:root {
  color-scheme: light;
  --paper: #f2eee4;
  --paper-deep: #e7e0d2;
  --ink: #1d211f;
  --muted: #646964;
  --line: #cfc7b8;
  --panel: rgba(255, 253, 247, 0.72);
  --accent: #d95d32;
  --accent-dark: #a83f1e;
  --display: #202321;
  --display-ink: #f8f4e8;
  --focus: #176b87;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(49, 43, 34, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 2%, rgba(217, 93, 50, 0.08), transparent 28rem),
    linear-gradient(180deg, var(--paper) 0%, #f8f5ed 60%, var(--paper) 100%);
  font-size: 16px;
  line-height: 1.72;
}

a {
  color: var(--accent-dark);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 65%, white);
  outline-offset: 4px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.85rem;
  color: white;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-180%);
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(84, 79, 68, 0.16);
  background: rgba(242, 238, 228, 0.88);
  backdrop-filter: blur(18px) saturate(130%);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 2rem));
  min-height: 64px;
  margin-inline: auto;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 750;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: var(--display-ink);
  background: var(--display);
  border-radius: 8px;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.72rem;
  font-weight: 700;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.1);
}

.brand-mark::after {
  position: absolute;
  right: 3px;
  left: 3px;
  top: 50%;
  height: 1px;
  content: "";
  background: rgba(255, 255, 255, 0.24);
}

.nav-links {
  display: flex;
  margin: 0;
  padding: 0;
  gap: 0.15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a {
  display: block;
  padding: 0.45rem 0.65rem;
  color: var(--muted);
  border-radius: 8px;
  font-size: 0.88rem;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.62);
}

.hero {
  width: min(1040px, calc(100% - 2rem));
  margin: clamp(2.5rem, 8vw, 6rem) auto clamp(2rem, 6vw, 4rem);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(2.35rem, 8vw, 5rem);
  font-weight: 780;
}

h2 {
  margin: 3rem 0 1rem;
  font-size: clamp(1.4rem, 3.8vw, 2rem);
  scroll-margin-top: 88px;
}

h3 {
  margin: 2rem 0 0.65rem;
  font-size: 1.08rem;
}

.lede {
  max-width: 700px;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 2.5vw, 1.28rem);
  line-height: 1.65;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  margin: 1.3rem 0 0;
  padding: 0;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.84rem;
  list-style: none;
}

.meta li {
  padding: 0.28rem 0.62rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.38);
}

.layout {
  display: grid;
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto clamp(4rem, 10vw, 8rem);
  gap: 2.5rem;
}

.toc {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.toc-title {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.toc ol {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 0.2rem;
  list-style: none;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
}

.toc a {
  display: grid;
  grid-template-columns: 1.7rem 1fr;
  padding: 0.35rem;
  color: var(--muted);
  border-radius: 6px;
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
}

.toc a::before {
  color: var(--accent);
  content: counter(toc, decimal-leading-zero);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.72rem;
}

.toc a:hover {
  color: var(--ink);
  background: rgba(217, 93, 50, 0.07);
}

.document {
  min-width: 0;
}

.document > :first-child {
  margin-top: 0;
}

.document p,
.document li {
  max-width: 76ch;
}

.document ul,
.document ol {
  padding-left: 1.35rem;
}

.document li + li {
  margin-top: 0.55rem;
}

.notice,
.summary-card {
  padding: clamp(1.1rem, 4vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.notice {
  border-left: 4px solid var(--accent);
}

.notice strong {
  display: block;
  margin-bottom: 0.25rem;
}

.summary-grid,
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.summary-card h2,
.summary-card h3 {
  margin-top: 0;
}

.summary-card p:last-child,
.notice p:last-child {
  margin-bottom: 0;
}

.data-table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.36);
}

.data-table table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  color: var(--muted);
  background: rgba(231, 224, 210, 0.55);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.steps {
  padding-left: 0 !important;
  list-style: none;
  counter-reset: steps;
}

.steps li {
  position: relative;
  min-height: 2.2rem;
  padding-left: 3rem;
  counter-increment: steps;
}

.steps li::before {
  position: absolute;
  left: 0;
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--display-ink);
  background: var(--display);
  border-radius: 7px;
  content: counter(steps);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.8rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  margin-top: 1.35rem;
  gap: 0.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1rem;
  color: white;
  background: var(--accent-dark);
  border: 1px solid var(--accent-dark);
  border-radius: 10px;
  font-weight: 650;
  text-decoration: none;
}

.button:hover {
  color: white;
  background: var(--accent);
}

.button.secondary {
  color: var(--ink);
  background: transparent;
  border-color: var(--line);
}

.button.secondary:hover {
  color: var(--accent-dark);
  background: rgba(255, 255, 255, 0.55);
}

.contact-box {
  padding: clamp(1.25rem, 4vw, 2rem);
  color: var(--display-ink);
  background: var(--display);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contact-box h2,
.contact-box h3,
.contact-box a {
  color: inherit;
}

.contact-box h2,
.contact-box h3 {
  margin-top: 0;
}

.contact-box p {
  color: #c9ccc6;
}

.site-footer {
  padding: 2rem 1rem 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.84rem;
}

.site-footer nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 0.65rem;
  gap: 0.5rem 1rem;
}

.site-footer p {
  margin: 0;
}

.landing-hero {
  display: grid;
  min-height: calc(100svh - 65px);
  align-content: center;
}

.landing-hero h1 {
  max-width: 18ch;
}

.clock-display {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 1.25rem;
  padding: 0.5rem;
  gap: 0.35rem;
  background: #cc5a34;
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(132, 51, 25, 0.25);
}

.clock-display span {
  position: relative;
  display: grid;
  width: clamp(3.1rem, 16vw, 5.5rem);
  aspect-ratio: 0.78;
  place-items: center;
  overflow: hidden;
  color: var(--display-ink);
  background: var(--display);
  border-radius: 9px;
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: clamp(2.2rem, 10vw, 4.6rem);
  font-weight: 500;
  letter-spacing: -0.08em;
}

.clock-display span::after {
  position: absolute;
  right: 0;
  left: 0;
  top: 50%;
  height: 1px;
  content: "";
  background: #070807;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.landing-grid {
  display: grid;
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto clamp(4rem, 10vw, 8rem);
  gap: 1rem;
}

.landing-card {
  display: flex;
  min-height: 190px;
  padding: 1.4rem;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  flex-direction: column;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.landing-card:hover {
  color: var(--ink);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.landing-card .number {
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.76rem;
}

.landing-card h2 {
  margin: auto 0 0.35rem;
}

.landing-card p {
  margin: 0;
  color: var(--muted);
}

@media (min-width: 680px) {
  .nav {
    min-height: 72px;
  }

  .nav-links a {
    padding-inline: 0.8rem;
    font-size: 0.92rem;
  }

  .summary-grid,
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
    gap: clamp(3rem, 7vw, 6rem);
  }

  .toc {
    position: sticky;
    top: 96px;
  }
}

@media (max-width: 520px) {
  .brand-text {
    display: none;
  }

  .nav {
    width: calc(100% - 1rem);
  }

  .hero,
  .layout,
  .landing-grid {
    width: min(100% - 1.35rem, 1040px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #171917;
    --paper-deep: #222521;
    --ink: #f0ede4;
    --muted: #aeb3ac;
    --line: #3b403b;
    --panel: rgba(35, 38, 34, 0.78);
    --accent: #f17b50;
    --accent-dark: #f18b64;
    --display: #080908;
    --display-ink: #f6f2e7;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.2);
  }

  body {
    background:
      radial-gradient(circle at 12% 2%, rgba(217, 93, 50, 0.12), transparent 28rem),
      linear-gradient(180deg, var(--paper) 0%, #1b1e1b 60%, var(--paper) 100%);
  }

  .site-header {
    background: rgba(23, 25, 23, 0.88);
  }

  .nav-links a:hover,
  .nav-links a[aria-current="page"] {
    background: rgba(255, 255, 255, 0.08);
  }

  .data-table,
  .data-table th {
    background: rgba(255, 255, 255, 0.035);
  }
}

@media print {
  :root {
    color-scheme: light;
    --paper: #fff;
    --ink: #111;
    --muted: #444;
    --line: #bbb;
    --panel: #fff;
  }

  body {
    background: white;
    font-size: 11pt;
  }

  .site-header,
  .toc,
  .site-footer,
  .button-row {
    display: none;
  }

  .hero,
  .layout {
    width: 100%;
    margin: 0;
  }

  .hero {
    margin-bottom: 1.5rem;
  }

  .layout {
    display: block;
  }

  h1 {
    font-size: 30pt;
  }

  h2 {
    break-after: avoid;
  }

  a {
    color: inherit;
  }
}