/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  /* 主色调 - 物理学科深蓝 */
  --primary-dark: #0a1929;
  --primary-blue: #0d47a1;
  --accent-cyan: #00d4ff;
  --accent-amber: #ffb800;
  
  /* 中性色 */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.8);
  --text-muted: rgba(255, 255, 255, 0.6);
  
  /* 背景色 */
  --bg-dark: #050d1a;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  
  /* 边框 */
  --border-light: rgba(255, 255, 255, 0.1);
  --border-accent: rgba(0, 212, 255, 0.3);
  
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 粒子背景画布 */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   Layout
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-tag {
  display: inline-block;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
  opacity: 0.8;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 13, 26, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-base);
}

.navbar.scrolled {
  background: rgba(5, 13, 26, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--accent-cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: var(--transition-base);
}

.nav-link:hover {
  color: var(--accent-cyan);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  background: linear-gradient(135deg, var(--accent-cyan), var(--primary-blue));
  color: var(--text-primary) !important;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.hero-content {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-cyan);
  margin-bottom: var(--spacing-md);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: var(--radius-xl);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--primary-blue));
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

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

.btn-outline:hover {
  background: var(--bg-card);
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
}

.btn-full {
  width: 100%;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--accent-cyan);
  display: inline-block;
}

.stat-suffix {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--accent-cyan);
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--border-accent);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 2px;
  animation: scrollDown 1.5s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { top: 8px; opacity: 1; }
  100% { top: 24px; opacity: 0; }
}

/* ========================================
   About Section
   ======================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about-image-wrapper {
  position: relative;
  aspect-ratio: 1;
  max-width: 400px;
  margin: 0 auto;
}

.about-avatar {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
}

.avatar-placeholder {
  width: 80%;
  height: 80%;
  color: var(--text-primary);
}

.avatar-placeholder svg {
  width: 100%;
  height: 100%;
}

.about-decoration {
  position: absolute;
  border-radius: var(--radius-lg);
  z-index: 1;
}

.dec-1 {
  top: -20px;
  right: -20px;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-cyan), transparent);
  opacity: 0.3;
}

.dec-2 {
  bottom: -20px;
  left: -20px;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-amber), transparent);
  opacity: 0.2;
}

.about-name {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.about-role {
  color: var(--accent-cyan);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
}

.about-text {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-highlights {
  display: grid;
  gap: var(--spacing-sm);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: var(--transition-base);
}

.highlight-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateX(8px);
}

.highlight-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.highlight-item strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.highlight-item span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   Philosophy Section
   ======================================== */
.philosophy {
  background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.03), transparent);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.philosophy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.philosophy-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-amber));
  transform: scaleX(0);
  transition: var(--transition-base);
}

.philosophy-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.philosophy-card:hover::before {
  transform: scaleX(1);
}

.philosophy-number {
  font-family: 'Orbitron', sans-serif;
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent-cyan);
  opacity: 0.2;
  margin-bottom: var(--spacing-sm);
}

.philosophy-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.philosophy-card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========================================
   Features Section
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  transition: var(--transition-base);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-sm);
  color: var(--accent-cyan);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* ========================================
   Courses Section
   ======================================== */
.courses {
  background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.03), transparent);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.course-card.featured {
  border-color: var(--accent-cyan);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(13, 71, 161, 0.05));
}

.course-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: linear-gradient(135deg, var(--accent-amber), #ff8c00);
  color: var(--primary-dark);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  font-weight: 700;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-accent);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.course-level {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

.course-grade {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.course-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.course-desc {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

.course-list {
  list-style: none;
  margin-bottom: var(--spacing-sm);
}

.course-list li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.course-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.course-footer {
  display: flex;
  gap: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--border-light);
}

.course-info {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   Achievements Section
   ======================================== */
.achievements-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.achievement-stat {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
}

.achievement-stat:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-4px);
}

.achievement-number {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--accent-cyan);
  display: inline-block;
}

.achievement-suffix {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--accent-cyan);
}

.achievement-label {
  display: block;
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: var(--transition-base);
}

.testimonial-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-4px);
}

.testimonial-stars {
  color: var(--accent-amber);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.testimonial-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--primary-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.testimonial-author strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.testimonial-author span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.03), transparent);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.contact-info {
  display: grid;
  gap: var(--spacing-sm);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.contact-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateX(8px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--primary-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
}

.contact-item strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.contact-item span {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
}

.contact-form h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  background: var(--bg-dark);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group select {
  cursor: pointer;
}

.form-group select option {
  background: var(--bg-dark);
  color: var(--text-primary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.footer-text {
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-base);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

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

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .about-image-wrapper {
    max-width: 300px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 4rem;
    --spacing-lg: 3rem;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(5, 13, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-base);
    border-bottom: 1px solid var(--border-light);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero-stats {
    gap: var(--spacing-md);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .philosophy-grid,
  .features-grid,
  .courses-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .achievements-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .achievements-stats {
    grid-template-columns: 1fr;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}