/* =============================================================
   MessOT PMS — 官方网站样式
   设计令牌 + 组件 + 页面布局（纯原生 CSS，无构建）
   ============================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --bg: #060a14;
  --bg-soft: #0a1020;
  --bg-elev: #0e1526;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text: #e9efff;
  --text-dim: #b7c3dc;
  --muted: #8494b4;

  --accent: #4d7cff;
  --accent-2: #22d3ee;
  --accent-3: #8b5cf6;
  --gold: #ffb454;
  --success: #34d399;
  --danger: #f87171;

  --grad-brand: linear-gradient(120deg, #4d7cff 0%, #22d3ee 100%);
  --grad-warm: linear-gradient(120deg, #ffb454 0%, #ff7a59 100%);
  --grad-text: linear-gradient(100deg, #ffffff 10%, #9ec1ff 55%, #6ee7f9 95%);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.42);
  --shadow-glow: 0 24px 80px rgba(77, 124, 255, 0.28);

  --container: 1180px;
  --nav-h: 68px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 2. 基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
code { font-family: var(--font-mono); font-size: 0.9em; }
::selection { background: rgba(77, 124, 255, 0.35); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #223050; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #2d3f66; }

/* ---------- 3. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  position: relative;
  padding: 96px 0;
}
.section--tight { padding: 72px 0; }
.section--alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.section-head--left { margin-left: 0; text-align: left; }
.section-head h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  margin-bottom: 16px;
}
.section-head .lead { font-size: 17px; color: var(--muted); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 背景装饰 */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}
.bg-glow--a { width: 620px; height: 620px; background: rgba(77, 124, 255, 0.22); top: -240px; left: -160px; }
.bg-glow--b { width: 520px; height: 520px; background: rgba(34, 211, 238, 0.14); top: 40px; right: -180px; }
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 25%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 25%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}
.section > .container { position: relative; z-index: 1; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}
.btn--primary {
  background: var(--grad-brand);
  color: #05101f;
  box-shadow: 0 10px 30px rgba(77, 124, 255, 0.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(77, 124, 255, 0.5); }
.btn--ghost {
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--text);
}
.btn--ghost:hover { border-color: rgba(77, 124, 255, 0.6); background: rgba(77, 124, 255, 0.12); transform: translateY(-2px); }
.btn--sm { padding: 9px 18px; font-size: 14px; }
.btn--block { width: 100%; }

.link-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent-2); font-weight: 600; font-size: 15px;
  transition: gap 0.2s ease, color 0.2s ease;
}
.link-arrow:hover { gap: 12px; color: #67e8f9; }

/* ---------- 5. 顶部导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(6, 10, 20, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.brand__mark {
  width: 48px; height: 48px;
  border-radius: 10px;
  background: url('/assets/img/messot.png');
  background-size: cover;
  background-repeat: no-repeat;
  display: grid; place-items: center;
}
.brand__text small {
  display: block;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--muted);
  font-weight: 600;
  line-height: 1;
  margin-top: 4px;
}
.nav__links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav__link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--text-dim);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav__link:hover { color: #fff; background: var(--panel); }
.nav__link.is-active { color: #fff; background: var(--panel-strong); }
.nav__toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  align-items: center; justify-content: center;
}
.nav__toggle span {
  display: block; width: 18px; height: 2px; background: var(--text);
  position: relative; border-radius: 2px;
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px;
  background: var(--text); border-radius: 2px; transition: transform 0.25s ease;
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after { top: 6px; }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 84px) 0 84px;
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px 7px 8px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 24px;
}
.hero__badge b {
  background: var(--grad-brand);
  color: #05101f;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.hero__title {
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}
.hero__lead {
  font-size: 17.5px;
  color: var(--text-dim);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 44px; }
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.stat__num {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { font-size: 13px; color: var(--muted); margin-top: 2px; }

/* ---------- 7. 房态看板 Mock ---------- */
.board {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(20, 30, 55, 0.9), rgba(9, 14, 26, 0.95));
  box-shadow: var(--shadow), var(--shadow-glow);
  padding: 18px;
  position: relative;
  overflow: hidden;
}
.board::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.08), transparent 40%);
  pointer-events: none;
}
.board__head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}
.board__dots { display: flex; gap: 6px; }
.board__dots i { width: 9px; height: 9px; border-radius: 50%; background: #2b3a5c; display: block; }
.board__dots i:nth-child(1) { background: #ff5f57; }
.board__dots i:nth-child(2) { background: #febc2e; }
.board__dots i:nth-child(3) { background: #28c840; }
.board__title { font-size: 12.5px; color: var(--muted); font-weight: 600; letter-spacing: 0.04em; }
.board__pill {
  margin-left: auto;
  font-size: 11px; padding: 4px 10px; border-radius: 999px;
  background: rgba(52, 211, 153, 0.14); color: #6ee7b7; font-weight: 600;
}
.board__grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 7px;
}
.cell {
  aspect-ratio: 1.35 / 1;
  border-radius: 7px;
  display: grid;
  place-items: center;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: rgba(5, 12, 24, 0.82);
  position: relative;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.cell:hover { transform: scale(1.12); box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5); z-index: 2; }
.cell--vc { background: #52c41a; }
.cell--vd { background: #fadb14; }
.cell--occ { background: #4096ff; }
.cell--od { background: #ff9c4d; }
.cell--ed { background: #91d5ff; }
.cell--co { background: #ff6b6b; }
.cell--ooo { background: #8c8c8c; }
.cell--blk { background: #b37feb; }
.cell--ovs { background: #f5222d; color: #fff; }
.cell--mnt { background: #595959; color: #e6e6e6; }

.board__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.legend__item { display: flex; align-items: center; gap: 7px; font-size: 11.5px; color: var(--muted); }
.legend__dot { width: 10px; height: 10px; border-radius: 3px; }

.board__float {
  position: absolute;
  right: -14px;
  bottom: 46px;
  background: rgba(10, 16, 32, 0.94);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  animation: float 5.5s ease-in-out infinite;
}
.board__float b { display: block; font-size: 20px; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.board__float span { font-size: 11.5px; color: var(--muted); }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 7.5 内页头部 ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + 68px) 0 56px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(30px, 4.2vw, 46px); letter-spacing: -0.03em; margin-bottom: 18px; }
.page-hero p { color: var(--text-dim); max-width: 720px; font-size: 17px; }
.page-hero__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.crumb a:hover { color: var(--accent-2); }
.crumb span { margin: 0 8px; opacity: 0.5; }

/* ---------- 7.6 功能清单表 ---------- */
.feature-group + .feature-group { margin-top: 64px; }
.feature-group__head {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding-bottom: 18px; margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.feature-group__head h2 { font-size: clamp(22px, 2.6vw, 30px); }
.feature-group__head span { font-size: 14px; color: var(--muted); }
.feature-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.feature-item {
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.22s ease, background 0.22s ease;
}
.feature-item:hover { border-color: rgba(77, 124, 255, 0.45); background: var(--panel-strong); }
.feature-item h4 { font-size: 15.5px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.feature-item h4::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2); flex: none;
}
.feature-item p { font-size: 13.5px; color: var(--muted); }

/* ---------- 8. 卡片 ---------- */
.card {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.015));
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(420px circle at 100% 0%, rgba(77, 124, 255, 0.16), transparent 60%);
  opacity: 0; transition: opacity 0.3s ease;
  pointer-events: none;
}
.card:hover { transform: translateY(-6px); border-color: rgba(77, 124, 255, 0.45); box-shadow: var(--shadow); }
.card:hover::before { opacity: 1; }
.card__icon {
  width: 46px; height: 46px;
  border-radius: 13px;
  display: grid; place-items: center;
  background: rgba(77, 124, 255, 0.14);
  border: 1px solid rgba(77, 124, 255, 0.28);
  color: var(--accent-2);
  margin-bottom: 18px;
}
.card__icon svg { width: 22px; height: 22px; }
.card__title { font-size: 18px; margin-bottom: 10px; }
.card__text { font-size: 14.5px; color: var(--muted); }
.card__meta { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--text-dim);
}
.tag--accent { background: rgba(34, 211, 238, 0.12); border-color: rgba(34, 211, 238, 0.3); color: #7dd3fc; }

/* ---------- 9. 媒体图（截图/配图占位） ---------- */
.media {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(600px circle at 20% 15%, rgba(77, 124, 255, 0.25), transparent 60%),
    radial-gradient(500px circle at 85% 80%, rgba(34, 211, 238, 0.18), transparent 60%),
    linear-gradient(150deg, #101a30, #0a1120);
  min-height: 220px;
  display: grid;
  place-items: center;
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media__cap {
  position: absolute;
  left: 14px; bottom: 14px;
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(6, 10, 20, 0.72);
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
  backdrop-filter: blur(8px);
}
/* 图片缺失时的提示 */
.media.is-missing::after {
  content: attr(data-img) "  ← 待放入此图";
  font-family: var(--font-mono);
  font-size: 12px;
  color: #7dd3fc;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px dashed rgba(125, 211, 252, 0.45);
  background: rgba(6, 10, 20, 0.5);
  text-align: center;
  max-width: 80%;
}

/* ---------- 10. 分栏（图文交错） ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split--reverse .split__media { order: -1; }
.split h3 { font-size: clamp(24px, 2.6vw, 32px); margin-bottom: 16px; }
.split p + p { margin-top: 14px; }
.split__list { margin-top: 22px; display: grid; gap: 12px; }
.split__list li {
  position: relative;
  padding-left: 30px;
  font-size: 15px;
  color: var(--text-dim);
}
.split__list li::before {
  content: "";
  position: absolute; left: 0; top: 9px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.15);
  border: 1px solid rgba(34, 211, 238, 0.45);
}
.split__list li::after {
  content: "";
  position: absolute; left: 5px; top: 14px;
  width: 6px; height: 3px;
  border-left: 1.6px solid #67e8f9;
  border-bottom: 1.6px solid #67e8f9;
  transform: rotate(-45deg);
}

/* ---------- 11. 功能模块矩阵 ---------- */
.modules { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.module {
  display: flex;
  gap: 18px;
  padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}
.module:hover { border-color: rgba(77, 124, 255, 0.45); background: var(--panel-strong); transform: translateX(4px); }
.module__no {
  flex: none;
  width: 38px; height: 38px;
  border-radius: 11px;
  display: grid; place-items: center;
  font-size: 14px; font-weight: 700;
  font-family: var(--font-mono);
  color: #05101f;
  background: var(--grad-brand);
}
.module__name { font-size: 16.5px; margin-bottom: 6px; }
.module__desc { font-size: 14px; color: var(--muted); }
.module__list { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }

/* ---------- 12. 旅程时间线 ---------- */
.timeline {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 16px;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 19px; left: 6%; right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(77, 124, 255, 0.6), rgba(34, 211, 238, 0.6), transparent);
}
.step { position: relative; text-align: center; }
.step__dot {
  width: 38px; height: 38px;
  margin: 0 auto 18px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 13.5px; font-weight: 700;
  background: var(--bg-elev);
  border: 1px solid rgba(77, 124, 255, 0.5);
  color: var(--accent-2);
  position: relative; z-index: 1;
  box-shadow: 0 0 0 6px rgba(6, 10, 20, 0.9);
}
.step__title { font-size: 15.5px; margin-bottom: 8px; }
.step__text { font-size: 13.5px; color: var(--muted); }

/* ---------- 13. FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq__item { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.faq__q {
  width: 100%; text-align: left;
  padding: 20px 24px;
  display: flex; align-items: center; gap: 16px;
  font-size: 16px; font-weight: 600;
}
.faq__q i {
  margin-left: auto; flex: none;
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: grid; place-items: center;
  font-style: normal; font-size: 14px; color: var(--accent-2);
  transition: transform 0.25s ease, background 0.25s ease;
}
.faq__item.is-open .faq__q i { transform: rotate(45deg); background: rgba(77, 124, 255, 0.2); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq__a p { padding: 0 24px 22px; font-size: 14.5px; color: var(--muted); }

/* ---------- 14. CTA 面板 ---------- */
.cta {
  position: relative;
  border-radius: 28px;
  padding: 64px 48px;
  text-align: center;
  overflow: hidden;
  border: 1px solid rgba(77, 124, 255, 0.32);
  background:
    radial-gradient(700px circle at 50% 0%, rgba(77, 124, 255, 0.28), transparent 65%),
    linear-gradient(160deg, #0d1730, #080d1a);
}
.cta h2 { font-size: clamp(26px, 3.4vw, 38px); margin-bottom: 16px; }
.cta p { color: var(--text-dim); max-width: 620px; margin: 0 auto 32px; }
.cta__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 15. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 64px 0 32px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.footer__brand p { font-size: 14px; color: var(--muted); margin-top: 16px; max-width: 320px; }
.footer h4 { font-size: 14px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 18px; }
.footer__links li + li { margin-top: 11px; }
.footer__links a { font-size: 14px; color: var(--muted); transition: color 0.2s ease; }
.footer__links a:hover { color: var(--accent-2); }
.footer__bottom {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-top: 26px; font-size: 13px; color: var(--muted);
}

/* ---------- 16. 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .timeline { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 34px; }
  .timeline::before { display: none; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(6, 10, 20, 0.97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px);
    opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }
  .nav.is-open .nav__links { opacity: 1; transform: none; pointer-events: auto; }
  .nav__link { padding: 12px 14px; font-size: 16px; }
  .nav__cta { margin-top: 10px; }
  .nav__toggle { display: inline-flex; margin-left: auto; }
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split--reverse .split__media { order: 0; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .modules { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .section { padding: 68px 0; }
  .grid--4 { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: 1fr; gap: 30px; }
  .cta { padding: 46px 22px; }
  .board__grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .board__float { display: none; }
}