:root {
  --bg: #0b0c10;
  --bg-muted: #f7f8fa;
  --text: #151922;
  --text-muted: #5b6370;
  --primary: #165dff;
  --primary-600: #144fe0;
  --border: #e6e8eb;
  --radius: 12px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: #fff;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding-top: env(safe-area-inset-top);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand img {
  height: 28px;
  width: auto;
}
.brand-text {
  font-weight: 600;
  font-size: clamp(16px, 3.8vw, 18px);
}
.nav-toggle {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  position: relative;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 18px;
  height: 2px;
  background: var(--text);
  transform: translateX(-50%);
  transition: transform .2s ease;
}
.nav-toggle::before { top: 12px; }
.nav-toggle::after { top: 22px; }
.nav-toggle[aria-expanded="true"]::before { transform: translateX(-50%) rotate(45deg); top: 17px; }
.nav-toggle[aria-expanded="true"]::after { transform: translateX(-50%) rotate(-45deg); top: 17px; }

.site-nav {
  position: fixed;
  inset: calc(56px + env(safe-area-inset-top)) 0 auto 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 12px;
  padding: 12px 16px 16px;
  transform: translateY(calc(-100% - 56px - env(safe-area-inset-top)));
  transition: transform .18s ease;
}
.site-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  text-align: center;
  color: var(--text);
  border: 1px solid transparent;
  background: #fff;
}
.site-nav a:hover { border-color: var(--border); }
.site-nav a.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.site-nav.open { transform: translateY(0); }
.site-nav .cta {
  background: var(--primary);
  color: #fff;
}
.site-nav .cta:hover { background: var(--primary-600); }

.hero {
  background: linear-gradient(180deg, #e3f2fd 0%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}

.hero-slider {
  position: relative;
  width: 100%;
  min-height: 520px; /* Mobile min-height */
  display: flex;
  align-items: center;
}

.hero-slide {
  display: none;
  width: 100%;
  animation: fadeEffect 0.6s ease-in-out;
}

.hero-slide.active {
  display: block;
}

@keyframes fadeEffect {
  from {opacity: 0; transform: translateY(10px);} 
  to {opacity: 1; transform: translateY(0);}
}

.hero-inner {
  display: flex;
  flex-direction: column-reverse;
  gap: 32px;
  align-items: center;
}

.hero-text {
  width: 100%;
  text-align: center;
}

.hero-visual {
  width: 100%;
  display: flex;
  justify-content: center;
  position: relative;
}

.hero-visual::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(22, 93, 255, 0.05) 0%, rgba(255,255,255,0) 70%);
  transform: translate(-50%, -50%);
  z-index: -1;
}

.hero-img {
  width: 100%;
  max-width: 340px;
  height: 240px;
  object-fit: contain;
}

.hero-img:hover {
  transform: translateY(-5px);
}

.slider-controls {
  display: flex;
  justify-content: center;
  gap: 8px;
  z-index: 2;
  position: relative;
}

.dot {
  width: 10px;
  height: 10px;
  background-color: #cbd5e1;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
}

.dot.active {
  width: 28px;
  border-radius: 5px;
  background-color: var(--primary);
}

.hero h1 {
  font-size: clamp(32px, 8vw, 48px);
  margin: 0 0 16px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #151922, #3a4150);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: var(--text-muted);
  font-size: clamp(14px, 4.2vw, 16px);
  margin: 0 0 24px;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-weight: 600;
}
.btn.primary {
  border-color: transparent;
  background: var(--primary);
  color: #fff;
}
.btn.primary:hover { background: var(--primary-600); }

.section {
  padding: 28px 0;
}
.section-muted {
  background: var(--bg-muted);
}
.section h2 {
  font-size: clamp(20px, 5.8vw, 28px);
  margin: 0 0 16px;
}
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}
.card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.feature-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.feature-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
}
.feature-list span {
  font-weight: 600;
}

.arch-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.arch-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.arch-item h3 {
  font-size: 16px;
  margin: 0 0 6px;
}
.arch-item p {
  margin: 0;
  color: var(--text-muted);
}

.media-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.media-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.media-card .thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #f2f3f5;
}
.media-card .meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
}
.media-card .meta .name {
  color: var(--text-muted);
  font-size: 12px;
}
.media-card .meta .action {
  color: var(--primary);
  font-weight: 600;
}

.thumb.video {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #f2f3f5 0%, #eaeef2 100%);
  color: #4b4f57;
  font-size: 28px;
  font-weight: 700;
}

.contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.contact-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.contact-item span {
  color: var(--text-muted);
}
.contact-item a {
  color: var(--primary);
  font-weight: 600;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 18px 0;
  color: var(--text-muted);
}
.site-footer p {
  margin: 0;
  text-align: center;
}
.qrcode-card {
  background: #fff;
  padding: 16px;
}
.qrcode {
  width: clamp(160px, 40vw, 240px);
  display: block;
  margin: 8px auto 0;
  border-radius: 8px;
}
.qrcode-tip {
  text-align: center;
  color: var(--text-muted);
  margin: 8px 0 0;
}
.qrcode-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}


@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .site-nav {
    position: static;
    transform: none;
    border: none;
    display: flex;
    gap: 8px;
    padding: 0;
  }
  .site-nav a { padding: 10px 14px; }
  .hero-slider { min-height: 350px; } /* Desktop min-height */
  .hero-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  .hero-text {
    text-align: left;
    flex: 1;
    padding-right: 32px;
  }
  .hero-visual {
    flex: 1;
    justify-content: flex-end;
  }
  .hero-img {
    max-width: 100%;
    max-height: 280px;
    height: 280px; /* Fixed height for consistency */
    width: auto;
  }
  .hero-actions {
    justify-content: flex-start;
  }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .arch-grid { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: repeat(2, 1fr); }
  .media-grid { grid-template-columns: repeat(2, 1fr); }
  .qrcode-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .cards { grid-template-columns: repeat(4, 1fr); }
  .arch-grid { grid-template-columns: repeat(4, 1fr); }
  .media-grid { grid-template-columns: repeat(4, 1fr); }
}