/* ============================================================
   9十年信誉备用 · 共享外壳样式 /assets/site.css
   数字档案室 × 运维控制台：墨夜蓝画布 + 铜金索引 + 信号橙状态
   ============================================================ */

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

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body { margin: 0; }

h1, h2, h3, h4, p, figure, blockquote, ul, ol, dl, dd, address { margin: 0; }
ul, ol { padding: 0; list-style: none; }
address { font-style: normal; }
img, svg, video { display: block; max-width: 100%; height: auto; }

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

a { color: inherit; }

/* ---------- tokens ---------- */
:root {
  --ink-950: #061425;
  --ink-900: #0B2239;
  --ink-700: #173E5C;
  --copper-500: #B9864B;
  --copper-300: #E3B980;
  --orange-500: #FF7A3D;
  --steel-300: #B9C7D3;
  --mist-100: #E8EEF3;
  --paper-050: #F5F8FB;
  --teal-400: #4FB3A5;

  --line-soft: rgba(185, 199, 211, .16);
  --line-copper: rgba(185, 134, 75, .38);
  --line-copper-strong: rgba(227, 185, 128, .62);

  --shell: 1260px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --nav-gap: clamp(.85rem, 1.8vw, 1.9rem);

  --font-display: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  --sp-1: .5rem;
  --sp-2: .75rem;
  --sp-3: 1rem;
  --sp-4: 1.5rem;
  --sp-5: 2rem;
  --sp-6: 3rem;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-pill: 999px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .28s;

  --shadow-panel: 0 24px 60px -30px rgba(2, 10, 20, .9);
}

/* ---------- base ---------- */
body {
  background-color: var(--ink-950);
  color: var(--mist-100);
  font-family: var(--font-body);
  font-size: clamp(1rem, .96rem + .18vw, 1.0625rem);
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.02em;
  text-wrap: balance;
}

:focus-visible {
  outline: 2px solid var(--copper-300);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

#main-content { scroll-margin-top: 2rem; }

/* ---------- layout helpers ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.content {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack > * + * { margin-top: var(--sp-4); }

.grid { display: grid; gap: clamp(1.25rem, 3vw, 2rem); }
.grid--split { grid-template-columns: 1fr; align-items: start; }
.grid--duo { grid-template-columns: 1fr; }

@media (min-width: 760px) {
  .grid--duo { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 200;
  padding: .7rem 1.15rem;
  background: var(--copper-500);
  color: var(--ink-950);
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: relative;
  z-index: 80;
  background: var(--ink-950);
  isolation: isolate;
}

/* --- 上层：品牌声明 + 骨架说明 + 辅助导航 --- */
.header-meta {
  background-color: var(--ink-900);
  background-image:
    linear-gradient(90deg, rgba(185, 134, 75, .16), transparent 46%),
    linear-gradient(rgba(185, 199, 211, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 199, 211, .05) 1px, transparent 1px);
  background-size: auto, 56px 56px, 56px 56px;
  border-bottom: 1px solid var(--line-copper);
  color: var(--steel-300);
}

.header-meta__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem 1.4rem;
  min-height: 2.7rem;
  padding-block: .5rem;
}

.header-brandline {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .11em;
  color: var(--copper-300);
  white-space: nowrap;
}

.header-brandline__mark {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange-500);
  box-shadow: 0 0 0 3px rgba(255, 122, 61, .18);
}

.header-support {
  flex: 1 1 16rem;
  min-width: 0;
  padding-left: 1.4rem;
  border-left: 1px solid var(--line-soft);
  font-size: .8rem;
  line-height: 1.55;
  color: rgba(185, 199, 211, .78);
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  margin-left: auto;
}

.utility-nav__link {
  padding-block: .2rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--steel-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.utility-nav__link:hover {
  color: var(--paper-050);
  border-bottom-color: var(--copper-500);
}

@media (max-width: 860px) {
  .header-support { display: none; }
  .header-meta__inner { min-height: 2.5rem; }
}

/* --- 下层：宽幅索引条 --- */
.header-index {
  position: relative;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(180deg, rgba(23, 62, 92, .62), rgba(6, 20, 37, .96)),
    linear-gradient(90deg, rgba(185, 134, 75, .1), transparent 60%);
  border-bottom: 1px solid var(--line-soft);
}

.header-index::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--copper-500) 18%, var(--copper-300) 50%, transparent 78%);
  opacity: .5;
  pointer-events: none;
}

.header-index__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.3rem;
  padding-block: .55rem;
}

.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  color: var(--paper-050);
  text-decoration: none;
}

.brand__glyph {
  display: grid;
  place-items: center;
  width: 2.55rem;
  height: 2.55rem;
  border: 1px solid var(--line-copper-strong);
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, rgba(185, 134, 75, .3), rgba(6, 20, 37, .55));
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--copper-300);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.brand:hover .brand__glyph {
  background: var(--copper-500);
  border-color: var(--copper-500);
  color: var(--ink-950);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: .05rem;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: .01em;
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--copper-500);
}

/* --- 移动按钮 --- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .58rem .85rem;
  border: 1px solid var(--line-copper);
  border-radius: var(--radius-sm);
  background: rgba(11, 34, 57, .6);
  color: var(--copper-300);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { background: rgba(185, 134, 75, .2); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-header[data-open] .nav-toggle__bars span:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

.site-header[data-open] .nav-toggle {
  color: var(--orange-500);
  border-color: rgba(255, 122, 61, .5);
  background: rgba(255, 122, 61, .12);
}

.nav-toggle__label { white-space: nowrap; }

/* --- 主导航基础（移动优先） --- */
.primary-nav {
  display: none;
  width: 100%;
}

.primary-nav__list {
  display: flex;
  flex-direction: column;
}

.primary-nav__item { position: relative; }

.primary-nav__link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .55rem .1rem;
  color: var(--steel-300);
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.primary-nav__num {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .08em;
  color: var(--copper-500);
  transition: color var(--dur) var(--ease);
}

.primary-nav__label { white-space: nowrap; }

.primary-nav__link:hover {
  color: var(--paper-050);
  border-bottom-color: var(--copper-300);
}

.primary-nav__link:hover .primary-nav__num { color: var(--copper-300); }

.primary-nav__link[aria-current="page"] {
  color: var(--paper-050);
  border-bottom-color: var(--copper-500);
}

.primary-nav__link[aria-current="page"] .primary-nav__num { color: var(--orange-500); }

/* --- 移动端展开面板 --- */
@media (max-width: 900px) {
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    padding: .5rem var(--gutter) 1.6rem;
    background-color: var(--ink-900);
    background-image: linear-gradient(180deg, var(--ink-900), var(--ink-950));
    border-top: 1px solid var(--line-copper);
    box-shadow: 0 32px 64px rgba(2, 8, 16, .72);
    max-height: calc(100dvh - 6rem);
    overflow-y: auto;
  }

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

  .primary-nav__item { border-bottom: 1px solid var(--line-soft); }

  .primary-nav__link {
    padding: .95rem .2rem;
    font-size: 1.02rem;
    border-bottom: 0;
  }

  .primary-nav__link[aria-current="page"] { color: var(--copper-300); }
  .primary-nav__link[aria-current="page"] .primary-nav__num { color: var(--orange-500); }
}

/* --- 桌面端横排索引 --- */
@media (min-width: 901px) {
  .nav-toggle { display: none; }

  .primary-nav {
    display: block;
    width: auto;
    margin-left: auto;
  }

  .primary-nav__list {
    flex-direction: row;
    align-items: center;
    gap: var(--nav-gap);
  }

  .primary-nav__item + .primary-nav__item::before {
    content: "";
    position: absolute;
    left: calc(var(--nav-gap) / -2);
    top: 50%;
    width: 1px;
    height: 1.15em;
    transform: translateY(-50%);
    background: var(--line-soft);
  }

  .primary-nav__link { padding: .6rem .1rem; }
}

/* --- 右侧固定联系轨道 --- */
.contact-rail {
  position: fixed;
  right: 0;
  top: 50%;
  z-index: 85;
  transform: translateY(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: .7rem;
  padding: .95rem .55rem;
  text-decoration: none;
  color: var(--copper-300);
  background: rgba(11, 34, 57, .84);
  border: 1px solid var(--line-copper);
  border-right: 0;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  box-shadow: -10px 0 34px -14px rgba(2, 8, 16, .95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease), opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.contact-rail:hover {
  background: var(--copper-500);
  color: var(--ink-950);
  transform: translateY(-50%) translateX(-3px);
}

.contact-rail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange-500);
  animation: railPulse 2.8s var(--ease) infinite;
}

.contact-rail__label {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .2em;
}

.contact-rail__micro {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .1em;
  color: rgba(185, 199, 211, .7);
}

.contact-rail:hover .contact-rail__micro { color: rgba(6, 20, 37, .75); }

.site-header[data-open] .contact-rail {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

@keyframes railPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 122, 61, .55); }
  50% { box-shadow: 0 0 0 7px rgba(255, 122, 61, 0); }
}

@media (max-width: 720px) {
  .contact-rail {
    top: auto;
    bottom: 1.25rem;
    right: .9rem;
    transform: none;
    flex-direction: row;
    gap: .5rem;
    padding: .6rem .95rem;
    border-right: 1px solid var(--line-copper);
    border-radius: var(--radius-pill);
    font-size: .8rem;
    box-shadow: 0 16px 32px -14px rgba(2, 8, 16, .95);
  }

  .contact-rail:hover { transform: none; }

  .contact-rail__label {
    writing-mode: horizontal-tb;
    font-size: .8rem;
    letter-spacing: .08em;
  }

  .contact-rail__micro { display: none; }
}

/* --- 滚动进度 --- */
.scroll-gauge {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  height: 2px;
  background: rgba(185, 199, 211, .1);
  pointer-events: none;
}

.scroll-gauge__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--copper-500), var(--orange-500));
  transition: width .1s linear;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-block: clamp(2.75rem, 6vw, 4.5rem) 1.75rem;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(rgba(185, 199, 211, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 199, 211, .045) 1px, transparent 1px),
    radial-gradient(120% 80% at 12% 0%, rgba(23, 62, 92, .55), transparent 60%);
  background-size: 72px 72px, 72px 72px, auto;
  border-top: 1px solid var(--line-copper);
  color: var(--steel-300);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3rem);
}

@media (min-width: 720px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .footer-brand { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.7fr .9fr 1.2fr;
  }

  .footer-brand { grid-column: auto; }
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper-050);
  margin-bottom: .7rem;
}

.footer-brand__desc {
  max-width: 34ch;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(185, 199, 211, .86);
}

.footer-brand__stamp {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1.15rem;
  padding: .32rem .72rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .67rem;
  letter-spacing: .12em;
  color: var(--teal-400);
}

.status-dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(79, 179, 165, .16);
}

.footer-col__title {
  padding-bottom: .6rem;
  margin-bottom: .95rem;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .69rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--copper-500);
}

.footer-nav__list {
  display: grid;
  gap: .6rem;
}

.footer-nav__link {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .9rem;
  color: var(--steel-300);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.footer-nav__link::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 1px;
  background: var(--copper-500);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-nav__link:hover { color: var(--paper-050); }
.footer-nav__link:hover::before { width: 24px; background: var(--orange-500); }

.footer-contact__list {
  display: grid;
  gap: .95rem;
}

.footer-contact__item {
  display: grid;
  gap: .15rem;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .14em;
  color: rgba(185, 199, 211, .6);
}

.footer-address {
  font-size: .9rem;
  line-height: 1.7;
  color: rgba(232, 238, 243, .9);
}

.copy-chip {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding-block: .1rem;
  max-width: 100%;
  font-size: .92rem;
  text-align: left;
  word-break: break-all;
  color: var(--paper-050);
  border-bottom: 1px dashed var(--line-copper);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.copy-chip::after {
  content: "复制";
  flex: 0 0 auto;
  padding: 0 .3rem;
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .1em;
  color: var(--copper-500);
  border: 1px solid var(--line-copper);
  border-radius: 2px;
}

.copy-chip:hover {
  color: var(--copper-300);
  border-bottom-color: var(--copper-300);
}

.copy-chip[data-copied]::after {
  content: "已复制";
  color: var(--teal-400);
  border-color: rgba(79, 179, 165, .5);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .06em;
  color: rgba(185, 199, 211, .62);
}

.footer-bottom__icp { color: rgba(185, 199, 211, .8); }
.footer-bottom__copy { margin-left: auto; }

/* --- 返回顶部 --- */
.to-top {
  position: fixed;
  right: 1.15rem;
  bottom: 1.25rem;
  z-index: 86;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem .9rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--copper-300);
  background: rgba(11, 34, 57, .92);
  border: 1px solid var(--line-copper);
  border-radius: var(--radius-pill);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease), background var(--dur) var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { background: rgba(185, 134, 75, .24); }

@media (max-width: 720px) {
  .to-top {
    right: auto;
    left: .9rem;
    bottom: 1.25rem;
    font-size: .64rem;
  }
}

/* ============================================================
   通用组件
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.5rem;
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn--solid {
  background: var(--copper-500);
  color: var(--ink-950);
}

.btn--solid:hover {
  background: var(--copper-300);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--copper-300);
  border-color: var(--line-copper-strong);
}

.btn--ghost:hover {
  background: rgba(185, 134, 75, .14);
  color: var(--paper-050);
}

.btn--signal {
  background: var(--orange-500);
  color: var(--ink-950);
}

.btn--signal:hover { background: #ff9463; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--copper-500);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--copper-500);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--line-soft);
}

/* --- 面包屑 --- */
.breadcrumb { padding-block: 1.25rem; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .69rem;
  letter-spacing: .1em;
  color: rgba(185, 199, 211, .66);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--copper-500);
}

.breadcrumb__link {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.breadcrumb__link:hover { color: var(--copper-300); }

.breadcrumb__current { color: var(--paper-050); }

/* --- 面板 --- */
.panel {
  padding: clamp(1.25rem, 3vw, 2.25rem);
  background: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
}

.panel--glass {
  background: rgba(11, 34, 57, .58);
  border-color: var(--line-copper);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.panel--paper {
  background: var(--paper-050);
  border-color: rgba(6, 20, 37, .1);
  color: var(--ink-950);
}

.panel--paper .prose { color: #2B4054; }
.panel--paper .prose h2,
.panel--paper .prose h3,
.panel--paper .prose strong { color: var(--ink-950); }
.panel--paper .prose a { color: var(--ink-700); }
.panel--paper .prose code {
  background: rgba(23, 62, 92, .1);
  color: var(--ink-700);
}

/* --- 长文排版 --- */
.prose {
  max-width: 42em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(232, 238, 243, .88);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 2.1em;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  color: var(--paper-050);
}

.prose h3 {
  margin-top: 1.7em;
  font-size: clamp(1.08rem, 1.8vw, 1.22rem);
  color: var(--copper-300);
}

.prose a {
  color: var(--copper-300);
  text-decoration: underline;
  text-underline-offset: .22em;
}

.prose ul,
.prose ol {
  padding-left: 1.4em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: .45em; }

.prose strong { color: var(--paper-050); }

.prose code {
  padding: .1em .4em;
  font-family: var(--font-mono);
  font-size: .86em;
  color: var(--copper-300);
  background: rgba(23, 62, 92, .55);
  border-radius: 3px;
}

/* --- 图片容器基础规则 --- */
.media-frame {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(135deg, var(--ink-700), var(--ink-900) 55%, var(--ink-950)),
    linear-gradient(rgba(185, 199, 211, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 199, 211, .07) 1px, transparent 1px);
  background-size: auto, 40px 40px, 40px 40px;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame__cap {
  position: absolute;
  left: .85rem;
  bottom: .85rem;
  padding: .22rem .5rem;
  font-family: var(--font-mono);
  font-size: .63rem;
  letter-spacing: .14em;
  color: var(--copper-300);
  background: rgba(6, 20, 37, .74);
  border-radius: 2px;
}

/* --- 滚动显现 --- */
[data-reveal] {
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

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

/* --- 降低动效 --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

  .contact-rail__dot { animation: none !important; }
}