/* ============================================================
   天天娱乐 · 全站共享样式 /assets/site.css
   深空蓝基底 · 霓虹橙 × 电光青 · 技术蓝图网格
   ============================================================ */

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

html {
  background-color: #0A0F1E;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

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

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

button, input, select, textarea { font: inherit; color: inherit; margin: 0; }
button { background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }
[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  color-scheme: dark;

  --void: #0A0F1E;
  --void-deep: #070B16;
  --ink: #111827;
  --paper: #F5EAD7;
  --paper-ink: #1A1712;
  --neon: #FF6B2C;
  --cyan: #2DE2E6;
  --violet: #6B7280;
  --white: #E8F0FF;
  --alert: #FF4D6D;
  --slate: #1A2A3A;

  --text: #E8F0FF;
  --text-dim: #9FAEC8;
  --text-mute: #6F7C94;

  --line: rgba(45, 226, 230, .16);
  --line-strong: rgba(45, 226, 230, .46);
  --line-soft: rgba(107, 114, 128, .32);
  --grid-line: rgba(45, 226, 230, .055);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --step--1: clamp(.75rem, .72rem + .12vw, .8125rem);
  --step-0: clamp(.9375rem, .9rem + .2vw, 1.0625rem);
  --step-1: clamp(1.0625rem, 1rem + .4vw, 1.3125rem);
  --step-2: clamp(1.375rem, 1.2rem + .9vw, 1.875rem);
  --step-3: clamp(1.75rem, 1.4rem + 1.8vw, 2.6rem);
  --step-4: clamp(2.125rem, 1.4rem + 3.6vw, 4.25rem);

  --shell: 1280px;
  --gutter: clamp(1rem, .45rem + 2.4vw, 2.75rem);

  --cut: 14px;
  --dur: .42s;
  --dur-slow: .7s;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --z-header: 80;
  --z-progress: 120;
}

/* ---------- 3. 基底与蓝图画布 ---------- */
body {
  min-height: 100vh;
  background-color: var(--void);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-color: var(--void);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    radial-gradient(ellipse 80% 55% at 84% -8%, rgba(255, 107, 44, .17), transparent 64%),
    radial-gradient(ellipse 70% 50% at 4% 4%, rgba(45, 226, 230, .13), transparent 62%);
  background-size: 80px 80px, 80px 80px, 100% 100%, 100% 100%;
  background-position: 0 0, 0 0, center, center;
}

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

::selection { background: var(--neon); color: #150A02; }

/* ---------- 4. 排版 ---------- */
.h1, .h2, .h3, .h4 {
  font-weight: 700;
  letter-spacing: .012em;
  color: var(--white);
  line-height: 1.16;
}
.h1 { font-size: var(--step-4); font-weight: 800; line-height: 1.06; letter-spacing: .006em; }
.h2 { font-size: var(--step-3); }
.h3 { font-size: var(--step-2); }
.h4 { font-size: var(--step-1); font-weight: 600; }

.lede {
  font-size: var(--step-1);
  line-height: 1.68;
  color: var(--text-dim);
  max-width: 62ch;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: .9rem;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: .08em;
  font-variant-ligatures: none;
}

.coord {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--text-mute);
}

.blueprint-rule {
  display: block;
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(45, 226, 230, .28) 38%, transparent 100%);
  opacity: .75;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 布局 ---------- */
.shell {
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--shell);
  margin-inline: auto;
}

.main-content { position: relative; }

.section { padding-block: clamp(2.75rem, 7vw, 5.5rem); }
.section--tight { padding-block: clamp(1.5rem, 4vw, 2.75rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: .9rem 2rem;
  margin-bottom: clamp(1.4rem, 3.4vw, 2.6rem);
}
.section-head > * { min-width: 0; }

.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.75rem);
}
.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)); }

/* ---------- 6. 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6em;
  padding: .92em 1.55em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--white);
  background: transparent;
  cursor: pointer;
  border: 0;
  box-shadow: inset 0 0 0 1px var(--line-strong);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--neon);
  color: #170A02;
  box-shadow: inset 0 0 0 1px rgba(255, 107, 44, .5);
}
.btn--primary:hover { background: #FF824E; }

.btn--ghost { color: var(--cyan); }
.btn--ghost:hover { box-shadow: inset 0 0 0 1px var(--cyan); color: var(--white); }

.btn--block { display: flex; width: 100%; }

/* ---------- 7. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  color: var(--text-mute);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
}
.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: .55rem;
  color: var(--line-soft);
}
.breadcrumb a { color: var(--cyan); transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb [aria-current="page"] { color: var(--text-dim); }

/* ---------- 8. 面板 / 卡片 / 标签 ---------- */
.panel {
  position: relative;
  padding: clamp(1.15rem, 3vw, 1.85rem);
  background:
    linear-gradient(158deg, rgba(26, 42, 58, .78) 0%, rgba(17, 24, 39, .88) 100%);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.panel:hover {
  transform: translateY(-3px);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.card-paper {
  position: relative;
  padding: clamp(1.15rem, 3vw, 1.7rem);
  background: var(--paper);
  color: var(--paper-ink);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.card-paper .h1,
.card-paper .h2,
.card-paper .h3,
.card-paper .h4 { color: #16130F; }
.card-paper a { color: #9A3A0C; text-decoration: underline; text-underline-offset: 3px; }
.card-paper .coord,
.card-paper .eyebrow { color: #7A5426; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .36em .78em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  color: var(--cyan);
  background: rgba(45, 226, 230, .07);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.tag--neon {
  color: var(--neon);
  background: rgba(255, 107, 44, .1);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 44, .36);
}
.tag--alert {
  color: var(--alert);
  background: rgba(255, 77, 109, .12);
  box-shadow: inset 0 0 0 1px rgba(255, 77, 109, .4);
}
.tag--muted {
  color: var(--text-mute);
  background: rgba(107, 114, 128, .12);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.tag-btn {
  cursor: pointer;
  border: 0;
  font-family: var(--font-mono);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.tag-btn:hover { color: var(--white); box-shadow: inset 0 0 0 1px var(--line-strong); }
.tag-btn[aria-pressed="true"] {
  color: var(--void-deep);
  background: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

/* ---------- 9. 可展开内容 ---------- */
.disclosure {
  border-bottom: 1px solid var(--line-soft);
}
.disclosure:first-child { border-top: 1px solid var(--line-soft); }

.disclosure-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.05rem 0;
  text-align: left;
  font-family: inherit;
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--white);
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}
.disclosure-trigger:hover { color: var(--cyan); }

.disclosure-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .14em;
  color: var(--cyan);
}

.disclosure-icon {
  position: relative;
  flex: none;
  margin-left: auto;
  width: 14px;
  height: 14px;
  color: currentColor;
}
.disclosure-icon::before,
.disclosure-icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.disclosure-icon::before { top: 50%; left: 0; width: 14px; height: 1.5px; margin-top: -.75px; }
.disclosure-icon::after { left: 50%; top: 0; width: 1.5px; height: 14px; margin-left: -.75px; }
.disclosure-trigger[aria-expanded="true"] .disclosure-icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.disclosure-panel {
  overflow: hidden;
  height: 0;
  transition: height var(--dur) var(--ease);
}
.disclosure-panel-inner {
  padding-bottom: 1.35rem;
  color: var(--text-dim);
  max-width: 74ch;
}

/* ---------- 10. 图片占位容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(140deg, rgba(255, 107, 44, .2) 0%, rgba(45, 226, 230, .16) 52%, rgba(26, 42, 58, .9) 100%);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(10, 15, 30, .22) 0px,
    rgba(10, 15, 30, .22) 1px,
    transparent 1px,
    transparent 4px
  );
  mix-blend-mode: multiply;
  opacity: .6;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  padding: .72em 1.25em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  background: var(--neon);
  color: #170A02;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: top .22s var(--ease);
}
.skip-link:focus { top: 10px; }

/* ---------- 12. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(10, 15, 30, .9);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header[data-condensed] {
  background: rgba(7, 11, 22, .97);
  box-shadow: 0 20px 48px -30px rgba(0, 0, 0, .95);
}

.tier-inner {
  position: relative;
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 56px;
}

.header-tier--brand {
  max-height: 96px;
  overflow: hidden;
  background: linear-gradient(90deg, rgba(17, 24, 39, .88) 0%, rgba(10, 15, 30, .42) 100%);
  border-bottom: 1px solid rgba(107, 114, 128, .18);
  transition: max-height .42s var(--ease), opacity .3s var(--ease);
}
.site-header[data-condensed] .header-tier--brand {
  max-height: 0;
  opacity: 0;
}

.header-tier--nav { position: relative; }
.header-tier--nav .tier-inner { min-height: 54px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .78rem;
  color: inherit;
}
.brand-mark {
  position: relative;
  flex: none;
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--neon) 0%, var(--cyan) 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 70% 100%, 0 100%, 0 30%);
  transition: transform var(--dur) var(--ease);
}
.brand:hover .brand-mark { transform: rotate(-6deg) scale(1.05); }
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  background: var(--void);
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 70% 100%, 0 100%, 0 30%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}
.brand-name {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .07em;
  color: var(--white);
}
.brand-sub {
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  white-space: nowrap;
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: .9rem;
  flex: none;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .34em .8em;
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--cyan);
  background: rgba(45, 226, 230, .07);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.status-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: dotPulse 2.6s var(--ease) infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .3; }
}

.tier-index {
  font-size: .6875rem;
  letter-spacing: .18em;
  color: var(--text-mute);
}

/* 主导航 */
.primary-nav { flex: 1 1 auto; min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(.2rem, 1.1vw, 1.15rem);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .42em;
  padding: .58em .2em;
  font-size: .9375rem;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--text-dim);
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .12em;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--white); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-idx {
  font-size: .625rem;
  letter-spacing: .1em;
  color: var(--text-mute);
  transition: color var(--dur) var(--ease);
}
.nav-link:hover .nav-idx { color: var(--cyan); }

.nav-link[aria-current="page"] { color: var(--white); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--neon);
}
.nav-link[aria-current="page"] .nav-idx { color: var(--neon); }

.nav-aside {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex: none;
  margin-left: 1rem;
}

.word-finder {
  padding: .52em 1em;
  font-size: .6875rem;
  letter-spacing: .14em;
  color: #06181A;
  background: var(--cyan);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.word-finder:hover { background: #5CF1F3; transform: translateY(-1px); }
.word-finder[aria-expanded="true"] { background: var(--neon); color: #170A02; }

/* 移动端汉堡 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 38px;
  flex: none;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: box-shadow var(--dur) var(--ease);
}
.nav-toggle:hover { box-shadow: inset 0 0 0 1px var(--line-strong); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: background-color .3s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform .3s var(--ease), top .3s var(--ease), opacity .2s linear;
}
.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); }

/* 短词定位面板 */
.word-finder-panel {
  background: rgba(17, 24, 39, .96);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.finder-inner {
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--shell);
  margin-inline: auto;
  padding: 1.15rem 0 1.35rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .7rem 1.1rem;
}
.finder-label {
  flex: none;
  font-size: .6875rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.finder-field {
  flex: 1 1 280px;
  min-width: 0;
}
.finder-input {
  width: 100%;
  padding: .72em .95em;
  font-family: var(--font-mono);
  font-size: .875rem;
  letter-spacing: .06em;
  color: var(--white);
  background: rgba(45, 226, 230, .06);
  border: 0;
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.finder-input::placeholder { color: var(--text-mute); }
.finder-input:focus {
  outline: none;
  background: rgba(45, 226, 230, .1);
  box-shadow: inset 0 0 0 1px var(--cyan);
}
.finder-hint {
  flex: 1 1 100%;
  font-size: .8125rem;
  color: var(--text-mute);
}
.finder-tags {
  flex: 1 1 100%;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.finder-tag {
  padding: .4em .9em;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--text-dim);
  background: rgba(107, 114, 128, .12);
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.finder-tag:hover { color: var(--white); box-shadow: inset 0 0 0 1px var(--line-strong); }
.finder-tag[data-match] {
  color: var(--void-deep);
  background: var(--neon);
  box-shadow: inset 0 0 0 1px var(--neon);
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6.5rem);
  background: linear-gradient(180deg, rgba(17, 24, 39, .96) 0%, var(--void-deep) 100%);
  border-top: 1px solid var(--line);
  color: var(--text-dim);
  font-size: .9375rem;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--cyan) 34%, var(--neon) 68%, transparent 100%);
  opacity: .7;
}

.footer-grid {
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(1.5rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: minmax(250px, 1.35fr) minmax(140px, .72fr) minmax(150px, .78fr) minmax(230px, 1.15fr);
  gap: clamp(1.6rem, 4vw, 3rem);
}

.footer-brand { min-width: 0; }
.brand--footer { margin-bottom: 1rem; }
.brand--footer .brand-name { font-size: 1rem; }
.footer-note {
  color: var(--text-dim);
  max-width: 34ch;
  font-size: .9375rem;
}
.footer-stamp {
  margin-top: 1.1rem;
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--text-mute);
}

.footer-col { min-width: 0; }
.footer-heading {
  margin-bottom: 1.05rem;
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-list {
  display: grid;
  gap: .58rem;
}
.footer-list a {
  color: var(--text-dim);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--white);
  padding-left: .4rem;
}

.contact-list {
  display: grid;
  gap: .95rem;
}
.contact-row {
  display: grid;
  grid-template-columns: 3.9rem minmax(0, 1fr);
  gap: .7rem;
  align-items: baseline;
}
.contact-label {
  font-size: .6875rem;
  letter-spacing: .16em;
  color: var(--text-mute);
}
.contact-body {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem .7rem;
  min-width: 0;
}
.contact-value {
  color: var(--text);
  font-size: .8125rem;
  word-break: break-word;
}
.copy-btn {
  flex: none;
  padding: .22em .62em;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--text-mute);
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
  transition: color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}
.copy-btn:hover { color: var(--cyan); box-shadow: inset 0 0 0 1px var(--line-strong); }
.copy-btn[data-copied="true"] {
  color: #170A02;
  background: var(--neon);
  box-shadow: inset 0 0 0 1px var(--neon);
}

.footer-base {
  width: calc(100% - var(--gutter) * 2);
  max-width: var(--shell);
  margin-inline: auto;
  padding: 1.3rem 0 2.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .8rem 1.6rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--text-mute);
}
.footer-copy { margin: 0; }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.3rem;
}
.footer-legal a {
  color: var(--text-dim);
  transition: color var(--dur) var(--ease);
}
.footer-legal a:hover,
.footer-legal a:focus-visible { color: var(--cyan); }

/* ---------- 14. 动效与浮动工具 ---------- */
[data-js="on"] .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
[data-js="on"] .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: var(--z-progress);
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--neon) 100%);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 90;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--cyan);
  background: rgba(26, 42, 58, .92);
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}
.to-top:hover { color: var(--white); box-shadow: inset 0 0 0 1px var(--line-strong); }
.to-top::before {
  content: "";
  width: 12px;
  height: 12px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: translateY(3px) rotate(45deg);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 959px) {
  html { scroll-padding-top: 88px; }

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

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    background: rgba(7, 11, 22, .985);
    box-shadow: inset 0 0 0 1px var(--line), 0 30px 60px -34px rgba(0, 0, 0, .95);
    transition: max-height .42s var(--ease);
  }
  .primary-nav[data-open] {
    max-height: min(72vh, 480px);
    overflow-y: auto;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .6rem var(--gutter) 1.1rem;
  }
  .nav-link {
    justify-content: flex-start;
    padding: .9rem 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--line-soft);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); }
  .nav-link[aria-current="page"]::before {
    content: "";
    width: 3px;
    height: 1em;
    margin-right: .1rem;
    background: var(--neon);
    flex: none;
  }
  .nav-idx { font-size: .6875rem; }
}

@media (max-width: 720px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }

  .section-head { align-items: flex-start; }

  .finder-inner { padding: 1rem 0 1.2rem; }
  .finder-hint { font-size: .78rem; }
}

@media (max-width: 560px) {
  .tier-index { display: none; }
  .brand-name { font-size: 1rem; }
  .brand-sub { font-size: .625rem; letter-spacing: .12em; }
  .status-chip { padding: .28em .6em; font-size: .625rem; }
  .word-finder { padding: .46em .8em; font-size: .625rem; }
  .contact-row { grid-template-columns: minmax(0, 1fr); gap: .25rem; }
  .footer-legal { gap: .8rem; }
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  [data-js="on"] .reveal { opacity: 1; transform: none; }
  .panel:hover { transform: none; }
  .btn:hover { transform: none; }
  .word-finder:hover { transform: none; }
  .brand:hover .brand-mark { transform: none; }
  .status-dot { animation: none; }
}