/* ============================================
   6686官方版 — 全局共享样式
   设计基调：暗黑科技 × 东方画册 × 档案系统
   ============================================ */

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

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

body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd,
ul,
ol {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

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

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

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

a {
  color: inherit;
}

::selection {
  background: rgba(201, 162, 39, 0.32);
  color: #ffffff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #0a1128;
}

::-webkit-scrollbar-thumb {
  background: #1d2a4a;
  border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background: #c9a227;
}

/* ---------- 全局变量 ---------- */
:root {
  --bg: #0a1128;
  --bg-elevated: #101b3a;
  --gold: #c9a227;
  --gold-soft: #e0c46f;
  --crimson: #b22222;
  --text-main: #e6e9f0;
  --text-sub: #9aa3b2;
  --line: rgba(255, 255, 255, 0.12);
  --shadow-soft: rgba(0, 0, 0, 0.4);
  --header-h: 68px;
  --container: 1200px;
  --font-heading: Georgia, "Songti SC", "SimSun", serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 3px;
}

/* ---------- 基础排版与全局背景 ---------- */
body {
  font-family: var(--font-body);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse at 100% 0%, rgba(201, 162, 39, 0.07), transparent 45%),
    radial-gradient(ellipse at 0% 100%, rgba(16, 27, 58, 0.75), transparent 55%);
  background-attachment: fixed;
  color: var(--text-main);
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--text-main);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
}

p {
  line-height: 1.65;
}

a {
  transition: color 0.2s ease;
}

:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 2px;
}

/* ---------- 通用容器 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.narrow-container {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- 跳转链接与焦点可见 ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  background: var(--gold);
  color: var(--bg);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  text-decoration: none;
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}

.skip-link:focus-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ---------- 按钮系统 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.35rem;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
  white-space: nowrap;
}

.btn--compact {
  padding: 0.45rem 0.95rem;
  font-size: 0.76rem;
}

.btn--primary {
  background: var(--gold);
  border-color: var(--gold);
  color: #0a1128;
  font-weight: 600;
}

.btn--primary:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
  color: #0a1128;
  box-shadow: 0 2px 18px rgba(201, 162, 39, 0.28);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(201, 162, 39, 0.55);
  color: var(--gold-soft);
}

.btn--ghost:hover {
  background: rgba(201, 162, 39, 0.1);
  border-color: var(--gold);
  color: var(--gold);
}

.btn--crimson {
  background: rgba(178, 34, 34, 0.16);
  border-color: rgba(178, 34, 34, 0.55);
  color: #e8b0b0;
}

.btn--crimson:hover {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #ffffff;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--text-sub);
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
  margin-bottom: 2.5rem;
}

.breadcrumb a {
  color: var(--gold-soft);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--gold);
}

.breadcrumb li + li::before {
  content: "⁄";
  color: var(--text-sub);
  opacity: 0.6;
  margin-right: 0.5rem;
}

/* ---------- 品牌字标 ---------- */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__mark {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.02em;
  line-height: 1;
}

.brand__text {
  font-size: 1rem;
  color: var(--text-main);
  letter-spacing: 0.08em;
  font-weight: 500;
}

.brand__badge {
  display: inline-block;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.5);
  padding: 2px 7px;
  white-space: nowrap;
  vertical-align: middle;
}

.brand--footer .brand__mark {
  font-size: 2.1rem;
}

.brand--footer .brand__text {
  font-size: 1.08rem;
  letter-spacing: 0.14em;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 17, 40, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 85% -20%, rgba(201, 162, 39, 0.12), transparent 50%);
  pointer-events: none;
}

.header__inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  height: var(--header-h);
  padding: 0 1.5rem;
  z-index: 2;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ---------- 语言切换 ---------- */
.lang-toggle {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--text-sub);
  padding: 0.4rem 0.7rem;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.lang-toggle:hover {
  color: var(--gold-soft);
}

.lang-toggle[aria-pressed="true"] {
  color: var(--gold);
  border-color: var(--line);
  background: rgba(201, 162, 39, 0.08);
}

/* ---------- 命令栏导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  counter-reset: nav-index;
}

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

.site-nav__item a {
  display: inline-block;
  padding: 0.6rem 0.9rem;
  font-size: 0.8rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-sub);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav__item a::before {
  content: counter(nav-index, decimal-leading-zero);
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--gold);
  opacity: 0.7;
  margin-right: 5px;
  vertical-align: top;
}

.site-nav__item a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

.site-nav__item a[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
  font-weight: 600;
}

/* ---------- 移动导航触发按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  background: rgba(16, 27, 58, 0.8);
  border: 1px solid var(--line);
  color: var(--text-main);
  font-size: 0.78rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  transition: border-color 0.2s, color 0.2s;
}

.nav-toggle:hover {
  border-color: rgba(201, 162, 39, 0.5);
  color: var(--gold-soft);
}

.nav-toggle__icon {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--text-main);
  transition: background 0.2s;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-main);
  transition: transform 0.25s;
}

.nav-toggle__icon::before {
  top: -5px;
}

.nav-toggle__icon::after {
  top: 5px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  transform: translateY(5px) rotate(45deg);
  background: var(--gold-soft);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  transform: translateY(-5px) rotate(-45deg);
  background: var(--gold-soft);
}

/* ---------- 页头滚动进度条 ---------- */
.header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.04);
  z-index: 3;
}

.header__progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.55), var(--gold) 50%, var(--gold-soft));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: #070d1e;
  border-top: 1px solid rgba(201, 162, 39, 0.4);
  margin-top: 4rem;
  padding-top: 3rem;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 162, 39, 0.7), rgba(178, 34, 34, 0.5), transparent);
  pointer-events: none;
}

.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: 2.5rem;
  padding-bottom: 2.75rem;
}

.footer__brand {
  max-width: 36rem;
}

.footer__tagline {
  margin: 0.9rem 0 0.6rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-sub);
  max-width: 46ch;
}

.footer__trust {
  font-size: 0.78rem;
  color: var(--gold-soft);
  border-left: 2px solid var(--gold);
  padding-left: 0.8rem;
  margin: 0.75rem 0 0;
  line-height: 1.6;
}

.footer__heading {
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.9rem;
  font-weight: 600;
}

.footer__links li {
  margin-bottom: 0.55rem;
}

.footer__links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer__links a:hover {
  color: var(--gold-soft);
}

.footer__col--feedback {
  border-left: 2px solid rgba(201, 162, 39, 0.8);
  padding-left: 1.5rem;
  position: relative;
}

.footer__col--feedback::before {
  content: "反馈";
  position: absolute;
  top: -0.45rem;
  left: -2px;
  background: var(--gold);
  color: #0a1128;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 2px 8px;
}

.footer__note {
  font-size: 0.82rem;
  color: var(--text-sub);
}

.footer__contact {
  margin: 0.6rem 0 0.85rem;
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer__contact span {
  color: var(--text-sub);
  letter-spacing: 0.04em;
}

.footer__email {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.45);
  transition: border-color 0.2s, color 0.2s;
}

.footer__email:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--text-sub);
}

.footer__address {
  font-style: normal;
}

.footer__icp {
  letter-spacing: 0.04em;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 60;
  background: rgba(201, 162, 39, 0.14);
  border: 1px solid rgba(201, 162, 39, 0.5);
  color: var(--gold-soft);
  padding: 0.55rem 1.05rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s, background 0.2s, color 0.2s;
}

.back-to-top:hover {
  background: var(--gold);
  color: #0a1128;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ---------- 段落与区块标题 ---------- */
.section-block {
  padding: 3rem 0;
  border-bottom: 1px solid var(--line);
}

.section-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.section-grid__aside {
  border-top: 2px solid var(--gold);
  padding-top: 0.7rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text-sub);
  letter-spacing: 0.07em;
}

.section-grid__content {
  min-width: 0;
}

.section__index {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 0.28rem;
  margin-bottom: 0.75rem;
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 2.6vw, 2.6rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: 0.03em;
  color: var(--text-main);
}

.lede {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.75;
  max-width: 58ch;
}

/* ---------- 基础网格 ---------- */
.grid {
  display: grid;
  gap: 1.25rem;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

/* ---------- 档案系统 ---------- */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.entry-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  padding: 1.3rem 1.4rem;
  box-shadow: 0 2px 14px var(--shadow-soft);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.entry-card:hover {
  transform: translateY(-2px);
  border-top-color: var(--gold-soft);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
}

.entry-card__tag {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.45);
  padding: 2px 9px;
  border-radius: 999px;
  margin-bottom: 0.9rem;
}

.entry-card__title {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.entry-card__meta {
  font-size: 0.8rem;
  color: var(--text-sub);
  letter-spacing: 0.03em;
  line-height: 1.6;
}

.index-tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-soft);
  border: 1px solid rgba(201, 162, 39, 0.45);
  padding: 2px 10px;
  border-radius: 999px;
}

/* ---------- 图片框架 ---------- */
.figure-frame {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: 0 2px 14px var(--shadow-soft);
}

.figure-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.figure-frame > *:first-child {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(201, 162, 39, 0.13) 0%, transparent 45%);
  pointer-events: none;
}

.figure-frame.aspect-4x3::before {
  padding-top: 75%;
}

.figure-frame.aspect-1x1::before {
  padding-top: 100%;
}

/* ---------- 提示条 ---------- */
.notice {
  border-left: 3px solid var(--gold);
  background: rgba(201, 162, 39, 0.07);
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-main);
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.notice--danger {
  border-left-color: var(--crimson);
  background: rgba(178, 34, 34, 0.08);
}

/* ---------- 平板与紧凑桌面 ---------- */
@media (max-width: 1024px) {
  .site-nav__item a {
    padding: 0.55rem 0.7rem;
    font-size: 0.75rem;
  }

  .lang-toggle {
    display: none;
  }

  .footer__top {
    grid-template-columns: 1.4fr 1fr;
  }

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

  .section-grid {
    grid-template-columns: 160px 1fr;
    gap: 1.75rem;
  }
}

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  :root {
    --header-h: 62px;
  }

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

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(340px, 88vw);
    background: var(--bg-elevated);
    border-left: 1px solid var(--line);
    padding: 1.25rem 1.5rem 2rem;
    overflow-y: auto;
    align-items: flex-start;
    visibility: hidden;
    transform: translateX(100%);
    transition: transform 0.3s ease, visibility 0.3s;
    box-shadow: -12px 0 30px rgba(0, 0, 0, 0.45);
  }

  .site-nav[data-open="true"] {
    visibility: visible;
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .site-nav__item a {
    display: block;
    padding: 0.85rem 0.6rem;
    font-size: 0.95rem;
    text-transform: none;
    border-bottom: 1px solid var(--line);
    letter-spacing: 0.05em;
  }

  .site-nav__item a[aria-current="page"] {
    color: var(--gold);
    border-bottom-color: rgba(201, 162, 39, 0.5);
    background: rgba(201, 162, 39, 0.05);
  }

  .brand__badge {
    display: none;
  }

  .footer__top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer__brand {
    grid-column: auto;
  }

  .footer__col--feedback {
    border-left: 0;
    border-top: 2px solid rgba(201, 162, 39, 0.8);
    padding-left: 0;
    padding-top: 1.1rem;
  }

  .footer__col--feedback::before {
    left: 0;
  }

  .section-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

/* ---------- 小屏手机补充 ---------- */
@media (max-width: 640px) {
  .header__inner {
    padding: 0 1rem;
    gap: 0.75rem;
  }

  .brand__mark {
    font-size: 1.4rem;
  }

  .brand__text {
    font-size: 0.85rem;
  }

  .header__actions .btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.7rem;
  }

  .nav-toggle {
    padding: 0.45rem 0.7rem;
  }

  .footer__inner {
    padding: 0 1rem;
  }
}

/* ---------- 减少动态效果 ---------- */
@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;
  }
}

/* ---------- 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}