:root {
  --bg: #080c10;
  --bg2: #0d1117;
  --surface: #111820;
  --border: rgba(255,255,255,0.07);
  --accent: #00e5ff;
  --accent2: #7c5cfc;
  --accent3: #ff6b35;
  --text: #e8edf3;
  --muted: #6b7a8d;
  --card-glow: rgba(0,229,255,0.08);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── GRID NOISE OVERLAY ── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none; z-index: 0;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center;
  padding: 0 48px;
  height: 68px;
  background: rgba(8,12,16,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-feature-settings: "ss01";
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  color: #fff;
  text-decoration: none;
  flex-shrink: 0;
}
.logo span { color: var(--accent); }

/* 首页专用：三项居中 */
nav ul.nav-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0;
  list-style: none;
}
nav ul.nav-center a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 400;
  padding: 6px 28px;
  letter-spacing: 0.03em;
  position: relative;
  transition: color 0.2s;
}
nav ul.nav-center a::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 28px;
  right: 28px;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform 0.22s ease;
}
nav ul.nav-center a:hover {
  color: #fff;
}
nav ul.nav-center a:hover::after {
  transform: scaleX(1);
}

/* 子页面：靠右排列（旧样式保留） */
nav ul:not(.nav-center) {
  display: flex; gap: 36px; list-style: none; margin-left: auto;
}
nav ul:not(.nav-center) a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 400;
  transition: color 0.2s;
  letter-spacing: 0.02em;
}
nav ul:not(.nav-center) a:hover { color: var(--text); }

.nav-cta {
  background: var(--accent);
  color: #000 !important;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 500 !important;
  transition: opacity 0.2s !important;
}
.nav-cta:hover { opacity: 0.85; }

/* ── HERO ── */
.hero {
  position: relative;
  min-height: auto;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  width: 700px; height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,229,255,0.12) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
}
.hero-glow2 {
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,92,252,0.1) 0%, transparent 70%);
  top: 30%; left: 30%;
  pointer-events: none;
  animation: pulse 6s ease-in-out infinite reverse;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.7; }
}

.hero-inner { position: relative; z-index: 1; max-width: 820px; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid rgba(0,229,255,0.3);
  background: rgba(0,229,255,0.06);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 32px;
}
.badge::before { content: '●'; animation: blink 2s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.8rem, 6.5vw, 5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 24px;
}
h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 540px;
  margin: 0 auto 44px;
  line-height: 1.7;
}

.hero-btns {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  padding: 14px 32px;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 8px;
  cursor: pointer; border: none;
}
.btn-primary:hover { background: #fff; transform: translateY(-2px); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  padding: 14px 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 8px;
  cursor: pointer;
}
.btn-secondary:hover { border-color: rgba(255,255,255,0.3); transform: translateY(-2px); }

.hero-stats {
  display: flex; justify-content: center; gap: 48px;
  margin-top: 36px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}
.stat-label { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }

/* ── SECTION COMMONS ── */
section { position: relative; z-index: 1; }
.section-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  line-height: 1.15;
}
.section-sub {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin-top: 16px;
  line-height: 1.7;
}
.container { max-width: 1320px; margin: 0 auto; padding: 0 40px; }
.section-pad { padding: 72px 0; }

/* ── SERVICES CARDS ── */
.services { background: var(--bg2); }
.services-header { text-align: center; margin-bottom: 64px; }
.services-header .section-sub { margin: 16px auto 0; }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 35px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.service-card::before {
  content: '';
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.service-card.gpt::before { background: radial-gradient(circle at top left, rgba(16,163,127,0.12), transparent 60%); }
.service-card.claude::before { background: radial-gradient(circle at top left, rgba(204,120,50,0.12), transparent 60%); }
.service-card.api::before { background: radial-gradient(circle at top left, rgba(124,92,252,0.12), transparent 60%); }
.service-card.gemini::before { background: radial-gradient(circle at top left, rgba(66,133,244,0.12), transparent 60%); }

/* 推荐角标 */
.card-recommend {
  position: absolute;
  top: 16px; right: 16px;
  background: linear-gradient(135deg, #00e5ff, #7c5cfc);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 100px;
}

/* 卡片备注小字 */
.card-warning {
  display: flex;
  align-items: flex-start;
  gap: 5px;
  margin-bottom: 14px;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.5;
}
.card-warning-icon { flex-shrink: 0; }

/* 多合一卡片颜色 */
.card-icon.aio { background: linear-gradient(135deg, rgba(0,229,255,0.15), rgba(157,124,255,0.15)); }
.card-btn.aio { background: linear-gradient(90deg, rgba(0,229,255,0.15), rgba(157,124,255,0.15)); color: #00e5ff; border: 1px solid rgba(0,229,255,0.35); }
.service-card.aio::before { background: radial-gradient(circle at top left, rgba(0,229,255,0.1), transparent 60%); }
.service-card.aio .card-title { background-image: linear-gradient(120deg, #00e5ff, #9d7cff); }

.service-card:hover { border-color: rgba(255,255,255,0.15); transform: translateY(-4px); }
.service-card:hover::before { opacity: 1; }

.card-icon {
  width: 72px; height: 72px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  padding: 14px;
}
.card-icon img { width: 100%; height: 100%; object-fit: contain; }
.card-icon.gpt { background: rgba(16,163,127,0.15); }
.card-icon.gpt img { filter: brightness(0) invert(1); }
.card-icon.claude { background: rgba(204,120,50,0.15); }
.card-icon.api { background: rgba(124,92,252,0.15); }
.card-icon.aio { background: linear-gradient(135deg, rgba(0,229,255,0.15), rgba(157,124,255,0.15)); }

.card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}
.service-card.gpt .card-title {
  background-image: linear-gradient(120deg, #10a37f, #e8edf3);
}
.service-card.claude .card-title {
  background-image: linear-gradient(120deg, #e8935a, #e8edf3);
}
.service-card.api .card-title {
  background-image: linear-gradient(120deg, #9d7cff, #e8edf3);
}
.service-card.gemini .card-title {
  background-image: linear-gradient(120deg, #4285f4, #e8edf3);
}
.card-desc { color: var(--muted); font-size: 0.92rem; line-height: 1.65; margin-bottom: 28px; }

.card-features {
  list-style: none;
  display: flex; flex-direction: column; gap: 10px;
  margin-bottom: 20px;
  flex: 1;
}
.card-features li {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem; color: var(--text);
}
.card-features li::before { content: '✓'; color: var(--accent); font-weight: 600; }

.card-price {
  display: flex; align-items: flex-end; gap: 6px;
  margin-bottom: 20px;
}
.price-from { font-size: 0.82rem; color: var(--muted); }
.price-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}
.price-unit { font-size: 0.85rem; color: var(--muted); padding-bottom: 4px; }

.card-btn {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-family: 'Inter', sans-serif;
}
.card-btn.gpt { background: rgba(16,163,127,0.15); color: #10a37f; border: 1px solid rgba(16,163,127,0.3); }
.card-btn.claude { background: rgba(204,120,50,0.15); color: #cc7832; border: 1px solid rgba(204,120,50,0.3); }
.card-btn.api { background: rgba(124,92,252,0.15); color: #9d7cff; border: 1px solid rgba(124,92,252,0.3); }
.card-btn:hover { filter: brightness(1.3); }

/* ── HOW IT WORKS ── */
.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

/* Left: steps */
.steps { display: flex; flex-direction: column; }
.step {
  display: flex; gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.step:last-child { border-bottom: none; }
.step-num {
  font-family: 'Syne', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.12em;
  min-width: 28px;
  padding-top: 3px;
}
.step-content {}
.step-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
}
.step-desc { color: var(--muted); font-size: 0.88rem; line-height: 1.7; }
.step-code {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-family: 'Courier New', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  word-break: break-all;
  cursor: pointer;
  transition: border-color 0.2s;
}
.step-code:hover { border-color: var(--accent); }
.step-code .copy-icon { font-size: 0.8rem; flex-shrink: 0; opacity: 0.6; }
.step-tips {
  margin-top: 14px;
  display: flex; flex-direction: column; gap: 7px;
}
.step-tip {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 0.82rem; color: var(--muted); line-height: 1.5;
}
.step-tip .tip-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0; margin-top: 6px;
}
.step-tip.warn .tip-dot { background: #f59e0b; }
.step-tip.warn { color: #d4a827; }

/* Right: visual panel */
.how-visual {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  position: relative;
  overflow: hidden;
}
.how-visual::after {
  content: '';
  position: absolute;
  bottom: -60px; right: -60px;
  width: 220px; height: 220px;
  background: radial-gradient(circle, rgba(0,229,255,0.1), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* Progress timeline inside visual */
.how-timeline { display: flex; flex-direction: column; gap: 0; position: relative; z-index: 1; }
.how-tl-item {
  display: flex; gap: 16px;
  padding-bottom: 24px;
  position: relative;
}
.how-tl-item:last-child { padding-bottom: 0; }

/* Vertical connector line */
.how-tl-item:not(:last-child) .tl-line-wrap::after {
  content: '';
  position: absolute;
  left: 15px; top: 32px; bottom: 0;
  width: 1px;
  background: var(--border);
}
.tl-line-wrap { position: relative; }

.tl-icon {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--bg2);
}
.tl-icon.done { background: rgba(0,229,255,0.1); border-color: rgba(0,229,255,0.35); }
.tl-icon.active { background: rgba(0,229,255,0.18); border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,229,255,0.1); }
.tl-icon.warn { background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.35); }

.tl-body { padding-top: 4px; }
.tl-label {
  font-family: 'Syne', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}
.tl-label.muted { color: var(--muted); }
.tl-sub { font-size: 0.78rem; color: var(--muted); line-height: 1.55; }
.tl-sub code {
  font-family: 'Courier New', monospace;
  font-size: 0.72rem;
  color: var(--accent);
  background: rgba(0,229,255,0.08);
  padding: 1px 6px; border-radius: 3px;
}
.tl-badge {
  display: inline-flex; align-items: center; gap: 5px;
  margin-top: 8px;
  font-size: 0.72rem;
  padding: 3px 10px; border-radius: 100px;
  font-weight: 500;
}
.tl-badge.success { background: rgba(34,197,94,0.12); color: #22c55e; border: 1px solid rgba(34,197,94,0.25); }
.tl-badge.info { background: rgba(0,229,255,0.08); color: var(--accent); border: 1px solid rgba(0,229,255,0.2); }
.tl-badge.caution { background: rgba(245,158,11,0.1); color: #f59e0b; border: 1px solid rgba(245,158,11,0.25); }

/* ── PRICING ── */
.pricing { background: var(--bg2); }
.pricing-header { text-align: center; margin-bottom: 64px; }
.pricing-header .section-sub { margin: 16px auto 0; }

.pricing-tabs {
  display: flex; justify-content: center; gap: 8px;
  margin-bottom: 48px;
}
.ptab {
  padding: 10px 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
}
.ptab.active, .ptab:hover {
  background: var(--surface);
  color: var(--text);
  border-color: rgba(255,255,255,0.15);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 28px;
  position: relative;
  transition: all 0.3s;
}
.price-card.featured {
  border-color: var(--accent);
  background: rgba(0,229,255,0.04);
}
.price-card.featured::before {
  content: '最受欢迎';
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #000;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 100px;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.plan-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.plan-price {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}
.plan-price sup { font-size: 1.2rem; vertical-align: super; }
.plan-period { font-size: 0.83rem; color: var(--muted); margin-bottom: 28px; }

.plan-features {
  list-style: none;
  display: flex; flex-direction: column; gap: 12px;
  margin-bottom: 32px;
}
.plan-features li {
  display: flex; gap: 10px;
  font-size: 0.88rem; color: var(--text);
}
.plan-features li span:first-child { color: var(--accent); flex-shrink: 0; }
.plan-features li .dim { color: var(--muted); }

.plan-btn {
  display: block; text-align: center;
  padding: 13px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-family: 'Inter', sans-serif;
}
.plan-btn.outline {
  border: 1px solid var(--border);
  color: var(--text);
  background: transparent;
}
.plan-btn.outline:hover { border-color: rgba(255,255,255,0.3); }
.plan-btn.fill {
  background: var(--accent);
  color: #000;
}
.plan-btn.fill:hover { background: #fff; }

/* ── TRUST / FEATURES ── */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.trust-item {
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: all 0.3s;
}
.trust-item:hover { border-color: rgba(255,255,255,0.12); transform: translateY(-2px); }
.trust-icon { font-size: 2rem; margin-bottom: 18px; }
.trust-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}
.trust-desc { font-size: 0.88rem; color: var(--muted); line-height: 1.65; }

/* ── FAQ ── */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
  cursor: pointer;
}
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  gap: 16px;
}
.faq-icon { color: var(--accent); font-size: 1.4rem; transition: transform 0.3s; flex-shrink: 0; }
.faq-a { font-size: 0.9rem; color: var(--muted); line-height: 1.7; max-height: 0; overflow: hidden; transition: all 0.3s; }
.faq-item.open .faq-a { max-height: 500px; padding-top: 14px; }
.faq-item.open .faq-icon { transform: rotate(45deg); }

/* ── CTA BANNER ── */
.cta-banner {
  background: var(--bg2);
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(124,92,252,0.15), transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.cta-banner .section-title { margin-bottom: 20px; }
.cta-banner .section-sub { margin: 0 auto 44px; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 52px 0 36px;
  position: relative; z-index: 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
  align-items: start;
}
.footer-brand .logo { display: block; margin-bottom: 14px; }
.footer-desc { font-size: 0.85rem; color: var(--muted); line-height: 1.7; max-width: 300px; }

.footer-col-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.87rem;
  transition: color 0.2s;
  cursor: pointer;
}
.footer-links a:hover { color: var(--accent); }

.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 0.8rem; color: var(--muted); }
.footer-badges { display: flex; gap: 10px; }
.fbadge {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--muted);
}

/* ── HAMBURGER ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
  z-index: 101;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.25s;
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端下拉菜单 */
.nav-mobile {
  display: none;
  position: fixed;
  top: 68px; left: 0; right: 0;
  z-index: 99;
  background: rgba(8,12,16,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  padding: 8px 0 16px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  display: block;
  padding: 14px 24px;
  color: var(--muted);
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.2s;
  border-bottom: 1px solid var(--border);
}
.nav-mobile a:last-child { border-bottom: none; }
.nav-mobile a:hover { color: #fff; }
.nav-mobile-cta {
  color: var(--accent) !important;
  font-weight: 500;
  margin-top: 4px;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  nav { padding: 0 20px; }
  nav ul.nav-center { display: none; }
  nav ul:not(.nav-center) { display: none; }
  .nav-hamburger { display: flex; }
  .container { padding: 0 20px; }
  .section-pad { padding: 56px 0; }
  .how-grid { grid-template-columns: 1fr; gap: 40px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-banner { padding: 72px 0; }
  .hero-stats { gap: 28px; }
  .pricing-tabs { flex-wrap: wrap; }
}

@media (max-width: 600px) {
  .trust-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .section-pad { padding: 44px 0; }
  .hero { padding: 100px 16px 52px; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 1.6rem; }
  .cta-banner { padding: 56px 0; }
  .how-visual { padding: 24px; }
  .trust-item { padding: 24px; }
  .services-header { margin-bottom: 40px; }
  .pricing-header { margin-bottom: 40px; }
  h1 { font-size: clamp(2.2rem, 10vw, 3rem); }
  .hero-desc { font-size: 1rem; }
  .badge { font-size: 0.72rem; letter-spacing: 0.05em; }
}

/* ── HERO BRANDS ROW ── */
.hero-brands {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.brand-chip {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.02em;
}
.brand-sep {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 300;
  opacity: 0.5;
}
.brand-tag {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(0,229,255,0.08);
  border: 1px solid rgba(0,229,255,0.25);
  padding: 4px 12px;
  border-radius: 100px;
  margin-left: 6px;
  text-transform: uppercase;
}

/* ── SCROLL ANIMATIONS ── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── BACK TO HOME FLOAT BTN ── */
.back-home-btn {
  position: fixed;
  top: 76px;
  left: 24px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px 8px 12px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 40px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  font-family: 'Inter', sans-serif;
  backdrop-filter: blur(12px);
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
}
.back-home-btn:hover {
  background: rgba(0, 229, 255, 0.15);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
  transform: translateX(-2px);
}
.back-home-btn svg {
  width: 13px; height: 13px;
  flex-shrink: 0;
}

/* ── QR MODAL ── */
.qr-modal {
  display: none;
  position: fixed; inset: 0; z-index: 999;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
}
.qr-modal.open { display: flex; }