/* =========================================================
   jbo-login-guide.com.cn — 共享站点套件 / assets/site.css
   墨蓝终端底板 + 纸张叠层标签卡 + 路径坐标系统
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

:root {
  /* --- 色彩 --- */
  --ink-950: #0A1120;
  --ink-900: #111B31;
  --ink-800: #18243E;
  --ink-600: #26344F;
  --jbo-red: #E13A46;
  --red-700: #B0202C;
  --cyan: #33D0DE;
  --gold: #E4B45A;
  --paper: #F3EFE4;
  --mist: #9CA8C2;
  --paper-2: #E5DFCF;
  --paper-dim: rgba(243, 239, 228, .78);
  --paper-faint: rgba(243, 239, 228, .56);
  --cyan-soft: rgba(51, 208, 222, .10);
  --gold-soft: rgba(228, 180, 90, .14);

  /* --- 字体 --- */
  --font-display: "Oswald", "Arial Narrow", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* --- 结构 --- */
  --wrap: 1280px;
  --gutter: 24px;
  --bd: 1px solid var(--ink-600);
  --radius: 3px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --t: 260ms var(--ease);
  --t-fast: 180ms var(--ease);
}

/* ---------------- 基础排版 ---------------- */
body {
  min-height: 100vh;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(to right, rgba(38, 52, 79, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(38, 52, 79, .16) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  background-position: -1px -1px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
}
body.nav-open { overflow: hidden; }

#main-content { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.01em;
}
h1 { font-size: clamp(30px, 5vw, 56px); font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: clamp(22px, 3vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 24px); }
h4 { font-size: 17px; }

.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7vw, 92px);
  line-height: .98;
  letter-spacing: -.02em;
}

.mono {
  font-family: var(--font-mono);
  font-size: .86em;
  letter-spacing: .03em;
  font-variant-numeric: tabular-nums;
}
.label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--mist);
}
.coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--cyan); }
.rule { height: 1px; border: 0; background: var(--ink-600); margin: 22px 0; }

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

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
::selection { background: var(--jbo-red); color: #fff; }

/* ---------------- 布局容器 ---------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(38px, 6vw, 82px); }
.section-head { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: flex-end; justify-content: space-between; margin-bottom: 26px; }

.split { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 980px) {
  .split { grid-template-columns: repeat(12, 1fr); gap: 24px; }
  .split--5-7 > *:first-child { grid-column: span 5; }
  .split--5-7 > *:last-child { grid-column: span 7; }
  .split--7-5 > *:first-child { grid-column: span 7; }
  .split--7-5 > *:last-child { grid-column: span 5; }
}

/* ---------------- Bento 模块网格 ---------------- */
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}
.cell {
  grid-column: span 12;
  position: relative;
  background: var(--ink-900);
  border: var(--bd);
  border-radius: var(--radius);
  padding: 20px;
}
@media (min-width: 768px) {
  .bento { gap: 16px; }
  .cell--sm { grid-column: span 6; }
  .cell--md { grid-column: span 6; }
}
@media (min-width: 1100px) {
  .cell--sm { grid-column: span 3; }
  .cell--md { grid-column: span 4; }
  .cell--lg { grid-column: span 7; }
  .cell--xl { grid-column: span 8; }
  .cell--side { grid-column: span 5; }
}

/* ---------------- 全宽横向主题带 ---------------- */
.band {
  background: var(--ink-800);
  border-top: var(--bd);
  border-bottom: var(--bd);
  padding-block: 26px;
}
.band .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  align-items: center;
  justify-content: space-between;
}

/* ---------------- 卡片与标签 ---------------- */
.card {
  background: var(--ink-900);
  border: var(--bd);
  border-radius: var(--radius);
  padding: 20px;
}
.card--raised { background: var(--ink-800); }
.card--paper { background: var(--paper-2); border-color: var(--paper-2); color: var(--ink-950); }
.card--paper .label,
.card--paper .mono { color: rgba(10, 17, 32, .62); }
.card-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  background: var(--ink-900);
  border: 1px solid var(--ink-600);
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--mist);
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.chip:hover { color: var(--paper); border-color: var(--mist); }
.chip[aria-pressed="true"] { color: var(--cyan); border-color: var(--cyan); background: var(--cyan-soft); }
.chip--gold { color: var(--gold); border-color: rgba(228, 180, 90, .5); }

/* ---------------- 时间轴 ---------------- */
.timeline {
  position: relative;
  margin: 0;
  padding-left: 26px;
  border-left: 1px solid var(--ink-600);
}
.tl-item { position: relative; padding-block: 12px; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 22px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--ink-950);
}
.tl-item--now::before { background: var(--jbo-red); }
.tl-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--gold);
}

/* ---------------- 面包屑 ---------------- */
.crumbs { margin: 16px 0 0; font-size: 13px; color: var(--mist); }
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 0 8px; }
.crumbs li { display: inline-flex; align-items: center; }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: var(--ink-600); }
.crumbs a { color: var(--mist); transition: color var(--t-fast); }
.crumbs a:hover { color: var(--cyan); }

/* ---------------- 正文 ---------------- */
.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.05em; color: var(--paper-dim); }
.prose h2, .prose h3 { margin: 1.4em 0 .5em; color: var(--paper); }
.prose ul { margin-bottom: 1.05em; }
.prose ul li { position: relative; padding-left: 18px; color: var(--paper-dim); }
.prose ul li::before { content: ""; position: absolute; left: 0; top: .82em; width: 8px; height: 1px; background: var(--cyan); }
.prose strong { color: var(--paper); font-weight: 700; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(51, 208, 222, .35); }
.prose a:hover { border-bottom-color: var(--cyan); }

/* ---------------- 图片容器 ---------------- */
.figure {
  position: relative;
  overflow: hidden;
  border: var(--bd);
  border-radius: var(--radius);
  background: var(--ink-800);
  aspect-ratio: 16 / 9;
}
.figure img { width: 100%; height: 100%; object-fit: cover; }
.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 4 / 5; }
.figure--square { aspect-ratio: 1 / 1; }
.figure-frame::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(243, 239, 228, .16);
  pointer-events: none;
}
.figure-cap { margin-top: 8px; font-size: 12.5px; letter-spacing: .04em; color: var(--mist); }
.figure-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(156, 168, 194, .7);
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  background: transparent;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.btn:hover { color: var(--cyan); border-color: var(--cyan); }
.btn:active { color: var(--cyan); border-color: var(--cyan); background: var(--cyan-soft); }
.btn-ghost { background: transparent; }
.btn--red { background: var(--jbo-red); border-color: var(--jbo-red); color: #fff; }
.btn--red:hover { background: var(--red-700); border-color: var(--red-700); color: #fff; }
.btn--red:active { background: var(--red-700); border-color: var(--red-700); }
.btn-arrow { font-family: var(--font-mono); transition: transform var(--t-fast); }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ---------------- 跳转链 ---------------- */
.skip-link {
  position: fixed;
  left: 12px;
  top: 8px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--jbo-red);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform var(--t-fast);
}
.skip-link:focus { transform: translateY(0); }

/* =========================================================
   头部
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-600);
}
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--gold), var(--jbo-red));
  transform: scaleX(var(--p, 0));
  transform-origin: 0 50%;
  pointer-events: none;
  z-index: 90;
}
.hdr-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 上层品牌条 */
.hdr-upper { background: var(--ink-900); border-bottom: 1px solid var(--ink-600); }
.hdr-upper .hdr-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  min-height: 44px;
  padding-block: 5px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 22px;
  background: var(--jbo-red);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  border-radius: 2px;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.brand-line {
  padding-left: 10px;
  border-left: 1px solid var(--ink-600);
  font-size: 12.5px;
  color: var(--mist);
  white-space: nowrap;
}
.brand--footer .brand-mark { width: 40px; height: 24px; font-size: 13px; }
.brand--footer .brand-name { font-size: 19px; }

.hdr-search { display: flex; align-items: center; gap: 8px; margin-left: auto; flex: 0 1 320px; }
.hdr-input {
  width: 100%;
  height: 32px;
  padding: 0 10px;
  background: var(--ink-950);
  border: 1px solid var(--ink-600);
  border-radius: 2px;
  color: var(--paper);
  font-size: 13.5px;
  transition: border-color var(--t-fast);
}
.hdr-input::placeholder { color: rgba(156, 168, 194, .72); }
.hdr-input:focus { border-color: var(--cyan); outline: none; }
.hdr-search-hint { font-size: 11px; color: var(--mist); white-space: nowrap; }

.hdr-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 12.5px;
  color: var(--gold);
  white-space: nowrap;
}
.hdr-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-soft);
}

/* 下层栏目条 */
.hdr-lower { background: var(--ink-950); }
.hdr-wrap--nav {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 56px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  background: var(--ink-900);
  border: 1px solid var(--ink-600);
  border-radius: 2px;
  color: var(--paper);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle-bars i { display: block; height: 2px; background: currentColor; transition: transform var(--t-fast), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-text { letter-spacing: .04em; }

.site-nav { display: block; }
.nav-panel-title { display: none; }
.nav-list { display: flex; flex-wrap: wrap; align-items: center; gap: 2px; }
.nav-item { display: block; }
.nav-link {
  position: relative;
  display: inline-block;
  padding: 17px 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-dim);
  transition: color var(--t-fast);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 220ms var(--ease), background var(--t-fast);
}
.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--paper); }
.nav-link[aria-current="page"]::after { background: var(--jbo-red); transform: scaleX(1); }

.hdr-cta { margin-left: auto; flex: 0 0 auto; }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(10, 17, 32, .74);
  opacity: 0;
  transition: opacity 200ms var(--ease);
}
.nav-scrim[hidden] { display: none; }
.nav-scrim[data-open] { opacity: 1; }

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  margin-top: auto;
  background: var(--ink-900);
  border-top: 1px solid var(--ink-600);
}
.ftr-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 0 var(--gutter) 24px;
}
.ftr-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-block: 22px;
  border-bottom: 1px solid var(--ink-600);
}
@media (min-width: 820px) {
  .ftr-band {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 32px;
  }
}
.ftr-band-main { min-width: 0; }
.ftr-band-label { margin-bottom: 8px; }
.ftr-search { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ftr-input {
  flex: 1 1 260px;
  min-width: 0;
  height: 38px;
  padding: 0 12px;
  background: var(--ink-950);
  border: 1px solid var(--ink-600);
  border-radius: 2px;
  color: var(--paper);
  font-size: 14px;
  transition: border-color var(--t-fast);
}
.ftr-input::placeholder { color: rgba(156, 168, 194, .72); }
.ftr-input:focus { border-color: var(--cyan); outline: none; }
.ftr-count { font-size: 12px; color: var(--cyan); min-height: 1em; }
.ftr-band-side { text-align: left; }
@media (min-width: 820px) { .ftr-band-side { text-align: right; } }
.ftr-stamp { font-size: 13px; letter-spacing: .03em; color: var(--gold); }
.ftr-stamp-sub { margin-top: 4px; font-size: 12.5px; color: var(--mist); }

.ftr-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-block: 30px;
  border-bottom: 1px solid var(--ink-600);
}
@media (min-width: 700px) { .ftr-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1040px) {
  .ftr-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.7fr);
    gap: 34px;
  }
}
.ftr-brand { min-width: 0; }
.ftr-brand-text { margin-top: 12px; max-width: 34ch; font-size: 14px; color: var(--paper-dim); }
.ftr-note { margin-top: 10px; font-size: 12px; color: var(--mist); }
.ftr-col { min-width: 0; }
.ftr-col-title { margin-bottom: 12px; }
.ftr-links li + li { margin-top: 9px; }
.ftr-link {
  font-size: 14.5px;
  color: var(--paper-dim);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.ftr-link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.ftr-lines li { margin-bottom: 9px; font-size: 14px; color: var(--paper-dim); overflow-wrap: anywhere; }
.ftr-lines-note { max-width: 36ch; font-size: 13px; color: var(--paper-faint); }
.ftr-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  justify-content: space-between;
  padding-top: 20px;
}
.ftr-legal-line { font-size: 12.5px; color: var(--mist); }

/* =========================================================
   状态类与显现
   ========================================================= */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}
html.js-reveal [data-reveal].is-in { opacity: 1; transform: none; }

.is-hidden { display: none !important; }
.is-hit { outline: 1px solid var(--cyan); outline-offset: 3px; }

/* =========================================================
   断点：平板与手机
   ========================================================= */
@media (max-width: 980px) {
  :root { --gutter: 18px; }

  .hdr-upper .hdr-wrap { padding-block: 7px; }
  .brand-line { display: none; }
  .hdr-stamp { margin-left: 0; font-size: 11.5px; }

  .hdr-wrap--nav { min-height: 52px; justify-content: space-between; }
  .nav-toggle { display: inline-flex; }
  .hdr-cta { display: none; }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 70;
    width: min(84vw, 320px);
    padding: 78px 18px 30px;
    background: var(--ink-900);
    border-right: 1px solid var(--ink-600);
    box-shadow: 24px 0 60px rgba(0, 0, 0, .55);
    overflow-y: auto;
    transform: translateX(-101%);
    transition: transform 260ms var(--ease);
  }
  .site-nav[data-open] { transform: translateX(0); }
  .nav-panel-title { display: block; margin-bottom: 14px; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--ink-600);
  }
  .nav-link::after { left: 4px; right: auto; width: 30px; bottom: -1px; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .hdr-search { display: none; }
  .hdr-stamp { margin-left: auto; }
  .ftr-legal { flex-direction: column; gap: 6px; }
  .cell { padding: 16px; }
}

@media (min-width: 981px) {
  .site-nav { display: block; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html.js-reveal [data-reveal] { transform: none; }
  .site-nav { transition: none; }
  .btn:hover .btn-arrow { transform: none; }
}