/* ── Design Tokens ──────────────────────────────────────────────────── */
:root {
  --navy:   #1e3a5f;
  --coral:  #e05535;
  --amber:  #f5a823;
  --teal:   #1e8fa6;
  --light:  #faf8f5;
  --white:  #ffffff;
  --text:   #1a2035;
  --text-2: #4a5568;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(30, 58, 95, 0.08);
  --shadow-lg: 0 12px 40px rgba(30, 58, 95, 0.14);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
  --font-ta: 'Noto Serif Tamil', 'Noto Sans Tamil', Georgia, serif;
  --font-en: 'Inter', system-ui, sans-serif;
  --font-body: 'Noto Sans Tamil', 'Inter', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Tamil text gets the serif font */
[data-lang="ta"] h1, [data-lang="ta"] h2, [data-lang="ta"] h3,
[data-lang="ta"] .hero-headline, [data-lang="ta"] .program-name-ta {
  font-family: var(--font-ta);
}
[data-lang="en"] h1, [data-lang="en"] h2, [data-lang="en"] h3 {
  font-family: var(--font-en);
  font-weight: 700;
}

a { color: var(--teal); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--navy); }

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

ul { list-style: none; }

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Language Toggle ────────────────────────────────────────────────── */
[data-lang="en"] .t-ta { display: none; }
[data-lang="ta"] .t-en { display: none; }

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--coral);
  color: #fff;
  border-color: var(--coral);
}
.btn-primary:hover {
  background: #c94420;
  border-color: #c94420;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(224, 85, 53, 0.35);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  color: #fff;
}
.btn-sm { padding: 10px 20px; font-size: 0.875rem; }
.btn-full { width: 100%; justify-content: center; }

/* ── Sections ───────────────────────────────────────────────────────── */
.section { padding: 96px 0; }
.section-light { background: var(--light); }
.section-dark  { background: var(--navy); }
.section-navy  { background: #0f2240; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 14px;
}
.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--navy);
  line-height: 1.25;
  margin-bottom: 20px;
}
.section-intro {
  max-width: 680px;
  margin: 0 auto;
  color: var(--text-2);
  font-size: 1.05rem;
}

/* ── Navigation ─────────────────────────────────────────────────────── */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
#site-header.scrolled { box-shadow: var(--shadow); }

.nav-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  height: 70px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo img { height: 40px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  padding: 6px 12px;
  border-radius: 6px;
  transition: all var(--transition);
}
.nav-links a:hover { color: var(--navy); background: var(--light); }

.lang-toggle {
  background: var(--navy);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 8px 18px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  font-family: var(--font-body);
  white-space: nowrap;
}
.lang-toggle:hover { background: var(--teal); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── Hero ────────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(135deg, #0f2240 0%, #1e3a5f 50%, #1e5f74 100%);
  overflow: hidden;
  padding-top: 70px;
}

/* Decorative blobs */
#hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,168,35,0.12) 0%, transparent 70%);
  top: -100px; right: -100px;
  pointer-events: none;
}
#hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30,143,166,0.15) 0%, transparent 70%);
  bottom: -50px; left: -50px;
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 64px 24px;
}

.hero-eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.hero-headline {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero-sub {
  max-width: 680px;
  margin: 0 auto 40px;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: rgba(255,255,255,0.8);
  line-height: 1.8;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.6s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.8s forwards;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s ease 1s forwards;
}
.badge {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  backdrop-filter: blur(8px);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.4);
  font-size: 1.2rem;
  animation: bounce 2s infinite;
}

/* ── About ──────────────────────────────────────────────────────────── */
.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.about-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border-top: 4px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition);
}
.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.about-card--vision  { border-top-color: var(--amber); }
.about-card--mission { border-top-color: var(--coral); }
.about-card--values  { border-top-color: var(--teal);  }

.about-card-icon { font-size: 2rem; margin-bottom: 16px; }
.about-card h3 {
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 12px;
}
.about-card p { color: var(--text-2); font-size: 0.95rem; }

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.highlight-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-2);
}
.highlight-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--dot-color, var(--teal));
  flex-shrink: 0;
}

/* ── Stats ──────────────────────────────────────────────────────────── */
.section-stats {
  background: var(--navy);
  padding: 64px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat-item {
  text-align: center;
  padding: 32px 20px;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.stat-item:last-child { border-right: none; }
.stat-number {
  display: block;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--amber);
  line-height: 1.1;
  margin-bottom: 8px;
}
.stat-label {
  display: block;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
  font-weight: 500;
}

/* ── Work ───────────────────────────────────────────────────────────── */
.work-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  justify-content: center;
  flex-wrap: wrap;
}
.work-tab {
  padding: 10px 24px;
  border-radius: 50px;
  border: 2px solid var(--border);
  background: #fff;
  color: var(--text-2);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}
.work-tab:hover { border-color: var(--navy); color: var(--navy); }
.work-tab.active {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

.work-panel { display: none; }
.work-panel.active { display: block; }

.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.work-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border-left: 3px solid var(--teal);
}
.work-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.work-num {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.work-card h3 {
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.4;
}
.work-card p { font-size: 0.875rem; color: var(--text-2); }

/* ── Programs ───────────────────────────────────────────────────────── */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.program-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.program-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
  border-color: rgba(245,168,35,0.4);
}
.program-icon { font-size: 2.2rem; }
.program-name-ta {
  font-family: var(--font-ta);
  color: var(--amber);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.program-card h3 {
  font-size: 1rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 8px;
}
.program-card p { font-size: 0.875rem; color: rgba(255,255,255,0.65); }

/* ── Library ────────────────────────────────────────────────────────── */
.library-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 64px;
  align-items: center;
}

.library-content .section-label { margin-bottom: 14px; }
.library-content h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  color: var(--navy);
  margin-bottom: 16px;
}
.library-content > p { color: var(--text-2); margin-bottom: 32px; }

.library-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
}
.library-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-2);
}
.feature-icon {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.library-visual {}
.library-stat-card {
  background: var(--navy);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  color: #fff;
  box-shadow: var(--shadow-lg);
}
.library-stat {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.library-stat:last-of-type { border-bottom: none; }
.big-num {
  display: block;
  font-size: 3rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  margin-bottom: 6px;
}
.big-label { font-size: 0.9rem; color: rgba(255,255,255,0.7); }

.library-tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.library-tag {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.8);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ── Support ────────────────────────────────────────────────────────── */
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.support-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.support-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.support-card--featured {
  background: var(--navy);
  color: #fff;
  border: 2px solid var(--amber);
}
.support-card--featured h3 { color: #fff; }
.support-card--featured p  { color: rgba(255,255,255,0.75); }
.support-icon { font-size: 2rem; }
.support-card h3 { font-size: 1rem; color: var(--navy); }
.support-card p  { font-size: 0.875rem; color: var(--text-2); flex: 1; }

/* ── Contact ────────────────────────────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: 16px;
}
.contact-info > p { margin-bottom: 40px; }

.contact-details { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.contact-item a { color: var(--amber); }
.contact-item a:hover { color: var(--white); }
.contact-item strong { display: block; margin-bottom: 2px; }
.contact-social-note { margin-top: 32px; font-size: 0.875rem; }

.contact-form-wrap {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
}
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--navy);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: var(--font-body);
  color: var(--text);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(30, 143, 166, 0.12);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-success {
  color: #16a34a;
  font-size: 0.9rem;
  text-align: center;
  padding: 12px;
  background: #f0fdf4;
  border-radius: 8px;
  border: 1px solid #bbf7d0;
}

/* ── Footer ─────────────────────────────────────────────────────────── */
#site-footer {
  background: #081829;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo { height: 44px; width: auto; margin-bottom: 16px; }
.footer-tagline {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}
.footer-nav h4,
.footer-contact h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--amber); }
.footer-contact p { font-size: 0.875rem; margin-bottom: 8px; }
.footer-contact a { color: rgba(255,255,255,0.65); }
.footer-contact a:hover { color: var(--amber); }

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

/* ── Reveal Animation ───────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

@keyframes fadeUp {
  to { opacity: 1; transform: none; }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(-10px); }
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .library-layout { grid-template-columns: 1fr; }
  .library-visual { max-width: 520px; }
  .contact-layout { grid-template-columns: 1fr; }
  .contact-form-wrap { max-width: 560px; }
}

@media (max-width: 900px) {
  .about-cards { grid-template-columns: 1fr; }
  .about-highlights { grid-template-columns: 1fr; }
  .work-grid { grid-template-columns: repeat(2, 1fr); }
  .programs-grid { grid-template-columns: repeat(2, 1fr); }
  .support-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .stat-item:nth-child(even) { }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: fixed;
    top: 70px;
    left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--border);
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 8px;
  }
  .nav-hamburger { display: flex; }
  .lang-toggle { margin-left: 0; }

  .work-grid { grid-template-columns: 1fr; }
  .programs-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }

  .contact-form-wrap { padding: 28px 20px; }
  .hero-actions { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .about-cards { grid-template-columns: 1fr; }
}