/* ============================================================
   365 登录指南 · 共享样式表 /assets/site.css
   设计语言：深海仪表盘 —— 直角面板 / 1px 网格 / 发光状态点
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
dl, dt, dd, ul, ol { margin: 0; }

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

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

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

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

table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 深海蓝 */
  --c-abyss: #071A2F;
  --c-panel: #0E2E4F;
  --c-grid: #14456F;
  --c-grid-dim: #0F3255;
  /* 珊瑚橙 */
  --c-coral: #FF6B45;
  --c-coral-soft: #FFB199;
  /* 薄荷绿 */
  --c-mint: #3FD8A8;
  /* 奶油纸与深棕黑 */
  --c-paper: #F3EDE2;
  --c-ink: #1B1410;
  /* 文字 */
  --c-text: #E9F0F6;
  --c-fog: #8FA3B8;
  --c-fog-dim: #5F7B96;
  /* 字体 */
  --font-cn: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  /* 版式 */
  --wrap-max: 1280px;
  --gut: 24px;
  --step: 8px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (max-width: 720px) {
  :root { --gut: 16px; }
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  background-color: var(--c-abyss);
  color: var(--c-text);
  font-family: var(--font-cn);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.02em;
  font-stretch: condensed;
}

h1 { font-size: clamp(40px, 5.6vw, 64px); }
h2 { font-size: clamp(30px, 3.8vw, 44px); }
h3 { font-size: clamp(22px, 2.4vw, 30px); }
h4 { font-size: 22px; line-height: 1.35; }

p { margin-bottom: 1.2em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 700; }

.mono,
.num {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  font-feature-settings: "tnum" 1;
}

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

/* ---------- 4. 布局骨架 ---------- */
.wrap {
  width: 100%;
  max-width: calc(var(--wrap-max) + var(--gut) * 2);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.grid { display: grid; gap: var(--gut); }

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: 1 / -1; }

.grid--auto {
  display: grid;
  gap: var(--gut);
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
}

#main-content { scroll-margin-top: 104px; }

/* ---------- 5. 焦点与跳转 ---------- */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-coral);
  color: #1B0E08;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  transition: top .16s var(--ease);
}

.skip-link:focus {
  top: 12px;
  outline: 2px solid var(--c-paper);
  outline-offset: 2px;
}

/* ---------- 6. 页头外壳 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--c-abyss);
  border-bottom: 1px solid var(--c-grid);
}

.site-header.is-stuck {
  border-bottom-color: #1B5583;
  box-shadow: 0 14px 30px -22px rgba(0, 0, 0, .95);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: transparent;
  pointer-events: none;
  z-index: 5;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-coral) 0%, var(--c-coral-soft) 100%);
  transition: width .12s linear;
}

.site-header__bar {
  background: linear-gradient(180deg, #0A2340 0%, #071A2F 100%);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 68px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

.brand__mark {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
  color: #FFFFFF;
  padding: 10px 12px;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  border-bottom: 2px solid var(--c-coral);
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.brand:hover .brand__mark {
  background: #123657;
  border-color: var(--c-coral);
}

.brand__line {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--c-text);
  white-space: nowrap;
}

.brand__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.2;
  letter-spacing: .18em;
  color: var(--c-fog-dim);
  white-space: nowrap;
}

/* 通道状态 */
.chan-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 7px 14px;
  border: 1px solid var(--c-grid);
  background: rgba(14, 46, 79, .5);
  font-size: 12px;
  line-height: 1.6;
  flex: 0 0 auto;
}

.chan-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-mint);
  box-shadow: 0 0 0 3px rgba(63, 216, 168, .16);
  animation: chan-pulse 2.4s ease-in-out infinite;
  flex: 0 0 auto;
}

@keyframes chan-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 0 3px rgba(63, 216, 168, .16);
  }
  50% {
    opacity: .5;
    box-shadow: 0 0 0 7px rgba(63, 216, 168, .04);
  }
}

.chan-status__text {
  color: var(--c-mint);
  font-weight: 500;
  letter-spacing: .08em;
  white-space: nowrap;
}

.chan-status__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--c-fog);
  padding-left: 10px;
  border-left: 1px solid var(--c-grid);
  white-space: nowrap;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--c-grid);
  color: var(--c-text);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover { border-color: var(--c-coral); color: #FFFFFF; }

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}

.nav-toggle__bars {
  position: relative;
  flex: 0 0 auto;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

/* 命令栏导航 */
.cmdbar {
  position: relative;
  border-top: 1px solid var(--c-grid);
  background: #08192B;
}

.cmdbar__inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
}

.cmdbar__list {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  min-width: 0;
}

.cmdbar__item { display: flex; }

.cmdbar__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 13px 16px 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-fog);
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.cmdbar__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 0;
  height: 2px;
  background: var(--c-coral);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

.cmdbar__link:hover {
  color: #FFFFFF;
  background: rgba(20, 69, 111, .3);
}

.cmdbar__link:hover::after,
.cmdbar__link:focus-visible::after { transform: scaleX(1); }

.cmdbar__link[aria-current="page"] {
  color: #FFFFFF;
  background: rgba(20, 69, 111, .38);
}

.cmdbar__link[aria-current="page"]::after { transform: scaleX(1); }

.cmdbar__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: #4E7396;
  transition: color .18s var(--ease);
}

.cmdbar__link:hover .cmdbar__num,
.cmdbar__link[aria-current="page"] .cmdbar__num { color: var(--c-coral); }

.cmdbar__label { white-space: nowrap; }

.cmdbar__cta {
  align-self: center;
  margin: 8px 0;
  flex: 0 0 auto;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.4;
  border: 1px solid transparent;
  background: none;
  color: inherit;
  transition: background-color .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease), transform .18s var(--ease);
}

.btn--primary {
  background: var(--c-coral);
  border-color: var(--c-coral);
  color: #1B0E08;
}

.btn--primary:hover {
  background: var(--c-coral-soft);
  border-color: var(--c-coral-soft);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--c-grid);
  color: var(--c-text);
}

.btn--ghost:hover {
  border-color: var(--c-coral);
  color: #FFFFFF;
  transform: translateY(-2px);
}

/* ---------- 8. 页脚外壳 ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: #06152A;
  border-top: 1px solid var(--c-grid);
  color: var(--c-fog);
}

.site-footer > .wrap { padding-top: 56px; padding-bottom: 8px; }

.footer-top {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(0, 2.1fr) minmax(230px, 1.25fr);
  gap: 48px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--c-grid-dim);
}

.footer-brand__mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
  color: #FFFFFF;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--c-coral);
}

.footer-brand__line {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 4px;
}

.footer-brand__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-fog-dim);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-col__title,
.footer-contact__title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--c-fog-dim);
  margin-bottom: 16px;
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-col__link {
  align-self: flex-start;
  font-size: 14px;
  color: var(--c-text);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-col__link:hover {
  color: var(--c-coral-soft);
  border-bottom-color: var(--c-coral-soft);
}

.footer-contact__list { display: grid; gap: 11px; }

.footer-contact__item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.footer-contact__key {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-fog-dim);
}

.footer-contact__val {
  font-size: 14px;
  color: var(--c-text);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 18px;
  max-width: 42ch;
  font-size: 12px;
  line-height: 1.8;
  color: var(--c-fog-dim);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  padding: 20px 0 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--c-fog-dim);
}

.footer-legal p { margin: 0; }
.footer-legal__icp { color: #7B95AE; }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  font-family: var(--font-cn);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-text);
  background: rgba(8, 25, 43, .94);
  border: 1px solid var(--c-grid);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear, border-color .18s var(--ease), color .18s var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { border-color: var(--c-coral); color: #FFFFFF; }

.to-top__arrow {
  font-family: var(--font-mono);
  color: var(--c-coral);
}

/* ---------- 9. 通用组件 ---------- */
/* 面包屑 */
.breadcrumb { padding-top: 24px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  letter-spacing: .06em;
}

.breadcrumb__link {
  color: var(--c-fog);
  transition: color .18s var(--ease);
}

.breadcrumb__link:hover { color: var(--c-coral-soft); }

.breadcrumb__sep {
  font-family: var(--font-mono);
  color: #3F5C78;
}

.breadcrumb__current { color: var(--c-text); }

/* 面板 */
.panel {
  border: 1px solid var(--c-grid);
  background: var(--c-panel);
  padding: 28px;
}

.panel--paper {
  background: var(--c-paper);
  border-color: #D8CDBA;
  color: var(--c-ink);
}

.panel--paper .panel__num,
.panel--paper .index-label { color: #7A6A57; }

.panel--paper .tag {
  color: #6B5A46;
  border-color: #C9BCA7;
}

.panel__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.panel__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-coral);
}

.panel__title {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.3;
}

.panel__body { max-width: 66ch; }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--c-grid);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  line-height: 1.6;
  color: var(--c-fog);
  white-space: nowrap;
}

.tag--ok {
  color: var(--c-mint);
  border-color: rgba(63, 216, 168, .45);
}

.tag--act {
  color: var(--c-coral-soft);
  border-color: rgba(255, 107, 69, .5);
}

.tag--mute {
  color: var(--c-fog-dim);
  border-color: var(--c-grid-dim);
}

/* 索引小字 */
.index-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--c-fog-dim);
}

/* 分隔线 */
.rule {
  height: 1px;
  border: 0;
  background: var(--c-grid-dim);
  margin: 0;
}

/* 图片容器 */
.fig-frame {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--c-grid);
  background: #0A2036;
  overflow: hidden;
}

.fig-frame__media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #0E2E4F 0%, #071A2F 100%);
  overflow: hidden;
}

.fig-frame__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.fig-frame__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(20, 69, 111, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 69, 111, .55) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: .5;
  mix-blend-mode: screen;
}

.fig-frame--wide .fig-frame__media { aspect-ratio: 21 / 9; }
.fig-frame--tall .fig-frame__media { aspect-ratio: 3 / 4; }

.fig-frame__cap {
  padding: 12px 16px;
  border-top: 1px solid var(--c-grid);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--c-fog);
}

/* 正文容器 */
.prose { max-width: 66ch; }
.prose--tight { max-width: 48ch; }

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
  }
  .footer-cols { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .cmdbar { display: none; }
  .cmdbar[data-open] { display: block; }

  .cmdbar__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 8px;
    padding-bottom: 20px;
  }

  .cmdbar__list { flex-direction: column; }

  .cmdbar__item { display: block; }

  .cmdbar__link {
    align-items: center;
    gap: 12px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--c-grid-dim);
  }

  .cmdbar__link::after {
    left: 0;
    right: auto;
    top: 12px;
    bottom: 12px;
    width: 3px;
    height: auto;
    transform: scaleY(0);
    transform-origin: top center;
  }

  .cmdbar__link:hover,
  .cmdbar__link[aria-current="page"] { background: none; }

  .cmdbar__cta {
    align-self: stretch;
    margin: 18px 0 0;
  }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-6, .col-8 { grid-column: 1 / -1; }

  .site-footer { margin-top: 56px; }
}

@media (max-width: 720px) {
  .chan-status__meta { display: none; }
  .site-header__inner { gap: 12px; min-height: 62px; }
  .brand__mark { font-size: 17px; padding: 8px 10px; }
  .brand__name { font-size: 14px; }
  .brand__meta { font-size: 9px; letter-spacing: .14em; }
  .chan-status { padding: 6px 10px; }
  .footer-top { gap: 32px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 20px; }
  .to-top { right: 16px; bottom: 16px; }
}

@media (max-width: 520px) {
  .chan-status__text { display: none; }
  .chan-status__dot { box-shadow: none; animation: none; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-contact__item { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .panel { padding: 20px; }
}

/* ---------- 11. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .chan-status__dot {
    animation: none;
    opacity: 1;
    box-shadow: 0 0 0 3px rgba(63, 216, 168, .16);
  }

  .btn:hover,
  .btn--primary:hover,
  .btn--ghost:hover { transform: none; }

  .to-top { transform: none; }
}