@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swap');

:root {
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --bg-primary: #dff5f2;
  --bg-secondary: #cfeee9;
  --bg-card: #e8f8f5;
  --bg-card-hover: #d7f1ec;

  --surface-primary: #e8f8f5;
  --surface-secondary: #d4f1ec;
  --surface-strong: #bfe9e3;

  --border-color: #9fd8d1;
  --border-color-hover: #6fc8bd;

  --text-primary: #173f3c;
  --text-secondary: #3f6f6b;
  --text-muted: #6f9691;

  --accent-primary: #58b7af;
  --accent-primary-hover: #4da8a1;
  --accent-secondary: #7ed7cf;

  --m1-color: #8b5cf6;
  --m2-color: #58b7af;
  --m3-color: #3b82f6;

  --shadow-sm: 0 2px 6px rgba(23, 63, 60, 0.08);
  --shadow-md: 0 8px 18px rgba(23, 63, 60, 0.12);
  --shadow-lg: 0 16px 34px rgba(23, 63, 60, 0.14);

  --transition-smooth: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  background: var(--bg-primary);
}

body::before {
  content: '';
  position: absolute;
  top: -12%;
  left: -12%;
  width: 45vw;
  height: 45vw;
  background: rgba(126, 215, 207, 0.28);
  z-index: -1;
  pointer-events: none;
  border-radius: 50%;
}

body::after {
  content: '';
  position: absolute;
  top: 48%;
  right: -10%;
  width: 40vw;
  height: 40vw;
  background: rgba(88, 183, 175, 0.18);
  z-index: -1;
  pointer-events: none;
  border-radius: 50%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
}

p {
  line-height: 1.6;
  color: var(--text-secondary);
}

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

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

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

header.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4rem;
  background: rgba(207, 238, 233, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-smooth);
}

header.site-header.scrolled {
  height: 60px;
  background: rgba(191, 233, 227, 0.96);
  box-shadow: var(--shadow-md);
}

.logo a {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-primary);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 10px rgba(88, 183, 175, 0.7);
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 2.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 5px 0;
  transition: var(--transition-smooth);
}

/* ==========================================================================
   HERO / HOME
   ========================================================================== */

section.hero-section {
  padding: 8rem 4rem 4rem 4rem;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
}

.hero-tag {
  background: var(--surface-strong);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  max-width: 950px;
  margin-bottom: 1.5rem;
  line-height: 1.15;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
  margin-bottom: 3rem;
}

.meta-item {
  background: var(--surface-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.meta-item strong {
  color: var(--text-primary);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

/* Solid color button, no gradient */
.btn-primary {
  background: var(--accent-primary);
  color: white !important;
  border: none;
  box-shadow: 0 4px 14px rgba(88, 183, 175, 0.28);
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(88, 183, 175, 0.34);
  color: white !important;
}

/* Solid pastel secondary button */
.btn-secondary {
  background: var(--surface-strong);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #aee1da;
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

/* Hero Image */
.hero-image-container {
  width: 100%;
  max-width: 700px;
  margin: 2.5rem auto;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.hero-image-container:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.hero-project-image {
  width: 100%;
  height: auto;
  display: block;
}

/* Home features */
.home-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 3.5rem auto 0 auto;
  padding: 0 1rem;
}

.home-feature-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  border-radius: 12px;
  text-align: center;
  transition: var(--transition-smooth);
}

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

/* ==========================================================================
   MODULES SECTION
   ========================================================================== */

section.modules-section {
  padding: 6rem 4rem;
  background: var(--bg-secondary);
  position: relative;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-desc {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1rem;
}

.modules-container {
  display: flex;
  flex-direction: column;
  gap: 6rem;
  max-width: 1200px;
  margin: 0 auto;
}

.module-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: stretch;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: var(--transition-smooth);
  overflow: hidden;
}

.module-card:hover {
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-lg);
}

.module-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  border-radius: 20px 0 0 20px;
}

.module-card.m1::after {
  background: var(--m1-color);
}

.module-card.m2::after {
  background: var(--m2-color);
}

.module-card.m3::after {
  background: var(--m3-color);
}

.module-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.module-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.m1 .module-badge {
  background: rgba(139, 92, 246, 0.12);
  color: #6d3bd6;
}

.m2 .module-badge {
  background: rgba(88, 183, 175, 0.18);
  color: #2f7770;
}

.m3 .module-badge {
  background: rgba(59, 130, 246, 0.12);
  color: #2563eb;
}

.module-number {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.module-title {
  font-size: 2rem;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.module-concept {
  background: var(--surface-secondary);
  border-left: 3px solid var(--accent-primary);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  border-radius: 0 8px 8px 0;
}

.m1 .module-concept {
  border-color: var(--m1-color);
}

.m2 .module-concept {
  border-color: var(--m2-color);
}

.m3 .module-concept {
  border-color: var(--m3-color);
}

.module-concept-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-primary);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.module-concept-body {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.module-desc {
  margin-bottom: 1.5rem;
  font-size: 0.98rem;
  line-height: 1.6;
}

.module-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
  list-style: none;
}

.module-specs li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.module-specs li::before {
  content: '✓';
  font-weight: bold;
}

.m1 .module-specs li::before {
  color: var(--m1-color);
}

.m2 .module-specs li::before {
  color: var(--m2-color);
}

.m3 .module-specs li::before {
  color: var(--m3-color);
}

/* ==========================================================================
   MODULE VISUAL TABS
   ========================================================================== */

.module-visual-container {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--surface-primary);
  overflow: hidden;
  height: 400px;
}

.visual-tabs {
  display: flex;
  background: var(--surface-secondary);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  background: var(--surface-secondary);
  border: none;
  padding: 0.85rem;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: #bee7e1;
}

.tab-btn.active {
  color: var(--text-primary);
  background: #a7ddd5;
}

/* This makes the 3D CAD Viewer button stand out */
.tab-btn[data-tab$="-3d"] {
  background: #7ed7cf;
  color: #0f3d3a;
  font-weight: 900;
  letter-spacing: 0.01em;
  border-left: 1px solid #6cc8c0;
}

.tab-btn[data-tab$="-3d"]:hover {
  background: #67c9c0;
  color: #083331;
}

.tab-btn[data-tab$="-3d"].active {
  background: #4fb8af;
  color: white;
}

.m1 .tab-btn.active {
  border-bottom: 2px solid var(--m1-color);
}

.m2 .tab-btn.active {
  border-bottom: 2px solid var(--m2-color);
}

.m3 .tab-btn.active {
  border-bottom: 2px solid var(--m3-color);
}

.tab-content {
  flex: 1;
  position: relative;
  display: none;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   PHOTOS
   ========================================================================== */

.photo-panel {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.preview-image:hover {
  transform: scale(1.03);
}

/* ==========================================================================
   STL / 3D VIEWER
   ========================================================================== */

.stl-panel {
  width: 100%;
  height: 100%;
  position: relative;
  background: #dff5f2;
}

.stl-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.stl-dropzone {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(216, 244, 240, 0.92);
  border: 2px dashed var(--border-color);
  border-radius: 0 0 12px 12px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  z-index: 10;
}

.stl-dropzone.dragover,
.stl-dropzone:hover {
  border-color: var(--accent-primary);
  background: #c9eee9;
}

.stl-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  transition: var(--transition-smooth);
  color: var(--accent-primary);
}

.stl-dropzone:hover .stl-icon {
  transform: translateY(-3px);
}

.stl-dropzone p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 250px;
  margin-bottom: 1rem;
}

.stl-viewer-controls {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: #bfe9e3;
  padding: 0.4rem 1rem;
  border-radius: 30px;
  display: flex;
  gap: 0.8rem;
  align-items: center;
  font-size: 0.75rem;
  border: 1px solid var(--border-color);
  pointer-events: auto;
  z-index: 20;
}

.stl-control-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
  font-weight: 700;
}

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

.stl-loading-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 15;
}

.spinner {
  width: 30px;
  height: 30px;
  border: 3px solid rgba(88, 183, 175, 0.2);
  border-radius: 50%;
  border-top-color: var(--accent-primary);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.stl-loading-spinner span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* STL Download */
.stl-download-container {
  padding: 0.8rem 1rem;
  display: flex;
  justify-content: center;
  background: var(--surface-secondary);
  border-top: 1px solid var(--border-color);
  border-radius: 0 0 12px 12px;
  z-index: 5;
}

.download-stl-btn {
  font-size: 0.8rem !important;
  padding: 0.5rem 1.2rem !important;
  border-radius: 6px !important;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  text-transform: none;
  letter-spacing: normal;
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */

section.about-section {
  padding: 6rem 4rem;
  background: var(--bg-primary);
}

.about-intro-card {
  max-width: 1000px;
  margin: 0 auto 4rem auto;
  text-align: center;
  padding: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
}

.about-intro-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.authors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto 4rem auto;
}

.author-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

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

.author-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: var(--surface-strong);
  margin: 0 auto 1.5rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  transition: var(--transition-smooth);
}

.author-card:hover .author-avatar {
  border-color: var(--accent-primary);
  background: var(--accent-primary);
  color: white;
}

.author-name {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.author-role {
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 800;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.author-bio {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.author-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.author-link-btn {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition-smooth);
}

.author-link-btn:hover {
  color: var(--accent-primary);
}

.affiliation-info {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.affiliation-info h4 {
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

footer.site-footer {
  background: var(--bg-secondary);
  padding: 4rem 4rem 2rem 4rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-left h4 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-citation {
  background: var(--surface-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  font-family: monospace;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-secondary);
  word-break: break-all;
}

.footer-right {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-end;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-license {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  text-align: right;
  color: var(--text-secondary);
}

.footer-license img {
  height: 25px;
  opacity: 0.85;
  border-radius: 3px;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
}

/* ==========================================================================
   IMAGE MODAL VIEWER
   ========================================================================== */

.modal-viewer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(23, 63, 60, 0.92);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-viewer.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  max-width: 90%;
  max-height: 85%;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 25px 50px rgba(23, 63, 60, 0.35);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal-viewer.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 2.5rem;
  color: rgba(255, 255, 255, 0.75);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close:hover {
  color: white;
}

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

@media (max-width: 1024px) {
  header.site-header {
    padding: 0 2rem;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .module-card {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem;
  }

  .module-visual-container {
    height: 350px;
    grid-row: 1;
  }
}

@media (max-width: 768px) {
  header.site-header {
    padding: 0 1.5rem;
  }

  .menu-toggle {
    display: block;
    z-index: 1010;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    gap: 3rem;
    padding: 2rem;
    border-left: 1px solid var(--border-color);
    transition: right 0.4s ease;
    z-index: 1005;
  }

  .nav-menu.active {
    right: 0;
  }

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

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

  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }

  section.hero-section {
    padding: 7rem 1.5rem 3rem 1.5rem;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .hero-meta {
    flex-direction: column;
    gap: 0.8rem;
  }

  section.modules-section {
    padding: 4rem 1.5rem;
  }

  section.about-section {
    padding: 4rem 1.5rem;
  }

  .module-card {
    padding: 2rem;
  }

  .module-specs {
    grid-template-columns: 1fr;
  }

  .visual-tabs {
    flex-direction: column;
  }

  .tab-btn[data-tab$="-3d"] {
    border-left: none;
    border-top: 1px solid #6cc8c0;
  }

  footer.site-footer {
    padding: 4rem 1.5rem 2rem 1.5rem;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .footer-right {
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.9rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .module-title {
    font-size: 1.6rem;
  }

  .module-visual-container {
    height: 300px;
  }
}