/* ==========================================================================
   6686中心 · 共享站点样式 /assets/site.css
   ========================================================================== */

*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

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

ul, ol { list-style: none; }

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

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

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

:root {
  --ink: #0A1A2B;
  --ink-panel: #102538;
  --ink-deep: #08141F;
  --line: #1E3A50;
  --line-soft: rgba(30, 58, 80, 0.6);
  --paper: #F3EEE4;
  --text: #E9F0F6;
  --muted: #9AAFC2;
  --muted-deep: #4C6070;
  --orange: #FF6A2B;
  --orange-soft: #FFB185;
  --cyan: #2FE0C0;
  --cyan-soft: #A8F6E7;
  --blocked: #E5482F;

  --font-display: "Oswald", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --max: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 2px;
  --shadow-paper: 0 22px 44px -26px rgba(0, 0, 0, 0.92);
  --ease: cubic-bezier(0.4, 0.1, 0.2, 1);
}

body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 88% -8%, rgba(47, 224, 192, 0.10), transparent 68%),
    radial-gradient(900px 520px at -6% 2%, rgba(255, 106, 43, 0.09), transparent 66%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.06em;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 5.2vw, 4.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 1.7vw, 1.375rem); letter-spacing: 0.04em; letter-spacing: 0.05em; }

p { margin: 0; }

strong { font-weight: 700; }

:::selection { background: rgba(47, 224, 192, 0.28); }

:focus-visible {
  outline: 2px solid var(--cyan-soft);
  outline-offset: 3px;
  border-radius: 1px;
}

[id] { scroll-margin-top: 110px; }

/* ---------- 通用工具 ---------- */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(38px, 6vw, 78px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.2;
  letter-spacing: 0.18em;
  color: var(--orange);
  border: 1px solid rgba(255, 106, 43, 0.42);
  background: rgba(255, 106, 43, 0.08);
  padding: 3px 9px;
  border-radius: var(--radius);
}

.section-title { color: var(--text); }

.section-note {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--cyan);
  flex: none;
}

.mono { font-family: var(--font-mono); letter-spacing: 0.03em; }
.muted { color: var(--muted); }
.text-cyan { color: var(--cyan-soft); }
.text-orange { color: var(--orange); }

.stack > * + * { margin-top: var(--stack-gap, 14px); }

/* ---------- 跳过导航 ---------- */

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  transform: translateY(-180%);
  background: var(--paper);
  color: var(--ink);
  padding: 10px 16px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow-paper);
  transition: transform 0.16s var(--ease);
}

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

/* ---------- 头部 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 26, 43, 0.95);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--orange) 0 26%,
    var(--ink-deep) 26% 32%,
    var(--cyan) 32% 62%,
    var(--ink-deep) 62% 68%,
    var(--orange) 68% 100%);
}

.header-shell {
  position: relative;
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 15px var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  line-height: 1;
  flex: none;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 23px);
  letter-spacing: 0.14em;
  color: var(--text);
}

.brand-sub {
  margin-top: 7px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.36em;
  color: var(--muted);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  border: 1px solid rgba(47, 224, 192, 0.38);
  background: rgba(47, 224, 192, 0.08);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.4;
  border-radius: var(--radius);
  white-space: nowrap;
}

.status-chip--footer { border-color: rgba(47, 224, 192, 0.3); }

.status-text { display: inline-block; }

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: none;
  animation: status-breathe 2.4s ease-in-out infinite;
}

.status-dot--cyan {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 224, 192, 0.16);
}

.status-dot--orange {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.18);
  animation-duration: 1.6s;
}

@keyframes status-breathe {
  0%, 100% { opacity: 0.42; transform: scale(0.84); }
  50% { opacity: 1; transform: scale(1); }
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  flex-wrap: wrap;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 15px;
  color: var(--muted);
  letter-spacing: 0.04em;
  transition: color 0.16s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--text); }

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--cyan-soft); }

.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-alert {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--orange);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  border-radius: var(--radius);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
  white-space: nowrap;
}

.nav-alert::after { content: "→"; }

.nav-alert:hover,
.nav-alert:focus-visible {
  background: var(--orange);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  background: rgba(255, 255, 255, 0.03);
}

.nav-toggle.is-active { border-color: rgba(47, 224, 192, 0.5); color: var(--cyan-soft); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  flex: none;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform 0.18s var(--ease);
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle.is-active .nav-toggle-bars { background: transparent; }
.nav-toggle.is-active .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-active .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  transition: background 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.btn::after { content: "→"; }

.btn:hover,
.btn:focus-visible { border-color: rgba(47, 224, 192, 0.55); color: var(--cyan-soft); }

.btn--cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #062018;
  font-weight: 700;
}

.btn--cyan:hover,
.btn--cyan:focus-visible {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
  color: #062018;
}

.btn--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: #200A02;
  font-weight: 700;
}

.btn--orange:hover,
.btn--orange:focus-visible {
  background: var(--orange-soft);
  border-color: var(--orange-soft);
  color: #200A02;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(47, 224, 192, 0.5);
  color: var(--cyan-soft);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(47, 224, 192, 0.1);
  color: var(--cyan-soft);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan-soft);
  border-bottom: 1px solid rgba(47, 224, 192, 0.45);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.link-arrow::after { content: "→"; font-size: 0.9em; }

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 面板与卡片 ---------- */

.panel {
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(16px, 2.4vw, 26px);
}

.paper-card {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(10, 26, 43, 0.16);
  border-radius: var(--radius);
  padding: clamp(16px, 2.4vw, 26px);
  box-shadow: var(--shadow-paper);
}

.paper-card--tilt-l { transform: rotate(-1.2deg); }
.paper-card--tilt-r { transform: rotate(1.2deg); }

.paper-card h2,
.paper-card h3,
.paper-card h4 { color: var(--ink); }

.paper-card p { color: #1B2C3C; }
.paper-card .muted { color: var(--muted-deep); }
.paper-card .mono { color: #16324A; }

/* ---------- 标签 ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--cyan {
  color: var(--cyan-soft);
  border-color: rgba(47, 224, 192, 0.45);
  background: rgba(47, 224, 192, 0.09);
}

.tag--orange {
  color: var(--orange-soft);
  border-color: rgba(255, 106, 43, 0.45);
  background: rgba(255, 106, 43, 0.09);
}

.tag--blocked {
  color: #FFF4F0;
  border-color: var(--blocked);
  background: var(--blocked);
}

/* ---------- 图片容器 ---------- */

.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  background-color: var(--ink-panel);
  background-image:
    linear-gradient(135deg, rgba(47, 224, 192, 0.16) 0%, rgba(10, 26, 43, 0.92) 46%, rgba(255, 106, 43, 0.16) 100%),
    repeating-linear-gradient(90deg, rgba(233, 240, 246, 0.05) 0 1px, transparent 1px 42px);
}

.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--21x9 { aspect-ratio: 21 / 9; }

.media__slot {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(233, 240, 246, 0.42);
}

.media__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 网格 ---------- */

.grid {
  display: grid;
  gap: clamp(14px, 2.2vw, 24px);
}

.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)); }

.split {
  display: grid;
  gap: clamp(18px, 3vw, 36px);
  align-items: start;
}

.split--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split--5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

/* ---------- 面包屑 ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumb a { transition: color 0.16s var(--ease); }

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--cyan-soft); }

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

/* ---------- 正文排版 ---------- */

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2,
.prose h3 { margin-top: 1.7em; color: var(--text); }

.prose ul,
.prose ol { display: flex; flex-direction: column; gap: 0.5em; }

.prose li {
  position: relative;
  padding-left: 20px;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.prose a {
  color: var(--cyan-soft);
  border-bottom: 1px solid rgba(47, 224, 192, 0.45);
}

.prose a:hover,
.prose a:focus-visible { border-bottom-color: var(--cyan-soft); }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--cyan-soft);
  background: rgba(47, 224, 192, 0.1);
  padding: 1px 6px;
  border-radius: var(--radius);
}

/* ---------- 筛选条 ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.filter-btn {
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.5;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.filter-btn:hover,
.filter-btn:focus-visible {
  color: var(--text);
  border-color: rgba(47, 224, 192, 0.45);
}

.filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #062018;
  font-weight: 700;
}

.filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

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

/* ---------- 章节侧栏 ---------- */

.chapter-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

.chapter-link {
  display: block;
  padding: 5px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.16s var(--ease);
}

.chapter-link:hover,
.chapter-link:focus-visible { color: var(--text); }

.chapter-link[aria-current="true"] { color: var(--cyan-soft); }

/* ---------- 展开行 ---------- */

.expand-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-align: left;
  transition: color 0.16s var(--ease);
}

.expand-trigger::after {
  content: "+";
  color: var(--cyan);
  font-size: 15px;
  line-height: 1;
  flex: none;
}

.expand-trigger:hover,
.expand-trigger:focus-visible { color: var(--cyan-soft); }

.expand-trigger[aria-expanded="true"] { color: var(--cyan-soft); }
.expand-trigger[aria-expanded="true"]::after { content: "−"; }

.expand-panel {
  display: none;
  padding: 12px 0 6px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.expand-panel.is-open { display: block; }

/* ---------- 进场显现 ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  background: var(--ink-panel);
  border-top: 1px solid var(--line);
  color: var(--text);
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg,
    var(--orange) 0 18%,
    var(--ink-deep) 18% 24%,
    var(--cyan) 24% 52%,
    var(--ink-deep) 52% 58%,
    var(--orange) 58% 76%,
    var(--ink-deep) 76% 82%,
    var(--cyan) 82% 100%);
}

.footer-shell {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: clamp(30px, 5vw, 54px) var(--gutter) 0;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  padding-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--line);
}

.footer-wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: 0.16em;
  line-height: 1.1;
  color: var(--text);
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 48px);
  padding-block: clamp(24px, 4vw, 40px);
}

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

.footer-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--cyan-soft);
  margin-bottom: 14px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-link {
  display: inline-block;
  padding: 2px 0;
  font-size: 15px;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: rgba(47, 224, 192, 0.45);
}

.footer-link[aria-current="page"] { color: var(--cyan-soft); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 15px;
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.footer-contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: #6F8698;
}

.footer-contact-val { color: var(--text); word-break: break-word; }

.footer-contact-val--mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}

.footer-legal .footer-link { font-size: 14px; }

.footer-bar {
  border-top: 1px solid var(--line);
  background: var(--ink-deep);
}

.footer-bar-inner {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 14px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--muted);
}

.footer-bar-text { margin: 0; }

/* ---------- 平板 ---------- */

@media (max-width: 1024px) {
  .split--7-5,
  .split--5-7 { grid-template-columns: minmax(0, 1fr); }

  .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)); }
}

/* ---------- 移动 ---------- */

@media (max-width: 900px) {
  body { font-size: 16px; }

  .header-shell {
    flex-wrap: wrap;
    padding-block: 12px 12px;
    gap: 10px;
  }

  .header-brand {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .nav-toggle { display: flex; }

  .primary-nav {
    margin-left: 0;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 10px var(--gutter) 18px;
    background: var(--ink-panel);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 40px -30px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s linear;
    pointer-events: none;
  }

  .primary-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 13px 2px;
    font-size: 16px;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    color: var(--cyan-soft);
    box-shadow: inset 3px 0 0 var(--cyan);
    padding-left: 12px;
  }

  .nav-alert {
    margin-top: 14px;
    justify-content: center;
    padding-block: 12px;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }

  .footer-bar-inner { flex-direction: column; align-items: flex-start; }

  .paper-card--tilt-l,
  .paper-card--tilt-r { transform: none; }

  .section-head { gap: 8px 14px; }

  .filter-count { margin-left: 0; }
}

/* ---------- 减少动态 ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .status-dot { opacity: 1; transform: none; }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}