/* ==========================================================================
   安信中心 — 共享样式表 /assets/site.css
   档案系统 + 精密仪器：墨绿、暖金、粗边、硬阴影、零圆角
   ========================================================================== */

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

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

body { margin: 0; }

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

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

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

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

a { color: inherit; }

table { border-collapse: collapse; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 品牌色板 */
  --ink-green: #0B3B2E;
  --ink-deep: #071F18;
  --gold: #C9A96E;
  --gold-light: #E3D2B0;
  --gold-dim: rgba(227, 210, 176, 0.62);
  --mist: #E8E6E1;
  --paper: #F7F5F0;
  --graphite: #2A2A28;
  --alert: #8B3A3A;
  --slate: #6E7A73;
  --copper: #A87C4A;

  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 布局 */
  --shell: 1280px;
  --gutter: clamp(1.1rem, 4vw, 3rem);
  --rule: 2px;

  /* 硬阴影 */
  --shadow-sm: 4px 4px 0 var(--ink-deep);
  --shadow-md: 8px 8px 0 var(--ink-deep);
  --shadow-gold: 6px 6px 0 rgba(7, 31, 24, 0.9);

  /* 动效 */
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 200ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  color: var(--graphite);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: var(--ink-green);
}

p { text-wrap: pretty; }

strong { font-weight: 600; }

/* ---------- 4. 布局与工具类 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose { max-width: 34em; }

.mono {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.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;
}

.divider {
  height: 2px;
  background: var(--graphite);
  border: 0;
  margin-block: clamp(2rem, 4vw, 3.4rem);
}

.divider--gold { background: var(--gold); }

/* 肌理背景（页面阶段使用） */
.texture-grid {
  background-color: var(--mist);
  background-image:
    linear-gradient(rgba(110, 122, 115, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 122, 115, 0.16) 1px, transparent 1px);
  background-size: 42px 42px;
}

.texture-depth {
  background-color: var(--ink-deep);
  background-image:
    repeating-linear-gradient(135deg, rgba(201, 169, 110, 0.07) 0 2px, transparent 2px 14px);
}

/* ---------- 5. 焦点与跳过链接 ---------- */
:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--gold);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-decoration: none;
  border: 2px solid var(--ink-deep);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 1rem; }

#main-content:focus { outline: none; }

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-green);
  border-bottom: var(--rule) solid var(--ink-deep);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.site-header__bar {
  border-bottom: 1px solid rgba(227, 210, 176, 0.22);
}

.site-header__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1.2rem;
  padding-block: 1.05rem 1.15rem;
  transition: padding-block var(--dur) var(--ease);
}

.site-header[data-collapsed] .site-header__grid {
  padding-block: 0.55rem 0.6rem;
}

.header-mark {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--gold-dim);
  white-space: nowrap;
}

.header-mark--right {
  justify-self: end;
  color: var(--copper);
}

/* 刊头品牌 */
.brand {
  display: grid;
  justify-items: center;
  gap: 0.45rem;
  text-decoration: none;
  text-align: center;
}

.brand__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 2.25rem);
  letter-spacing: 0.16em;
  text-indent: 0.16em;
  line-height: 1;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.brand:hover .brand__name { color: var(--gold); }

.brand__descriptor {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  max-height: 1.8em;
  overflow: hidden;
  opacity: 1;
  transition: max-height 220ms var(--ease), opacity 160ms linear;
}

.site-header[data-collapsed] .brand__descriptor {
  max-height: 0;
  opacity: 0;
}

/* 移动抽屉按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.8rem;
  background: transparent;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { background: var(--gold); color: var(--ink-deep); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 17px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 主导航 */
.primary-nav {
  background: var(--ink-deep);
  border-bottom: var(--rule) solid var(--gold);
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  counter-reset: nav-index;
}

.primary-nav__item {
  counter-increment: nav-index;
}

.primary-nav__item + .primary-nav__item {
  border-left: 1px solid rgba(227, 210, 176, 0.16);
}

.primary-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.92rem clamp(0.85rem, 2vw, 1.5rem);
  color: var(--gold-light);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.primary-nav__link::before {
  content: counter(nav-index, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease);
}

.primary-nav__link:hover {
  color: var(--paper);
  background-color: rgba(201, 169, 110, 0.12);
}

.primary-nav__link:hover::before { color: var(--gold); }

.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after,
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.primary-nav__link[aria-current="page"] {
  color: var(--gold);
  background-color: rgba(201, 169, 110, 0.1);
}

.primary-nav__link[aria-current="page"]::before { color: var(--gold); }

/* 面包屑带 */
.crumb-bar {
  background: var(--mist);
  border-bottom: 1px solid rgba(42, 42, 40, 0.18);
}

.crumb-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.5rem;
}

.breadcrumb { min-width: 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--slate);
}

.breadcrumb__list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__list li + li::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--copper);
}

.breadcrumb__list a {
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.breadcrumb__list a:hover {
  color: var(--ink-green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumb__list [aria-current="page"] {
  color: var(--ink-green);
  font-weight: 500;
}

.crumb-bar__code {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--copper);
  white-space: nowrap;
}

/* ---------- 7. 悬浮对接卡 ---------- */
.utility-card {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 70;
  width: min(330px, calc(100vw - 2.5rem));
  background: var(--paper);
  color: var(--graphite);
  border: 2px solid var(--ink-deep);
  box-shadow: var(--shadow-gold);
}

.utility-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.55rem 0.75rem;
  background: var(--ink-green);
}

.utility-card__tag {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.utility-card__toggle {
  padding: 0.15rem 0.5rem;
  background: transparent;
  border: 1px solid var(--gold-dim);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.utility-card__toggle:hover {
  background: var(--gold);
  color: var(--ink-deep);
}

.utility-card__body {
  display: grid;
  gap: 0.7rem;
  padding: 0.9rem 0.9rem 1rem;
}

.utility-card[data-collapsed="true"] .utility-card__body { display: none; }

.utility-card__lead {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--graphite);
}

.utility-card__meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  background: var(--ink-green);
  color: var(--gold-light);
  border-top: 8px solid var(--ink-deep);
  padding-top: clamp(2.6rem, 5vw, 4rem);
}

.site-footer__main {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.95fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: 2.6rem;
  border-bottom: 1px solid rgba(201, 169, 110, 0.32);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.1;
  color: var(--paper);
}

.footer-tagline {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.footer-contact {
  display: grid;
  gap: 0.55rem;
  margin-top: 1.6rem;
  font-style: normal;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--gold-light);
}

.footer-contact__line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: baseline;
}

.footer-contact__key {
  flex: none;
  min-width: 3.2rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.footer-contact__note {
  margin-top: 0.4rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--copper);
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--gold-dim);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.footer-col__title {
  padding-bottom: 0.7rem;
  margin-bottom: 0.95rem;
  border-bottom: 1px solid rgba(201, 169, 110, 0.32);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.footer-col__list {
  display: grid;
  gap: 0.62rem;
}

.footer-col__link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.92rem;
  color: var(--gold-light);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-col__link::before {
  content: "—";
  font-size: 0.78rem;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}

.footer-col__link:hover {
  color: var(--gold);
  transform: translateX(3px);
}

.footer-col__link:hover::before { color: var(--gold); }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding-block: 1.25rem 1.5rem;
  border-bottom: 2px solid var(--gold);
  font-size: 0.78rem;
  color: var(--gold-dim);
}

.footer-legal-line { letter-spacing: 0.04em; }

.footer-domain {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--copper);
}

/* ---------- 9. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  background: transparent;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

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

.btn:active {
  transform: translate(3px, 3px);
  box-shadow: none;
}

.btn--solid {
  background: var(--gold);
  color: var(--ink-deep);
  border-color: var(--ink-deep);
  box-shadow: var(--shadow-sm);
  font-weight: 500;
}

.btn--solid:hover {
  background: var(--gold-light);
  color: var(--ink-deep);
}

.btn--block { width: 100%; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--copper);
  color: var(--copper);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.tag--alert {
  border-color: var(--alert);
  color: var(--alert);
}

.tag--solid {
  background: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--gold-light);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--mist);
  border: var(--rule) solid var(--ink-deep);
  box-shadow: var(--shadow-md);
}

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

.media-frame--ratio { aspect-ratio: 16 / 10; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__caption {
  padding: 0.5rem 0.85rem;
  background: var(--ink-deep);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
}

.stat {
  display: grid;
  gap: 0.35rem;
}

.stat__value {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 5.4rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink-green);
}

.stat__unit {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--slate);
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .site-header__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    padding-block: 0.7rem 0.75rem;
  }

  .header-mark { display: none; }

  .brand {
    justify-items: start;
    text-align: left;
  }

  .brand__name { font-size: 1.42rem; letter-spacing: 0.12em; text-indent: 0.12em; }

  .brand__descriptor { font-size: 0.6rem; letter-spacing: 0.14em; }

  .primary-nav {
    display: grid;
    grid-template-rows: 0fr;
    visibility: hidden;
    transition: grid-template-rows var(--dur) var(--ease),
                visibility 0s linear var(--dur);
  }

  .primary-nav[data-open] {
    grid-template-rows: 1fr;
    visibility: visible;
    transition: grid-template-rows var(--dur) var(--ease),
                visibility 0s linear 0s;
  }

  .primary-nav__list {
    display: grid;
    min-height: 0;
    overflow: hidden;
  }

  .primary-nav__item + .primary-nav__item {
    border-left: 0;
    border-top: 1px solid rgba(227, 210, 176, 0.16);
  }

  .primary-nav__link {
    padding: 0.95rem 0;
    font-size: 0.95rem;
  }

  .primary-nav__link::after { height: 2px; right: auto; width: 56px; }

  .crumb-bar__inner { padding-block: 0.45rem; }

  .site-footer__main {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.4rem;
  }
}

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

  .footer-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem 1.4rem;
  }

  .crumb-bar__code { display: none; }

  .utility-card {
    right: 0.75rem;
    bottom: 0.75rem;
    width: min(300px, calc(100vw - 1.5rem));
  }

  .site-footer__legal {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 420px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 11. 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;
    transition-delay: 0s !important;
  }

  .footer-col__link:hover { transform: none; }
  .btn:active { transform: none; }
}