@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

:root {
  --mint: #b4fde1;
  --sky: #add8e6;
  --ink: #172620;
  --ink-soft: #26463a;
  --deep: #0f1c17;
  --paper: #f5fffa;
  --paper-2: #ddeffb;
  --text: #dff6ec;
  --text-dim: #b6d8c9;
  --r-lg: 28px;
  --r-md: 20px;
  --r-sm: 14px;
  --clay-out: 8px 10px 0 rgba(0, 0, 0, 0.28);
  --clay-in: inset -3px -4px 10px rgba(23, 38, 32, 0.16), inset 3px 4px 10px rgba(255, 255, 255, 0.9);
}

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

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

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(900px 520px at 82% -8%, #24473b 0%, rgba(23, 38, 32, 0) 62%),
    radial-gradient(700px 400px at 4% 42%, rgba(173, 216, 230, 0.13) 0%, rgba(23, 38, 32, 0) 70%),
    var(--ink);
  color: var(--text);
  font-family: 'EB Garamond', 'Crimson Text', 'Songti SC', 'Noto Serif SC', Georgia, serif;
  font-size: 18px;
  line-height: 1.78;
}

a { color: inherit; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: 3px;
}

/* ---------- top bar ---------- */
.top {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px clamp(14px, 4vw, 32px);
  background: linear-gradient(180deg, #1d332a, #14211b);
  border-bottom: 4px solid var(--mint);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 10px;
  min-height: 44px;
  text-decoration: none;
  color: var(--mint);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  border: 3px solid var(--mint);
  border-radius: 18px;
  background: linear-gradient(160deg, #234034, #16261f);
  box-shadow: var(--clay-in), 4px 5px 0 rgba(0, 0, 0, 0.3);
  transition: transform 200ms ease-out;
}

.brand:active { transform: translateY(2px); }

.mark {
  width: 18px;
  height: 18px;
  border-radius: 7px;
  background: linear-gradient(150deg, var(--mint), var(--sky));
  box-shadow: inset -2px -2px 4px rgba(23, 38, 32, 0.35);
  flex: 0 0 auto;
}

.tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--paper);
  border: 3px solid var(--mint);
  border-radius: 999px;
  padding: 4px 5px 4px 14px;
  box-shadow: var(--clay-in), 4px 5px 0 rgba(0, 0, 0, 0.28);
}

.search input {
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  width: 118px;
  min-height: 34px;
  padding: 0;
}

.search input::placeholder { color: #57806e; }
.search input:focus { outline: none; }

.search button {
  border: 3px solid var(--ink);
  border-radius: 999px;
  background: linear-gradient(160deg, var(--mint), var(--sky));
  color: var(--ink);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 6px 14px;
  min-height: 38px;
  cursor: pointer;
  transition: transform 200ms ease-out;
}

.search button:active { transform: translateY(2px); }

/* ---------- dropdown nav (details > summary + menu) ---------- */
.nav-menu { position: relative; }

.nav-menu summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  min-height: 44px;
  font-weight: 700;
  color: var(--ink);
  border: 3px solid var(--ink);
  border-radius: 18px;
  background: linear-gradient(160deg, var(--sky), #cfeef9);
  box-shadow: var(--clay-in), 5px 6px 0 rgba(0, 0, 0, 0.3);
  transition: transform 200ms ease-out;
}

.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu summary:active { transform: translateY(2px); }

.nav-menu[open] summary {
  background: linear-gradient(160deg, var(--mint), #d8fff0);
}

.panel {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  z-index: 40;
  width: min(300px, calc(100vw - 28px));
  padding: 14px;
  border: 4px solid var(--ink);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, var(--paper), var(--paper-2));
  box-shadow: var(--clay-in), 10px 12px 0 rgba(0, 0, 0, 0.35);
}

.grp {
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
}

.grp + .grp {
  padding-top: 10px;
  border-top: 3px dashed rgba(23, 38, 32, 0.22);
  padding-bottom: 0;
}

.grp li a {
  display: block;
  padding: 11px 14px;
  min-height: 44px;
  border-radius: var(--r-sm);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  transition: background 160ms ease-out, transform 160ms ease-out;
}

.grp li a:hover,
.grp li a:focus-visible {
  background: var(--mint);
  transform: translateX(3px);
}

/* ---------- sticky anchor rail ---------- */
.rail {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 9px clamp(14px, 4vw, 32px);
  background: rgba(14, 26, 21, 0.95);
  border-bottom: 3px solid rgba(180, 253, 225, 0.45);
  backdrop-filter: blur(6px);
}

.rail::-webkit-scrollbar { display: none; }

.rail a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 15px;
  border: 2px solid rgba(180, 253, 225, 0.5);
  border-radius: 999px;
  color: var(--mint);
  text-decoration: none;
  font-size: 0.94rem;
  white-space: nowrap;
  transition: background 180ms ease-out, color 180ms ease-out;
}

.rail a:hover,
.rail a:focus-visible {
  background: var(--mint);
  color: var(--ink);
  border-color: var(--mint);
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 45vh;
  display: flex;
  align-items: center;
  padding: clamp(18px, 3vw, 32px) clamp(16px, 4vw, 32px) clamp(28px, 4vw, 46px);
  background: radial-gradient(640px 320px at 86% 26%, rgba(173, 216, 230, 0.2), rgba(23, 38, 32, 0) 72%);
}

.hero-in {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 160px;
  align-items: center;
  gap: clamp(16px, 3vw, 30px);
}

.hero-txt { text-align: right; }

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.9rem, 5.6vw, 3.3rem);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: #f2fffa;
  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.32);
}

.lede {
  margin: 0 0 0 auto;
  max-width: 46ch;
  color: var(--text-dim);
  font-size: 1rem;
}

.hero-art {
  justify-self: end;
  display: flex;
  justify-content: center;
  will-change: transform;
}

.blob {
  display: block;
  width: 130px;
  height: 130px;
  border-radius: 62% 38% 55% 45% / 48% 52% 48% 52%;
  background: linear-gradient(150deg, var(--mint), var(--sky));
  border: 4px solid #eafff6;
  box-shadow: var(--clay-in), var(--clay-out);
}

.hero-photo {
  display: block;
  width: 148px;
  height: auto;
  border: 4px solid #eafff6;
  border-radius: 26px;
  box-shadow: var(--clay-in), var(--clay-out);
}

.band {
  position: absolute;
  left: -4%;
  right: -4%;
  bottom: -10px;
  height: 20px;
  border-radius: 14px;
  background: linear-gradient(90deg, var(--mint), var(--sky) 62%, var(--mint));
  transform: skewY(-1.3deg);
}

/* ---------- main / wrap / aside / article ---------- */
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 30px clamp(14px, 4vw, 28px) 56px;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.side {
  position: sticky;
  top: 66px;
}

.clay {
  color: var(--ink);
  background: linear-gradient(163deg, var(--paper), var(--paper-2));
  border: 4px solid var(--mint);
  border-bottom: 10px solid var(--sky);
  border-radius: var(--r-lg);
  box-shadow: var(--clay-in), var(--clay-out);
}

.side-card { padding: 16px 14px 18px; }

.side-t {
  margin: 0 0 10px;
  font-size: 0.86rem;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
  text-transform: none;
  border-bottom: 3px solid rgba(23, 38, 32, 0.16);
  padding-bottom: 8px;
}

.toc {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.toc li + li { margin-top: 4px; }

.toc a {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 42px;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  text-decoration: none;
  color: var(--ink);
  font-size: 0.96rem;
  line-height: 1.4;
  transition: background 160ms ease-out, transform 160ms ease-out;
}

.toc a:hover,
.toc a:focus-visible {
  background: var(--mint);
  transform: translateX(2px);
}

.toc .num {
  flex: 0 0 auto;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #4d7565;
  background: rgba(173, 216, 230, 0.55);
  border-radius: 8px;
  padding: 2px 6px;
}

.col { min-width: 0; }

.prose {
  padding: clamp(20px, 3.4vw, 36px);
  font-size: 1rem;
  word-break: break-word;
}

.prose > div { scroll-margin-top: 112px; }

.prose > div + div {
  margin-top: 34px;
  padding-top: 30px;
  border-top: 4px dashed rgba(23, 38, 32, 0.18);
}

.prose h2 {
  margin: 0 0 14px;
  font-size: clamp(1.36rem, 3.4vw, 1.86rem);
  line-height: 1.28;
  color: var(--ink);
  font-weight: 800;
}

.prose h2 > span {
  display: inline;
  background: linear-gradient(transparent 64%, rgba(180, 253, 225, 0.95) 64%);
  padding: 0 2px;
}

.prose h3 {
  margin: 26px 0 10px;
  font-size: 1.16rem;
  line-height: 1.42;
  color: var(--ink);
  font-weight: 700;
}

.prose h3 > span {
  display: inline;
  border-bottom: 3px solid rgba(173, 216, 230, 0.9);
  padding-bottom: 1px;
}

.prose p { margin: 0 0 15px; }
.prose p:last-child { margin-bottom: 0; }

.prose ul,
.prose ol {
  margin: 0 0 16px;
  padding-left: 1.35em;
}

.prose li { margin-bottom: 7px; }

.prose a {
  color: #10493a;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.prose a:hover { background: rgba(180, 253, 225, 0.7); }

.prose strong { color: #0d2a22; }

.prose img,
.prose video,
.prose iframe {
  max-width: 100%;
  height: auto;
  display: block;
  border: 4px solid var(--mint);
  border-radius: var(--r-md);
  box-shadow: var(--clay-in);
  margin: 6px 0 18px;
}

.prose figure { margin: 0 0 18px; }

.prose figcaption {
  font-size: 0.9rem;
  color: #3f6355;
  text-align: right;
}

.prose blockquote {
  margin: 0 0 18px;
  padding: 14px 18px;
  border: 4px solid var(--sky);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--clay-in);
}

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

.prose table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  border: 3px solid rgba(23, 38, 32, 0.28);
  padding: 9px 12px;
  text-align: left;
}

.prose th { background: rgba(180, 253, 225, 0.7); }

.prose code {
  font-family: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: rgba(173, 216, 230, 0.5);
  border-radius: 7px;
  padding: 1px 6px;
}

.prose hr {
  border: 0;
  border-top: 4px dashed rgba(23, 38, 32, 0.2);
  margin: 24px 0;
}

/* ---------- footer ---------- */
footer {
  border-top: 4px solid var(--mint);
  background: #101d18;
  padding: 28px clamp(16px, 4vw, 32px) 22px;
}

.fgrid {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.fgrid dl { margin: 0; }

.fgrid dt {
  color: var(--mint);
  font-size: 0.86rem;
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.fgrid dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-dim);
}

.fgrid dd a {
  display: inline-block;
  padding: 8px 0;
  min-height: 42px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.fgrid dd a:hover,
.fgrid dd a:focus-visible { border-bottom-color: var(--mint); }

.fbar {
  max-width: 1080px;
  margin: 20px auto 0;
  padding-top: 14px;
  border-top: 3px dashed rgba(180, 253, 225, 0.3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-dim);
}

.copy { margin: 0; }

.flinks {
  margin: 0;
  display: flex;
  gap: 8px;
}

.flinks a {
  display: inline-block;
  padding: 10px 14px;
  min-height: 42px;
  border: 2px solid rgba(180, 253, 225, 0.45);
  border-radius: 999px;
  text-decoration: none;
  color: var(--mint);
  transition: background 180ms ease-out, color 180ms ease-out;
}

.flinks a:hover,
.flinks a:focus-visible {
  background: var(--mint);
  color: var(--ink);
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .stagger > div {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease-out, transform 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .stagger > div.in {
    opacity: 1;
    transform: none;
  }

  .hero-art .blob { animation: floaty 7s ease-in-out infinite; }

  @keyframes floaty {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .wrap {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 22px;
    gap: 20px;
  }

  .side {
    position: static;
    order: 2;
  }

  .toc {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .toc li + li { margin-top: 0; }

  .hero { min-height: 0; }

  .hero-in {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .hero-art { order: 2; justify-self: end; }

  .hero-photo { width: 118px; }

  .blob { width: 104px; height: 104px; }
}

@media (max-width: 640px) {
  body { font-size: 17px; }

  .top { gap: 10px; }

  .tools {
    width: 100%;
    margin-left: 0;
  }

  .search { flex: 1 1 auto; }
  .search input { width: 100%; }

  .panel { right: auto; left: 0; }

  .fgrid { grid-template-columns: minmax(0, 1fr); gap: 14px; }

  .fbar { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 400px) {
  .toc { grid-template-columns: minmax(0, 1fr); }
}

button[aria-expanded]{min-width:44px;min-height:44px}