/* ═══════════════════════════════════════════════════════════════════════════
   AiSabaq Design System v1.0
   ──────────────────────────────────────────────────────────────────────────
   A modern, accessible, mobile-first design system. Drop into any page with:
     <link rel="stylesheet" href="/static/design-system.css">
   
   Design tokens are exposed as CSS custom properties on :root.
   All components use semantic class names (BEM-ish).
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. DESIGN TOKENS ──────────────────────────────────────────────────── */

:root {
  /* Brand colors */
  --color-primary:        #01411c;   /* Pak green - primary brand */
  --color-primary-light:  #1a5c33;
  --color-primary-dark:   #012d14;
  --color-accent:         #fbbf24;   /* Gold - accent / CTAs */
  --color-accent-hover:   #fcd34d;
  --color-accent-dark:    #d97706;

  /* Surface */
  --color-bg:             #f8f9f5;   /* Off-white */
  --color-bg-elevated:    #ffffff;
  --color-bg-dark:        #0f172a;
  --color-bg-overlay:     rgba(1, 65, 28, 0.6);

  /* Text */
  --color-text:           #0f172a;
  --color-text-muted:     #64748b;
  --color-text-inverse:   #ffffff;
  --color-text-inverse-muted: rgba(255, 255, 255, 0.75);

  /* Borders */
  --color-border:         #e2e8f0;
  --color-border-strong:  #cbd5e1;
  --color-border-focus:   #fbbf24;

  /* Semantic */
  --color-success:        #15803d;
  --color-success-bg:     #dcfce7;
  --color-warning:        #d97706;
  --color-warning-bg:     #fef3c7;
  --color-error:          #dc2626;
  --color-error-bg:       #fee2e2;
  --color-info:           #0ea5e9;
  --color-info-bg:        #e0f2fe;

  /* Typography */
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Inter', 'Outfit', -apple-system, system-ui, sans-serif;
  --font-urdu:    'Noto Nastaliq Urdu', 'Noto Sans', serif;
  --font-mono:    'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;

  --fs-xs:   0.75rem;    /* 12px */
  --fs-sm:   0.875rem;   /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-lg:   1.125rem;   /* 18px */
  --fs-xl:   1.25rem;    /* 20px */
  --fs-2xl:  1.5rem;     /* 24px */
  --fs-3xl:  1.875rem;   /* 30px */
  --fs-4xl:  2.25rem;    /* 36px */
  --fs-5xl:  3rem;       /* 48px */
  --fs-6xl:  3.75rem;    /* 60px */

  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-black:    800;

  --lh-tight:    1.2;
  --lh-snug:     1.35;
  --lh-normal:   1.5;
  --lh-relaxed:  1.7;

  /* Spacing scale (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;

  /* Radii */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows (layered for depth) */
  --shadow-xs:    0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:    0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg:    0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl:    0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --shadow-2xl:   0 25px 50px -12px rgba(0,0,0,0.25);
  --shadow-glow:  0 0 0 4px rgba(251, 191, 36, 0.25);
  --shadow-gold:  0 8px 24px rgba(251, 191, 36, 0.25);

  /* Motion */
  --ease-out:      cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:   cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring:   cubic-bezier(0.34, 1.56, 0.64, 1);

  --duration-fast:   150ms;
  --duration-normal: 250ms;
  --duration-slow:   400ms;

  /* Layout */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1200px;
  --container-2xl: 1400px;

  /* Z-index scale */
  --z-base:    1;
  --z-dropdown: 100;
  --z-sticky:  200;
  --z-modal-backdrop: 900;
  --z-modal:   1000;
  --z-toast:   1100;
  --z-tooltip: 1200;
}

/* ── 2. RESET + BASE ──────────────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; padding: 0; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-text);
}
h1 { font-size: clamp(var(--fs-3xl), 5vw, var(--fs-5xl)); }
h2 { font-size: clamp(var(--fs-2xl), 4vw, var(--fs-4xl)); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }

p { margin: 0 0 var(--space-4); }

/* ── 3. UTILITIES ─────────────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.container-sm { max-width: var(--container-sm); margin: 0 auto; padding: 0 var(--space-5); }

.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;
}

.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid { display: grid; }

/* ── 4. FOCUS STATES (accessibility) ──────────────────────────────────── */

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* ── 5. BUTTONS ──────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-accent);
  color: #451a03;
  box-shadow: var(--shadow-gold);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(251,191,36,0.35);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg);
  border-color: var(--color-primary);
}

.btn-danger {
  background: var(--color-error);
  color: white;
}
.btn-danger:hover:not(:disabled) { background: #b91c1c; }

.btn-sm  { padding: var(--space-2) var(--space-3); font-size: var(--fs-sm); }
.btn-lg  { padding: var(--space-4) var(--space-6); font-size: var(--fs-lg); }
.btn-block { display: flex; width: 100%; }

/* ── 6. CARDS ────────────────────────────────────────────────────────── */

.card {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--duration-normal) var(--ease-out);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-accent);
}

.card-header {
  margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  font-weight: var(--fw-semibold);
}

.card-title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  margin: 0 0 var(--space-2);
}

.card-subtitle {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

/* ── 7. FORMS ────────────────────────────────────────────────────────── */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.field-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}

.field-hint {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.field-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  font-weight: var(--fw-medium);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  appearance: none;
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--color-border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.input-error {
  border-color: var(--color-error);
}
.input-error:focus { box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.15); }

/* Password strength meter */
.strength-meter {
  display: flex;
  gap: 4px;
  margin-top: var(--space-2);
}
.strength-bar {
  flex: 1;
  height: 4px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast) var(--ease-out);
}
.strength-bar.weak   { background: var(--color-error); }
.strength-bar.fair   { background: var(--color-warning); }
.strength-bar.good   { background: var(--color-info); }
.strength-bar.strong { background: var(--color-success); }

/* ── 8. ALERTS / MESSAGES ────────────────────────────────────────────── */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  font-size: var(--fs-sm);
  margin-bottom: var(--space-4);
}
.alert-error   { background: var(--color-error-bg);   border-color: var(--color-error);   color: #991b1b; }
.alert-success { background: var(--color-success-bg); border-color: var(--color-success); color: #14532d; }
.alert-warning { background: var(--color-warning-bg); border-color: var(--color-warning); color: #78350f; }
.alert-info    { background: var(--color-info-bg);    border-color: var(--color-info);    color: #075985; }

.alert-icon {
  font-size: var(--fs-lg);
  flex-shrink: 0;
}

/* ── 9. LOADING STATES ───────────────────────────────────────────────── */

.spinner {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(90deg,
    var(--color-border) 0%,
    var(--color-border-strong) 50%,
    var(--color-border) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
  height: 1em;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line { height: 1em; margin-bottom: 0.5em; }
.skeleton-text { height: 0.875em; margin-bottom: 0.5em; width: 80%; }

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-base);
  border-radius: inherit;
}

/* ── 10. EMPTY STATES ────────────────────────────────────────────────── */

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
}
.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}
.empty-state-title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.empty-state-desc {
  font-size: var(--fs-sm);
  max-width: 400px;
  margin: 0 auto var(--space-4);
}

/* ── 11. BADGES / TAGS ────────────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.badge-accent  { background: var(--color-accent); color: #451a03; }
.badge-success { background: var(--color-success-bg); color: #14532d; }
.badge-warning { background: var(--color-warning-bg); color: #78350f; }
.badge-error   { background: var(--color-error-bg); color: #991b1b; }
.badge-muted   { background: var(--color-border); color: var(--color-text-muted); }

/* ── 12. BREADCRUMBS ─────────────────────────────────────────────────── */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.breadcrumb a {
  color: var(--color-accent-dark);
  font-weight: var(--fw-medium);
  transition: color var(--duration-fast);
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb-sep { color: var(--color-border-strong); }
.breadcrumb-current { color: var(--color-text); font-weight: var(--fw-semibold); }

/* ── 13. NAVIGATION ──────────────────────────────────────────────────── */

.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xl);
  font-weight: var(--fw-black);
  color: var(--color-primary);
}
.navbar-brand span:last-child { color: var(--color-accent-dark); }

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  color: var(--color-text);
  font-weight: var(--fw-medium);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast);
}
.nav-link:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-bg);
}

/* ── 14. HERO SECTIONS ────────────────────────────────────────────────── */

.hero {
  position: relative;
  padding: var(--space-20) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-bg-dark) 100%);
  color: var(--color-text-inverse);
  overflow: hidden;
}

.hero-eyebrow {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: rgba(251, 191, 36, 0.15);
  border: 1px solid rgba(251, 191, 36, 0.3);
  color: var(--color-accent);
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}

.hero-title {
  font-size: clamp(var(--fs-3xl), 6vw, var(--fs-6xl));
  font-weight: var(--fw-black);
  line-height: var(--lh-tight);
  margin: 0 0 var(--space-5);
  letter-spacing: -0.02em;
}
.hero-title .accent { color: var(--color-accent); }

.hero-subtitle {
  font-size: clamp(var(--fs-base), 2vw, var(--fs-xl));
  color: var(--color-text-inverse-muted);
  max-width: 640px;
  margin: 0 auto var(--space-8);
  line-height: var(--lh-relaxed);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

/* ── 15. GRIDS ────────────────────────────────────────────────────────── */

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

/* ── 16. ANIMATIONS ───────────────────────────────────────────────────── */

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

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.anim-fade-in     { animation: fadeIn var(--duration-slow) var(--ease-out); }
.anim-fade-in-up  { animation: fadeInUp var(--duration-slow) var(--ease-out); }
.anim-scale-in    { animation: scaleIn var(--duration-slow) var(--ease-spring); }

/* Staggered animations for lists */
.stagger > *:nth-child(1) { animation-delay: 50ms; }
.stagger > *:nth-child(2) { animation-delay: 100ms; }
.stagger > *:nth-child(3) { animation-delay: 150ms; }
.stagger > *:nth-child(4) { animation-delay: 200ms; }
.stagger > *:nth-child(5) { animation-delay: 250ms; }
.stagger > *:nth-child(6) { animation-delay: 300ms; }

/* ── 17. ACCESSIBILITY — 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;
  }
}

/* ── 18. RESPONSIVE ───────────────────────────────────────────────────── */

@media (max-width: 768px) {
  :root {
    --space-20: 4rem;
    --space-24: 5rem;
  }
  .hero { padding: var(--space-12) 0; }
  .container { padding: 0 var(--space-4); }
  .card { padding: var(--space-4); }
}

@media (max-width: 480px) {
  .navbar { padding: var(--space-3) var(--space-4); }
  .navbar-nav { gap: var(--space-2); }
  .nav-link { padding: var(--space-2); font-size: var(--fs-sm); }
  .grid-auto { grid-template-columns: 1fr; }
}