/* ============================================================
   乐鱼主站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 侧边轨道头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色板 */
  --ink: #0B1B2B;
  --ink-deep: #063B3A;
  --aqua: #0FB5A6;
  --aqua-deep: #0B5F58;
  --cyan: #3FE3D2;
  --penalty: #FF5A2B;
  --penalty-deep: #E8451A;
  --amber: #FFA23A;
  --paper: #F5F7F8;
  --white: #FFFFFF;
  --mist: #C9D3D8;
  --read: #2A3F52;
  --ghost: #6E8CA0;
  --rail-text: #C6D5DC;
  --rail-dim: #7E9BA6;

  /* 排版 */
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --font-display: "PingFang SC", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC",
    Georgia, "Times New Roman", serif;

  /* 尺度 */
  --rail-w: 248px;
  --bar-h: 70px;
  --maxw: 1280px;
  --r-card: 20px;
  --r-block: 34px;
  --r-pill: 999px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 中文正文基调 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--read);
  background-color: var(--paper);
  padding-left: var(--rail-w);
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(63, 227, 210, 0.32); color: var(--ink); }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.rail :focus-visible { outline-color: var(--amber); }

#main-content { display: block; min-height: 70vh; padding-bottom: clamp(40px, 6vw, 80px); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: var(--ink-deep);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 5. 侧边品牌轨道 ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  padding: 26px 20px 22px;
  background: linear-gradient(180deg, #0B1B2B 0%, #0B1B2B 58%, #063B3A 100%);
  border-right: 1px solid rgba(201, 211, 216, 0.14);
  border-radius: 0 28px 28px 0;
  color: var(--rail-text);
}

.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 0 28px 28px 0;
  background-image: linear-gradient(rgba(63, 227, 210, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63, 227, 210, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.rail__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 22px;
  flex: 1;
  min-height: 0;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 2px;
  border-radius: 16px;
}
.brand__mark {
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #0FB5A6, #3FE3D2);
  color: var(--ink-deep);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand__text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.brand__sub {
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: 0.08em;
  color: var(--rail-dim);
  white-space: nowrap;
}

/* 移动端抽屉按钮 */
.rail__toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(201, 211, 216, 0.3);
  color: var(--paper);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.rail__toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.rail__toggle-bars { display: flex; flex-direction: column; gap: 5px; width: 18px; }
.rail__toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}

/* 导航 */
.rail__nav {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.rail__nav-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rail-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}
.rail__nav-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(201, 211, 216, 0.2);
}

.rail__list { counter-reset: rail; display: grid; gap: 3px; }

.rail__link {
  counter-increment: rail;
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px 9px 6px;
  border-radius: var(--r-pill);
  font-size: 15px;
  line-height: 1.5;
  color: var(--rail-text);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}
.rail__link::before {
  content: counter(rail, decimal-leading-zero);
  flex: none;
  min-width: 20px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: #5D7A8C;
  transition: color 0.18s var(--ease);
}
.rail__link:hover { background: rgba(201, 211, 216, 0.09); color: var(--paper); }
.rail__link:hover::before { color: var(--cyan); }

.rail__link[aria-current="page"] {
  background: rgba(63, 227, 210, 0.13);
  color: var(--cyan);
  font-weight: 700;
}
.rail__link[aria-current="page"]::before { color: var(--cyan); }

.rail__link[data-active="true"] { background: rgba(63, 227, 210, 0.08); color: var(--paper); }
.rail__link[data-active="true"]::before { color: var(--cyan); }

/* 轨道底部 */
.rail__foot { margin-top: auto; display: grid; gap: 12px; padding-top: 16px; }

.rail__utils { display: flex; flex-wrap: wrap; gap: 7px; }

.rail__hours {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rail-dim);
  font-variant-numeric: tabular-nums;
}

.rail__cta { width: 100%; justify-content: center; }

/* 滚动进度 */
.rail__track {
  position: absolute;
  right: 8px;
  top: 34px;
  bottom: 34px;
  width: 3px;
  border-radius: var(--r-pill);
  background: rgba(201, 211, 216, 0.18);
  overflow: hidden;
  z-index: 2;
}
.rail__track-fill {
  display: block;
  width: 100%;
  height: 0;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--cyan), var(--aqua));
  transition: height 0.12s linear;
}

/* ---------- 6. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  width: 46px;
  height: 46px;
  border-radius: var(--r-pill);
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--cyan);
  border: 1px solid rgba(63, 227, 210, 0.35);
  font-size: 17px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: #0F2637; }

/* ---------- 7. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--ink);
  color: #B9CBD3;
  border-radius: var(--r-block) var(--r-block) 0 0;
  overflow: hidden;
}
.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(63, 227, 210, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63, 227, 210, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}
.site-foot::after {
  content: "";
  position: absolute;
  left: -90px;
  top: -130px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 181, 166, 0.28), transparent 68%);
  pointer-events: none;
}
.site-foot > * { position: relative; z-index: 1; }

.foot__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  padding-top: clamp(44px, 5.5vw, 72px);
  padding-bottom: clamp(28px, 3vw, 40px);
}
@media (min-width: 900px) {
  .foot__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.85fr); gap: clamp(40px, 5vw, 72px); }
}

.foot__brand { display: grid; gap: 14px; align-content: start; }

.brand--foot .brand__name { color: var(--paper); }

.foot__tag {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: #93B4BE;
}
.foot__note { font-size: 14px; line-height: 1.8; color: #8AA3AF; max-width: 32em; }

.foot__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 26px;
}
.foot__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.foot__title::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.foot__list { display: grid; gap: 10px; }
.foot__link {
  font-size: 15px;
  line-height: 1.6;
  color: #B9CBD3;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.foot__link:hover { color: var(--paper); border-bottom-color: var(--aqua); }

.foot__meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px 28px;
  padding-top: 22px;
  padding-bottom: clamp(20px, 2.4vw, 28px);
  border-top: 1px solid rgba(201, 211, 216, 0.16);
  font-size: 14px;
  line-height: 1.7;
  color: #93AEBA;
}
@media (min-width: 720px) {
  .foot__meta { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
}
.foot__meta-item { display: flex; gap: 10px; align-items: baseline; }
.foot__meta-label {
  flex: none;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #5F7E8C;
}

.foot__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 18px;
  padding-bottom: 28px;
  border-top: 1px solid rgba(201, 211, 216, 0.16);
  font-size: 12.5px;
  line-height: 1.8;
  color: #7E99A5;
}
.foot__legal { letter-spacing: 0.02em; }
.foot__copy { color: #5F7E8C; font-variant-numeric: tabular-nums; }

/* ---------- 8. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(18px, 3.2vw, 40px);
}
.wrap--narrow { max-width: 820px; }

.grid { display: grid; gap: clamp(16px, 2.2vw, 26px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }

.split { display: grid; grid-template-columns: 1fr; gap: clamp(20px, 3vw, 40px); }
@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
}

.stack { display: grid; gap: var(--stack-gap, 18px); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 9. 排版组件 ---------- */
.prose { max-width: 36em; }
.prose h2 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 2.2em 0 0.7em;
}
.prose h3 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  margin: 1.8em 0 0.5em;
}
.prose p + p { margin-top: 1.2em; }
.prose ul,
.prose ol { display: grid; gap: 0.6em; margin: 1.2em 0; }
.prose li { position: relative; padding-left: 1.4em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--aqua);
}
.prose blockquote {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.8;
  color: var(--ink);
  border-left: 3px solid var(--aqua);
  padding: 4px 0 4px 20px;
  margin: 1.8em 0;
}
.prose a { color: var(--aqua-deep); border-bottom: 1px solid rgba(15, 181, 166, 0.45); }
.prose a:hover { border-bottom-color: var(--aqua); }
.prose code {
  font-family: var(--font-body);
  font-variant-numeric: tabular-nums;
  background: rgba(201, 211, 216, 0.35);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.92em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--aqua);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}
.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.section-head__meta {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ghost);
  font-variant-numeric: tabular-nums;
}

.num {
  font-family: var(--font-display);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--aqua);
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ghost);
}
.crumbs li { display: flex; align-items: center; gap: 8px; }
.crumbs li::after { content: "/"; color: var(--mist); }
.crumbs li:last-child::after { content: ""; }
.crumbs a:hover { color: var(--aqua-deep); }

/* ---------- 10. 按钮 / 胶囊 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn--primary { background: var(--penalty); color: #FFFFFF; }
.btn--primary:hover { background: var(--penalty-deep); transform: translateY(-1px); }
.btn--ghost { border-color: var(--mist); color: var(--read); background: transparent; }
.btn--ghost:hover { border-color: var(--aqua); color: var(--aqua-deep); }
.btn--onDark { border-color: rgba(201, 211, 216, 0.35); color: #E8F1F3; background: transparent; }
.btn--onDark:hover { border-color: var(--cyan); color: var(--cyan); }
.btn[data-copied] { background: var(--aqua); color: var(--ink-deep); }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  line-height: 1.4;
}
.pill--ghost {
  border: 1px solid rgba(201, 211, 216, 0.28);
  background: rgba(255, 255, 255, 0.03);
  color: #B9CBD3;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.pill--ghost:hover { color: var(--cyan); border-color: var(--cyan); }
.pill--aqua { background: rgba(15, 181, 166, 0.15); color: var(--aqua-deep); }

/* ---------- 11. 卡片 ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--mist);
  border-radius: var(--r-card);
  padding: clamp(18px, 2vw, 26px);
}
.card--ink { background: var(--ink); border-color: transparent; color: var(--rail-text); }
.card--link { transition: border-color 0.18s var(--ease), transform 0.18s var(--ease); }
.card--link:hover { border-color: var(--aqua); transform: translateY(-2px); }

/* ---------- 12. 图片容器 ---------- */
.media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-card);
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-deep) 100%);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media__img { width: 100%; height: 100%; object-fit: cover; }
.media--shade::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 27, 43, 0) 42%, rgba(11, 27, 43, 0.76) 100%);
  pointer-events: none;
}
.media__cap {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--paper);
  text-shadow: 0 1px 6px rgba(11, 27, 43, 0.7);
}

/* ---------- 13. 主题筛选 ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.chip {
  padding: 7px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--mist);
  background: var(--white);
  color: var(--read);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}
.chip:hover { border-color: var(--aqua); color: var(--aqua-deep); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--cyan); }
.chip--reset { border-style: dashed; color: var(--ghost); }

/* ---------- 14. 步骤轨道 ---------- */
.track { display: grid; gap: 12px; }
.step {
  background: var(--white);
  border: 1px solid var(--mist);
  border-radius: var(--r-card);
  overflow: hidden;
  transition: border-color 0.18s var(--ease);
}
.step[data-open] { border-color: rgba(15, 181, 166, 0.55); }
.step__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  text-align: left;
  padding: 16px 20px;
}
.step__node {
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: var(--r-pill);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  background: rgba(15, 181, 166, 0.14);
  border: 1px solid rgba(15, 181, 166, 0.4);
  color: var(--aqua-deep);
}
.step__title { font-size: 16px; font-weight: 700; color: var(--ink); line-height: 1.5; }
.step__hint {
  margin-left: auto;
  flex: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ghost);
}
.step[data-open] .step__node {
  background: var(--aqua);
  border-color: var(--aqua);
  color: #04302C;
  animation: step-breathe 2.4s ease-in-out infinite;
}
@keyframes step-breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(63, 227, 210, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(63, 227, 210, 0); }
}
.step__body {
  padding: 0 20px 20px 64px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--read);
}

/* ---------- 15. 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
html.js [data-reveal].is-in { opacity: 1; transform: translateY(0); }

/* ---------- 16. 移动端与平板 ---------- */
@media (max-width: 1023px) {
  body {
    padding-left: 0;
    padding-top: var(--bar-h);
  }

  .rail {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--bar-h);
    flex-direction: row;
    align-items: center;
    padding: 0 14px;
    border-right: 0;
    border-bottom: 1px solid rgba(201, 211, 216, 0.14);
    border-radius: 0 0 26px 26px;
  }
  .rail::before { border-radius: 0 0 26px 26px; background-size: 44px 44px; }

  .rail[data-open]::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    background: rgba(11, 27, 43, 0.58);
  }

  .rail__inner {
    position: relative;
    z-index: 3;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    height: var(--bar-h);
  }

  .rail__toggle { display: inline-flex; }
  .rail[data-open] .rail__toggle-bars span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .rail[data-open] .rail__toggle-bars span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .rail__nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 2;
    width: min(340px, 88vw);
    height: 100dvh;
    flex: none;
    padding: 84px 22px 30px;
    gap: 18px;
    background: #0B1B2B;
    border-radius: 26px 0 0 26px;
    transform: translateX(102%);
    transition: transform 0.3s var(--ease);
    box-shadow: -30px 0 60px rgba(11, 27, 43, 0.45);
  }
  .rail__nav[data-open] { transform: none; }

  .rail__link { font-size: 16px; padding: 11px 14px 11px 8px; }
  .rail__foot { padding-top: 10px; }
  .rail__track { display: none; }
  .to-top { right: 16px; bottom: 16px; }
}

@media (max-width: 420px) {
  .brand__sub { display: none; }
  .brand__mark { width: 38px; height: 38px; border-radius: 12px; font-size: 16px; }
  .brand__name { font-size: 17px; }
  .rail__toggle-label { display: none; }
  .step__body { padding-left: 20px; }
}

/* ---------- 17. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}