:root {
  --deep-slate: #1E2530;
  --cream: #F5EBDD;
  --light-gray: #E8EAED;
  --signal-orange: #FF8C42;
  --teal: #38A3A5;
  --violet: #7B5EA7;
  --update-green: #5EDC4C;
  --alert-red: #E63946;
  --amber: #F4C542;
  --signal-green: #2A9D8F;
  --ink: #0F1115;
  --paper: #FFFDF7;
  --font-head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  background: var(--paper);
  color: var(--ink);
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  color: var(--ink);
}

a {
  color: var(--teal);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

a:hover {
  color: var(--signal-orange);
}

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

button {
  font: inherit;
  letter-spacing: 0.02em;
}

ul, ol {
  list-style: none;
}

:focus-visible {
  outline: 4px solid var(--signal-orange);
  outline-offset: 2px;
}

#main-content {
  scroll-margin-top: 24px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 2000;
  padding: 10px 14px;
  background: var(--signal-orange);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-weight: 900;
  text-decoration: none;
  transform: translateY(-200%);
  box-shadow: 4px 4px 0 var(--deep-slate);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 1200;
  background: var(--signal-orange);
  transform: scaleX(0);
  transform-origin: 0 0;
  pointer-events: none;
}

.site-header {
  position: relative;
  z-index: 500;
  background: var(--deep-slate);
}

.header-top {
  background: var(--deep-slate);
  border-bottom: 4px solid var(--amber);
}

.header-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--paper);
  text-decoration: none;
}

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

.brand-mark {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--signal-orange);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 28px;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--teal);
}

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

.brand-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 26px;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--paper);
}

.brand-subtitle {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.72);
}

.header-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-left: auto;
}

.header-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  font-family: var(--font-data);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--update-green);
}

.header-note strong {
  color: var(--update-green);
  font-weight: 700;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--update-green);
  box-shadow: 0 0 0 3px rgba(94, 220, 76, 0.2);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--signal-orange);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--teal);
  cursor: pointer;
  font-weight: 900;
  line-height: 1.2;
}

.nav-toggle-line {
  width: 20px;
  height: 3px;
  background: currentColor;
}

.nav-toggle-text {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.header-bottom {
  background: var(--paper);
  border-bottom: 4px solid var(--ink);
}

.main-nav {
  max-width: 1280px;
  margin: 0 auto;
}

.nav-list {
  display: flex;
  align-items: stretch;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 54px;
  padding: 0 20px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-left: 1px solid var(--light-gray);
}

.nav-link:hover {
  background: var(--signal-orange);
  color: var(--ink);
}

.nav-link[aria-current="page"] {
  background: var(--ink);
  color: var(--paper);
  box-shadow: inset 0 -4px 0 var(--signal-orange);
}

.page-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 48px 0;
}

.section-head {
  max-width: 1280px;
  margin: 0 auto 24px;
  padding: 0 24px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.section-kicker {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  margin: 4px 0 0;
}

.surface-cream {
  background: var(--cream);
}

.surface-gray {
  background: var(--light-gray);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0;
  font-family: var(--font-data);
  font-size: 13px;
}

.breadcrumbs a {
  color: var(--teal);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--signal-orange);
}

.layout-split {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.layout-sidebar {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 16px;
  padding: 20px;
  background: var(--cream);
  border: 2px solid var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
  background: transparent;
  border: 2px solid var(--ink);
  text-decoration: none;
  cursor: pointer;
}

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

.btn-primary {
  background: var(--signal-orange);
}

.btn-primary:hover {
  background: var(--ink);
  color: var(--signal-orange);
}

.btn-secondary {
  background: var(--paper);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background: var(--paper);
  border: 2px solid var(--ink);
}

.card__media {
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-gray);
  border-bottom: 2px solid var(--ink);
}

.card__body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  padding: 16px;
}

.card__title {
  font-size: 18px;
  font-weight: 900;
  margin: 0;
}

.card__text {
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
  opacity: 0.82;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 16px;
}

.tile {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  min-height: 130px;
  padding: 18px;
  background: var(--signal-orange);
  color: var(--ink);
  border: 2px solid var(--ink);
}

.tile--teal {
  background: var(--teal);
}

.tile--violet {
  background: var(--violet);
  color: var(--paper);
}

.tile--amber {
  background: var(--amber);
}

.tile--gray {
  background: var(--light-gray);
}

.tile__name {
  font-size: 18px;
  font-weight: 900;
}

.tile__count {
  align-self: flex-start;
  padding: 4px 8px;
  font-family: var(--font-data);
  font-size: 12px;
  background: var(--ink);
  color: var(--paper);
}

.item-list {
  border-top: 3px solid var(--ink);
}

.item-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 14px 8px;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}

.item-row:hover {
  background: var(--cream);
}

.item-rank {
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-orange);
}

.item-body {
  min-width: 0;
}

.item-title {
  font-size: 18px;
  font-weight: 900;
  margin: 0;
}

.item-meta {
  margin-top: 4px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--violet);
}

.item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  text-decoration: none;
}

.tag:hover {
  background: var(--ink);
  color: var(--paper);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--ink);
}

.badge--green {
  background: var(--signal-green);
  color: var(--ink);
}

.badge--amber {
  background: var(--amber);
  color: var(--ink);
}

.badge--red {
  background: var(--alert-red);
  color: var(--paper);
}

.badge--orange {
  background: var(--signal-orange);
  color: var(--ink);
}

.badge--teal {
  background: var(--teal);
  color: var(--ink);
}

.badge--violet {
  background: var(--violet);
  color: var(--paper);
}

.index-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 6px;
  font-family: var(--font-data);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  background: var(--ink);
}

.index-badge--hot {
  background: var(--signal-orange);
  color: var(--ink);
}

.index-badge--top {
  background: var(--violet);
  color: var(--paper);
}

.metric {
  display: grid;
  gap: 6px;
}

.metric__label {
  font-size: 12px;
  font-weight: 700;
  opacity: 0.7;
}

.metric-bar {
  height: 12px;
  background: var(--light-gray);
  border: 1px solid var(--ink);
}

.metric-bar__fill {
  height: 100%;
  width: calc(var(--value, 0) * 1%);
  background: var(--signal-orange);
}

.metric-bar__fill--teal {
  background: var(--teal);
}

.metric-bar__fill--violet {
  background: var(--violet);
}

.metric-bar__fill--green {
  background: var(--update-green);
}

.index-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-data);
  font-size: 13px;
}

.index-bar__track {
  flex: 1;
  height: 8px;
  background: var(--light-gray);
  border: 1px solid var(--ink);
}

.index-bar__fill {
  display: block;
  height: 100%;
  width: calc(var(--value, 0) * 1%);
  background: var(--signal-green);
}

.rail {
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-color: var(--deep-slate) var(--light-gray);
}

.rail__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 38%);
  gap: 16px;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--paper);
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--ink);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  background: var(--deep-slate);
  color: var(--paper);
  font-weight: 900;
}

.compare-table td.diff {
  background: var(--amber);
  font-weight: 700;
}

.compare-table tbody tr:hover td {
  background: var(--cream);
}

.segmented-control {
  display: inline-flex;
  background: var(--paper);
  border: 2px solid var(--ink);
}

.segmented-control__btn {
  padding: 8px 14px;
  border: 0;
  background: transparent;
  font-weight: 700;
  cursor: pointer;
}

.segmented-control__btn + .segmented-control__btn {
  border-left: 2px solid var(--ink);
}

.segmented-control__btn[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.figure {
  margin: 0;
}

.figure__placeholder {
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 12px;
  border: 2px solid var(--ink);
  background:
    linear-gradient(90deg, var(--deep-slate) 0 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(var(--deep-slate) 0 1px, transparent 1px) 0 0 / 28px 28px,
    var(--light-gray);
}

.figure__placeholder::after {
  content: "图位";
  padding: 4px 8px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
}

[data-reveal] {
  --reveal-delay: 0s;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: var(--reveal-delay);
}

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

.site-footer {
  margin-top: 80px;
  background: var(--deep-slate);
  color: var(--paper);
  border-top: 6px solid var(--signal-orange);
}

.footer-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 24px 0;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-brand .brand-name {
  color: var(--paper);
  font-size: 30px;
}

.footer-brand .brand-subtitle {
  color: rgba(255, 255, 255, 0.68);
}

.footer-heading {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--signal-orange);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 16px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--signal-orange);
}

.contact-list {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 960px) {
  .layout-split {
    grid-template-columns: 1fr;
  }

  .layout-sidebar {
    position: static;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .header-grid {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-bottom {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 0;
    overflow: visible;
    background: transparent;
    border: 0;
  }

  .main-nav {
    position: absolute;
    top: 0;
    left: 12px;
    right: 12px;
    z-index: 300;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    background: var(--paper);
    border: 2px solid var(--ink);
    border-top-width: 4px;
    box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.18);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s ease;
  }

  .main-nav[data-nav][data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    padding: 8px;
  }

  .nav-link {
    min-height: 48px;
    padding: 12px 16px;
    border-left: 0;
    border-top: 1px solid var(--light-gray);
  }
}

@media (max-width: 760px) {
  .header-notes {
    display: none;
  }
}

@media (max-width: 600px) {
  .header-grid {
    padding: 14px 16px;
  }

  .footer-shell {
    padding: 36px 16px 0;
  }

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

  .rail__track {
    grid-auto-columns: minmax(240px, 88%);
  }

  .item-row {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .item-tags {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }
}

@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;
  }

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