/* ==========================================================================
   乐鱼移动版 · 共享站点样式 /assets/site.css
   水域入口 · 侧边品牌轨道 · 框架式导航
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ink: #061A26;
  --teal: #083A3F;
  --aqua: #19C3D0;
  --aqua-soft: #8DECE7;
  --coral: #FF6A4D;
  --indigo: #4B3F8F;
  --wine: #7B2E45;
  --mist: #F4FBFB;
  --slate: #AFC5CB;
  --abyss: #020B10;

  --line: rgba(141, 236, 231, 0.18);
  --line-strong: rgba(141, 236, 231, 0.34);
  --line-faint: rgba(141, 236, 231, 0.10);

  --rail-w: clamp(228px, 19vw, 268px);
  --radius: 18px;
  --radius-sm: 12px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  --shell-max: 1240px;

  --font-head: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

[hidden] { display: none !important; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--mist);
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(141, 236, 231, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 236, 231, 0.045) 1px, transparent 1px),
    radial-gradient(1200px 620px at 82% -8%, rgba(25, 195, 208, 0.16), transparent 62%),
    radial-gradient(900px 540px at -10% 108%, rgba(75, 63, 143, 0.24), transparent 66%);
  background-size: 72px 72px, 72px 72px, auto, auto;
  background-attachment: fixed, fixed, fixed, fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img { height: auto; }

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

:focus-visible {
  outline: 2px solid var(--aqua-soft);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.55em;
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.05em;
  text-wrap: balance;
  color: var(--mist);
}

h1 {
  font-size: clamp(2rem, 5.2vw, 4.5rem);
  letter-spacing: 0.04em;
}

h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.55rem); }
h4 { font-size: clamp(1rem, 1.5vw, 1.18rem); letter-spacing: 0.06em; }

p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--aqua);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}

a:hover { color: var(--aqua-soft); }

strong { font-weight: 700; color: var(--mist); }

small { font-size: 0.82em; color: var(--slate); }

ul, ol { margin: 0 0 1.05em; padding-left: 1.25em; }
li { margin-bottom: 0.35em; }

hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: clamp(1.5rem, 4vw, 2.5rem) 0;
}

code, .mono, kbd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: 820px; }

.section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--aqua);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--coral);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.65rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(25, 195, 208, 0.10);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--aqua-soft);
  white-space: nowrap;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.45rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background-color 0.2s var(--ease),
              border-color 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

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

.btn--coral {
  background: var(--coral);
  color: #2A0A04;
  box-shadow: 0 10px 24px -10px rgba(255, 106, 77, 0.65);
}

.btn--coral:hover,
.btn--coral:focus-visible {
  background: #FF8368;
  color: #2A0A04;
  transform: translateY(-2px);
}

.btn--aqua {
  background: var(--aqua);
  color: #02262B;
  box-shadow: 0 10px 24px -12px rgba(25, 195, 208, 0.8);
}

.btn--aqua:hover,
.btn--aqua:focus-visible {
  background: var(--aqua-soft);
  color: var(--ink);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--mist);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(25, 195, 208, 0.14);
  border-color: var(--aqua);
  color: var(--mist);
}

.btn--sm {
  padding: 0.55rem 1rem;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 300;
  display: inline-block;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  background: var(--aqua-soft);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.24s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--ink);
}

/* ---------- 7. 头部：移动端顶部条 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.8rem var(--gutter);
  background: linear-gradient(180deg, rgba(8, 58, 63, 0.97), rgba(6, 26, 38, 0.97));
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
}

/* 品牌块 */
.brand {
  display: inline-flex;
  align-items: flex-start;
  gap: 0.7rem;
  color: var(--mist);
  text-decoration: none;
}

.brand:hover { color: var(--mist); }

.brand-mark {
  position: relative;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--aqua) 0%, #0B6270 68%, var(--teal) 100%);
  box-shadow: 0 8px 20px -10px rgba(25, 195, 208, 0.9),
              inset 0 0 0 1px rgba(244, 251, 251, 0.28);
  overflow: hidden;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 11px 8px auto 8px;
  height: 2px;
  border-radius: 2px;
  background: rgba(244, 251, 251, 0.92);
  transform: skewX(-16deg);
  box-shadow:
    0 6px 0 rgba(244, 251, 251, 0.56),
    0 12px 0 rgba(244, 251, 251, 0.30);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -10px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 77, 0.9), transparent 68%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.brand-text__name {
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--mist);
}

.brand-text__sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  line-height: 1.3;
  color: var(--slate);
}

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex: none;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(25, 195, 208, 0.10);
  color: var(--mist);
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-toggle:hover { background: rgba(25, 195, 208, 0.2); border-color: var(--aqua); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.site-header[data-open] .nav-toggle__bars::before { transform: translateY(4px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-4px) rotate(-45deg); }

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

/* 导航：移动端为下拉抽屉 */
.primary-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 0.9rem;
}

.site-header[data-open] .primary-nav {
  display: flex;
  animation: navReveal 0.28s var(--ease) both;
}

@keyframes navReveal {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.primary-nav__list {
  counter-reset: navidx;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.primary-nav__item { margin: 0; }

.primary-nav__link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.85rem;
  border-inline-start: 2px solid transparent;
  border-radius: 8px;
  color: var(--slate);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease),
              border-color 0.2s var(--ease);
}

.primary-nav__link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  flex: none;
  min-width: 1.7em;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--aqua);
  opacity: 0.75;
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--mist);
  background: rgba(25, 195, 208, 0.12);
  border-inline-start-color: var(--aqua);
}

.primary-nav__link[aria-current="page"] {
  background: var(--aqua-soft);
  border-inline-start-color: var(--coral);
  color: var(--ink);
  font-weight: 700;
}

.primary-nav__link[aria-current="page"]::before {
  color: var(--ink);
  opacity: 1;
}

.rail-actions {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.2rem;
}

.rail-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--slate);
  opacity: 0.85;
}

/* ---------- 8. 头部：桌面端左侧品牌轨道 ---------- */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }

  .site-header {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--rail-w);
    flex-wrap: nowrap;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 1rem;
    padding: clamp(1.5rem, 3.2vh, 2.25rem) 1.35rem 1.35rem;
    border-bottom: 0;
    border-inline-end: 1px solid var(--line);
    background:
      radial-gradient(420px 260px at 0% 0%, rgba(25, 195, 208, 0.20), transparent 70%),
      linear-gradient(180deg, #083A3F 0%, #061A26 55%, #020B10 100%);
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    scrollbar-width: thin;
  }

  .header-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .nav-toggle { display: none; }

  .primary-nav {
    display: flex;
    flex: 1;
    width: 100%;
    margin-top: clamp(1.6rem, 4vh, 2.5rem);
    animation: none;
  }

  .site-header[data-open] .primary-nav { animation: none; }

  .primary-nav__link {
    padding: 0.62rem 0.7rem;
    font-size: 0.92rem;
  }

  .rail-actions {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--line-faint);
  }

  .rail-note { margin-top: 0.9rem; }
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 5.5rem);
  padding: clamp(2.5rem, 5vw, 4rem) 0 1.4rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(2, 11, 16, 0) 0%, #020B10 26%, #020B10 100%);
  color: var(--slate);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--aqua), transparent);
  opacity: 0.65;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 720px) {
  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .footer-inner { grid-template-columns: 1.5fr 0.9fr 0.9fr 1.3fr; }
}

.footer-brand { min-width: 0; }

.brand--footer {
  display: inline-flex;
  margin-bottom: 1rem;
}

.footer-desc {
  margin: 0 0 0.7rem;
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--mist);
}

.footer-note {
  margin: 0;
  max-width: 36ch;
  font-size: 0.8rem;
  line-height: 1.7;
  color: rgba(175, 197, 203, 0.8);
}

.footer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--aqua-soft);
}

.footer-title::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--coral);
}

.footer-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-list li { margin: 0; }

.footer-list a {
  position: relative;
  display: inline-block;
  padding-block: 0.15rem;
  color: var(--mist);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.footer-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--aqua);
  transition: width 0.26s var(--ease);
}

.footer-list a:hover,
.footer-list a:focus-visible { color: var(--aqua-soft); }

.footer-list a:hover::after,
.footer-list a:focus-visible::after { width: 100%; }

.footer-contact { min-width: 0; }

.footer-contact__list {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-contact__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(8, 58, 63, 0.42);
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--aqua);
}

.footer-contact__value {
  min-width: 0;
  font-size: 0.86rem;
  line-height: 1.45;
  color: var(--mist);
  word-break: break-word;
}

.copy-btn {
  flex: none;
  padding: 0.24rem 0.62rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--aqua-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease);
}

.copy-btn:hover {
  background: rgba(25, 195, 208, 0.18);
  border-color: var(--aqua);
  color: var(--mist);
}

.copy-btn[data-copied] {
  background: var(--aqua);
  border-color: var(--aqua);
  color: var(--abyss);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  width: 100%;
  max-width: var(--shell-max);
  margin: clamp(2rem, 4vw, 2.75rem) auto 0;
  padding: 1.25rem var(--gutter) 0;
  border-top: 1px solid var(--line-faint);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(175, 197, 203, 0.82);
}

.footer-base p { margin: 0; }
.footer-base__copy { color: var(--slate); }
.footer-base__icp { color: rgba(175, 197, 203, 0.68); }
.footer-base__domain { color: rgba(141, 236, 231, 0.72); }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(175, 197, 203, 0.85);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li { margin: 0; }

.breadcrumb a {
  color: var(--aqua);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--aqua-soft);
  text-decoration: underline;
}

.breadcrumb__sep {
  color: rgba(175, 197, 203, 0.45);
}

.breadcrumb li[aria-current="page"] { color: var(--mist); }

/* ---------- 11. 面板 ---------- */
.panel {
  position: relative;
  overflow: hidden;
  padding: clamp(1.1rem, 3vw, 1.75rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(140% 120% at 100% 0%, rgba(25, 195, 208, 0.14), transparent 58%),
    linear-gradient(160deg, rgba(8, 58, 63, 0.78), rgba(6, 26, 38, 0.82));
  box-shadow: 0 24px 48px -34px rgba(2, 11, 16, 0.95);
}

.panel--light {
  background: var(--mist);
  border-color: rgba(6, 26, 38, 0.1);
  color: var(--ink);
  box-shadow: 0 24px 48px -34px rgba(2, 11, 16, 0.45);
}

.panel--light h2,
.panel--light h3,
.panel--light h4,
.panel--light strong { color: var(--ink); }

.panel--light a { color: #0B6270; }
.panel--light a:hover { color: var(--wine); }

/* ---------- 12. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 18% 0%, rgba(25, 195, 208, 0.24), transparent 56%),
    linear-gradient(160deg, #083A3F, #061A26 70%, #020B10);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

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

.media__scrim {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(2, 11, 16, 0) 42%, rgba(2, 11, 16, 0.76) 100%);
}

/* ---------- 13. 主题筛选组件 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  width: fit-content;
  max-width: 100%;
  padding: 0.45rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(8, 58, 63, 0.55);
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease);
}

.filter-btn:hover {
  background: rgba(25, 195, 208, 0.14);
  color: var(--mist);
}

.filter-btn[aria-pressed="true"] {
  background: var(--coral);
  border-color: var(--coral);
  color: #2A0A04;
  font-weight: 700;
}

.filter-empty {
  margin-top: 1rem;
  padding: 1rem 1.15rem;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: rgba(8, 58, 63, 0.35);
  color: var(--slate);
  font-size: 0.92rem;
}

[data-filter-item][hidden] { display: none !important; }

/* ---------- 14. 动效与无障碍降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .btn--coral:hover,
  .btn--aqua:hover { transform: none; }
}

/* ---------- 15. 平板与移动细节 ---------- */
@media (max-width: 1023px) {
  .site-header { box-shadow: 0 18px 32px -28px rgba(2, 11, 16, 0.95); }

  .brand-text__sub { font-size: 0.64rem; letter-spacing: 0.1em; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }

  .brand-mark { width: 36px; height: 36px; border-radius: 10px; }

  .brand-text__name { font-size: 0.95rem; }

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

  .footer-contact__item .copy-btn {
    grid-column: 2;
    justify-self: start;
  }

  .footer-base { font-size: 0.68rem; letter-spacing: 0.06em; }
}