/* ============================================================
   星空赛事 / starry-first-row.com.cn
   共享样式表 · /assets/site.css
   语汇：夜场看台 × 展览画册
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #0A111F;
  --ink-2: #16233A;
  --paper: #F1E9DC;
  --bone: #FBF7EF;
  --gold: #E4B44C;
  --gold-deep: #8A6A22;
  --neon: #B9FF4B;
  --live: #E2452B;
  --text: #17181A;
  --haze: #8698B3;
  --rule: #D8D2C6;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --shell: 1280px;
  --gut: clamp(18px, 4vw, 44px);
  --cut: 18px;
  --cut-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut),
      100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  --btn-cut: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%,
      12px 100%, 0 calc(100% - 12px));
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 124px;
}

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

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

ul, ol { list-style: none; }

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

a { color: inherit; text-decoration: none; }

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  background: var(--paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.sf-header :focus-visible,
.sf-footer :focus-visible { outline-color: var(--neon); }

/* ---------- 3. 排版原子 ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
}

.sf-display {
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.sf-h2 {
  font-size: clamp(26px, 3.6vw, 48px);
  font-weight: 800;
}

.sf-h3 {
  font-size: clamp(19px, 2.1vw, 28px);
  font-weight: 800;
}

.sf-lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.75;
  opacity: 0.8;
}

.sf-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--haze);
}

.sf-meta--gold { color: var(--gold); }
.sf-meta--deep { color: var(--gold-deep); }

.sf-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.sf-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器与网格 ---------- */
.sf-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.sf-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.sf-span-3 { grid-column: span 3; }
.sf-span-4 { grid-column: span 4; }
.sf-span-5 { grid-column: span 5; }
.sf-span-6 { grid-column: span 6; }
.sf-span-7 { grid-column: span 7; }
.sf-span-8 { grid-column: span 8; }
.sf-span-12 { grid-column: span 12; }

/* ---------- 5. 跳转链接 ---------- */
.sf-skip {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -160%);
  padding: 12px 24px;
  background: var(--neon);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%,
      10px 100%, 0 calc(100% - 10px));
  transition: transform 0.22s var(--ease);
}

.sf-skip:focus { transform: translate(-50%, 10px); }

/* ============================================================
   6. 页头
   ============================================================ */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink);
  color: var(--bone);
  border-bottom: 1px solid rgba(228, 180, 76, 0.24);
}

/* --- 6.1 上层品牌带 --- */
.sf-topbar {
  background: var(--ink);
}

.sf-topbar__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  padding-top: 13px;
  padding-bottom: 13px;
  transition: padding 0.3s var(--ease);
}

.sf-header[data-stuck] .sf-topbar__inner {
  padding-top: 5px;
  padding-bottom: 5px;
}

.sf-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.sf-brand__link {
  color: var(--bone);
  transition: color 0.2s var(--ease);
}

.sf-brand__link:hover { color: var(--neon); }

.sf-brand__dot {
  width: 5px;
  height: 5px;
  flex: none;
  align-self: center;
  background: var(--gold);
}

.sf-brand__sub {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.sf-topbar__tag {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--haze);
  transition: opacity 0.26s var(--ease), visibility 0.26s var(--ease);
}

.sf-topbar__tag::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 12px;
  margin-right: 14px;
  vertical-align: -1px;
  background: rgba(134, 152, 179, 0.5);
}

.sf-header[data-stuck] .sf-topbar__tag {
  opacity: 0;
  visibility: hidden;
}

.sf-topbar__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
}

.sf-topbar__link {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--haze);
  transition: color 0.2s var(--ease);
}

.sf-topbar__link:hover { color: var(--neon); }

.sf-topbar__member {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--gold);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%,
      9px 100%, 0 calc(100% - 9px));
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.sf-topbar__member:hover {
  background: var(--neon);
  color: var(--ink);
}

.sf-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.sf-status__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(185, 255, 75, 0.16);
  animation: sf-pulse 2.6s var(--ease) infinite;
}

@keyframes sf-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

/* --- 6.2 下层栏目带 --- */
.sf-navbar {
  background: rgba(10, 17, 31, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-top: 1px solid rgba(134, 152, 179, 0.16);
  border-bottom: 1px solid rgba(228, 180, 76, 0.3);
}

.sf-navbar__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 58px;
}

.sf-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.sf-nav__list {
  display: flex;
  align-items: stretch;
  gap: clamp(2px, 1.2vw, 16px);
}

.sf-nav__item { display: flex; }

.sf-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 18px 10px 20px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--bone);
  transition: color 0.2s var(--ease);
}

.sf-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 11px;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.sf-nav__link:hover { color: var(--neon); }
.sf-nav__link:hover::after { transform: scaleX(1); }

.sf-nav__link[aria-current="page"] {
  color: var(--neon);
}

.sf-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.sf-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--haze);
  transition: color 0.2s var(--ease);
}

.sf-nav__link:hover .sf-nav__num,
.sf-nav__link[aria-current="page"] .sf-nav__num { color: var(--gold); }

.sf-nav__aside { display: none; }

.sf-navbar__meta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.sf-navbar__clock {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

/* --- 6.3 汉堡按钮 --- */
.sf-burger {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--bone);
  border: 1px solid rgba(134, 152, 179, 0.45);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%,
      9px 100%, 0 calc(100% - 9px));
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.sf-burger:hover { border-color: var(--neon); color: var(--neon); }

.sf-burger__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.sf-burger__bars span {
  display: block;
  height: 2px;
  background: var(--neon);
}

/* --- 6.4 移动端遮罩 --- */
.sf-scrim {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: rgba(6, 10, 18, 0.74);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.26s var(--ease), visibility 0.26s var(--ease);
}

.sf-header[data-open] .sf-scrim {
  opacity: 1;
  visibility: visible;
}

/* ============================================================
   7. 页脚
   ============================================================ */
.sf-footer {
  position: relative;
  background: var(--ink);
  color: var(--bone);
  overflow: hidden;
}

.sf-footer__orbit {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 120px;
  pointer-events: none;
  opacity: 0.9;
}

.sf-footer__orbit svg { width: 100%; height: 100%; }

.sf-footer__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 2.6fr);
  gap: clamp(32px, 5vw, 80px);
  padding-top: clamp(60px, 7vw, 108px);
  padding-bottom: clamp(40px, 5vw, 68px);
}

.sf-footer__brand { min-width: 0; }

.sf-footer__logo {
  font-size: clamp(24px, 2.4vw, 32px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--bone);
  line-height: 1.1;
}

.sf-footer__tag {
  margin-top: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.sf-footer__domain {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--haze);
  word-break: break-word;
}

.sf-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 42px);
}

.sf-fcol { min-width: 0; }

.sf-fcol__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--bone);
}

.sf-fcol__title::before {
  content: "";
  width: 14px;
  height: 2px;
  flex: none;
  background: var(--gold);
}

.sf-fcol__list {
  display: grid;
  gap: 11px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

.sf-fcol__list a {
  color: var(--haze);
  transition: color 0.2s var(--ease);
}

.sf-fcol__list a:hover { color: var(--neon); }

.sf-fcol__list--plain li { word-break: break-word; }

.sf-fcol__key {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.sf-footer__legal {
  position: relative;
  border-top: 1px solid rgba(134, 152, 179, 0.22);
}

.sf-footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding-top: 22px;
  padding-bottom: 30px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.sf-footer__legal-note { color: rgba(134, 152, 179, 0.82); }

/* --- 7.1 返回顶部 --- */
.sf-totop {
  position: fixed;
  right: clamp(16px, 3vw, 40px);
  bottom: clamp(16px, 3vw, 40px);
  z-index: 70;
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  background: rgba(22, 35, 58, 0.94);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%,
      10px 100%, 0 calc(100% - 10px));
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
    visibility 0.24s var(--ease);
}

.sf-totop[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.sf-totop:hover { background: var(--ink-2); }

.sf-totop__ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.sf-totop__track {
  fill: none;
  stroke: rgba(134, 152, 179, 0.32);
  stroke-width: 2;
}

.sf-totop__bar {
  fill: none;
  stroke: var(--neon);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 119.38;
  stroke-dashoffset: 119.38;
  transition: stroke-dashoffset 0.1s linear;
}

.sf-totop__arrow {
  position: relative;
  font-size: 16px;
  line-height: 1;
  color: var(--bone);
}

/* ============================================================
   8. 通用按钮 / 标签
   ============================================================ */
.sf-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  clip-path: var(--btn-cut);
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
    transform 0.22s var(--ease);
}

.sf-btn--gold { background: var(--gold); color: var(--ink); }
.sf-btn--gold:hover { background: #f0c463; }

.sf-btn--neon { background: var(--neon); color: var(--ink); }
.sf-btn--neon:hover { background: #cdff78; }

.sf-btn--ink { background: var(--ink); color: var(--bone); }
.sf-btn--ink:hover { color: var(--neon); }

.sf-btn--outline {
  background: transparent;
  color: var(--bone);
  box-shadow: inset 0 0 0 1px rgba(134, 152, 179, 0.55);
}

.sf-btn--outline:hover {
  background: var(--ink-2);
  color: var(--neon);
}

.sf-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  background: rgba(228, 180, 76, 0.16);
  color: var(--gold-deep);
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%,
      7px 100%, 0 calc(100% - 7px));
}

.sf-tag--neon { background: var(--neon); color: var(--ink); }
.sf-tag--live { background: var(--live); color: #fff; }

/* ============================================================
   9. 面包屑 / 正文 / 表格
   ============================================================ */
.sf-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

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

.sf-crumbs li + li::before {
  content: "";
  width: 12px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}

.sf-crumbs a {
  color: var(--haze);
  transition: color 0.2s var(--ease);
}

.sf-crumbs a:hover { color: var(--gold); }

.sf-prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.9;
}

.sf-prose > * + * { margin-top: 1.1em; }

.sf-prose h2 {
  font-size: clamp(22px, 2.4vw, 30px);
  margin-top: 2em;
}

.sf-prose h3 {
  font-size: clamp(18px, 1.8vw, 22px);
  margin-top: 1.6em;
}

.sf-prose ul {
  display: grid;
  gap: 10px;
}

.sf-prose ul li {
  position: relative;
  padding-left: 20px;
}

.sf-prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

.sf-prose--dark { color: var(--bone); }
.sf-prose--dark ul li::before { background: var(--neon); }

.sf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.sf-table th,
.sf-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.sf-table th {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
}

.sf-table .sf-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.sf-table--dark th,
.sf-table--dark td {
  border-bottom-color: rgba(134, 152, 179, 0.26);
  color: var(--bone);
}

.sf-table--dark th { color: var(--gold); }

/* ============================================================
   10. 卡片 / 图片框 / 框景
   ============================================================ */
.sf-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 32px);
  background: var(--bone);
  color: var(--text);
  clip-path: var(--cut-path);
  border-top: 3px solid var(--gold);
}

.sf-card--paper { background: var(--paper); }

.sf-card--dark {
  background: var(--ink-2);
  color: var(--bone);
  border-top-color: var(--neon);
}

.sf-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
}

.sf-card--dark .sf-card__num { color: var(--gold); }

.sf-card__title {
  margin-top: 10px;
  font-size: clamp(19px, 1.8vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.sf-card__text {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  opacity: 0.84;
}

.sf-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--ink-2);
  clip-path: var(--cut-path);
}

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

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

.sf-frame__ph {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(228, 180, 76, 0.16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(134, 152, 179, 0.16) 0 1px,
      transparent 1px 44px),
    var(--ink-2);
}

.sf-viewport {
  position: relative;
  padding: clamp(28px, 5vw, 76px);
  background: var(--ink);
  color: var(--bone);
  clip-path: var(--cut-path);
  overflow: hidden;
}

.sf-viewport--glow::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto;
  height: 72%;
  background: radial-gradient(60% 100% at 50% 0%, rgba(228, 180, 76, 0.24),
      transparent 70%);
  pointer-events: none;
}

.sf-viewport__inner { position: relative; z-index: 1; }

.sf-viewport__ticks {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 26px;
  background-image: repeating-linear-gradient(90deg,
      rgba(228, 180, 76, 0.38) 0 1px, transparent 1px 32px);
  background-size: auto 10px;
  background-repeat: repeat-x;
  background-position: 0 100%;
  pointer-events: none;
}

/* ============================================================
   11. 章节 / 刻度 / 轨道 / 计时
   ============================================================ */
.sf-chapter {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(12px, 2vw, 24px);
  color: var(--bone);
}

.sf-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.sf-chapter__title {
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.sf-chapter__note {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.sf-chapter--paper { color: var(--text); }
.sf-chapter--paper .sf-chapter__num { color: var(--gold-deep); }

.sf-ruler {
  height: 16px;
  background-image: repeating-linear-gradient(90deg, var(--rule) 0 1px,
      transparent 1px 28px);
  background-size: auto 8px;
  background-repeat: repeat-x;
  background-position: 0 100%;
}

.sf-ruler--dark {
  background-image: repeating-linear-gradient(90deg,
      rgba(228, 180, 76, 0.6) 0 1px, transparent 1px 28px);
}

.sf-orbit {
  position: relative;
  height: 1px;
  background: linear-gradient(90deg, transparent,
      rgba(228, 180, 76, 0.5), transparent);
}

.sf-meter {
  height: 4px;
  background: rgba(134, 152, 179, 0.25);
  overflow: hidden;
}

.sf-meter__fill {
  height: 100%;
  width: 100%;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--neon), var(--live));
}

/* ============================================================
   12. 显现动效
   ============================================================ */
html.sf-js [data-reveal] {
  opacity: 0;
  transform: translate3d(-14px, 18px, 0);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

html.sf-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-toc-link][data-active] {
  color: var(--neon);
}

/* ============================================================
   13. 响应式
   ============================================================ */
@media (max-width: 1100px) {
  .sf-footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .sf-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1024px) {
  .sf-span-3,
  .sf-span-4 { grid-column: span 6; }
  .sf-span-5,
  .sf-span-6,
  .sf-span-7,
  .sf-span-8 { grid-column: span 12; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 96px; }

  .sf-burger { display: inline-flex; }

  .sf-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    width: min(88vw, 360px);
    display: flex;
    flex-direction: column;
    padding: 28px 24px 36px;
    background: var(--ink);
    border-left: 1px solid rgba(228, 180, 76, 0.32);
    overflow-y: auto;
    transform: translateX(102%);
    transition: transform 0.34s var(--ease);
  }

  .sf-nav[data-open] { transform: translateX(0); }

  .sf-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .sf-nav__item { display: block; }

  .sf-nav__link {
    padding: 17px 4px;
    font-size: 18px;
    border-bottom: 1px solid rgba(134, 152, 179, 0.18);
  }

  .sf-nav__link::after {
    left: 4px;
    right: auto;
    bottom: 12px;
    width: 34px;
  }

  .sf-nav__aside {
    display: block;
    margin-top: auto;
    padding-top: 26px;
    border-top: 1px solid rgba(134, 152, 179, 0.22);
  }

  .sf-nav__aside-title {
    margin-bottom: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--haze);
  }

  .sf-nav__aside-link {
    display: block;
    margin-top: 14px;
    font-size: 14px;
    color: var(--haze);
    transition: color 0.2s var(--ease);
  }

  .sf-nav__aside-link:hover { color: var(--neon); }

  .sf-navbar__clock { display: none; }
}

@media (max-width: 760px) {
  .sf-topbar__tag { display: none; }
  .sf-topbar__inner { gap: 12px; }
  .sf-topbar__actions { gap: 12px; }
}

@media (max-width: 640px) {
  .sf-span-3,
  .sf-span-4,
  .sf-span-5,
  .sf-span-6,
  .sf-span-7,
  .sf-span-8 { grid-column: span 12; }

  .sf-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .sf-status { display: none; }
  .sf-brand__sub { display: none; }
  .sf-footer__legal-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .sf-burger__text { display: none; }
  .sf-topbar__member { padding: 7px 12px; }
}

/* ============================================================
   14. 减少动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html { scroll-behavior: auto; }

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

  .sf-status__dot { animation: none; }
}