/* ============================================================
   安信10指南 · /assets/site.css
   夜间值班室导航屏：墨蓝底 + 纵向轨道 + 信号橙锚点
   ============================================================ */

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

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

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

ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

html.is-locked { overflow: hidden; }

/* 2. tokens */
:root {
  --ink-900: #070E18;
  --ink-800: #0D1A2B;
  --ink-700: #14263C;
  --steel-500: #2C4A63;
  --mist-300: #8FA6B8;
  --highlight-050: #EEF4F8;
  --signal-500: #FF6A2B;
  --ember-600: #E0501A;
  --scan-400: #2FB6A8;
  --glass: rgba(238, 244, 248, 0.08);

  --text: #D9E5EE;
  --text-soft: var(--mist-300);
  --line: rgba(44, 74, 99, 0.85);
  --line-soft: rgba(44, 74, 99, 0.45);

  --rail-w: 248px;
  --status-h: 46px;
  --shell: 1180px;
  --gutter: clamp(16px, 4vw, 40px);

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --dur: 160ms;
  --ease: ease-out;
  --shadow-lift: 0 14px 30px -22px rgba(0, 0, 0, 0.95);
}

/* 3. base */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 520px at 84% -14%, rgba(47, 182, 168, 0.10), transparent 62%),
    radial-gradient(880px 460px at 4% 2%, rgba(255, 106, 43, 0.07), transparent 64%),
    repeating-linear-gradient(90deg, rgba(44, 74, 99, 0.20) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(44, 74, 99, 0.12) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  color: var(--highlight-050);
  letter-spacing: 0;
}

p { max-width: 68ch; }

::selection {
  background: var(--signal-500);
  color: var(--ink-900);
}

/* 4. layout utilities */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.section-head {
  display: grid;
  gap: 10px;
  margin-block-end: clamp(20px, 3vw, 36px);
}

.display-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 64px);
  font-weight: 800;
  line-height: 1.06;
  color: var(--highlight-050);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal-500);
}

.lede {
  font-size: clamp(16px, 1.4vw, 20px);
  color: var(--text-soft);
  max-width: 64ch;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 5. components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--steel-500);
  background: transparent;
  color: var(--highlight-050);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--mist-300);
}

.btn--primary {
  background: var(--signal-500);
  border-color: var(--signal-500);
  color: var(--ink-900);
}

.btn--primary:hover {
  background: var(--ember-600);
  border-color: var(--ember-600);
  color: var(--highlight-050);
}

.btn--ghost {
  background: var(--glass);
  border-color: var(--steel-500);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.btn--ghost:hover {
  border-color: var(--mist-300);
  background: rgba(238, 244, 248, 0.12);
}

.btn--quiet {
  padding-inline: 10px;
  border-color: transparent;
  color: var(--mist-300);
}

.btn--quiet:hover {
  color: var(--highlight-050);
  border-color: var(--line);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist-300);
}

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

.breadcrumb li + li::before {
  content: "/";
  color: var(--steel-500);
}

.breadcrumb a:hover { color: var(--signal-500); }
.breadcrumb [aria-current="page"] { color: var(--highlight-050); }

.card {
  position: relative;
  padding: 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 10px;
  background: var(--card-cut, var(--ink-900));
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--mist-300);
  box-shadow: var(--shadow-lift);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal-500);
}

.card__title {
  margin-block: 6px 8px;
  font-size: 20px;
  font-weight: 800;
  color: var(--highlight-050);
}

.card__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--steel-500);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist-300);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.chip:hover {
  color: var(--highlight-050);
  border-color: var(--mist-300);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--signal-500);
  border-color: var(--signal-500);
  color: var(--ink-900);
}

.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(47, 182, 168, 0.12), transparent 56%),
    linear-gradient(160deg, var(--ink-700), var(--ink-800) 58%, var(--ink-900));
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

.copy-btn {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--mist-300);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.copy-btn:hover {
  border-color: var(--signal-500);
  color: var(--signal-500);
}

.copy-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--scan-400);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.copy-hint.is-visible { opacity: 1; }

/* 6. header */
.site-header {
  position: relative;
  z-index: 50;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 16px;
  background: var(--signal-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-220%);
  transition: transform var(--dur) var(--ease);
}

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

/* 6.1 状态条 */
.status-bar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(13, 26, 43, 0.94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.status-bar__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--signal-500);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.status-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--status-h);
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.status-bar__track {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 12px;
}

.status-bar__label {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist-300);
  opacity: 0.7;
}

.status-bar__chapter {
  max-width: 42vw;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--highlight-050);
}

.status-bar__ticks {
  width: 72px;
  height: 10px;
  flex: none;
  background-image: repeating-linear-gradient(90deg, var(--steel-500) 0 1px, transparent 1px 12px);
  opacity: 0.8;
}

.status-bar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.member-anchor {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--signal-500);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.member-anchor:hover {
  background: var(--ember-600);
  color: var(--highlight-050);
}

.member-anchor__dot {
  width: 6px;
  height: 6px;
  background: var(--ink-900);
  transition: background-color var(--dur) var(--ease);
}

.member-anchor:hover .member-anchor__dot { background: var(--highlight-050); }

.search-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid transparent;
  font-size: 13px;
  color: var(--mist-300);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.search-link:hover {
  color: var(--highlight-050);
  border-color: var(--line);
  background: var(--glass);
}

.search-link__icon {
  position: relative;
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-radius: 50%;
}

.search-link__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 2px;
  height: 7px;
  background: currentColor;
  transform: rotate(45deg);
}

.search-link__text { letter-spacing: 0.04em; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--highlight-050);
  font-size: 13px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--mist-300);
  background: var(--glass);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 6.2 纵向轨道 */
.rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 70;
  display: flex;
  flex-direction: column;
  width: var(--rail-w);
  padding: 16px 16px 18px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: linear-gradient(180deg, #0F1F31 0%, var(--ink-800) 46%, #0A1523 100%);
  border-right: 1px solid var(--line);
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 4px 18px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--highlight-050);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: var(--ink-700);
  border: 1px solid var(--steel-500);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--signal-500);
}

.brand-text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--highlight-050);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.rail__nav {
  flex: 1 1 auto;
  margin-block-start: 20px;
}

.rail__list {
  position: relative;
  display: grid;
  gap: 2px;
  padding-inline-start: 22px;
}

.rail__list::before {
  content: "";
  position: absolute;
  inset-block: 8px;
  inset-inline-start: 6px;
  width: 1px;
  background: var(--line);
}

.rail__item { position: relative; }

.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 4px;
  color: var(--text);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.rail__link::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--steel-500);
  transform: translateY(-50%);
  transition: width var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.rail__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel-500);
  transition: color var(--dur) var(--ease);
}

.rail__label {
  font-size: 15px;
  font-weight: 500;
}

.rail__link:hover {
  color: var(--highlight-050);
  background: rgba(238, 244, 248, 0.05);
}

.rail__link:hover::before {
  width: 12px;
  background: var(--mist-300);
}

.rail__link:hover .rail__index { color: var(--mist-300); }

.rail__link[aria-current="page"] {
  color: var(--highlight-050);
  background: linear-gradient(90deg, rgba(255, 106, 43, 0.18), transparent 78%);
}

.rail__link[aria-current="page"]::before {
  width: 12px;
  height: 3px;
  background: var(--signal-500);
}

.rail__link[aria-current="page"] .rail__index { color: var(--signal-500); }

.rail__meta {
  display: grid;
  gap: 8px;
  margin-block-start: 22px;
  padding-block-start: 14px;
  border-top: 1px solid var(--line-soft);
}

.rail__meta-line {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist-300);
}

.rail__meta-key {
  letter-spacing: 0.16em;
  color: var(--steel-500);
}

.rail__meta-value {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
}

.pulse-dot {
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--scan-400);
  box-shadow: 0 0 0 3px rgba(47, 182, 168, 0.18);
}

.rail__help {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-block-start: 6px;
  padding: 9px 12px;
  border: 1px solid var(--steel-500);
  background: var(--glass);
  font-size: 13px;
  color: var(--highlight-050);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.rail__help::after {
  content: "\2192";
  font-family: var(--font-mono);
  color: var(--signal-500);
}

.rail__help:hover {
  border-color: var(--signal-500);
  background: rgba(255, 106, 43, 0.12);
}

/* 6.3 遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(7, 14, 24, 0.68);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 200ms var(--ease), visibility 200ms var(--ease);
}

.site-header[data-open="true"] .nav-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* 7. footer */
.site-footer {
  position: relative;
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  color: var(--text);
}

.site-footer::before {
  content: "";
  display: block;
  height: 8px;
  background: linear-gradient(90deg, var(--signal-500) 0 72px, var(--ink-700) 72px 100%);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 64px) var(--gutter) clamp(24px, 4vw, 40px);
}

.footer__brand {
  display: grid;
  gap: 14px;
  align-content: start;
}

.footer__brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--highlight-050);
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
}

.footer__closing {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--highlight-050);
  max-width: 22ch;
}

.footer__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-300);
  max-width: 34ch;
}

.footer__col {
  display: grid;
  gap: 12px;
  align-content: start;
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist-300);
  opacity: 0.85;
}

.footer__list {
  display: grid;
  gap: 8px;
}

.footer__link {
  font-size: 14px;
  color: var(--text);
  transition: color var(--dur) var(--ease);
}

.footer__link:hover {
  color: var(--signal-500);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.footer__col--contact { gap: 14px; }

.footer__contact {
  display: grid;
  gap: 10px;
}

.footer__contact-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  align-items: baseline;
  padding-block-start: 10px;
  border-top: 1px solid var(--line-soft);
}

.footer__contact-row:first-child {
  padding-block-start: 0;
  border-top: 0;
}

.footer__contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist-300);
  opacity: 0.8;
}

.footer__contact-val {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  overflow-wrap: anywhere;
  max-width: none;
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mist-300);
}

.footer__copy,
.footer__icp,
.footer__service { max-width: none; }

.footer__icp { color: var(--steel-500); }

.footer__service { color: var(--scan-400); }

/* 8. focus / motion */
:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: 2px;
}

.rail__link:focus-visible { outline-offset: -2px; }

@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;
  }

  .card:hover,
  .btn:hover { transform: none; }
}

/* 9. 响应式 */
@media (min-width: 720px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

  .footer__grid { grid-template-columns: 1.5fr 0.8fr 0.8fr 1.5fr; }

  .nav-scrim { display: none; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .rail {
    top: 0;
    left: 0;
    width: min(86vw, 320px);
    padding-block-start: 14px;
    transform: translateX(-104%);
    visibility: hidden;
    box-shadow: 28px 0 64px -48px #000;
    transition: transform 220ms var(--ease), visibility 220ms var(--ease);
  }

  .site-header[data-open="true"] .rail {
    transform: translateX(0);
    visibility: visible;
  }

  .rail__brand { padding-block-start: 10px; }
}

@media (max-width: 767px) {
  .status-bar__label,
  .status-bar__ticks { display: none; }

  .status-bar__chapter { max-width: 46vw; }

  .search-link__text { display: none; }

  .search-link { padding: 7px 8px; }

  .member-anchor { padding: 7px 11px; font-size: 12px; }

  .nav-toggle__text { display: none; }

  .footer__base { flex-direction: column; align-items: flex-start; gap: 6px; }
}