/* ==========================================================================
   /assets/site.css — 365官方入口 共享样式
   展览画册式布局 · 深墨蓝基底 · 琥珀金入口 · 青瓷绿频道识别
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B1730;
  --ink-2: #101F3D;
  --panel: #16294D;
  --paper: #F4F1EA;
  --amber: #F2B23E;
  --amber-deep: #C98A1F;
  --celadon: #6FC7AE;
  --celadon-deep: #3D8F7A;
  --slate: #8FA0B8;
  --grid: #2B4066;
  --coral: #E36B5D;

  --font-head: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", SFMono-Regular, ui-monospace, "Courier New", monospace;

  --w-max: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --dur: 200ms;
  --line: 1px solid var(--grid);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--paper);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

p, figure, blockquote, dl, dd { margin: 0; }

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

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

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

button {
  font: inherit;
  color: inherit;
  border-radius: 0;
  background: none;
  border: 0;
}

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

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

[data-chapter] { scroll-margin-top: 130px; }

/* ---------- 3. 通用工具 ---------- */
.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;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 820px; }

#main-content { display: block; }

/* ---------- 4. 分区 ---------- */
.band { padding: clamp(48px, 7vw, 96px) 0; }
.band--ink { background: var(--ink); color: var(--paper); }
.band--ink2 { background: var(--ink-2); color: var(--paper); }
.band--paper { background: var(--paper); color: var(--ink); }
.band--paper :focus-visible { outline-color: var(--ink-2); }

/* ---------- 5. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

@media (max-width: 860px) {
  .grid--2,
  .grid--3,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 6. 章节头与序号 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--celadon);
}

.idx {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 500;
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--grid);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: clamp(24px, 3vw, 40px);
  border-bottom: var(--line);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--dur) ease, color var(--dur) ease,
              border-color var(--dur) ease, transform var(--dur) ease;
}

.btn--amber {
  background: var(--amber);
  color: var(--ink);
  border-color: var(--amber);
}
.btn--amber:hover {
  background: var(--amber-deep);
  border-color: var(--amber-deep);
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--grid);
}
.btn--ghost:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.btn:active { transform: translateY(1px); }

/* ---------- 8. 说明牌与标签 ---------- */
.plate {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--slate);
}
.plate--amber { border-color: var(--amber-deep); color: var(--amber); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate);
}
.tag--celadon { color: var(--celadon); border-color: var(--celadon-deep); }
.tag--amber { color: var(--amber); border-color: var(--amber-deep); }
.tag--coral { color: var(--coral); border-color: var(--coral); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--grid);
}
.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.breadcrumb a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 10. 图片容器（页面阶段放置图片） ---------- */
.figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
  overflow: hidden;
}
.figure__media {
  position: relative;
  aspect-ratio: 16 / 10;
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(0deg, rgba(43, 64, 102, 0.5) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(43, 64, 102, 0.5) 0 1px, transparent 1px 32px);
}
.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure--tall .figure__media { aspect-ratio: 4 / 5; }
.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure__caption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-top: var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}
.figure__caption b {
  font-weight: 500;
  color: var(--amber);
}

/* ---------- 11. 正文 ---------- */
.prose { max-width: 72ch; }
.prose p { margin-bottom: 1.15em; line-height: 1.8; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose ul,
.prose ol {
  margin-bottom: 1.2em;
  padding-left: 1.4em;
}
.prose li { margin-bottom: 0.4em; }
.prose h2 { margin: 2em 0 0.6em; font-size: 28px; }
.prose h3 { margin: 1.6em 0 0.5em; font-size: 20px; }
.prose a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.band--paper .prose a { color: var(--amber-deep); }

/* ---------- 12. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  transition: top var(--dur) ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 13. 页头命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--grid);
}

.cmd-strip {
  background: var(--ink-2);
  border-bottom: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.cmd-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 8px var(--gutter);
}

.cmd-path {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--slate);
}

.cmd-path__dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--amber);
}

.cmd-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--celadon);
  font-size: 11px;
  letter-spacing: 0.12em;
  margin: 0;
}

.cmd-status__dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--celadon);
}

.cmd-utility {
  display: flex;
  align-items: center;
  gap: 18px;
}

.cmd-utility a {
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.cmd-utility a:hover {
  color: var(--paper);
  border-bottom-color: var(--amber);
}

.cmd-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  color: var(--paper);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand__name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.brand__line {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--grid);
  color: var(--paper);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}
.nav-toggle:hover { border-color: var(--celadon); color: var(--celadon); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) ease, opacity var(--dur) ease;
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle__label { font-size: 12px; }

/* 主导航 */
.primary-nav { display: block; }
.primary-nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
}
.primary-nav__item { display: block; }

.nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color var(--dur) ease;
}
.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate);
  transition: color var(--dur) ease;
}
.nav-link:hover { color: var(--amber); }
.nav-link:hover .nav-link__idx { color: var(--amber); }

.nav-link[aria-current="page"] { color: var(--amber); }
.nav-link[aria-current="page"] .nav-link__idx { color: var(--amber); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--amber);
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.read-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--celadon), var(--amber));
  transition: width 120ms linear;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid var(--grid);
}

.footer-top {
  background: var(--ink-2);
  border-bottom: 1px solid var(--grid);
  padding: clamp(32px, 5vw, 64px) 0;
}
.footer-top__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-brand { max-width: 540px; }
.footer-brand__mark {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 8px;
  border: 1px solid var(--celadon-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--celadon);
}
.footer-brand__title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: -0.01em;
}
.footer-brand__note {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}
.footer-cta { flex: 0 0 auto; }

.footer-main { padding: clamp(28px, 4vw, 52px) 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: clamp(24px, 4vw, 56px);
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--celadon);
}
.footer-col__num { color: var(--slate); }

.footer-links { display: grid; gap: 10px; font-size: 14px; }
.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.footer-links a::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--slate);
  transition: width var(--dur) ease, background var(--dur) ease;
}
.footer-links a:hover { color: var(--amber); }
.footer-links a:hover::before { width: 14px; background: var(--amber); }

.footer-contact__list { display: grid; gap: 2px; }
.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--grid);
}
.contact-label {
  flex: 0 0 52px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--slate);
}
.contact-value {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 14px;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.copy-btn {
  flex: 0 0 auto;
  padding: 4px 9px;
  border: 1px solid var(--grid);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}
.copy-btn:hover { border-color: var(--celadon); color: var(--celadon); }

.footer-note {
  margin-top: 16px;
  max-width: 46ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate);
}

.footer-bottom {
  background: var(--ink-2);
  border-top: 1px solid var(--grid);
}
.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 18px var(--gutter);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate);
}
.footer-copyright { margin: 0; }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
}
.footer-meta a {
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.footer-meta a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}
.footer-legal { margin: 0; color: var(--celadon); }

/* ---------- 15. 显现 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms ease, transform 420ms ease;
}
.has-js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 平板 ---------- */
@media (max-width: 1080px) {
  .nav-link { padding: 10px 9px; font-size: 13px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
}

/* ---------- 17. 移动 ---------- */
@media (max-width: 900px) {
  html { scroll-padding-top: 148px; }

  .nav-toggle { display: inline-flex; }

  .cmd-main { padding: 12px var(--gutter); gap: 12px; }

  .primary-nav {
    display: none;
    flex-basis: 100%;
    width: 100%;
    margin-left: 0;
    border-top: 1px solid var(--grid);
  }
  .site-header[data-open] .primary-nav { display: block; }

  .primary-nav__list {
    flex-direction: column;
    gap: 0;
    padding: 4px 0 14px;
  }
  .nav-link {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 14px 0;
    font-size: 16px;
    border-bottom: 1px solid rgba(43, 64, 102, 0.5);
  }
  .nav-link__idx { font-size: 11px; }
  .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    bottom: 10px;
    width: 18px;
    height: 2px;
  }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact { grid-column: auto; }
  .footer-bottom__inner { justify-content: flex-start; }
}

@media (max-width: 640px) {
  .cmd-status { display: none; }
  .cmd-strip__inner { font-size: 11px; gap: 6px 14px; }
  .brand__line { display: none; }
  .footer-top__inner { align-items: flex-start; }
  .contact-label { flex-basis: 100%; }
}

/* ---------- 18. 减少动态效果 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .read-progress__bar { transition: none; }
  .btn:active { transform: none; }
}