/* ============================================================
   米乐赛场 · 共享外壳样式 /assets/site.css
   夜场数据研究板 —— 蓝图网格 · 切角面板 · 矿物色点缀
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --night: #0B1220;
  --slate: #131C2B;
  --line: #2E3A4D;
  --cyan: #26E0D6;
  --cyan-soft: rgba(38, 224, 214, 0.45);
  --orange: #FF6B2C;
  --sand: #D8B46A;
  --snow: #F2F6F8;
  --mist: #7C8DA6;
  --moss: #6F8F6A;
  --clay: #A65C3E;

  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono",
    "DejaVu Sans Mono", Menlo, Consolas, monospace;

  --wrap: 1280px;
  --gut: clamp(16px, 4vw, 40px);
  --radius: 2px;
  --header-h: 54px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body, figure, blockquote, dl, dd { margin: 0; }

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

button, input, select, textarea { font: inherit; color: inherit; }

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

table { border-collapse: collapse; width: 100%; }

/* ---------- 3. 中文排版基调 ---------- */
body {
  background: var(--night);
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  margin: 0 0 0.62em;
  font-weight: 800;
  font-stretch: 88%;
  letter-spacing: -0.012em;
  line-height: 1.26;
  color: var(--snow);
  text-wrap: balance;
}

h1 { font-size: clamp(1.7rem, 4.2vw, 2.7rem); }
h2 { font-size: clamp(1.3rem, 2.6vw, 1.85rem); }
h3 { font-size: clamp(1.05rem, 1.7vw, 1.26rem); }
h4 { font-size: 1rem; }

p { margin: 0 0 1em; max-width: 38em; }

a { color: var(--cyan); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--snow); }

strong, b { font-weight: 700; color: var(--snow); }

::selection { background: rgba(38, 224, 214, 0.28); color: var(--snow); }

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

/* ---------- 4. 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.clip-corner {
  clip-path: polygon(
    0 0,
    calc(100% - 16px) 0,
    100% 16px,
    100% 100%,
    16px 100%,
    0 calc(100% - 16px)
  );
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 320;
  padding: 10px 18px;
  background: var(--orange);
  color: #0B1220;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; color: #0B1220; }

/* ---------- 5. 布局容器与网格 ---------- */
.container {
  width: min(var(--wrap), calc(100% - var(--gut) * 2));
  margin-inline: auto;
}
.container--narrow { max-width: 820px; }

.section { padding-block: clamp(36px, 6vw, 72px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}
.sec-title { margin: 0; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--snow);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}
.btn:hover { border-color: var(--cyan); color: var(--cyan); }
.btn:active { border-color: var(--orange); color: var(--orange); }

.btn--primary {
  border-color: transparent;
  background: var(--orange);
  color: #0B1220;
}
.btn--primary:hover { background: #FF8148; border-color: transparent; color: #0B1220; }

.btn--ghost { border-color: var(--cyan-soft); color: var(--cyan); }
.btn--ghost:hover { background: rgba(38, 224, 214, 0.1); color: var(--cyan); }

/* ---------- 7. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb-item { display: inline-flex; align-items: center; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.breadcrumb-item a { color: var(--mist); }
.breadcrumb-item a:hover { color: var(--cyan); }
.breadcrumb-item[aria-current="page"] { color: var(--sand); }

/* ---------- 8. 标签与数字 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--mist);
  white-space: nowrap;
}
.tag--cyan { border-color: var(--cyan-soft); color: var(--cyan); }
.tag--orange { border-color: rgba(255, 107, 44, 0.5); color: var(--orange); }
.tag--moss { border-color: rgba(111, 143, 106, 0.65); color: #9DBB98; }
.tag--clay { border-color: rgba(166, 92, 62, 0.65); color: #D08B6C; }

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--sand);
}
.data-num--xl {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
}

/* ---------- 9. 折叠面板 ---------- */
.panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}
.panel[data-open="true"] { grid-template-rows: 1fr; }
.panel-inner { overflow: hidden; min-height: 0; }
.panel-body {
  padding: 16px 20px 20px;
  background: rgba(19, 28, 43, 0.82);
  border-top: 1px dashed var(--line);
  color: var(--mist);
}
.panel-body p { color: var(--mist); }

.panel-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 14px 18px;
  background: var(--slate);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--snow);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.panel-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.panel-toggle::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--sand);
  transition: color 0.2s ease;
}
.panel-toggle[aria-expanded="true"] { border-color: var(--cyan-soft); }
.panel-toggle[aria-expanded="true"]::after { content: "–"; color: var(--orange); }

/* ---------- 10. 图片容器（页面阶段放置占位） ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(38, 224, 214, 0.09), transparent 60%),
    linear-gradient(165deg, #101A29 0%, #0B1220 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(38, 224, 214, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(38, 224, 214, 0.06) 1px, transparent 1px);
  background-size: 34px 34px;
}
.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--banner { aspect-ratio: 21 / 9; }
.img-frame--square { aspect-ratio: 1 / 1; }
.img-frame--tall { aspect-ratio: 4 / 5; }

/* ---------- 11. 显示型文字 ---------- */
.display {
  font-weight: 900;
  font-stretch: 87.5%;
  letter-spacing: -0.02em;
  line-height: 1.14;
}
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: relative;
  background: var(--night);
  border-bottom: 1px solid var(--line);
  z-index: 40;
}

.header-grid {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(46, 58, 77, 0.5) 1px, transparent 1px),
    linear-gradient(180deg, rgba(46, 58, 77, 0.34) 1px, transparent 1px);
  background-size: 80px 100%, 100% 40px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.25) 70%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.25) 70%, transparent 100%);
}

/* --- 刊头 --- */
.masthead {
  position: relative;
  padding: clamp(20px, 3.6vw, 38px) 0 clamp(14px, 2.2vw, 22px);
}
.masthead-inner {
  width: min(var(--wrap), calc(100% - var(--gut) * 2));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
}

.mast-index {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}
.idx-item { display: inline-flex; align-items: baseline; gap: 6px; }
.idx-label { text-transform: uppercase; }
.idx-num {
  font-size: 0.96rem;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.mast-brand {
  justify-self: center;
  text-align: center;
}
.brand-link {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--snow);
}
.brand-link:hover { color: var(--snow); }
.brand-mark {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  padding: 3px 6px;
  color: var(--cyan);
  border: 1px solid var(--cyan-soft);
  transform: translateY(-5px);
}
.brand-name {
  font-size: clamp(1.55rem, 3.4vw, 2.25rem);
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: 0.07em;
  line-height: 1;
}
.mast-tag {
  margin: 9px 0 0;
  max-width: none;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  color: var(--mist);
}

.mast-utility {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}
.mast-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  white-space: nowrap;
}
.status-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(38, 224, 214, 0.14);
  animation: dot-pulse 2.6s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

.util-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1;
  color: var(--mist);
  background: rgba(19, 28, 43, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}
.util-link:hover { border-color: var(--cyan); color: var(--cyan); }
.util-link--accent { border-color: rgba(216, 180, 106, 0.5); color: var(--sand); }
.util-link--accent:hover { border-color: var(--sand); color: var(--sand); }

/* --- 导航 --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 18, 32, 0.92);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
@supports (backdrop-filter: blur(2px)) {
  .site-nav { backdrop-filter: blur(12px); background: rgba(11, 18, 32, 0.82); }
}

.nav-inner {
  width: min(var(--wrap), calc(100% - var(--gut) * 2));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  min-height: var(--header-h);
}

.nav-status {
  grid-column: 1;
  justify-self: start;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  grid-column: 1;
  grid-row: 1;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 9px;
  flex: none;
  background: linear-gradient(currentColor, currentColor) center / 100% 1.5px no-repeat;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.25s ease, top 0.25s ease;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { top: 8px; }
.nav-toggle[aria-expanded="true"] { border-color: var(--cyan-soft); color: var(--cyan); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 4px; transform: rotate(-45deg); }

.nav-list {
  grid-column: 2;
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.7vw, 26px);
}

.nav-link {
  position: relative;
  display: block;
  padding: 16px 2px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mist);
  white-space: nowrap;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease, background-color 0.2s ease;
}
.nav-link:hover { color: var(--snow); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--snow); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--cyan); }

.nav-cta {
  grid-column: 3;
  justify-self: end;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  line-height: 1.4;
  color: var(--orange);
  border: 1px solid rgba(255, 107, 44, 0.5);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav-cta:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: #0B1220;
}

/* --- 阅读进度 --- */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 220;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, #5FE9C8 45%, var(--orange) 100%);
  will-change: transform;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 120px);
  background: linear-gradient(180deg, var(--night) 0%, #080E19 100%);
  border-top: 1px solid var(--line);
}
.footer-lines {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 96px;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0 1px,
    transparent 1px 64px
  );
  opacity: 0.32;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent);
  mask-image: linear-gradient(180deg, #000, transparent);
}

.footer-inner {
  position: relative;
  width: min(var(--wrap), calc(100% - var(--gut) * 2));
  margin-inline: auto;
  padding: clamp(36px, 5.5vw, 64px) 0 clamp(24px, 3.6vw, 40px);
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) 2.6fr;
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand {
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}
.footer-logo {
  display: inline-block;
  font-size: 1.4rem;
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: 0.08em;
  color: var(--snow);
}
.footer-logo:hover { color: var(--cyan); }
.footer-tag {
  margin: 10px 0 18px;
  max-width: none;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  max-width: none;
  font-size: 0.76rem;
  color: var(--mist);
}
.fact-item { display: inline-flex; align-items: baseline; gap: 5px; }
.fact-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}
.footer-col-title {
  margin: 0 0 14px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--sand);
}
.footer-col-title::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 1px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--line);
}
.footer-list { display: grid; gap: 2px; }
.footer-link {
  display: block;
  padding: 5px 0;
  font-size: 0.86rem;
  color: var(--mist);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-link:hover { color: var(--cyan); padding-left: 3px; }

.footer-legal {
  background: rgba(8, 14, 25, 0.62);
  border-top: 1px solid var(--line);
}
.footer-legal-inner {
  width: min(var(--wrap), calc(100% - var(--gut) * 2));
  margin-inline: auto;
  padding: 22px 0 34px;
  display: grid;
  gap: 10px;
}
.legal-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  margin: 0;
  max-width: none;
  font-size: 0.79rem;
  color: var(--mist);
}
.legal-line a {
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}
.legal-line a:hover { color: var(--cyan); border-color: var(--cyan); }

.contact-line {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--mist);
  word-break: break-word;
}
.footer-note {
  margin: 0;
  max-width: 66ch;
  font-size: 0.74rem;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.82;
}
.footer-copy {
  margin: 6px 0 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  opacity: 0.7;
}

.to-top {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 150;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  background: var(--slate);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--mist);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s,
    border-color 0.2s ease, color 0.2s ease;
}
.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { border-color: var(--cyan); color: var(--cyan); }

/* ============================================================
   滚动入场与章节高亮
   ============================================================ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
html.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-section].is-active .sec-num { color: var(--cyan); }
[data-section-link] { transition: color 0.2s ease, border-color 0.2s ease; }
[data-section-link].is-active {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1100px) {
  .nav-status { display: none; }
  .nav-cta { font-size: 0.68rem; padding: 7px 11px; }
  .mast-status { display: none; }
}

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  /* 刊头压缩 */
  .masthead { padding: 16px 0 12px; }
  .masthead-inner { grid-template-columns: 1fr; gap: 10px; }
  .mast-brand { order: -1; }
  .mast-index { justify-content: center; gap: 14px; font-size: 0.66rem; }
  .mast-utility { justify-content: center; gap: 8px; }
  .mast-tag { font-size: 0.72rem; margin-top: 7px; }
  .brand-mark { transform: translateY(-4px); }

  /* 导航转为侧滑面板 */
  .nav-inner { grid-template-columns: auto 1fr auto; gap: 10px; }
  .nav-toggle { display: inline-flex; }
  .nav-status { display: none; }

  .nav-list {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 130;
    width: min(84vw, 340px);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 78px 20px 32px;
    background: #0B1220;
    border-left: 1px solid var(--line);
    box-shadow: -30px 0 64px rgba(0, 0, 0, 0.55);
    overflow-y: auto;
    transform: translateX(103%);
    transition: transform 0.34s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .nav-list[data-open="true"] { transform: translateX(0); }

  .nav-link {
    padding: 15px 4px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(46, 58, 77, 0.55);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); padding-left: 16px; }
  .nav-link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    background: var(--cyan);
    transform: translateY(-50%) rotate(45deg);
  }

  .site-nav[data-open="true"]::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 120;
    background: rgba(11, 18, 32, 0.74);
  }

  /* 页脚 */
  .footer-inner { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .grid--2, .grid--3, .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .footer-brand { padding-left: 12px; }
  .util-link { font-size: 0.68rem; padding: 6px 10px; }
  .to-top { width: 42px; height: 42px; }
  .mast-utility .util-link:nth-of-type(2) { display: none; }
}

@media (max-width: 400px) {
  .nav-cta { display: none; }
}

/* ============================================================
   动效降级
   ============================================================ */
@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;
  }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .panel { transition: none; }
  .nav-list { transition: none; }
}

@media print {
  .site-nav, .read-progress, .to-top, .nav-toggle { display: none; }
  body { background: #fff; color: #000; }
}