(30, 41, 59, 0.92);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

svg {
  display: block;
  flex-shrink: 0;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--duration-fast); }
a:hover { color: var(--color-primary-light); }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

@media (min-width: 768px) {
  .container { padding-inline: 24px; }
}

@media (min-width: 1280px) {
  .container { padding-inline: 32px; }
}
.container--narrow { max-width: 720px; }
.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;
}

/* Glass surface primitives */
.glass-card,
.feature-card--glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-card--strong {
  background: var(--glass-bg-strong);
}

.glass-card--interactive {
  transition:
    transform var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-in-out),
    border-color var(--duration-base) var(--ease-in-out);
  will-change: transform;
}

.glass-card--interactive:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(var(--color-primary-rgb), 0.25);
}

/* Display type scale */
.ds-display {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.ds-arabic {
  font-family: var(--font-arabic);
  direction: rtl;
}

/* Icon tile — max 56px feature icons */
.ds-icon-tile {
  width: var(--icon-feature);
  height: var(--icon-feature);
  max-width: var(--icon-feature);
  max-height: var(--icon-feature);
  border-radius: var(--radius-lg);
  background: rgba(var(--color-primary-rgb), 0.1);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
  transition:
    background var(--duration-base) var(--ease-in-out),
    color var(--duration-base) var(--ease-in-out),
    transform var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base);
}

.ds-icon-tile svg {
  width: 28px;
  height: 28px;
}

.glass-card--interactive:hover .ds-icon-tile,
.feature-card--glass:hover .feature-card__icon {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
}

/* Star rating */
.ds-stars {
  display: inline-flex;
  gap: 2px;
  color: var(--color-accent);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
}

.ds-stars--lg {
  font-size: var(--text-base);
}

/* Ornamental divider */
.divider-ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-block: var(--space-10);
  color: var(--color-text-muted);
}

.divider-ornament::before,
.divider-ornament::after {
  content: "";
  flex: 1;
  max-width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-strong), transparent);
}

.divider-ornament__icon::before {
  content: "✦";
  font-size: var(--text-sm);
  color: var(--color-accent-dark);
}

[data-theme="dark"] .divider-ornament__icon::before {
  color: var(--color-accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--duration-base) var(--ease-in-out),
    color var(--duration-base) var(--ease-in-out),
    border-color var(--duration-base) var(--ease-in-out),
    box-shadow var(--duration-base) var(--ease-in-out),
    transform var(--duration-fast) var(--ease-out-expo);
}

.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.98); }

.btn--primary {
  color: var(--color-text-inverse);
  background: var(--gradient-primary);
  box-shadow: var(--shadow-glow-primary);
}

.btn--primary:hover {
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
}

.btn--ghost {
  color: var(--color-text);
  background: transparent;
  border-color: var(--color-border-strong);
}

.btn--ghost:hover {
  color: var(--color-primary);
  border-color: rgba(var(--color-primary-rgb), 0.4);
  background: rgba(var(--color-primary-rgb), 0.06);
}

.btn--accent,
.btn--gold {
  color: var(--slate-950);
  background: var(--gradient-gold);
  box-shadow: var(--shadow-glow-gold);
}

.btn--accent:hover,
.btn--gold:hover {
  color: var(--slate-950);
  filter: brightness(1.05);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: var(--text-base);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-xs);
}

.btn--outline {
  color: var(--color-primary);
  background: transparent;
  border-color: var(--color-primary);
}

.btn--outline:hover {
  color: var(--color-text-inverse);
  background: var(--color-primary);
}

.btn--icon {
  padding: 0.5rem;
  min-width: 2.5rem;
}