/* ============================================================
   天宝博体育 · 共享站点样式 /assets/site.css
   结构：reset → 变量 → 基础排版 → 工具类 → 头部 → 页脚
        → 通用组件 → 响应式 → 焦点与减少动态
   ============================================================ */

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

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

body {
  margin: 0;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, address {
  margin: 0;
}

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

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

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

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

/* ---------- 变量 ---------- */
:root {
  /* 珠宝色分区 */
  --ink: #0B2B26;
  --ink-2: #14243D;
  --lime: #C8FF3D;
  --coral: #FF5A4E;
  --steel: #A9BCC7;
  --paper: #F4F7F2;
  --wine: #6E1F32;
  --olive: #6F8F1E;
  --grey: #5B6B66;
  --white: #FFFFFF;

  --line: rgba(169, 188, 199, 0.28);
  --line-strong: rgba(169, 188, 199, 0.55);
  --line-dark: rgba(11, 43, 38, 0.16);

  --font-display: "HarmonyOS Sans SC", "PingFang SC", "Arial Narrow",
    "Helvetica Neue", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, "Courier New", monospace;

  --shell: 1200px;
  --gutter: clamp(16px, 4vw, 44px);
  --shadow: 0 20px 44px -30px rgba(4, 18, 16, 0.95);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 基础排版 ---------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
  overflow-wrap: break-word;
}

::selection {
  background: var(--lime);
  color: var(--ink);
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
}

/* 跳至主要内容 */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  transform: translateY(-200%);
  padding: 12px 20px;
  background: var(--lime);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: transform 0.18s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* 进入视口显现 */
html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 头部 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 18px 40px -34px rgba(0, 0, 0, 0.9);
}

/* 状态细带 */
.masthead__strip {
  background: var(--ink-2);
  border-bottom: 1px solid rgba(169, 188, 199, 0.18);
}

.masthead__strip-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 32px;
  padding-block: 4px;
}

.masthead__command {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.signal {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.18);
}

.masthead__clock {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
  white-space: nowrap;
}

.masthead__clock .mono {
  color: var(--lime);
  font-size: 11.5px;
}

.masthead__clock-label {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 10px;
  color: rgba(169, 188, 199, 0.72);
}

/* 主命令条 */
.masthead__bar {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 32px);
  min-height: 70px;
  padding-block: 10px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  position: relative;
  display: block;
  width: 36px;
  height: 36px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
  flex: 0 0 auto;
}

.brand__mark::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, transparent 45%, var(--ink) 45%, var(--ink) 55%, transparent 55%),
    linear-gradient(to bottom, transparent 43%, var(--ink) 43%, var(--ink) 53%, transparent 53%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--lime);
}

.brand--foot .brand__name {
  font-size: 20px;
}

/* 导航 */
.nav {
  margin-left: auto;
}

.nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
}

.nav__item {
  display: flex;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--steel);
  border: 1px solid transparent;
  transition: color 0.18s var(--ease), background 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(169, 188, 199, 0.5);
  transition: color 0.18s var(--ease);
}

.nav__link:hover {
  color: var(--paper);
  background: rgba(200, 255, 61, 0.08);
  border-color: var(--line);
}

.nav__link:hover .nav__index {
  color: var(--lime);
}

.nav__link[aria-current="page"] {
  color: var(--lime);
  background: rgba(200, 255, 61, 0.12);
  border-color: rgba(200, 255, 61, 0.38);
}

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

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--lime);
}

/* 动作区 */
.masthead__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  color: var(--paper);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--lime);
  background: rgba(200, 255, 61, 0.1);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--lime);
  box-shadow: 0 -6px 0 var(--lime), 0 6px 0 var(--lime);
}

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

/* 阅读进度 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(169, 188, 199, 0.16);
  pointer-events: none;
}

.scroll-meter__fill {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.12s linear;
}

/* ---------- 页脚 ---------- */
.foot {
  position: relative;
  background: var(--ink);
  border-top: 1px solid rgba(200, 255, 61, 0.32);
}

.foot::before {
  content: "";
  display: block;
  height: 5px;
  background: repeating-linear-gradient(
    90deg,
    var(--lime) 0 26px,
    transparent 26px 52px
  );
  opacity: 0.55;
}

.foot__top {
  padding-block: clamp(36px, 5.4vw, 68px);
  background:
    radial-gradient(120% 150% at 90% 0%, rgba(20, 36, 61, 0.95), rgba(11, 43, 38, 0) 68%),
    linear-gradient(180deg, rgba(11, 43, 38, 0.9), rgba(11, 43, 38, 0));
}

.foot__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 0.85fr));
  gap: clamp(22px, 3.4vw, 46px);
}

.foot__brand .brand {
  margin-bottom: 16px;
}

.foot__line {
  max-width: 26em;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 247, 242, 0.85);
}

.foot__note {
  max-width: 30em;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--steel);
}

.foot__brand .btn {
  margin-top: 20px;
}

.foot__title {
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(169, 188, 199, 0.24);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lime);
}

.foot__list {
  display: grid;
  gap: 2px;
}

.foot__link {
  display: inline-block;
  padding: 7px 0;
  font-size: 14.5px;
  color: rgba(244, 247, 242, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.foot__link:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* 页脚信息带 */
.foot__band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 48px);
  background: rgba(169, 188, 199, 0.22);
  border: 1px solid rgba(169, 188, 199, 0.22);
}

.foot__contact {
  padding: clamp(14px, 2vw, 20px);
  background: rgba(11, 43, 38, 0.92);
}

.foot__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.foot__value {
  margin-top: 6px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
}

.foot__contact--note .foot__label {
  color: var(--coral);
}

.foot__contact--note .foot__value {
  font-size: 13.5px;
  color: var(--steel);
}

/* 页脚法律条 */
.foot__bottom {
  background: var(--ink-2);
  border-top: 1px solid rgba(169, 188, 199, 0.2);
  padding-block: 14px;
}

.foot__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
}

.foot__legal {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(169, 188, 199, 0.8);
}

/* ---------- 通用组件：按钮 ---------- */
.btn {
  --btn-bg: var(--lime);
  --btn-fg: var(--ink);
  --btn-bd: var(--lime);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.btn:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--ink);
}

.btn--lime {
  --btn-bg: var(--lime);
  --btn-fg: var(--ink);
  --btn-bd: var(--lime);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: rgba(169, 188, 199, 0.55);
}

.btn--ghost:hover {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.btn--coral {
  --btn-bg: var(--coral);
  --btn-fg: #1A0A09;
  --btn-bd: var(--coral);
}

.btn--coral:hover {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}

.btn--sm {
  padding: 8px 14px;
  font-size: 12.5px;
}

.btn--cut {
  clip-path: polygon(
    0 0,
    calc(100% - 12px) 0,
    100% 12px,
    100% 100%,
    12px 100%,
    0 calc(100% - 12px)
  );
}

.btn--cut:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ink);
}

.btn--ghost.btn--cut:focus-visible {
  box-shadow: inset 0 0 0 2px var(--lime);
}

/* ---------- 通用组件：标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  background: transparent;
}

.tag--lime {
  color: var(--lime);
  background: rgba(200, 255, 61, 0.1);
}

.tag--coral {
  color: var(--coral);
  background: rgba(255, 90, 78, 0.12);
}

.tag--wine {
  color: #FFC9D2;
  background: var(--wine);
  border-color: var(--wine);
}

.tag--steel {
  color: var(--steel);
  background: rgba(169, 188, 199, 0.1);
}

/* ---------- 通用组件：章节 ---------- */
.section {
  padding-block: clamp(44px, 7vw, 96px);
}

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

.section--paper {
  background: var(--paper);
  color: var(--ink);
}

.section--indigo {
  background: var(--ink-2);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 28px;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--lime);
}

.section--paper .eyebrow {
  color: var(--wine);
}

.section--paper .eyebrow::before {
  background: var(--wine);
}

.section__title {
  font-size: clamp(28px, 4.4vw, 46px);
  color: var(--paper);
}

.section--paper .section__title {
  color: var(--ink);
}

.lede {
  max-width: 40em;
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--steel);
}

.section--paper .lede {
  color: var(--grey);
}

/* ---------- 通用组件：正文 ---------- */
.prose {
  max-width: 46em;
  color: rgba(244, 247, 242, 0.88);
}

.prose > * + * {
  margin-top: 1em;
}

.prose h2 {
  margin-top: 1.6em;
  font-size: clamp(22px, 2.6vw, 30px);
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.4em;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--paper);
}

.prose p {
  font-size: 16.5px;
  line-height: 1.8;
}

.prose strong {
  color: var(--lime);
  font-weight: 700;
}

.prose ul > li,
.prose ol > li {
  position: relative;
  padding-left: 22px;
  margin-top: 0.5em;
  font-size: 16px;
  line-height: 1.78;
}

.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.prose ol {
  counter-reset: prose-ol;
}

.prose ol > li {
  counter-increment: prose-ol;
}

.prose ol > li::before {
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1em;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--olive);
}

.prose a {
  color: var(--lime);
  border-bottom: 1px solid currentColor;
}

.prose a:hover {
  color: var(--paper);
}

.section--paper .prose {
  color: #2E3B37;
}

.section--paper .prose h2,
.section--paper .prose h3 {
  color: var(--ink);
}

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

/* ---------- 通用组件：网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

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

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

.grid--aside {
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.6fr);
  align-items: start;
}

/* ---------- 通用组件：卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background: rgba(20, 36, 61, 0.62);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.card--cut {
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.card__title {
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.2;
  color: var(--paper);
}

.card__body {
  font-size: 15.5px;
  line-height: 1.74;
  color: rgba(244, 247, 242, 0.8);
}

.card__meta {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.section--paper .card {
  background: var(--white);
  color: var(--ink);
  border-color: var(--line-dark);
}

.section--paper .card__title {
  color: var(--ink);
}

.section--paper .card__body {
  color: #3B4A46;
}

.section--paper .card__meta {
  color: var(--grey);
}

/* ---------- 通用组件：数据 ---------- */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 44px);
}

.stat {
  min-width: 118px;
}

.stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.section--paper .stat__num {
  color: var(--wine);
}

.section--paper .stat__label {
  color: var(--grey);
}

/* ---------- 通用组件：面包屑 ---------- */
.breadcrumb {
  background: rgba(20, 36, 61, 0.55);
  border-bottom: 1px solid var(--line);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--steel);
}

.breadcrumb__link {
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.breadcrumb__link:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.breadcrumb__sep {
  color: rgba(169, 188, 199, 0.45);
}

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

/* ---------- 通用组件：标签页 ---------- */
.tabs {
  background: rgba(20, 36, 61, 0.55);
  border: 1px solid var(--line);
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.tabs__tab {
  flex: 1 1 auto;
  min-width: 128px;
  padding: 13px 16px;
  background: rgba(11, 43, 38, 0.92);
  color: var(--steel);
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-align: center;
  transition: color 0.18s var(--ease), background 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.tabs__tab:hover {
  color: var(--paper);
  background: rgba(200, 255, 61, 0.1);
}

.tabs__tab[aria-selected="true"] {
  background: var(--lime);
  color: var(--ink);
  border-bottom-color: var(--lime);
}

.tabs__panel {
  padding: clamp(18px, 3vw, 30px);
}

.tabs__panel[hidden] {
  display: none;
}

/* ---------- 通用组件：图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(90deg, rgba(169, 188, 199, 0.14) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(169, 188, 199, 0.14) 0 1px, transparent 1px 40px),
    linear-gradient(150deg, #14243D, #0B2B26);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  background: rgba(11, 43, 38, 0.88);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

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

.media-frame--square {
  aspect-ratio: 1 / 1;
}

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

  .foot__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 980px) {
  .masthead__bar {
    min-height: 62px;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    padding: 8px var(--gutter) 20px;
    background: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 28px 44px -26px rgba(0, 0, 0, 0.95);
  }

  .masthead[data-open] .nav {
    display: block;
    animation: navDrop 0.2s var(--ease);
  }

  .nav__list {
    flex-direction: column;
    gap: 2px;
  }

  .nav__item {
    display: block;
  }

  .nav__link {
    display: flex;
    width: 100%;
    padding: 14px 12px;
    font-size: 15px;
    border-bottom: 1px solid rgba(169, 188, 199, 0.14);
  }

  .nav__link[aria-current="page"]::after {
    left: 12px;
    right: auto;
    bottom: 9px;
    width: 22px;
  }

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

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

  .grid--aside {
    grid-template-columns: minmax(0, 1fr);
  }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

@media (max-width: 760px) {
  .foot__band {
    grid-template-columns: minmax(0, 1fr);
  }

  .foot__bottom-inner {
    justify-content: flex-start;
  }

  .section__head {
    align-items: flex-start;
  }

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

@media (max-width: 640px) {
  .masthead__clock {
    display: none;
  }

  .brand__sub {
    display: none;
  }

  .brand__name {
    font-size: 16.5px;
  }

  .brand__mark {
    width: 30px;
    height: 30px;
  }

  .masthead__actions .btn {
    padding: 10px 12px;
    font-size: 12px;
  }

  .nav-toggle {
    padding: 9px 10px;
    font-size: 10px;
    letter-spacing: 0.12em;
  }

  .foot__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 560px) {
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .tags-wrap,
  .stat-row {
    gap: 14px;
  }

  .masthead__command {
    font-size: 10px;
    letter-spacing: 0.1em;
  }
}

@media (min-width: 981px) {
  .masthead[data-open] .nav {
    display: block;
  }
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.section--paper :focus-visible {
  outline-color: var(--wine);
}

.foot__link:focus-visible,
.nav__link:focus-visible {
  outline-offset: -3px;
}

/* ---------- 减少动态 ---------- */
@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;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }

  .scroll-meter__fill {
    transition: none;
  }

  .masthead[data-open] .nav {
    animation: none;
  }
}