/* ==========================================================================
   6686中心 · 共享站点样式 /assets/site.css
   框架式左侧导航 + 纸本奶油正文 + 琥珀金/青瓷绿功能分色
   ========================================================================== */

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

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

body { margin: 0; }

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; }

a { color: inherit; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色板 */
  --ink-deep: #0E2233;
  --ink-navy: #16344D;
  --cream: #F4EBDD;
  --cream-2: #EFE3D1;
  --amber: #D99A2B;
  --amber-soft: #F2C879;
  --celadon: #4F8F7A;
  --celadon-soft: #A8C9BC;
  --brick: #C4552D;
  --ink-brown: #241C17;
  --line: #8FA3B0;
  --paper: #FFFFFF;
  --muted: #6E6459;
  --rail-line: rgba(143, 163, 176, 0.26);
  --rail-text: #BCCCD6;

  /* 字体 */
  --font-head: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", "Source Han Serif SC", serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;

  /* 尺寸 */
  --rail-w: 272px;
  --topbar-h: 58px;
  --wrap: 1180px;
  --wrap-wide: 1400px;
  --gutter: clamp(20px, 3.4vw, 56px);
  --section-y: clamp(56px, 7vw, 112px);
  --radius: 3px;
  --shadow-soft: 0 10px 26px rgba(14, 34, 51, 0.16);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background: var(--cream);
  color: var(--ink-brown);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink-deep);
}

h1 { font-size: clamp(34px, 5vw, 68px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: 18px; }

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

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

/* ---------- 4. 容器与通用排版工具 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide { max-width: var(--wrap-wide); }
.container--narrow { max-width: 760px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--celadon);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  opacity: 0.45;
  margin-block: clamp(28px, 4vw, 56px);
}

.rule--dark {
  background: var(--rail-line);
  opacity: 1;
}

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.85;
}

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

.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }

.prose ul, .prose ol {
  padding-left: 1.35em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 143, 122, 0.5);
}

.prose a:hover { border-bottom-color: var(--celadon); }

/* ---------- 5. 卡片 / 标签 ---------- */
.card {
  display: block;
  padding: clamp(18px, 2.4vw, 30px);
  background: var(--paper);
  border: 1px solid rgba(143, 163, 176, 0.4);
  border-radius: var(--radius);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: var(--amber);
}

.card--ink {
  background: var(--ink-navy);
  border-color: var(--rail-line);
  color: var(--cream);
}

.card--ink h2,
.card--ink h3,
.card--ink h4 { color: var(--paper); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  border-radius: 2px;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.tag--fee {
  color: #7A4F0C;
  background: var(--amber-soft);
  border-color: transparent;
}

.tag--doc {
  color: #214E42;
  background: var(--celadon-soft);
  border-color: transparent;
}

.tag--alert {
  color: var(--paper);
  background: var(--brick);
  border-color: transparent;
}

/* ---------- 6. 图片容器基础（页面阶段插入图片） ---------- */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background: var(--ink-navy);
  border: 1px solid rgba(143, 163, 176, 0.35);
  border-radius: var(--radius);
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.03);
}

.img-frame--16x9 { aspect-ratio: 16 / 9; }
.img-frame--3x2  { aspect-ratio: 3 / 2; }
.img-frame--4x3  { aspect-ratio: 4 / 3; }
.img-frame--1x1  { aspect-ratio: 1 / 1; }
.img-frame--tall { aspect-ratio: 3 / 4; }

.img-frame__cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--cream);
  background: rgba(14, 34, 51, 0.82);
  border-left: 2px solid var(--amber);
  border-radius: 0 2px 2px 0;
}

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 20px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.breadcrumbs a {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.breadcrumbs a:hover { border-bottom-color: currentColor; }

.breadcrumbs__sep { color: var(--line); }

.breadcrumbs [aria-current="page"] { color: var(--ink-brown); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn--amber {
  background: var(--amber);
  color: #1B1206;
}

.btn--amber:hover {
  background: var(--amber-soft);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.22);
}

.btn--line {
  background: transparent;
  color: var(--cream);
  border-color: rgba(244, 235, 221, 0.4);
}

.btn--line:hover {
  color: var(--amber-soft);
  border-color: var(--amber);
}

.btn--ink {
  background: var(--ink-deep);
  color: var(--cream);
}

.btn--ink:hover {
  background: var(--ink-navy);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

/* ---------- 9. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 16px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: #1B1206;
  background: var(--amber);
  border-radius: 2px;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.32);
  transform: translateY(-180%);
  transition: transform 0.18s ease;
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 10. 框架头部 ---------- */
.site-header {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-w);
  z-index: 100;
  background: var(--ink-deep);
  color: var(--cream);
  border-right: 1px solid var(--rail-line);
}

.rail {
  display: flex;
  flex-direction: column;
  gap: 22px;
  height: 100%;
  padding: 28px 20px 22px;
  overflow-y: auto;
  scrollbar-width: thin;
}

/* 品牌 */
.brand {
  display: block;
  padding-bottom: 20px;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--rail-line);
}

.brand__mark {
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--amber);
}

.brand__name {
  display: block;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--cream);
}

.brand__tagline {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--line);
}

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cream);
  background: transparent;
  border: 1px solid var(--rail-line);
  border-radius: 2px;
  cursor: pointer;
}

.nav-toggle:hover { border-color: var(--amber); }

.nav-toggle__icon {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: top 0.2s ease, transform 0.2s ease;
}

.nav-toggle__icon::before { top: 0; }
.nav-toggle__icon::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  top: 4px;
  transform: rotate(-45deg);
}

/* 主导航 */
.site-nav {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-height: 0;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__item { display: block; }

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px 10px 10px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 500;
  color: var(--rail-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 2px 2px 0;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.site-nav__link:hover {
  background: var(--ink-navy);
  color: var(--paper);
  border-left-color: var(--amber-soft);
}

.site-nav__link[aria-current="page"] {
  background: rgba(217, 154, 43, 0.14);
  color: var(--cream);
  border-left-color: var(--amber);
}

.site-nav__index {
  flex: 0 0 auto;
  min-width: 18px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: #6E8595;
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--amber);
  opacity: 1;
}

.site-nav__label { display: inline-block; }

/* 侧栏行动区 */
.rail__cta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--rail-line);
}

.rail__meta {
  margin: 0;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: #6E8595;
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink-deep);
  color: #C9D6DE;
  font-family: var(--font-head);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--amber) 0 22%,
    var(--celadon) 22% 30%,
    transparent 30%
  );
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr)) 1.6fr;
  gap: clamp(24px, 3vw, 48px);
  padding-block: clamp(52px, 6vw, 80px) clamp(32px, 4vw, 52px);
}

.footer__mark {
  display: block;
  width: 40px;
  height: 3px;
  margin-bottom: 16px;
  background: var(--amber);
}

.footer__name {
  margin-bottom: 12px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.footer__summary {
  max-width: 34ch;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.85;
  color: #A9BAC6;
}

.footer__col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__list--contact { gap: 12px; }

.footer__link {
  display: inline-block;
  padding: 2px 0;
  font-size: 14.5px;
  color: #C9D6DE;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer__link:hover {
  color: var(--amber-soft);
  border-bottom-color: var(--amber-soft);
}

.footer__contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  line-height: 1.6;
}

.footer__contact-key {
  min-width: 34px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--celadon-soft);
}

.footer__contact-val {
  font-size: 13.5px;
  color: #DCE6EC;
  word-break: break-all;
}

.copy-btn {
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: #9DB2BF;
  background: transparent;
  border: 1px solid var(--rail-line);
  border-radius: 2px;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.copy-btn:hover {
  color: var(--amber-soft);
  border-color: var(--amber);
}

.copy-btn.is-done {
  color: var(--celadon-soft);
  border-color: var(--celadon);
}

.copy-btn.is-failed {
  color: var(--amber-soft);
  border-color: var(--brick);
}

.footer__note {
  max-width: 44ch;
  margin-top: 14px;
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.75;
  color: #7E93A0;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 20px 26px;
  border-top: 1px solid var(--rail-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.footer__legal,
.footer__copyright { margin: 0; }

/* ---------- 12. 阅读进度 ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  background: rgba(143, 163, 176, 0.16);
}

.reading-progress__bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--celadon), var(--amber));
}

/* ---------- 13. 滚动显现 ---------- */
[data-reveal] {
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(12px);
}

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

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-h);
  }

  .site-header {
    inset: 0 0 auto 0;
    width: auto;
    border-right: 0;
    border-bottom: 1px solid var(--rail-line);
  }

  .rail {
    flex-direction: row;
    align-items: center;
    gap: 14px;
    height: var(--topbar-h);
    padding: 0 16px;
    overflow: visible;
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .brand__mark { display: none; }

  .brand__name {
    font-size: 17px;
    line-height: 1.1;
  }

  .brand__tagline { display: none; }

  .nav-toggle {
    display: inline-flex;
    flex: 0 0 auto;
  }

  .site-nav {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    flex: none;
    max-height: calc(100vh - var(--topbar-h));
    padding: 16px 16px 24px;
    overflow-y: auto;
    background: var(--ink-deep);
    border-bottom: 1px solid var(--rail-line);
    box-shadow: 0 20px 44px rgba(0, 0, 0, 0.4);
  }

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

  .site-nav__link { padding: 12px 12px 12px 10px; }

  .rail__cta {
    margin-top: 18px;
    padding-top: 18px;
  }

  .rail__meta { display: none; }

  .reading-progress {
    left: 0;
    top: var(--topbar-h);
  }

  .footer__top {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer__brand,
  .footer__contact {
    grid-column: 1 / -1;
  }

  .footer__summary,
  .footer__note { max-width: 60ch; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .brand__name { font-size: 16px; }

  .footer__top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 20px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .tag { font-size: 10.5px; }
}

/* ---------- 15. 减少动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .skip-link { transition: none; }

  [data-reveal].is-hidden {
    opacity: 1;
    transform: none;
  }
}