/* ==========================================================================
   博亚赛场 · 共享样式 /assets/site.css
   夜间赛场仪表盘 · 杂志报头 · 等宽索引
   ========================================================================== */

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

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

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

ul, ol { list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }

:root {
  color-scheme: dark;

  --ink-900: #0A1626;
  --ink-800: #102A43;
  --ink-700: #173F5F;
  --cyan: #00E5D0;
  --amber: #FF6A2B;
  --paper: #F6F1E7;
  --mist: #C7D3DF;
  --steel: #7A8CA3;
  --green: #2BD9A6;

  --line: rgba(199, 211, 223, .16);
  --line-strong: rgba(199, 211, 223, .34);
  --cyan-line: rgba(0, 229, 208, .42);
  --amber-line: rgba(255, 106, 43, .46);

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

  --wrap: 1180px;
  --wrap-narrow: 820px;
  --gutter: clamp(18px, 4.4vw, 48px);

  --r-sm: 10px;
  --r-md: 18px;
  --r-lg: 26px;

  --ease: cubic-bezier(.2, .8, .2, 1);
  --dur: .32s;

  --shadow-deep: 0 30px 80px -50px rgba(0, 0, 0, .95);
}

/* ---------- 基础排版 ---------- */

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(1rem, .55vw + .88rem, 1.075rem);
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 78% at 78% -12%, rgba(0, 229, 208, .10), transparent 56%),
    radial-gradient(96% 72% at 0% 0%, rgba(255, 106, 43, .09), transparent 62%);
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--paper);
  text-wrap: balance;
}

h1 { font-size: clamp(2.2rem, 6vw, 5.2rem); letter-spacing: .04em; line-height: 1.02; }
h2 { font-size: clamp(1.65rem, 3.4vw, 2.8rem); }
h3 { font-size: clamp(1.12rem, 1.9vw, 1.45rem); font-weight: 800; }

p { max-width: 34em; text-wrap: pretty; }

.mono {
  font-family: var(--font-mono);
  font-size: .78em;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}

.lede {
  font-size: clamp(1.02rem, 1.3vw, 1.24rem);
  line-height: 1.72;
  color: var(--mist);
  max-width: 30em;
}

.link-cyan {
  color: var(--cyan);
  border-bottom: 1px solid var(--cyan-line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.link-cyan:hover { border-bottom-color: var(--cyan); }

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

/* ---------- 布局容器 ---------- */

.wrap {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(100% - var(--gutter) * 2, var(--wrap-narrow));
  margin-inline: auto;
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4.4vw, 56px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: clamp(24px, 4vw, 44px);
}

/* ---------- 跳过链接 ---------- */

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 400;
  transform: translate(-50%, -160%);
  padding: .72em 1.4em;
  background: var(--cyan);
  color: #06131f;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 刊头 / 头部 ---------- */

.masthead {
  position: relative;
  z-index: 80;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 150% at 50% -50%, rgba(0, 229, 208, .11), transparent 62%),
    linear-gradient(180deg, rgba(16, 42, 67, .88), rgba(10, 22, 38, 0));
  border-bottom: 1px solid var(--line);
}

.masthead__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .35rem 1.2rem;
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-block: 13px;
  border-bottom: 1px dashed var(--line);
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: .67rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--steel);
}

.masthead__core {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-block: clamp(20px, 3.4vw, 38px) clamp(10px, 1.6vw, 16px);
  text-align: center;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: .55rem;
}

.brand__name {
  font-size: clamp(2.1rem, 6.6vw, 4.7rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: .14em;
  text-indent: .14em;
  color: var(--paper);
  transition: color var(--dur) var(--ease), text-shadow var(--dur) var(--ease);
}
.brand:hover .brand__name {
  color: var(--cyan);
  text-shadow: 0 0 32px rgba(0, 229, 208, .28);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--mist);
}

.masthead__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-bottom: clamp(14px, 2.2vw, 22px);
}

/* 检索触发器 */
.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .5em 1em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.search-trigger:hover { color: var(--paper); border-color: var(--cyan-line); background: rgba(0, 229, 208, .07); }
.search-trigger[aria-expanded="true"] { color: var(--cyan); border-color: var(--cyan); background: rgba(0, 229, 208, .12); }

.search-trigger__icon {
  position: relative;
  display: block;
  width: 11px;
  height: 11px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
}
.search-trigger__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -2px;
  width: 6px;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transform: rotate(45deg);
}

/* 版本徽章 */
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .4em .85em;
  border: 1px solid var(--cyan-line);
  border-radius: 999px;
  background: rgba(0, 229, 208, .08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  white-space: nowrap;
}
.version-badge__label { color: var(--mist); letter-spacing: .1em; }

/* 移动目录按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .5em 1em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan-line); background: rgba(0, 229, 208, .07); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
  transition: background var(--dur) var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

/* 检索面板 */
.site-search {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin: 0 auto clamp(16px, 2.4vw, 24px);
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: linear-gradient(155deg, rgba(23, 63, 95, .92), rgba(10, 22, 38, .97));
  box-shadow: var(--shadow-deep);
}

.site-search__label {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.site-search__input {
  width: 100%;
  padding: .85em 1em;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: rgba(10, 22, 38, .72);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .86rem;
  letter-spacing: .04em;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-search__input::placeholder { color: var(--steel); letter-spacing: .08em; }
.site-search__input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 208, .16);
}

.site-search__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr));
  gap: .5rem;
  margin-top: .9rem;
}

.site-search__item > a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .7em;
  padding: .62em .82em;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-size: .86rem;
  color: var(--mist);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-search__item > a:hover {
  color: var(--paper);
  border-color: var(--cyan-line);
  background: rgba(0, 229, 208, .07);
}
.site-search__item .mono { color: var(--steel); }

.site-search__empty {
  margin-top: .9rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--steel);
}

/* 栏目条 */
.masthead__nav {
  width: 100%;
  background: linear-gradient(180deg, rgba(16, 42, 67, .74), rgba(10, 22, 38, .3));
  border-top: 1px solid var(--line);
}

.nav-strip {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: clamp(.15rem, 1.2vw, 1.3rem);
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-block: .7rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
}

.nav-strip__item { flex: 0 0 auto; scroll-snap-align: start; }

.nav-link {
  display: flex;
  flex-direction: column;
  gap: .18rem;
  min-width: max-content;
  padding: .5rem .85rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .2em;
  color: var(--steel);
  transition: color var(--dur) var(--ease);
}

.nav-link__label {
  font-size: .94rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.nav-link:hover { background: rgba(0, 229, 208, .07); border-color: var(--cyan-line); }
.nav-link:hover .nav-link__index { color: var(--cyan); }
.nav-link:hover .nav-link__label { color: var(--paper); }

.nav-link[aria-current="page"] {
  background: rgba(255, 106, 43, .11);
  border-color: var(--amber-line);
}
.nav-link[aria-current="page"] .nav-link__index { color: var(--amber); }
.nav-link[aria-current="page"] .nav-link__label { color: var(--paper); }

/* ---------- 通用按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  padding: .74em 1.26em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
              border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--cyan-line); background: rgba(0, 229, 208, .08); }
.btn:active { transform: translateY(0); }

.btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-900);
  font-weight: 700;
}
.btn--amber:hover { background: #ff8148; border-color: #ff8148; color: var(--ink-900); }

.btn--cyan { color: var(--cyan); border-color: var(--cyan-line); }
.btn--cyan:hover { background: rgba(0, 229, 208, .13); }

.btn--sm { padding: .52em .96em; font-size: .68rem; }

/* ---------- 页脚 / 版权页 ---------- */

.colophon {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 6.4vw, 84px) 0 clamp(22px, 3vw, 34px);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 100% at 100% 0%, rgba(255, 106, 43, .11), transparent 58%),
    radial-gradient(90% 100% at 0% 100%, rgba(0, 229, 208, .08), transparent 60%);
  border-top: 1px solid var(--line-strong);
}
.colophon::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--amber) 26%, var(--cyan) 64%, transparent);
  opacity: .62;
  pointer-events: none;
}

.colophon__inner {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  display: grid;
  gap: clamp(26px, 4vw, 54px);
}

.colophon__mark {
  display: block;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--steel);
}

.colophon__wordmark {
  font-size: clamp(1.9rem, 4.6vw, 3.1rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: .12em;
  color: var(--paper);
}

.colophon__summary {
  margin-top: 1rem;
  max-width: 22em;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--mist);
}

.colophon__cols {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 168px), 1fr));
}

.colophon__heading {
  margin-bottom: .85rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .67rem;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.colophon__list li + li { margin-top: .15rem; }

.colophon__list a {
  display: inline-block;
  padding-block: .24rem;
  font-size: .92rem;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.colophon__list a:hover { color: var(--paper); border-bottom-color: var(--cyan-line); }

.colophon__contact { display: grid; gap: .7rem; }

.colophon__contact li {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .03em;
  color: var(--mist);
  word-break: break-word;
}

.colophon__contact-label {
  display: block;
  margin-bottom: .12rem;
  font-family: var(--font-sans);
  font-size: .64rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}

.colophon__note {
  margin-top: .9rem;
  max-width: 26em;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--steel);
}

.colophon__link {
  color: var(--cyan);
  border-bottom: 1px solid var(--cyan-line);
}
.colophon__link:hover { border-bottom-color: var(--cyan); }

.colophon__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  margin-top: clamp(8px, 1.6vw, 18px);
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--steel);
}

/* ---------- 通用内容组件 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-family: var(--font-mono);
  font-size: .69rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  opacity: .75;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem 1.4rem;
  padding-bottom: clamp(14px, 2vw, 20px);
  margin-bottom: clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--line);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--amber);
}

.section-head__title {
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  font-weight: 900;
  letter-spacing: .03em;
}

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(23, 63, 95, .62), rgba(16, 42, 67, .32));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-line);
  background: linear-gradient(160deg, rgba(23, 63, 95, .82), rgba(16, 42, 67, .44));
}

.card__index {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--amber);
}

.card__title {
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  font-weight: 800;
  letter-spacing: .03em;
  color: var(--paper);
}

.card__body {
  margin-top: .6rem;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--mist);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .28em .74em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}
.pill--ok { color: var(--green); border-color: rgba(43, 217, 166, .5); background: rgba(43, 217, 166, .09); }
.pill--hot { color: var(--amber); border-color: var(--amber-line); background: rgba(255, 106, 43, .12); }

/* 可复用图片容器基础规则 */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background-color: var(--ink-800);
  background-image:
    radial-gradient(120% 120% at 18% 8%, rgba(0, 229, 208, .20), transparent 56%),
    radial-gradient(90% 90% at 92% 92%, rgba(255, 106, 43, .24), transparent 62%),
    linear-gradient(160deg, var(--ink-800), var(--ink-900));
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(246, 241, 231, .07) 0 1px, transparent 1px 44px);
}
.media-frame > img,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--slant { clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%); border-radius: var(--r-md); }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45em;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--steel);
}
.breadcrumbs a { color: var(--mist); transition: color var(--dur) var(--ease); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs__sep { color: var(--steel); }

/* ---------- 滚动进度条 ---------- */

.reading-rail {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 300;
  height: 2px;
  pointer-events: none;
}
.reading-rail__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ---------- 滚动显现 ---------- */

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
  transition-delay: calc(var(--reveal-delay, 0) * 1ms);
}
.reveal-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 900px) {
  .colophon__inner { grid-template-columns: minmax(0, .85fr) minmax(0, 1.55fr); align-items: start; }
  .colophon__meta { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
}

@media (max-width: 860px) {
  .masthead__top { justify-content: center; text-align: center; }
  .mono-tag { font-size: .62rem; letter-spacing: .16em; }
  .brand__tagline { letter-spacing: .22em; font-size: .64rem; }

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

  .masthead__nav {
    display: none;
    border-top: 1px solid var(--line-strong);
    background: linear-gradient(180deg, rgba(16, 42, 67, .96), rgba(10, 22, 38, .96));
  }
  .masthead__nav[data-open] {
    display: block;
    animation: navDrop .3s var(--ease) both;
  }

  .nav-strip {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: .35rem var(--gutter) 1rem;
    overflow-x: visible;
    scroll-snap-type: none;
  }
  .nav-strip__item { flex: 1 1 auto; }

  .nav-link {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .9rem .35rem;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
  }
  .nav-link__label { font-size: 1rem; }
  .nav-link:hover { background: rgba(0, 229, 208, .06); }
  .nav-link[aria-current="page"] { background: rgba(255, 106, 43, .1); border-color: transparent; border-bottom-color: var(--amber-line); }

  .version-badge__label { display: none; }
}

@media (max-width: 560px) {
  .masthead__tools { gap: .45rem; }
  .search-trigger,
  .nav-toggle,
  .version-badge { font-size: .64rem; padding: .5em .8em; }
  .colophon__meta { font-size: .64rem; letter-spacing: .06em; }
  .colophon__note { font-size: .74rem; }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal-ready [data-reveal] { opacity: 1; transform: none; }
  .reading-rail { display: none; }
  .btn:hover,
  .card:hover { transform: none; }
  .masthead__nav[data-open] { animation: none; }
}