/* ==========================================================================
   天行体育 · 全站共享样式 /assets/site.css
   深夜战术室：墨蓝结构 + 草皮绿行动 + 信号橙数值 + 纸白阅读
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  background: #0B1622;
}

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

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

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

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

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

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

table { border-collapse: collapse; border-spacing: 0; }

hr { border: 0; border-top: 1px solid var(--ink-700); margin: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1622;
  --ink-800: #10202F;
  --ink-700: #1B3243;
  --turf-500: #1FA36B;
  --turf-300: #6FD9A6;
  --signal-500: #FF6B2C;
  --signal-200: #FFD3B8;
  --paper-50: #F6F3EC;
  --paper-100: #E7E2D6;
  --grey-400: #9AA7B1;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-panel: "Barlow Condensed", "Oswald", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-data: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step-1: 12px;
  --step-2: 14px;
  --step-3: 16px;
  --step-4: 20px;
  --step-5: 28px;
  --step-6: 40px;
  --step-7: 56px;

  --header-h: 72px;
  --header-h-compact: 56px;
  --shell: 1280px;
  --rail: 300px;

  --shadow-print: 2px 2px 0 var(--ink-700);
  --cut: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  background: var(--ink-900);
  color: var(--paper-50);
  font-family: var(--font-body);
  font-size: var(--step-3);
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { padding-top: var(--header-h); }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; }

p { overflow-wrap: break-word; }

::selection { background: var(--signal-500); color: var(--ink-900); }

/* ---------- 4. 工具类 ---------- */
.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;
}

.skip-link {
  position: fixed;
  top: 10px; left: 10px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-panel);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  border: 1px solid var(--ink-900);
  transform: translateY(-180%);
  transition: transform 0.2s ease-out;
}
.skip-link:focus { transform: translateY(0); }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 32px);
}

.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-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-main-rail { grid-template-columns: minmax(0, 1fr) var(--rail); align-items: start; }

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-panel);
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: 0;
  clip-path: var(--cut);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-sm { padding: 7px 12px; font-size: var(--step-1); }

.btn-cta { background: var(--signal-500); color: var(--ink-900); border-color: var(--signal-500); }
.btn-cta:hover { background: var(--signal-200); border-color: var(--signal-200); }

.btn-primary { background: var(--turf-500); color: var(--ink-900); border-color: var(--turf-500); }
.btn-primary:hover { background: var(--turf-300); border-color: var(--turf-300); }

.btn-ghost { background: transparent; color: var(--paper-50); border-color: var(--ink-700); }
.btn-ghost:hover { border-color: var(--turf-500); color: var(--turf-300); }

.btn:active { transform: translateY(1px); }

/* ---------- 6. 头部 ---------- */
.site-header {
  --h: var(--header-h);
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  height: var(--h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: height 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 22, 34, 0.9), rgba(11, 22, 34, 0.08));
  transition: opacity 0.3s ease;
}
.site-header[data-solid] {
  --h: var(--header-h-compact);
  background: var(--ink-900);
  border-bottom-color: var(--ink-700);
}
.site-header[data-solid]::before { opacity: 0; }

.header-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  height: 100%;
  padding: 0 clamp(16px, 3vw, 32px);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--turf-500);
  color: var(--ink-900);
  font-family: var(--font-panel);
  font-weight: 700;
  font-size: var(--step-4);
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}
.brand-word { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-panel);
  font-weight: 700;
  font-size: var(--step-3);
  letter-spacing: 0.1em;
  color: var(--paper-50);
}
.brand-sub {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--grey-400);
}
.brand--footer .brand-mark { width: 38px; height: 38px; }
.brand--footer .brand-name { font-size: var(--step-4); }

/* 导航 */
.site-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav-item { display: block; }
.nav-link {
  display: inline-block;
  padding: 8px 11px;
  font-family: var(--font-panel);
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: rgba(246, 243, 236, 0.78);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.nav-link:hover { color: var(--paper-50); background: rgba(31, 163, 107, 0.15); }
.nav-link[aria-current="page"] {
  color: var(--paper-50);
  border-bottom-color: var(--signal-500);
}

.nav-foot { display: none; }
.nav-foot-note { font-size: var(--step-1); color: var(--grey-400); letter-spacing: 0.04em; margin-top: 12px; }

/* 工具带 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.season-switch {
  display: inline-flex;
  border: 1px solid var(--ink-700);
  background: rgba(16, 32, 47, 0.72);
}
.season-btn {
  padding: 7px 12px;
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--grey-400);
  border-right: 1px solid var(--ink-700);
  transition: background-color 0.2s ease, color 0.2s ease;
}
.season-btn:last-child { border-right: 0; }
.season-btn:hover { color: var(--paper-50); }
.season-btn[aria-pressed="true"] { background: var(--turf-500); color: var(--ink-900); }

.season-switch--stack { display: flex; flex-direction: column; width: 100%; }
.season-switch--stack .season-btn {
  border-right: 0;
  border-bottom: 1px solid var(--ink-700);
  text-align: left;
  padding: 12px 14px;
  font-size: var(--step-2);
}
.season-switch--stack .season-btn:last-child { border-bottom: 0; }

.header-search { position: relative; }
.search-input {
  width: 190px;
  min-width: 0;
  padding: 8px 10px;
  background: rgba(11, 22, 34, 0.72);
  border: 1px solid var(--ink-700);
  border-radius: 0;
  color: var(--paper-50);
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.02em;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-input::placeholder { color: var(--grey-400); font-family: var(--font-body); }
.search-input:focus {
  outline: none;
  border-color: var(--turf-500);
  box-shadow: inset 0 -2px 0 var(--turf-500);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--ink-700);
  color: var(--paper-50);
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
}
.nav-toggle:hover { border-color: var(--turf-500); }
.nav-toggle-bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 3px;
  z-index: 3;
  pointer-events: none;
}
.read-progress-bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: var(--signal-500);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: var(--ink-900);
  border-top: 1px solid var(--ink-700);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: min(42%, 440px);
  height: 3px;
  background: linear-gradient(90deg, var(--turf-500), var(--signal-500));
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 68px) clamp(16px, 3vw, 32px) 36px;
  display: grid;
  grid-template-columns: 1.1fr 2.1fr 1.5fr;
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand { min-width: 0; }
.footer-claim {
  margin-top: 16px;
  font-size: var(--step-2);
  line-height: 1.75;
  color: rgba(246, 243, 236, 0.7);
  max-width: 30em;
}
.footer-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}
.footer-col-title {
  font-family: var(--font-panel);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--turf-300);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--ink-700);
}
.footer-links li + li { margin-top: 9px; }
.footer-links a {
  font-size: var(--step-2);
  color: rgba(246, 243, 236, 0.74);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-links a:hover { color: var(--paper-50); border-bottom-color: var(--signal-500); }

.footer-contact { min-width: 0; }
.footer-contact-line {
  display: flex;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(246, 243, 236, 0.74);
  margin-bottom: 8px;
  font-family: var(--font-data);
}
.footer-contact-line .label {
  flex: 0 0 auto;
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--grey-400);
  padding-top: 2px;
}
.footer-note {
  margin-top: 12px;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--grey-400);
  border-left: 2px solid var(--signal-500);
  padding-left: 10px;
}

.footer-legal { border-top: 1px solid var(--ink-700); }
.footer-legal-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px clamp(16px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: var(--step-1);
  color: var(--grey-400);
  letter-spacing: 0.04em;
}
.footer-legal-line { font-family: var(--font-data); }
.footer-copy { font-family: var(--font-panel); letter-spacing: 0.1em; }

/* ---------- 8. 通用组件 ---------- */
.section { position: relative; padding: clamp(48px, 7vw, 88px) 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--turf-300);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--signal-500); }

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.01em;
  line-height: 1.28;
  color: var(--paper-50);
}
.display-italic { font-style: italic; }

.chapter-no {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-data);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  background: var(--paper-100);
  color: var(--ink-900);
  border: 1px solid var(--ink-900);
}

.panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  box-shadow: var(--shadow-print);
  transition: border-color 0.3s ease;
}
.panel.is-active { border-color: var(--turf-500); }
.panel-stack > .panel + .panel { margin-top: -8px; }
.panel-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 18px;
  border-bottom: 1px solid var(--ink-700);
  background: linear-gradient(180deg, rgba(27, 50, 67, 0.65), rgba(16, 32, 47, 0));
}
.panel-title {
  font-family: var(--font-panel);
  font-weight: 700;
  font-size: var(--step-3);
  letter-spacing: 0.1em;
  color: var(--paper-50);
}
.panel-body { padding: 18px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--ink-700);
  background: rgba(16, 32, 47, 0.78);
  color: var(--paper-100);
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  line-height: 1.5;
}

.league-tone-1 { --league: hsl(0 58% 62%); }
.league-tone-2 { --league: hsl(30 58% 62%); }
.league-tone-3 { --league: hsl(60 58% 62%); }
.league-tone-4 { --league: hsl(90 58% 62%); }
.league-tone-5 { --league: hsl(120 58% 62%); }
.league-tone-6 { --league: hsl(150 58% 62%); }
.league-tone-7 { --league: hsl(180 58% 62%); }
.league-tone-8 { --league: hsl(210 58% 62%); }
.league-tone-9 { --league: hsl(240 58% 62%); }
.league-tone-10 { --league: hsl(270 58% 62%); }
.league-tone-11 { --league: hsl(300 58% 62%); }
.league-tone-12 { --league: hsl(330 58% 62%); }

.league-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 9px;
  border: 1px solid var(--league, var(--ink-700));
  background: rgba(16, 32, 47, 0.6);
  color: var(--paper-50);
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  line-height: 1.5;
}
.league-chip::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--league, var(--turf-500));
}
.league-dot {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--league, var(--turf-500));
}

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.data-table {
  width: 100%;
  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.5;
}
.data-table caption {
  caption-side: top;
  text-align: left;
  padding: 10px 12px;
  background: var(--ink-800);
  color: var(--grey-400);
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
}
.data-table th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 10px 12px;
  background: var(--ink-700);
  color: var(--paper-50);
  font-family: var(--font-panel);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--ink-900);
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--paper-100);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.data-table tbody tr:nth-child(even) { background: rgba(231, 226, 214, 0.55); }
.data-table tbody tr:hover { background: var(--signal-200); }
.data-table tbody tr:hover td:first-child { box-shadow: inset 3px 0 0 var(--league, var(--turf-500)); }
.data-num { text-align: right; font-variant-numeric: tabular-nums; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--grey-400);
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--ink-700); }
.breadcrumb a:hover { color: var(--turf-300); }
.breadcrumb [aria-current="page"] { color: var(--paper-50); }

.prose {
  max-width: 42em;
  color: rgba(246, 243, 236, 0.88);
  font-size: var(--step-3);
  line-height: 1.85;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--font-display);
  font-size: var(--step-5);
  letter-spacing: -0.01em;
  color: var(--paper-50);
  margin-top: 1.6em;
}
.prose h3 {
  font-family: var(--font-panel);
  font-size: var(--step-4);
  letter-spacing: 0.06em;
  color: var(--turf-300);
  margin-top: 1.5em;
}
.prose a { border-bottom: 1px solid var(--signal-500); }
.prose a:hover { color: var(--signal-200); }
.prose strong { color: var(--paper-50); }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { list-style: square; }
.prose ol li { list-style: decimal; }
.prose code, .prose kbd {
  font-family: var(--font-data);
  font-size: 0.92em;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  padding: 1px 5px;
}
.prose blockquote {
  border-left: 3px solid var(--turf-500);
  padding: 4px 0 4px 16px;
  color: var(--grey-400);
}

/* 图片容器基础规则（页面阶段直接放 <img> 占位） */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(246, 243, 236, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 243, 236, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--avatar { aspect-ratio: 1 / 1; border-radius: 8px; }
.media-frame--avatar::after { border-radius: 8px; }

/* 时间轴 / 更新日志 */
.ledger { border-left: 1px solid var(--ink-700); padding-left: 18px; }
.ledger-row { position: relative; padding: 10px 0; }
.ledger-row::before {
  content: "";
  position: absolute;
  left: -23px; top: 18px;
  width: 9px; height: 9px;
  background: var(--league, var(--turf-500));
}

/* ---------- 9. 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--turf-300);
  outline-offset: 2px;
}
.search-input:focus-visible { outline-offset: 0; }

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-search { display: none; }
  .nav-link { padding: 8px 8px; font-size: 13px; }
}

@media (max-width: 1040px) {
  .header-tools .season-switch { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1024px) {
  .grid-main-rail { grid-template-columns: minmax(0, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  html.nav-open { overflow: hidden; }

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

  .site-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 70;
    max-height: 100vh;
    overflow-y: auto;
    padding: calc(var(--header-h-compact) + 14px) clamp(16px, 3vw, 32px) 28px;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    background: var(--ink-800);
    border-bottom: 1px solid var(--ink-700);
    box-shadow: var(--shadow-print);
    transform: translateY(-101%);
    visibility: hidden;
    transition: transform 0.32s ease, visibility 0.32s ease;
  }
  .site-nav[data-open] { transform: translateY(0); visibility: visible; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: var(--step-3);
    border-bottom: 1px solid var(--ink-700);
    border-left: 2px solid transparent;
  }
  .nav-link:hover { background: rgba(31, 163, 107, 0.12); }
  .nav-link[aria-current="page"] {
    color: var(--turf-300);
    border-bottom-color: var(--ink-700);
    border-left-color: var(--signal-500);
    padding-left: 12px;
    background: rgba(31, 163, 107, 0.1);
  }

  .nav-foot {
    display: block;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--ink-700);
  }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  main { padding-top: 64px; }
  .brand-sub { display: none; }
  .btn-cta { padding: 9px 12px; font-size: var(--step-1); }
  .section-title { font-size: 26px; }
  .footer-inner { grid-template-columns: 1fr; padding-bottom: 28px; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal-inner { flex-direction: column; align-items: flex-start; }
  .data-table { font-size: var(--step-1); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .nav-toggle-label { display: none; }
  .footer-nav { grid-template-columns: 1fr; }
}

/* ---------- 11. 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;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .site-nav { transition: none !important; }
}