/* ============================================
   元沣智能 - 企业官网设计系统
   ============================================ */

/* ---- CSS Variables ---- */
:root {
  /* Colors - Dark Tech Theme */
  --c-bg: #060B14;
  --c-bg-2: #0A1424;
  --c-bg-3: #0E1B30;
  --c-surface: rgba(255, 255, 255, 0.03);
  --c-surface-hover: rgba(255, 255, 255, 0.06);
  --c-border: rgba(255, 255, 255, 0.08);
  --c-border-hover: rgba(0, 212, 255, 0.3);

  --c-cyan: #00D4FF;
  --c-cyan-dim: rgba(0, 212, 255, 0.15);
  --c-blue: #2B7FFF;
  --c-purple: #8B5CF6;
  --c-teal: #14B8A6;

  --c-text: #E8EEF7;
  --c-text-2: #A0AEC0;
  --c-text-3: #64748B;
  --c-white: #FFFFFF;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #00D4FF 0%, #2B7FFF 50%, #8B5CF6 100%);
  --grad-cyan: linear-gradient(135deg, #00D4FF 0%, #2B7FFF 100%);
  --grad-purple: linear-gradient(135deg, #8B5CF6 0%, #2B7FFF 100%);
  --grad-teal: linear-gradient(135deg, #14B8A6 0%, #00D4FF 100%);
  --grad-text: linear-gradient(135deg, #00D4FF 0%, #2B7FFF 100%);
  --grad-bg-radial: radial-gradient(ellipse at top, rgba(0, 212, 255, 0.08) 0%, transparent 60%);

  /* Typography */
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --container: 1200px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --t-fast: 0.2s ease;
  --t-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--t-fast);
}

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

ul, ol {
  list-style: none;
}

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

.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.section-sm {
  padding: var(--space-lg) 0;
}

.text-center { text-align: center; }
.text-cyan { color: var(--c-cyan); }
.text-blue { color: var(--c-blue); }

/* ---- Section Header ---- */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-lg);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--c-cyan-dim);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-cyan);
  margin-bottom: 1.25rem;
  letter-spacing: 0.05em;
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--c-cyan);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--c-text-2);
  line-height: 1.8;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--t-base);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary {
  background: var(--grad-cyan);
  color: var(--c-bg);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-outline:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: var(--c-cyan-dim);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1rem;
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.8125rem;
}

/* ---- Navigation ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--t-base);
}

.navbar.scrolled {
  padding: 12px 0;
  background: rgba(6, 11, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-white);
}

.nav-logo .logo-img {
  width: 42px;
  height: 42px;
  display: block;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.25));
  transition: transform 0.3s ease;
}

.nav-logo:hover .logo-img {
  transform: rotate(-5deg) scale(1.05);
}

.nav-logo .logo-img-footer {
  width: 48px;
  height: 48px;
}

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-logo .logo-text .name {
  font-size: 1rem;
  font-weight: 700;
}

.nav-logo .logo-text .en {
  font-size: 0.6875rem;
  color: var(--c-text-3);
  letter-spacing: 0.05em;
  font-weight: 400;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  padding: 8px 18px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: 8px;
  transition: all var(--t-fast);
  position: relative;
}

.nav-menu a:hover {
  color: var(--c-text);
  background: var(--c-surface);
}

.nav-menu a.active {
  color: var(--c-cyan);
  background: var(--c-cyan-dim);
}

.nav-cta {
  margin-left: 8px;
}

.nav-platform {
  margin-left: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  padding: 9px 18px;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: all var(--t-fast);
}

.nav-platform svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.nav-platform:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: var(--c-cyan-dim);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--t-fast);
}

.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

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

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-bg-radial);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: var(--c-cyan);
  top: 10%;
  right: -10%;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: var(--c-purple);
  bottom: 10%;
  left: -5%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--c-text-2);
  margin-bottom: 1.75rem;
  backdrop-filter: blur(10px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4); }
  50% { opacity: 0.6; box-shadow: 0 0 0 8px rgba(0, 212, 255, 0); }
}

.hero-title {
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-title .line {
  display: block;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--c-text-2);
  line-height: 1.9;
  margin-bottom: 2.5rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
}

.hero-stat .num {
  font-size: 2.25rem;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.hero-stat .label {
  font-size: 0.875rem;
  color: var(--c-text-3);
  margin-top: 0.5rem;
}

/* ---- Page Hero (inner pages) ---- */
.page-hero {
  position: relative;
  padding: 160px 0 80px;
  overflow: hidden;
  background: var(--c-bg-2);
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-bg-radial);
}

.page-hero .hero-grid {
  opacity: 0.5;
}

.page-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.page-hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.page-hero-desc {
  font-size: 1.0625rem;
  color: var(--c-text-2);
  line-height: 1.8;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 2rem;
  font-size: 0.875rem;
  color: var(--c-text-3);
}

.breadcrumb a:hover {
  color: var(--c-cyan);
}

/* ---- Cards ---- */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--t-base);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.card:hover {
  border-color: var(--c-border-hover);
  background: var(--c-surface-hover);
  transform: translateY(-4px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.5), transparent);
  opacity: 0;
  transition: opacity var(--t-base);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.card-icon.cyan { background: rgba(0, 212, 255, 0.1); color: var(--c-cyan); }
.card-icon.blue { background: rgba(43, 127, 255, 0.1); color: var(--c-blue); }
.card-icon.purple { background: rgba(139, 92, 246, 0.1); color: var(--c-purple); }
.card-icon.teal { background: rgba(20, 184, 166, 0.1); color: var(--c-teal); }

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--c-white);
}

.card-desc {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.8;
}

/* ---- Grid ---- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ---- Feature List ---- */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--c-text-2);
}

.feature-list li::before {
  content: '';
  width: 20px;
  height: 20px;
  background: var(--c-cyan-dim);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  position: relative;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2300D4FF' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px;
}

/* ---- Stats Section ---- */
.stats-section {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  background: var(--c-bg-2);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item .num {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.stat-item .label {
  font-size: 0.9375rem;
  color: var(--c-text-3);
  margin-top: 0.75rem;
}

/* ---- Product Showcase ---- */
.product-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.product-showcase:nth-child(even) .product-visual {
  order: 2;
}

.product-visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-height: 360px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-3);
}

.product-visual-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-info .section-tag {
  margin-bottom: 1rem;
}

.product-info h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--c-white);
}

.product-info p {
  color: var(--c-text-2);
  margin-bottom: 1.5rem;
  line-height: 1.9;
}

/* ---- Timeline ---- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--c-border), transparent);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 2.5rem 3rem;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--c-cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.15);
}

.timeline-item:nth-child(odd)::before {
  right: -7px;
}

.timeline-item:nth-child(even)::before {
  left: -7px;
}

.timeline-year {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.7;
}

/* ---- Honor Badges ---- */
.honor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.honor-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 1.25rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: all var(--t-base);
}

.honor-item:hover {
  border-color: var(--c-border-hover);
  background: var(--c-surface-hover);
  transform: translateY(-2px);
}

.honor-item .icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-cyan-dim);
  border-radius: 10px;
  flex-shrink: 0;
  font-size: 1.25rem;
}

.honor-item .text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-text);
  line-height: 1.4;
}

/* ---- CTA Section ---- */
.cta-section {
  position: relative;
  padding: var(--space-xl) 0;
  overflow: hidden;
}

.cta-box {
  position: relative;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(139, 92, 246, 0.08));
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  padding: 4rem 3rem;
  text-align: center;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -10%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.1), transparent 70%);
  pointer-events: none;
}

.cta-box h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  position: relative;
}

.cta-box p {
  font-size: 1.0625rem;
  color: var(--c-text-2);
  margin-bottom: 2rem;
  position: relative;
}

.cta-box .btn {
  position: relative;
}

/* ---- Contact Form ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-info-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.contact-info-item .icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-cyan-dim);
  border-radius: 12px;
  flex-shrink: 0;
  color: var(--c-cyan);
}

.contact-info-item .icon svg {
  width: 22px;
  height: 22px;
}

.contact-info-item .label {
  font-size: 0.8125rem;
  color: var(--c-text-3);
  margin-bottom: 0.25rem;
}

.contact-info-item .value {
  font-size: 1.0625rem;
  color: var(--c-text);
  font-weight: 500;
  line-height: 1.6;
}

.contact-form {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(10px);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--c-text-2);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color var(--t-fast);
}

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

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* ---- Solution Card ---- */
.solution-card {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--t-base);
  overflow: hidden;
  min-height: 280px;
  display: flex;
  flex-direction: column;
}

.solution-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}

.solution-card:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-4px);
}

.solution-card:hover::after {
  transform: scaleX(1);
}

.solution-card .card-icon {
  margin-bottom: 1.25rem;
}

.solution-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.75rem;
}

.solution-card p {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.8;
  flex: 1;
}

.solution-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1.25rem;
}

.solution-card .tag {
  padding: 4px 12px;
  background: var(--c-surface-hover);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--c-text-3);
}

/* ---- Tech Stack ---- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.75rem 1rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: all var(--t-base);
  text-align: center;
}

.tech-item:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-4px);
}

.tech-item .icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.tech-item .name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-text);
}

.tech-item .desc {
  font-size: 0.8125rem;
  color: var(--c-text-3);
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--c-border);
  background: var(--c-bg-2);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .nav-logo {
  margin-bottom: 1.25rem;
}

.footer-brand .nav-logo .logo-img {
  width: 48px;
  height: 48px;
}

.footer-brand p {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  line-height: 1.8;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col ul a {
  font-size: 0.9375rem;
  color: var(--c-text-2);
}

.footer-col ul a:hover {
  color: var(--c-cyan);
}

.footer-contact p {
  font-size: 0.9375rem;
  color: var(--c-text-2);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--c-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--c-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--c-text-3);
}

.footer-bottom a:hover {
  color: var(--c-cyan);
}

/* ---- Animations ---- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

/* ---- Decorative ---- */
.deco-line {
  width: 48px;
  height: 3px;
  background: var(--grad-cyan);
  border-radius: 3px;
  margin: 1rem 0;
}

.deco-line.center {
  margin: 1rem auto;
}

/* ---- Partner Logos ---- */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.partner-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text-2);
  transition: all var(--t-base);
  text-align: center;
}

.partner-item:hover {
  border-color: var(--c-border-hover);
  color: var(--c-cyan);
  background: var(--c-surface-hover);
}

/* ---- Responsive ---- */
@media (max-width: 968px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .product-showcase { grid-template-columns: 1fr; gap: 2rem; }
  .product-showcase:nth-child(even) .product-visual { order: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline::before { left: 20px; }
  .timeline-item { width: 100%; padding-left: 3rem; padding-right: 0; text-align: left !important; left: 0 !important; }
  .timeline-item::before { left: 13px !important; right: auto !important; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(6, 11, 20, 0.98);
    backdrop-filter: blur(20px);
    padding: 1rem;
    gap: 0;
    border-bottom: 1px solid var(--c-border);
  }

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

  .nav-menu a {
    width: 100%;
    padding: 14px 18px;
  }

  .nav-cta,
  .nav-platform {
    margin-left: 0;
    margin-top: 8px;
    width: 100%;
    justify-content: center;
  }

  .nav-toggle {
    display: flex;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 1.5rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .cta-box {
    padding: 2.5rem 1.5rem;
  }

  .section {
    padding: 3.5rem 0;
  }
}