:root {
  --bg: #060b14;
  --bg-2: #0c1220;
  --panel: rgba(14, 22, 40, 0.72);
  --line: rgba(88, 166, 255, 0.18);
  --text: #e8eef7;
  --muted: #8b9bb4;
  --cyan: #00d4ff;
  --blue: #4a90d9;
  --blue-2: #357abd;
  --green: #27ae60;
  --purple: #7c5cff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --radius: 20px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black 30%, transparent 85%);
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(600px 400px at 15% 10%, rgba(0, 212, 255, 0.12), transparent 60%),
    radial-gradient(500px 360px at 85% 20%, rgba(74, 144, 217, 0.14), transparent 60%),
    radial-gradient(700px 500px at 50% 100%, rgba(124, 92, 255, 0.08), transparent 60%);
}

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(6, 11, 20, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.35);
}

.nav-links {
  display: flex;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #fff;
  box-shadow: 0 12px 32px rgba(0, 212, 255, 0.25);
}

.btn-outline {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.hero {
  position: relative;
  padding: 88px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(0, 212, 255, 0.06);
  color: var(--cyan);
  font-size: 13px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero h1 span {
  background: linear-gradient(135deg, #fff 20%, var(--cyan) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  color: var(--muted);
  font-size: 18px;
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  padding: 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.stat-card strong {
  display: block;
  font-size: 24px;
  color: var(--cyan);
  margin-bottom: 4px;
}

.stat-card span { color: var(--muted); font-size: 13px; }

.phone-stack {
  position: relative;
  min-height: 620px;
}

.phone-main {
  width: min(100%, 320px);
  margin: 0 auto;
  border-radius: 34px;
  padding: 12px;
  background: linear-gradient(160deg, #1a2332, #0d1118);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow), 0 0 0 1px rgba(0, 212, 255, 0.08);
}

.phone-main img {
  width: 100%;
  display: block;
  border-radius: 24px;
}

.phone-float {
  position: absolute;
  width: 180px;
  border-radius: 22px;
  padding: 8px;
  background: rgba(12, 18, 32, 0.92);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.phone-float img {
  width: 100%;
  border-radius: 16px;
  display: block;
}

.phone-float.left { left: 0; top: 120px; transform: rotate(-8deg); }
.phone-float.right { right: 0; bottom: 40px; transform: rotate(8deg); }

.section {
  padding: 88px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 14px;
}

.section-head p {
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  transition: transform 0.25s, border-color 0.25s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.35);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 24px;
  margin-bottom: 18px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.18);
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--muted);
  font-size: 15px;
}

.curve-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 32px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.curve-copy h3 {
  font-size: 30px;
  margin-bottom: 16px;
}

.curve-copy p {
  color: var(--muted);
  margin-bottom: 18px;
}

.curve-list {
  list-style: none;
  display: grid;
  gap: 12px;
}

.curve-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: #c8d4e8;
  font-size: 15px;
}

.curve-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  flex-shrink: 0;
}

.chart-wrap {
  position: relative;
  padding: 18px;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.chart-wrap canvas {
  width: 100%;
  height: 280px;
  display: block;
}

.chart-legend {
  display: flex;
  gap: 18px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-item {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 24px;
  align-items: center;
  padding: 24px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.showcase-item.reverse {
  grid-template-columns: 1.05fr 0.95fr;
}

.showcase-item.reverse .shot { order: 2; }
.showcase-item.reverse .copy { order: 1; }

.shot {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
}

.shot img {
  width: 100%;
  display: block;
}

.tag {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.25);
  background: rgba(0, 212, 255, 0.08);
  margin-bottom: 12px;
}

.copy h3 {
  font-size: 26px;
  margin-bottom: 12px;
}

.copy p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 14px;
}

.copy ul {
  list-style: none;
  display: grid;
  gap: 8px;
}

.copy li {
  color: #c8d4e8;
  font-size: 14px;
  padding-left: 18px;
  position: relative;
}

.copy li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--cyan);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.step {
  position: relative;
  padding: 24px 20px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.step-num {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.step h4 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step p {
  color: var(--muted);
  font-size: 14px;
}

.cta {
  margin: 0 0 88px;
  padding: 56px;
  border-radius: 28px;
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.25);
  background:
    radial-gradient(circle at top, rgba(0, 212, 255, 0.12), transparent 55%),
    linear-gradient(180deg, rgba(74, 144, 217, 0.12), rgba(6, 11, 20, 0.4));
}

.cta h2 {
  font-size: 34px;
  margin-bottom: 12px;
}

.cta p {
  color: var(--muted);
  margin-bottom: 28px;
}

.qrcode-box {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding: 24px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.2);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
}

.qrcode-img {
  width: 220px;
  height: auto;
  max-width: min(220px, 70vw);
  display: block;
  object-fit: contain;
  background: #fff;
  border-radius: 16px;
  padding: 12px;
  box-sizing: content-box;
}

.qrcode-tip {
  font-size: 14px;
  color: var(--cyan);
}

.qrcode-search {
  margin-bottom: 0 !important;
  font-size: 15px;
}

.qrcode-search strong {
  color: var(--text);
  font-weight: 700;
}

/* 产品介绍（GEO：可引用的事实块） */
.def-box {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.def-lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 28px;
}

.def-lead strong { color: #fff; }

.def-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px 24px;
}

.def-facts div {
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.def-facts dt {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.def-facts dd {
  font-size: 15px;
  color: var(--text);
  margin: 0;
}

.def-facts a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* FAQ（SEO + GEO） */
.faq-grid {
  display: grid;
  gap: 16px;
}

.faq-item {
  padding: 24px 28px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
}

.faq-item h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: #fff;
}

.faq-item p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 960px) {
  .nav-links { display: none; }
  .hero-grid,
  .curve-panel,
  .showcase-item,
  .showcase-item.reverse {
    grid-template-columns: 1fr;
  }
  .showcase-item.reverse .shot,
  .showcase-item.reverse .copy { order: unset; }
  .feature-grid,
  .timeline { grid-template-columns: 1fr 1fr; }
  .phone-float { display: none; }
  .hero-stats { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .feature-grid,
  .timeline,
  .showcase-grid { grid-template-columns: 1fr; }
  .cta { padding: 36px 24px; }
}