/* ===== 重置 / 令牌 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --crimson: #A6192E;
  --crimson-deep: #7A0C1E;
  --gold: #D4AF37;
  --gold-light: #E6C87C;
  --gold-brown: #B89354;
  --ink: #1A1A1A;
  --ivory: #FFFFF0;
  --paper: #F5EFE0;
  --serif: "Songti SC", "SimSun", "STSong", serif;
  --sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --header-w: 288px;
  --ease: cubic-bezier(.25, .1, .25, 1);
  --dur: 240ms;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background:
    radial-gradient(ellipse at 88% 4%, rgba(212, 175, 55, .12), transparent 52%),
    var(--ivory);
  padding-left: var(--header-w);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 .5em;
}

h1 { font-size: 36px; }
h2 { font-size: 30px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }

p {
  margin: 0 0 1em;
}

ul, ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
}

a {
  color: var(--crimson);
  transition: color var(--dur) var(--ease);
}

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

img {
  max-width: 100%;
  height: auto;
}

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

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
  border-radius: 2px;
  box-shadow: 0 0 0 4px rgba(26, 26, 26, .18);
}

::selection {
  background: var(--crimson);
  color: var(--ivory);
}

blockquote {
  margin: 0 0 1em;
  padding: 12px 16px;
  border-left: 4px solid var(--gold-brown);
  background: var(--paper);
  font-family: var(--serif);
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .92em;
  background: var(--paper);
  padding: 2px 5px;
  border-radius: 2px;
}

hr {
  border: none;
  border-top: 1px solid rgba(184, 147, 84, .35);
  margin: 32px 0;
}

[hidden] {
  display: none !important;
}

/* ===== 主内容 / 跳转 ===== */
#main-content {
  scroll-margin-top: 96px;
}

#main-content:focus,
#main-content:focus-visible {
  outline: none;
  box-shadow: none;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 500;
  display: inline-block;
  padding: 12px 18px;
  font: 600 14px/1.4 var(--sans);
  color: var(--ivory);
  background: var(--ink);
  border: 1px solid var(--gold);
  border-radius: 2px;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus-visible {
  top: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .35);
}

/* ===== 滚动进度 / 返回顶部 ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--header-w);
  right: 0;
  height: 3px;
  z-index: 260;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--crimson), var(--gold), var(--gold-light));
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 130;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--gold);
  border-radius: 2px;
  background: var(--crimson);
  color: var(--ivory);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top:hover {
  background: var(--crimson-deep);
  border-color: var(--gold-light);
}

/* ===== 头部 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  width: var(--header-w);
  height: 100vh;
  height: 100dvh;
  padding: 28px 22px 18px;
  color: var(--ivory);
  background:
    repeating-linear-gradient(120deg, rgba(212, 175, 55, .055) 0 2px, transparent 2px 17px),
    linear-gradient(165deg, var(--crimson) 0%, var(--crimson-deep) 76%);
  border-right: 1px solid var(--gold);
  box-shadow: 2px 0 16px rgba(26, 26, 26, .18);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-light) rgba(26, 26, 26, .25);
}

.site-header > * {
  min-width: 0;
}

.header-topbar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(212, 175, 55, .22);
}

.brand-anchor {
  display: inline-flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: var(--ivory);
}

.brand-title {
  font: 700 30px/1.25 var(--serif);
  color: var(--ivory);
  letter-spacing: .04em;
}

.brand-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 7px;
  background: linear-gradient(90deg, var(--gold), rgba(212, 175, 55, 0));
  transition: width var(--dur) var(--ease);
}

.brand-anchor:hover .brand-title::after {
  width: 88px;
}

.brand-subline {
  font-size: 12px;
  letter-spacing: .07em;
  line-height: 1.5;
  color: rgba(230, 200, 124, .86);
}

.header-utils {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(212, 175, 55, .4);
  border-radius: 2px;
  background: rgba(212, 175, 55, .08);
  color: var(--ivory);
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.icon-btn:hover {
  background: rgba(212, 175, 55, .2);
  border-color: var(--gold-light);
  color: var(--gold-light);
}

.icon-btn svg {
  display: block;
}

.search-btn {
  color: var(--gold-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 10px 20px;
  font: 600 14px/1.4 var(--sans);
  border: 1px solid transparent;
  border-radius: 2px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:active {
  transform: scale(.97);
}

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

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

.btn-compact {
  min-height: 36px;
  padding: 8px 14px;
  font-size: 13px;
}

.btn-crimson {
  background: var(--crimson);
  border-color: var(--crimson);
  color: var(--ivory);
}

.btn-crimson:hover {
  background: var(--crimson-deep);
  border-color: var(--crimson-deep);
  color: var(--ivory);
}

.btn-outline {
  background: transparent;
  border-color: var(--gold-brown);
  color: var(--crimson);
}

.btn-outline:hover {
  background: rgba(212, 175, 55, .12);
  border-color: var(--gold);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(212, 175, 55, .45);
  border-radius: 2px;
  background: rgba(26, 26, 26, .2);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--gold-light);
  background: rgba(26, 26, 26, .35);
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 20px;
  height: 14px;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--ivory);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.header-metabar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 18px 0 10px;
}

.meta-chip {
  display: inline-block;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--gold-light);
  background: rgba(26, 26, 26, .18);
  border: 1px solid rgba(212, 175, 55, .3);
  border-radius: 2px;
}

.site-nav {
  flex: 1;
  display: flex;
  align-items: center;
  min-height: 0;
  margin: 4px 0 16px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-light) rgba(26, 26, 26, .2);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: 0;
  margin: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: .02em;
  color: rgba(255, 255, 240, .82);
  text-decoration: none;
  border-left: 3px solid transparent;
  border-radius: 2px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: rgba(212, 175, 55, .4);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--ivory);
  background: rgba(212, 175, 55, .14);
}

.nav-link:hover::before {
  background: var(--gold-light);
}

.nav-link[aria-current="page"] {
  color: var(--gold-light);
  background: rgba(212, 175, 55, .16);
  border-left-color: var(--gold);
}

.nav-link[aria-current="page"]::before {
  background: var(--gold);
  transform: rotate(45deg) scale(1.2);
}

.header-orbit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  padding: 14px 0 4px;
  border-top: 1px solid rgba(212, 175, 55, .24);
}

.orbit-line {
  display: block;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.orbit-label {
  font: 600 11px/1.5 var(--serif);
  letter-spacing: .18em;
  color: rgba(230, 200, 124, .85);
  text-align: center;
}

@media (max-height: 640px) {
  .header-orbit {
    display: none;
  }
}

/* ===== 移动端头部 ===== */
@media (max-width: 960px) {
  body {
    padding-left: 0;
  }

  .scroll-progress {
    left: 0;
  }

  .site-header {
    position: sticky;
    width: 100%;
    height: auto;
    min-height: 0;
    padding: 12px 16px 8px;
    border-right: none;
    border-bottom: 1px solid var(--gold);
    box-shadow: 0 2px 10px rgba(26, 26, 26, .18);
    overflow: visible;
  }

  .header-topbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-bottom: 0;
    border-bottom: none;
  }

  .brand-title {
    font-size: 22px;
    line-height: 1.2;
  }

  .brand-title::after {
    display: none;
  }

  .brand-subline {
    font-size: 10px;
    letter-spacing: .04em;
  }

  .header-utils {
    flex-shrink: 0;
  }

  .header-metabar {
    margin: 10px 0 0;
    gap: 4px;
  }

  .site-nav {
    flex: 0 1 auto;
    display: block;
    max-height: 0;
    overflow: hidden;
    margin: 0;
    transition: max-height 300ms var(--ease);
  }

  .site-nav[data-open] {
    max-height: 480px;
  }

  .nav-list {
    gap: 0;
  }

  .nav-link {
    padding: 11px 14px;
    border-left: none;
  }

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

@media (max-width: 640px) {
  .header-utils .btn-compact {
    display: none;
  }
}

/* ===== 页脚 ===== */
.site-footer {
  color: rgba(255, 255, 240, .78);
  background:
    repeating-linear-gradient(120deg, rgba(212, 175, 55, .04) 0 2px, transparent 2px 16px),
    linear-gradient(180deg, var(--ink) 0%, #111 100%);
  border-top: 1px solid var(--gold);
  padding: 48px 0 0;
}

.footer-shell {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 32px;
}

.footer-brand {
  max-width: 420px;
}

.footer-brand-anchor {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  text-decoration: none;
}

.footer-brand-name {
  font: 700 30px/1.3 var(--serif);
  color: var(--ivory);
  letter-spacing: .05em;
}

.footer-brand-name::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 8px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.footer-brand-name-sub {
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--gold-light);
}

.footer-trust {
  margin: 18px 0 4px;
  font: 600 15px/1.7 var(--serif);
  color: rgba(255, 255, 240, .9);
  max-width: 360px;
}

.footer-trust-sub {
  font-size: 14px;
  color: rgba(230, 200, 124, .8);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 36px;
  padding: 36px 0;
  border-top: 1px solid rgba(212, 175, 55, .22);
  border-bottom: 1px solid rgba(212, 175, 55, .22);
}

.footer-heading {
  margin: 0 0 14px;
  font: 700 16px/1.4 var(--serif);
  letter-spacing: .04em;
  color: var(--gold-light);
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.footer-list a {
  font-size: 14px;
  color: rgba(255, 255, 240, .72);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--gold-light);
  padding-left: 4px;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.6;
}

.contact-line {
  color: rgba(255, 255, 240, .74);
}

.contact-label {
  display: inline-block;
  min-width: 2.8em;
  margin-right: 2px;
  font-size: 13px;
  color: var(--gold);
}

.contact-emergency {
  font-size: 13px;
  color: rgba(230, 200, 124, .72);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  padding: 22px 0 26px;
  font-size: 13px;
  color: rgba(255, 255, 240, .58);
}

.footer-copy,
.footer-icp,
.footer-nav-links {
  margin: 0;
}

.footer-nav-links {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-nav-links a {
  color: rgba(230, 200, 124, .82);
  text-decoration: none;
}

.footer-nav-links a:hover {
  color: var(--gold-light);
  text-decoration: underline;
}

.footer-nav-links span {
  color: rgba(212, 175, 55, .4);
}

@media (min-width: 641px) and (max-width: 900px) {
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .footer-shell {
    padding: 0 20px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

/* ===== 共享布局 ===== */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 48px 32px 64px;
}

.container-narrow {
  max-width: 780px;
}

.section {
  padding: 56px 0;
}

.section-tight {
  padding: 28px 0;
}

.section-head {
  margin-bottom: 28px;
}

.section-kicker {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--gold-brown);
  margin-bottom: 4px;
}

.section-title {
  font-size: 30px;
  line-height: 1.3;
  margin: 0 0 6px;
}

.section-desc {
  max-width: 720px;
  color: #555;
  font-size: 15px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ===== 面板 / 卡片 ===== */
.panel {
  background: var(--ivory);
  border: 1px solid rgba(184, 147, 84, .4);
  border-radius: 4px;
  padding: 24px;
}

.panel-cut {
  background: var(--ivory);
  border: 1px solid rgba(184, 147, 84, .45);
  padding: 24px;
  clip-path: polygon(0 12px, 12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.cut-panel {
  background: var(--paper);
  border: 1px solid rgba(184, 147, 84, .4);
  padding: 22px 24px;
  clip-path: polygon(0 10px, 10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.panel-dark {
  background: var(--crimson-deep);
  border-color: rgba(212, 175, 55, .4);
  color: var(--ivory);
}

.rule-card {
  position: relative;
  background: var(--ivory);
  border: 1px solid rgba(184, 147, 84, .42);
  border-left: 4px solid var(--crimson);
  border-radius: 2px 6px 6px 2px;
  padding: 20px 20px 16px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.rule-card:hover {
  border-color: var(--gold);
}

.rule-card[data-expanded] {
  border-color: var(--gold);
  box-shadow: 0 6px 18px rgba(26, 26, 26, .08);
}

.rule-card-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  padding: 6px 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--crimson);
  cursor: pointer;
}

.rule-card-toggle::after {
  content: "＋";
  font-size: 15px;
  color: var(--gold-brown);
  transition: transform var(--dur) var(--ease);
}

.rule-card[data-expanded] .rule-card-toggle::after {
  transform: rotate(45deg);
}

.rule-card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms var(--ease);
}

.rule-card[data-expanded] .rule-card-body {
  max-height: 960px;
}

/* ===== 标签 / 面包屑 / 分隔线 ===== */
.tag {
  display: inline-block;
  vertical-align: middle;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  border-radius: 2px;
  white-space: nowrap;
}

.tag-gold {
  color: #7A5B20;
  background: rgba(212, 175, 55, .18);
  border: 1px solid rgba(212, 175, 55, .45);
}

.tag-crimson {
  color: var(--crimson);
  background: rgba(166, 25, 46, .08);
  border: 1px solid rgba(166, 25, 46, .32);
}

.tag-ink {
  color: var(--ivory);
  background: var(--ink);
  border: 1px solid var(--ink);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: center;
  margin-bottom: 24px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--gold-brown);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb li + li::before {
  content: "/";
  color: rgba(184, 147, 84, .6);
}

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

.breadcrumb a:hover {
  color: var(--gold-brown);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--gold-brown);
  font-weight: 600;
}

.divider-gold {
  display: block;
  width: 72px;
  height: 3px;
  margin: 22px 0;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.label-vertical {
  writing-mode: vertical-rl;
  font: 600 12px/1.7 var(--serif);
  letter-spacing: .22em;
  color: var(--gold-brown);
  text-transform: uppercase;
}

/* ===== 公告 / 表格 ===== */
.notice-bar {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.6;
  background: rgba(212, 175, 55, .12);
  border-left: 4px solid var(--gold-brown);
  border-radius: 2px;
}

.notice-bar::before {
  content: "◆";
  color: var(--gold-brown);
  font-size: 11px;
  margin-top: 3px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 20px 0;
  background: var(--ivory);
  border: 1px solid rgba(184, 147, 84, .38);
  border-radius: 4px;
}

.table-wrap table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 14px;
}

.table-wrap th {
  padding: 12px 14px;
  font: 700 14px/1.4 var(--serif);
  text-align: left;
  color: var(--ivory);
  background: var(--crimson);
  border-right: 1px solid rgba(255, 255, 240, .14);
}

.table-wrap th:last-child {
  border-right: none;
}

.table-wrap td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(184, 147, 84, .24);
  color: var(--ink);
  background: var(--ivory);
}

.table-wrap tr:last-child td {
  border-bottom: none;
}

.table-wrap tr:nth-child(even) td {
  background: var(--paper);
}

/* ===== 图片容器 ===== */
.image-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  overflow: hidden;
  background-color: var(--paper);
  background-image:
    linear-gradient(135deg, rgba(184, 147, 84, .1) 25%, transparent 25%),
    linear-gradient(315deg, rgba(184, 147, 84, .1) 25%, transparent 25%);
  background-size: 16px 16px;
  background-position: 0 0, 8px 8px;
  color: var(--gold-brown);
  border: 1px solid rgba(184, 147, 84, .42);
}

.image-shell img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.figure-frame {
  margin: 0;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid rgba(184, 147, 84, .45);
}

.figure-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.figure-frame figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--gold-brown);
  background: var(--ivory);
}

/* ===== 滚动显现 / 筛选 ===== */
[data-scroll-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}

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

[data-filter] {
  cursor: pointer;
}

[data-filter][aria-pressed="true"] {
  background: var(--crimson);
  border-color: var(--crimson);
  color: var(--ivory);
}

/* ===== 动效偏好 ===== */
@keyframes gold-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(212, 175, 55, .5);
  }

  100% {
    box-shadow: 0 0 0 12px rgba(212, 175, 55, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
  }

  [data-scroll-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}

@media (min-width: 961px) {
  #main-content {
    scroll-margin-top: 24px;
  }
}