/* ===== 6体育M6中国官网 · Site Kit =====
   设计框架：体育数据仪表盘 × 展览画册
   色彩节奏：米白画册留白 / 岩灰第二层级 / 陶土章节色块 /
   竞技红(7) + 电光蓝(3) 数据强调 / 苔绿状态点 / 荧光绿交互高亮 */

/* ---------- 1. Reset 与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 120px;
  scroll-behavior: smooth;
}
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
@media (max-width: 639px) { body { font-size: 0.95rem; } }
img, picture, video, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { color: var(--color-volt); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, h3, h4 { font-weight: 900; letter-spacing: -0.02em; line-height: 1.2; }
[hidden] { display: none !important; }
::selection { background: var(--color-neon); color: var(--color-ink); }
:focus-visible, a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-neon);
  outline-offset: 3px;
  border-radius: 6px;
}

:root {
  --color-canvas: #F4EFE8;
  --color-rock: #8A867F;
  --color-ink: #2F2C29;
  --color-moss: #6B7C67;
  --color-clay: #B8563E;
  --color-arena: #E63125;
  --color-volt: #0062FF;
  --color-neon: #C8FF00;
  --color-sand: #D8A241;
  --glass-bg: rgba(244, 239, 232, 0.82);
  --line: rgba(138, 134, 127, 0.4);
  --line-light: rgba(138, 134, 127, 0.22);
  --shadow-card: 0 10px 30px rgba(47, 44, 41, 0.08);
  --radius: 12px;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans SC', sans-serif;
  --font-num: 'Rajdhani', 'DIN Alternate', 'Bahnschrift', 'Arial Narrow', sans-serif;
  --fs-display: clamp(2rem, 6vw, 5rem);
  --fs-title: clamp(1.5rem, 3.2vw, 2.5rem);
  --fs-lead: clamp(1rem, 1.6vw, 1.2rem);
  --content-max: 76rem;
}

:focus-visible { outline: 2px solid var(--color-neon); outline-offset: 3px; border-radius: 6px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}

/* ---------- 2. 全局布局 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}
.section { padding-block: clamp(3rem, 8vw, 6.5rem); }
.site-main { flex: 1 0 auto; }

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}
.section-index {
  font-family: var(--font-num);
  font-weight: 300;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 0.85;
  letter-spacing: -0.02em;
  color: rgba(138, 134, 127, 0.5);
}
.section-title { font-size: var(--fs-title); font-weight: 900; letter-spacing: -0.02em; line-height: 1.15; }
.section-desc { max-width: 56ch; margin-top: 0.6rem; color: rgba(47, 44, 41, 0.74); font-size: var(--fs-lead); }
.lead { font-size: var(--fs-lead); color: rgba(47, 44, 41, 0.78); }
.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.2em; }
.prose h2 { font-size: 1.5rem; margin: 1.8em 0 0.7em; }
.prose ul { margin-bottom: 1.2em; }
.prose ul li { position: relative; padding-left: 1.2em; margin-bottom: 0.5em; }
.prose ul li::before { content: '▸'; position: absolute; left: 0; color: var(--color-arena); }

.page-hero {
  position: relative;
  padding-block: clamp(2.5rem, 7vw, 5.5rem) clamp(1.5rem, 4vw, 3rem);
}
.page-hero-title { font-size: var(--fs-display); font-weight: 900; letter-spacing: -0.03em; line-height: 1.05; max-width: 18ch; }
.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: rgba(47, 44, 41, 0.62);
}

.grid { display: grid; gap: 1.25rem; }
@media (min-width: 640px) { .grid--2, .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) {
  .grid--2 { grid-template-columns: 1fr 1fr; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- 3. 形态工具 ---------- */
.clip-cut { clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px)); }
.tilt-left { transform: rotate(-1.3deg); }
.tilt-right { transform: rotate(1.3deg); }
.track-bg { background-image: repeating-linear-gradient(-45deg, rgba(138, 134, 127, 0.09) 0 14px, transparent 14px 28px); }
.title-ghost {
  font-size: var(--fs-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(138, 134, 127, 0.55);
}

/* ---------- 4. 头部 ---------- */
.skip-link {
  position: fixed;
  top: -3rem;
  left: 1rem;
  z-index: 200;
  background: var(--color-ink);
  color: var(--color-canvas);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; color: var(--color-canvas); }

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 160;
  background: var(--color-neon);
  transform: scaleX(0);
  transform-origin: 0 50%;
  box-shadow: 0 0 14px rgba(200, 255, 0, 0.7);
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-light);
}
.header-track {
  height: 4px;
  background: linear-gradient(90deg, var(--color-arena) 0 34%, var(--color-volt) 34% 72%, rgba(200, 255, 0, 0.65) 72% 100%);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.7rem;
}

.brand-lockup { display: inline-flex; flex-direction: column; gap: 0.12rem; text-decoration: none; line-height: 1.1; }
.brand-mark { display: flex; align-items: baseline; gap: 0.3rem; font-size: 1.35rem; font-weight: 900; letter-spacing: -0.03em; color: var(--color-ink); }
.brand-mark-main { color: var(--color-arena); }
.brand-mark-sub { font-size: 0.95em; }
.brand-product {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(47, 44, 41, 0.72);
  padding-left: 0.45rem;
  border-left: 3px solid var(--color-arena);
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  padding: 0.32rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-ink);
  border: 1px solid rgba(107, 124, 103, 0.4);
  border-radius: 999px;
  background: rgba(107, 124, 103, 0.1);
  white-space: nowrap;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-moss);
  box-shadow: 0 0 0 0 rgba(107, 124, 103, 0.5);
  animation: statusPulse 2.4s ease-out infinite;
}
@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(107, 124, 103, 0.45); }
  70% { box-shadow: 0 0 0 6px rgba(107, 124, 103, 0); }
  100% { box-shadow: 0 0 0 0 rgba(107, 124, 103, 0); }
}
.status-num { font-family: var(--font-num); font-weight: 700; color: var(--color-volt); font-size: 1.08em; margin-inline: 0.05em; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.7rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ink);
}
.nav-toggle-label { line-height: 1.2; }
.nav-toggle-box { display: inline-flex; flex-direction: column; justify-content: center; gap: 3px; width: 18px; }
.nav-toggle-box span { display: block; height: 2px; border-radius: 2px; background: var(--color-ink); transition: transform 0.25s ease, opacity 0.25s ease; }
.nav-toggle[data-open] .nav-toggle-box span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[data-open] .nav-toggle-box span:nth-child(2) { opacity: 0; }
.nav-toggle[data-open] .nav-toggle-box span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.header-command {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.45s ease, opacity 0.25s ease;
}
.header-command[data-open] {
  max-height: 640px;
  opacity: 1;
  border-top: 1px solid var(--line-light);
}
.site-nav { padding-block: 0.35rem; }
.nav-list { display: flex; flex-direction: column; }
.nav-item { margin: 0; }
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.68rem 0.15rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-light);
}
.nav-link:hover { color: var(--color-volt); }
.nav-idx {
  font-family: var(--font-num);
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.4;
  padding: 0 0.28rem;
  color: var(--color-arena);
  background: rgba(230, 49, 37, 0.08);
  border-radius: 6px;
}
.nav-link[aria-current="page"] { font-weight: 800; }
.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0.1rem;
  bottom: 0.28rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-neon);
  box-shadow: 0 0 10px rgba(200, 255, 0, 0.85);
}

.header-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding-block: 0.8rem;
}
.quick-label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; color: var(--color-rock); }
.quick-link {
  padding: 0.28rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid rgba(0, 98, 255, 0.35);
  border-radius: 999px;
  color: var(--color-volt);
  background: rgba(0, 98, 255, 0.05);
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.quick-link--arena { border-color: rgba(230, 49, 37, 0.4); color: var(--color-arena); background: rgba(230, 49, 37, 0.06); }
.quick-link:hover { background: var(--color-volt); color: #fff; box-shadow: 0 6px 16px rgba(0, 98, 255, 0.25); transform: translateY(-1px); }
.quick-link--arena:hover { background: var(--color-arena); box-shadow: 0 6px 16px rgba(230, 49, 37, 0.26); }

@media (min-width: 1024px) {
  .header-bar { padding-block: 1rem 0.66rem; }
  .nav-toggle { display: none; }
  .header-command {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.75rem;
    max-height: none;
    overflow: visible;
    opacity: 1;
    padding-block: 0.45rem 0.55rem;
  }
  .site-nav { flex: 0 1 auto; margin-right: auto; padding-block: 0; }
  .nav-list { flex-direction: row; gap: 0 1.9rem; }
  .nav-link { padding: 0.45rem 0; font-size: 0.9rem; border-bottom: none; }
  .nav-link[aria-current="page"]::after { left: 50%; transform: translateX(-50%); bottom: 0.1rem; }
  .header-quick { padding-block: 0; }
}
@media (min-width: 1024px) and (max-width: 1179px) {
  .nav-list { gap: 0 1.1rem; }
  .quick-link { padding: 0.24rem 0.45rem; font-size: 0.72rem; }
}
@media (max-width: 479px) {
  .header-status { padding: 0.3rem; }
  .status-text { display: none; }
}

/* ---------- 5. 页脚 ---------- */
.site-footer { margin-top: auto; background: var(--color-ink); color: rgba(244, 239, 232, 0.86); }
.footer-strip { height: 4px; background: linear-gradient(90deg, var(--color-volt) 0 30%, var(--color-arena) 30% 78%, rgba(200, 255, 0, 0.7) 78% 100%); }
.footer-shell { padding-block: clamp(2.5rem, 7vw, 4.5rem) 1.4rem; }
.footer-grid { display: grid; gap: 2.2rem 2.5rem; grid-template-columns: 1fr; }
.footer-brand-mark { font-size: 1.8rem; font-weight: 900; letter-spacing: -0.02em; color: var(--color-canvas); line-height: 1.1; }
.footer-brand-accent { color: var(--color-arena); }
.footer-product { margin-top: 0.3rem; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.16em; color: rgba(244, 239, 232, 0.55); }
.footer-service { max-width: 34ch; margin-top: 1rem; font-size: 0.875rem; line-height: 1.7; color: rgba(244, 239, 232, 0.75); }
.footer-h {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.9rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: rgba(244, 239, 232, 0.9);
}
.footer-h::before { content: ''; width: 16px; height: 2px; background: var(--color-arena); }
.footer-list { display: grid; gap: 0.45rem; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: rgba(244, 239, 232, 0.78);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-link::before { content: '▸'; font-size: 0.7rem; color: var(--color-volt); }
.footer-link:hover { color: var(--color-neon); transform: translateX(2px); }
.footer-contact-line { margin-bottom: 0.4rem; font-size: 0.875rem; color: rgba(244, 239, 232, 0.85); }
.footer-mail, .footer-phone { font-family: var(--font-num); font-weight: 600; letter-spacing: 0.02em; }
.footer-address { font-size: 0.82rem; line-height: 1.6; color: rgba(244, 239, 232, 0.6); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.75rem;
  margin-top: 2.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(244, 239, 232, 0.16);
  font-size: 0.75rem;
  color: rgba(244, 239, 232, 0.62);
}
.footer-note { flex-basis: 100%; line-height: 1.6; }
@media (min-width: 680px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1.4fr; }
  .footer-brand { grid-column: auto; }
}

/* ---------- 6. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn--arena { background: var(--color-arena); color: #fff; }
.btn--volt { background: var(--color-volt); color: #fff; }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--color-ink); }
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(230, 49, 37, 0.25); }
.btn--volt:hover { box-shadow: 0 10px 22px rgba(0, 98, 255, 0.28); }
.btn--ghost:hover { box-shadow: var(--shadow-card); }

.card {
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(244, 239, 232, 0.72);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.card:hover {
  border-color: rgba(200, 255, 0, 0.85);
  box-shadow: 0 0 0 1px rgba(200, 255, 0, 0.55), var(--shadow-card);
  transform: translateY(-3px);
}
.card--glass { background: var(--glass-bg); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.card--clay { background: var(--color-clay); border-color: transparent; color: var(--color-canvas); }
.card--clay a { color: var(--color-canvas); }
.card--rock { background: var(--color-rock); border-color: transparent; color: rgba(244, 239, 232, 0.92); }
.card--arena { background: var(--color-arena); border-color: transparent; color: #fff; }
.card--volt { background: var(--color-volt); border-color: transparent; color: #fff; }
.card-title { margin-bottom: 0.45rem; font-size: 1.15rem; font-weight: 800; }
.card-text { font-size: 0.9rem; opacity: 0.82; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.8rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-ink);
  background: rgba(244, 239, 232, 0.8);
}
.tag--red { border-color: rgba(230, 49, 37, 0.5); color: var(--color-arena); background: rgba(230, 49, 37, 0.08); }
.tag--yellow { border-color: rgba(216, 162, 65, 0.55); color: #8A5E0E; background: rgba(216, 162, 65, 0.12); }
.tag--moss { border-color: rgba(107, 124, 103, 0.5); color: #4C5A49; background: rgba(107, 124, 103, 0.12); }
.tag--volt { border-color: rgba(0, 98, 255, 0.45); color: var(--color-volt); background: rgba(0, 98, 255, 0.06); }
.tag--num { font-family: var(--font-num); font-weight: 700; }

.stat { display: grid; gap: 0.25rem; }
.stat-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--color-arena);
}
.stat--volt .stat-num { color: var(--color-volt); }
.stat--clay .stat-num { color: var(--color-clay); }
.stat--light .stat-num { color: var(--color-canvas); }
.stat-label { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.06em; color: rgba(47, 44, 41, 0.65); }
.stat--light .stat-label { color: rgba(244, 239, 232, 0.75); }

.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--color-rock);
}
.media-frame::before {
  content: 'M6 赛场视觉区';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(-45deg, rgba(47, 44, 41, 0.22) 0 14px, rgba(47, 44, 41, 0.06) 14px 28px);
  color: rgba(244, 239, 232, 0.78);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-align: center;
}
.media-frame[data-label]::before { content: attr(data-label); }
.media-frame img, .media-frame video, .media-frame picture {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--hero { aspect-ratio: 4 / 3; }
@media (min-width: 1024px) { .media-frame--hero { aspect-ratio: 16 / 9; } }
.media-caption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: rgba(47, 44, 41, 0.6);
}
.media-index { font-family: var(--font-num); font-weight: 700; color: var(--color-arena); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-block: 0.9rem;
  font-size: 0.8rem;
}
.breadcrumbs a { font-weight: 500; text-decoration: none; color: var(--color-volt); }
.breadcrumbs li + li::before { content: '/'; margin-right: 0.4rem; color: var(--color-rock); }
.breadcrumbs [aria-current="page"] { color: var(--color-ink); font-weight: 700; }

.index-list { display: grid; gap: 0.35rem; }
.index-list a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.2rem;
  border-bottom: 1px dashed var(--line-light);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-ink);
}
.index-list a:hover { color: var(--color-arena); }
.index-list .index-num { font-family: var(--font-num); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.06em; color: var(--color-rock); }
.index-list a:hover .index-num { color: var(--color-arena); }
@media (min-width: 640px) { .index-list--cols { grid-template-columns: 1fr 1fr; column-gap: 2rem; } }

.filter-row { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-bottom: 1.5rem; }
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(244, 239, 232, 0.8);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-ink);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.filter-btn:hover { border-color: rgba(200, 255, 0, 0.9); }
.filter-btn[aria-pressed="true"], .filter-btn.is-active {
  border-color: var(--color-ink);
  background: var(--color-ink);
  color: var(--color-canvas);
  box-shadow: 0 0 0 3px rgba(200, 255, 0, 0.55);
}

/* ---------- 7. 显现动效 ---------- */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 0.65s ease, transform 0.65s ease; }
[data-reveal].is-revealed { opacity: 1; transform: none; }
[data-reveal][data-reveal-d="1"] { transition-delay: 0.1s; }
[data-reveal][data-reveal-d="2"] { transition-delay: 0.2s; }
[data-reveal][data-reveal-d="3"] { transition-delay: 0.3s; }