/* ============================================================
   AVANTA INSTITUTE OF AVIATION EXCELLENCE
   Design System — main.css
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,800;1,400;1,600&family=Inter:wght@300;400;500;600;700;800&family=Rajdhani:wght@400;500;600;700&display=swap');

/* ─── CSS Custom Properties ─── */
:root {
  /* Brand Colors */
  --navy:          #071B3B;
  --navy-mid:      #0D2D5A;
  --navy-light:    #1A3F70;
  --navy-dark:     #040F22;
  --gold:          #D4AF37;
  --gold-light:    #F0D060;
  --gold-pale:     #FDF6D8;
  --gold-dark:     #A8891F;
  --white:         #FFFFFF;
  --off-white:     #F8F9FC;
  --cream:         #FEFCF3;

  /* Neutrals */
  --gray-50:       #F9FAFB;
  --gray-100:      #EEF1F7;
  --gray-200:      #DDE2EE;
  --gray-300:      #C4CCE0;
  --gray-400:      #8F9EC0;
  --gray-500:      #6B7A99;
  --gray-600:      #4A567A;
  --gray-700:      #2E3A5C;
  --gray-800:      #1B2540;
  --gray-900:      #0A0F1E;

  /* Semantic */
  --text-primary:   #071B3B;
  --text-secondary: #4A567A;
  --text-muted:     #6B7A99;
  --text-light:     rgba(255,255,255,0.85);
  --text-gold:      #D4AF37;

  /* Glass */
  --glass-white:    rgba(255,255,255,0.08);
  --glass-white-md: rgba(255,255,255,0.12);
  --glass-navy:     rgba(7,27,59,0.85);
  --glass-gold:     rgba(212,175,55,0.15);

  /* Borders */
  --border-light:   rgba(255,255,255,0.12);
  --border-gold:    rgba(212,175,55,0.35);
  --border-navy:    rgba(7,27,59,0.15);

  /* Shadows */
  --shadow-sm:      0 1px 3px rgba(7,27,59,0.08), 0 1px 2px rgba(7,27,59,0.06);
  --shadow-md:      0 4px 16px rgba(7,27,59,0.12), 0 2px 6px rgba(7,27,59,0.08);
  --shadow-lg:      0 10px 40px rgba(7,27,59,0.15), 0 4px 16px rgba(7,27,59,0.10);
  --shadow-xl:      0 20px 60px rgba(7,27,59,0.20), 0 8px 24px rgba(7,27,59,0.12);
  --shadow-gold:    0 4px 24px rgba(212,175,55,0.25);
  --shadow-glow:    0 0 40px rgba(212,175,55,0.20);

  /* Typography */
  --font-display:   'Playfair Display', Georgia, serif;
  --font-body:      'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-accent:    'Rajdhani', sans-serif;

  /* Spacing */
  --section-py:     100px;
  --section-py-sm:  60px;
  --container:      1280px;
  --container-md:   960px;
  --container-sm:   720px;

  /* Radii */
  --radius-sm:      6px;
  --radius-md:      12px;
  --radius-lg:      20px;
  --radius-xl:      28px;
  --radius-full:    9999px;

  /* Transitions */
  --ease:           cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring:    cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:  150ms;
  --duration-base:  280ms;
  --duration-slow:  500ms;

  /* Z-index */
  --z-sticky:       100;
  --z-modal:        500;
  --z-toast:        600;
}

/* ─── Reset & Base ─── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol { list-style: none; }

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
}

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.container-md {
  width: 100%;
  max-width: var(--container-md);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Section Utilities ─── */
.section {
  padding: var(--section-py) 0;
}

.section-sm {
  padding: 60px 0;
}

.section-label {
  font-family: var(--font-accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gold);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.section-label::before {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--gold);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.18;
  color: var(--navy);
  margin-bottom: 20px;
}

.section-title em {
  font-style: italic;
  color: var(--gold);
}

.section-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 620px;
}

.section-header {
  margin-bottom: 64px;
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-label {
  justify-content: center;
}

.section-header--center .section-subtitle {
  margin: 0 auto;
}

/* ─── Typography Scale ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--navy);
}

.text-display {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
}

.text-hero {
  font-size: clamp(2rem, 5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.1;
}

.text-xl {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
}

.text-lg {
  font-size: 1.25rem;
  font-weight: 600;
}

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

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

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

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  border-radius: var(--radius-full);
  transition: all var(--duration-base) var(--ease);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: var(--gold);
  color: var(--navy);
  box-shadow: var(--shadow-gold);
}

.btn-primary::before {
  background: rgba(255,255,255,0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(212,175,55,0.40);
}

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

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.5);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--gold);
  padding: 14px 0;
  border-radius: 0;
}

.btn-ghost:hover {
  gap: 14px;
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1rem;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.8125rem;
}

/* ─── Badge ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-family: var(--font-accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
}

.badge-gold {
  background: var(--gold-pale);
  color: var(--gold-dark);
  border: 1px solid var(--border-gold);
}

.badge-navy {
  background: var(--navy);
  color: var(--white);
}

.badge-glass {
  background: var(--glass-white);
  color: var(--white);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(8px);
}

/* ─── Cards ─── */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--duration-base) var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.card-glass {
  background: var(--glass-white);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
}

.card-navy {
  background: var(--navy-mid);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.08);
}

/* ─── Grid System ─── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ─── Divider ─── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-200), transparent);
  border: none;
  margin: 0;
}

.divider-gold {
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ─── Backgrounds ─── */
.bg-navy    { background-color: var(--navy); }
.bg-navy-mid { background-color: var(--navy-mid); }
.bg-off-white { background-color: var(--off-white); }
.bg-cream   { background-color: var(--cream); }
.bg-gold    { background-color: var(--gold); }
.bg-dark    { background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%); }

.bg-navy-gradient {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-mid) 100%);
}

.bg-section-alt {
  background: var(--off-white);
}

/* ─── Scroll Reveal ─── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Delay utilities */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }
.delay-600 { transition-delay: 600ms; }
.delay-700 { transition-delay: 700ms; }
.delay-800 { transition-delay: 800ms; }

/* ─── Gold Line ─── */
.gold-line {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.gold-line--center {
  margin: 0 auto 24px;
}

/* ─── Page Hero ─── */
.page-hero {
  background: var(--bg-navy-gradient);
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, var(--navy-mid) 100%);
  padding: 160px 0 80px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 50%, rgba(212,175,55,0.08) 0%, transparent 60%),
                    radial-gradient(circle at 80% 20%, rgba(26,63,112,0.4) 0%, transparent 50%);
}

.page-hero__content {
  position: relative;
  z-index: 2;
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.page-hero__title em {
  color: var(--gold);
  font-style: italic;
}

.page-hero__sub {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 560px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.6);
  transition: color var(--duration-fast);
}

.breadcrumb a:hover { color: var(--gold); }
.breadcrumb span { color: var(--gold); }
.breadcrumb .sep { opacity: 0.4; }

/* ─── Decorative ─── */
.dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(212,175,55,0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-50); }
::-webkit-scrollbar-thumb { background: var(--navy-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold); }

/* ─── Selection ─── */
::selection {
  background: rgba(212,175,55,0.25);
  color: var(--navy);
}

/* ─── Focus ─── */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ─── Print ─── */
@media print {
  .no-print { display: none !important; }
}

/* ─── Responsive Breakpoints ─── */
@media (max-width: 1200px) {
  :root { --section-py: 80px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 992px) {
  :root { --section-py: 70px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --section-py: 56px; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .section-header { margin-bottom: 40px; }
  .container { padding: 0 20px; }
}

@media (max-width: 480px) {
  :root { --section-py: 48px; }
  .btn { padding: 13px 24px; font-size: 0.875rem; }
  .btn-lg { padding: 16px 28px; font-size: 0.9375rem; }
}