/* ============================================================
   OP7 中文站 · 共享样式表 /assets/site.css
   构图：居中刊头 + 左右分屏 + 纸张叠层
   色彩：深空蓝基底 / 霓虹青授权 / 琥珀橙直营
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::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, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

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

button { background: none; border: 0; cursor: pointer; }

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

table { border-collapse: collapse; width: 100%; }

hr { border: 0; border-top: 1px solid rgba(159, 179, 200, 0.22); margin: 0; }

address { font-style: normal; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-space: #061A33;
  --c-navy: #0C2547;
  --c-navy-deep: #081F3C;
  --c-cyan: #22D3EE;
  --c-amber: #F59E0B;
  --c-star: #EAF4FF;
  --c-mist: #9FB3C8;
  --c-paper: #F3E9D9;
  --c-green: #34D399;

  --c-line: rgba(159, 179, 200, 0.22);
  --c-line-soft: rgba(159, 179, 200, 0.14);
  --c-line-cyan: rgba(34, 211, 238, 0.42);
  --c-line-amber: rgba(245, 158, 11, 0.5);

  --f-display: "OP7 Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  --f-mono: "OP7 Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --f-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, "SimSun", serif;

  --w-page: 1440px;
  --w-text: 1180px;
  --w-read: 68ch;

  --sp-1: 0.5rem;
  --sp-2: 0.85rem;
  --sp-3: 1.25rem;
  --sp-4: 2rem;
  --sp-5: 3rem;
  --sp-6: 4.5rem;

  --r-sm: 2px;
  --r-md: 3px;

  --shadow-paper: 0 0 0 1px rgba(6, 26, 51, 0.12), 7px 7px 0 rgba(12, 37, 71, 0.5);
  --shadow-float: 0 24px 60px -40px rgba(0, 0, 0, 0.95);

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-fast: 180ms;
  --t-mid: 260ms;
}

/* ---------- 3. 星图底纹与全局排版 ---------- */
body {
  position: relative;
  min-height: 100vh;
  background-color: var(--c-space);
  color: var(--c-star);
  font-family: var(--f-mono);
  font-size: 1rem;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(58% 44% at 14% 4%, rgba(34, 211, 238, 0.15), transparent 72%),
    radial-gradient(50% 40% at 92% 2%, rgba(245, 158, 11, 0.11), transparent 72%),
    linear-gradient(rgba(159, 179, 200, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 179, 200, 0.055) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
}

#main-content {
  position: relative;
  z-index: 1;
  scroll-margin-top: 104px;
  display: block;
}

#main-content a:not([class]) {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.06em;
}

strong, b { color: var(--c-amber); font-weight: 700; letter-spacing: 0.04em; }

::selection { background: var(--c-cyan); color: #04192b; }

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -6rem;
  z-index: 200;
  display: inline-block;
  padding: 0.6rem 1rem;
  background: var(--c-amber);
  color: #1f1300;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  border-radius: var(--r-sm);
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus { top: 1rem; }

/* ---------- 5. 居中刊头 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 26, 51, 0.94);
  border-bottom: 1px solid var(--c-line-cyan);
  box-shadow: 0 22px 50px -40px rgba(0, 0, 0, 1);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
}

.masthead__inner {
  width: min(var(--w-page), 100% - 2.5rem);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--sp-3);
  padding-block: var(--sp-2);
}

.masthead__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-amber));
  transition: transform 90ms linear;
  pointer-events: none;
}

/* 品牌锁定组 */
.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding-right: 1.4rem;
  border-right: 1px solid var(--c-line);
}

.brand__mark {
  font-family: var(--f-display);
  font-size: clamp(1.45rem, 2.3vw, 2.05rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--c-star);
}

.brand__meta {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
}

.brand__wordmark {
  font-family: var(--f-display);
  font-size: 0.78rem;
  letter-spacing: 0.34em;
  color: var(--c-star);
}

.brand__edition {
  align-self: flex-start;
  padding: 0.08rem 0.4rem;
  border: 1px solid var(--c-line-amber);
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

/* 居中栏目 */
.nav {
  justify-self: center;
  min-width: 0;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.5rem);
  counter-reset: nav-counter;
}

.nav__item { counter-increment: nav-counter; }

.nav__link {
  position: relative;
  display: block;
  padding: 0.5rem 0.2rem 0.6rem;
  font-family: var(--f-display);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease);
}

.nav__link::before { content: none; }

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--t-mid) var(--ease);
}

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

.nav__link[aria-current="page"] { color: var(--c-star); }
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-amber);
}

/* 右侧工具区 */
.masthead__tools {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.index-toggle,
.mail-copy,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.index-toggle::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 8px rgba(34, 211, 238, 0.9);
}

.nav-toggle::before {
  content: "";
  width: 9px;
  height: 9px;
  margin-right: 0.45rem;
  border: 1px solid currentColor;
  border-radius: 1px;
}

.index-toggle:hover,
.mail-copy:hover,
.nav-toggle:hover,
.index-toggle[aria-expanded="true"] {
  color: var(--c-star);
  border-color: var(--c-cyan);
  background: rgba(34, 211, 238, 0.09);
}

.mail-copy[data-copied] {
  color: var(--c-green);
  border-color: rgba(52, 211, 153, 0.6);
  background: rgba(52, 211, 153, 0.1);
}

.nav-toggle { display: none; }

/* 省级区划索引抽屉 */
.province-panel {
  width: min(var(--w-page), 100% - 2.5rem);
  margin-inline: auto;
  padding: 1rem 0 1.35rem;
  border-top: 1px solid var(--c-line-cyan);
  animation: op7-drop 240ms var(--ease) both;
}

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

@keyframes op7-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

.province-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
}

.province-panel__label {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--c-mist);
}

.province-panel__status {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.province-panel__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.province-chip {
  padding: 0.38rem 0.72rem;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(6, 26, 51, 0.62);
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.province-chip:hover {
  color: var(--c-star);
  border-color: var(--c-cyan);
}

.province-chip[aria-pressed="true"] {
  background: var(--c-amber);
  border-color: var(--c-amber);
  color: #231400;
  font-weight: 700;
}

/* ---------- 6. 通用容器与分屏骨架 ---------- */
.wrap {
  width: min(var(--w-text), 100% - 2.5rem);
  margin-inline: auto;
}

.page-shell {
  width: min(var(--w-page), 100% - 2.5rem);
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding-block: var(--sp-3) var(--sp-6);
}

.page-body { min-width: 0; }

/* 左侧省级索引轨 */
.rail {
  min-width: 0;
}

.rail__label {
  display: block;
  margin-bottom: 0.7rem;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  color: var(--c-mist);
}

.rail__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-line);
}

.rail__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0.55rem;
  border-bottom: 1px solid var(--c-line-soft);
  border-left: 2px solid transparent;
  font-family: var(--f-mono);
  font-size: 0.82rem;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.rail__link:hover {
  color: var(--c-star);
  background: rgba(34, 211, 238, 0.07);
  padding-left: 0.9rem;
}

.rail__link[aria-current="page"] {
  color: var(--c-star);
  border-left-color: var(--c-amber);
  background: rgba(245, 158, 11, 0.07);
}

.rail__num {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

/* ---------- 7. 面包屑 ---------- */
.crumb {
  padding-block: 1.1rem 0.4rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}

.crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.crumb__list > li { display: inline-flex; align-items: center; gap: 0.5rem; }

.crumb__list > li::after {
  content: "/";
  color: rgba(159, 179, 200, 0.42);
}

.crumb__list > li:last-child::after { content: ""; }

.crumb a { color: var(--c-cyan); }
.crumb a:hover { color: var(--c-star); }

.crumb [aria-current="page"] { color: var(--c-star); }

/* ---------- 8. 编号章节与文本 ---------- */
.sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  padding-top: var(--sp-4);
  margin-bottom: var(--sp-2);
  border-top: 1px solid var(--c-line);
}

.sec-num {
  font-family: var(--f-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--c-amber);
}

.sec-title {
  font-size: clamp(1.5rem, 2.9vw, 2.35rem);
  letter-spacing: 0.05em;
  color: var(--c-star);
}

.lede {
  max-width: var(--w-read);
  font-family: var(--f-serif);
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
  line-height: 1.9;
  color: #D2E5F8;
}

.prose { max-width: var(--w-read); }

.prose p + p { margin-top: 1rem; }

.muted { color: var(--c-mist); }

.note {
  padding: 0.45rem 0 0.45rem 1rem;
  border-left: 2px solid var(--c-cyan);
  font-family: var(--f-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.note--amber { border-left-color: var(--c-amber); }

/* ---------- 9. 面板 / 纸张叠层 ---------- */
.panel {
  padding: var(--sp-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-navy);
}

.panel--paper {
  background: var(--c-paper);
  color: var(--c-navy);
  border-color: rgba(12, 37, 71, 0.28);
  box-shadow: var(--shadow-paper);
}

.panel--paper a:not([class]) { color: var(--c-navy); }

.panel--paper .muted { color: #3E5A79; }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-bottom: 0.7rem;
  margin-bottom: 0.9rem;
  border-bottom: 1px solid var(--c-line);
}

.panel--paper .panel__head { border-bottom-color: rgba(12, 37, 71, 0.22); }

.panel__title {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

/* ---------- 10. 标签 / 按钮 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid;
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tag--direct {
  color: var(--c-amber);
  border-color: var(--c-line-amber);
  background: rgba(245, 158, 11, 0.1);
}

.tag--auth {
  color: var(--c-cyan);
  border-color: var(--c-line-cyan);
  background: rgba(34, 211, 238, 0.1);
}

.tag--ok {
  color: var(--c-green);
  border-color: rgba(52, 211, 153, 0.5);
  background: rgba(52, 211, 153, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: var(--f-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  transition: transform var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.btn--cyan { background: var(--c-cyan); color: #04192B; }
.btn--amber { background: var(--c-amber); color: #231400; }

.btn--ghost {
  border-color: var(--c-line-cyan);
  background: rgba(34, 211, 238, 0.07);
  color: var(--c-cyan);
}

.btn:hover { transform: translateY(-2px); }
.btn--cyan:hover { background: #5BE4F5; }
.btn--amber:hover { background: #FFB733; }
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-star); }

/* ---------- 11. 网格 ---------- */
.grid { display: grid; gap: var(--sp-3); }

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

/* ---------- 12. 图片容器（供页面阶段放置素材） ---------- */
.figure { margin: 0; }

.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(159, 179, 200, 0.28);
  border-radius: var(--r-sm);
  background: linear-gradient(148deg, var(--c-navy), var(--c-space));
}

.figure__frame > img,
.figure__frame > svg,
.figure__frame > picture {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(159, 179, 200, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 179, 200, 0.13) 1px, transparent 1px);
  background-size: 30px 30px;
  opacity: 0.72;
}

.figure__frame--wide { aspect-ratio: 16 / 9; }
.figure__frame--tall { aspect-ratio: 3 / 4; }

.figure__caption {
  padding-top: 0.6rem;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

/* ---------- 13. 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

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

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--sp-6);
  background: var(--c-navy);
  border-top: 1px solid var(--c-cyan);
}

.footer__inner {
  width: min(var(--w-page), 100% - 2.5rem);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--sp-4);
  padding: var(--sp-5) 0 var(--sp-3);
}

.footer__col { min-width: 0; }

.footer__mark {
  font-family: var(--f-display);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--c-star);
}

.footer__wordmark {
  margin-top: 0.35rem;
  font-family: var(--f-display);
  font-size: 0.76rem;
  letter-spacing: 0.34em;
  color: var(--c-mist);
}

.footer__note {
  margin-top: 0.85rem;
  max-width: 34ch;
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer__icp {
  margin-top: 0.85rem;
  font-family: var(--f-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

.footer__address {
  margin-top: 0.85rem;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer__title {
  padding-bottom: 0.6rem;
  margin-bottom: 0.9rem;
  border-bottom: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
}

.footer__list li + li { margin-top: 0.45rem; }

.footer__link {
  font-size: 0.86rem;
  color: var(--c-star);
  transition: color var(--t-fast) var(--ease);
}

.footer__link:hover { color: var(--c-cyan); }

.footer__text {
  font-size: 0.82rem;
  color: var(--c-mist);
  word-break: break-all;
}

.footer__bottom {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

/* ---------- 15. 断点 ---------- */
@media (max-width: 1180px) {
  .footer__inner { grid-template-columns: 1.3fr 1fr 1fr; }
}

@media (max-width: 1080px) {
  .masthead__inner {
    grid-template-columns: 1fr auto;
    justify-content: space-between;
  }

  .brand {
    padding-right: 0;
    border-right: 0;
  }

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

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    justify-self: stretch;
    max-height: min(72vh, 32rem);
    overflow-y: auto;
    padding: var(--sp-2) 1.25rem var(--sp-3);
    background: var(--c-navy-deep);
    border-top: 1px solid var(--c-line-cyan);
    border-bottom: 1px solid var(--c-line-cyan);
    box-shadow: var(--shadow-float);
  }

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

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__item { border-top: 1px solid var(--c-line-soft); }
  .nav__item:first-child { border-top: 0; }

  .nav__link {
    display: flex;
    align-items: baseline;
    gap: 0.9rem;
    padding: 0.85rem 0;
    font-size: 1rem;
    letter-spacing: 0.18em;
  }

  .nav__link::before {
    content: counter(nav-counter, decimal-leading-zero);
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--c-cyan);
  }

  .nav__link::after { display: none; }

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

  .page-shell { padding-block: var(--sp-2) var(--sp-5); }
}

@media (max-width: 1024px) {
  .footer__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

@media (max-width: 800px) {
  .mail-copy { display: none; }
}

@media (max-width: 620px) {
  .footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-3);
    padding-top: var(--sp-4);
  }

  .footer__note { max-width: none; }

  .masthead__inner,
  .province-panel,
  .page-shell,
  .wrap,
  .footer__inner { width: min(var(--w-page), 100% - 2rem); }

  .province-panel__grid { gap: 0.4rem; }

  .sec-head { padding-top: var(--sp-3); }
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

  .masthead__progress { display: none; }

  .btn:hover { transform: none; }
}