/* ===================================================
   Polymer Raw Materials — Design System & Styles
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  --bg-primary: #F8F9FA;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;

  --text-primary: #0F2027;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --accent-pvc: #38EF7D;
  --accent-pe: #11998E;
  --accent-pp: #00F2FE;

  --accent-pvc-glow: rgba(56, 239, 125, 0.15);
  --accent-pe-glow: rgba(17, 153, 142, 0.15);
  --accent-pp-glow: rgba(0, 242, 254, 0.15);

  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-blur: 20px;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 40px;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul, ol {
  list-style: none;
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent-pe);
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent-pe);
  border-radius: 2px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ===================================================
   NAVIGATION
   =================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px 0;
  background: #ffffff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-pvc), var(--accent-pe));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-pe);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

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

.nav-cta {
  padding: 8px 20px !important;
  background: linear-gradient(135deg, var(--accent-pvc), var(--accent-pe)) !important;
  border-radius: var(--radius-sm) !important;
  color: white !important;
  font-weight: 600 !important;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast) !important;
}

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

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-pvc-glow);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===================================================
   HERO SECTION
   =================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 110px; /* Accounts for the new thicker navbar */
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-pvc-glow) 0%, transparent 70%);
  animation: float 12s ease-in-out infinite;
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-pe-glow) 0%, transparent 70%);
  animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* Particle canvas */
#particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--accent-pe);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -2px;
  margin-bottom: 24px;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent-pvc) 0%, var(--accent-pe) 50%, var(--accent-pp) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 40px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--accent-pvc), var(--accent-pe));
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-pvc-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Hero scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.scroll-indicator .mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 3px;
  animation: scroll-down 1.8s ease-in-out infinite;
}

@keyframes scroll-down {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ===================================================
   STATS BAR
   =================================================== */
.stats-bar {
  padding: 60px 0;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  background: var(--bg-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

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

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-pe), var(--accent-pvc));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================================
   INTRO SECTION
   =================================================== */
.intro {
  padding: 120px 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.intro-text .section-description {
  margin-bottom: 32px;
}

.intro-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.intro-feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.intro-feature .feature-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.intro-feature h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.intro-feature p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.intro-visual {
  position: relative;
}

.intro-visual .molecule-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  backdrop-filter: blur(var(--glass-blur));
  position: relative;
  overflow: hidden;
}

.intro-visual .molecule-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--accent-pvc-glow) 0%, transparent 70%);
  pointer-events: none;
}

.molecule-card .formula-display {
  font-size: 4rem;
  font-weight: 900;
  text-align: center;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--accent-pvc), var(--accent-pe), var(--accent-pp));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.molecule-card .chain-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-bottom: 32px;
}

.molecule-card .chain-visual .atom {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: atom-pulse 2s ease-in-out infinite;
}

.molecule-card .chain-visual .atom:nth-child(odd) {
  background: var(--accent-pvc);
}

.molecule-card .chain-visual .atom:nth-child(even) {
  background: var(--accent-pe);
  animation-delay: 0.3s;
}

.molecule-card .chain-visual .bond {
  width: 16px;
  height: 3px;
  background: var(--glass-border);
  border-radius: 2px;
}

@keyframes atom-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.8; }
}

.molecule-card .type-labels {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.molecule-card .type-label {
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
}

.type-label.pvc {
  background: rgba(108, 99, 255, 0.15);
  color: var(--accent-pvc);
  border: 1px solid rgba(108, 99, 255, 0.3);
}

.type-label.pe {
  background: rgba(0, 201, 167, 0.15);
  color: var(--accent-pe);
  border: 1px solid rgba(0, 201, 167, 0.3);
}

.type-label.pp {
  background: rgba(255, 107, 107, 0.15);
  color: var(--accent-pp);
  border: 1px solid rgba(255, 107, 107, 0.3);
}

/* ===================================================
   MATERIALS SECTION
   =================================================== */
.materials {
  padding: 120px 0;
}

.materials-header {
  text-align: center;
  margin-bottom: 80px;
}

.materials-header .section-description {
  margin: 0 auto;
}

.materials-grid {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

/* Individual Material Card */
.material-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 48px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(var(--glass-blur));
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.material-card::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  pointer-events: none;
  transition: opacity var(--transition-slow);
  opacity: 0.5;
}

.material-card:hover::before {
  opacity: 0.8;
}

.material-card.pvc-card::before {
  background: radial-gradient(circle, var(--accent-pvc-glow) 0%, transparent 70%);
}
.material-card.pvc-card:hover {
  border-color: rgba(108, 99, 255, 0.2);
  box-shadow: 0 0 80px rgba(108, 99, 255, 0.08);
}

.material-card.pe-card::before {
  background: radial-gradient(circle, var(--accent-pe-glow) 0%, transparent 70%);
}
.material-card.pe-card:hover {
  border-color: rgba(0, 201, 167, 0.2);
  box-shadow: 0 0 80px rgba(0, 201, 167, 0.08);
}

.material-card.pp-card::before {
  background: radial-gradient(circle, var(--accent-pp-glow) 0%, transparent 70%);
}
.material-card.pp-card:hover {
  border-color: rgba(255, 107, 107, 0.2);
  box-shadow: 0 0 80px rgba(255, 107, 107, 0.08);
}

.material-card:nth-child(even) {
  direction: rtl;
}

.material-card:nth-child(even) > * {
  direction: ltr;
}

.material-info {
  display: flex;
  flex-direction: column;
}

.material-abbr {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.pvc-card .material-abbr { color: var(--accent-pvc); }
.pe-card .material-abbr { color: var(--accent-pe); }
.pp-card .material-abbr { color: var(--accent-pp); }

.material-name {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.material-formula {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 24px;
  font-style: italic;
}

.material-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 28px;
}

.material-props {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.prop-item {
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
}

.prop-item .prop-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.prop-item .prop-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.material-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.material-tags .tag {
  padding: 6px 14px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 100px;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.pvc-card .tag:hover {
  background: rgba(108, 99, 255, 0.1);
  border-color: rgba(108, 99, 255, 0.3);
  color: var(--accent-pvc);
}

.pe-card .tag:hover {
  background: rgba(0, 201, 167, 0.1);
  border-color: rgba(0, 201, 167, 0.3);
  color: var(--accent-pe);
}

.pp-card .tag:hover {
  background: rgba(255, 107, 107, 0.1);
  border-color: rgba(255, 107, 107, 0.3);
  color: var(--accent-pp);
}

/* Material Image */
.material-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/3;
}

.material-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.material-card:hover .material-visual img {
  transform: scale(1.04);
}

.material-visual .overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(255, 255, 255, 0.6) 0%, transparent 50%);
  pointer-events: none;
}

/* ===================================================
   COMPARISON TABLE
   =================================================== */
.comparison {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.comparison-header {
  text-align: center;
  margin-bottom: 60px;
}

.comparison-header .section-description {
  margin: 0 auto;
}

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

.comparison-table thead th {
  padding: 20px 24px;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.03);
}

.comparison-table thead th:first-child {
  border-top-left-radius: var(--radius-lg);
}

.comparison-table thead th:last-child {
  border-top-right-radius: var(--radius-lg);
}

.comparison-table thead th.pvc-col { color: var(--accent-pvc); }
.comparison-table thead th.pe-col { color: var(--accent-pe); }
.comparison-table thead th.pp-col { color: var(--accent-pp); }

.comparison-table tbody tr {
  transition: background var(--transition-fast);
}

.comparison-table tbody tr:hover {
  background: rgba(0, 0, 0, 0.02);
}

.comparison-table tbody td {
  padding: 18px 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.comparison-table tbody td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===================================================
   APPLICATIONS SECTION
   =================================================== */
.applications {
  padding: 120px 0;
}

.applications-header {
  text-align: center;
  margin-bottom: 60px;
}

.applications-header .section-description {
  margin: 0 auto;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.app-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
  transition: transform var(--transition-base);
}

.app-card:hover {
  transform: translateY(-8px);
}

.app-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.app-card:hover img {
  transform: scale(1.08);
}

.app-card .app-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 255, 255, 0.6) 40%,
    transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 28px;
}

.app-card .app-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.app-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.app-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.app-card .app-polymers {
  display: flex;
  gap: 6px;
  margin-top: 12px;
}

.app-card .polymer-badge {
  padding: 3px 10px;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 100px;
  letter-spacing: 1px;
}

.polymer-badge.pvc-badge {
  background: rgba(108, 99, 255, 0.2);
  color: var(--accent-pvc);
}

.polymer-badge.pe-badge {
  background: rgba(0, 201, 167, 0.2);
  color: var(--accent-pe);
}

.polymer-badge.pp-badge {
  background: rgba(255, 107, 107, 0.2);
  color: var(--accent-pp);
}

/* ===================================================
   FOOTER
   =================================================== */
.footer {
  padding: 80px 0 40px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand .footer-logo {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col ul a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-col ul a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-bottom .social-links {
  display: flex;
  gap: 16px;
}

.footer-bottom .social-link {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.footer-bottom .social-link:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 1024px) {
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .material-card {
    grid-template-columns: 1fr;
    padding: 32px;
  }

  .material-card:nth-child(even) {
    direction: ltr;
  }

  .apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    z-index: 999;
    padding-top: 80px; /* Spacing for the close button / logo */
  }

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

  .nav-links a {
    font-size: 1.25rem;
  }

  .hamburger {
    display: flex;
    z-index: 1001;
  }

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

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

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

  .hero h1 {
    font-size: 2.2rem;
    letter-spacing: -1px;
    margin-top: 20px;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .material-props {
    grid-template-columns: 1fr;
  }

  .apps-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .scroll-indicator {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    justify-content: center;
    width: 100%;
  }

  .section-title {
    font-size: 1.8rem;
  }
}