/* ============================================================
   银娱电子 · 共享外壳样式 /assets/site.css
   结构：重置 → 变量 → 基础排版 → 工具类 → 容器网格 →
        头部导轨 → 页脚 → 通用组件 → 动效与降级
   ============================================================ */

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

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

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

ul, ol { list-style: none; }
img, svg { max-width: 100%; display: block; }

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

a { color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0A1428;
  --ink-800: #10203C;
  --ink-700: #1B3358;
  --paper-100: #F3EFE6;
  --paper-200: #E2DCCF;
  --metal-300: #C9D1D9;
  --metal-600: #6F7C8A;
  --cyan: #2BE0C8;
  --cyan-text: #0C7C6E;
  --orange: #FF6A2B;
  --orange-text: #BF4308;
  --text-ink: #1A2230;

  --rail-w: 292px;
  --edge: clamp(18px, 4vw, 44px);
  --grid-line: rgba(201, 209, 217, 0.06);

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

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--paper-100);
  color: var(--text-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-ink);
}

h1 { font-size: clamp(2.2rem, 5vw, 4.2rem); font-weight: 900; line-height: 1.08; }
h2 { font-size: clamp(1.6rem, 3vw, 2.125rem); line-height: 1.24; }
h3 { font-size: clamp(1.1rem, 1.7vw, 1.375rem); font-weight: 700; line-height: 1.36; letter-spacing: 0; }

p { max-width: 68ch; text-wrap: pretty; }

strong { font-weight: 700; }

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

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

#main-content { scroll-margin-top: 104px; }
#main-content:focus { outline: none; }

/* ---------- 4. 工具类 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.04em;
}

.serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.sr-only {
  position: absolute;
  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. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--edge);
}

.container--tight { max-width: 900px; }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }

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

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 6. 跳转链接与阅读进度 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  transform: translateY(-180%);
  transition: transform 0.16s ease;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 10px 18px;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

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

.progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 200;
  background: rgba(27, 51, 88, 0.35);
  pointer-events: none;
}

.progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0 72%, var(--orange) 100%);
  transition: transform 0.12s linear;
}

/* ---------- 7. 头部导轨（移动优先） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 150;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--paper-100);
  border-bottom: 1px solid var(--ink-700);
  box-shadow: 0 14px 36px -22px rgba(10, 20, 40, 0.9);
}

.header__top {
  order: 1;
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  padding: 9px 6px 9px 13px;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  position: relative;
  flex: none;
  width: 32px;
  height: 32px;
  background: linear-gradient(140deg, var(--cyan) 0%, #155E75 56%, var(--ink-700) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(10, 20, 40, 0.55);
  border-radius: 50%;
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.05em;
  color: #FFFFFF;
}

.brand__sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: rgba(201, 209, 217, 0.6);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header__action {
  order: 2;
  flex: none;
  margin-right: 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

.nav-toggle {
  order: 3;
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-right: 12px;
  padding: 8px 10px;
  border: 1px solid var(--ink-700);
  background: rgba(16, 32, 60, 0.7);
  color: var(--paper-100);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.nav-toggle:hover { border-color: var(--cyan); }

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 0.22s ease, opacity 0.22s ease;
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

.site-nav {
  order: 5;
  flex: 1 1 100%;
  max-height: 0;
  overflow: hidden;
  padding: 0;
  transition: max-height 0.3s ease;
}

.site-header[data-open] .site-nav {
  max-height: min(72vh, 520px);
  overflow-y: auto;
  padding: 12px 14px 18px;
  border-top: 1px solid var(--ink-700);
}

.site-nav__caption {
  padding: 0 6px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(201, 209, 217, 0.5);
}

.site-nav__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__list::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--ink-700) 0 5px, transparent 5px 11px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 14px 26px 1fr;
  align-items: center;
  gap: 8px;
  padding: 11px 8px;
  text-decoration: none;
  color: rgba(243, 239, 230, 0.76);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  transition: color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.site-nav__link:hover {
  color: #FFFFFF;
  background: rgba(27, 51, 88, 0.55);
}

.nav-node {
  justify-self: center;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--ink-700);
  background: var(--ink-900);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(201, 209, 217, 0.45);
}

.site-nav__label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-nav__link:hover .nav-node {
  border-color: var(--cyan);
  background: rgba(43, 224, 200, 0.32);
}

.site-nav__link[aria-current="page"],
.site-nav__link.is-current {
  color: #FFFFFF;
  background: linear-gradient(90deg, rgba(43, 224, 200, 0.16), rgba(43, 224, 200, 0) 88%);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.site-nav__link[aria-current="page"] .nav-node,
.site-nav__link.is-current .nav-node {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(43, 224, 200, 0.16), 0 0 12px rgba(43, 224, 200, 0.55);
}

.site-nav__link[aria-current="page"] .site-nav__index,
.site-nav__link.is-current .site-nav__index { color: var(--cyan); }

.header__status {
  order: 4;
  flex: 1 1 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(16, 32, 60, 0.55);
  border-top: 1px solid var(--ink-700);
  border-bottom: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  color: rgba(201, 209, 217, 0.72);
}

.status__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(43, 224, 200, 0.85);
  animation: statusPulse 2.6s ease-in-out infinite;
}

.status__text {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 26px 26px;
  color: rgba(243, 239, 230, 0.8);
  border-top: 1px solid var(--ink-700);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 96px, var(--orange) 96px 134px, var(--ink-700) 134px 100%);
}

.footer__wrap {
  padding-top: clamp(34px, 5vw, 62px);
  padding-bottom: clamp(20px, 3vw, 30px);
}

.footer__grid {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  grid-template-columns: 1fr;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.footer__mark {
  position: relative;
  width: 38px;
  height: 38px;
  margin-bottom: 4px;
  background: linear-gradient(140deg, var(--cyan) 0%, #155E75 56%, var(--ink-700) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
}

.footer__mark::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(10, 20, 40, 0.55);
  border-radius: 50%;
}

.footer__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.06em;
  color: #FFFFFF;
}

.footer__tagline {
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: rgba(243, 239, 230, 0.7);
  max-width: 26ch;
}

.footer__signature {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--cyan);
  padding-top: 4px;
  max-width: none;
}

.footer__meta {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed rgba(201, 209, 217, 0.18);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: rgba(201, 209, 217, 0.62);
  max-width: none;
}

.footer__col { min-width: 0; }

.footer__col-title {
  padding-bottom: 9px;
  margin-bottom: 10px;
  border-bottom: 1px dashed rgba(201, 209, 217, 0.2);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  font-size: 14.5px;
  color: rgba(243, 239, 230, 0.76);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer__link::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  border: 1px solid rgba(43, 224, 200, 0.5);
  transform: rotate(45deg);
  transition: background 0.18s ease, border-color 0.18s ease;
}

.footer__link:hover,
.footer__link:focus-visible {
  color: #FFFFFF;
  border-bottom-color: var(--cyan);
}

.footer__link:hover::before,
.footer__link:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.footer__contact {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 10px 26px;
  grid-template-columns: 1fr;
  border: 1px solid var(--ink-700);
  background: linear-gradient(180deg, rgba(16, 32, 60, 0.94), rgba(10, 20, 40, 0.62));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.footer__contact-title {
  grid-column: 1 / -1;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(201, 209, 217, 0.18);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
  max-width: none;
}

.contact__row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(201, 209, 217, 0.55);
}

.contact__val {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper-100);
  word-break: break-word;
}

.contact__val--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.footer__note {
  grid-column: 1 / -1;
  margin-top: 4px;
  padding-top: 8px;
  border-top: 1px dashed rgba(201, 209, 217, 0.16);
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(201, 209, 217, 0.66);
  max-width: none;
}

.footer__legal {
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 16px;
  border-top: 1px solid var(--ink-700);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: rgba(201, 209, 217, 0.55);
}

.footer__legal-line,
.footer__copyright {
  line-height: 1.8;
  max-width: none;
}

.footer__legal .mono { color: rgba(201, 209, 217, 0.85); }

/* ---------- 9. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

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

.btn--signal {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
  font-weight: 800;
}

.btn--signal:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.btn--ghost {
  background: transparent;
  border-color: var(--ink-700);
  color: var(--paper-100);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  background: rgba(16, 32, 60, 0.85);
}

.btn--paper {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper-100);
}

.btn--paper:hover { color: var(--cyan); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--metal-600);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  color: currentColor;
  opacity: 0.45;
}

.breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.breadcrumb a:hover {
  color: var(--cyan-text);
  border-bottom-color: var(--cyan-text);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--metal-300);
  background: rgba(255, 255, 255, 0.4);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--metal-600);
  white-space: nowrap;
}

.tag--cyan { border-color: var(--cyan-text); color: var(--cyan-text); }

.tag--signal {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
  font-weight: 700;
}

.tag--on-dark {
  background: rgba(16, 32, 60, 0.7);
  border-color: var(--ink-700);
  color: rgba(201, 209, 217, 0.92);
}

.placard {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  padding: 12px 14px;
  border: 1px solid rgba(27, 51, 88, 0.18);
  background: var(--paper-200);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--metal-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--metal-600);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan-text);
}

.eyebrow--on-dark { color: rgba(201, 209, 217, 0.8); }
.eyebrow--on-dark::before { background: var(--cyan); }

.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1em;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--cyan-text);
  transform: rotate(45deg);
}
.prose ol { list-style: decimal; }
.prose a { color: var(--cyan-text); }

/* 图片容器基座：页面阶段放 <img> 或占位图层 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(to right, rgba(201, 209, 217, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 209, 217, 0.07) 1px, transparent 1px);
  background-size: 22px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(43, 224, 200, 0.12), transparent 42%, rgba(255, 106, 43, 0.1));
  mix-blend-mode: screen;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 12px;
  background: var(--ink-900);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- 10. 入场动效 ---------- */
.reveal-on [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 11. 断点 ---------- */
@media (min-width: 420px) {
  .brand__sub { font-size: 10px; }
}

@media (min-width: 640px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .footer__contact { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    height: 100vh;
    height: 100dvh;
    flex-wrap: nowrap;
    flex-direction: column;
    align-items: stretch;
    padding: 24px 18px 18px;
    border-bottom: 0;
    border-right: 1px solid var(--ink-700);
    box-shadow: 18px 0 44px -32px rgba(10, 20, 40, 0.95);
  }

  .header__top {
    order: 1;
    flex: 0 0 auto;
    padding: 0 0 18px;
    border-bottom: 1px solid var(--ink-700);
  }

  .header__action {
    order: 4;
    width: 100%;
    margin: 14px 0 0;
    padding: 12px 16px;
    font-size: 14px;
  }

  .nav-toggle { display: none; }

  .site-nav,
  .site-header[data-open] .site-nav {
    order: 2;
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
    overflow-y: auto;
    padding: 18px 0 10px;
    border-top: 0;
    transition: none;
  }

  .site-nav__caption { padding: 0 6px 12px; }
  .site-nav__link { padding: 12px 8px; font-size: 15.5px; }

  .header__status {
    order: 3;
    flex: 0 0 auto;
    padding: 10px 0 0;
    background: transparent;
    border-top: 1px solid var(--ink-700);
    border-bottom: 0;
    font-size: 10.5px;
  }

  .progress { left: var(--rail-w); }

  .footer__grid {
    grid-template-columns: minmax(220px, 1.35fr) repeat(3, minmax(140px, 1fr));
  }

  #main-content { scroll-margin-top: 40px; }
}

/* ---------- 12. 降低动态效果 ---------- */
@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;
  }

  .status__dot { animation: none; opacity: 1; }

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

  .progress__bar { transition: none; }
  .btn:hover { transform: none; }
}