/* =========================================================
   皇冠体肓 · 共享样式表 /assets/site.css
   令牌 → 重置 → 排版 → 页头 → 页脚 → 通用组件 → 栅格 → 动效
   ========================================================= */

:root {
  --gold: #C9A227;
  --gold-deep: #8A6D18;
  --gold-pale: #E8D9A8;
  --forest: #0F3D2E;
  --forest-2: #2E5A4A;
  --paper: #F6F1E7;
  --paper-hi: #FFFDF8;
  --line: #D8D0C0;
  --red: #B23A2F;
  --ink: #161B18;

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

  --shell: 1240px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --radius: 2px;
  --dur: 200ms;
  --ease: cubic-bezier(.2, .6, .3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: var(--paper);
  background-image: radial-gradient(circle at 1px 1px, rgba(15, 61, 46, .07) 1px, transparent 0);
  background-size: 5px 5px;
}

body {
  margin: 0;
  min-height: 100vh;
  background: transparent;
  color: var(--forest);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; }
img { display: block; height: auto; }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; color: inherit; }
:target { scroll-margin-top: 5.5rem; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.01em;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--forest);
  text-decoration-color: var(--gold);
  text-underline-offset: .22em;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(15, 61, 46, .35);
  border-radius: var(--radius);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 布局容器 ---------- */
.shell {
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

.page-body {
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

.prose {
  max-width: 36em;
  line-height: 1.85;
}

.lead {
  max-width: 36em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--forest-2);
}

/* ---------- 页头 ---------- */
.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 200;
  padding: .6rem 1.1rem;
  background: var(--forest);
  color: var(--paper-hi);
  font-size: .85rem;
  letter-spacing: .06em;
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: .75rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(246, 241, 231, .94);
  -webkit-backdrop-filter: blur(10px) saturate(115%);
  backdrop-filter: blur(10px) saturate(115%);
  border-bottom: 1px solid var(--line);
  box-shadow: inset 0 -1px 0 rgba(201, 162, 39, .45);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  box-shadow:
    inset 0 -1px 0 rgba(201, 162, 39, .6),
    0 14px 30px -22px rgba(22, 27, 24, .65);
}

.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(22, 27, 24, .08);
  pointer-events: none;
}

.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold) 55%, var(--gold-pale));
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  flex: 0 0 auto;
  padding: .3rem .2rem .3rem 0;
  color: var(--forest);
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  width: 2.1rem;
  height: 1.7rem;
  color: var(--gold-deep);
  transition: color var(--dur) var(--ease);
}

.brand__mark svg { width: 100%; height: 100%; }
.brand:hover .brand__mark { color: var(--gold); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .06em;
}

.brand__sub {
  margin-top: .26rem;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .12em;
  color: var(--forest-2);
}

.site-nav { margin-left: .35rem; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: .1rem;
  list-style: none;
}

.site-nav__item { list-style: none; }

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: .38rem;
  padding: .4rem .62rem;
  font-size: .88rem;
  letter-spacing: .02em;
  color: var(--forest);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .02em;
  color: var(--gold-deep);
  transition: color var(--dur) var(--ease);
}

.site-nav__link[aria-current="page"] {
  background: var(--forest);
  color: var(--paper-hi);
  border-color: var(--forest);
  box-shadow: inset 0 -2px 0 var(--gold);
}

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

.header-status {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .04em;
  color: var(--forest-2);
  white-space: nowrap;
}

.header-status::before {
  content: "";
  width: .4rem;
  height: .4rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .22);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  margin-left: auto;
  padding: .5rem .7rem;
  background: var(--paper-hi);
  color: var(--forest);
  border: 1px solid var(--forest-2);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { background: var(--forest); color: var(--paper-hi); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 1rem;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  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(4px) 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(-4px) rotate(-45deg); }

.nav-toggle__text { letter-spacing: .16em; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(3.5rem, 8vw, 6rem);
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--gold);
}

.footer-ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: clamp(60px, 9vw, 112px);
  color: var(--gold);
  opacity: .12;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 4fr) minmax(0, 5fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: clamp(2.5rem, 5vw, 3.75rem) clamp(1.75rem, 4vw, 2.5rem);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.footer-brand__mark {
  display: block;
  width: 2.6rem;
  height: 2rem;
  color: var(--gold);
}

.footer-brand__mark svg { width: 100%; height: 100%; }

.footer-brand__name {
  margin: .6rem 0 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: .08em;
  color: var(--paper-hi);
}

.footer-brand__sub {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--gold-pale);
}

.footer-nav { margin: 0; }

.footer-nav__list {
  list-style: none;
  columns: 2;
  column-gap: clamp(1rem, 3vw, 2.25rem);
}

.footer-nav__item {
  break-inside: avoid;
  border-bottom: 1px solid rgba(246, 241, 231, .14);
}

.footer-nav__link {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  padding: .62rem 0;
  color: var(--paper);
  font-size: .92rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-nav__num {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .04em;
  color: var(--gold-deep);
  transition: color var(--dur) var(--ease);
}

.footer-meta { margin: 0; }

.footer-meta__list {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  list-style: none;
}

.footer-meta__row {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .9rem;
  font-size: .86rem;
  line-height: 1.7;
}

.footer-meta__key {
  flex: 0 0 4.6rem;
  padding-top: .22rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--gold-pale);
}

.footer-meta__val {
  flex: 1 1 12rem;
  min-width: 0;
  color: rgba(246, 241, 231, .82);
  overflow-wrap: anywhere;
}

.footer-base {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: 1rem 1.6rem;
  border-top: 1px solid rgba(246, 241, 231, .14);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: rgba(246, 241, 231, .62);
}

.footer-base__copy,
.footer-base__icp { margin: 0; }

/* ---------- 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .05em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

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

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

.btn--dark {
  background: var(--forest);
  color: var(--paper-hi);
  border-color: var(--forest);
}

.btn--ghost {
  background: transparent;
  color: var(--forest);
  border-color: var(--forest-2);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
}

.eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--gold);
}

.h-sec { font-size: clamp(1.45rem, 3vw, 2rem); }

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .14rem .55rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--forest);
  background: var(--gold-pale);
  border: 1px solid rgba(138, 109, 24, .35);
  border-radius: var(--radius);
}

.stamp {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .12rem .5rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .1em;
  color: var(--paper-hi);
  background: var(--red);
  border-radius: var(--radius);
}

.glass {
  background: linear-gradient(160deg, rgba(255, 253, 248, .84), rgba(232, 217, 168, .42));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 253, 248, .78);
  box-shadow: 0 1px 0 rgba(216, 208, 192, .9);
}

.solid {
  background: var(--paper-hi);
  border: 1px solid var(--line);
}

.rule {
  height: 0;
  margin-block: clamp(1.5rem, 3vw, 2.25rem);
  border: 0;
  border-top: 1px solid var(--line);
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--forest-2);
}

.crumbs a {
  color: var(--forest-2);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.crumbs__sep { color: var(--gold-deep); }
.crumbs__current { color: var(--forest); }

/* ---------- 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--paper-hi);
  border: 1px solid var(--line);
}

.media__frame {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(140deg, rgba(15, 61, 46, .09), rgba(201, 162, 39, .16));
}

.media__frame > img,
.media__frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  margin: .6rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.6;
  color: var(--forest-2);
}

.media--portrait .media__frame { aspect-ratio: 4 / 5; }
.media--wide .media__frame { aspect-ratio: 21 / 9; }

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--4-8 { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }

/* ---------- 显现 ---------- */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}

[data-js="on"] [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 悬停能力 ---------- */
@media (hover: hover) {
  .site-nav__link:hover {
    background: rgba(232, 217, 168, .6);
    border-color: var(--gold-pale);
  }

  .btn--gold:hover {
    background: var(--gold-deep);
    color: var(--paper-hi);
    border-color: var(--gold-deep);
  }

  .btn--dark:hover {
    background: var(--forest-2);
    border-color: var(--forest-2);
  }

  .btn--ghost:hover {
    background: var(--forest);
    color: var(--paper-hi);
    border-color: var(--forest);
  }

  .footer-nav__link:hover {
    color: var(--gold);
    padding-left: .35rem;
  }

  .footer-nav__link:hover .footer-nav__num { color: var(--gold); }

  .crumbs a:hover {
    color: var(--gold-deep);
    border-color: var(--gold);
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .site-nav__link { padding: .4rem .46rem; font-size: .83rem; }
  .brand__sub { font-size: .6rem; letter-spacing: .08em; }
}

@media (max-width: 900px) {
  .header-inner { min-height: 3.75rem; }
  .nav-toggle { display: inline-flex; }
  .header-status { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    margin: 0;
    padding: .5rem .9rem 1rem;
    background: var(--paper-hi);
    border: 1px solid var(--line);
    border-top: 2px solid var(--gold);
    box-shadow: 0 22px 42px -26px rgba(22, 27, 24, .6);
  }

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

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

  .site-nav__link {
    justify-content: space-between;
    padding: .8rem .3rem;
    font-size: .98rem;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .site-nav__link[aria-current="page"] {
    padding-left: .8rem;
    border-bottom-color: var(--forest);
    box-shadow: inset 3px 0 0 var(--gold);
  }

  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .grid--2,
  .grid--5-7,
  .grid--4-8 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  .brand__name { font-size: 1.02rem; }
  .brand__sub { display: none; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-nav__list { columns: 1; }
  .footer-meta__key { flex-basis: 100%; padding-top: 0; }
  .footer-base { font-size: .68rem; }
  .media__caption { font-size: .7rem; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  [data-js="on"] [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}