:root {
  --paper: #fbf9f4;
  --paper-deep: #efebe1;
  --card: #ffffff;
  --card-edge: #e6e1d6;
  --accent: #f2b33d;
  --accent-soft: #fad780;
  --accent-pale: #fdf0ce;
  --on-accent: #4a3410;
  --on-accent-pale: #4a3410;
  --mint: #a8cfc0;
  --sky: #a9c8e4;
  --lilac: #c9b6e4;
  --butter: #f7c89b;
  --ink: #5e4a3c;
  --ink-soft: #9a8574;
  --ink-faint: #c0ae9c;
  --soft-shadow: #c4a874;
  --paper-glow: #ffffff;
  --paper-vignette: #e4dfd4;
  --danger: #e8695e;
  --radius: 22px;
  --font-hand: "ZCOOL KuaiLe", "ZCOOL XiaoWei", "PingFang SC", "Hiragino Sans GB", cursive;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #211a14;
    --paper-deep: #14100b;
    --card: #32291f;
    --card-edge: #4a3c2c;
    --accent: #e0a73e;
    --accent-soft: #9a7838;
    --accent-pale: #3b2f1c;
    --on-accent: #3a280c;
    --on-accent-pale: #f0e4d2;
    --mint: #7fae9d;
    --sky: #7fa6c6;
    --lilac: #a692c6;
    --butter: #d6a375;
    --ink: #f0e4d2;
    --ink-soft: #b9a894;
    --ink-faint: #7c6c5c;
    --soft-shadow: #000000;
    --paper-glow: #3e3125;
    --paper-vignette: #120e09;
  }
}

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

html {
  scroll-behavior: smooth;
  color-scheme: light dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--accent);
  color: var(--on-accent);
  padding: 8px 14px;
  border-radius: 999px;
  z-index: 20;
}

.skip:focus {
  left: 12px;
}

/* ---------- paper stage ---------- */

.stage {
  position: relative;
  min-height: 100vh;
  overflow: clip;
}

.paper-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(420px 420px at 30% 12%, color-mix(in srgb, var(--paper-glow) 60%, transparent), transparent 70%),
    radial-gradient(620px 620px at 50% 50%, transparent 40%, color-mix(in srgb, var(--paper-vignette) 80%, transparent) 100%),
    var(--paper);
}

.paper-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

@media (prefers-color-scheme: dark) {
  .paper-bg::after {
    mix-blend-mode: overlay;
    opacity: 0.18;
  }
}

.orb {
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  filter: blur(8px);
  animation: drift 8s ease-in-out forwards;
}

.orb-a {
  background: radial-gradient(circle, color-mix(in srgb, var(--mint) 26%, transparent), transparent 70%);
  top: -230px;
  left: -110px;
}

.orb-b {
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-soft) 26%, transparent), transparent 70%);
  top: 120px;
  right: -80px;
  animation-duration: 10s;
}

@keyframes drift {
  to {
    transform: translate(18px, -22px);
  }
}

#doodles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.45;
}

.wrap {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 18px 0 72px;
}

/* ---------- nav ---------- */

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  box-shadow: 0 4px 10px color-mix(in srgb, var(--soft-shadow) 28%, transparent);
  background: #f7c48a;
}

.brand-name {
  font-family: var(--font-hand);
  font-size: 22px;
  color: var(--ink);
  line-height: 1;
}

.brand-sub {
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 3px;
}

.nav-links {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.nav-links a {
  font-family: var(--font-hand);
  font-size: 15px;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--on-accent);
  background: var(--accent-pale);
}

/* ---------- paper cards ---------- */

.sheet {
  position: relative;
  background: var(--card);
  border: 1.4px solid var(--card-edge);
  border-radius: var(--radius);
  box-shadow: 0 5px 14px color-mix(in srgb, var(--soft-shadow) 28%, transparent);
  padding: 18px 16px;
  margin-bottom: 16px;
}

.sheet::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

@media (prefers-color-scheme: dark) {
  .sheet::after {
    mix-blend-mode: overlay;
    opacity: 0.12;
  }
}

.sheet > * {
  position: relative;
  z-index: 1;
}

/* ---------- washi tape ---------- */

.tape {
  position: absolute;
  z-index: 2;
  height: 18px;
  background:
    repeating-linear-gradient(
      90deg,
      color-mix(in srgb, var(--tape) 72%, transparent) 0 6px,
      color-mix(in srgb, white 38%, var(--tape)) 6px 7px
    );
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.1);
  opacity: 0.92;
  pointer-events: none;
}

.tape-l {
  --tape: var(--accent-soft);
  width: 70px;
  top: -9px;
  left: 10px;
  transform: rotate(-17deg);
}

.tape-r {
  --tape: var(--mint);
  width: 58px;
  top: -8px;
  right: 10px;
  transform: rotate(13deg);
}

.tape-mint {
  --tape: var(--mint);
}

.tape-butter {
  --tape: var(--butter);
}

/* ---------- hero / legal head ---------- */

.hero {
  text-align: center;
  padding: 28px 16px 24px;
}

.mascot {
  width: 86px;
  height: 86px;
  margin: 0 auto 8px;
  border-radius: 28px;
  transform: rotate(-6deg);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--soft-shadow) 32%, transparent);
  background: #f7c48a;
}

.hand-title {
  font-family: var(--font-hand);
  font-size: clamp(26px, 5vw, 32px);
  margin: 8px 0 0;
  color: var(--ink);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.squiggle {
  display: block;
  width: 84px;
  height: 8px;
  margin: 6px auto 0;
}

.lead {
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.75;
  margin: 10px 0 0;
}

.meta {
  color: var(--ink-faint);
  font-size: 12px;
  margin: 6px 0 0;
}

.legal-head {
  padding: 20px 16px 18px;
}

.legal-head .hand-title {
  text-align: left;
  font-size: 26px;
}

.legal-head .lead {
  margin-top: 12px;
}

/* ---------- toc ---------- */

.toc-title,
.section-title,
.card-title {
  font-family: var(--font-hand);
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 10px;
}

.toc-title {
  font-size: 18px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.toc-list a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 8px;
  align-items: baseline;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
}

.toc-list a:hover {
  color: var(--ink);
}

.toc-num {
  color: var(--accent);
  font-size: 13px;
  text-align: right;
}

/* ---------- sections ---------- */

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.badge {
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--on-accent);
  font-weight: 700;
  font-size: 13px;
  display: grid;
  place-items: center;
  margin-top: 2px;
}

.section-title {
  font-size: 18px;
  margin: 0;
  line-height: 1.35;
}

.prose p {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.85;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose h3 {
  font-family: var(--font-hand);
  font-size: 16px;
  font-weight: 400;
  color: var(--ink);
  margin: 16px 0 6px;
}

.prose ul,
.prose ol {
  margin: 0 0 10px;
  padding-left: 1.2em;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.85;
}

/* ---------- callout ---------- */

.callout {
  margin-top: 12px;
  padding: 12px;
  border-radius: 16px;
  background: var(--accent-pale);
  color: color-mix(in srgb, var(--on-accent-pale) 88%, transparent);
  font-size: 13px;
  line-height: 1.7;
  border: 1.6px dashed var(--accent-soft);
}

.callout a {
  color: var(--on-accent-pale);
}

/* ---------- tables ---------- */

.table-caption {
  font-family: var(--font-hand);
  font-size: 15px;
  color: var(--ink);
  margin: 12px 0 8px;
}

.info-table {
  margin-top: 8px;
  padding: 4px 2px 2px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--accent-pale) 55%, transparent);
  border: 1px solid var(--card-edge);
  overflow: hidden;
}

.info-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.info-table th,
.info-table td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  color: var(--ink-soft);
}

.info-table th {
  color: var(--ink-faint);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.info-table tbody tr + tr {
  border-top: 1.2px dashed var(--card-edge);
}

@media (max-width: 720px) {
  .info-table table,
  .info-table thead,
  .info-table tbody,
  .info-table tr,
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table thead {
    display: none;
  }

  .info-table tr {
    padding: 10px 12px;
  }

  .info-table td {
    padding: 2px 0 8px;
  }

  .info-table td::before {
    content: attr(data-label);
    display: block;
    color: var(--ink-faint);
    font-size: 11px;
    margin-bottom: 2px;
  }
}

/* ---------- tail / footer ---------- */

.tail {
  text-align: center;
  padding: 8px 0 0;
  color: var(--ink-soft);
}

.tail .hand {
  font-family: var(--font-hand);
  font-size: 15px;
  margin: 0 0 4px;
}

.tail a {
  color: var(--accent);
  font-size: 13px;
}

.site-foot {
  text-align: center;
  color: var(--ink-faint);
  font-family: var(--font-hand);
  font-size: 13px;
  padding: 8px 0 24px;
}

/* ---------- landing extras ---------- */

.highlights {
  display: grid;
  gap: 12px;
}

.highlight {
  display: flex;
  gap: 13px;
  align-items: flex-start;
}

.highlight-icon {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  font-size: 21px;
}

.highlight h3 {
  font-family: var(--font-hand);
  font-size: 18px;
  margin: 0 0 3px;
  font-weight: 400;
}

.highlight p {
  margin: 0;
  font-size: 12px;
  color: var(--ink-soft);
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font-hand);
  font-size: 18px;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 999px;
  width: 100%;
  box-shadow: 0 4px 10px color-mix(in srgb, var(--soft-shadow) 30%, transparent);
}

.cta:hover {
  color: var(--on-accent);
  filter: brightness(0.97);
}

.back-top {
  position: fixed;
  right: 16px;
  bottom: 18px;
  z-index: 5;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: var(--card);
  color: var(--ink);
  box-shadow: 0 5px 12px color-mix(in srgb, var(--soft-shadow) 32%, transparent);
  cursor: pointer;
  font-size: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.back-top.show {
  opacity: 1;
  pointer-events: auto;
}

@media print {
  .paper-bg,
  #doodles,
  .orb,
  .tape,
  .nav-links,
  .back-top {
    display: none !important;
  }

  body {
    background: white;
    color: #222;
  }

  .sheet {
    box-shadow: none;
    break-inside: avoid;
  }

  a {
    color: inherit;
  }
}