/* =====================================================
   THAY CO CHAT LUONG – Project 4
   Style: Professional, Authoritative, Dark Blue + Gold
   Mobile-first Responsive CSS
   ===================================================== */

/* ---- CSS Variables ---- */
:root {
  --primary: #2c5282;
  --primary-dark: #1a365d;
  --primary-mid: #2b6cb0;
  --primary-light: #4a7ab5;

  --accent: #d4af37;
  --accent-dark: #b8960c;
  --accent-light: #e8c84a;
  --accent-pale: rgba(212, 175, 55, 0.12);

  --navy: #1a365d;
  --teal: #234e70;
  --gold: #d4af37;

  --text-dark: #1a202c;
  --text-medium: #4a5568;
  --text-light: #718096;
  --text-muted: #a0aec0;

  --bg-white: #ffffff;
  --bg-light: #f7f8fc;
  --bg-cream: #fefdf9;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.16);
  --shadow-navy: 0 8px 32px rgba(44, 82, 130, 0.25);
  --shadow-gold: 0 8px 32px rgba(212, 175, 55, 0.3);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition: all 0.3s ease;
  --transition-fast: all 0.2s ease;

  --container-max: 1200px;
  --section-padding: 80px 0;
}

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

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

body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  line-height: 1.3;
  font-weight: 700;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

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

ul { list-style: none; }

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

input, select, textarea {
  font-family: 'Roboto', sans-serif;
}

/* ---- Container ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Utility ---- */
.accent-gold { color: var(--accent); }
.accent-navy { color: var(--primary); }
.bg-cream { background-color: var(--bg-cream); }

.section {
  padding: var(--section-padding);
}

/* ---- Section Header ---- */
.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 4px;
  margin-bottom: 16px;
}

.section-tag.light {
  color: var(--accent-light);
  border-bottom-color: var(--accent-light);
}

.section-header h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  margin-bottom: 16px;
  color: var(--text-dark);
}

.section-header p {
  font-size: 1rem;
  color: var(--text-medium);
  line-height: 1.8;
}

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--primary-dark);
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  font-family: 'Montserrat', sans-serif;
  transition: var(--transition);
  box-shadow: var(--shadow-gold);
  border: none;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(212, 175, 55, 0.4);
  color: var(--primary-dark);
}

.btn-primary.btn-lg {
  padding: 16px 36px;
  font-size: 0.95rem;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: rgba(255, 255, 255, 0.9);
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  font-family: 'Montserrat', sans-serif;
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: var(--transition);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

.btn-outline.btn-lg {
  padding: 16px 36px;
  font-size: 0.95rem;
}

/* ---- Fixed CTA Button ---- */
.fixed-cta {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--primary-dark);
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.88rem;
  font-family: 'Montserrat', sans-serif;
  box-shadow: var(--shadow-gold);
  z-index: 900;
  transition: var(--transition);
}

.fixed-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(212, 175, 55, 0.45);
  color: var(--primary-dark);
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 90px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  font-size: 0.85rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* =====================================================
   NAVIGATION
   ===================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(26, 54, 93, 0.98);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.25);
  padding: 12px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Montserrat', sans-serif;
  font-size: 1.15rem;
  color: #fff;
  font-weight: 600;
}

.logo i {
  font-size: 1.4rem;
  color: var(--accent);
}

.logo strong {
  font-weight: 800;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
  font-size: 0.88rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  font-family: 'Roboto', sans-serif;
}

.nav-link:hover {
  color: var(--accent-light);
  background: rgba(212, 175, 55, 0.1);
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: var(--primary-dark) !important;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  font-family: 'Montserrat', sans-serif;
  transition: var(--transition);
}

.btn-nav:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =====================================================
   HERO SECTION
   ===================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(160deg, var(--primary-dark) 0%, var(--primary) 50%, var(--teal) 100%);
  display: flex;
  align-items: center;
  padding: 100px 0 80px;
  overflow: hidden;
}

/* Decorative pattern */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 50%, rgba(212, 175, 55, 0.06) 0%, transparent 60%),
    radial-gradient(circle at 90% 20%, rgba(255, 255, 255, 0.04) 0%, transparent 50%);
}

/* Gold line accent */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M0 0h80v80H0V0zm20 20v40h40V20H20zm20 35a15 15 0 1 1 0-30 15 15 0 0 1 0 30z' /%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

/* Credential Bar */
.hero-credential-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hero-credential-bar span {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-credential-bar span i {
  color: var(--accent);
}

.hero-credential-bar .divider {
  color: rgba(255, 255, 255, 0.3);
  font-size: 1rem;
}

/* Hero Heading */
.hero-text h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  color: #fff;
  margin-bottom: 20px;
  line-height: 1.25;
}

.hero-sub {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
  line-height: 1.8;
  border-left: 3px solid var(--accent);
  padding-left: 16px;
}

/* Hero Bullets */
.hero-bullets {
  margin-bottom: 36px;
}

.hero-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.92rem;
  margin-bottom: 12px;
  line-height: 1.6;
}

.hero-bullets li i {
  color: var(--accent);
  font-size: 0.95rem;
  margin-top: 3px;
  flex-shrink: 0;
}

/* Hero CTA */
.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 44px;
}

/* Achievement Bar */
.hero-achievement-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.achievement-item {
  text-align: center;
  padding: 0 12px;
}

.ach-number {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-light);
  font-family: 'Montserrat', sans-serif;
  line-height: 1.2;
}

.ach-label {
  display: block;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.65);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 3px;
}

.ach-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
}

/* Hero Image */
.hero-image {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-img-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 2px solid rgba(212, 175, 55, 0.3);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(212, 175, 55, 0.1);
}

.hero-img-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(26, 54, 93, 0.5) 100%);
  z-index: 1;
  pointer-events: none;
}

.hero-img-frame img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  display: block;
}

/* Certificate Badges */
.hero-cert-badges {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.25);
  border-radius: var(--radius);
  padding: 14px 18px;
  transition: var(--transition);
}

.cert-badge:hover {
  background: rgba(212, 175, 55, 0.12);
  border-color: rgba(212, 175, 55, 0.4);
}

.cert-badge i {
  font-size: 1.6rem;
  color: var(--accent);
  flex-shrink: 0;
}

.cert-badge strong {
  display: block;
  font-size: 0.88rem;
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
}

.cert-badge span {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.65);
}

/* Hero Wave */
.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.hero-wave svg {
  width: 100%;
  height: 100px;
  display: block;
}

/* =====================================================
   PAIN POINTS
   ===================================================== */
.pain-points {
  background: var(--bg-white);
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.pain-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
}

.pain-card:hover {
  border-color: rgba(44, 82, 130, 0.2);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.pain-icon {
  width: 54px;
  height: 54px;
  background: var(--accent-pale);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.3rem;
  color: var(--accent-dark);
}

.pain-card h3 {
  font-size: 0.97rem;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
}

.pain-card p {
  font-size: 0.88rem;
  color: var(--text-medium);
  line-height: 1.7;
}

/* =====================================================
   SOLUTIONS
   ===================================================== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.solution-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid #e2e8f0;
  transition: var(--transition);
  border-top: 3px solid transparent;
}

.solution-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
  border-top-color: var(--accent);
}

.solution-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.icon-primary { background: rgba(44, 82, 130, 0.1); color: var(--primary); }
.icon-gold { background: var(--accent-pale); color: var(--accent-dark); }
.icon-success { background: rgba(39, 174, 96, 0.1); color: #27ae60; }
.icon-info { background: rgba(52, 152, 219, 0.1); color: #3498db; }
.icon-warning { background: rgba(230, 126, 34, 0.1); color: #e67e22; }

.solution-card h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
}

.solution-card p {
  font-size: 0.88rem;
  color: var(--text-medium);
  line-height: 1.7;
}

/* =====================================================
   BENEFITS
   ===================================================== */
.benefits {
  background: linear-gradient(160deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  padding: var(--section-padding);
}

.benefits .section-tag {
  color: var(--accent-light);
  border-bottom-color: var(--accent-light);
}

.benefits-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.benefits-text h2 {
  color: #fff;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 28px;
}

.benefits-list {
  margin-bottom: 36px;
}

.benefits-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.93rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.benefit-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-pale);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  color: var(--accent-light);
  flex-shrink: 0;
}

/* Results Showcase */
.benefits-visual {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.results-showcase {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.results-showcase h3 {
  font-size: 1rem;
  color: var(--accent-light);
  margin-bottom: 24px;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.result-bars {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-bar-item {}

.bar-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.85rem;
}

.bar-label span {
  color: rgba(255, 255, 255, 0.8);
}

.bar-pct {
  font-weight: 700;
  color: var(--accent-light) !important;
  font-family: 'Montserrat', sans-serif;
}

.bar-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-light) 100%);
  border-radius: var(--radius-full);
  width: 0;
  transition: width 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.benefits-visual > img {
  border-radius: var(--radius-lg);
  width: 100%;
  height: 260px;
  object-fit: cover;
  border: 1px solid rgba(212, 175, 55, 0.2);
  box-shadow: var(--shadow-md);
}

/* =====================================================
   TEACHERS
   ===================================================== */
.teachers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.teacher-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid #e2e8f0;
  transition: var(--transition);
}

.teacher-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-6px);
  border-color: rgba(44, 82, 130, 0.15);
}

.teacher-img-wrap {
  position: relative;
}

.teacher-img-wrap img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  filter: grayscale(15%);
  transition: var(--transition);
}

.teacher-card:hover .teacher-img-wrap img {
  filter: grayscale(0%);
}

.teacher-exp-badge {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: var(--accent);
  color: var(--primary-dark);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
}

.teacher-exp-badge.gold {
  background: #fff;
  color: var(--accent-dark);
  border: 1px solid var(--accent);
}

/* Gold accent top border */
.teacher-body {
  padding: 24px;
  border-top: 3px solid var(--accent);
}

.teacher-body h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
}

.teacher-degree {
  font-size: 0.8rem;
  color: var(--text-medium);
  margin-bottom: 10px;
}

.teacher-rating {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.stars { color: var(--accent); font-size: 0.85rem; letter-spacing: 1px; }
.rating-num { font-weight: 700; color: var(--text-dark); font-size: 0.9rem; }
.review-count { font-size: 0.75rem; color: var(--text-light); }

/* Teacher Stats Row */
.teacher-stats-row {
  display: flex;
  gap: 16px;
  margin-bottom: 14px;
  padding: 12px 0;
  border-top: 1px solid #f0f4f8;
  border-bottom: 1px solid #f0f4f8;
}

.t-stat {
  flex: 1;
  text-align: center;
}

.t-stat strong {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'Montserrat', sans-serif;
}

.t-stat span {
  font-size: 0.72rem;
  color: var(--text-light);
}

.teacher-quote {
  font-size: 0.8rem;
  font-style: italic;
  color: var(--text-medium);
  margin-bottom: 18px;
  line-height: 1.6;
  border-left: 2px solid var(--accent-pale);
  padding-left: 10px;
}

.btn-teacher {
  display: block;
  text-align: center;
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.82rem;
  font-family: 'Montserrat', sans-serif;
  transition: var(--transition);
}

.btn-teacher:hover {
  background: var(--primary);
  color: #fff;
}

/* =====================================================
   SUBJECTS
   ===================================================== */
.subjects {
  background: var(--bg-white);
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.subject-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  cursor: default;
}

.subject-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.subject-icon {
  width: 58px;
  height: 58px;
  background: rgba(44, 82, 130, 0.07);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary-mid);
  margin: 0 auto 16px;
  transition: var(--transition);
}

.subject-card:hover .subject-icon {
  background: var(--primary);
  color: #fff;
}

.subject-icon.gold {
  background: var(--accent-pale);
  color: var(--accent-dark);
}

.subject-card:hover .subject-icon.gold {
  background: var(--accent);
  color: var(--primary-dark);
}

.subject-card h4 {
  font-size: 0.92rem;
  margin-bottom: 8px;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
}

.subject-card p {
  font-size: 0.78rem;
  color: var(--text-medium);
  margin-bottom: 14px;
  line-height: 1.6;
}

.subject-level {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.level-exam { background: rgba(44, 82, 130, 0.1); color: var(--primary); }
.level-advanced { background: var(--accent-pale); color: var(--accent-dark); }
.level-ielts { background: rgba(39, 174, 96, 0.1); color: #1a6b3c; }
.level-combo { background: rgba(142, 68, 173, 0.1); color: #7d3c98; }

/* =====================================================
   TESTIMONIALS
   ===================================================== */
.testimonials-wrapper {
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: 28px;
}

.testimonials-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.testimonial-card {
  width: calc(33.333% - 16px);
  min-width: 0;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid #e2e8f0;
  transition: var(--transition);
  flex-shrink: 0;
  border-top: 3px solid var(--accent);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}

.testi-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.testi-header img {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 2px solid var(--accent);
  flex-shrink: 0;
}

.testi-info strong {
  display: block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
  margin-bottom: 2px;
}

.testi-info span {
  display: block;
  font-size: 0.75rem;
  color: var(--text-medium);
  margin-bottom: 8px;
}

.testi-score {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.score-tag {
  background: rgba(44, 82, 130, 0.08);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 500;
}

.score-tag strong {
  font-family: 'Montserrat', sans-serif;
}

.testi-stars {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testi-text {
  font-size: 0.88rem;
  color: var(--text-medium);
  line-height: 1.8;
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding-left: 14px;
}

/* Slider Controls */
.slider-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 8px;
}

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--primary);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  transition: var(--transition-fast);
}

.slider-btn:hover {
  background: var(--primary);
  color: #fff;
}

.slider-dots {
  display: flex;
  gap: 8px;
}

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-sm);
  background: rgba(44, 82, 130, 0.2);
  transition: var(--transition-fast);
  cursor: pointer;
}

.slider-dot.active {
  background: var(--accent);
  width: 28px;
}

/* =====================================================
   HOW IT WORKS
   ===================================================== */
.how-it-works {
  background: var(--bg-white);
}

.steps-container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 48px;
}

.step-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  flex: 1;
  min-width: 200px;
  max-width: 240px;
  transition: var(--transition);
  position: relative;
}

.step-card:hover {
  border-color: rgba(212, 175, 55, 0.4);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.step-card:hover .step-icon-wrap {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
}

.step-number {
  font-size: 2.8rem;
  font-weight: 900;
  color: rgba(44, 82, 130, 0.07);
  font-family: 'Montserrat', sans-serif;
  line-height: 1;
  margin-bottom: 8px;
}

.step-icon-wrap {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-mid) 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-navy);
  transition: var(--transition);
}

.step-card h3 {
  font-size: 0.95rem;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-family: 'Montserrat', sans-serif;
}

.step-card p {
  font-size: 0.83rem;
  color: var(--text-medium);
  line-height: 1.7;
}

.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--accent);
  padding: 0 4px;
  margin-top: 80px;
  flex-shrink: 0;
}

.steps-cta {
  text-align: center;
}

/* =====================================================
   PRICING
   ===================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  margin-bottom: 28px;
}

.pricing-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid #e2e8f0;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.pricing-card.featured-price {
  border: 2px solid var(--accent);
  transform: scale(1.02);
  box-shadow: var(--shadow-gold);
}

.pricing-card.featured-price:hover {
  transform: scale(1.02) translateY(-5px);
  box-shadow: 0 20px 56px rgba(212, 175, 55, 0.25);
}

.price-popular-badge.gold-badge {
  background: linear-gradient(90deg, var(--accent-dark) 0%, var(--accent) 100%);
  color: var(--primary-dark);
  text-align: center;
  padding: 9px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 0.5px;
}

.pricing-header {
  padding: 28px 28px 24px;
  color: #fff;
}

.pricing-header.level-basic {
  background: linear-gradient(135deg, var(--teal) 0%, var(--primary) 100%);
}

.pricing-header.level-advanced {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.pricing-header.level-elite {
  background: linear-gradient(135deg, var(--accent-dark) 0%, #8b6914 100%);
}

.pricing-header h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: #fff;
  font-family: 'Montserrat', sans-serif;
}

.price-display { margin-bottom: 8px; }

.price-amount {
  font-size: 1.8rem;
  font-weight: 900;
  font-family: 'Montserrat', sans-serif;
}

.price-unit {
  font-size: 0.85rem;
  opacity: 0.85;
  margin-left: 4px;
}

.price-desc { font-size: 0.8rem; opacity: 0.85; margin-top: 6px; }

.pricing-list {
  padding: 24px 28px;
}

.pricing-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text-medium);
  padding: 8px 0;
  border-bottom: 1px solid #f0f4f8;
  line-height: 1.5;
}

.pricing-list li:last-child { border-bottom: none; }

.pricing-list li i {
  color: #27ae60;
  font-size: 0.82rem;
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-list li.disabled {
  opacity: 0.35;
}

.pricing-list li.disabled i {
  color: var(--text-muted);
}

.btn-price {
  display: block;
  text-align: center;
  margin: 0 28px 28px;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  font-family: 'Montserrat', sans-serif;
  border: 1px solid var(--primary);
  color: var(--primary);
  transition: var(--transition);
}

.btn-price:hover {
  background: var(--primary);
  color: #fff;
}

.btn-price.featured-btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--primary-dark);
  border-color: transparent;
}

.btn-price.featured-btn:hover {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
  transform: translateY(-1px);
}

.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-medium);
  padding: 20px;
  background: var(--accent-pale);
  border-radius: var(--radius);
  border: 1px solid rgba(212, 175, 55, 0.2);
}

.pricing-note i {
  color: var(--accent-dark);
  margin-right: 6px;
}

.pricing-note a {
  color: var(--primary);
  font-weight: 700;
}

/* =====================================================
   FAQ
   ===================================================== */
.faq {
  background: var(--bg-white);
}

.faq-wrapper {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  background: #fff;
  transition: var(--transition);
}

.faq-item:hover,
.faq-item.active {
  border-color: rgba(44, 82, 130, 0.25);
  box-shadow: var(--shadow-sm);
}

.faq-item.active {
  border-left: 3px solid var(--accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 22px;
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  background: none;
  cursor: pointer;
  gap: 16px;
  font-family: 'Montserrat', sans-serif;
  transition: var(--transition-fast);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: rgba(44, 82, 130, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  color: var(--primary);
  flex-shrink: 0;
  transition: var(--transition-fast);
}

.faq-item.active .faq-icon {
  background: var(--accent);
  color: var(--primary-dark);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.2s ease;
}

.faq-answer.open {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 22px 20px;
  font-size: 0.87rem;
  color: var(--text-medium);
  line-height: 1.8;
}

.faq-answer strong {
  color: var(--primary);
}

/* =====================================================
   CONTACT
   ===================================================== */
.contact {
  background: linear-gradient(160deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  padding: var(--section-padding);
  position: relative;
}

.contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: flex-start;
}

.contact-info h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: #fff;
  margin-bottom: 16px;
  font-family: 'Montserrat', sans-serif;
}

.contact-info p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 28px;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* Guarantee Box */
.guarantee-box {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 28px;
}

.guarantee-box i {
  font-size: 1.8rem;
  color: var(--accent);
  flex-shrink: 0;
}

.guarantee-box strong {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-light);
  font-family: 'Montserrat', sans-serif;
  margin-bottom: 4px;
}

.guarantee-box p {
  font-size: 0.83rem;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
  line-height: 1.6;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-channel {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(255, 255, 255, 0.07);
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: var(--transition);
  color: #fff;
}

.contact-channel:hover {
  background: rgba(212, 175, 55, 0.12);
  border-color: rgba(212, 175, 55, 0.3);
  transform: translateX(4px);
  color: #fff;
}

.channel-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  color: var(--accent);
}

.channel-icon.gold-ch { background: var(--accent-pale); color: var(--accent); }
.channel-icon.blue-fb { background: rgba(59, 89, 152, 0.3); color: #fff; }

.channel-info strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 2px;
  font-family: 'Montserrat', sans-serif;
}

.channel-info span {
  font-size: 0.78rem;
  opacity: 0.75;
}

/* Contact Form */
.contact-form-wrap {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.contact-form-wrap::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-dark), var(--accent-light));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.contact-form-wrap h3 {
  font-size: 1.2rem;
  color: var(--text-dark);
  margin-bottom: 28px;
  text-align: center;
  font-family: 'Montserrat', sans-serif;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-family: 'Montserrat', sans-serif;
}

.required { color: #e74c3c; }

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-dark);
  background: #fff;
  transition: var(--transition-fast);
  outline: none;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: #e74c3c;
}

.form-error {
  font-size: 0.75rem;
  color: #e74c3c;
  display: block;
  min-height: 16px;
}

.form-group textarea {
  resize: vertical;
  min-height: 90px;
}

.btn-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 28px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-submit:hover {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

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

/* Form Success */
.form-success {
  text-align: center;
  padding: 40px 24px;
  animation: fadeInUp 0.5s ease;
}

.form-success i {
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

.form-success h4 {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: 10px;
  font-family: 'Montserrat', sans-serif;
}

.form-success p {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
}

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

/* =====================================================
   FOOTER
   ===================================================== */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding: 64px 0 0;
  border-top: 3px solid var(--accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand .logo-white {
  color: #fff;
  margin-bottom: 16px;
  display: inline-flex;
}

.footer-brand p {
  font-size: 0.87rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.65);
}

.social-links {
  display: flex;
  gap: 10px;
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  transition: var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link:hover {
  background: var(--accent);
  color: var(--primary-dark);
  border-color: var(--accent);
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 18px;
  font-family: 'Montserrat', sans-serif;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--accent-light);
  padding-left: 4px;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
}

.contact-list li i {
  color: var(--accent);
  margin-top: 3px;
  width: 14px;
  flex-shrink: 0;
}

.contact-list li a {
  color: rgba(255, 255, 255, 0.6);
}

.contact-list li a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 1024px) {
  :root { --section-padding: 64px 0; }
  .hero-content { gap: 44px; }
  .benefits-inner { gap: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --section-padding: 52px 0; }

  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    bottom: 0;
    width: 280px;
    background: var(--primary-dark);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 28px 40px;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.3);
    transition: right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 999;
  }

  .nav-links.open { right: 0; }

  .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1rem;
    width: 100%;
    padding: 12px 0;
  }

  .btn-nav {
    width: 100%;
    text-align: center;
    justify-content: center;
    margin-top: 16px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-text { order: 2; }
  .hero-image { order: 1; }

  .hero-cta-group { justify-content: center; }
  .hero-bullets li { text-align: left; }
  .hero-achievement-bar { justify-content: center; }
  .hero-sub { text-align: left; }

  .hero-img-frame img { height: 280px; }

  .hero-cert-badges { display: none; }

  .benefits-inner { grid-template-columns: 1fr; gap: 40px; }

  .contact-wrapper { grid-template-columns: 1fr; gap: 40px; }
  .contact-form-wrap { padding: 28px 24px; }

  .steps-container { flex-direction: column; align-items: center; }
  .step-card { max-width: 100%; width: 100%; }
  .step-arrow { transform: rotate(90deg); margin-top: 0; }

  .testimonial-card { width: calc(100% - 8px); }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 8px; }
}

@media (max-width: 480px) {
  :root { --section-padding: 40px 0; }
  .container { padding: 0 16px; }
  .form-row { grid-template-columns: 1fr; }

  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.featured-price { transform: none; }
  .pricing-card.featured-price:hover { transform: translateY(-5px); }

  .subjects-grid { grid-template-columns: repeat(2, 1fr); }
  .teachers-grid { grid-template-columns: 1fr; }
  .pain-grid { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr; }

  .hero-achievement-bar { flex-direction: column; gap: 0; }
  .ach-divider { width: 100%; height: 1px; }

  .fixed-cta span { display: none; }
  .fixed-cta {
    width: 52px;
    height: 52px;
    padding: 0;
    justify-content: center;
    border-radius: var(--radius-sm);
  }

  .back-to-top { bottom: 80px; right: 16px; }
}

@media (max-width: 360px) {
  .subjects-grid { grid-template-columns: 1fr; }
  .hero-cta-group { flex-direction: column; }
  .btn-outline.btn-lg, .btn-primary.btn-lg { width: 100%; justify-content: center; }
}