:root {
  color-scheme: light dark;
  --canvas: #fff7fa;
  --surface: #ffffff;
  --surface-elevated: #ffe8ef;
  --ink: #2c1621;
  --muted: #6e5661;
  --hot: #d4145a;
  --hot-strong: #aa0f48;
  --violet: #6743e8;
  --cyan: #14a9b5;
  --lime: #95c92b;
  --line: #e9d8de;
  --outline: #a8798b;
  --danger: #b3261e;
  --shadow: rgba(103, 67, 232, 0.14);
  --shadow-hot: rgba(212, 20, 90, 0.18);
  --max: 1180px;
  --radius-xl: 2rem;
  --radius-lg: 1.5rem;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6.5rem; }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 28%, rgba(103, 67, 232, .08), transparent 18rem),
    radial-gradient(circle at 94% 55%, rgba(212, 20, 90, .08), transparent 22rem),
    var(--canvas);
  font-family: "Avenir Next", Avenir, "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--hot-strong); text-decoration-thickness: .09em; text-underline-offset: .18em; }
a:hover { color: var(--violet); }
a:focus-visible { outline: 3px solid var(--violet); outline-offset: 4px; border-radius: .35rem; }
.skip-link {
  position: fixed;
  z-index: 200;
  top: .75rem;
  left: .75rem;
  padding: .7rem 1rem;
  color: #fff;
  background: #2c1621;
  border-radius: 999px;
  font-weight: 800;
  transform: translateY(-180%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: none; }
.reading-progress {
  position: fixed;
  z-index: 150;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--hot), var(--violet), var(--cyan), var(--lime));
  transform: scaleX(0);
  transform-origin: left;
}

header {
  position: relative;
  isolation: isolate;
  min-height: min(82svh, 50rem);
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 2rem 1.25rem;
  background:
    radial-gradient(circle at 79% 20%, rgba(184, 243, 74, .35), transparent 17rem),
    radial-gradient(circle at 73% 74%, rgba(20, 198, 207, .2), transparent 20rem),
    linear-gradient(135deg, #fff 0 38%, #ffe8ef 72%, #f2ecff 100%);
  border-bottom: 1px solid rgba(103, 67, 232, .14);
}
header::before {
  content: "";
  position: absolute;
  z-index: -2;
  inset: 0;
  opacity: .34;
  background-image: radial-gradient(rgba(103, 67, 232, .38) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: linear-gradient(90deg, #000, transparent 46%);
}
header::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: clamp(18rem, 42vw, 42rem);
  aspect-ratio: 1;
  right: -12%;
  top: -20%;
  border: clamp(3rem, 7vw, 7rem) solid rgba(255, 255, 255, .48);
  border-radius: 50%;
}
header .wrap {
  position: relative;
  width: min(100%, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(20rem, 1.1fr);
  grid-template-areas:
    "brand art"
    "title art"
    "subtitle art"
    "meta art"
    "nav art";
  gap: 1rem clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.brand-rail {
  grid-area: brand;
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: clamp(1rem, 3vh, 2.4rem);
  color: var(--ink);
  text-decoration: none;
}
.brand-mark {
  position: relative;
  width: 2.55rem;
  height: 2.55rem;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(145deg, var(--hot), #ff688e);
  border: 2px solid #fff;
  border-radius: .85rem;
  box-shadow: .25rem .25rem 0 var(--violet);
  transform: rotate(-6deg);
}
.brand-mark::before { content: "♥"; font-size: 1.15rem; line-height: 1; }
.brand-copy { display: grid; gap: .08rem; line-height: 1; }
.brand-copy strong {
  font-family: ui-rounded, "Avenir Next", Avenir, sans-serif;
  font-size: 1.24rem;
  font-weight: 900;
  letter-spacing: -.045em;
}
.brand-copy small { color: var(--hot-strong); font-size: .63rem; font-weight: 900; letter-spacing: .18em; }
header h1 {
  grid-area: title;
  max-width: 11ch;
  margin: 0;
  font-family: ui-rounded, "Avenir Next Rounded", "Arial Rounded MT Bold", "Noto Sans KR", sans-serif;
  font-size: clamp(2.9rem, 6.4vw, 6.35rem);
  font-weight: 900;
  line-height: .94;
  letter-spacing: -.065em;
  text-wrap: balance;
}
header h1::after {
  content: "";
  display: inline-block;
  width: .22em;
  height: .22em;
  margin-left: .09em;
  background: var(--lime);
  border-radius: 50%;
  box-shadow: .23em -.17em 0 -.04em var(--cyan), -.13em -.24em 0 -.06em var(--violet);
  vertical-align: .08em;
}
.subtitle {
  grid-area: subtitle;
  max-width: 43rem;
  margin: .4rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  line-height: 1.58;
}
.meta { grid-area: meta; display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .7rem; }
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  padding: .46rem .85rem;
  color: var(--ink);
  background: rgba(255, 255, 255, .8);
  border: 1px solid rgba(168, 121, 139, .45);
  border-radius: 999px;
  box-shadow: 0 .45rem 1.4rem rgba(103, 67, 232, .08);
  font-size: .79rem;
  font-weight: 700;
  backdrop-filter: blur(12px);
}
.chip a { color: inherit; }
header nav { grid-area: nav; display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .5rem; }
header nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.85rem;
  padding: .6rem 1rem;
  color: #fff;
  background: var(--hot);
  border: 2px solid var(--hot);
  border-radius: .9rem;
  font-size: .8rem;
  font-weight: 900;
  letter-spacing: .02em;
  text-decoration: none;
  box-shadow: .25rem .25rem 0 rgba(103, 67, 232, .2);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s ease;
}
header nav a:nth-child(even) { color: var(--violet); background: #fff; border-color: var(--violet); }
header nav a:hover { color: #fff; background: var(--violet); border-color: var(--violet); transform: translateY(-3px) rotate(-1deg); box-shadow: .35rem .45rem 0 rgba(212, 20, 90, .16); }
.hero-art {
  grid-area: art;
  position: relative;
  min-width: 0;
  animation: deck-in .85s var(--ease) both;
}
.hero-art img {
  display: block;
  width: min(100%, 46rem);
  height: auto;
  margin-inline: auto;
  filter: drop-shadow(0 2.2rem 2.8rem rgba(103, 67, 232, .2));
  transform: rotate(1.5deg);
}
.hero-sticker {
  position: absolute;
  left: 4%;
  bottom: 8%;
  padding: .7rem 1rem;
  color: #2c1621;
  background: var(--lime);
  border: 2px solid #fff;
  border-radius: .75rem;
  box-shadow: .35rem .35rem 0 var(--violet);
  font-size: clamp(.66rem, 1.3vw, .82rem);
  font-weight: 900;
  letter-spacing: .12em;
  transform: rotate(-7deg);
}

main.wrap {
  width: min(calc(100% - 2.5rem), var(--max));
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 7rem) 0 7rem;
  display: grid;
  grid-template-columns: minmax(12rem, 15rem) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5.5rem);
  align-items: start;
}
.toc-panel {
  position: sticky;
  top: 1.5rem;
  max-height: calc(100svh - 3rem);
  overflow: auto;
  padding: 1.2rem;
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  box-shadow: 0 1.25rem 3rem var(--shadow);
  backdrop-filter: blur(18px);
}
.toc-kicker { margin: 0 0 .9rem; color: var(--hot-strong); font-size: .67rem; font-weight: 900; letter-spacing: .16em; }
.page-toc { margin: 0; padding: 0; list-style: none; counter-reset: toc; }
.page-toc li { counter-increment: toc; margin: 0; padding: 0; }
.page-toc a {
  display: grid;
  grid-template-columns: 1.65rem 1fr;
  gap: .45rem;
  padding: .52rem .35rem;
  color: var(--muted);
  border-radius: .65rem;
  font-size: .78rem;
  line-height: 1.35;
  text-decoration: none;
  transition: color .18s ease, background .18s ease, transform .18s ease;
}
.page-toc a::before { content: counter(toc, decimal-leading-zero); color: var(--outline); font-size: .64rem; font-weight: 900; letter-spacing: .04em; }
.page-toc a:hover, .page-toc a.is-active { color: var(--ink); background: var(--surface-elevated); transform: translateX(3px); }
.page-toc a.is-active::before { color: var(--hot); }
.toc-contact {
  display: block;
  margin-top: 1rem;
  padding: .85rem;
  color: #fff;
  background: var(--violet);
  border-radius: .85rem;
  font-size: .73rem;
  font-weight: 900;
  text-align: center;
  text-decoration: none;
}
.document {
  min-width: 0;
}
.document > section {
  position: relative;
  scroll-margin-top: 2rem;
  margin: 0 0 1.25rem;
  padding: clamp(1.4rem, 3.8vw, 2.4rem);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 1.25rem 3.5rem var(--shadow);
}
.document > section::before {
  content: "";
  position: absolute;
  width: 5.2rem;
  height: 1rem;
  right: -1.1rem;
  top: .8rem;
  background: var(--surface-elevated);
  border: 1px solid var(--line);
  transform: rotate(7deg);
}
.document > section:nth-of-type(3n + 1)::before { background: color-mix(in srgb, var(--violet) 22%, var(--surface)); }
.document > section:nth-of-type(3n + 2)::before { background: color-mix(in srgb, var(--cyan) 26%, var(--surface)); }
.document > section:nth-of-type(3n)::before { background: color-mix(in srgb, var(--lime) 42%, var(--surface)); }
.js .document > section { opacity: 0; transform: translateY(20px) rotate(.25deg); transition: opacity .58s var(--ease), transform .58s var(--ease); }
.js .document > section.is-visible { opacity: 1; transform: none; }
h2 {
  max-width: 27ch;
  margin: 0 0 1rem;
  font-family: ui-rounded, "Avenir Next Rounded", "Arial Rounded MT Bold", "Noto Sans KR", sans-serif;
  font-size: clamp(1.35rem, 3vw, 2.05rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.035em;
}
h3 { margin: 1.6rem 0 .55rem; font-size: 1rem; line-height: 1.4; }
p { margin: .7rem 0 1rem; }
ul, ol { margin: .75rem 0 1rem; padding-left: 1.3rem; }
li { margin: .48rem 0; padding-left: .22rem; }
li::marker { color: var(--hot); font-weight: 900; }
.note {
  margin: 1.2rem 0 .25rem;
  padding: 1rem 1.1rem;
  color: var(--ink);
  background: var(--surface-elevated);
  border: 1px solid color-mix(in srgb, var(--hot) 28%, var(--line));
  border-left: 5px solid var(--hot);
  border-radius: .9rem;
}
code { padding: .15rem .38rem; background: var(--surface-elevated); border-radius: .35rem; }
address { font-style: normal; line-height: 1.55; }
.toc { display: flex; flex-wrap: wrap; gap: .5rem; margin: .7rem 0 0; padding: 0; list-style: none; }
.toc a { display: block; padding: .35rem .6rem; background: var(--surface-elevated); border-radius: .55rem; font-size: .8rem; text-decoration: none; }

footer {
  position: relative;
  overflow: hidden;
  padding: clamp(3rem, 7vw, 5.5rem) 1.25rem;
  color: #fff2f6;
  background:
    radial-gradient(circle at 86% 15%, rgba(103, 67, 232, .45), transparent 24rem),
    linear-gradient(128deg, #2c1621, #4c1232 58%, #26173f);
}
footer::before { content: "♥"; position: absolute; right: 7%; bottom: -5rem; color: rgba(255, 255, 255, .05); font-size: 18rem; line-height: 1; transform: rotate(-12deg); }
footer .wrap { position: relative; width: min(100%, var(--max)); margin: 0 auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem 3rem; }
footer .wrap > div { color: #d0b5c0; font-size: .84rem; }
footer .wrap > div:first-child { color: #fff; font-family: ui-rounded, "Avenir Next Rounded", sans-serif; font-size: 1.25rem; font-weight: 900; }
footer strong { color: #fff2f6; }
footer a { color: #ff9bb2; }

@keyframes deck-in { from { opacity: 0; transform: translateY(30px) rotate(4deg) scale(.95); } }

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #171015;
    --surface: #21171d;
    --surface-elevated: #31212a;
    --ink: #fff2f6;
    --muted: #d0b5c0;
    --hot: #ff6b8b;
    --hot-strong: #ff8fa8;
    --violet: #a890ff;
    --cyan: #69e4e8;
    --lime: #c8f273;
    --line: #563e49;
    --outline: #b98c9f;
    --danger: #ffb4c5;
    --shadow: rgba(0, 0, 0, .28);
    --shadow-hot: rgba(255, 107, 139, .18);
  }
  header {
    background:
      radial-gradient(circle at 79% 20%, rgba(184, 243, 74, .15), transparent 17rem),
      radial-gradient(circle at 73% 74%, rgba(20, 198, 207, .13), transparent 20rem),
      linear-gradient(135deg, #21171d 0 38%, #3a1b2a 72%, #2b2448 100%);
  }
  header::before { opacity: .16; }
  .brand-mark { border-color: #4a3040; }
  .chip { background: rgba(33, 23, 29, .78); }
  header nav a { color: #330613; }
  header nav a:nth-child(even) { color: #f5edff; background: #4d318c; border-color: #a890ff; }
  header nav a:hover { color: #330613; background: var(--lime); border-color: var(--lime); }
  .hero-art img { filter: drop-shadow(0 2.2rem 2.8rem rgba(0, 0, 0, .35)); }
  footer { background: linear-gradient(128deg, #170f14, #361323 58%, #201737); }
}

@media (max-width: 860px) {
  header { min-height: auto; padding-top: 2.5rem; }
  header .wrap {
    grid-template-columns: 1fr;
    grid-template-areas: "brand" "title" "subtitle" "meta" "nav" "art";
  }
  .brand-rail { margin-bottom: 1rem; }
  header h1 { max-width: 13ch; }
  .hero-art { width: min(100%, 36rem); margin: 1rem auto 0; }
  .hero-sticker { left: 1%; }
  main.wrap { grid-template-columns: 1fr; gap: 1.5rem; }
  .toc-panel { position: static; grid-column: 1; max-height: none; }
  .page-toc { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .document { grid-column: 1; }
}

@media (max-width: 520px) {
  body { font-size: 15px; }
  header { padding-inline: 1rem; }
  header h1 { font-size: clamp(2.65rem, 14vw, 4.1rem); }
  .brand-copy strong { font-size: 1.1rem; }
  .meta { gap: .45rem; }
  .chip { font-size: .72rem; }
  header nav a { min-height: 2.65rem; padding: .52rem .8rem; }
  main.wrap { width: min(calc(100% - 1.5rem), var(--max)); padding-top: 2.6rem; }
  .page-toc { grid-template-columns: 1fr; }
  .document > section { border-radius: 1.15rem; }
  footer .wrap { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
  .js .document > section { opacity: 1; transform: none; }
}