:root {
  --ink: #101820;
  --city: #1B2733;
  --stand: #2E3C4A;
  --concrete: #8A99A8;
  --paper: #F4F1EA;
  --signal: #F05A28;
  --signal-soft: #FF8A5C;
  --amber: #E6A817;
  --mint: #22D3A6;
  --line: #6B7C8F;
  --rule: rgba(107, 124, 143, 0.42);
  --gutter: 32px;
  --speed: 160ms;
  --font-display: "Arial Narrow", "Haettenschweiler", "Impact", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  border: 1px solid var(--rule);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(107, 124, 143, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(107, 124, 143, 0.1) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

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

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

:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 3px;
}

::selection {
  background: var(--signal);
  color: #fff;
}

/* ---------- 无障碍跳转 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 400;
  transform: translateY(-200%);
  padding: 10px 18px;
  background: var(--signal);
  color: #fff;
  border: 1px solid #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  transition: transform var(--speed) ease-out;
}

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

/* ---------- 容器与排版工具 ---------- */
.container {
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stand);
}

.eyebrow::before {
  content: "";
  flex: 0 0 auto;
  width: 22px;
  height: 2px;
  background: var(--signal);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--city);
  background: var(--city);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  line-height: 1.2;
  cursor: pointer;
  transition: background var(--speed) ease-out, color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.btn:hover,
.btn:focus-visible {
  background: var(--signal);
  border-color: var(--signal);
  color: #fff;
}

.btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: #fff;
}

.btn--signal:hover,
.btn--signal:focus-visible {
  background: #d84a1c;
  border-color: #d84a1c;
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--city);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--city);
  border-color: var(--city);
  color: var(--paper);
}

.btn--mint {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--city);
}

.btn--mint:hover,
.btn--mint:focus-visible {
  background: var(--city);
  border-color: var(--city);
  color: var(--mint);
}

/* ---------- 行内跳转 ---------- */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--signal);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.link-arrow::after {
  content: "→";
  transition: transform var(--speed) ease-out;
}

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

.link-arrow:hover::after,
.link-arrow:focus-visible::after {
  transform: translateX(3px);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--concrete);
}

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

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

.breadcrumbs a {
  color: var(--concrete);
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

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

/* ---------- 芯片与标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--stand);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.3;
  cursor: pointer;
  transition: background var(--speed) ease-out, color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.chip:hover,
.chip:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--city);
  border-color: var(--city);
  color: var(--paper);
}

.tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  line-height: 1.4;
}

.tag--signal {
  color: var(--signal);
}

.tag--amber {
  color: #a8710a;
}

.tag--mint {
  color: #0d7d64;
}

.tag--steel {
  color: var(--line);
}

/* ---------- 图片容器基座 ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: var(--stand);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.3) contrast(1.06);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(180deg, rgba(27, 39, 51, 0) 45%, rgba(27, 39, 51, 0.62) 100%),
    repeating-linear-gradient(90deg, rgba(244, 241, 234, 0.12) 0 1px, transparent 1px 60px);
}

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

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

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

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 7px 12px;
  background: var(--signal);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.media-frame__label--amber {
  background: var(--amber);
  color: var(--city);
}

.media-frame__label--mint {
  background: var(--mint);
  color: var(--city);
}

/* ---------- 数据表 ---------- */
.data-table {
  width: 100%;
  font-size: 0.875rem;
  border-top: 2px solid var(--city);
  text-align: left;
}

.data-table th {
  padding: 9px 12px;
  background: var(--stand);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.data-table tbody tr {
  transition: background var(--speed) ease-out;
}

.data-table tbody tr:hover,
.data-table tbody tr:focus-within {
  background: rgba(240, 90, 40, 0.06);
}

.data-table tbody tr:hover td:first-child,
.data-table tbody tr:focus-within td:first-child {
  box-shadow: inset 3px 0 0 var(--signal);
}

.cell-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

/* ---------- 章节头 ---------- */
.section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--city);
}

.section-head--split {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.015em;
}

/* ---------- 坐标栅格 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--city);
  color: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.frame-top {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid rgba(107, 124, 143, 0.35);
}

.brand {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  padding: 13px 20px;
  border-right: 1px solid rgba(107, 124, 143, 0.35);
  color: var(--paper);
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  background: var(--signal);
  color: #fff;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1;
  transition: background var(--speed) ease-out;
}

.brand:hover .brand-mark,
.brand:focus-visible .brand-mark {
  background: var(--signal-soft);
}

.brand-text {
  display: block;
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.brand-coord {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--concrete);
}

.frame-hours {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 auto 0 0;
  padding: 0 20px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--concrete);
}

.frame-hours::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(34, 211, 166, 0.16);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  border-left: 1px solid rgba(107, 124, 143, 0.35);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.nav-toggle-label {
  white-space: nowrap;
}

.nav-toggle-bars {
  position: relative;
  display: block;
  flex: 0 0 auto;
  width: 18px;
  height: 2px;
  background: var(--signal-soft);
  transition: background var(--speed) ease-out;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--signal-soft);
  transition: transform var(--speed) ease-out;
}

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

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

.site-header[data-open="true"] .nav-toggle-bars {
  background: transparent;
}

.site-header[data-open="true"] .nav-toggle-bars::before {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav {
  background: var(--city);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
}

.nav-item {
  display: flex;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 12px 22px;
  border-right: 1px solid rgba(107, 124, 143, 0.22);
  color: #b9c4cf;
  font-size: 0.84375rem;
  letter-spacing: 0.03em;
  transition: color var(--speed) ease-out, background var(--speed) ease-out;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--speed) ease-out;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #fff;
  background: rgba(255, 138, 92, 0.1);
}

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

.nav-link[aria-current="page"] {
  color: #fff;
  background: rgba(240, 90, 40, 0.16);
}

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

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--signal-soft);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-image: linear-gradient(90deg, var(--signal) 0%, var(--amber) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 80ms linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 64px;
  padding: clamp(34px, 5vw, 62px) var(--gutter) 0;
  background-color: var(--city);
  background-image:
    repeating-linear-gradient(90deg, rgba(107, 124, 143, 0.16) 0 1px, transparent 1px 48px);
  color: #aebac6;
  border-top: 4px solid var(--signal);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr 0.9fr 1.15fr;
  gap: 32px 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(107, 124, 143, 0.35);
}

.footer-brand-link {
  display: inline-block;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--signal);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.footer-brand-link:hover,
.footer-brand-link:focus-visible {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

.footer-coord {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--concrete);
}

.footer-note {
  margin-top: 10px;
  max-width: 30ch;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: #93a2b0;
}

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

.footer-heading {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(107, 124, 143, 0.35);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-soft);
}

.footer-list {
  display: grid;
  gap: 8px;
}

.footer-link {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  color: #b9c4cf;
  font-size: 0.875rem;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: #fff;
  border-bottom-color: var(--signal);
}

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

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-item {
  display: grid;
  gap: 2px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--concrete);
}

.contact-value {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: #c6d0da;
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 18px 0 22px;
}

.footer-fine {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: #7f8d9b;
}

/* ---------- 平板 ---------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid-12 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

/* ---------- 移动导航 ---------- */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .frame-hours {
    display: none;
  }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 220ms ease-out, visibility 0s linear 220ms;
  }

  .site-header[data-open="true"] .site-nav {
    max-height: 70vh;
    overflow-y: auto;
    visibility: visible;
    transition: max-height 220ms ease-out;
  }

  .nav-list {
    flex-direction: column;
  }

  .nav-item {
    display: block;
  }

  .nav-link {
    padding: 14px 20px;
    border-right: 0;
    border-bottom: 1px solid rgba(107, 124, 143, 0.2);
    font-size: 0.9375rem;
  }

  .nav-link::after {
    top: 0;
    right: auto;
    bottom: 0;
    width: 3px;
    height: auto;
    transform: scaleY(0);
    transform-origin: top;
  }

  .nav-link:hover::after,
  .nav-link:focus-visible::after,
  .nav-link[aria-current="page"]::after {
    transform: scaleY(1);
  }
}

/* ---------- 手机 ---------- */
@media (max-width: 640px) {
  :root {
    --gutter: 20px;
  }

  .brand {
    padding: 12px 14px;
    gap: 10px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 17px;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-coord {
    font-size: 0.5625rem;
    letter-spacing: 0.12em;
  }

  .nav-toggle {
    padding: 0 14px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-bottom: 28px;
  }

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

  .grid-12 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .data-table {
    font-size: 0.8125rem;
  }

  .data-table th,
  .data-table td {
    padding: 8px 9px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scroll-progress {
    transition: none;
  }
}