/* ==========================================================================
   皇冠主页 · 共享样式表 /assets/site.css
   负责：reset、变量、中文排版、头部、页脚、通用按钮与基础组件
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, dt {
  margin: 0;
}

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

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

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

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

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --indigo-900: #101A33;
  --indigo-850: #16223F;
  --indigo-700: #1B2A4A;
  --line: #2E4166;
  --gold: #E3B25B;
  --gold-soft: #F2D79A;
  --coral: #E8734A;
  --teal: #4FA3A5;
  --paper: #F5F1E8;
  --ink: #E8ECF5;
  --muted: #8A93A6;

  --rail: 240px;
  --wrap: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", STSong, SimSun, serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--indigo-900);
  background-image:
    radial-gradient(900px 520px at 12% -8%, rgba(79, 163, 165, .10), transparent 62%),
    radial-gradient(760px 460px at 96% 4%, rgba(227, 178, 91, .09), transparent 60%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { max-width: 46em; }

small { font-size: 13px; color: var(--muted); }

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

/* ---------- 布局容器 ---------- */
.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(3rem, 7vw, 6rem); }

.layout {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.rail {
  border-left: 1px solid var(--line);
  padding-left: 1.25rem;
}

.stack > * + * { margin-top: 1rem; }

.measure { max-width: 40em; }

.divider {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: clamp(1.75rem, 4vw, 2.75rem);
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: .5rem;
  z-index: 200;
  transform: translateY(-220%);
  background: var(--gold);
  color: #20160A;
  padding: .55rem 1rem;
  font-size: 14px;
  letter-spacing: .08em;
  transition: transform .2s var(--ease);
}

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

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(16, 26, 51, .97), rgba(16, 26, 51, .9));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__brand-row {
  overflow: hidden;
  max-height: 96px;
  border-bottom: 1px solid rgba(46, 65, 102, .55);
  transition: max-height .34s var(--ease), opacity .24s var(--ease), border-color .24s var(--ease);
}

.site-header.is-condensed .site-header__brand-row {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.site-header__brand-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: .8rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  min-width: 0;
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border: 1px solid var(--gold);
  background: rgba(227, 178, 91, .09);
  color: var(--gold-soft);
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
}

.brand-mark__text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
  min-width: 0;
}

.brand-mark__name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink);
}

.brand-mark__sub {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.site-status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
  max-width: none;
  flex: 0 0 auto;
}

.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(79, 163, 165, .18);
}

.site-header__nav-row { position: relative; }

.site-header__nav-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding-block: .6rem;
}

.site-nav { flex: 1 1 auto; min-width: 0; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: .4rem 0;
  font-size: 15px;
  letter-spacing: .07em;
  color: var(--ink);
  transition: color .22s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .28s var(--ease);
}

.site-nav__link:hover { color: var(--gold-soft); }

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  flex: 0 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .5rem 1.05rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  letter-spacing: .09em;
  cursor: pointer;
  border-radius: 0;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

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

.btn--quiet { color: var(--muted); }

.btn--quiet:hover { color: var(--ink); border-color: var(--teal); }

.btn--accent {
  background: var(--gold);
  border-color: var(--gold);
  color: #20160A;
  font-weight: 600;
}

.btn--accent:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
  color: #20160A;
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .45rem .7rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .12em;
  cursor: pointer;
  flex: 0 0 auto;
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform .22s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 检索面板 ---------- */
.site-search {
  border-top: 1px solid var(--line);
  background: var(--indigo-850);
}

.site-search__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .85rem 1.5rem;
  padding-block: 1rem;
}

.site-search__field {
  flex: 1 1 280px;
  display: flex;
  align-items: center;
  gap: .7rem;
  border-bottom: 1px solid var(--line);
  padding: .3rem .1rem;
  transition: border-color .22s var(--ease);
}

.site-search__field:focus-within { border-bottom-color: var(--gold); }

.site-search__hint {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  flex: 0 0 auto;
}

.site-search__input {
  flex: 1 1 auto;
  min-width: 0;
  background: none;
  border: 0;
  outline: none;
  padding: .25rem 0;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--ink);
}

.site-search__input::placeholder { color: var(--muted); }

.site-search__status {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--teal);
  max-width: none;
}

/* ---------- 阅读进度轨 ---------- */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--teal), var(--gold) 55%, var(--coral));
  pointer-events: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 7rem);
  background: linear-gradient(180deg, var(--indigo-900), #0C142A);
  border-top: 1px solid var(--line);
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.25rem;
  padding-block: clamp(1.75rem, 4vw, 2.5rem) 0;
}

.footer-brand__name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold);
}

.footer-brand__tag {
  font-size: 13.5px;
  color: var(--muted);
  max-width: 40em;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr 1.8fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 4.5vw, 3.25rem);
  border-bottom: 1px solid var(--line);
}

.footer-col__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: 1rem;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.footer-list a,
.footer-list span {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.footer-list a {
  transition: color .2s var(--ease);
}

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

.footer-note {
  margin-top: .95rem;
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 34em;
}

.footer-version__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1.5rem;
  padding-block: 1.1rem;
}

.footer-version__main {
  display: inline-flex;
  align-items: baseline;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold);
  max-width: none;
}

.footer-version__label {
  font-family: var(--font-sans);
  letter-spacing: .14em;
  color: var(--gold-soft);
}

.footer-version__link {
  font-size: 13.5px;
  letter-spacing: .08em;
  color: var(--gold-soft);
  border-bottom: 1px solid rgba(242, 215, 154, .4);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

.footer-legal {
  border-top: 1px solid rgba(46, 65, 102, .6);
}

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1.5rem;
  padding-block: 1.15rem 1.5rem;
}

.footer-legal__meta {
  font-size: 12.5px;
  color: var(--muted);
  max-width: none;
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 12.5px;
}

.footer-legal__links a {
  color: var(--muted);
  transition: color .2s var(--ease);
}

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

/* ---------- 通用小组件 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .18rem .55rem;
  border: 1px solid rgba(227, 178, 91, .42);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  white-space: nowrap;
}

.tag--teal { color: var(--teal); border-color: rgba(79, 163, 165, .42); }
.tag--coral { color: var(--coral); border-color: rgba(232, 115, 74, .42); }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.link {
  color: var(--gold-soft);
  border-bottom: 1px solid rgba(242, 215, 154, .35);
  transition: border-color .2s var(--ease);
}

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

.panel {
  background: var(--indigo-700);
  border: 1px solid var(--line);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.panel--cut {
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  transition: clip-path .3s var(--ease);
}

.panel--cut:hover {
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  padding-top: 1.15rem;
  font-size: 13px;
  color: var(--muted);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "／";
  margin-right: .45rem;
  color: var(--line);
}

.breadcrumbs a { transition: color .2s var(--ease); }
.breadcrumbs a:hover { color: var(--gold-soft); }
.breadcrumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(150deg, var(--indigo-700) 0%, var(--indigo-850) 55%, #0F1830 100%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(245, 241, 232, .055) 1px, transparent 1px);
  background-size: 3px 3px;
  pointer-events: none;
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(.96) brightness(.94);
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--4x5  { aspect-ratio: 4 / 5; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

/* ---------- 折叠内容组 ---------- */
.accordion { border-top: 1px solid var(--line); }

.accordion__item { border-bottom: 1px solid var(--line); }

.accordion__button {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  width: 100%;
  padding: 1.15rem .25rem;
  border: 0;
  background: none;
  text-align: left;
  color: var(--ink);
  font-size: 17px;
  letter-spacing: .02em;
  cursor: pointer;
  transition: color .2s var(--ease);
}

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

.accordion__index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.accordion__mark {
  position: relative;
  flex: 0 0 auto;
  align-self: center;
  margin-left: auto;
  width: 12px;
  height: 12px;
}

.accordion__mark::before,
.accordion__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gold);
  transform: translate(-50%, -50%);
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.accordion__mark::before { width: 12px; height: 1px; }
.accordion__mark::after { width: 1px; height: 12px; }

.accordion__button[aria-expanded="true"] .accordion__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.accordion__panel {
  padding: 0 .25rem 1.35rem;
  color: var(--muted);
  font-size: 15.5px;
}

.accordion__panel > * + * { margin-top: .85rem; }

/* ---------- 显现动效 ---------- */
[data-reveal] {
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(14px);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 960px) {
  :root { --rail: 100%; }

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

  .rail {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 1rem;
  }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: min(72vh, 32rem);
    overflow-y: auto;
    padding: .35rem 1.25rem 1.1rem;
    background: var(--indigo-850);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 42px -26px rgba(0, 0, 0, .8);
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: .9rem .15rem;
    font-size: 16px;
    border-bottom: 1px solid rgba(46, 65, 102, .55);
  }

  .site-nav__link::after { display: none; }

  .site-nav__list > li:last-child .site-nav__link { border-bottom: 0; }

  .site-header__nav-inner { padding-block: .55rem; }

  .site-header__brand-inner { padding-block: .68rem; }

  .site-status { display: none; }
}

@media (max-width: 768px) {
  body { font-size: 16px; line-height: 1.85; }

  .wrap { width: min(100% - 1.75rem, var(--wrap)); }

  .site-search__status { flex: 1 1 100%; }

  .footer-legal__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .header-actions { gap: .4rem; }
  .btn { padding: .48rem .8rem; font-size: 13.5px; }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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