/* ============================================================
   问鼎游艺 · 共享站点样式 /assets/site.css
   框架式导航 + 唐卡色系 + 圆角切角并置
   ============================================================ */

:root {
  --ink: #0B1026;
  --ink-2: #11172F;
  --ink-3: #080C1E;
  --lapis: #1F4FA8;
  --lapis-bright: #3D7BFF;
  --cinnabar: #C8392B;
  --cinnabar-warm: #E85A3A;
  --gold: #D9A441;
  --gold-light: #F2D48A;
  --snow: #F5F3EA;
  --mist: #A9B0C6;
  --jade: #2FA79E;
  --green: #4FBF8B;

  --frame-w: 252px;
  --r-lg: 26px;
  --r-md: 16px;
  --r-pill: 999px;

  --line: rgba(217, 164, 65, 0.28);
  --line-soft: rgba(169, 176, 198, 0.18);
  --shadow: 0 22px 48px -30px rgba(0, 0, 0, 0.95);

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

  --ease: cubic-bezier(0.22, 0.7, 0.28, 1);
}

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

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

html.nav-locked { overflow: hidden; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 700px at 92% -12%, rgba(31, 79, 168, 0.38), transparent 62%),
    radial-gradient(820px 560px at 2% 106%, rgba(200, 57, 43, 0.2), transparent 66%);
  background-repeat: no-repeat;
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--snow);
}

p { margin: 0; }

ul, ol { margin: 0; }

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

img { height: auto; }

a { color: inherit; }

button { font-family: inherit; }

address { font-style: normal; }

:focus-visible {
  outline: 2px solid var(--gold-light);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: linear-gradient(120deg, var(--gold), var(--gold-light));
  color: #22160a;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.22s var(--ease);
}

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

/* ============================================================
   头部 · 移动优先：品牌条 + 底部升起的面板
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 12px clamp(14px, 4vw, 24px);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, #0E1430 0%, #0A0F25 100%);
  isolation: isolate;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(320px 220px at 8% 0%, rgba(217, 164, 65, 0.16), transparent 72%),
    repeating-linear-gradient(135deg, rgba(169, 176, 198, 0.055) 0 1px, transparent 1px 22px);
}

.site-header::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(5, 8, 20, 0.74);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.24s var(--ease), visibility 0.24s var(--ease);
}

.site-header[data-open="true"]::after {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.frame-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--snow);
  min-width: 0;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  border-radius: 14px 4px 14px 4px;
  background: linear-gradient(150deg, var(--lapis) 0%, var(--lapis-bright) 48%, var(--cinnabar) 100%);
  box-shadow:
    inset 0 0 0 1px rgba(242, 212, 138, 0.5),
    0 10px 22px -14px rgba(61, 123, 255, 0.95);
}

.brand-mark::after {
  content: "";
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: var(--gold-light);
  transform: rotate(45deg);
  box-shadow: 0 0 14px rgba(242, 212, 138, 0.85);
}

.brand-text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.2;
  color: var(--snow);
}

.brand-tagline {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--gold-light);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(31, 79, 168, 0.22);
  color: var(--snow);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-toggle:hover {
  background: rgba(31, 79, 168, 0.4);
  border-color: rgba(61, 123, 255, 0.55);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--gold-light);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 移动端导航面板 */
.site-nav {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 70;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: min(78vh, 640px);
  overflow-y: auto;
  padding: 20px 18px calc(20px + env(safe-area-inset-bottom, 0px));
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, #141B3B 0%, #080C1E 100%);
  box-shadow: 0 -24px 60px -26px rgba(0, 0, 0, 0.96);
  transform: translateY(calc(100% + 28px));
  opacity: 0;
  visibility: hidden;
  transition: transform 0.32s var(--ease), opacity 0.24s var(--ease), visibility 0.32s var(--ease);
}

.site-header[data-open="true"] .site-nav {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.nav-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border: 1px solid transparent;
  border-radius: 14px;
  color: var(--snow);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.nav-link:hover {
  background: rgba(31, 79, 168, 0.28);
  border-color: rgba(61, 123, 255, 0.42);
  transform: translateX(2px);
}

.nav-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--mist);
  opacity: 0.75;
}

.nav-text {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-link--featured .nav-text::after {
  content: "直达";
  display: inline-block;
  padding: 1px 7px;
  border: 1px solid rgba(217, 164, 65, 0.6);
  border-radius: var(--r-pill);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  background: rgba(217, 164, 65, 0.12);
}

.nav-link--featured {
  border-color: rgba(217, 164, 65, 0.24);
  background: rgba(31, 79, 168, 0.16);
}

.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(217, 164, 65, 0.24), rgba(31, 79, 168, 0.2));
  border-color: rgba(217, 164, 65, 0.5);
  color: var(--gold-light);
  box-shadow: inset 0 0 0 1px rgba(242, 212, 138, 0.14);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--gold-light);
  opacity: 1;
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: 9px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold-light), var(--cinnabar-warm));
}

.nav-aside {
  display: grid;
  gap: 10px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.nav-utility {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  background: linear-gradient(120deg, var(--cinnabar), var(--cinnabar-warm));
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  box-shadow: 0 12px 26px -18px rgba(232, 90, 58, 0.95);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.nav-utility:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px -18px rgba(232, 90, 58, 1);
}

.nav-mail {
  display: grid;
  gap: 2px;
  margin: 0;
  font-size: 11px;
  line-height: 1.5;
  word-break: break-all;
}

.nav-mail-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(169, 176, 198, 0.78);
}

.nav-mail-value {
  color: var(--gold-light);
}

/* 平板：导航面板两列 */
@media (min-width: 640px) and (max-width: 999px) {
  .nav-list { grid-template-columns: 1fr 1fr; }
  .site-nav { left: 24px; right: 24px; bottom: 24px; }
}

/* ============================================================
   头部 · 桌面框架栏
   ============================================================ */
@media (min-width: 1000px) {
  body {
    padding-left: var(--frame-w);
  }

  .skip-link {
    left: calc(var(--frame-w) + 14px);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--frame-w);
    flex-wrap: nowrap;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 26px 20px 20px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    background: linear-gradient(180deg, #0D1330 0%, #0A0F24 58%, var(--ink-3) 100%);
    overflow-y: auto;
    overflow-x: hidden;
  }

  .site-header::before {
    background-image:
      radial-gradient(340px 240px at 10% 0%, rgba(217, 164, 65, 0.2), transparent 70%),
      radial-gradient(300px 320px at 108% 88%, rgba(200, 57, 43, 0.22), transparent 72%),
      repeating-linear-gradient(135deg, rgba(169, 176, 198, 0.05) 0 1px, transparent 1px 24px);
  }

  .frame-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .brand-name { font-size: 21px; }
  .brand-tagline { font-size: 10px; }
  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    left: auto;
    right: auto;
    bottom: auto;
    z-index: auto;
    flex: 1;
    width: auto;
    max-height: none;
    overflow: visible;
    margin-top: 24px;
    padding: 18px 0 0;
    border: 0;
    border-top: 1px solid var(--line-soft);
    border-radius: 0;
    background: none;
    box-shadow: none;
    transform: none;
    opacity: 1;
    visibility: visible;
    transition: none;
  }

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

  .nav-link {
    padding: 10px 12px;
    font-size: 13.5px;
  }

  .nav-link:hover { transform: translateX(3px); }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding: clamp(34px, 5vw, 62px) clamp(16px, 4vw, 48px) 26px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 23, 47, 0.94) 0%, var(--ink-3) 100%);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -150px;
  left: 50%;
  width: min(1200px, 140vw);
  height: 300px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(217, 164, 65, 0.22), transparent 74%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(135deg, rgba(169, 176, 198, 0.045) 0 1px, transparent 1px 26px);
  opacity: 0.8;
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 3.4vw, 36px);
  max-width: 1120px;
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand-text {
  display: grid;
  gap: 6px;
  max-width: 46ch;
}

.footer-brand-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.footer-tagline {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--gold-light);
}

.footer-note {
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-grid {
  display: grid;
  gap: 26px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) 1.25fr; }
}

.footer-col {
  min-width: 0;
}

.footer-col-title {
  display: flex;
  align-items: center;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.footer-col-title::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 9px;
  border-radius: 1px;
  background: var(--gold);
  transform: rotate(45deg);
}

.footer-links {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  padding: 6px 0;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--gold-light);
  border-bottom-color: rgba(242, 212, 138, 0.55);
}

.footer-contact {
  display: grid;
  gap: 12px;
  margin: 0;
}

.footer-contact-item {
  display: grid;
  gap: 1px;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(169, 176, 198, 0.72);
}

.footer-contact-value {
  color: var(--snow);
  font-size: 13.5px;
  line-height: 1.6;
  word-break: break-word;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  color: var(--mist);
}

.footer-legal {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: rgba(242, 212, 138, 0.8);
}

.footer-copyright {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ============================================================
   通用布局与排版
   ============================================================ */
.page-wrap {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(24px, 4vw, 54px) clamp(16px, 4vw, 48px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.section-lead {
  max-width: 60ch;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(245, 243, 234, 0.9);
}

.prose h2 {
  margin: 2em 0 0.6em;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  letter-spacing: -0.01em;
}

.prose h3 {
  margin: 1.7em 0 0.5em;
  font-size: 1.2rem;
  color: var(--gold-light);
}

.prose p { margin: 0 0 1.05em; }

.prose a {
  color: var(--lapis-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.25em;
}

.prose li { margin-bottom: 0.45em; }

.prose strong { color: var(--gold-light); }

.prose blockquote {
  margin: 1.6em 0;
  padding: 16px 22px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(31, 79, 168, 0.16);
  color: var(--snow);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--split { grid-template-columns: 1fr; }

@media (min-width: 900px) {
  .grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

.grid--cards {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(23, 31, 60, 0.94) 0%, rgba(13, 18, 40, 0.96) 100%);
  box-shadow: var(--shadow);
}

.card--cut {
  border-radius: var(--r-lg) 6px var(--r-lg) 6px;
}

.card-title {
  margin: 0 0 0.5em;
  font-size: 1.2rem;
  color: var(--snow);
}

.card-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.btn--gold {
  background: linear-gradient(120deg, var(--gold), var(--gold-light));
  color: #231705;
  box-shadow: 0 14px 30px -20px rgba(217, 164, 65, 0.95);
}

.btn--cinnabar {
  background: linear-gradient(120deg, var(--cinnabar), var(--cinnabar-warm));
  color: #fff;
  box-shadow: 0 14px 30px -20px rgba(232, 90, 58, 0.95);
}

.btn--ghost {
  border-color: var(--line);
  background: rgba(31, 79, 168, 0.16);
  color: var(--snow);
}

.btn--sm {
  padding: 9px 16px;
  font-size: 13px;
}

.btn:hover {
  transform: translateY(-2px);
}

/* ---------- 标签与分段 ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  background: rgba(31, 79, 168, 0.18);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.pill--gold {
  border-color: rgba(217, 164, 65, 0.5);
  background: rgba(217, 164, 65, 0.14);
  color: var(--gold-light);
}

.pill--cinnabar {
  border-color: rgba(232, 90, 58, 0.5);
  background: rgba(200, 57, 43, 0.2);
  color: #FFBDAE;
}

.segment {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  background: rgba(8, 12, 30, 0.72);
}

.segment-btn {
  padding: 8px 16px;
  border: 0;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--mist);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.segment-btn:hover {
  color: var(--snow);
  background: rgba(31, 79, 168, 0.28);
}

.segment-btn[aria-selected="true"] {
  background: linear-gradient(120deg, var(--lapis), var(--lapis-bright));
  color: #fff;
  box-shadow: 0 10px 22px -16px rgba(61, 123, 255, 1);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(169, 176, 198, 0.42);
}

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

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

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

/* ---------- 折叠面板 ---------- */
.accordion {
  display: grid;
  gap: 10px;
}

.accordion-item {
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: rgba(17, 23, 47, 0.72);
  overflow: hidden;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 15px 18px;
  border: 0;
  background: none;
  color: var(--snow);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.accordion-trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--gold-light);
}

.accordion-trigger[aria-expanded="true"]::after {
  content: "–";
}

.accordion-panel {
  padding: 0 18px 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.accordion-panel[hidden] { display: none; }

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: 0;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(61, 123, 255, 0.45), transparent 60%),
    linear-gradient(150deg, rgba(31, 79, 168, 0.5) 0%, rgba(200, 57, 43, 0.32) 52%, rgba(11, 16, 38, 0.94) 100%);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(45deg, rgba(245, 243, 234, 0.07) 0 1px, transparent 1px 20px),
    radial-gradient(60% 60% at 50% 50%, transparent 46%, rgba(8, 12, 30, 0.5) 100%);
}

.media-frame img {
  position: relative;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame figcaption {
  position: absolute;
  inset: auto 0 0;
  z-index: 2;
  padding: 14px 18px;
  background: linear-gradient(transparent, rgba(6, 9, 22, 0.92));
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: 3px;
  pointer-events: none;
  background: rgba(8, 12, 30, 0.5);
}

.scroll-progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold), var(--cinnabar-warm) 48%, var(--lapis-bright));
  transition: width 0.1s linear;
}

@media (min-width: 1000px) {
  .scroll-progress { left: var(--frame-w); }
}

/* ---------- 动效偏好 ---------- */
@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;
  }

  .scroll-progress-bar { transition: none; }
}