*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  background: #010101;
  color: #f1f5f9;
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

:root {
  --bg: #010101;
  --surface: #121212;
  --surface-2: #1a1a1a;
  --border: rgba(255,255,255,0.08);
  --muted: #94a3b8;
  --cyan: #25f4ee;
  --pink: #fe2c55;
  --grad: linear-gradient(135deg, var(--cyan), var(--pink));
  --nav-h: 72px;
  --radius: 20px;
}

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* Nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 1000; height: var(--nav-h);
  background: rgba(1,1,1,0.85); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.logo-mark {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--grad); display: grid; place-items: center;
  box-shadow: 0 0 24px rgba(254,44,85,0.35);
}
.logo-mark svg { width: 22px; height: 22px; fill: #fff; }
.logo span { background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--muted); font-weight: 500; font-size: 0.92rem; transition: color 0.2s; }
.nav-links a:hover { color: #fff; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 999px; font-weight: 700; font-size: 0.88rem;
  background: var(--grad); color: #fff !important;
  box-shadow: 0 4px 24px rgba(254,44,85,0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(254,44,85,0.45); }
.nav-cta svg { width: 16px; height: 16px; fill: currentColor; }
.burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.burger span { width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: 0.3s; }
.burger.on span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.burger.on span:nth-child(2) { opacity: 0; }
.burger.on span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* Hero */
.hero {
  min-height: 100vh; padding: calc(var(--nav-h) + 60px) 0 80px;
  position: relative; overflow: hidden;
}
.hero-glow {
  position: absolute; border-radius: 50%; filter: blur(120px); pointer-events: none;
}
.hero-glow-1 { width: 600px; height: 600px; top: -200px; right: -100px; background: rgba(254,44,85,0.15); }
.hero-glow-2 { width: 500px; height: 500px; bottom: -100px; left: -150px; background: rgba(37,244,238,0.1); }
.hero-grid {
  position: absolute; inset: 0; opacity: 0.03;
  background-image: linear-gradient(#fff 1px, transparent 1px), linear-gradient(90deg, #fff 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero-layout {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 18px; border-radius: 999px; margin-bottom: 24px;
  background: rgba(254,44,85,0.14); border: 1px solid rgba(254,44,85,0.4);
  color: #ff8fab; font-size: 0.88rem; font-weight: 700;
  box-shadow: 0 0 24px rgba(254, 44, 85, 0.15);
}
.hero-tag-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--pink); animation: blink 2s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.4} }
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.12;
  letter-spacing: -0.03em; margin-bottom: 20px;
}
.hero h1 .hero-brand {
  background: var(--grad); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  filter: drop-shadow(0 0 28px rgba(254, 44, 85, 0.45));
}
.hero h1 .grad {
  background: var(--grad); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-lead { font-size: 1.1rem; color: var(--muted); max-width: 480px; margin-bottom: 32px; line-height: 1.75; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: 14px; font-weight: 700; font-size: 0.95rem;
  border: none; cursor: pointer; transition: all 0.25s; font-family: inherit;
}
.btn-main { background: var(--grad); color: #fff; box-shadow: 0 8px 32px rgba(254,44,85,0.35); }
.btn-main:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(254,44,85,0.5); }
.btn-ghost { background: rgba(255,255,255,0.05); color: #fff; border: 1px solid var(--border); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); }
.btn-sm { padding: 9px 18px; font-size: 0.85rem; border-radius: 10px; }
.btn svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.hero-trust { display: flex; gap: 28px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 10px; }
.trust-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  display: grid; place-items: center; color: var(--cyan);
}
.trust-icon svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.trust-item strong { display: block; font-size: 0.95rem; color: #fff; }
.trust-item span { font-size: 0.78rem; color: var(--muted); }

/* Phone mockup */
.hero-phone { display: flex; justify-content: center; position: relative; }
.phone {
  width: 280px; background: #1a1a1a; border-radius: 36px;
  border: 3px solid #333; padding: 12px; position: relative;
  box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 60px rgba(254,44,85,0.15);
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
.phone-notch { width: 100px; height: 24px; background: #010101; border-radius: 0 0 16px 16px; margin: 0 auto 8px; }
.phone-screen {
  position: relative; background: #000; border-radius: 24px; overflow: hidden;
  aspect-ratio: 9/16;
}
.phone-live {
  position: absolute; inset: 0; overflow: hidden; background: #010101;
}
.phone-header {
  position: absolute; top: 0; left: 0; right: 0; z-index: 4;
  padding: 12px 16px; display: flex; justify-content: space-between; align-items: center;
  background: transparent;
  text-shadow: 0 1px 8px rgba(0,0,0,0.85);
}
.phone-header span { font-size: 0.75rem; font-weight: 700; color: #fff; }
.phone-header-live { color: var(--cyan) !important; }
/* 背景视频：居中铺满，超出裁剪 */
.phone-live-video {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  transform: translate(-50%, -50%);
  object-fit: cover;
  object-position: center center;
  pointer-events: none;
  border: none;
}
.phone-live-overlay {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.35) 0%, transparent 22%),
    linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.12) 50%, rgba(0,0,0,0.3) 100%);
}
.phone-live-ui {
  position: absolute; inset: 0; z-index: 2;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 16px; pointer-events: none;
}
.phone-live-ui > * { pointer-events: auto; }
.live-badge {
  position: absolute; top: 44px; left: 16px; z-index: 3;
  display: flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 6px;
  background: var(--pink); font-size: 0.7rem; font-weight: 700;
}
.live-badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: #fff; animation: blink 1s infinite; }
.phone-stats {
  display: flex; gap: 16px; margin-bottom: 12px;
}
.phone-stat { text-align: center; }
.phone-stat b { display: block; font-size: 0.85rem; }
.phone-stat small { font-size: 0.65rem; color: var(--muted); }
.phone-product {
  background: rgba(255,255,255,0.08); backdrop-filter: blur(10px);
  border-radius: 12px; padding: 12px; display: flex; gap: 10px; align-items: center;
  border: 1px solid rgba(255,255,255,0.1);
}
.phone-product-img {
  width: 44px; height: 44px; border-radius: 8px;
  background: var(--grad); flex-shrink: 0;
}
.phone-product-info b { font-size: 0.75rem; display: block; }
.phone-product-info span { font-size: 0.68rem; color: var(--cyan); font-weight: 700; }
.phone-signal {
  position: absolute; top: 50%; right: -20px; transform: translateY(-50%);
  background: rgba(18, 18, 18, 0.95); border: 1px solid rgba(37, 244, 238, 0.35); border-radius: 14px;
  padding: 16px 18px; min-width: 172px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 32px rgba(37, 244, 238, 0.12);
}
.signal-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: 0.78rem; }
.signal-row:last-child { margin-bottom: 0; }
.signal-row span:first-child { color: var(--muted); }
.signal-row span:last-child { color: var(--cyan); font-weight: 700; }
.signal-bar { height: 4px; border-radius: 999px; background: rgba(255,255,255,0.08); margin-top: 10px; overflow: hidden; }
.signal-bar i { display: block; height: 100%; width: 96%; border-radius: inherit; background: var(--grad); }

/* Scenarios */
.scenarios { padding: 100px 0; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-label {
  display: inline-block; padding: 4px 14px; border-radius: 999px; margin-bottom: 14px;
  background: rgba(37,244,238,0.08); border: 1px solid rgba(37,244,238,0.2);
  color: var(--cyan); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}
.section-title { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.section-desc { color: var(--muted); max-width: 540px; margin: 0 auto; font-size: 1rem; }
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.scenario-card {
  padding: 32px 28px; border-radius: var(--radius);
  background: var(--bg); border: 1px solid var(--border);
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.scenario-card:hover {
  transform: translateY(-6px); border-color: rgba(254,44,85,0.3);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}
.scenario-icon {
  width: 52px; height: 52px; border-radius: 14px; margin-bottom: 20px;
  display: grid; place-items: center;
}
.scenario-icon svg { width: 24px; height: 24px; stroke: #fff; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.scenario-icon.i1 { background: linear-gradient(135deg, #fe2c55, #ff6b8a); }
.scenario-icon.i2 { background: linear-gradient(135deg, #25f4ee, #06b6d4); }
.scenario-icon.i3 { background: linear-gradient(135deg, #a855f7, #6366f1); }
.scenario-icon.i4 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.scenario-icon.i5 { background: linear-gradient(135deg, #10b981, #059669); }
.scenario-icon.i6 { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.scenario-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.scenario-card p { color: var(--muted); font-size: 0.9rem; line-height: 1.7; }

/* Why */
.why { padding: 100px 0; }
.why-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.why-list { display: flex; flex-direction: column; gap: 24px; margin-top: 36px; }
.why-item { display: flex; gap: 16px; }
.why-num {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: rgba(254,44,85,0.1); border: 1px solid rgba(254,44,85,0.2);
  display: grid; place-items: center;
  font-weight: 800; font-size: 0.9rem; color: var(--pink);
}
.why-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.why-item p { color: var(--muted); font-size: 0.9rem; line-height: 1.65; }
.why-visual {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px;
  padding: 32px; position: relative; overflow: hidden;
}
.why-visual::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad);
}
.map-node {
  display: flex; align-items: center; gap: 16px; padding: 16px;
  background: var(--bg); border-radius: 14px; margin-bottom: 12px; border: 1px solid var(--border);
}
.map-node:last-child { margin-bottom: 0; }
.map-flag {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, #1e3a8a, #dc2626);
  display: grid; place-items: center; font-size: 1.2rem; flex-shrink: 0;
}
.map-node-info b { display: block; font-size: 0.95rem; margin-bottom: 2px; }
.map-node-info span { font-size: 0.82rem; color: var(--muted); }
.map-status { margin-left: auto; padding: 4px 10px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; background: rgba(16,185,129,0.15); color: #34d399; }

/* Features strip */
.feat-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.feat-item { padding: 36px 24px; text-align: center; border-right: 1px solid var(--border); }
.feat-item:last-child { border-right: none; }
.feat-item svg { width: 28px; height: 28px; stroke: var(--cyan); fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 12px; }
.feat-item b { display: block; font-size: 1.5rem; font-weight: 800; margin-bottom: 4px; }
.feat-item b em { font-style: normal; background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.feat-item span { font-size: 0.85rem; color: var(--muted); }

/* Pricing */
.pricing { padding: 100px 0; }
.tabs {
  display: flex; justify-content: center; gap: 4px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 4px; max-width: 400px; margin: 0 auto 48px;
}
.tab-btn {
  flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border: none; border-radius: 10px;
  background: transparent; color: var(--muted); font-weight: 600;
  font-size: 0.92rem; cursor: pointer; transition: all 0.25s; font-family: inherit;
}
.tab-btn svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.tab-btn.active { background: var(--grad); color: #fff; box-shadow: 0 4px 20px rgba(254,44,85,0.3); }
.tab-panel.hidden { display: none; }
.tab-panel { animation: fadeUp 0.4s ease; }
@keyframes fadeUp { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:none; } }

.price-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.price-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; position: relative; transition: transform 0.3s, border-color 0.3s;
}
.price-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.15); }
.price-card.hot { border-color: rgba(254,44,85,0.5); box-shadow: 0 0 40px rgba(254,44,85,0.12); }
.price-card.hot::before {
  content: '推荐'; position: absolute; top: -1px; right: 20px;
  padding: 4px 12px; border-radius: 0 0 8px 8px;
  background: var(--grad); font-size: 0.72rem; font-weight: 700;
}
.price-tag { font-size: 0.78rem; color: var(--muted); margin-bottom: 8px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.price-name { font-size: 1rem; font-weight: 700; margin-bottom: 16px; line-height: 1.4; }
.price-amount { font-size: 2.2rem; font-weight: 800; margin-bottom: 4px; }
.price-amount small { font-size: 0.85rem; color: var(--muted); font-weight: 500; }
.price-use { font-size: 0.82rem; color: var(--cyan); margin-bottom: 20px; font-weight: 600; }
.price-specs { margin-bottom: 24px; }
.price-specs li {
  display: flex; justify-content: space-between; padding: 8px 0;
  border-bottom: 1px solid var(--border); font-size: 0.85rem;
}
.price-specs li:last-child { border-bottom: none; }
.price-specs li span:first-child { color: var(--muted); }
.price-card .btn { width: 100%; }

.cluster-table-wrap {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); background: var(--surface);
}
.cluster-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.cluster-table th {
  padding: 16px; text-align: center; background: var(--bg);
  color: var(--muted); font-size: 0.78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
}
.cluster-table th:first-child { text-align: left; }
.cluster-table td { padding: 18px 16px; text-align: center; border-bottom: 1px solid var(--border); }
.cluster-table td:first-child { text-align: left; font-weight: 600; }
.cluster-table tr:hover { background: rgba(255,255,255,0.02); }
.cluster-table tr:last-child td { border-bottom: none; }
.cluster-table .price { color: var(--cyan); font-weight: 800; font-size: 1.05rem; }
.cluster-table select {
  padding: 6px 10px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: #fff; font-size: 0.82rem; font-family: inherit;
}
.price-notes {
  margin-top: 40px; padding: 28px 32px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  border-left: 3px solid var(--pink);
}
.price-notes h3 { font-size: 1.05rem; margin-bottom: 16px; }
.notes-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px; }
.notes-grid li {
  display: flex; align-items: center; gap: 10px;
  color: var(--muted); font-size: 0.88rem;
}
.notes-grid li svg { width: 18px; height: 18px; stroke: var(--cyan); fill: none; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

/* Steps */
.steps { padding: 100px 0; background: var(--surface); border-top: 1px solid var(--border); }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 56px; }
.step-card { text-align: center; position: relative; }
.step-card:not(:last-child)::after {
  content: ''; position: absolute; top: 28px; right: -12px; width: 24px; height: 2px;
  background: linear-gradient(90deg, var(--pink), var(--cyan));
}
.step-num {
  width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 18px;
  background: var(--grad); display: grid; place-items: center;
  font-weight: 800; font-size: 1.2rem; color: #fff;
  box-shadow: 0 8px 24px rgba(254,44,85,0.3);
}
.step-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.step-card p { color: var(--muted); font-size: 0.85rem; line-height: 1.6; }

/* FAQ */
.faq { padding: 100px 0; }
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 48px; }
.faq-item {
  padding: 24px 28px; border-radius: 16px;
  background: var(--surface); border: 1px solid var(--border);
}
.faq-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 10px; display: flex; align-items: center; gap: 10px; }
.faq-item h4 svg { width: 18px; height: 18px; stroke: var(--pink); fill: none; stroke-width: 2; flex-shrink: 0; }
.faq-item p { color: var(--muted); font-size: 0.88rem; line-height: 1.7; }

/* CTA */
.cta {
  padding: 80px 0; margin: 0 24px 80px; border-radius: 28px;
  background: var(--grad); text-align: center; position: relative; overflow: hidden;
}
.cta::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-inner { position: relative; z-index: 1; }
.cta h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: 12px; color: #fff; }
.cta p { color: rgba(255,255,255,0.85); margin-bottom: 28px; font-size: 1rem; }
.cta .btn { background: #fff; color: #fe2c55; box-shadow: 0 8px 32px rgba(0,0,0,0.2); }
.cta .btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,0,0,0.3); }

/* Footer */
.footer { padding: 48px 0 24px; border-top: 1px solid var(--border); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
.footer-copy { color: #475569; font-size: 0.85rem; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--muted); font-size: 0.85rem; transition: color 0.2s; }
.footer-links a:hover { color: #fff; }

/* Float stack: back-to-top + contact widget */
.float-stack {
  position: fixed; right: 24px; bottom: 24px; z-index: 999;
  display: flex; flex-direction: column; align-items: flex-end; gap: 12px;
}
.back-top {
  width: 48px; height: 48px; border-radius: 50%; border: 1px solid var(--border);
  background: rgba(18, 18, 18, 0.92); backdrop-filter: blur(20px); cursor: pointer;
  display: grid; place-items: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity 0.25s, visibility 0.25s, transform 0.25s, border-color 0.2s, box-shadow 0.2s;
  pointer-events: none;
}
.back-top.visible { opacity: 1; visibility: visible; transform: none; pointer-events: auto; }
.back-top:hover {
  border-color: rgba(37,244,238,0.35);
  box-shadow: 0 8px 28px rgba(37,244,238,0.15);
}
.back-top svg {
  width: 22px; height: 22px; stroke: #fff; fill: none;
  stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round;
}

/* Float contact widget */
.float-widget { width: 260px; }
.float-widget.collapsed { width: auto; }
.float-panel {
  background: rgba(18, 18, 18, 0.92);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
.float-widget:not(.collapsed) .float-panel { animation: floatIn 0.35s ease; }
@keyframes floatIn {
  from { opacity:0; transform:translateY(16px); }
  to { opacity:1; transform:none; }
}
.float-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.float-header-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.88rem; font-weight: 700; color: #fff;
}
.float-header-title svg {
  width: 16px; height: 16px; stroke: var(--cyan); fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.float-online {
  display: flex; align-items: center; gap: 5px;
  font-size: 0.72rem; color: #34d399; font-weight: 600;
}
.float-online i {
  width: 7px; height: 7px; border-radius: 50%; background: #34d399;
  box-shadow: 0 0 8px #34d399; animation: blink 2s infinite;
}
.float-header-actions { display: flex; align-items: center; gap: 10px; }
.float-close {
  width: 28px; height: 28px; border: none; border-radius: 8px; cursor: pointer;
  background: rgba(255,255,255,0.06); display: grid; place-items: center;
  transition: background 0.2s;
}
.float-close:hover { background: rgba(255,255,255,0.12); }
.float-close svg {
  width: 14px; height: 14px; stroke: var(--muted); fill: none;
  stroke-width: 2; stroke-linecap: round;
}
.float-close:hover svg { stroke: #fff; }
.float-list { padding: 8px; display: flex; flex-direction: column; gap: 6px; }
.float-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 12px; border-radius: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid transparent;
  transition: all 0.25s; cursor: pointer;
}
.float-item:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  transform: translateX(-3px);
}
.float-item.item-1:hover { border-color: rgba(37,244,238,0.35); box-shadow: 0 4px 20px rgba(37,244,238,0.12); }
.float-item.item-2:hover { border-color: rgba(254,44,85,0.35); box-shadow: 0 4px 20px rgba(254,44,85,0.12); }
.float-avatar {
  width: 40px; height: 40px; border-radius: 11px; flex-shrink: 0;
  display: grid; place-items: center;
}
.float-item.item-1 .float-avatar { background: linear-gradient(135deg, #0088cc, #25f4ee); }
.float-item.item-2 .float-avatar { background: linear-gradient(135deg, #fe2c55, #ff6b8a); }
.float-avatar svg { width: 20px; height: 20px; fill: #fff; }
.float-info { flex: 1; min-width: 0; }
.float-info b { display: block; font-size: 0.85rem; font-weight: 700; color: #fff; margin-bottom: 2px; }
.float-info span { font-size: 0.72rem; color: var(--muted); }
.float-arrow {
  width: 28px; height: 28px; border-radius: 8px; flex-shrink: 0;
  background: rgba(255,255,255,0.06);
  display: grid; place-items: center;
  transition: background 0.2s;
}
.float-item:hover .float-arrow { background: rgba(255,255,255,0.12); }
.float-arrow svg {
  width: 14px; height: 14px; stroke: var(--muted); fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  transition: stroke 0.2s, transform 0.2s;
}
.float-item:hover .float-arrow svg { stroke: #fff; transform: translateX(2px); }
.float-toggle {
  display: none;
  width: 56px; height: 56px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--grad); color: #fff;
  box-shadow: 0 8px 28px rgba(254,44,85,0.4);
  place-items: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.float-toggle:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(254,44,85,0.5); }
.float-toggle svg {
  width: 26px; height: 26px; stroke: #fff; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.float-widget.collapsed .float-panel { display: none; }
.float-widget.collapsed .float-toggle { display: grid; }
.float-widget:not(.collapsed) .float-toggle { display: none; }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s, transform 0.6s; }
.reveal.show { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1024px) {
  .hero-layout, .why-layout { grid-template-columns: 1fr; text-align: center; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-trust { justify-content: center; }
  .phone-signal { display: none; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .price-cards { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .step-card:not(:last-child)::after { display: none; }
  .why-list { text-align: left; }
}
@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; padding: 24px; gap: 20px;
    background: rgba(1,1,1,0.97); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%); opacity: 0; transition: 0.3s; pointer-events: none;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .burger { display: flex; }
  .feat-strip { grid-template-columns: repeat(2, 1fr); }
  .feat-item:nth-child(2) { border-right: none; }
  .feat-item { border-bottom: 1px solid var(--border); }
  .feat-item:nth-child(3), .feat-item:nth-child(4) { border-bottom: none; }
  .scenario-grid, .faq-grid, .price-cards { grid-template-columns: 1fr; }
  .cluster-table-wrap { overflow-x: auto; }
  .steps-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .float-stack { right: 16px; bottom: 16px; }
  .float-widget:not(.collapsed) { width: min(260px, calc(100vw - 32px)); }
}