/* ==========================================================================
   九洲指南 · 共享样式表 /assets/site.css
   DNA：堆叠面板 · 框架式导航 · 左侧入口状态栏 · 青绿→靛蓝渐变 · 暖金点缀
   ========================================================================== */

/* 1 · 重置 */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, li, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
[hidden] { display: none !important; }

/* 2 · 变量 */
:root {
  --c-indigo: #101F3C;
  --c-panel: #1B3A6B;
  --c-teal: #0E7C6B;
  --c-teal-deep: #0A4F46;
  --c-sky: #6EC3B6;
  --c-gold: #D9A441;
  --c-amber: #F2A93B;
  --c-mist: #E6F2EF;
  --c-paper: #F7FAF8;
  --c-ink: #16211F;
  --c-slate: #5B6B78;
  --c-text: #C9DCD9;

  --grad-route: linear-gradient(135deg, #0E7C6B 0%, #2A6C86 48%, #1B3A6B 100%);
  --grad-edge: linear-gradient(90deg, #0E7C6B, #6EC3B6 40%, rgba(110,195,182,0) 75%);

  --rail-w: 72px;
  --header-h: 78px;
  --wrap: 1180px;
  --gap: clamp(16px, 2.4vw, 28px);
  --r-sm: 3px;
  --r-md: 5px;
  --r-lg: 8px;
  --shadow-1: 0 22px 60px -34px rgba(4, 10, 22, .92);
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
@media (max-width: 1099px) {
  :root { --rail-w: 0px; --header-h: 66px; }
}

/* 3 · 中文排版与页面底色 */
body {
  font-family: var(--font);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  color: var(--c-text);
  background-color: var(--c-indigo);
  background-image:
    radial-gradient(1000px 640px at 86% -12%, rgba(110, 195, 182, .16), transparent 68%),
    radial-gradient(780px 560px at 2% 4%, rgba(14, 124, 107, .22), transparent 70%),
    radial-gradient(640px 640px at 102% 102%, rgba(217, 164, 65, .09), transparent 66%);
  padding-top: var(--header-h);
  padding-left: var(--rail-w);
  min-height: 100vh;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-radial-gradient(circle at 12% 84%, transparent 0 46px, rgba(110, 195, 182, .05) 46px 47px),
    repeating-radial-gradient(circle at 88% 12%, transparent 0 62px, rgba(110, 195, 182, .035) 62px 63px),
    repeating-linear-gradient(64deg, rgba(110, 195, 182, .04) 0 1px, transparent 1px 34px);
}

h1, h2, h3, h4 { color: var(--c-paper); line-height: 1.12; font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: clamp(2.4rem, 6vw, 5.5rem); font-weight: 300; letter-spacing: -.03em; margin-bottom: .35em; }
h2 { font-size: clamp(1.4rem, 2.2vw, 2.2rem); margin-bottom: .5em; }
h3 { font-size: clamp(1.05rem, 1.5vw, 1.25rem); margin-bottom: .5em; letter-spacing: .01em; }
p { margin-bottom: 1.05em; }
p:last-child { margin-bottom: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: currentColor; opacity: .75; }
.lead { font-size: clamp(1.02rem, 1.4vw, 1.15rem); line-height: 1.8; color: #DCEAE7; max-width: 62ch; }
.muted { color: var(--c-slate); }

/* 4 · 布局骨架 */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: clamp(18px, 4vw, 40px); }
.wrap--narrow { max-width: 860px; }
main { position: relative; z-index: 1; display: block; }
.site-footer { position: relative; z-index: 1; }
.section { position: relative; padding-block: clamp(30px, 5.5vw, 76px); }
.section--tight { padding-block: clamp(20px, 3vw, 40px); }
.section__head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: clamp(18px, 2.6vw, 32px); }
.page-head { padding-block: clamp(26px, 5vw, 60px) 0; }
.stack > * + * { margin-top: var(--gap); }
.stack--tight > * + * { margin-top: 12px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--split { grid-template-columns: 1fr; }
@media (min-width: 960px) {
  .grid--split { grid-template-columns: .92fr 1.08fr; align-items: start; }
}

/* 5 · 跳转链接与焦点 */
:focus-visible { outline: 2px solid var(--c-amber); outline-offset: 3px; border-radius: 2px; }
.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 12px);
  z-index: 200;
  transform: translateY(-180%);
  padding: 10px 18px;
  background: var(--c-amber);
  color: #20160A;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: transform .2s ease;
}
.skip-link:focus { transform: none; }

/* 6 · 左侧入口状态栏 */
.status-rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  z-index: 80;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 18px 6px 22px;
  background: linear-gradient(180deg, rgba(27, 58, 107, .78), rgba(16, 31, 60, .94));
  border-right: 1px solid rgba(110, 195, 182, .18);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.status-rail__mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--grad-route);
  color: var(--c-paper);
  font-size: 15px;
  font-weight: 700;
  box-shadow: inset 0 0 0 1px rgba(247, 250, 248, .2);
}
.status-rail__label { font-size: 11px; font-weight: 600; letter-spacing: .3em; color: var(--c-sky); writing-mode: vertical-rl; }
.status-rail__list { display: flex; flex-direction: column; align-items: center; gap: 18px; margin: auto 0; }
.status-rail__meta { font-size: 10px; letter-spacing: .24em; color: var(--c-slate); writing-mode: vertical-rl; }

.status-dot { display: inline-flex; align-items: center; gap: 8px; font-size: 11px; font-weight: 600; letter-spacing: .18em; color: var(--c-slate); }
.status-dot__mark { width: 9px; height: 9px; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 4px rgba(255, 255, 255, .04); }
.status-dot--live { color: var(--c-sky); }
.status-dot--live .status-dot__mark { animation: dotPulse 2.8s ease-out infinite; }
.status-dot--upkeep { color: var(--c-amber); }
.status-dot--updated { color: var(--c-gold); }
.status-rail .status-dot { flex-direction: column; gap: 10px; }
.status-rail .status-dot__text { writing-mode: vertical-rl; letter-spacing: .28em; }
@keyframes dotPulse {
  0% { box-shadow: 0 0 0 0 rgba(110, 195, 182, .45); }
  70% { box-shadow: 0 0 0 10px rgba(110, 195, 182, 0); }
  100% { box-shadow: 0 0 0 0 rgba(110, 195, 182, 0); }
}
@media (max-width: 1099px) { .status-rail { display: none; } }

/* 7 · 头部框架式导航 */
.site-header {
  position: fixed;
  top: 0; right: 0; left: var(--rail-w);
  height: var(--header-h);
  z-index: 70;
  background: rgba(16, 31, 60, .86);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid rgba(110, 195, 182, .18);
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-edge);
  opacity: .8;
}
.site-header__frame {
  height: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 40px);
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 36px);
}

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; flex: 0 0 auto; }
.brand__mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--grad-route);
  color: var(--c-paper);
  font-size: 18px;
  font-weight: 700;
  box-shadow: inset 0 0 0 1px rgba(247, 250, 248, .18);
}
.brand__text { display: flex; flex-direction: column; }
.brand__name { font-size: 17px; font-weight: 700; letter-spacing: .14em; color: var(--c-paper); line-height: 1.2; }
.brand__tagline { font-size: 11px; letter-spacing: .12em; color: var(--c-sky); opacity: .9; margin-top: 3px; }
.brand--footer .brand__mark { width: 30px; height: 30px; font-size: 14px; }
.brand--footer .brand__name { font-size: 15px; }

.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(110, 195, 182, .08);
  color: var(--c-sky);
  border: 1px solid rgba(110, 195, 182, .3);
  border-radius: var(--r-sm);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}
.nav-toggle:hover { color: var(--c-paper); border-color: var(--c-sky); background: rgba(110, 195, 182, .16); }
.nav-toggle__bars { position: relative; display: block; width: 18px; height: 2px; background: currentColor; transition: background-color .18s ease; }
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: currentColor;
  transition: transform .22s ease, top .22s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.site-nav { display: flex; align-items: center; gap: clamp(8px, 1.6vw, 22px); margin-left: auto; }
.site-nav__list { display: flex; align-items: center; gap: 2px; counter-reset: navidx; }
.site-nav__list li { counter-increment: navidx; }
.site-nav__list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  color: #B6CCC8;
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: color .18s ease, background-color .18s ease;
}
.site-nav__list a::before {
  content: counter(navidx, decimal-leading-zero);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--c-slate);
  transition: color .18s ease;
}
.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 3px;
  height: 2px;
  background: var(--c-amber);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .2s ease;
}
.site-nav__list a:hover { color: var(--c-paper); background: rgba(110, 195, 182, .1); }
.site-nav__list a:hover::before { color: var(--c-sky); }
.site-nav__list a[aria-current="page"] { color: var(--c-amber); background: rgba(242, 169, 59, .1); }
.site-nav__list a[aria-current="page"]::before { color: var(--c-amber); }
.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__cta { padding: 10px 18px; font-size: 13px; white-space: nowrap; }
.nav-status { display: none; }
.nav-status__title { font-size: 12px; font-weight: 600; letter-spacing: .22em; color: var(--c-sky); }
.nav-status__list { display: flex; flex-wrap: wrap; gap: 16px; }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-teal), var(--c-sky) 55%, var(--c-gold));
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0; bottom: 0;
    display: block;
    margin: 0;
    padding: 14px clamp(18px, 5vw, 32px) 48px;
    background: linear-gradient(180deg, rgba(16, 31, 60, .98), rgba(9, 18, 36, .99));
    border-top: 1px solid rgba(110, 195, 182, .2);
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .22s ease, transform .22s ease, visibility .22s ease;
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; pointer-events: auto; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__list a {
    padding: 16px 4px;
    font-size: 17px;
    letter-spacing: .1em;
    border-bottom: 1px solid rgba(110, 195, 182, .12);
    border-radius: 0;
  }
  .site-nav__list a::after { left: 0; right: auto; bottom: 10px; width: 28px; }
  .site-nav__cta { margin-top: 22px; width: 100%; }
  .nav-status { display: block; margin-top: 28px; padding-top: 20px; border-top: 1px dashed rgba(110, 195, 182, .24); }
  .nav-status__title { margin-bottom: 12px; }
}

/* 8 · 页脚 */
.site-footer {
  margin-top: clamp(48px, 8vw, 110px);
  padding-block: clamp(38px, 6vw, 72px) 26px;
  background: linear-gradient(180deg, rgba(27, 58, 107, .55), rgba(11, 22, 42, .96));
  border-top: 1px solid rgba(110, 195, 182, .18);
  color: #B9CDCA;
}
.site-footer__frame { display: block; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: clamp(26px, 3.4vw, 44px); }
@media (min-width: 700px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 1.45fr 1fr 1.35fr 1fr; } }
.footer-col { min-width: 0; }
.footer-title { font-size: 12px; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; color: var(--c-sky); margin-bottom: 16px; }
.footer-list li + li { margin-top: 10px; }
.footer-list a {
  font-size: 14px;
  color: #CBDDD9;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}
.footer-list a:hover, .footer-list a:focus-visible { color: var(--c-gold); border-color: rgba(217, 164, 65, .6); }
.footer-note { font-size: 13px; line-height: 1.8; color: #9FB4B1; max-width: 36ch; margin-top: 14px; }
.footer-note--muted { font-size: 12px; color: var(--c-slate); }
.footer-contact { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; font-size: 13px; line-height: 1.7; color: #B9CDCA; }
.footer-contact__key { font-size: 12px; letter-spacing: .12em; color: var(--c-slate); }
.copy-btn { margin-top: 2px; }
.footer-base {
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: 18px;
  border-top: 1px solid rgba(110, 195, 182, .14);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-slate);
}
.footer-base__icp { color: #8FA5A2; }
.footer-base__note { color: var(--c-slate); }

/* 9 · 面包屑 */
.breadcrumbs { font-size: 12px; letter-spacing: .12em; color: var(--c-slate); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; }
.breadcrumbs a { color: var(--c-sky); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-gold); }
.breadcrumbs li + li::before { content: "/"; margin-right: 8px; color: rgba(110, 195, 182, .45); }

/* 10 · 堆叠面板 */
.panel {
  position: relative;
  border-radius: var(--r-lg);
  padding: clamp(22px, 4vw, 44px);
}
.panel--dark {
  background: linear-gradient(160deg, rgba(27, 58, 107, .88), rgba(16, 31, 60, .92));
  border: 1px solid rgba(110, 195, 182, .16);
  color: var(--c-text);
  box-shadow: var(--shadow-1);
}
.panel--glass {
  background: rgba(27, 58, 107, .42);
  border: 1px solid rgba(110, 195, 182, .24);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--c-text);
}
.panel--mist { background: var(--c-mist); border: 1px solid #CFE3DF; color: #2C3C39; }
.panel--light { background: var(--c-paper); border: 1px solid #D6E5E1; color: #3A4A47; }
.panel--mist h2, .panel--mist h3, .panel--light h2, .panel--light h3 { color: var(--c-ink); }
.panel--mist a, .panel--light a { color: var(--c-teal-deep); }
.panel--light .card { background: #FFFFFF; border-color: #DCE9E6; color: #3A4A47; }

/* 11 · 卡片 */
.card {
  position: relative;
  display: block;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--r-md);
  background: rgba(16, 31, 60, .68);
  border: 1px solid rgba(110, 195, 182, .16);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease, box-shadow .2s ease;
}
.card:hover, .card:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(110, 195, 182, .44);
  background: rgba(27, 58, 107, .74);
  box-shadow: var(--shadow-1);
}
.card__index { display: block; font-size: 12px; font-weight: 600; letter-spacing: .22em; color: var(--c-gold); margin-bottom: 10px; }
.card__title { display: block; font-size: clamp(1.05rem, 1.6vw, 1.3rem); font-weight: 600; color: var(--c-paper); line-height: 1.4; margin-bottom: 8px; }
.card__text { display: block; font-size: 14px; line-height: 1.8; color: #AFC3C0; }
.card__meta { display: block; margin-top: 16px; font-size: 12px; letter-spacing: .12em; color: var(--c-sky); }

/* 12 · 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--c-sky);
}
.tag--gold { color: var(--c-gold); }
.tag--amber { color: var(--c-amber); }
.tag--mute { color: var(--c-slate); }

/* 13 · 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  line-height: 1.4;
  color: var(--c-paper);
  background: none;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: none; }
.btn--gold { background: var(--c-gold); color: #20160A; }
.btn--gold:hover { background: var(--c-amber); }
.btn--teal { background: var(--c-teal); color: var(--c-paper); }
.btn--teal:hover { background: var(--c-teal-deep); }
.btn--ghost { border-color: rgba(110, 195, 182, .45); color: var(--c-sky); }
.btn--ghost:hover { background: rgba(110, 195, 182, .14); color: var(--c-paper); border-color: var(--c-sky); }
.btn--small { padding: 8px 14px; font-size: 12px; letter-spacing: .14em; }

/* 14 · 图文容器（供页面阶段放置图片） */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--grad-route);
  border: 1px solid rgba(110, 195, 182, .2);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(62% 74% at 24% 18%, rgba(110, 195, 182, .34), transparent 62%),
    repeating-linear-gradient(58deg, rgba(247, 250, 248, .07) 0 1px, transparent 1px 22px);
}
.media-frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-caption { margin-top: 10px; font-size: 12px; letter-spacing: .08em; color: var(--c-slate); }

/* 15 · 折叠问答 */
.disclosure {
  border: 1px solid rgba(110, 195, 182, .18);
  border-radius: var(--r-md);
  background: rgba(16, 31, 60, .58);
  overflow: hidden;
}
.disclosure + .disclosure { margin-top: 10px; }
.disclosure__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  background: none;
  border: 0;
  text-align: left;
  color: var(--c-paper);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  cursor: pointer;
  transition: background-color .18s ease;
}
.disclosure__toggle:hover { background: rgba(110, 195, 182, .08); }
.disclosure__icon { flex: 0 0 auto; font-size: 18px; line-height: 1; color: var(--c-gold); transition: transform .22s ease; }
.disclosure[data-open] .disclosure__icon { transform: rotate(45deg); }
.disclosure__panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .24s ease; }
.disclosure[data-open] .disclosure__panel { grid-template-rows: 1fr; }
.disclosure__inner { overflow: hidden; }
.disclosure__body { padding: 0 20px 20px; font-size: 15px; line-height: 1.85; color: #B8CCCA; }

/* 16 · 分类筛选 */
.filter { display: flex; flex-wrap: wrap; gap: 8px; }
.filter__btn {
  padding: 8px 16px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--c-sky);
  background: rgba(110, 195, 182, .08);
  border: 1px solid rgba(110, 195, 182, .25);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.filter__btn:hover { border-color: var(--c-sky); color: var(--c-paper); }
.filter__btn[aria-pressed="true"] { background: var(--c-teal); border-color: var(--c-teal); color: var(--c-paper); }

/* 17 · 滚动显现 */
.has-js [data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
.has-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* 18 · 减少动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .has-js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover, .btn:hover { transform: none; }
}