/* ============================================================
   必一赛场 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 移动导航 / 页脚 / 基础组件
   ============================================================ */

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

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

html.is-nav-open { overflow: hidden; }

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

ul, ol { padding: 0; }

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

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

[hidden] { display: none !important; }

:root {
  --c-dusk: #0E1B2E;
  --c-stand: #16273D;
  --c-line: #22364F;
  --c-signal: #F0803C;
  --c-signal-soft: #FFC49A;
  --c-grass: #2E9E7E;
  --c-grass-soft: #7FD3B4;
  --c-silver: #C6CCD4;
  --c-ink: #EAF0F6;
  --c-mist: #9AA9BB;
  --c-clay: #B4483C;

  --font-display: "Oswald", "Archivo Narrow", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "Roboto Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --shell-max: 1280px;
  --gutter: clamp(16px, 4vw, 48px);
  --rail: 156px;
  --hairline: 1px solid var(--c-line);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 220ms;
  --shadow-card: 0 1px 0 rgba(255, 255, 255, .02), 0 22px 44px -34px rgba(0, 0, 0, .95);
  --ridge-poly: polygon(0 66%, 7% 52%, 15% 62%, 24% 40%, 33% 56%, 43% 30%, 52% 54%, 61% 42%, 70% 60%, 80% 46%, 89% 62%, 100% 50%, 100% 100%, 0 100%);
}

body {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--c-ink);
  background-color: var(--c-dusk);
  background-image:
    linear-gradient(180deg, rgba(22, 39, 61, .55) 0%, rgba(14, 27, 46, 0) 44%),
    repeating-linear-gradient(90deg, rgba(34, 54, 79, .34) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: .05em;
  line-height: 1.18;
  color: var(--c-ink);
}

a { color: inherit; }

strong { font-weight: 600; color: var(--c-ink); }

::selection {
  background: var(--c-signal);
  color: var(--c-dusk);
}

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

:focus:not(:focus-visible) { outline: none; }

/* ---------- 通用工具 ---------- */

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 880px; }

.num,
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .06em;
}

.mono { letter-spacing: .12em; }

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

.lead {
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.8;
  color: var(--c-silver);
  max-width: 62ch;
}

.note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mist);
  letter-spacing: .04em;
}

.meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

/* ---------- 按钮与标签 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: .14em;
  text-decoration: none;
  color: var(--c-dusk);
  background: var(--c-signal);
  border: 1px solid var(--c-signal);
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
              color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:hover {
  background: var(--c-signal-soft);
  border-color: var(--c-signal-soft);
  transform: translateY(-1px);
}

.btn--ghost {
  color: var(--c-ink);
  background: transparent;
  border-color: var(--c-line);
}

.btn--ghost:hover {
  color: var(--c-signal-soft);
  background: rgba(240, 128, 60, .08);
  border-color: var(--c-signal);
}

.btn--block { width: 100%; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-grass-soft);
  background: rgba(46, 158, 126, .07);
}

.tag--signal {
  color: var(--c-signal-soft);
  border-color: rgba(240, 128, 60, .38);
  background: rgba(240, 128, 60, .08);
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(14, 27, 46, .93);
  border-bottom: 1px solid var(--c-line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  background: rgba(11, 22, 38, .97);
  box-shadow: 0 24px 48px -40px rgba(0, 0, 0, .95);
}

html.is-nav-open .site-header { background: #0B1626; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-signal), var(--c-grass));
  z-index: 90;
  pointer-events: none;
}

.skip-link {
  position: absolute;
  top: -80px;
  left: var(--gutter);
  z-index: 100;
  padding: 10px 18px;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: .14em;
  color: var(--c-dusk);
  background: var(--c-signal);
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 10px; }

.site-header__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(16px, 2.6vw, 40px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 26px);
  min-width: 0;
}

.header-right { justify-content: flex-end; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-ink);
  white-space: nowrap;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-signal);
  border: 1px solid var(--c-line);
  background: linear-gradient(150deg, rgba(240, 128, 60, .18), rgba(14, 27, 46, 0) 68%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: .18em;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--c-mist);
}

.nav-cluster { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 22px);
  list-style: none;
}

.nav-list__item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 14.5px;
  letter-spacing: .08em;
  color: var(--c-silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 2px;
  height: 1px;
  background: var(--c-signal);
  transition: right var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--c-ink); }

.nav-link:hover::after,
.nav-link:focus-visible::after { right: 0; }

.nav-link[aria-current="page"] { color: var(--c-signal); }

.nav-link[aria-current="page"]::after {
  right: 0;
  background: var(--c-signal);
}

/* 比分刻度带 */
.score-rail {
  position: relative;
  min-width: 0;
  height: 32px;
  overflow: hidden;
  border-left: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}

.score-rail__track {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 100%;
  white-space: nowrap;
  will-change: transform;
  transition: transform 140ms linear;
}

.score-rail__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

.score-rail__num { color: var(--c-signal-soft); }

.header-utility {
  padding: 6px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-mist);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-utility:hover {
  color: var(--c-grass-soft);
  border-bottom-color: var(--c-grass);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  font-family: var(--font-display);
  font-size: 13.5px;
  letter-spacing: .14em;
  color: var(--c-dusk);
  background: var(--c-signal);
  border: 1px solid var(--c-signal);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-cta:hover {
  background: var(--c-signal-soft);
  border-color: var(--c-signal-soft);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: transparent;
  border: 1px solid var(--c-line);
  color: var(--c-ink);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(5.5px) 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(-5.5px) rotate(-45deg); }

.nav-toggle__label {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .16em;
}

/* ---------- 移动导航 ---------- */

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(6, 12, 22, .74);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.nav-scrim[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

.nav-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 55;
  display: none;
  flex-direction: column;
  width: min(88vw, 380px);
  padding: 104px var(--gutter) 28px;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--c-stand) 0%, var(--c-dusk) 78%);
  border-left: 1px solid var(--c-line);
  transform: translateX(102%);
  transition: transform 260ms var(--ease);
}

.nav-panel[data-open="true"] { transform: translateX(0); }

.nav-panel__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--c-grass-soft);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.nav-panel__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.nav-panel__item { border-bottom: 1px solid var(--c-line); }

.nav-panel__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 2px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: .06em;
  color: var(--c-ink);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.nav-panel__link:hover { color: var(--c-signal-soft); padding-left: 8px; }

.nav-panel__link[aria-current="page"] { color: var(--c-signal); }

.nav-panel__index {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-mist);
}

.nav-panel__foot {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
}

.nav-panel__hint {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-mist);
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 132px);
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--c-dusk) 0%, #091220 72%, #070F1A 100%);
  color: var(--c-mist);
}

.footer-ridge {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: clamp(64px, 12vw, 128px);
  background: linear-gradient(180deg, rgba(46, 158, 126, .16), rgba(14, 27, 46, 0) 92%);
  clip-path: var(--ridge-poly);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--c-line);
}

.footer-brand__link {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: .16em;
  color: var(--c-ink);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.footer-brand__link:hover { color: var(--c-signal); }

.footer-brand__line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .28em;
  color: var(--c-signal);
}

.footer-brand__note {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 40px);
}

.footer-col__title {
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .26em;
  color: var(--c-silver);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--c-ink);
  border-bottom-color: var(--c-signal);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px 32px;
  padding: clamp(24px, 3.5vw, 40px) 0;
  border-bottom: 1px solid var(--c-line);
}

.footer-contact__label {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-grass-soft);
}

.footer-contact__value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-ink);
  word-break: break-word;
}

.footer-contact__note {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-mist);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

.footer-legal,
.footer-sign,
.footer-year { margin: 0; }

.footer-sign { color: var(--c-silver); }

/* ---------- 编辑部骨架 ---------- */

.editorial {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 52px);
  align-items: start;
}

.editorial__rail {
  position: relative;
  min-width: 0;
}

.editorial__body { min-width: 0; }

.chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 6vw, 72px);
  line-height: .86;
  letter-spacing: .02em;
  color: rgba(240, 128, 60, .34);
}

@supports (-webkit-text-stroke: 1px red) {
  .chapter-no {
    color: transparent;
    -webkit-text-stroke: 1px rgba(240, 128, 60, .62);
  }
}

.chapter-title {
  margin-top: 14px;
  font-size: clamp(20px, 2.2vw, 28px);
  letter-spacing: .06em;
}

.rail-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-mist);
}

.rail-side {
  position: sticky;
  top: 96px;
}

/* ---------- 分区标题 ---------- */

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}

.section-head__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--c-grass-soft);
}

.section-head__title {
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: .06em;
}

.section-head__more {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.section-head__more:hover { color: var(--c-signal-soft); }

/* ---------- 网格与卡片 ---------- */

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 26px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2vw, 24px);
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--c-stand) 0%, rgba(22, 39, 61, .34) 100%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: #2E4A6B;
  box-shadow: var(--shadow-card);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-signal);
}

.card__title {
  margin: 10px 0 8px;
  font-size: clamp(18px, 1.8vw, 23px);
  letter-spacing: .05em;
}

.card__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

.card__link {
  color: inherit;
  text-decoration: none;
}

.card__link::after {
  content: "";
  position: absolute;
  inset: 0;
}

/* ---------- 折叠区 ---------- */

.fold {
  border: 1px solid var(--c-line);
  background: rgba(22, 39, 61, .55);
}

.fold + .fold { border-top: 0; }

.fold__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--c-silver);
  transition: color var(--dur) var(--ease);
}

.fold__summary::-webkit-details-marker { display: none; }

.fold__summary:hover { color: var(--c-ink); }

.fold__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--c-signal);
}

.fold[open] .fold__summary::after { content: "–"; }

.fold__body {
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 筛选 ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-btn {
  appearance: none;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-mist);
  background: transparent;
  border: 1px solid var(--c-line);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.filter-btn:hover { color: var(--c-ink); border-color: var(--c-silver); }

.filter-btn[aria-pressed="true"] {
  color: var(--c-signal-soft);
  border-color: var(--c-signal);
  background: rgba(240, 128, 60, .12);
}

.filter-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-mist);
}

.filter-empty {
  padding: 22px;
  border: 1px dashed var(--c-line);
  font-size: 14px;
  color: var(--c-mist);
  text-align: center;
}

/* ---------- 面包屑 / 正文 ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-mist);
}

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

.breadcrumb a:hover { color: var(--c-ink); }

.breadcrumb__sep { color: rgba(198, 204, 212, .42); }

.breadcrumb__current { color: var(--c-silver); }

.prose {
  max-width: 70ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: #DCE4EE;
}

.prose h2 {
  margin: 38px 0 14px;
  font-size: clamp(20px, 2.2vw, 28px);
  letter-spacing: .05em;
}

.prose h3 {
  margin: 28px 0 10px;
  font-size: clamp(17px, 1.6vw, 21px);
  letter-spacing: .04em;
  color: var(--c-silver);
}

.prose p { margin-bottom: 16px; }

.prose ul,
.prose ol {
  margin: 0 0 16px;
  padding-left: 1.2em;
}

.prose li { margin-bottom: 8px; }

.prose a {
  color: var(--c-signal-soft);
  text-underline-offset: 3px;
}

.prose blockquote {
  margin: 26px 0;
  padding: 6px 0 6px 18px;
  border-left: 2px solid var(--c-signal);
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--c-silver);
}

/* ---------- 图片容器 ---------- */

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background: var(--c-stand);
  border: 1px solid var(--c-line);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(158deg, rgba(240, 128, 60, .18), rgba(14, 27, 46, .62) 68%);
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame--std { aspect-ratio: 16 / 10; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 10px 14px;
  background: rgba(14, 27, 46, .8);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--c-silver);
}

/* ---------- 跨页阴山背景带 ---------- */

.ridge-band { position: relative; }

.ridge-band::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: min(38vh, 320px);
  background: linear-gradient(180deg, rgba(46, 158, 126, .07), rgba(14, 27, 46, 0) 92%);
  clip-path: var(--ridge-poly);
  pointer-events: none;
  z-index: 0;
}

/* ---------- 显现动效 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

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

/* ---------- 响应式 ---------- */

@media (max-width: 1279px) {
  .header-utility { display: none; }
}

@media (max-width: 1023px) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
  }

  .header-left { grid-column: 1; grid-row: 1; }
  .header-right { grid-column: 2; grid-row: 1; }

  .score-rail {
    grid-column: 1 / -1;
    grid-row: 2;
    height: 26px;
    border-left: 0;
    border-right: 0;
    border-top: 1px solid var(--c-line);
    margin-top: 4px;
  }

  .nav-cluster { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-panel { display: flex; }
}

@media (max-width: 1023px) and (min-width: 640px) {
  .brand__name { font-size: 20px; }
}

@media (max-width: 900px) {
  .footer-top { grid-template-columns: 1fr; }
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .editorial {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .editorial__rail {
    display: flex;
    align-items: baseline;
    gap: 16px;
    overflow-x: auto;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--c-line);
  }

  .chapter-no { font-size: 40px; }

  .chapter-title {
    margin-top: 0;
    font-size: 20px;
  }

  .rail-note {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
    white-space: nowrap;
  }

  .rail-side { position: static; }
}

@media (max-width: 639px) {
  body { font-size: 16px; }

  .site-header__inner { padding: 8px var(--gutter); }

  .brand__mark { width: 34px; height: 34px; }
  .brand__name { font-size: 17px; letter-spacing: .14em; }
  .brand__line { font-size: 10px; letter-spacing: .16em; }
  .nav-toggle__label { display: none; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .section-head__more { margin-left: 0; }
}

/* ---------- 减弱动效 ---------- */

@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] {
    opacity: 1;
    transform: none;
  }

  .score-rail__track { transition: none; }
}