/*
  ======================================================
  MyChinese Academy — Design System
  Theme: Light Educational — Crimson & Gold (theo logo)
  ======================================================
*/

:root {
  --color-bg:            #FEFCF8;       /* trắng ấm — sạch hơn */
  --color-surface:       #FFFFFF;
  --color-surface-alt:   #FBF6EE;       /* kem nhạt xen kẽ */
  --color-primary:       #991B1B;       /* crimson tươi, rõ nét */
  --color-primary-light: #B91C1C;       /* hover sáng hơn */
  --color-primary-dark:  #7F1D1D;       /* dark variant */
  --color-accent:        #CA8A04;       /* gold đậm, sắc nét */
  --color-accent-hover:  #A16207;
  --color-accent-light:  #FEF3C7;       /* gold nhạt — highlight bg */
  --color-text:          #111827;       /* gần đen, clean */
  --color-text-muted:    #6B7280;       /* xám trung tính */
  --color-white:         #ffffff;
  --color-glass-bg:      rgba(255, 252, 248, 0.97);
  --color-glass-border:  rgba(153, 27, 27, 0.12);

  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body:    'Be Vietnam Pro', 'Inter', sans-serif;

  --shadow-card:   0 4px 24px rgba(153, 27, 27, 0.08);
  --shadow-raise:  0 12px 40px rgba(153, 27, 27, 0.13);
  --shadow-gold:   0 4px 20px rgba(202, 138, 4, 0.30);
  --shadow-glass:  var(--shadow-raise);
  --border-radius: 16px;
  --transition:    all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  padding-bottom: 2rem;
}

/* ── Decorative Orbs — rất nhẹ trên nền sáng ─────── */
.decor-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  z-index: 0;
  pointer-events: none;
}
.orb-1 { width:500px; height:500px; background:#B91C1C; top:-80px; right:-80px; opacity:0.10; }
.orb-2 { width:600px; height:600px; background:#CA8A04; bottom:10%; left:-200px; opacity:0.08; }
.orb-3 { width:350px; height:350px; background:#991B1B; top:45%; right:10%; opacity:0.06; }

/* ── Typography ──────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--color-text); font-weight: 700; }

/* ── Glass Card → white card trên nền sáng ──────── */
.glass-card {
  background: var(--color-surface);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-raise);
}

/* ── Header ──────────────────────────────────────── */
.main-header {
  padding: 1.2rem 5%;
  position: relative; z-index: 10;
  background: var(--color-surface);
  border-bottom: 1px solid rgba(92,18,18,0.08);
  box-shadow: 0 2px 12px rgba(92,18,18,0.06);
}
.header-container {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
}
.logo-area { display: flex; align-items: center; gap: 0.8rem; }
.brand-icon { font-size: 2rem; color: var(--color-primary); }
.brand-name { font-family: var(--font-heading); font-weight: 800; font-size: 1.6rem; color: var(--color-primary); }

.header-badge {
  background: linear-gradient(135deg, rgba(153,27,27,0.06), rgba(202,138,4,0.06));
  border: 1px solid rgba(153,27,27,0.18);
  padding: 0.45rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem; font-weight: 600;
  display: flex; align-items: center; gap: 0.6rem;
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(153,27,27,0.08);
}
.badge-dot {
  width: 8px; height: 8px;
  background-color: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(34,197,94,0.5);
  display: inline-block;
  animation: pulse 2s infinite;
}

/* ── Hero ────────────────────────────────────────── */
.hero-section {
  padding: 3rem 5% 5rem 5%; position: relative; z-index: 5;
  background: linear-gradient(160deg, #FFFAF4 0%, #FFF5E8 60%, #FEF0DC 100%);
}
.hero-container {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: 4rem; align-items: center;
}
.hero-content { display: flex; flex-direction: column; gap: 1.8rem; }
.hero-title { font-size: 3rem; line-height: 1.2; font-weight: 800; letter-spacing: -0.5px; }
.highlight {
  color: var(--color-primary-dark);
  background: var(--color-accent-light);
  padding: 2px 8px; border-radius: 6px;
  border-bottom: 2px solid var(--color-accent);
}
.hero-subtitle { font-size: 1.1rem; color: var(--color-text-muted); max-width: 580px; line-height: 1.7; }

/* Pillars */
.pillars-grid { display: flex; flex-direction: column; gap: 1rem; margin-top: 0.5rem; }
.pillar-card { display: flex; gap: 1rem; align-items: flex-start; }
.pillar-icon-wrapper {
  background: linear-gradient(135deg, rgba(153,27,27,0.08), rgba(202,138,4,0.08));
  border: 1.5px solid rgba(153,27,27,0.18);
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary); font-size: 1.25rem; flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(153,27,27,0.10);
}
.pillar-info h3 { font-size: 1.05rem; margin-bottom: 0.25rem; font-weight: 600; }
.pillar-info p { color: var(--color-text-muted); font-size: 0.92rem; }

/* Social proof */
.social-proof {
  display: flex; align-items: center; gap: 1.2rem;
  margin-top: 1rem; padding-top: 1.5rem;
  border-top: 1px solid rgba(92,18,18,0.1);
}
.avatar-group { display: flex; }
.proof-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(92,18,18,0.1);
  border: 2px solid var(--color-bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: var(--color-primary);
  margin-right: -10px;
}
.proof-text { font-size: 0.9rem; color: var(--color-text-muted); }

/* ── Form ────────────────────────────────────────── */
.form-card { padding: 2.5rem; position: relative; }
.form-header { margin-bottom: 2rem; text-align: center; }
.form-header h2 { font-size: 1.7rem; margin-bottom: 0.5rem; color: var(--color-primary); }
.form-header p { color: var(--color-text-muted); font-size: 0.92rem; }

.signup-form { display: flex; flex-direction: column; gap: 1.2rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label {
  font-size: 0.88rem; font-weight: 600; color: var(--color-text);
  display: flex; align-items: center; gap: 0.5rem;
}
.form-group label i { color: var(--color-primary); font-size: 0.9rem; }

.form-group input,
.form-group select,
.form-group textarea {
  background: #FBF8F4;
  border: 1.5px solid rgba(92,18,18,0.15);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
  width: 100%;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #B09888; }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(92,18,18,0.08);
  background: #FFFFFF;
}

/* Select wrapper */
.select-wrapper { position: relative; }
.select-wrapper select { appearance: none; -webkit-appearance: none; cursor: pointer; }
.select-wrapper::after {
  content: '\f107'; font-family: 'Font Awesome 6 Free'; font-weight: 900;
  position: absolute; right: 1rem; top: 50%; transform: translateY(-50%);
  color: var(--color-primary); pointer-events: none;
}

/* Buttons */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 60%, #DC2626 100%);
  color: #FFFFFF;
  border: none; border-radius: 10px; padding: 1rem 1.5rem;
  font-family: var(--font-heading); font-weight: 700; font-size: 1.05rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 0.8rem;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(153,27,27,0.30), 0 1px 0 rgba(255,255,255,0.15) inset;
  letter-spacing: 0.01em;
}
.btn-primary:hover {
  background: linear-gradient(135deg, #DC2626 0%, var(--color-primary-light) 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(153,27,27,0.40);
}
.btn-primary:active { transform: translateY(0); }
.btn-icon { transition: transform 0.3s ease; }
.btn-primary:hover .btn-icon { transform: translate(3px, -2px); }

.form-footer {
  text-align: center; margin-top: 1.2rem;
  color: var(--color-text-muted); font-size: 0.8rem;
}
.form-footer i { color: var(--color-primary); margin-right: 0.3rem; }

/* ── Section Common ──────────────────────────────── */
.section-title-wrapper { text-align: center; margin-bottom: 3rem; }
.section-tag {
  color: var(--color-primary); font-weight: 700;
  text-transform: uppercase; font-size: 0.78rem;
  letter-spacing: 2px; display: inline-block; margin-bottom: 0.5rem;
}
.section-title { font-size: 2.1rem; font-weight: 800; }
.section-subtitle { font-size: 1rem; color: var(--color-text-muted); margin-top: 0.6rem; }

/* ── Testimonials ────────────────────────────────── */
.testimonials-section {
  padding: 4rem 5%; max-width: 1200px;
  margin: 0 auto; position: relative; z-index: 5;
}
.testimonials-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.testimonial-card {
  background: var(--color-surface);
  border: 1px solid rgba(92,18,18,0.1);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card);
  padding: 2rem; display: flex;
  flex-direction: column; justify-content: space-between; gap: 1.2rem;
}
.stars { color: var(--color-accent); font-size: 0.9rem; }
.testimonial-text { font-size: 1rem; font-style: italic; color: var(--color-text); line-height: 1.65; }
.user-info { display: flex; align-items: center; gap: 1rem; }
.user-avatar {
  background: rgba(92,18,18,0.08);
  width: 42px; height: 42px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary); font-size: 1.1rem;
  border: 1px solid rgba(92,18,18,0.14);
}
.user-info h4 { font-size: 0.95rem; font-weight: 600; }
.user-info p { font-size: 0.82rem; color: var(--color-text-muted); }

/* ── Footer ──────────────────────────────────────── */
.main-footer {
  text-align: center; padding: 2.5rem 0; margin-top: 4rem;
  border-top: 1px solid rgba(92,18,18,0.1);
  font-size: 0.9rem; color: var(--color-text-muted);
  background: var(--color-surface);
}
.footer-container { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-sub { font-size: 0.75rem; opacity: 0.7; }

/* ── Animations ──────────────────────────────────── */
@keyframes pulse {
  0%   { transform:scale(0.95); box-shadow:0 0 0 0 rgba(34,197,94,0.6); }
  70%  { transform:scale(1);    box-shadow:0 0 0 8px rgba(34,197,94,0); }
  100% { transform:scale(0.95); box-shadow:0 0 0 0 rgba(34,197,94,0); }
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 968px) {
  .hero-container { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-title { font-size: 2.4rem; text-align: center; }
  .hero-subtitle { text-align: center; margin: 0 auto; }
  .social-proof { justify-content: center; }
  .testimonials-grid { grid-template-columns: 1fr; gap: 1.2rem; }
}
@media (max-width: 576px) {
  .hero-title { font-size: 2rem; }
  .form-card { padding: 1.5rem; }
  .main-header { padding: 1rem 5%; }
  .header-container { flex-direction: column; gap: 1rem; }
  .testimonial-card { padding: 1.5rem; }
}