/* =========================================================
   筑界AI · ArchVerse AI 官网样式
   - 明暗双主题（data-theme="light" / 默认暗色）
   - 品牌主色：靛蓝(#2456ff) → 青(#00b3a4)
   - 响应式：>=1024 桌面 / 768-1023 平板 / <768 移动
   ========================================================= */

/* ---------- 主题变量（暗色为默认） ---------- */
:root {
  --c-primary: #2456ff;
  --c-primary-2: #00b3a4;
  --c-primary-soft: rgba(36, 86, 255, 0.16);
  --grad-primary: linear-gradient(135deg, #2456ff 0%, #00b3a4 100%);
  --grad-text: linear-gradient(120deg, #6ea0ff 0%, #2456ff 45%, #00d8c4 100%);

  --c-bg: #070b16;
  --c-bg-2: #0d1426;
  --c-surface: rgba(255, 255, 255, 0.04);
  --c-surface-2: rgba(255, 255, 255, 0.07);
  --c-border: rgba(255, 255, 255, 0.1);
  --c-text: #eef2fb;
  --c-text-2: #aeb8d0;
  --c-text-3: #7d869f;
  --c-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --c-header-bg: rgba(7, 11, 22, 0.72);
  --hero-glow: radial-gradient(60% 60% at 72% 18%, rgba(36, 86, 255, 0.38), transparent 70%),
               radial-gradient(50% 50% at 20% 80%, rgba(0, 179, 164, 0.22), transparent 70%);
  --grid-line: rgba(255, 255, 255, 0.045);
}

:root[data-theme="light"] {
  --c-primary: #1d4ed8;
  --c-primary-2: #0d9488;
  --c-primary-soft: rgba(29, 78, 216, 0.09);
  --grad-primary: linear-gradient(135deg, #1d4ed8 0%, #0d9488 100%);
  --grad-text: linear-gradient(120deg, #1d4ed8 0%, #2563eb 50%, #0d9488 100%);

  --c-bg: #f5f7fc;
  --c-bg-2: #ffffff;
  --c-surface: #ffffff;
  --c-surface-2: #eef2fb;
  --c-border: rgba(15, 23, 60, 0.09);
  --c-text: #0f172a;
  --c-text-2: #46506b;
  --c-text-3: #7b849c;
  --c-shadow: 0 20px 50px rgba(30, 50, 120, 0.12);
  --c-header-bg: rgba(255, 255, 255, 0.82);
  --hero-glow: radial-gradient(60% 60% at 72% 18%, rgba(36, 86, 255, 0.16), transparent 70%),
               radial-gradient(50% 50% at 20% 80%, rgba(0, 179, 164, 0.12), transparent 70%);
  --grid-line: rgba(15, 23, 60, 0.04);
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans CJK SC", sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .4s ease, color .4s ease;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 15px; font-weight: 600; line-height: 1;
  padding: 12px 22px; border-radius: 12px; cursor: pointer;
  border: 1px solid transparent; transition: transform .2s ease, box-shadow .25s ease, background .25s ease, opacity .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-lg { padding: 15px 30px; font-size: 16px; }
.btn-block { width: 100%; }
.btn-primary { background: var(--grad-primary); color: #fff; box-shadow: 0 10px 28px rgba(36, 86, 255, 0.4); }
.btn-primary:hover { box-shadow: 0 14px 36px rgba(36, 86, 255, 0.55); }
.btn-ghost { background: var(--c-surface); color: var(--c-text); border-color: var(--c-border); }
.btn-ghost:hover { background: var(--c-surface-2); border-color: var(--c-primary); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  background: var(--c-header-bg);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, box-shadow .3s;
}
.site-header.scrolled { border-bottom-color: var(--c-border); box-shadow: 0 8px 30px rgba(0,0,0,0.12); }
.nav { display: flex; align-items: center; gap: 24px; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-logo { width: 40px; height: 40px; border-radius: 11px; box-shadow: 0 6px 18px rgba(36,86,255,0.4); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: .3px;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.brand-sub { font-size: 11px; color: var(--c-text-3); letter-spacing: 1px; }

.nav-links { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--c-text-2); position: relative; transition: color .2s; }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px; background: var(--grad-primary); transition: width .25s; border-radius: 2px; }
.nav-links a:hover { color: var(--c-text); }
.nav-links a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 12px; }

/* 语言切换 */
.lang-switch { position: relative; }
.lang-btn { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; color: var(--c-text-2);
  background: transparent; border: 1px solid var(--c-border); border-radius: 10px; padding: 8px 12px; cursor: pointer; transition: all .2s; }
.lang-btn:hover { color: var(--c-text); border-color: var(--c-primary); }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 150px; list-style: none;
  background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: 12px; padding: 6px;
  box-shadow: var(--c-shadow); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all .2s; z-index: 50;
}
.lang-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu li { padding: 9px 12px; border-radius: 8px; font-size: 14px; color: var(--c-text-2); cursor: pointer; transition: all .15s; }
.lang-menu li:hover { background: var(--c-primary-soft); color: var(--c-primary); }
.lang-menu li.active { background: var(--c-primary-soft); color: var(--c-primary); font-weight: 600; }

/* 主题切换 */
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px;
  border-radius: 10px; border: 1px solid var(--c-border); background: transparent; color: var(--c-text-2); cursor: pointer; transition: all .2s; }
.theme-toggle:hover { color: var(--c-primary); border-color: var(--c-primary); }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.menu-toggle { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--c-border); border-radius: 10px; cursor: pointer; }
.menu-toggle span { width: 18px; height: 2px; background: var(--c-text); border-radius: 2px; transition: all .3s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 区块通用 ---------- */
.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--c-bg-2); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 60px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--c-primary); background: var(--c-primary-soft); padding: 6px 14px; border-radius: 999px; margin-bottom: 18px; }
.section-title { font-size: clamp(28px, 4vw, 42px); font-weight: 800; line-height: 1.2; letter-spacing: -.5px; }
.section-sub { margin-top: 16px; font-size: 17px; color: var(--c-text-2); }
.grid { display: grid; gap: 24px; }

.card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 18px; transition: transform .3s ease, box-shadow .3s ease, border-color .3s; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }
.hero-glow { position: absolute; inset: 0; background: var(--hero-glow); pointer-events: none; }
.hero-grid { position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px; mask-image: radial-gradient(70% 60% at 50% 35%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 35%, #000 30%, transparent 80%); }
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.badge { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--c-primary);
  border: 1px solid var(--c-border); background: var(--c-surface); padding: 7px 16px; border-radius: 999px; margin-bottom: 24px; }
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-primary-2); box-shadow: 0 0 0 4px var(--c-primary-soft); }
.hero-title { font-size: clamp(34px, 5vw, 58px); font-weight: 900; line-height: 1.12; letter-spacing: -1px; }
.hero-title { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-desc { margin-top: 22px; font-size: 18px; color: var(--c-text-2); max-width: 540px; }
.hero-cta { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { margin-top: 46px; display: flex; gap: 40px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat-num, .stat-suffix { font-size: 32px; font-weight: 800; line-height: 1; display: inline; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-label { margin-top: 8px; font-size: 14px; color: var(--c-text-3); }
.hero-visual { position: relative; }
.hero-visual img { border-radius: 20px; box-shadow: var(--c-shadow); border: 1px solid var(--c-border); }
.hero-visual .float-card {
  position: absolute; left: -20px; bottom: 28px; display: flex; align-items: center; gap: 12px;
  background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: 14px; padding: 12px 16px;
  box-shadow: var(--c-shadow); backdrop-filter: blur(8px); animation: floaty 4.5s ease-in-out infinite;
}
.hero-visual .float-card .fc-ico { width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-soft); color: var(--c-primary); }
.hero-visual .float-card .fc-t { font-size: 14px; font-weight: 700; }
.hero-visual .float-card .fc-d { font-size: 12px; color: var(--c-text-3); }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ---------- 信任条 ---------- */
.trust { padding: 40px 0; border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); }
.trust-label { text-align: center; font-size: 13px; letter-spacing: 1px; color: var(--c-text-3); margin-bottom: 22px; }
.trust-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.trust-chip { font-size: 14px; font-weight: 600; color: var(--c-text-2); border: 1px solid var(--c-border);
  background: var(--c-surface); padding: 9px 18px; border-radius: 999px; transition: all .2s; }
.trust-chip:hover { color: var(--c-primary); border-color: var(--c-primary); transform: translateY(-2px); }

/* ---------- 特性网格 ---------- */
.features-grid { grid-template-columns: repeat(3, 1fr); }
.feature-card { padding: 30px 26px; }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--c-shadow); border-color: var(--c-primary); }
.feat-ico { width: 54px; height: 54px; display: flex; align-items: center; justify-content: center;
  border-radius: 14px; margin-bottom: 18px; background: var(--c-primary-soft); color: var(--c-primary); }
.feat-ico svg { width: 28px; height: 28px; }
.feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--c-text-2); font-size: 15px; }

/* ---------- Split（能力详解） ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split + .split { margin-top: 96px; }
.split-media img { border-radius: 20px; box-shadow: var(--c-shadow); border: 1px solid var(--c-border); }
.split-copy .section-title { text-align: left; font-size: clamp(26px, 3.4vw, 36px); }
.split-reverse .split-media { order: 2; }
.bullet-list { list-style: none; margin-top: 28px; display: flex; flex-direction: column; gap: 18px; }
.bullet-list li { padding-left: 30px; position: relative; }
.bullet-list li::before { content: ""; position: absolute; left: 0; top: 6px; width: 14px; height: 14px; border-radius: 5px; background: var(--grad-primary); }
.bullet-list strong { display: block; font-size: 17px; margin-bottom: 2px; }
.bullet-list span { color: var(--c-text-2); font-size: 15px; }

/* ---------- Before/After 对比滑块 ---------- */
.compare-wrap { max-width: 960px; margin: 0 auto; }
.compare {
  position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--c-border); box-shadow: var(--c-shadow); user-select: none; touch-action: none; cursor: ew-resize;
}
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; pointer-events: none; }
.compare .compare-after { clip-path: inset(0 0 0 50%); }
.compare-divider { position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; background: #fff; transform: translateX(-1px); box-shadow: 0 0 12px rgba(0,0,0,.4); }
.compare-handle { position: absolute; top: 50%; left: 50%; width: 46px; height: 46px; transform: translate(-50%, -50%);
  background: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 6px 20px rgba(0,0,0,.35); color: #1d4ed8; }
.compare-tag { position: absolute; top: 16px; font-size: 12px; font-weight: 700; color: #fff; background: rgba(0,0,0,.5);
  padding: 5px 12px; border-radius: 999px; backdrop-filter: blur(4px); }
.compare-tag.left { left: 16px; }
.compare-tag.right { right: 16px; }

/* ---------- 流程步骤 ---------- */
.steps-grid { grid-template-columns: repeat(4, 1fr); }
.step { padding: 30px 24px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 18px; position: relative; overflow: hidden; transition: transform .3s, border-color .3s; }
.step:hover { transform: translateY(-6px); border-color: var(--c-primary); }
.step-no { font-size: 44px; font-weight: 900; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; opacity: .85; }
.step h3 { font-size: 18px; margin: 10px 0 8px; }
.step p { color: var(--c-text-2); font-size: 14px; }

/* ---------- 应用场景 ---------- */
.scenarios-grid { grid-template-columns: repeat(3, 1fr); }
.scenario-card { overflow: hidden; }
.scenario-card:hover { transform: translateY(-6px); box-shadow: var(--c-shadow); }
.scenario-img { height: 200px; width: 100%; object-fit: cover; }
.scenario-body { padding: 24px 26px; }
.scenario-body h3 { font-size: 20px; margin-bottom: 8px; }
.scenario-body p { color: var(--c-text-2); font-size: 15px; }

/* ---------- 优势 ---------- */
.adv-grid { grid-template-columns: repeat(3, 1fr); }
.adv { padding: 30px 26px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 18px; transition: transform .3s, border-color .3s; }
.adv:hover { transform: translateY(-6px); border-color: var(--c-primary); }
.adv-ico { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-soft); color: var(--c-primary); margin-bottom: 16px; }
.adv-ico svg { width: 26px; height: 26px; }
.adv h3 { font-size: 18px; margin-bottom: 8px; }
.adv p { color: var(--c-text-2); font-size: 14px; }

/* ---------- 作品画廊 ---------- */
.gallery-grid { grid-template-columns: repeat(4, 1fr); gap: 18px; }
.gallery-item { position: relative; border-radius: 16px; overflow: hidden; border: 1px solid var(--c-border); aspect-ratio: 3 / 4; }
.gallery-item.wide { grid-column: span 2; aspect-ratio: 16 / 10; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item .g-cap { position: absolute; inset: auto 0 0 0; padding: 28px 18px 14px; font-size: 14px; font-weight: 600; color: #fff;
  background: linear-gradient(to top, rgba(0,0,0,.7), transparent); opacity: 0; transition: opacity .3s; }
.gallery-item:hover .g-cap { opacity: 1; }

/* ---------- 客户评价 + 数据墙 ---------- */
.metrics-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 56px;
  padding: 32px 28px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 20px; }
.metric { text-align: center; position: relative; }
.metric + .metric::before { content: ""; position: absolute; left: -12px; top: 50%; transform: translateY(-50%); width: 1px; height: 46px; background: var(--c-border); }
.metric-num { font-size: clamp(30px, 4vw, 44px); font-weight: 900; line-height: 1;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.metric-label { display: block; margin-top: 10px; font-size: 14px; color: var(--c-text-2); }

.voices-grid { grid-template-columns: repeat(3, 1fr); }
.voice-card { padding: 30px 28px; display: flex; flex-direction: column; }
.voice-card:hover { transform: translateY(-6px); box-shadow: var(--c-shadow); border-color: var(--c-primary); }
.voice-stars { color: #f5a623; font-size: 16px; letter-spacing: 2px; margin-bottom: 14px; }
.voice-card blockquote { flex: 1; font-size: 15px; line-height: 1.7; color: var(--c-text); margin-bottom: 22px; }
.voice-card figcaption { display: flex; align-items: center; gap: 12px; }
.voice-avatar { width: 42px; height: 42px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; background: var(--a, var(--c-primary)); flex-shrink: 0; }
.voice-meta { display: flex; flex-direction: column; line-height: 1.3; }
.voice-meta strong { font-size: 15px; }
.voice-meta span { font-size: 13px; color: var(--c-text-3); }

/* ---------- 价格 ---------- */
.billing-toggle { display: inline-flex; align-items: center; gap: 6px; margin: 0 auto 44px; padding: 6px;
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 999px; position: relative;
  left: 50%; transform: translateX(-50%); }
.bill-opt { font-size: 14px; font-weight: 600; color: var(--c-text-2); background: transparent; border: none; cursor: pointer;
  padding: 9px 22px; border-radius: 999px; transition: color .2s, background .25s, box-shadow .25s; }
.bill-opt.active { color: #fff; background: var(--grad-primary); box-shadow: 0 8px 20px rgba(36,86,255,.32); }
.bill-save { font-size: 12px; font-weight: 700; color: var(--c-primary-2); background: var(--c-primary-soft);
  padding: 5px 12px; border-radius: 999px; margin-left: 4px; }
.price-note { font-size: 13px; color: var(--c-primary-2); margin: -14px 0 22px; min-height: 18px; opacity: 0; transition: opacity .25s; }
.pricing-grid.annual .price-note { opacity: 1; }
.pricing-grid { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.price-card { padding: 38px 30px; display: flex; flex-direction: column; position: relative; }
.price-card:hover { transform: translateY(-6px); box-shadow: var(--c-shadow); }
.price-featured { border-color: var(--c-primary); box-shadow: 0 20px 50px rgba(36,86,255,0.28); }
.price-tag { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); font-size: 12px; font-weight: 700;
  color: #fff; background: var(--grad-primary); padding: 6px 16px; border-radius: 999px; }
.price-name { font-size: 19px; font-weight: 700; }
.price-amt { margin: 18px 0 24px; display: flex; align-items: baseline; gap: 2px; }
.price-cur { font-size: 22px; font-weight: 700; color: var(--c-text-2); }
.price-val { font-size: 48px; font-weight: 900; line-height: 1; }
.price-custom { font-size: 36px; }
.price-per { font-size: 15px; color: var(--c-text-3); margin-left: 4px; }
.price-feats { list-style: none; flex: 1; display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.price-feats li { position: relative; padding-left: 28px; color: var(--c-text-2); font-size: 15px; }
.price-feats li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--c-primary); font-weight: 800; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 14px; padding: 4px 24px; transition: border-color .25s; }
.faq-item[open] { border-color: var(--c-primary); }
.faq-item summary { list-style: none; cursor: pointer; padding: 20px 0; font-size: 17px; font-weight: 600; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 24px; color: var(--c-primary); transition: transform .25s; flex-shrink: 0; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--c-text-2); padding: 0 0 22px; font-size: 15px; }

/* ---------- CTA Banner ---------- */
.cta-banner { padding: 100px 0; position: relative; overflow: hidden;
  background: linear-gradient(135deg, rgba(36,86,255,0.16), rgba(0,179,164,0.16)); }
:root[data-theme="light"] .cta-banner { background: linear-gradient(135deg, rgba(36,86,255,0.08), rgba(0,179,164,0.08)); }
.cta-inner { text-align: center; }
.cta-title { font-size: clamp(28px, 4vw, 44px); font-weight: 900; letter-spacing: -.5px; }
.cta-sub { margin-top: 16px; font-size: 18px; color: var(--c-text-2); }
.cta-actions { margin-top: 34px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-bg-2); border-top: 1px solid var(--c-border); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr 2.1fr; gap: 40px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-desc { color: var(--c-text-2); font-size: 14px; max-width: 300px; }
.footer-col h4 { font-size: 15px; margin-bottom: 18px; }
.footer-col a { display: block; color: var(--c-text-2); font-size: 14px; margin-bottom: 12px; transition: color .2s; }
.footer-col a:hover { color: var(--c-primary); }
.footer-contact { color: var(--c-text-2); font-size: 14px; line-height: 1.8; }
.footer-contact h4 { margin-bottom: 12px; }
.footer-contact a, .footer-contact p { margin-bottom: 8px; }
.footer-contact p a { display: inline; margin-bottom: 0; }
.footer-phone { display: inline-flex !important; align-items: center; gap: 10px; color: var(--c-text) !important; font-size: 28px !important; font-weight: 900; letter-spacing: .5px; line-height: 1.2; margin-bottom: 18px !important; }
.footer-phone:hover { color: var(--c-primary) !important; }
.footer-contact-line { display: flex; flex-wrap: wrap; gap: 32px; color: var(--c-text); font-weight: 600; margin-bottom: 10px; }
.footer-company { justify-content: flex-start; }
.footer-bottom { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--c-border); text-align: center; color: var(--c-text-3); font-size: 13px; line-height: 1.8; }
.footer-records { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 18px 42px; max-width: 960px; margin: 0 auto; }
.footer-records > a { color: inherit; transition: color .2s; }
.footer-records > a:hover { color: var(--c-primary); }

/* ---------- 滚动入场动效 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .voices-grid { grid-template-columns: 1fr; }
  .metrics-wall { grid-template-columns: repeat(2, 1fr); gap: 28px 24px; }
  .metric:nth-child(3)::before { display: none; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split-reverse .split-media { order: -1; }
  .split-media { order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  .section { padding: 72px 0; }
  .hero { padding: 120px 0 60px; }
  .nav-links { position: fixed; inset: 72px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--c-bg-2); border-bottom: 1px solid var(--c-border); padding: 12px 24px;
    transform: translateY(-130%); transition: transform .35s ease; box-shadow: var(--c-shadow); }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--c-border); }
  .nav-links a::after { display: none; }
  .nav-cta { display: none; }
  .menu-toggle { display: flex; }
  .features-grid, .steps-grid, .adv-grid, .scenarios-grid, .pricing-grid, .gallery-grid { grid-template-columns: 1fr; }
  .metrics-wall { grid-template-columns: 1fr 1fr; padding: 24px 18px; }
  .metric::before { display: none !important; }
  .gallery-item.wide { grid-column: span 1; aspect-ratio: 3 / 4; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-stats { gap: 28px; }
  .stat-num, .stat-suffix { font-size: 26px; }
  .brand-sub { display: none; }
  .hero-visual .float-card { left: 8px; bottom: 12px; }
}