/* ============================================================
   千面智语 · AI 数字人直播训练平台 — 功能演示站
   设计语言参考：Specia1ne（暖米白 + 电光钴蓝 + 超大编辑排版 + 连续轴线）
   ============================================================ */

/* ---------- 字体 ---------- */
@import url("fonts.css");

/* ---------- 设计变量 ---------- */
:root {
  --paper: #F2F1EB;
  --paper-hi: #F7F6F1;
  --blue: #1D39F5;
  --blue-deep: #1428C9;
  --ink: #101014;
  --ink-70: rgba(16, 16, 20, .70);
  --ink-60: rgba(16, 16, 20, .60);
  --ink-40: rgba(16, 16, 20, .40);
  --ink-25: rgba(16, 16, 20, .25);
  --line: rgba(16, 16, 20, .14);
  --line-soft: rgba(16, 16, 20, .08);
  --blue-soft: rgba(29, 57, 245, .08);

  --axis: 57vw;                       /* 全局垂直轴线位置 */
  --pad: clamp(20px, 3.2vw, 64px);    /* 内容左右留白 */
  --hero-pad-x: clamp(20px, 4.7vw, 92px);
  --hero-pad-y: clamp(56px, 12vh, 168px);
  --stripe-w: clamp(56px, 6.5vw, 148px);

  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, "QM Sans SC", "Microsoft YaHei", monospace;
  --sans: "Inter", "QM Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --disp: "Inter Tight", "Inter", "QM Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.75;
  font-feature-settings: "ss01" on, "cv05" on;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-transitioning { cursor: progress; }

::selection { background: var(--blue); color: var(--paper-hi); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb { background: rgba(29, 57, 245, .55); border: 3px solid var(--paper); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 800; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 2px;
}
.section--blue :focus-visible { outline-color: var(--paper-hi); }

/* ---------- 分段轴线（仅出现在与内容对齐的区块，随滚动绘制） ---------- */
.axis-seg {
  position: absolute;
  top: 0; bottom: 0;
  width: 1px;
  background: rgba(29, 57, 245, .14);
  pointer-events: none;
  z-index: 1;
}
.axis-seg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(29, 57, 245, .34);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 1.2s var(--ease-out) .12s;
}
.axis-seg.is-in::after { transform: scaleY(1); }
.section--blue .axis-seg { background: rgba(242, 241, 235, .14); }
.section--blue .axis-seg::after { background: rgba(242, 241, 235, .42); }

/* 行列表轴线：与行编号对齐，并跟随当前行滑动 */
.rows { position: relative; }
.rows .axis-seg { left: calc(var(--axis) - var(--pad)); }
.rows .axis-seg i {
  position: absolute;
  left: -1.5px;
  top: 0;
  width: 4px;
  height: 42px;
  background: var(--blue);
  opacity: 0;
  transform: translateY(0);
  transition: transform .55s var(--ease-out), opacity .4s var(--ease);
}
.rows .axis-seg.is-on i { opacity: 1; }
.section--blue .rows .axis-seg i { background: var(--paper-hi); }

/* 分栏区块轴线：与 57vw 处的栏边界对齐 */
[data-axis-line] { position: relative; }
[data-axis-line] .axis-seg { left: var(--axis); }
[data-axis-line="inset"] .axis-seg { left: calc(var(--axis) - var(--pad)); }

/* ---------- 版式工具 ---------- */
.mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
  line-height: 1.6;
}
.k {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.sect-label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.sect-label .num { color: var(--blue); font-weight: 500; }
.sect-label .sep { color: var(--ink-25); }
.sect-label .cn { letter-spacing: .2em; }

.hud {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-40);
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.hud b { color: var(--ink); font-weight: 500; }
.hud .of { color: var(--ink-25); }

.h2 {
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(30px, 3.35vw, 64px);
  line-height: 1.14;
  letter-spacing: -.012em;
  margin: 18px 0 0;
  max-width: 17em;
}
.h2 .thin { color: var(--ink-25); }

.lede {
  color: var(--ink-60);
  font-size: clamp(14px, 1.05vw, 16.5px);
  line-height: 1.8;
  max-width: 44ch;
  text-align: right;
  margin-left: auto;
}
.lede strong { color: var(--ink); font-weight: 600; }

.body-text { color: var(--ink-60); max-width: 62ch; line-height: 1.85; }
.body-text strong { color: var(--ink); font-weight: 600; }

.hair { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ---------- 页面骨架 ---------- */
main { display: block; }

.section {
  position: relative;
  padding: clamp(64px, 10vh, 132px) var(--pad);
}
.section--tight { padding-top: clamp(40px, 6vh, 72px); padding-bottom: clamp(40px, 6vh, 72px); }
.section--blue {
  background: var(--blue);
  color: var(--paper-hi);
  --ink: #F2F1EB;
  --ink-70: rgba(242, 241, 235, .78);
  --ink-60: rgba(242, 241, 235, .66);
  --ink-40: rgba(242, 241, 235, .48);
  --ink-25: rgba(242, 241, 235, .30);
  --line: rgba(242, 241, 235, .20);
  --line-soft: rgba(242, 241, 235, .12);
  --blue-soft: rgba(242, 241, 235, .10);
}
.section--blue .sect-label .num { color: var(--paper-hi); }

.sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 80px);
  align-items: end;
  margin-bottom: clamp(36px, 6vh, 72px);
}
.sec-head .right { display: flex; justify-content: flex-end; }

/* 页首（二级页面） */
.phead {
  padding: clamp(110px, 17vh, 200px) var(--pad) clamp(36px, 6vh, 72px);
  border-bottom: 1px solid var(--line);
}
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: clamp(26px, 5vh, 56px);
}
.crumbs a { transition: color .3s; }
.crumbs a:hover { color: var(--blue); }
.crumbs .here { color: var(--ink); }
.phead h1 {
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(38px, 5.4vw, 104px);
  line-height: 1.08;
  letter-spacing: -.018em;
  margin: 20px 0 0;
  max-width: 16em;
}
.phead-foot {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(20px, 4vw, 72px);
  align-items: end;
  margin-top: clamp(28px, 4vh, 52px);
}
.phead-foot .lede { text-align: right; }

/* ---------- 子导航（二级菜单） ---------- */
.subnav {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  gap: clamp(16px, 2.4vw, 42px);
  padding: 15px var(--pad);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}
.subnav::-webkit-scrollbar { display: none; }
.subnav a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-40);
  white-space: nowrap;
  transition: color .3s var(--ease);
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.subnav a .n { color: var(--ink-25); transition: color .3s; }
.subnav a:hover, .subnav a.is-active { color: var(--blue); }
.subnav a:hover .n, .subnav a.is-active .n { color: var(--blue); }

/* ---------- 行列表（Work Hover System） ---------- */
.rows { border-top: 1px solid var(--line); }
.row {
  position: relative;
  display: grid;
  grid-template-columns: calc(var(--axis) - var(--pad)) minmax(0, 1fr);
  align-items: center;
  min-height: clamp(84px, 11.5vh, 150px);
  border-bottom: 1px solid var(--line);
  transition: background .45s var(--ease);
}
a.row { cursor: pointer; }
.row-left {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding-right: clamp(14px, 1.6vw, 28px);
  min-width: 0;
}
.row-title {
  font-family: var(--disp);
  font-weight: 700;
  font-size: clamp(23px, 2.55vw, 50px);
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--ink-25);
  transition: color .45s var(--ease), transform .6s var(--ease-out);
  text-align: right;
  max-width: 100%;
}
.row-right {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.8vw, 32px);
  padding-right: clamp(4px, .6vw, 12px);
  min-width: 0;
}
.row-num {
  flex: none;
  width: 40px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink-25);
  color: var(--ink-40);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  transition: background .4s var(--ease), color .4s var(--ease), border-color .4s var(--ease), transform .5s var(--ease-out);
}
.row-desc {
  color: var(--ink-40);
  font-size: clamp(13px, 1vw, 15.5px);
  line-height: 1.7;
  max-width: 46ch;
  transition: color .45s var(--ease);
}
.row-desc strong { color: var(--ink-70); font-weight: 600; }
.row-arrow {
  margin-left: auto;
  flex: none;
  font-size: 20px;
  color: var(--blue);
  opacity: 0;
  transform: translate(-8px, 8px);
  transition: opacity .4s var(--ease), transform .5s var(--ease-out);
}
.row.is-active { background: var(--blue-soft); }
.row.is-active .row-title { color: var(--ink); transform: translateX(-10px); }
.row.is-active .row-num { background: var(--blue); border-color: var(--blue); color: #fff; transform: translateX(2px); }
.row.is-active .row-desc { color: var(--ink-60); }
.row.is-active .row-arrow { opacity: 1; transform: translate(0, 0); }
.section--blue .row.is-active { background: rgba(242, 241, 235, .07); }
.section--blue .row.is-active .row-num { background: var(--paper-hi); border-color: var(--paper-hi); color: var(--blue); }
.section--blue .row-arrow { color: var(--paper-hi); }

/* ---------- 数据 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat {
  padding: clamp(22px, 3.4vh, 40px) clamp(16px, 2vw, 36px) clamp(24px, 3.6vh, 44px) 0;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}
.stat:last-child { border-right: 0; }
.stat-num {
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(38px, 4.4vw, 84px);
  line-height: .95;
  letter-spacing: -.03em;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.stat-num .unit { font-size: .38em; letter-spacing: 0; color: var(--blue); font-weight: 700; }
.stat-num .pre { font-size: .5em; color: var(--ink-40); font-weight: 700; }
.stat-label { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-40); }
.stat-note { color: var(--ink-60); font-size: clamp(12.5px, .95vw, 14.5px); line-height: 1.7; }

/* ---------- 卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.card {
  position: relative;
  background: var(--paper);
  padding: clamp(22px, 2.3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 1.8vh, 22px);
  min-height: clamp(280px, 38vh, 380px);
  transition: background .5s var(--ease), color .5s var(--ease);
}
.card--link { cursor: pointer; }
.card--link:hover, .card--link:focus-visible { background: var(--blue); color: var(--paper-hi); }
.card--link:hover .card-idx, .card--link:hover .card-tag, .card--link:hover .card-list li, .card--link:hover .card-kicker { color: rgba(242, 241, 235, .72); }
.card--link:hover .card-list li { border-color: rgba(242, 241, 235, .22); }
.card--link:hover .card-title { color: var(--paper-hi); }
.card--link:hover .card-arrow { opacity: 1; transform: translate(0, 0); }
.card-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.card-idx { font-family: var(--mono); font-size: 11px; letter-spacing: .13em; color: var(--ink-40); transition: color .4s; }
.card-arrow { font-size: 18px; color: currentColor; opacity: 0; transform: translate(-6px, 6px); transition: opacity .4s var(--ease), transform .5s var(--ease-out); }
.card-title { font-family: var(--disp); font-weight: 800; font-size: clamp(22px, 1.9vw, 32px); line-height: 1.18; letter-spacing: -.012em; }
.card-kicker { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-40); transition: color .4s; }
.card-tag { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-60); transition: color .4s; }
.card-tag::before { content: ""; width: 7px; height: 7px; background: var(--blue); }
.card--link:hover .card-tag::before { background: var(--paper-hi); }
.card-list { margin-top: auto; border-top: 1px solid var(--line); }
.card-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-60);
  font-size: clamp(12.5px, .95vw, 14.5px);
  line-height: 1.6;
  transition: color .4s, border-color .4s;
}
.card-list li span:last-child { text-align: right; color: var(--ink); font-weight: 600; white-space: nowrap; }
.card--link:hover .card-list li span:last-child { color: var(--paper-hi); }
.card-price { font-family: var(--disp); font-weight: 800; font-size: clamp(28px, 2.6vw, 44px); line-height: 1; letter-spacing: -.02em; }
.card-price .per { font-size: .42em; font-weight: 600; color: var(--ink-40); letter-spacing: 0; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border-top: 1px solid var(--line); }
.table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: clamp(13px, 1vw, 15px);
  line-height: 1.7;
}
.table th {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-40);
  text-align: left;
  padding: 14px 18px 14px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: bottom;
  white-space: nowrap;
}
.table td {
  padding: 18px 18px 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-60);
  vertical-align: top;
}
.table td:first-child { color: var(--ink); font-weight: 600; padding-left: 2px; }
.table tbody tr { transition: background .35s var(--ease); }
.table tbody tr:hover { background: var(--blue-soft); }
.table .num-cell { font-family: var(--mono); font-size: .95em; letter-spacing: .02em; }
.table .hl { color: var(--blue); font-weight: 700; }
.section--blue .table .hl { color: var(--paper-hi); }
.table-note { font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; color: var(--ink-40); padding-top: 14px; line-height: 1.9; }

/* ---------- 步骤 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.step {
  position: relative;
  padding: clamp(16px, 1.8vw, 26px) clamp(12px, 1.4vw, 22px) clamp(20px, 2.4vh, 32px);
  border-right: 1px solid var(--line);
  min-height: clamp(150px, 22vh, 210px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background .45s var(--ease), color .45s var(--ease);
}
.step:last-child { border-right: 0; }
.step-num { font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; color: var(--ink-40); transition: color .4s; }
.step-name { font-family: var(--disp); font-weight: 700; font-size: clamp(15px, 1.15vw, 19px); line-height: 1.3; letter-spacing: -.005em; }
.step-desc { color: var(--ink-40); font-size: clamp(11.5px, .82vw, 13px); line-height: 1.65; margin-top: auto; transition: color .4s; }
.step.is-active { background: var(--blue); color: var(--paper-hi); }
.step.is-active .step-num, .step.is-active .step-desc { color: rgba(242, 241, 235, .72); }

/* ---------- 定义双栏 ---------- */
.duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.duo > div { background: var(--paper); padding: clamp(20px, 2.2vw, 34px); }
.duo .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .13em; text-transform: uppercase; color: var(--ink-40); margin-bottom: 12px; }
.duo .v { color: var(--ink-60); line-height: 1.8; font-size: clamp(13px, 1vw, 15px); }

/* ---------- 数字/条形可视化 ---------- */
.bars { display: flex; flex-direction: column; gap: 18px; }
.bar-row { display: grid; grid-template-columns: minmax(120px, 190px) minmax(0, 1fr) auto; gap: clamp(12px, 1.6vw, 26px); align-items: center; }
.bar-label { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-60); }
.bar-track { position: relative; height: 26px; background: var(--blue-soft); overflow: hidden; }
.bar-fill {
  position: absolute; inset: 0 auto 0 0;
  width: 0;
  background: var(--blue);
  transition: width 1.2s var(--ease-out);
}
.bar-fill--dim { background: var(--ink-25); }
.bar-val { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--ink); }
.section--blue .bar-track { background: rgba(242, 241, 235, .12); }
.section--blue .bar-fill { background: var(--paper-hi); }
.section--blue .bar-fill--dim { background: rgba(242, 241, 235, .4); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 4px 0;
  transition: color .35s var(--ease);
  position: relative;
}
.btn .br { color: var(--blue); transition: transform .45s var(--ease-out); display: inline-block; }
.btn:hover { color: var(--blue); }
.btn:hover .br:first-child { transform: translateX(-4px); }
.btn:hover .br:last-child { transform: translateX(4px); }
.section--blue .btn .br, .section--blue .btn:hover { color: var(--paper-hi); }

.btn-solid {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  background: var(--blue);
  color: var(--paper-hi);
  padding: 16px 26px;
  transition: background .35s var(--ease), transform .45s var(--ease-out), letter-spacing .45s var(--ease);
}
.btn-solid:hover { background: var(--blue-deep); letter-spacing: .18em; }
.btn-solid:disabled { opacity: .42; cursor: not-allowed; }
.btn-solid:disabled:hover { background: var(--blue); letter-spacing: .14em; }
.btn-solid .ar { transition: transform .45s var(--ease-out); }
.btn-solid:hover .ar { transform: translate(4px, -4px); }
.section--blue .btn-solid { background: var(--paper-hi); color: var(--blue); }
.section--blue .btn-solid:hover { background: #fff; }

/* ---------- 标签 ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-60);
  border: 1px solid var(--line);
  padding: 8px 12px;
  transition: color .3s, border-color .3s;
}
.chip:hover { color: var(--blue); border-color: var(--blue); }
.chip--blue { color: var(--blue); border-color: rgba(29, 57, 245, .4); }
.chip--fill { background: var(--blue); border-color: var(--blue); color: #fff; }

/* ---------- 技术轨迹（mono 日志面板） ---------- */
.trace {
  background: var(--ink);
  color: #E9E7DF;
  font-family: var(--mono);
  font-size: clamp(11px, .82vw, 12.5px);
  line-height: 2.05;
  letter-spacing: .02em;
  padding: clamp(18px, 2vw, 30px) clamp(18px, 2.2vw, 34px);
  overflow-x: auto;
}
.trace .row-line { display: flex; gap: 14px; white-space: nowrap; }
.trace .t { color: #7C7A94; flex: none; }
.trace .k { color: #9BA7FF; flex: none; }
.trace .ok { color: #86E3A8; }
.trace .warn { color: #FFC46B; }
.trace .dim { color: #8B8998; }
.trace-title {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.section--blue .trace { background: rgba(16, 16, 20, .28); }

/* ---------- 引述 ---------- */
.quote {
  border-left: 1px solid var(--line);
  padding-left: clamp(18px, 2.4vw, 36px);
  max-width: 66ch;
}
.quote p { font-size: clamp(15px, 1.25vw, 19px); line-height: 1.85; color: var(--ink-70); }
.quote cite { display: block; margin-top: 16px; font-style: normal; }

/* ---------- 提示条 ---------- */
.notice {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  padding: clamp(16px, 1.8vw, 24px) clamp(16px, 2vw, 28px);
  background: var(--blue-soft);
  color: var(--ink-70);
  font-size: clamp(12.5px, .98vw, 14.5px);
  line-height: 1.8;
}
.notice .ico { font-family: var(--mono); color: var(--blue); font-size: 11px; letter-spacing: .1em; padding-top: 3px; white-space: nowrap; }
.notice strong { color: var(--ink); }
.section--blue .notice { background: rgba(242, 241, 235, .08); }
.section--blue .notice .ico { color: var(--paper-hi); }

/* ---------- 固定顶栏 ---------- */
.topbar-fixed {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px var(--pad);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px) saturate(1.25);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
  border-bottom: 1px solid var(--line);
  transform: translateY(-102%);
  transition: transform .6s var(--ease-out);
}
.topbar-fixed.is-shown { transform: none; }
.topbar-fixed .tb-left { display: flex; align-items: center; gap: 16px; min-width: 0; }
.topbar-fixed .tb-page {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-40);
  padding-left: 16px;
  border-left: 1px solid var(--line);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar-fixed .tb-page b { color: var(--blue); font-weight: 500; }
@media (max-width: 760px) { .topbar-fixed .tb-page { display: none; } }

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(17px, 1.25vw, 21px);
  letter-spacing: -.01em;
  line-height: 1;
  white-space: nowrap;
}
.brand .mark { width: 9px; height: 9px; background: var(--blue); flex: none; }
.brand .en { font-family: var(--mono); font-size: 9.5px; letter-spacing: .18em; color: var(--ink-40); font-weight: 400; text-transform: uppercase; }
.section--blue .brand .en { color: rgba(242, 241, 235, .6); }

/* ---------- 菜单按钮 ---------- */
.menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink);
  transition: color .3s;
}
.menu-btn:hover { color: var(--blue); }
.grid-icon { display: grid; grid-template-columns: repeat(2, 5px); grid-template-rows: repeat(2, 5px); gap: 3px; }
.grid-icon i { background: var(--blue); transition: transform .5s var(--ease-out), background .4s; }
.menu-btn.is-open { color: var(--paper-hi); }
.menu-btn.is-open .grid-icon i { background: var(--paper-hi); }
.menu-btn.is-open .grid-icon i:nth-child(1) { transform: translate(4px, 4px); }
.menu-btn.is-open .grid-icon i:nth-child(2) { transform: translate(-4px, 4px); }
.menu-btn.is-open .grid-icon i:nth-child(3) { transform: translate(4px, -4px); }
.menu-btn.is-open .grid-icon i:nth-child(4) { transform: translate(-4px, -4px); }

/* ---------- 全屏菜单 ---------- */
.menu {
  position: fixed;
  inset: 0;
  z-index: 120;
  background: var(--blue);
  color: var(--paper-hi);
  clip-path: inset(0 0 100% 0);
  transition: clip-path .85s var(--ease-out);
  display: flex;
  flex-direction: column;
  visibility: hidden;
}
.menu.is-open { clip-path: inset(0 0 0 0); visibility: visible; }
.menu.is-animating { visibility: visible; }
.menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--pad);
  border-bottom: 1px solid rgba(242, 241, 235, .2);
}
.menu-body {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, calc(var(--axis) - var(--pad))) minmax(0, 1fr);
  overflow: hidden;
}
.menu-primary {
  padding: clamp(20px, 4vh, 48px) clamp(20px, 2.4vw, 40px) clamp(20px, 4vh, 48px) var(--pad);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}
.menu-item {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 1.4vw, 22px);
  padding: clamp(6px, 1vh, 12px) 0;
  color: rgba(242, 241, 235, .45);
  transition: color .4s var(--ease), transform .55s var(--ease-out);
  cursor: pointer;
  background: none;
  text-align: left;
  width: 100%;
}
.menu-item .mi-num { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; flex: none; padding-top: .5em; }
.menu-item .mi-text { font-family: var(--disp); font-weight: 800; font-size: clamp(26px, 3.1vw, 54px); line-height: 1.08; letter-spacing: -.015em; }
.menu-item .mi-en { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; margin-left: auto; flex: none; padding-top: .6em; }
.menu-item:hover, .menu-item.is-active { color: var(--paper-hi); transform: translateX(10px); }
.menu-item.is-current .mi-num::after { content: "●"; margin-left: 8px; font-size: 7px; vertical-align: 2px; }
.menu-sub {
  padding: clamp(20px, 4vh, 48px) var(--pad) clamp(20px, 4vh, 48px) clamp(20px, 2.4vw, 40px);
  border-left: 1px solid rgba(242, 241, 235, .2);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.menu-sub .ms-head { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; color: rgba(242, 241, 235, .5); margin-bottom: 18px; }
.menu-sub-list { display: flex; flex-direction: column; }
.menu-sub-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(242, 241, 235, .14);
  color: rgba(242, 241, 235, .62);
  font-size: clamp(13px, 1.05vw, 15.5px);
  transition: color .3s var(--ease), padding-left .45s var(--ease-out);
}
.menu-sub-item .n { font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; color: rgba(242, 241, 235, .45); }
.menu-sub-item:hover { color: var(--paper-hi); padding-left: 10px; }
.menu-sub-item .go { margin-left: auto; opacity: 0; transition: opacity .3s; }
.menu-sub-item:hover .go { opacity: 1; }
.menu-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px var(--pad);
  border-top: 1px solid rgba(242, 241, 235, .2);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: rgba(242, 241, 235, .6);
}
.menu-foot .mf-l { display: flex; gap: 26px; flex-wrap: wrap; }
.menu-foot a { color: rgba(242, 241, 235, .75); transition: color .3s; }
.menu-foot a:hover { color: var(--paper-hi); }

/* ---------- 抽屉 ---------- */
.scrim {
  position: fixed;
  inset: 0;
  z-index: 125;
  background: rgba(16, 16, 20, .45);
  opacity: 0;
  pointer-events: none;
  transition: opacity .55s var(--ease);
}
.scrim.is-open { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(480px, 94vw);
  z-index: 130;
  background: var(--paper);
  border-left: 1px solid var(--line);
  transform: translateX(102%);
  transition: transform .75s var(--ease-out);
  display: flex;
  flex-direction: column;
  visibility: hidden;
}
.drawer.is-open { transform: none; visibility: visible; }
.drawer.is-animating { visibility: visible; }
.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 2vw, 32px);
  border-bottom: 1px solid var(--line);
}
.drawer-body { flex: 1; overflow-y: auto; padding: clamp(24px, 3.4vh, 44px) clamp(20px, 2vw, 32px); }
.drawer-body h3 {
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(24px, 2.1vw, 34px);
  line-height: 1.22;
  letter-spacing: -.012em;
  margin-bottom: 22px;
}
.drawer-rows { border-top: 1px solid var(--line); margin: clamp(20px, 3vh, 32px) 0; }
.drawer-rows > div {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}
.drawer-rows .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-40); padding-top: 3px; }
.drawer-rows .v { text-align: right; color: var(--ink-70); }
.form { display: flex; flex-direction: column; gap: 16px; margin-top: 8px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-40); }
.field input, .field textarea, .field select {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  padding: 12px 14px;
  transition: border-color .3s;
  border-radius: 0;
  appearance: none;
}
.field textarea { min-height: 96px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--blue); }
.form-done { display: none; border: 1px solid var(--blue); padding: 18px; color: var(--blue); font-size: 13.5px; }
.form.is-done .form-done { display: block; }
.form.is-done .form-fields, .form.is-done .form-submit { display: none; }

/* ---------- 提示 ---------- */
.toast-wrap {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--ink);
  color: var(--paper-hi);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  padding: 12px 18px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .4s var(--ease), transform .5s var(--ease-out);
  max-width: min(88vw, 560px);
  text-align: center;
}
.toast.is-in { opacity: 1; transform: none; }
.toast--blue { background: var(--blue); }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--line); }
.foot-cta {
  padding: clamp(64px, 12vh, 148px) var(--pad) clamp(48px, 8vh, 96px);
  border-bottom: 1px solid var(--line);
}
.foot-cta .h2 { max-width: 14em; margin-bottom: clamp(28px, 5vh, 52px); }
.foot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: clamp(24px, 3vw, 48px);
  padding: clamp(40px, 6vh, 72px) var(--pad);
  border-bottom: 1px solid var(--line);
}
.foot-col .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-40); margin-bottom: 16px; }
.foot-col ul { display: flex; flex-direction: column; gap: 9px; }
.foot-col a { color: var(--ink-60); font-size: 13.5px; transition: color .3s; }
.foot-col a:hover { color: var(--blue); }
.foot-base {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--pad);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.foot-base .fb-l, .foot-base .fb-r { display: flex; gap: 26px; align-items: center; flex-wrap: wrap; }
.foot-base .dot { color: var(--blue); }
.foot-base .live { color: var(--ink-60); }

/* ---------- 页面转场 ---------- */
.wipe {
  position: fixed;
  inset: 0;
  z-index: 220;
  background: var(--blue);
  clip-path: inset(100% 0 0 0);
  pointer-events: none;
  transition: clip-path .6s var(--ease-out);
}
.wipe.is-on { clip-path: inset(0 0 0 0); }

/* ---------- 滚动入场 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform 1s var(--ease-out); transition-delay: var(--d, 0s); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal-line { overflow: hidden; }
.reveal-line > * { display: block; transform: translateY(110%); transition: transform 1.05s var(--ease-out); transition-delay: var(--d, 0s); }
.reveal-line.is-in > * { transform: none; }

/* ---------- 首屏 ---------- */
.hero { position: relative; height: 100vh; min-height: 620px; }
.hero-frame {
  position: absolute;
  inset: var(--hero-pad-y) var(--hero-pad-x);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  z-index: 2;
}
.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(16px, 2vw, 34px);
  border-bottom: 1px solid var(--line);
}
.hero-mid {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(20px, 3vh, 40px) clamp(16px, 2vw, 34px) 0;
  min-height: 0;
}
.hero-label { margin-bottom: clamp(16px, 2.6vh, 34px); }
.hero-title {
  font-family: var(--disp);
  font-weight: 800;
  font-size: clamp(30px, min(6.9vw, 10.1vh), 130px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 0;
  max-width: 12.6em;
}
.hero-lede {
  margin-top: clamp(16px, 2.6vh, 34px);
  color: var(--ink-60);
  font-size: clamp(13px, 1vw, 16px);
  line-height: 1.85;
  max-width: 46ch;
}
.hero-lede strong { color: var(--ink); font-weight: 600; }
.hero-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(16px, 2vw, 34px) 22px;
}
.hero-status { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.hero-status .item { display: inline-flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-60); }
.hero-status .sq { width: 8px; height: 8px; background: var(--blue); flex: none; }
.hero-status .clock { color: var(--ink-40); }
.hero-cta { text-align: right; }

/* 轴线亮条（跟随鼠标 · 细线 ⇄ 宽带） */
.stripe {
  position: absolute;
  top: 0; bottom: 0;
  left: 0;
  width: 1px;
  background: var(--blue);
  z-index: 3;
  pointer-events: none;
  transform: translateX(var(--sx, 57vw));
  will-change: transform, width;
}
.stripe::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(0,0,0,.05));
  opacity: var(--stripe-fill, 0);
  transition: opacity .5s var(--ease);
}

/* 首屏反白层：随亮条位置裁剪，被覆盖的文字与元素整体反白 */
.hero-invert {
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  color: var(--paper-hi);
  clip-path: inset(0 calc(100% - var(--inv-r, 0px)) 0 var(--inv-l, 0px));
  will-change: clip-path;
  opacity: 0;
  transition: opacity .35s var(--ease);
}
.hero-invert.is-on { opacity: 1; }
.hero-invert .hero-frame { border-color: rgba(242, 241, 235, .34); }
.hero-invert .hero-top { border-bottom-color: rgba(242, 241, 235, .24); }
.hero-invert .brand .en { color: rgba(242, 241, 235, .6); }
.hero-invert .sect-label { color: rgba(242, 241, 235, .72); }
.hero-invert .sect-label .num { color: var(--paper-hi); }
.hero-invert .sect-label .sep { color: rgba(242, 241, 235, .45); }
.hero-invert .hero-title { color: var(--paper-hi); }
.hero-invert .hero-lede { color: rgba(242, 241, 235, .78); }
.hero-invert .hero-lede strong { color: var(--paper-hi); }
.hero-invert .hero-status .item { color: rgba(242, 241, 235, .8); }
.hero-invert .hero-status .sq { background: var(--paper-hi); }
.hero-invert .menu-btn { color: var(--paper-hi); }
.hero-invert .grid-icon i { background: var(--paper-hi); }
.hero-invert .btn { color: var(--paper-hi); }
.hero-invert .btn .br { color: var(--paper-hi); }

/* 首屏入场（基座层与反白层同步） */
.hero .reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease) var(--d, 0s), transform 1s var(--ease-out) var(--d, 0s); }
.hero .reveal-line > * { transform: translateY(110%); transition: transform 1.05s var(--ease-out) var(--d, 0s); }
.hero.is-ready .reveal { opacity: 1; transform: none; }
.hero.is-ready .reveal-line > * { transform: none; }
.hero-scrollhint {
  position: absolute;
  right: var(--hero-pad-x);
  bottom: calc(var(--hero-pad-y) - 34px);
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-40);
  z-index: 3;
}
.hero-scrollhint .line { width: 46px; height: 1px; background: var(--ink-25); position: relative; overflow: hidden; }
.hero-scrollhint .line::after { content: ""; position: absolute; inset: 0; background: var(--blue); transform: translateX(-100%); animation: scrollhint 2.6s var(--ease) infinite; }
@keyframes scrollhint { 0% { transform: translateX(-100%); } 60% { transform: translateX(0); } 100% { transform: translateX(100%); } }

/* ---------- 演示入口区块 ---------- */
.demo-cta { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .8fr); gap: clamp(28px, 5vw, 90px); align-items: end; }
.demo-cta .h2 { max-width: 13em; }
.demo-cta .side { display: flex; flex-direction: column; gap: 22px; align-items: flex-start; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  :root { --axis: 56vw; }
  .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .step { border-bottom: 1px solid var(--line); }
  .step:nth-child(4n) { border-right: 0; }
}

@media (max-width: 860px) {
  :root { --axis: 62vw; }
  .sec-head { grid-template-columns: 1fr; gap: 20px; }
  .sec-head .right { justify-content: flex-start; }
  .lede { text-align: left; margin-left: 0; }
  .phead-foot { grid-template-columns: 1fr; }
  .phead-foot .lede { text-align: left; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { border-bottom: 1px solid var(--line); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-last-child(-n+2) { border-bottom: 0; }
  .duo { grid-template-columns: 1fr; }
  .menu-body { grid-template-columns: 1fr; }
  .menu-sub { border-left: 0; border-top: 1px solid rgba(242, 241, 235, .2); }
  .menu-primary { justify-content: flex-start; padding-top: 26px; }
  .demo-cta { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(4n) { border-right: 1px solid var(--line); }
  .step:nth-child(2n) { border-right: 0; }
}

@media (max-width: 640px) {
  :root { --axis: 58vw; }
  .rows .axis-seg, [data-axis-line] .axis-seg { display: none; }
  .hero .stripe { display: none; }
  .row { grid-template-columns: 1fr; padding: 20px 0 22px; gap: 12px; }
  .row-left { justify-content: flex-start; padding-right: 0; }
  .row-title { text-align: left; font-size: clamp(22px, 6.4vw, 34px); }
  .row.is-active .row-title { transform: none; }
  .row-right { flex-wrap: wrap; gap: 12px; }
  .row-desc { max-width: none; }
  .row-arrow { display: none; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: 0; }
  .stat:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }
  .steps { grid-template-columns: 1fr; }
  .step { border-right: 0 !important; }
  .hero-foot { flex-direction: column; align-items: flex-start; }
  .hero-cta { text-align: left; }
  .hero-scrollhint { display: none; }
  .hero-title { font-size: clamp(32px, 9.6vw, 56px); }
  .hero-frame { inset: clamp(40px, 9vh, 80px) clamp(16px, 5vw, 28px); }
  .foot-base { flex-direction: column; align-items: flex-start; }
  .bar-row { grid-template-columns: 1fr; gap: 8px; }
  .bar-val { text-align: right; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal, .reveal-line > * { opacity: 1 !important; transform: none !important; }
  .hero .reveal, .hero .reveal-line > * { opacity: 1 !important; transform: none !important; }
  .stripe { transform: translateX(57vw) !important; width: 1px !important; }
  .hero-invert { display: none; }
}