/* =============================================
   HUI CHUN GONG - Main Stylesheet
   Dark Theme, Elegant, Responsive
   ============================================= */

/* --- CSS Variables --- */
:root {
  --bg-dark: #2a2d3a;
  --bg-card: #353849;
  --bg-card-hover: #3e4258;
  --bg-input: #444860;
  --accent: #c9a84c;
  --accent-hover: #d4b85c;
  --accent-light: rgba(201, 168, 76, 0.15);
  --text-primary: #e8e6e1;
  --text-secondary: #9a9a9a;
  --text-muted: #666;
  --border: #2a2d3a;
  --success: #4caf50;
  --error: #e74c3c;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --nav-height: 70px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--accent-hover);
}

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

/* --- Senior Mode --- */
body.senior-mode {
  font-size: 20px;
}

body.senior-mode .btn,
body.senior-mode button {
  min-height: 52px;
  font-size: 18px;
}

body.senior-mode .nav-links a {
  font-size: 18px;
}

body.senior-mode h1 { font-size: 3rem; }
body.senior-mode h2 { font-size: 2.2rem; }
body.senior-mode h3 { font-size: 1.5rem; }

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.3rem; }

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  margin-bottom: 0.5rem;
}

.section-title .subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.gold-text {
  color: var(--accent);
}

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

section {
  padding: 80px 0;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(15, 17, 23, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

.senior-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
}

.senior-toggle:hover,
.senior-toggle.active {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 168, 76, 0.3);
}

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

.btn-secondary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}

.btn-small {
  padding: 8px 20px;
  font-size: 0.9rem;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  transition: var(--transition);
}

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

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(201, 168, 76, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  max-width: 700px;
}

.hero-tagline {
  color: var(--accent);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  margin-bottom: 2rem;
  max-width: 550px;
}

.hero-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

/* --- Benefits / Wirkung Section --- */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}

.benefit-card {
  text-align: center;
  padding: 40px 25px;
}

.benefit-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.benefit-card h3 {
  margin-bottom: 0.8rem;
  color: var(--accent);
}

.benefit-card p {
  color: var(--text-secondary);
}

/* --- Exercises Preview --- */
.exercises-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.exercise-preview-card {
  padding: 25px;
  cursor: default;
}

.exercise-number {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.exercise-preview-card h3 {
  margin-bottom: 4px;
}

.exercise-chinese {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

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

/* --- Testimonials --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.testimonial-card {
  padding: 30px;
}

.testimonial-text {
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.1rem;
}

.testimonial-name {
  font-weight: 600;
}

.testimonial-role {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* --- FAQ Section --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  padding: 20px 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

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

.faq-question .faq-icon {
  font-size: 1.3rem;
  transition: transform 0.3s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

/* --- Blog Section --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.blog-card {
  overflow: hidden;
}

.blog-card-image {
  height: 180px;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-radius: var(--radius) var(--radius) 0 0;
}

.blog-card-body {
  padding: 25px;
}

.blog-card-date {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.blog-card h3 {
  margin-bottom: 10px;
}

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

/* --- Newsletter Section --- */
.newsletter-section {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.newsletter-content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-content h2 {
  margin-bottom: 0.5rem;
}

.newsletter-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.newsletter-form {
  display: flex;
  gap: 10px;
}

.newsletter-form input {
  flex: 1;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 1rem;
}

.newsletter-form input::placeholder {
  color: var(--text-muted);
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.newsletter-message {
  margin-top: 10px;
  font-size: 0.9rem;
}

/* --- Footer --- */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  margin-bottom: 15px;
}

.footer-links a {
  color: var(--text-secondary);
  margin: 0 15px;
}

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

/* --- Login Page --- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  max-width: 420px;
  width: 100%;
  padding: 40px;
}

.login-card h1 {
  text-align: center;
  margin-bottom: 0.5rem;
  font-size: 1.8rem;
}

.login-card .login-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 1rem;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.login-error {
  color: var(--error);
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 1rem;
  display: none;
}

.login-card .btn {
  width: 100%;
  margin-top: 0.5rem;
}

.login-footer {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- Kurs-Bereich --- */
.kurs-layout {
  min-height: 100vh;
  padding-top: var(--nav-height);
}

/* Sidebar */
.kurs-sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  padding: 20px 0;
  overflow-y: auto;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  bottom: 0;
  width: 280px;
}

.sidebar-header {
  padding: 0 20px 15px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}

.sidebar-header h3 {
  font-size: 1rem;
  color: var(--accent);
}

.progress-bar-container {
  margin-top: 10px;
  background: var(--bg-input);
  border-radius: 10px;
  height: 8px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 10px;
  transition: width 0.5s ease;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 5px;
}

.sidebar-exercises {
  list-style: none;
}

.sidebar-exercise {
  padding: 12px 20px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.sidebar-exercise:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.sidebar-exercise.active {
  border-left-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.sidebar-exercise.bonus {
  background: linear-gradient(90deg, var(--accent-light), transparent);
  font-weight: 600;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}

.sidebar-exercise .check-icon {
  color: var(--success);
  font-size: 0.85rem;
  min-width: 16px;
}

/* Main content */
.kurs-main {
  margin-left: 280px;
  padding: 30px 50px;
}

.exercise-header {
  margin-bottom: 30px;
}

.exercise-header h1 {
  font-size: 1.8rem;
  margin-bottom: 5px;
}

.exercise-chinese {
  display: inline;
}

.exercise-meta {
  display: flex;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 10px;
}

.exercise-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Video player area */
.video-container {
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
  overflow: hidden;
  position: relative;
}

/* Eigener Resize-Handle (unten rechts) */
.video-resize-handle {
  position: absolute;
  bottom: 6px;
  right: 6px;
  width: 32px;
  height: 32px;
  cursor: nwse-resize;
  z-index: 20;
  background: linear-gradient(135deg, transparent 40%, var(--accent) 40%, var(--accent) 50%, transparent 50%, transparent 60%, var(--accent) 60%, var(--accent) 70%, transparent 70%, transparent 80%, var(--accent) 80%, var(--accent) 90%, transparent 90%);
  opacity: 0.85;
  border-radius: var(--radius-sm);
}
.video-resize-handle:hover {
  opacity: 1;
}

.video-container.landscape { aspect-ratio: 16 / 9; }
.video-container .rotate-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}
.video-container .rotate-wrap video {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: center center;
  object-fit: contain;
  background: #000;
}
.video-container .rotate-wrap video.rot-0,
.video-container .rotate-wrap video.rot-180 {
  width: 100%;
  height: 100%;
}
.video-container .rotate-wrap video.rot-0 {
  transform: translate(-50%, -50%);
}
.video-container .rotate-wrap video.rot-180 {
  transform: translate(-50%, -50%) rotate(180deg);
}

/* Bei 90/270°: Video-Größe = vertauschte Container-Größe */
.video-container.portrait .rotate-wrap video.rot-90,
.video-container.portrait .rotate-wrap video.rot-270 {
  width: calc(100% * 16 / 9);
  height: calc(100% * 9 / 16);
}
.video-container.landscape .rotate-wrap video.rot-90,
.video-container.landscape .rotate-wrap video.rot-270 {
  width: calc(100% * 9 / 16);
  height: calc(100% * 16 / 9);
}
.video-container.square .rotate-wrap video.rot-90,
.video-container.square .rotate-wrap video.rot-270 {
  width: 100%;
  height: 100%;
}
.video-container .rotate-wrap video.rot-90 {
  transform: translate(-50%, -50%) rotate(90deg);
}
.video-container .rotate-wrap video.rot-270 {
  transform: translate(-50%, -50%) rotate(-90deg);
}
.video-container.portrait {
  aspect-ratio: 9 / 16;
  max-width: 450px;
  margin-left: auto;
  margin-right: auto;
}
.video-container.square {
  aspect-ratio: 1 / 1;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.video-placeholder {
  text-align: center;
  color: var(--text-muted);
}

.video-placeholder .play-icon {
  font-size: 3rem;
  margin-bottom: 10px;
  color: var(--accent);
}

.video-placeholder p {
  font-size: 0.95rem;
}

.video-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Exercise details */
.exercise-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  margin-bottom: 30px;
}

.detail-card {
  padding: 25px;
}

.detail-card h3 {
  color: var(--accent);
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.detail-card ul {
  list-style: none;
}

.detail-card ul li {
  color: var(--text-secondary);
  padding: 4px 0;
  padding-left: 18px;
  position: relative;
}

.detail-card ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Alternative Videos */
.alt-videos {
  margin-top: 20px;
  margin-bottom: 25px;
}
.alt-videos h4 {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 12px;
  font-weight: 500;
}
.alt-videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.alt-video-thumb {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}
.alt-video-thumb:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.alt-video-thumb.active {
  border-color: var(--accent);
  border-width: 2px;
}
.alt-video-thumb video,
.alt-video-thumb img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  background: #000;
  display: block;
}
.alt-video-thumb .thumb-label {
  padding: 8px 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-card);
}
.alt-video-thumb .thumb-play {
  position: absolute;
  top: 35px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent);
  font-size: 2rem;
  pointer-events: none;
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
}

.mark-seen-btn {
  margin-bottom: 30px;
}

.mark-seen-btn.seen {
  background: var(--success);
  color: white;
}

/* Workbook */
.workbook-section {
  margin-bottom: 30px;
}

.workbook-card {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 20px;
}

.workbook-card.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.workbook-icon {
  font-size: 2rem;
}

.workbook-info h4 {
  margin-bottom: 4px;
}

.workbook-info p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Tabs (Kommentare / Fragen) */
.tabs {
  margin-top: 20px;
}

.tab-buttons {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 12px 24px;
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.comment-form,
.question-form {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.comment-form textarea,
.question-form textarea {
  flex: 1;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.95rem;
  resize: vertical;
  min-height: 60px;
  font-family: inherit;
}

.comment-form textarea:focus,
.question-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.comment-item,
.question-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 15px;
  margin-bottom: 10px;
}

.comment-meta,
.question-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 0.85rem;
}

.comment-author,
.question-author {
  color: var(--accent);
  font-weight: 600;
}

.comment-date,
.question-date {
  color: var(--text-muted);
}

.comment-text,
.question-text {
  color: var(--text-secondary);
}

.no-items {
  color: var(--text-muted);
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
}

/* --- Landingpage specific --- */
.landing-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.landing-hero h1 {
  font-size: 3.2rem;
  margin-bottom: 1.5rem;
  max-width: 800px;
}

.landing-hero p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.landing-price {
  text-align: center;
  padding: 60px 0;
}

.price-card {
  max-width: 450px;
  margin: 0 auto;
  padding: 40px;
  text-align: center;
  border-color: var(--accent);
}

.price-amount {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  margin: 20px 0;
}

.price-note {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.price-features {
  list-style: none;
  margin: 25px 0;
  text-align: left;
}

.price-features li {
  padding: 8px 0;
  color: var(--text-secondary);
  padding-left: 25px;
  position: relative;
}

.price-features li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

/* --- Sidebar toggle (mobile) --- */
.sidebar-toggle-btn {
  display: none;
  position: fixed;
  bottom: 20px;
  left: 20px;
  z-index: 999;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-dark);
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: var(--shadow);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  section { padding: 50px 0; }

  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .newsletter-form {
    flex-direction: column;
  }

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

  /* Kurs responsive */
  .kurs-layout {
    grid-template-columns: 1fr;
  }

  .kurs-sidebar {
    display: none;
    width: 100%;
    position: fixed;
    z-index: 998;
  }

  .kurs-sidebar.open {
    display: block;
  }

  .kurs-main {
    margin-left: 0;
    padding: 20px 15px;
  }

  .exercise-details {
    grid-template-columns: 1fr;
  }

  .sidebar-toggle-btn {
    display: block;
  }

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

  .comment-form,
  .question-form {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .benefits-grid { grid-template-columns: 1fr; }
  .exercises-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
}