/* =========================================================
   365安卓客 · 全站共享样式 /assets/site.css
   暖白画布 · 硬边框 · 无衬线报头 · 功能色语义分区
   ========================================================= */

:root {
  --signal: #2FD07A;
  --signal-ink: #0B5B34;
  --graphite: #191C1B;
  --paper: #FAF7F0;
  --lift: #FFFFFF;
  --amber: #F2A31B;
  --amber-ink: #8A5600;
  --mist: #7FA8C0;
  --mist-ink: #2F5D75;
  --snow: #E4E7E2;
  --coral: #FF5A3C;

  --ink-soft: #4A504C;

  --line: 3px;
  --shadow-hard: 6px 8px 0 var(--graphite);
  --shadow-sm: 3px 4px 0 var(--graphite);

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-ui: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image: radial-gradient(circle at 1px 1px, rgba(25, 28, 27, 0.08) 1.1px, transparent 1.9px);
  background-size: 36px 36px;
  color: var(--graphite);
  font-family: var(--font-ui);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

p { margin: 0; }

a { color: inherit; }

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

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

button { font: inherit; color: inherit; }

figure { margin: 0; }

::selection { background: var(--signal); color: var(--graphite); }

:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 3px;
}

/* ---------- 骨架 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 300;
  padding: 12px 24px;
  background: var(--graphite);
  color: var(--signal);
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border: var(--line) solid var(--signal);
  transform: translate(-50%, -140%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 12px);
  outline: 3px solid var(--signal);
  outline-offset: 2px;
}

/* ---------- 页头：信息带 ---------- */
.site-header {
  position: relative;
  z-index: 40;
  background: var(--paper);
}

.header-strip {
  background: var(--graphite);
  color: var(--paper);
}

.header-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-block: 11px;
}

.header-strip__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.header-strip__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 胶囊 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 15px;
  font-family: var(--font-ui);
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  color: var(--graphite);
  background: var(--lift);
  border: 2px solid var(--graphite);
  box-shadow: 2px 2px 0 var(--signal-ink);
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease), background-color 0.16s var(--ease);
}

.chip--signal {
  background: var(--signal);
  border-color: var(--signal-ink);
  box-shadow: 2px 2px 0 var(--signal-ink);
}

.chip--amber {
  background: var(--amber);
  border-color: var(--amber-ink);
  box-shadow: 2px 2px 0 var(--amber-ink);
}

.chip:hover {
  transform: translate(-1px, -2px);
  box-shadow: 4px 4px 0 var(--signal-ink);
}

.chip--amber:hover { box-shadow: 4px 4px 0 var(--amber-ink); }

/* ---------- 页头：居中刊头 ---------- */
.masthead {
  position: relative;
  background: var(--paper);
}

.masthead__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-block: clamp(22px, 3.6vw, 38px) clamp(16px, 2.6vw, 26px);
  text-align: center;
}

.masthead__brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--graphite);
}

.masthead__word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 78px);
  line-height: 1;
  letter-spacing: -0.005em;
  box-shadow: inset 0 -0.1em 0 0 transparent;
  transition: box-shadow 0.2s var(--ease);
}

.masthead__brand:hover .masthead__word,
.masthead__brand:focus-visible .masthead__word {
  box-shadow: inset 0 -0.1em 0 0 var(--signal);
}

.masthead__sub {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--mist-ink);
}

/* ---------- 页头：移动端按钮 ---------- */
.nav-toggle {
  position: absolute;
  top: clamp(16px, 3vw, 30px);
  right: var(--gutter);
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--graphite);
  background: var(--lift);
  border: 3px solid var(--graphite);
  box-shadow: 3px 3px 0 var(--graphite);
  cursor: pointer;
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease), background-color 0.16s var(--ease);
}

.nav-toggle__text { line-height: 1; }

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--graphite);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--graphite);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--graphite); }
.nav-toggle:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--graphite); }

.site-header[data-open] .nav-toggle {
  background: var(--signal);
  box-shadow: 1px 1px 0 var(--graphite);
  transform: translate(2px, 2px);
}

/* ---------- 页头：标签栏导航 ---------- */
.site-nav {
  background: var(--paper);
  border-block: 3px solid var(--graphite);
}

.site-nav__rail {
  display: flex;
  justify-content: center;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
}

.site-nav__list {
  display: flex;
  flex: 0 0 auto;
  gap: 8px;
  margin: 0;
  padding: 13px 0;
  scroll-snap-type: x proximity;
}

.site-nav__item {
  flex: 0 0 auto;
  scroll-snap-align: center;
}

.site-nav__link {
  display: block;
  padding: 9px 18px;
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  white-space: nowrap;
  text-decoration: none;
  color: var(--graphite);
  background: transparent;
  border: 2px solid transparent;
  transition: background-color 0.16s var(--ease), border-color 0.16s var(--ease), box-shadow 0.16s var(--ease), transform 0.16s var(--ease);
}

.site-nav__link:hover {
  background: var(--lift);
  border-color: var(--graphite);
}

.site-nav__link[aria-current="page"] {
  background: var(--signal);
  border-color: var(--graphite);
  box-shadow: var(--shadow-sm);
  color: var(--graphite);
}

.site-nav__link[aria-current="page"]:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 6px 0 var(--graphite);
}

.site-nav__link:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 2px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
  color: var(--graphite);
  background: var(--signal);
  border: 3px solid var(--graphite);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease), background-color 0.16s var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 7px 0 var(--graphite);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--graphite);
}

.btn--amber { background: var(--amber); }
.btn--ink { background: var(--graphite); color: var(--paper); box-shadow: 3px 4px 0 var(--signal); }
.btn--ink:hover { box-shadow: 6px 7px 0 var(--signal); }
.btn--ghost { background: var(--lift); }
.btn--sm { padding: 9px 16px; font-size: 14px; border-width: 2px; box-shadow: 2px 3px 0 var(--graphite); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist-ink);
}

.breadcrumb a {
  color: var(--mist-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--mist);
}

.breadcrumb a:hover { color: var(--graphite); border-bottom-color: var(--signal); }

.breadcrumb__sep { color: var(--mist); }

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.8;
}

.prose > * + * { margin-top: 1.05em; }

.prose h2,
.prose h3 { margin-top: 1.8em; }

.prose ul,
.prose ol {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prose li {
  position: relative;
  padding-left: 22px;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 10px;
  background: var(--signal);
  border: 2px solid var(--graphite);
}

.prose ol { counter-reset: step; }

.prose ol li::before {
  content: counter(step);
  counter-increment: step;
  width: auto;
  height: auto;
  top: 0.2em;
  padding: 0 4px;
  background: transparent;
  border: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--signal-ink);
}

.lead {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.6;
  letter-spacing: 0;
}

/* ---------- 区块标题组 ---------- */
.section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.section-head__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist-ink);
}

.section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--split { grid-template-columns: 5fr 7fr; }
.grid--reverse { grid-template-columns: 7fr 5fr; }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- 信息块 ---------- */
.plate {
  background: var(--lift);
  border: 3px solid var(--graphite);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.6vw, 32px);
}

.note {
  margin: 0;
  padding-left: 12px;
  border-left: 3px solid var(--mist);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-ink);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border: 2px solid currentColor;
  color: var(--graphite);
  background: transparent;
}

.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.u-serif {
  font-family: var(--font-display);
  font-weight: 900;
}

/* ---------- 背景色带 ---------- */
.surface--signal { background: var(--signal); }
.surface--amber { background: var(--amber); }
.surface--mist { background: var(--mist); }
.surface--snow { background: var(--snow); }

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--snow);
  border: 3px solid var(--graphite);
  box-shadow: var(--shadow-hard);
}

.media-frame > img,
.media-frame > picture > img,
.media-frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame--plate {
  background-color: var(--snow);
  background-image: radial-gradient(circle at 1px 1px, rgba(25, 28, 27, 0.18) 1.2px, transparent 1.9px);
  background-size: 18px 18px;
}

.media-caption {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist-ink);
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(64px, 9vw, 120px);
  border-top: 3px solid var(--graphite);
  background: var(--paper);
}

.footer-flag {
  background: var(--graphite);
  color: var(--paper);
}

.footer-flag__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 32px;
  padding-block: clamp(30px, 4.4vw, 50px);
}

.footer-flag__brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.footer-flag__dot { color: var(--signal); }

.footer-flag__line {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--snow);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 44px);
  padding-block: clamp(34px, 4.6vw, 60px);
}

.footer-col__title {
  display: inline-block;
  margin: 0 0 16px;
  padding-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--graphite);
  border-bottom: 3px solid var(--signal);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.footer-col__list li {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.footer-col a {
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 2px solid var(--snow);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.footer-col a:hover {
  color: var(--signal-ink);
  border-bottom-color: var(--signal);
}

.footer-col__list--plain li { color: var(--mist-ink); }

.footer-col__mono {
  font-family: var(--font-mono);
  font-size: 12.5px !important;
  letter-spacing: 0.02em;
  color: var(--mist-ink);
}

.footer-meta {
  background: var(--lift);
  border-top: 2px solid var(--snow);
}

.footer-meta__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 28px;
  padding-block: 16px 18px;
}

.footer-meta__copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--mist-ink);
}

.footer-meta__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist-ink);
}

.footer-rule {
  height: 14px;
  border-top: 3px solid var(--graphite);
  background: linear-gradient(
    90deg,
    var(--signal) 0 34%,
    var(--amber) 34% 62%,
    var(--mist) 62% 86%,
    var(--coral) 86% 100%
  );
}

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  z-index: 90;
  pointer-events: none;
  background: transparent;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--signal) 0 60%, var(--amber) 100%);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    border-top: 3px solid var(--graphite);
  }

  .site-header[data-open] .site-nav { display: block; }

  .site-nav__rail { justify-content: stretch; }

  .site-nav__list {
    flex-direction: column;
    width: 100%;
    gap: 8px;
    padding: 14px 0 18px;
    scroll-snap-type: none;
  }

  .site-nav__item { width: 100%; }

  .site-nav__link {
    width: 100%;
    background: var(--lift);
    border-color: var(--graphite);
    box-shadow: 2px 3px 0 var(--graphite);
    font-size: 16px;
    padding: 12px 16px;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--signal);
    box-shadow: 2px 3px 0 var(--graphite);
  }

  .grid--split,
  .grid--reverse { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }

  .header-strip__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-block: 12px;
  }

  .header-strip__actions { width: 100%; }

  .chip {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
    white-space: normal;
    font-size: 13px;
  }

  .masthead__inner { padding-block: 20px 18px; gap: 6px; }

  .masthead__sub { font-size: 11px; letter-spacing: 0.08em; }

  .nav-toggle { top: 16px; right: var(--gutter); padding: 9px 11px; }

  .footer-flag__inner { flex-direction: column; align-items: flex-start; }

  .footer-grid { grid-template-columns: 1fr; }

  .footer-meta__inner { flex-direction: column; align-items: flex-start; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .chip:hover,
  .nav-toggle:hover,
  .site-nav__link[aria-current="page"]:hover { transform: none; }

  .scroll-progress__bar { transition: none !important; }
}