/* ==========================================================================
   九洲平台 · 共享样式 /assets/site.css
   视觉体系：数字档案馆 · 版本档案 · 暖纸与墨蓝
   ========================================================================== */

/* ---------- 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, h6,
p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1F33;
  --ink-2: #12314F;
  --cyan: #0FA3A3;
  --cyan-soft: #8FD9D6;
  --orange: #F26B2B;
  --orange-soft: #FFC29E;
  --paper: #F7F1E6;
  --card: #FFFDF8;
  --graphite: #3C4654;
  --line: #D9D2C5;
  --green: #2E8B6A;
  --red: #C44536;

  --font-sans: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --step-1: 12px;
  --step-2: 14px;
  --step-3: 16px;
  --step-4: 20px;
  --step-5: 24px;
  --step-6: 32px;
  --step-7: 40px;
  --step-8: 64px;
  --step-9: 96px;

  --maxw: 1240px;
  --gut: 20px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 200ms;

  --header-h: 106px;
}

@media (min-width: 768px) { :root { --gut: 32px; } }
@media (min-width: 1200px) { :root { --gut: 48px; --header-h: 110px; } }

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 768px) { body { font-size: 17px; } }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

strong { font-weight: 700; color: var(--ink); }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.visually-hidden {
  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;
}

/* ---------- 4. 焦点与跳转 ---------- */
:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--cyan-soft);
}

.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 200;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #FFFDF8;
  background-color: var(--orange);
}

.skip-link:focus,
.skip-link:focus-visible {
  left: 12px;
  top: 12px;
  outline-color: #FFFDF8;
}

/* ---------- 5. 布局骨架 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 8px 24px;
}

.grid {
  display: grid;
  gap: 24px;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--ink);
  border-bottom: 1px solid rgba(247, 241, 230, 0.14);
}

/* 6.1 状态轨 */
.header-rail {
  background-color: var(--ink-2);
  border-bottom: 1px solid rgba(247, 241, 230, 0.1);
  background-image: repeating-linear-gradient(
    to right,
    rgba(143, 217, 214, 0.16) 0,
    rgba(143, 217, 214, 0.16) 1px,
    transparent 1px,
    transparent 12px
  );
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: auto 4px;
}

.rail-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
  padding-block: 4px;
}

.rail-mark {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
  white-space: nowrap;
}

.rail-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(247, 241, 230, 0.74);
  min-width: 0;
}

.rail-status::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background-color: var(--green);
}

.rail-meta {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(247, 241, 230, 0.42);
  white-space: nowrap;
}

/* 6.2 主命令栏 */
.header-core { background-color: var(--ink); }

.core-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 70px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-glyph {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--cyan);
  background-color: rgba(15, 163, 163, 0.12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.brand-text { display: block; }

.brand-name {
  display: block;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: #FFFDF8;
}

.brand-line {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: rgba(247, 241, 230, 0.5);
}

/* 6.3 导航 */
.nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: stretch;
}

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(247, 241, 230, 0.72);
  border-bottom: 2px solid transparent;
  transition:
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav-index {
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(143, 217, 214, 0.62);
  transition: color var(--dur) var(--ease);
}

.nav-label { white-space: nowrap; }

.nav-link:hover {
  color: #FFFDF8;
  background-color: rgba(15, 163, 163, 0.16);
  border-bottom-color: var(--cyan);
}

.nav-link:hover .nav-index { color: var(--cyan-soft); }

.nav-link[aria-current="page"] {
  color: #FFFDF8;
  border-bottom-color: var(--orange);
  background-color: rgba(242, 107, 43, 0.1);
}

.nav-link[aria-current="page"] .nav-index { color: var(--orange-soft); }

/* 6.4 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 14px;
  border: 1px solid rgba(247, 241, 230, 0.26);
  color: #FFFDF8;
  transition:
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); background-color: rgba(15, 163, 163, 0.16); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  display: block;
  height: 1px;
  width: 100%;
  background-color: currentColor;
}

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.site-header[data-open] .nav-toggle {
  border-color: var(--cyan);
  background-color: rgba(15, 163, 163, 0.2);
}

/* 6.5 阅读进度 */
.header-progress {
  height: 2px;
  background-color: rgba(247, 241, 230, 0.12);
}

.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 90ms linear;
}

/* 6.6 中屏压缩 */
@media (min-width: 900px) and (max-width: 1140px) {
  .brand-line { display: none; }
  .nav-link { padding: 12px 9px; font-size: 13px; }
  .nav-index { display: none; }
}

/* 6.7 移动导航 */
@media (max-width: 899px) {
  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    background-color: var(--ink-2);
    border-top: 1px solid rgba(247, 241, 230, 0.12);
    border-bottom: 3px solid var(--orange);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition:
      opacity var(--dur) var(--ease),
      transform var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
  }

  .site-header[data-open] .nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list { flex-direction: column; }

  .nav-item + .nav-item { border-top: 1px solid rgba(247, 241, 230, 0.08); }

  .nav-link {
    justify-content: flex-start;
    padding: 15px 20px;
    font-size: 15px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--orange);
    background-color: rgba(15, 163, 163, 0.12);
  }

  .nav-index { font-size: 11px; }

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

  .rail-meta { display: none; }
}

@media (max-width: 639px) {
  .rail-mark { display: none; }
  .rail-status { font-size: 10px; letter-spacing: 0.04em; }
  .core-inner { min-height: 62px; gap: 12px; }
  .brand-glyph { width: 34px; height: 34px; font-size: 15px; }
  .brand-name { font-size: 16px; }
  .brand-line { display: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  background-color: var(--ink);
  color: rgba(247, 241, 230, 0.72);
}

.footer-rule {
  display: flex;
  height: 6px;
}

.rule-seg { display: block; height: 100%; }
.rule-seg--orange { flex: 0 0 18%; background-color: var(--orange); }
.rule-seg--cyan { flex: 0 0 9%; background-color: var(--cyan); }
.rule-seg--ink { flex: 1 1 auto; background-color: var(--ink-2); }

.footer-main {
  display: grid;
  gap: 40px;
  padding-block: 52px 44px;
}

.footer-wordmark {
  display: block;
  font-size: 26px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: #FFFDF8;
}

.footer-tagline {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.footer-col-title {
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(247, 241, 230, 0.16);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: rgba(247, 241, 230, 0.78);
  transition: color var(--dur) var(--ease);
}

.footer-links a::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 1px;
  background-color: var(--cyan);
  transition: width var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.footer-links a:hover { color: #FFFDF8; }
.footer-links a:hover::before { width: 20px; background-color: var(--orange); }

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-line {
  display: grid;
  gap: 2px;
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: rgba(143, 217, 214, 0.72);
}

.contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: #FFFDF8;
  word-break: break-word;
}

.contact-note {
  margin-top: 18px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.52);
  max-width: 46ch;
}

.footer-bottom {
  border-top: 1px solid rgba(247, 241, 230, 0.14);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-block: 18px;
}

.footer-legal {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(247, 241, 230, 0.46);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 14px;
  border: 1px solid rgba(247, 241, 230, 0.26);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(247, 241, 230, 0.74);
  transition:
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.to-top:hover {
  border-color: var(--orange);
  background-color: rgba(242, 107, 43, 0.18);
  color: #FFFDF8;
}

@media (min-width: 600px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 40px; }
}

@media (min-width: 900px) {
  .footer-main {
    grid-template-columns: minmax(220px, 1fr) 2.2fr;
    gap: 64px;
    padding-block: 68px 56px;
  }
}

@media (min-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

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

.btn-primary {
  background-color: var(--orange);
  color: #FFFDF8;
}
.btn-primary:hover { background-color: #D9571C; }

.btn-outline {
  border-color: var(--ink);
  color: var(--ink);
}
.btn-outline:hover { background-color: var(--ink); color: var(--paper); }

.btn-cyan {
  background-color: var(--cyan);
  color: #04262B;
}
.btn-cyan:hover { background-color: #0C8D8D; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item { color: rgba(60, 70, 84, 0.68); }

.breadcrumb-item a {
  color: var(--ink-2);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb-item a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.breadcrumb-item[aria-current="page"] { color: var(--graphite); }

/* ---------- 10. 正文容器 ---------- */
.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--graphite);
}

.prose h2 {
  margin-top: 2.2em;
  margin-bottom: 0.7em;
  font-size: 28px;
}

.prose h3 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-size: 21px;
}

.prose p { margin-bottom: 1.2em; }

.prose ul,
.prose ol {
  display: grid;
  gap: 10px;
  margin-bottom: 1.4em;
}

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

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 1px;
  background-color: var(--cyan);
}

.prose ol { counter-reset: prose-ol; }
.prose ol li::before {
  counter-increment: prose-ol;
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid currentColor;
}
.prose a:hover { color: var(--orange); border-bottom-color: var(--orange); }

/* ---------- 11. 章节头 / 卡片 / 标签 ---------- */
.section-head {
  display: grid;
  gap: 10px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--orange);
}

.section-title {
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.section-note {
  max-width: 64ch;
  font-size: 15px;
  color: rgba(60, 70, 84, 0.8);
}

.card {
  background-color: var(--card);
  border: 1px solid var(--line);
  padding: 24px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card:hover {
  border-color: var(--cyan);
  box-shadow: 0 1px 0 0 var(--cyan-soft);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  border: 1px solid var(--line);
  background-color: var(--card);
  color: var(--graphite);
}

.tag-cyan {
  border-color: rgba(15, 163, 163, 0.45);
  background-color: rgba(143, 217, 214, 0.24);
  color: #06605F;
}

.tag-orange {
  border-color: rgba(242, 107, 43, 0.45);
  background-color: rgba(255, 194, 158, 0.3);
  color: #A8431A;
}

.status-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 1px;
  background-color: var(--green);
}

.status-dot[data-state="info"] { background-color: var(--cyan); }
.status-dot[data-state="pending"] { background-color: var(--orange); }
.status-dot[data-state="warn"] { background-color: var(--red); }

/* ---------- 12. 图像容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--ink-2);
  border: 1px solid var(--line);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.media-frame--square img { aspect-ratio: 1 / 1; }
.media-frame--wide img { aspect-ratio: 21 / 9; }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
    to right,
    rgba(143, 217, 214, 0.14) 0,
    rgba(143, 217, 214, 0.14) 1px,
    transparent 1px,
    transparent 48px
  );
  mix-blend-mode: screen;
}

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(60, 70, 84, 0.62);
}

/* ---------- 13. 滚动显现 ---------- */
html.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 320ms var(--ease),
    transform 320ms var(--ease);
}

html.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 降低动效 ---------- */
@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;
  }

  html.js-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover { transform: none; }
}