/* ============================================================
   TeTher 官网 · site.css
   设计铁律：无紫色 / 无渐变 / 无阴影 / 无卡片 / 无圆角
   骨架：纯黑面 + 1px 发丝线 + 唯一强调色（终端绿）
   区块骨架（区别于旧版）：索引大行 / 横排步骤带 /
   命令行文件清单 / git-log 式日志行 / 宣言式关于
   ============================================================ */

:root {
  --bg: #0a0a0a;
  --bg2: #0e0e0e;
  --bg3: #121212;
  --ink: #e6e6e1;
  --dim: #8f948b;
  --faint: #565b53;
  --line: #1d1f1c;
  --line2: #2b2e29;
  --acc: #4ade80;
  --acc-ink: #06130a;
  --acc-dim: #2f7a4c;
  --amber: #e8b45a;
  --red: #ff6b5e;
  --code-bg: rgba(230, 230, 225, .04);
  --sel-ink: #06130a;

  --mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', ui-monospace,
          Consolas, 'Liberation Mono', Menlo, monospace;
  --sans: 'HarmonyOS Sans SC', -apple-system, 'PingFang SC',
          'Microsoft YaHei', system-ui, sans-serif;

  --nav-h: 60px;
  --bar-h: 46px;
  --wrap: 1120px;
}

html[data-theme='light'] {
  --bg: #f4f3ee;
  --bg2: #ecebe3;
  --bg3: #e4e3da;
  --ink: #1c1e1b;
  --dim: #5c6157;
  --faint: #94988d;
  --line: #dcdad0;
  --line2: #c7c5b9;
  --acc: #0e8a4c;
  --acc-ink: #f4f3ee;
  --acc-dim: #0e8a4c;
  --amber: #8f6414;
  --red: #c2402f;
  --code-bg: rgba(28, 30, 27, .045);
  --sel-ink: #f4f3ee;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}
html[data-theme='light'] { color-scheme: light; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  overflow-x: hidden;
  transition: background .3s ease, color .3s ease;
}

::selection { background: var(--acc); color: var(--sel-ink); }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

code {
  font-family: var(--mono);
  font-size: .9em;
  color: var(--acc);
  background: var(--code-bg);
  padding: 1px 6px;
}

:focus-visible { outline: 1px solid var(--acc); outline-offset: 2px; }

/* ---------- 图标（iconfont.cn Symbol 引用方式，随文字色/主题变色） ---------- */
.ic {
  display: inline-block;
  vertical-align: -.16em;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ic-fill { fill: currentColor; stroke: none; }
.ic-bare { fill: none; stroke: none; }
/* 品牌标记：深色主题下白方块+深色箭头，浅色主题自动反转 */
:root { --mark-bg: var(--ink); --mark-fg: var(--bg); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line2); }
::-webkit-scrollbar-thumb:hover { background: var(--acc-dim); }
html { scrollbar-width: thin; scrollbar-color: var(--line2) var(--bg); }

/* ---------- 自定义光标（仅精确指针设备） ---------- */
body.has-cursor,
body.has-cursor a,
body.has-cursor button,
body.has-cursor summary { cursor: none; }
body.has-cursor input,
body.has-cursor textarea { cursor: none; }

.cursor {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 12px; height: 12px;
  border: 1px solid var(--acc);
  z-index: 9998;
  pointer-events: none;
  opacity: 0;
  transition: width .22s ease, height .22s ease,
              background-color .22s ease, opacity .3s ease;
}
body.has-cursor .cursor { display: block; }
.cursor.on { opacity: 1; }
.cursor.is-link {
  width: 36px; height: 36px;
  background: rgba(74, 222, 128, .12);
}
html[data-theme='light'] .cursor.is-link { background: rgba(14, 138, 76, .10); }
.cursor-dot {
  position: absolute;
  top: 50%; left: 50%;
  width: 3px; height: 3px;
  margin: -1.5px 0 0 -1.5px;
  background: var(--acc);
  transition: transform .22s ease;
}
.cursor.is-link .cursor-dot { transform: scale(0); }

/* ---------- 顶部滚动进度线 ---------- */
.progress {
  position: fixed;
  top: 0; left: 0;
  height: 1px;
  width: 0;
  background: var(--acc);
  z-index: 9999;
  pointer-events: none;
}

/* ---------- 背景字符场 ---------- */
.field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: background .3s ease, border-color .3s ease;
}
.nav-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}
.logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 7px;
}
.logo-p { color: var(--acc); margin-right: 7px; }
.logo:hover .logo-p { animation: blink 1s step-end infinite; }

.nav-links { display: flex; gap: 24px; margin-left: auto; align-items: center; position: relative; }
.nav-links a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .5px;
  color: var(--dim);
  padding: 4px 0;
  transition: color .2s ease;
}
.nav-links a:hover,
.nav-links a.on { color: var(--acc); }
.nav-links a.nav-vip { color: var(--amber); }
.nav-links a.nav-vip:hover { color: var(--amber); }
.nav-underline {
  position: absolute;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--acc);
  opacity: 0;
  transition: left .28s cubic-bezier(.6, 0, .2, 1),
              width .28s cubic-bezier(.6, 0, .2, 1),
              opacity .3s ease;
}

.theme-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line2);
  color: var(--dim);
  transition: color .2s ease, border-color .2s ease;
  flex-shrink: 0;
}
.theme-btn:hover { color: var(--acc); border-color: var(--acc); }
html[data-theme='dark'] .i-sun { display: none; }
html[data-theme='light'] .i-moon { display: none; }

.nav-burger {
  display: none;
  width: 34px; height: 32px;
  border: 1px solid var(--line2);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-burger span { display: block; width: 16px; height: 1.5px; background: var(--dim); transition: transform .25s ease, opacity .25s ease; }
.nav.open .nav-burger span:nth-child(1) { transform: translateY(3.25px) rotate(45deg); }
.nav.open .nav-burger span:nth-child(2) { transform: translateY(-3.25px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - var(--bar-h));
  min-height: calc(100svh - var(--bar-h));
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 48px;
}
.hero-grid {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 56px;
  align-items: center;
}

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--acc);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}
.kicker::before { content: ''; width: 26px; height: 1px; background: var(--acc); flex-shrink: 0; }

.hero-h1 {
  font-family: var(--mono);
  font-size: clamp(29px, 4.4vw, 47px);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -.5px;
  margin-bottom: 20px;
}
.h1-rot { color: var(--acc); }
.caret {
  display: inline-block;
  width: .48em; height: .92em;
  background: var(--acc);
  margin-left: 5px;
  vertical-align: -.06em;
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.hero-sub {
  color: var(--dim);
  font-size: 15.5px;
  max-width: 46ch;
  margin-bottom: 32px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

.btn {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
  will-change: transform;
}
.btn:active { opacity: .85; }
.btn-arr { display: inline-flex; transition: transform .25s ease; }
.btn-solid { background: var(--acc); color: var(--acc-ink); border-color: var(--acc); font-weight: 700; }
.btn-solid:hover { background: transparent; color: var(--acc); }
.btn-line { border-color: var(--line2); color: var(--ink); }
.btn-line:hover { border-color: var(--acc); color: var(--acc); }
.btn-line:hover .btn-arr { transform: translate(2px, -2px); }
.btn-solid:hover .btn-arr { transform: translateY(2px); }

.hero-hint {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
  margin-top: 16px;
}
.hero-hint b { color: var(--dim); font-weight: 400; }

/* ---------- 规格面板 ---------- */
.spec {
  border: 1px solid var(--line2);
  background: color-mix(in srgb, var(--bg2) 92%, transparent);
  transition: background .3s ease, border-color .3s ease;
}
.spec-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--bg3);
}
.spec-cmd {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--acc);
  letter-spacing: .5px;
}
.spec-blink {
  width: 7px; height: 14px;
  background: var(--acc);
  animation: blink 1.1s step-end infinite;
}
.spec-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  position: relative;
  transition: background .2s ease;
}
.spec-row:hover { background: var(--code-bg); }
.spec-row > span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--faint);
  flex-shrink: 0;
}
.spec-row > b {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--ink);
  text-align: right;
}
.spec-row .hl-num { color: var(--acc); font-style: normal; }
.spec-chip {
  font-style: normal;
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--acc);
  border: 1px solid var(--acc-dim);
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: 1px;
}
.spec-foot {
  display: flex;
  align-items: center;
  padding: 12px 18px;
}
.spec-foot .ps { font-family: var(--mono); color: var(--acc); font-weight: 700; font-size: 12px; }
.spec-caret {
  width: 8px; height: 15px;
  background: var(--acc);
  animation: blink 1.1s step-end infinite;
}

/* ---------- 状态条 ---------- */
.statusbar {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: border-color .3s ease;
}
.statusbar-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--bar-h);
  display: flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .5px;
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.statusbar-in::-webkit-scrollbar { display: none; }
.seg {
  padding: 5px 18px;
  border-left: 1px solid var(--line);
  color: var(--dim);
  flex-shrink: 0;
}
.seg:first-child { border-left: none; padding-left: 0; }
.seg-on {
  background: var(--acc);
  color: var(--acc-ink);
  font-weight: 700;
  padding: 5px 12px;
  margin-right: 14px;
  flex-shrink: 0;
}
.seg b { color: var(--acc); font-weight: 400; }

/* ---------- 跑马灯 ---------- */
.marquee {
  position: relative;
  z-index: 1;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  user-select: none;
}
.marquee-track {
  display: flex;
  white-space: nowrap;
  will-change: transform;
  width: max-content;
}
.marquee-seg {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--faint);
  text-transform: uppercase;
}
.marquee-seg i {
  font-style: normal;
  color: var(--acc-dim);
  margin: 0 18px;
}

/* ---------- 通用 section 头 ---------- */
.sec {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 96px 24px 0;
}
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.sec-no {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  letter-spacing: 1px;
}
.sec-title {
  font-family: var(--mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  letter-spacing: -.4px;
}
.sec-sub {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  margin-left: auto;
  letter-spacing: 1px;
}

/* ---------- 滚动揭示（门控：首帧 rAF 到了才隐藏） ---------- */
.js.motion-ok .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
  transition-delay: var(--rvd, 0s);
}
.js.motion-ok .reveal.show { opacity: 1; transform: none; }

/* ---------- 01 功能：索引大行 ---------- */
.idx { list-style: none; border-top: 1px solid var(--line); }
.idx-row {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  gap: 24px;
  align-items: baseline;
  padding: 24px 10px;
  border-bottom: 1px solid var(--line);
  transition: background .2s ease, padding-left .3s cubic-bezier(.2, 0, .2, 1);
}
.idx-row:hover { background: var(--bg2); padding-left: 26px; }
.idx-no {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--line2);
  letter-spacing: 1px;
  transition: color .25s ease;
  line-height: 1;
}
.idx-row:hover .idx-no { color: var(--acc); }
.idx-main h3 {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 5px;
}
.idx-main p { font-size: 13.5px; color: var(--dim); line-height: 1.7; max-width: 66ch; }
.idx-arr {
  color: var(--line2);
  transition: color .25s ease, transform .25s ease;
  align-self: center;
  display: inline-flex;
}
.idx-row:hover .idx-arr { color: var(--acc); transform: translateX(5px); }

/* ---------- 02 上手：横排步骤带 ---------- */
.strip {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.strip-step { padding: 4px 28px 4px 0; }
.strip-step + .strip-step { border-left: 1px solid var(--line); padding-left: 28px; }
.ss-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--acc);
  display: block;
  margin-bottom: 12px;
}
.strip-step h3 { font-family: var(--mono); font-size: 15px; margin-bottom: 7px; }
.strip-step p { font-size: 13px; color: var(--dim); line-height: 1.7; }
.strip-step { transition: border-color .3s ease; }
.strip-step:hover + .strip-step { border-left-color: var(--acc-dim); }

/* ---------- 03 下载：命令行文件清单 ---------- */
.dls { border-top: 1px solid var(--line); }
.dl-row {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 22px;
  align-items: center;
  padding: 26px 10px;
  border-bottom: 1px solid var(--line);
  transition: background .2s ease;
}
.dl-row:hover { background: var(--bg2); }
.dl-ps {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--line2);
  transition: color .25s ease;
}
.dl-row:hover .dl-ps { color: var(--acc); }
.dl-main h3 {
  font-family: var(--mono);
  font-size: 16px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.dl-badge {
  font-style: normal;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--acc);
  border: 1px solid var(--acc-dim);
  padding: 1px 8px;
}
.dl-badge.gold { color: var(--amber); border-color: var(--amber); }
.dl-main p { font-size: 13.5px; color: var(--dim); line-height: 1.7; max-width: 70ch; }
.dl-note {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
  margin-top: 8px;
}
.dl-note a { color: var(--faint); text-decoration: underline; transition: color .2s ease; }
.dl-note a:hover { color: var(--acc); }
.dl-static {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: .5px;
}
.btn.gold { background: var(--amber); border: 1px solid var(--amber); color: #1a1204; font-weight: 700; }
.btn.gold:hover { background: transparent; color: var(--amber); }

/* ---------- 04 更新日志：git-log 式紧凑行 ---------- */
.clg { border-top: 1px solid var(--line); }
.clg-row { border-bottom: 1px solid var(--line); }
.clg-row summary {
  display: grid;
  grid-template-columns: 84px 100px auto 1fr 22px;
  gap: 16px;
  align-items: baseline;
  padding: 15px 10px;
  cursor: pointer;
  list-style: none;
  transition: background .2s ease;
}
.clg-row summary::-webkit-details-marker { display: none; }
.clg-row summary:hover { background: var(--bg2); }
.clg-ver { font-family: var(--mono); font-size: 14px; font-weight: 700; color: var(--ink); }
.clg-row.latest .clg-ver { color: var(--acc); }
.clg-date { font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 1px; }
.clg-badge {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  padding: 1px 8px;
  border: 1px solid var(--line2);
  color: var(--dim);
  justify-self: start;
}
.clg-badge:empty { display: none; }
.clg-badge.review { color: var(--amber); border-color: var(--amber); }
.clg-badge.market { color: var(--acc); border-color: var(--acc-dim); }
.clg-sum {
  font-size: 13px;
  color: var(--dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.clg-toggle {
  color: var(--faint);
  transition: transform .25s ease, color .25s ease;
  justify-self: end;
  display: inline-flex;
}
.clg-row summary:hover .clg-toggle { color: var(--acc); }
.clg-row[open] .clg-toggle { transform: rotate(180deg); color: var(--acc); }
.clg-body {
  padding: 2px 10px 22px 110px;
  animation: clgIn .35s ease;
}
@keyframes clgIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}
.log-list { list-style: none; }
.log-list li {
  font-size: 13.5px;
  color: var(--dim);
  line-height: 1.9;
  padding-left: 18px;
  position: relative;
}
.log-list li.add::before { content: '+'; position: absolute; left: 0; color: var(--acc); font-family: var(--mono); }
.log-list li.fix::before { content: '~'; position: absolute; left: 0; color: var(--amber); font-family: var(--mono); }
.log-note {
  font-size: 13px;
  color: var(--dim);
  border: 1px dashed var(--line2);
  padding: 12px 16px;
  margin: 12px 0 0;
  line-height: 1.9;
}
.log-note b { color: var(--amber); font-weight: 700; font-family: var(--mono); font-size: 12px; }

/* ---------- 05 关于：宣言式 ---------- */
.mani {
  font-size: clamp(17px, 2vw, 21px);
  line-height: 2.05;
  color: var(--dim);
  max-width: 34em;
}
.mani b { color: var(--ink); font-weight: 600; }
.factline {
  margin-top: 44px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
}
.factline i { font-style: normal; color: var(--line2); }
.factline a { color: var(--dim); transition: color .2s ease; }
.factline a:hover { color: var(--acc); }

/* ---------- 页脚 ---------- */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  margin-top: 96px;
  transition: border-color .3s ease;
}
.ft-big {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(56px, 10vw, 132px);
  line-height: 1.1;
  letter-spacing: .06em;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1px var(--line2);
  user-select: none;
  transition: color .4s ease, -webkit-text-stroke-color .4s ease;
  padding: 40px 0 0;
}
.ft-big:hover { color: var(--acc); -webkit-text-stroke-color: var(--acc); }
.ft-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 28px 24px 36px;
  text-align: center;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
  line-height: 2.2;
}
.ft-in a { color: var(--dim); transition: color .2s ease; }
.ft-in a:hover { color: var(--acc); }
.ft-in .sep { margin: 0 10px; color: var(--line2); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero { padding-top: calc(var(--nav-h) + 28px); }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .strip { grid-template-columns: repeat(2, 1fr); gap: 28px 0; }
  .strip-step { padding: 0 24px 0 0; }
  .strip-step + .strip-step { border-left: none; padding-left: 0; }
  .strip-step:nth-child(even) { border-left: 1px solid var(--line); padding-left: 24px; }
  .idx-row { grid-template-columns: 56px 1fr; gap: 18px; }
  .idx-no { font-size: 22px; }
  .idx-arr { display: none; }
  .dl-row { grid-template-columns: 1fr; gap: 14px; }
  .dl-ps { display: none; }
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .theme-btn { margin-left: auto; }
  .nav-burger { display: flex; }
  .nav-in { gap: 14px; }
  .nav.open .nav-links {
    display: flex;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 4px 24px 14px;
  }
  .nav.open .nav-links a { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
  .nav.open .nav-links a:last-child { border-bottom: none; }
  .nav-underline { display: none; }
  .hero-h1 br { display: none; }
  .hero-h1 .h1-line { display: block; }
  .sec { padding-top: 64px; }
  .sec-head { margin-bottom: 26px; }
  .sec-sub { margin-left: 0; width: 100%; }
  .idx-row { padding: 18px 4px; }
  .strip { grid-template-columns: 1fr; }
  .strip-step { padding: 0 !important; border-left: none !important; }
  .strip-step + .strip-step { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 24px; }
  .clg-row summary { grid-template-columns: auto auto 1fr 18px; gap: 10px; }
  .clg-date { display: none; }
  .clg-sum { display: none; }
  .clg-body { padding-left: 10px; }
}

/* ---------- 文档页（隐私 / 协议） ---------- */
.doc {
  max-width: 800px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 48px) 24px 56px;
  position: relative;
  z-index: 1;
}
.doc-back {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 28px;
  transition: color .2s ease;
}
.doc-back:hover { color: var(--acc); }
.doc h1 {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 30px);
  letter-spacing: -.3px;
  margin-bottom: 8px;
}
.doc-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  margin-bottom: 34px;
  line-height: 1.9;
}
.doc h2 {
  font-family: var(--mono);
  font-size: 16px;
  margin: 36px 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--acc);
}
.doc h3 { font-family: var(--mono); font-size: 14px; margin: 24px 0 8px; color: var(--ink); }
.doc p, .doc li { font-size: 14px; color: var(--dim); line-height: 1.95; }
.doc p { margin-bottom: 10px; }
.doc ul, .doc ol { margin: 8px 0 14px 22px; }
.doc li { margin-bottom: 6px; }
.doc strong, .doc b { color: var(--ink); font-weight: 600; }
.doc a { color: var(--acc); }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0 16px; font-size: 13px; }
.doc th, .doc td {
  border: 1px solid var(--line2);
  padding: 9px 10px;
  text-align: left;
  vertical-align: top;
  color: var(--dim);
  line-height: 1.7;
}
.doc th { background: var(--bg3); color: var(--ink); font-family: var(--mono); font-size: 12px; }
.doc .note { border: 1px dashed var(--amber); padding: 12px 16px; margin: 14px 0; font-size: 13px; color: var(--dim); line-height: 1.9; }

/* ---------- VIP 兑换表单 ---------- */
.vip-narrow { max-width: 560px; margin: 0 auto; }
.vip-sub { color: var(--dim); font-size: 14px; margin-bottom: 26px; }
.vip-sub b { color: var(--acc); font-weight: 600; }
.vip-form label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--faint);
  margin: 18px 0 7px;
}
.vip-form label i { color: var(--acc); font-style: normal; }
.vip-form input, .vip-form select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line2);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  padding: 11px 13px;
  outline: none;
  transition: border-color .2s ease;
}
.vip-form input:focus, .vip-form select:focus { border-color: var(--acc); }
.vip-form input::placeholder { color: var(--faint); }
.vip-form .msg { margin-top: 16px; font-size: 13px; min-height: 1.6em; }
.vip-form .msg.err { color: var(--red); }
.vip-form .msg.info { color: var(--acc); }
.code-box {
  display: none;
  border: 1px dashed var(--acc-dim);
  padding: 24px 22px;
  margin-top: 24px;
  text-align: center;
}
.code-box.show { display: block; }
.code-box .code-label { font-family: var(--mono); font-size: 11px; letter-spacing: 1px; color: var(--faint); margin-bottom: 10px; }
.code-box .code {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--acc);
  word-break: break-all;
  user-select: all;
}
.code-box .copy {
  background: none;
  border: none;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11.5px;
  text-decoration: underline;
  cursor: pointer;
  margin-top: 12px;
  transition: color .2s ease;
}
.code-box .copy:hover { color: var(--acc); }
.code-box .how { text-align: left; margin-top: 20px; font-size: 12.5px; color: var(--dim); line-height: 1.9; }
.code-box .how b { color: var(--acc); font-family: var(--mono); font-size: 12px; }
.code-box .how ol { padding-left: 20px; margin-top: 6px; }
.code-box .how .once { display: block; margin-top: 8px; color: var(--faint); font-size: 12px; }

/* ---------- 启明模型：体验申请 ---------- */
.apply {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.apply-copy p { font-size: 15px; color: var(--dim); line-height: 2; max-width: 40ch; }
.apply-copy p b { color: var(--ink); font-weight: 600; }
.apply-list {
  list-style: none;
  margin-top: 22px;
  border-top: 1px solid var(--line);
}
.apply-list li {
  font-size: 13px;
  color: var(--faint);
  padding: 10px 0 10px 16px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.apply-list li::before {
  content: '·';
  position: absolute;
  left: 2px;
  color: var(--acc);
  font-weight: 700;
}
.apply-form { display: block; }
.apply-form label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--faint);
  margin: 16px 0 7px;
}
.apply-form label:first-of-type { margin-top: 0; }
.apply-form label i { color: var(--acc); font-style: normal; }
.apply-form input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line2);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  padding: 11px 13px;
  outline: none;
  transition: border-color .2s ease;
}
.apply-form input:focus { border-color: var(--acc); }
.apply-form input::placeholder { color: var(--faint); }
.apply-form .btn { width: 100%; justify-content: center; margin-top: 22px; }
.apply-msg { margin-top: 14px; font-size: 13px; min-height: 1.6em; line-height: 1.7; }
.apply-msg.err { color: var(--red); }
.apply-msg.info { color: var(--acc); }
@media (max-width: 760px) {
  .apply { grid-template-columns: 1fr; gap: 30px; }
}

/* ---------- 降低动效偏好：全部收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html { scroll-behavior: auto; }
  .caret, .spec-blink, .spec-caret { animation: none; }
  .js.motion-ok .reveal { opacity: 1; transform: none; }
}