/* ========================================
   THE AI CODING SCHOOL — Premium Tutoring Design
   Inspired by: Top 16 tutoring websites 
   Vibe: Warm, Welcoming, Trustworthy, Professional
   ======================================== */

:root {
  --bg: #ffffff;
  --bg-warm: #faf8f6;
  --bg-light: #f5f1ed;
  --accent-green: #22c55e;
  --accent-purple: #8b5cf6;
  --accent-blue: #3b82f6;
  --accent-warm: #f59e0b;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --radius: 20px;
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Fredoka', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== HEADER & NAV ========== */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--accent-green);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent-green);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: none;
}

.btn-primary {
  background: var(--accent-green);
  color: #fff;
  box-shadow: 0 8px 20px -4px rgba(34,197,94,0.35);
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 28px -4px rgba(34,197,94,0.45);
}

.btn-secondary {
  background: #f1f5f9;
  color: var(--text-primary);
  font-weight: 700;
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
  padding: 12px 26px;
}

.btn-ghost:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.btn-xl {
  padding: 16px 38px;
  font-size: 1.05rem;
}

/* ========== HERO ========== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 120px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.75) 40%, rgba(255,255,255,0.88) 100%),
    url('/images/hero-home.png') center/cover no-repeat;
}

.hero-center {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.85);
  color: var(--accent-green);
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 28px;
  border: 1px solid rgba(34, 197, 94, 0.2);
  backdrop-filter: blur(8px);
}

.hero-text h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-text h1 span {
  background: linear-gradient(135deg, var(--accent-green), #15803d);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text .subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-stats-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-stat-pill {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 12px 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.hero-stat-pill strong {
  color: var(--accent-green);
  font-weight: 800;
}

/* ========== TRUST BAR ========== */
.trust-bar {
  background: var(--bg-warm);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
}

.trust-bar-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

/* ========== SECTION HEADERS ========== */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-badge {
  display: inline-block;
  background: var(--bg-light);
  color: var(--accent-green);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}

.section-header h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========== PROGRAMS ========== */
.programs {
  padding: 100px 0;
  background: #fff;
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.program-card {
  border-radius: 24px;
  padding: 40px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.program-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.program-card.green {
  background: rgba(34, 197, 94, 0.05);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.program-card.green::before {
  background: var(--accent-green);
}

.program-card.purple {
  background: rgba(139, 92, 246, 0.05);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.program-card.purple::before {
  background: var(--accent-purple);
}

.program-card.blue {
  background: rgba(59, 130, 246, 0.05);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.program-card.blue::before {
  background: var(--accent-blue);
}

.program-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.06);
}

.program-age {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-light);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.program-card h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.program-card p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.program-card ul {
  list-style: none;
  margin-bottom: 28px;
  padding: 0;
}

.program-card li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}

.program-card li::before {
  content: '✓';
  margin-right: 8px;
  color: var(--accent-green);
  font-weight: 800;
}

/* ========== HOW IT WORKS ========== */
.how-it-works {
  padding: 100px 0;
  background: var(--bg-warm);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  align-items: center;
}

.step-card {
  background: #fff;
  border-radius: 20px;
  padding: 36px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.step-card:hover {
  box-shadow: 0 12px 30px rgba(0,0,0,0.06);
  transform: translateY(-4px);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--accent-green);
  color: #fff;
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 auto 20px;
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.step-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-green);
  font-weight: 800;
}

/* ========== SOCIAL PROOF ========== */
.social-proof {
  padding: 100px 0;
  background: #fff;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-warm);
  border-radius: 20px;
  padding: 32px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.06);
}

.testimonial-card .stars {
  color: var(--accent-warm);
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.testimonial-card blockquote {
  font-size: 1rem;
  color: var(--text-primary);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 20px;
  border-left: 4px solid var(--accent-green);
  padding-left: 16px;
}

.parent-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.parent-avatar {
  font-size: 2rem;
}

.parent-info strong {
  display: block;
  color: var(--text-primary);
  font-size: 0.95rem;
}

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

/* ========== FAQ ========== */
.faq-section {
  padding: 100px 0;
  background: var(--bg-warm);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: var(--accent-green);
  box-shadow: 0 8px 20px rgba(0,0,0,0.04);
}

.faq-item summary {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item summary::after {
  content: '+';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent-green);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  font-size: 1rem;
  transition: transform 0.3s ease;
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-item p {
  color: var(--text-secondary);
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ========== BOOKING ========== */
.cta-section {
  padding: 100px 0;
  background: linear-gradient(135deg, rgba(34,197,94,0.08) 0%, rgba(139,92,246,0.06) 100%);
}

.cta-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.cta-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-content > p {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.booking-container {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 32px;
  padding: 12px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.04);
  overflow: hidden;
}

.cta-email {
  margin-top: 32px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.cta-email a {
  color: var(--accent-green);
  text-decoration: none;
  font-weight: 600;
}

.cta-email a:hover {
  text-decoration: underline;
}

/* ========== FOOTER ========== */
footer {
  padding: 80px 0 40px;
  background: #fff;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-info {
  flex: 2;
  max-width: 400px;
}

.footer-info .logo {
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.footer-info p {
  color: var(--text-secondary);
}

.footer-links {
  flex: 3;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.link-group h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.link-group a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  margin-bottom: 12px;
  font-weight: 500;
  transition: color 0.2s;
}

.link-group a:hover {
  color: var(--accent-green);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border);
  padding-top: 28px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-center h1 {
    font-size: 2.2rem;
  }

  .nav-links {
    gap: 16px;
  }

  .nav-links a:not(.btn) {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .footer-grid {
    flex-direction: column;
    gap: 40px;
    text-align: center;
  }

  .footer-info {
    margin: 0 auto;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .trust-row {
    justify-content: flex-start;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .step-connector {
    transform: rotate(90deg);
  }
}

@media (max-width: 600px) {
  .program-grid {
    grid-template-columns: 1fr;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

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

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