/* ============================================================
   Excel 表溯源 · 官网样式
   设计语言：墨岩 × 琥珀（与客户端同源）
   结构隐喻：深色外壳（导航/Hero/性能带/授权/页脚）+ 纸白内容卡（功能/流程/时间线/FAQ）
   母题：Excel 单元格网格 —— 网格底纹、公式栏章节标签、A1 单元格角标
   ============================================================ */

:root {
  --ink-900: #0E121B;      /* 最深墨岩 */
  --ink-800: #12161F;      /* 品牌墨岩 */
  --ink-700: #171C29;
  --ink-600: #1A2130;
  --line-dark: #242E48;
  --line-dark-2: #2C3856;

  --paper: #FAF9F4;        /* 纸白内容卡 */
  --paper-2: #F4F1E8;
  --paper-head: #F1EBDD;   /* 暖色表头 */
  --line-paper: #E8E2D2;

  --ink-text: #ECF0F7;
  --ink-text-2: #9AA6BE;
  --ink-text-3: #616E8B;

  --paper-text: #2B2A26;
  --paper-text-2: #6B675C;
  --paper-text-3: #9B9484;

  --amber: #E8A23B;
  --amber-2: #F2B458;
  --amber-ink: #221507;
  --amber-soft: rgba(232, 162, 59, .12);

  --green: #4CAF7D;
  --red: #E06C6C;

  --font-ui: "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Helvetica Neue", sans-serif;
  --font-mono: "Cascadia Code", "JetBrains Mono", Consolas, "Courier New", monospace;

  --radius: 14px;
  --shadow-paper: 0 18px 44px -18px rgba(43, 42, 38, .22);
  --shadow-pop: 0 30px 80px -24px rgba(0, 0, 0, .55);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-ui);
  background: var(--ink-800);
  color: var(--ink-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: rgba(232, 162, 59, .32); }
.mono { font-family: var(--font-mono); }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* 顶部磨砂导航（呼应软件标题栏） */
.nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(18, 22, 31, .84);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}
.nav.scrolled { border-bottom-color: var(--line-dark); box-shadow: 0 10px 34px -18px rgba(0, 0, 0, .7); }
.nav-inner { display: flex; align-items: center; gap: 40px; height: 64px; }
.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.brand-name { font-size: 15.5px; font-weight: 700; letter-spacing: .3px; }
.brand-name span { color: var(--amber); }
.nav-links { display: flex; gap: 30px; }
.nav-links a {
  font-size: 13.5px; color: var(--ink-text-2); letter-spacing: .3px;
  position: relative; padding: 6px 0; transition: color .2s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--amber); border-radius: 2px; transition: width .25s;
}
.nav-links a:hover { color: var(--ink-text); }
.nav-links a:hover::after { width: 100%; }

/* 通用按钮体系（与客户端按钮规范一致） */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-ui); font-size: 14px; font-weight: 600;
  border-radius: 10px; padding: 12px 26px; cursor: pointer;
  border: 1px solid transparent; transition: all .22s; white-space: nowrap;
}
.btn-amber {
  background: linear-gradient(180deg, var(--amber-2), var(--amber));
  color: var(--amber-ink);
  box-shadow: 0 8px 26px -8px rgba(232, 162, 59, .55);
}
.btn-amber:hover { transform: translateY(-2px); box-shadow: 0 14px 34px -8px rgba(232, 162, 59, .6); }
.btn-ghost { background: transparent; color: var(--ink-text-2); border-color: var(--line-dark-2); }
.btn-ghost:hover { color: var(--ink-text); border-color: var(--amber); transform: translateY(-2px); }
.btn-sm { padding: 9px 18px; font-size: 13px; border-radius: 9px; }

/* ============================ Hero ============================ */
.hero {
  position: relative; overflow: hidden;
  background: var(--ink-800);
  padding: 92px 0 110px;
}
/* 单元格网格底纹 + 琥珀辉光 */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 198, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 198, .05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(1200px 700px at 30% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(1200px 700px at 30% 0%, #000 30%, transparent 78%);
}
.hero::after {
  content: ""; position: absolute; right: -140px; top: -180px; width: 720px; height: 720px;
  background: radial-gradient(circle, rgba(232, 162, 59, .14), transparent 62%);
  pointer-events: none;
}
.hero-grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: 56px; align-items: center;
}
.hero-chip {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 1px;
  color: var(--ink-text-2); border: 1px solid var(--line-dark-2);
  background: rgba(26, 33, 48, .7); border-radius: 99px; padding: 7px 16px;
  margin-bottom: 26px;
}
.hero-chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px rgba(76, 175, 125, .9); }
.hero h1 {
  font-size: 50px; line-height: 1.22; font-weight: 800; letter-spacing: .5px;
  margin-bottom: 22px;
}
/* 琥珀荧光笔高亮（单元格选中隐喻） */
.hero h1 em {
  font-style: normal; color: var(--amber);
  background: linear-gradient(transparent 64%, rgba(232, 162, 59, .26) 0);
  padding: 0 4px; border-radius: 3px;
}
.hero-sub { font-size: 16px; color: var(--ink-text-2); max-width: 520px; margin-bottom: 34px; }
.hero-sub b { color: var(--ink-text); font-weight: 600; }
.hero-cta { display: flex; gap: 14px; margin-bottom: 40px; }
.hero-marks { display: flex; flex-wrap: wrap; gap: 10px; }
.mark {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-text-2);
  border: 1px solid var(--line-dark); background: var(--ink-600);
  border-radius: 8px; padding: 7px 13px;
}
.mark b { color: var(--amber); font-weight: 700; }

/* ---------- 纯 CSS 软件界面实拍（Hero 右侧） ---------- */
.app-shot { position: relative; animation: float 7s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.app-shot::before {
  content: ""; position: absolute; inset: -34px -44px;
  background: radial-gradient(closest-side, rgba(232, 162, 59, .17), transparent 72%);
  z-index: -1; filter: blur(6px);
}
.window {
  background: var(--ink-800); border: 1px solid var(--line-dark-2);
  border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-pop);
  font-size: 12px;
}
/* 标题栏：品牌 + 文件胶囊 + 三键 */
.win-titlebar {
  height: 40px; display: flex; align-items: center; gap: 10px;
  background: var(--ink-700); border-bottom: 1px solid var(--line-dark); padding: 0 14px;
}
.win-brand { display: flex; align-items: center; gap: 7px; font-size: 11.5px; font-weight: 700; }
.file-pill {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-text-2);
  background: var(--ink-600); border: 1px solid var(--line-dark);
  border-radius: 99px; padding: 3px 12px;
}
.win-btns { margin-left: auto; display: flex; gap: 7px; }
.win-btns i { width: 11px; height: 11px; border-radius: 50%; background: var(--line-dark-2); }
.win-btns i:first-child { background: #3E4B6E; }
/* 工具栏：琥珀主按钮 + 描边次按钮 */
.win-toolbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px;
  background: #131826; border-bottom: 1px solid var(--line-dark);
}
.tb-main {
  background: linear-gradient(180deg, var(--amber-2), var(--amber)); color: var(--amber-ink);
  font-weight: 700; font-size: 12px; border-radius: 8px; padding: 7px 18px;
  box-shadow: 0 5px 16px -5px rgba(232, 162, 59, .5);
}
.tb-outline {
  font-size: 12px; color: var(--ink-text-2); border: 1px solid var(--line-dark-2);
  border-radius: 8px; padding: 7px 14px;
}
.tb-status { margin-left: auto; font-family: var(--font-mono); font-size: 10.5px; color: var(--green); }
/* 仪表读数统计带 */
.win-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: #10141F; border-bottom: 1px solid var(--line-dark);
}
.win-stats > div { padding: 12px 8px 10px; text-align: center; border-right: 1px solid var(--line-dark); }
.win-stats > div:last-child { border-right: 0; }
.ws-num { font-family: var(--font-mono); font-size: 19px; font-weight: 700; line-height: 1.2; }
.ws-num.amber { color: var(--amber); }
.ws-label { font-size: 10px; color: var(--ink-text-3); margin-top: 2px; letter-spacing: 1px; }
/* 主体：深色侧栏 + 纸白内容卡 */
.win-body { display: flex; min-height: 238px; }
.win-side {
  width: 118px; flex: none; background: #151A28;
  border-right: 1px solid var(--line-dark); padding: 10px 0;
}
.ws-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px; font-size: 11.5px; color: var(--ink-text-2);
  border-left: 3px solid transparent; margin: 2px 0;
}
.ws-item .ct { font-family: var(--font-mono); font-size: 9.5px; color: var(--ink-text-3); }
.ws-item.on { background: var(--ink-600); color: var(--ink-text); border-left-color: var(--amber); }
.win-main { flex: 1; padding: 12px; background: #0F131C; }
.sheet-card {
  background: var(--paper); border-radius: 10px; overflow: hidden;
  box-shadow: 0 14px 34px -14px rgba(0, 0, 0, .5); height: 100%;
  display: flex; flex-direction: column;
}
.sc-head {
  display: flex; background: var(--paper-head); color: #5A5142;
  font-size: 10.5px; font-weight: 600; padding: 0 12px;
}
.sc-head span { padding: 8px 0; flex: 1; }
.sc-head .c1 { flex: 0 0 52px; }
.sc-row {
  display: flex; padding: 0 12px; font-family: var(--font-mono); font-size: 10.5px;
  color: #4E4A40; border-bottom: 1px solid #F1EDE1; flex: 1; align-items: center;
}
.sc-row:nth-child(even) { background: #F6F3EA; }
.sc-row span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; padding: 8px 0; }
.sc-row .c1 { flex: 0 0 52px; color: #9B9484; }
.sc-row .ref { color: var(--amber); font-weight: 700; }
.sc-row.sel {
  position: relative; background: #FBF3E2; border-bottom-color: #F3E7CC;
}
.sc-row.sel::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--amber);
}
/* Hero 底部渐隐过渡 */
.hero-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 90px; z-index: 1;
  background: linear-gradient(transparent, var(--ink-900)); pointer-events: none;
}

/* ============================ 章节公共 ============================ */
.section { padding: 96px 0; position: relative; }
.section-paper { background: var(--paper); color: var(--paper-text); }
.section-ink { background: var(--ink-900); }
.section-paper .wrap { position: relative; z-index: 2; }

/* 公式栏章节标签 fx = SECTION() */
.fx-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .5px;
  border-radius: 8px; padding: 6px 14px; margin-bottom: 18px;
  border: 1px solid var(--line-dark-2); color: var(--amber);
  background: var(--amber-soft);
}
.section-paper .fx-chip { border-color: rgba(232, 162, 59, .4); background: rgba(232, 162, 59, .1); }
.fx-chip .fx { font-weight: 800; font-style: italic; }
.sec-head { max-width: 640px; margin-bottom: 52px; }
.sec-head h2 { font-size: 32px; font-weight: 800; line-height: 1.3; letter-spacing: .3px; }
.sec-head p { margin-top: 14px; font-size: 15px; }
.section-ink .sec-head p { color: var(--ink-text-2); }
.section-paper .sec-head p { color: var(--paper-text-2); }

/* ============================ 功能特性 ============================ */
/* 纸白区：淡网格底纹 */
.section-paper::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(43, 42, 38, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 42, 38, .035) 1px, transparent 1px);
  background-size: 44px 44px;
}
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; position: relative; z-index: 2; }
.fcard {
  position: relative; background: #FFFDF8; border: 1px solid var(--line-paper);
  border-radius: var(--radius); padding: 28px 26px 24px;
  box-shadow: var(--shadow-paper);
  transition: transform .28s, box-shadow .28s, border-color .28s;
}
.fcard:hover {
  transform: translateY(-6px); border-color: rgba(232, 162, 59, .55);
  box-shadow: 0 26px 54px -18px rgba(43, 42, 38, .28);
}
/* A1 单元格角标 */
.fcard::after {
  content: attr(data-cell); position: absolute; top: 15px; right: 17px;
  font-family: var(--font-mono); font-size: 11px; color: var(--paper-text-3); opacity: .75;
}
.fcard .ficon {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(160deg, rgba(232, 162, 59, .16), rgba(232, 162, 59, .07));
  border: 1px solid rgba(232, 162, 59, .3); color: #C77E1A; margin-bottom: 16px;
}
.fcard h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 9px; }
.fcard p { font-size: 13.5px; color: var(--paper-text-2); line-height: 1.8; }
.fcard p code {
  font-family: var(--font-mono); font-size: 12px; color: #C77E1A;
  background: rgba(232, 162, 59, .1); border-radius: 5px; padding: 1px 6px;
}

/* ============================ 性能数据带 ============================ */
.perf { background: var(--ink-800); position: relative; overflow: hidden; }
.perf::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 198, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 198, .045) 1px, transparent 1px);
  background-size: 44px 44px;
}
.perf-grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.perf-item { text-align: center; padding: 20px 10px; border-radius: var(--radius); border: 1px solid var(--line-dark); background: rgba(23, 28, 41, .72); transition: border-color .25s, transform .25s; }
.perf-item:hover { border-color: rgba(232, 162, 59, .45); transform: translateY(-4px); }
.perf-num {
  font-family: var(--font-mono); font-size: 44px; font-weight: 800; line-height: 1.15;
  color: var(--amber); letter-spacing: -1px;
}
.perf-num small { font-size: 22px; font-weight: 700; margin-left: 2px; }
.perf-label { font-size: 13.5px; color: var(--ink-text); font-weight: 600; margin-top: 8px; }
.perf-desc { font-size: 12px; color: var(--ink-text-3); margin-top: 3px; }

/* ============================ 工作方式 ============================ */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; position: relative; z-index: 2; }
.step {
  position: relative; background: #FFFDF8; border: 1px solid var(--line-paper);
  border-radius: var(--radius); padding: 30px 26px; box-shadow: var(--shadow-paper);
}
.step-no {
  font-family: var(--font-mono); font-size: 13px; font-weight: 800; color: var(--amber-ink);
  background: linear-gradient(180deg, var(--amber-2), var(--amber));
  display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 12px;
  box-shadow: 0 8px 20px -6px rgba(232, 162, 59, .5); margin-bottom: 18px;
}
.step h3 { font-size: 17px; font-weight: 700; margin-bottom: 9px; }
.step p { font-size: 13.5px; color: var(--paper-text-2); }
.step::after {  /* 步骤连接箭头 */
  content: "→"; position: absolute; right: -19px; top: 46%;
  font-size: 18px; color: var(--paper-text-3); z-index: 3;
}
.step:last-child::after { display: none; }

/* ============================ 授权与安全 ============================ */
.lic-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.sec-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.sec-chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; color: var(--ink-text-2);
  border: 1px solid var(--line-dark-2); background: var(--ink-700);
  border-radius: 9px; padding: 8px 14px;
}
.sec-chip svg { color: var(--green); flex: none; }
.lic-note { margin-top: 26px; font-size: 12.5px; color: var(--ink-text-3); line-height: 1.9; }
/* 套餐卡（纸白浮于墨岩之上，呼应软件内容卡） */
.plans { display: grid; grid-template-columns: 1fr 1.12fr; gap: 20px; }
.plan {
  position: relative; background: var(--paper); color: var(--paper-text);
  border-radius: 16px; padding: 30px 28px; box-shadow: var(--shadow-pop);
  border: 1px solid rgba(255, 255, 255, .5);
}
.plan.hot { outline: 1.5px solid var(--amber); outline-offset: -1.5px; }
.plan-badge {
  position: absolute; top: -13px; left: 26px;
  background: linear-gradient(180deg, var(--amber-2), var(--amber)); color: var(--amber-ink);
  font-size: 11.5px; font-weight: 800; letter-spacing: 1px;
  border-radius: 99px; padding: 5px 15px; box-shadow: 0 8px 20px -6px rgba(232, 162, 59, .55);
}
.plan h3 { font-size: 16px; font-weight: 700; color: var(--paper-text-2); }
.plan .price { display: flex; align-items: baseline; gap: 5px; margin: 13px 0 4px; }
.plan .price .num { font-family: var(--font-mono); font-size: 44px; font-weight: 800; letter-spacing: -1px; }
.plan.hot .price .num { color: #C77E1A; }
.plan .price .unit { font-size: 13px; color: var(--paper-text-3); }
.plan ul { list-style: none; margin: 18px 0 0; border-top: 1px dashed var(--line-paper); padding-top: 16px; }
.plan li {
  font-size: 13.5px; color: var(--paper-text-2); padding: 5px 0 5px 24px; position: relative;
}
.plan li::before {
  content: ""; position: absolute; left: 2px; top: 12px; width: 13px; height: 8px;
  border-left: 2.5px solid var(--amber); border-bottom: 2.5px solid var(--amber);
  transform: rotate(-45deg) translateY(-2px);
}
/* 套餐卡购买按钮（描边默认 / 推荐卡实底） */
.plan-buy {
  display: block; text-align: center; margin-top: 22px; padding: 13px;
  border: 1.5px solid var(--amber); border-radius: 10px;
  font-size: 14px; font-weight: 800; letter-spacing: 2px; color: #C77E1A;
  transition: background .2s, color .2s, transform .2s, box-shadow .2s;
}
.plan-buy:hover { background: var(--amber-soft); transform: translateY(-2px); }
.plan-buy.solid {
  background: linear-gradient(180deg, var(--amber-2), var(--amber)); color: var(--amber-ink);
  border-color: transparent; box-shadow: 0 10px 22px -8px rgba(232, 162, 59, .6);
}
.plan-buy.solid:hover { transform: translateY(-2px); box-shadow: 0 14px 26px -8px rgba(232, 162, 59, .7); }
/* 联系购买卡（墨岩卡） */
.contact-card {
  margin-top: 20px; border: 1px solid var(--line-dark-2); border-radius: 16px;
  background: linear-gradient(150deg, var(--ink-600), var(--ink-700));
  padding: 28px; display: flex; gap: 26px; align-items: center; flex-wrap: wrap;
}
.contact-card .cc-label { font-size: 13px; color: var(--ink-text-3); letter-spacing: 2px; margin-bottom: 6px; }
.contact-card .cc-value { font-size: 20px; font-weight: 800; color: var(--amber); letter-spacing: .5px; word-break: break-all; }
.contact-card .cc-flow { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.contact-card .cc-flow span {
  font-size: 12.5px; color: var(--ink-text-2); border: 1px solid var(--line-dark);
  background: rgba(18, 22, 31, .6); border-radius: 99px; padding: 6px 15px;
}
.contact-card .cc-flow i { color: var(--amber); font-style: normal; }

/* ============================ 版本历程 ============================ */
.timeline { position: relative; z-index: 2; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--line-paper) 92%);
  border-radius: 2px;
}
.tl-item { position: relative; padding: 0 0 30px 22px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -25px; top: 7px; width: 12px; height: 12px;
  border-radius: 50%; background: #FFFDF8; border: 3px solid var(--amber);
  box-shadow: 0 0 0 4px rgba(232, 162, 59, .16);
}
.tl-ver { font-family: var(--font-mono); font-size: 13px; font-weight: 800; color: #C77E1A; letter-spacing: .5px; }
.tl-title { font-size: 15.5px; font-weight: 700; margin: 3px 0 4px; }
.tl-desc { font-size: 13px; color: var(--paper-text-2); max-width: 720px; }

/* ============================ FAQ ============================ */
.faq { max-width: 820px; position: relative; z-index: 2; }
.faq details {
  background: #FFFDF8; border: 1px solid var(--line-paper); border-radius: 12px;
  box-shadow: var(--shadow-paper); margin-bottom: 14px; overflow: hidden;
  transition: border-color .25s;
}
.faq details[open] { border-color: rgba(232, 162, 59, .5); }
.faq summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 14px;
  padding: 19px 24px; font-size: 15px; font-weight: 600; user-select: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "+"; font-family: var(--font-mono); font-size: 19px; font-weight: 700; color: var(--amber);
  width: 26px; height: 26px; border: 1px solid rgba(232, 162, 59, .4); border-radius: 8px;
  display: grid; place-items: center; flex: none; transition: transform .25s;
}
.faq details[open] summary::before { transform: rotate(45deg); }
.faq .faq-body { padding: 0 24px 20px 64px; font-size: 13.5px; color: var(--paper-text-2); line-height: 1.9; }
.faq .faq-body code {
  font-family: var(--font-mono); font-size: 12px; color: #C77E1A;
  background: rgba(232, 162, 59, .1); border-radius: 5px; padding: 1px 6px;
}

/* ============================ 页脚 ============================ */
.footer { background: var(--ink-800); border-top: 1px solid var(--line-dark); padding: 64px 0 0; position: relative; }
.footer::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(148, 163, 198, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 198, .04) 1px, transparent 1px);
  background-size: 44px 44px;
}
.foot-grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 44px; padding-bottom: 48px;
}
.foot-brand p { font-size: 13px; color: var(--ink-text-3); margin-top: 14px; max-width: 380px; }
.foot-h { font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--ink-text-2); margin-bottom: 16px; }
.foot-links { display: flex; flex-direction: column; gap: 11px; }
.foot-links a { font-size: 13.5px; color: var(--ink-text-3); transition: color .2s; }
.foot-links a:hover { color: var(--amber); }
.foot-contact { font-size: 14px; color: var(--ink-text); line-height: 2; }
.foot-contact b { color: var(--amber); font-size: 16px; }
.foot-bottom {
  position: relative; z-index: 2;
  border-top: 1px solid var(--line-dark); padding: 20px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 12px; color: var(--ink-text-3);
}
.foot-bottom .mono { letter-spacing: 1px; }

/* ============================ 动效 ============================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .75s cubic-bezier(.2, .65, .25, 1), transform .75s cubic-bezier(.2, .65, .25, 1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .app-shot { animation: none; }
}

/* ============================ 响应式 ============================ */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 64px; }
  .hero h1 { font-size: 42px; }
  .app-shot { max-width: 560px; }
  .features, .steps { grid-template-columns: repeat(2, 1fr); }
  .perf-grid { grid-template-columns: repeat(2, 1fr); }
  .lic-grid { grid-template-columns: 1fr; }
  .step::after { display: none; }
}
@media (max-width: 760px) {
  .wrap { padding: 0 20px; }
  .nav-links { display: none; }
  .hero { padding: 60px 0 80px; }
  .hero h1 { font-size: 34px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .features, .steps, .plans { grid-template-columns: 1fr; }
  .section { padding: 68px 0; }
  .sec-head h2 { font-size: 26px; }
  .perf-num { font-size: 36px; }
  .foot-grid { grid-template-columns: 1fr; gap: 32px; }
  .win-stats { grid-template-columns: repeat(2, 1fr); }
  .win-stats > div:nth-child(2) { border-right: 0; }
}