:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #06b6d4;
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-blue-tint: #eff6ff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-light: #e2e8f0;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-white);
  line-height: 1.5;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; margin-bottom: 1rem; }
h3 { font-size: 1.5rem; margin-bottom: 0.75rem; }

p { color: var(--text-muted); font-size: 1.125rem; }

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

section {
  padding: 80px 0;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  height: 72px;
  display: flex;
  align-items: center;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.logo-img {
  height: 32px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: white;
  color: var(--primary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--bg-light);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-icon {
  margin-right: 8px;
}

/* Hero Section */
.hero {
  padding: 100px 0 60px;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at top right, var(--bg-blue-tint), transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content h1 span {
  color: var(--primary);
}

.hero-subtext {
  margin: 24px 0 40px;
  font-size: 1.25rem;
  max-width: 540px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
}

.hero-image-container {
  position: relative;
}

.hero-main-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.mascot-float {
  position: absolute;
  top: -40px;
  right: -20px;
  width: 120px;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* Logo Ticker */
.ticker-section {
  padding: 40px 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  text-align: center;
}

.ticker-text {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.logo-grid {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: 40px;
  opacity: 0.6;
  filter: grayscale(1);
}

.ticker-logo {
  height: 30px;
  width: auto;
}

/* Features Grid */
.features-section {
  background-color: var(--bg-light);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: white;
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background-color: var(--bg-blue-tint);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

/* Learning Structure / Zones */
.zones-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.zone-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s;
}

.zone-card:hover {
  transform: scale(1.02);
}

.zone-image {
  height: 200px;
  background-color: #f1f5f9;
  position: relative;
  overflow: hidden;
}

.zone-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zone-content {
  padding: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.zone-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.tag-corporate { background: #e0f2fe; color: #0369a1; }
.tag-exam { background: #fef2f2; color: #991b1b; }
.tag-comm { background: #f0fdf4; color: #166534; }

.zone-cta {
  margin-top: auto;
  width: 100%;
}

.zone-cta.corporate { background-color: #0369a1; }
.zone-cta.exam { background-color: #991b1b; }
.zone-cta.comm { background-color: #166534; }

/* Feedback List */
.feedback-list {
  list-style: none;
  margin-top: 24px;
}

.feedback-list-item {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.feedback-list-item svg {
  stroke: var(--primary);
  flex-shrink: 0;
}

/* Stats Card Header/Footer */
.stats-header {
  margin-bottom: 24px;
}

.stats-footer {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.coach-tip-text {
  font-size: 0.9rem;
}

/* Flow Section */
.flow-container {
  display: flex;
  justify-content: space-between;
  position: relative;
}

.flow-container::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--border-light);
  z-index: 1;
}

.flow-step {
  position: relative;
  z-index: 2;
  text-align: center;
  flex: 1;
  padding: 0 20px;
}

.step-number {
  width: 80px;
  height: 80px;
  background: white;
  border: 4px solid var(--bg-blue-tint);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  margin: 0 auto 20px;
  box-shadow: var(--shadow-sm);
}

/* Feedback Section */
.feedback-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  background: var(--bg-blue-tint);
  border-radius: 32px;
  padding: 60px;
}

.stats-card {
  background: white;
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.stat-bar {
  height: 8px;
  background: var(--border-light);
  border-radius: 4px;
  flex-grow: 1;
  margin: 0 16px;
  overflow: hidden;
}

.stat-fill {
  height: 100%;
  background: var(--primary);
}

/* Footer */
.footer {
  background: var(--bg-light);
  padding: 80px 0 40px;
  border-top: 1px solid var(--border-light);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 60px;
  margin-bottom: 60px;
}

.footer-logo-desc p {
  margin-top: 20px;
  max-width: 300px;
}

.footer-links h4 {
  margin-bottom: 24px;
  font-size: 1rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 40px;
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Helpers */
.text-primary { color: var(--primary); }
.text-center { text-align: center; }