:root {
  --paper: #f5f0e6;
  --ink: #252723;
  --muted: #6e706a;
  --accent: #a55f50;
  --footer: #87a9c0;
  --header-height: 104px;
  --side: clamp(24px, 4.2vw, 68px);
  --display: "Noto Serif KR", "Nanum Myeongjo", Georgia, serif;
  --body: "Pretendard", "Noto Sans KR", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 0%, rgba(255,255,255,.75), transparent 34%),
    var(--paper);
  font-family: var(--body);
  min-width: 320px;
}

button, a { color: inherit; }
button { font: inherit; }

.paper-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  opacity: .22;
  mix-blend-mode: multiply;
  background-image:
    repeating-radial-gradient(circle at 20% 30%, rgba(70,60,45,.06) 0 1px, transparent 1px 5px);
}

.site-header {
  height: var(--header-height);
  padding: 24px var(--side);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  position: relative;
  z-index: 20;
}

.brand {
  text-decoration: none;
  font-family: var(--display);
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: fit-content;
}

.brand strong { font-size: 14px; letter-spacing: .03em; }
.brand span { font-size: 13px; }

.main-nav {
  display: flex;
  gap: clamp(32px, 5vw, 72px);
  padding-top: 8px;
}

.main-nav a {
  text-decoration: none;
  font-family: var(--display);
  font-size: 13px;
  color: #575852;
  padding-bottom: 12px;
  border-bottom: 1px solid transparent;
}

.main-nav a.is-active {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.menu-button {
  justify-self: end;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid rgba(40,40,35,.22);
  background: rgba(255,255,255,.1);
  display: grid;
  place-content: center;
  gap: 4px;
  cursor: pointer;
}

.menu-button span {
  width: 16px;
  height: 1px;
  background: currentColor;
  display: block;
}

.hero-section {
  min-height: calc(100svh - var(--header-height));
  padding: 26px var(--side) 72px;
  display: grid;
  grid-template-columns: minmax(300px, .82fr) minmax(520px, 1.35fr);
  align-items: center;
  gap: clamp(42px, 6vw, 108px);
  position: relative;
  overflow: hidden;
}

.track-column {
  position: relative;
}

.track-copy,
.track-details {
  padding-left: clamp(18px, 5vw, 78px);
  position: relative;
  transition: opacity .28s ease, transform .4s cubic-bezier(.2,.8,.2,1);
}

.track-copy::before {
  content: "";
  position: absolute;
  left: 0;
  top: -80px;
  bottom: -90px;
  width: 1px;
  background: rgba(45,45,40,.14);
}

.track-kicker {
  font-size: 12px;
  letter-spacing: .06em;
  font-weight: 650;
  margin: 0 0 34px;
}

.track-kicker span:first-child { color: var(--accent); }

h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(56px, 6.3vw, 108px);
  line-height: 1.08;
  letter-spacing: -.055em;
  font-weight: 500;
  word-break: keep-all;
  text-wrap: balance;
}

.player-row {
  margin-top: 34px;
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 11px;
  letter-spacing: .04em;
}

.play-button {
  width: 38px;
  height: 38px;
  border: 1px solid color-mix(in srgb, var(--accent), transparent 25%);
  color: var(--accent);
  border-radius: 50%;
  background: rgba(255,255,255,.28);
  cursor: pointer;
}

.play-button:disabled {
  cursor: not-allowed;
  opacity: .48;
  filter: grayscale(.45);
}

.play-button.is-playing .play-icon { font-size: 0; }
.play-button.is-playing .play-icon::after { content: "Ⅱ"; font-size: 13px; }

.player-row time { color: var(--accent); }
.player-line { width: 84px; height: 1px; background: rgba(40,40,35,.22); }

.youtube-player-shell {
  width: min(100%, 360px);
  margin-top: 26px;
  padding: 8px;
  background: rgba(255,255,255,.34);
  border: 1px solid rgba(40,40,35,.16);
  box-shadow: 0 16px 38px rgba(58,48,38,.1);
}

.youtube-player-label {
  min-height: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 4px 8px;
  font-size: 9px;
  letter-spacing: .08em;
}

.youtube-player-label a {
  color: var(--accent);
  text-decoration: none;
}

#youtubePlayer,
#youtubePlayer iframe {
  display: block;
  width: 100%;
  min-height: 200px;
  border: 0;
}

.track-intro {
  margin-top: 52px;
  font-family: var(--display);
  font-size: clamp(17px, 1.5vw, 22px);
  line-height: 1.75;
  min-height: 120px;
  word-break: keep-all;
}

.track-intro p { margin: 0; }
.track-intro p + p { margin-top: 0.15em; }

.mini-divider {
  width: 24px;
  height: 1px;
  background: var(--ink);
  margin: 26px 0;
}

.credits {
  margin: 0;
  display: grid;
  gap: 12px;
  font-size: 10px;
}

.credits div { display: grid; grid-template-columns: 100px 1fr; }
.credits dt { color: #555750; }
.credits dd { margin: 0; font-family: var(--display); }

.hero-collage {
  min-height: 650px;
  position: relative;
  display: grid;
  place-items: center;
  isolation: isolate;
}

.hero-artwork {
  width: min(78%, 640px);
  max-height: 690px;
  object-fit: contain;
  position: relative;
  z-index: 3;
  filter: saturate(.92) contrast(.98);
  transition: opacity .42s ease, transform .65s cubic-bezier(.2,.8,.2,1), filter .42s ease;
}

.hero-collage.is-changing .hero-artwork,
.context-visual.is-changing img { opacity: 0; filter: blur(2px) saturate(.8); }

.track-column.is-changing .track-copy,
.track-column.is-changing .track-details {
  opacity: 0;
  transform: translateY(10px);
}

.paper-back {
  position: absolute;
  width: 74%;
  right: 4%;
  top: 4%;
  z-index: 1;
  opacity: .7;
  transform: rotate(3deg);
}

.decor {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  transition: opacity .35s ease, transform .55s ease;
}

.decor-grid { width: 34%; right: 8%; bottom: 2%; z-index: 2; --decor-opacity: .72; }
.decor-film { width: 22%; right: 2%; bottom: 13%; z-index: 5; transform: rotate(9deg); }
.decor-flower { width: 22%; right: -2%; top: 22%; z-index: 5; transform: rotate(6deg); }
.decor-tape { width: 22%; top: 2%; left: 32%; z-index: 6; transform: rotate(-2deg); }
.decor-stamp { width: 20%; left: 3%; bottom: 7%; z-index: 7; mix-blend-mode: multiply; }
.decor-object { width: 30%; right: -1%; bottom: 1%; z-index: 6; }
.decor-water { width: 38%; right: 14%; top: 18%; z-index: 5; }
.decor.is-visible { opacity: var(--decor-opacity, 1); }

.hero-collage[data-track="1"] .hero-artwork { width: min(68%, 560px); transform: translate(-6%, 1%) rotate(-1.5deg); }
.hero-collage[data-track="1"] .decor-film { right: 0; bottom: 10%; transform: rotate(10deg); }
.hero-collage[data-track="1"] .decor-flower { right: 1%; top: 18%; transform: rotate(8deg); }
.hero-collage[data-track="1"] .decor-stamp { left: 8%; bottom: 11%; transform: rotate(-8deg); }

.hero-collage[data-track="2"] .hero-artwork { width: min(82%, 680px); transform: translate(2%, 0) rotate(.8deg); }
.hero-collage[data-track="2"] .decor-grid { right: 4%; bottom: 8%; transform: rotate(4deg); }
.hero-collage[data-track="2"] .decor-object { width: 32%; left: 1%; right: auto; bottom: 2%; transform: rotate(-12deg); }
.hero-collage[data-track="2"] .decor-water { width: 44%; right: 10%; top: 15%; }

.hero-collage[data-track="3"] .hero-artwork { width: min(72%, 590px); transform: translate(-2%, 2%) rotate(2.5deg); }
.hero-collage[data-track="3"] .decor-film { right: -2%; bottom: 4%; transform: rotate(-7deg); }
.hero-collage[data-track="3"] .decor-flower { left: 2%; right: auto; top: 16%; transform: rotate(-12deg); }
.hero-collage[data-track="3"] .decor-tape { left: 42%; top: 1%; transform: rotate(6deg); }

.hero-collage[data-track="4"] .hero-artwork { width: min(84%, 700px); transform: translate(1%, 0) rotate(-.5deg); }
.hero-collage[data-track="4"] .decor-object { width: 36%; right: -3%; bottom: -1%; transform: rotate(7deg); }
.hero-collage[data-track="4"] .decor-flower { width: 18%; left: 2%; right: auto; top: 22%; transform: rotate(-16deg); }
.hero-collage[data-track="4"] .decor-stamp { left: 12%; bottom: 5%; transform: rotate(5deg); }

.hero-collage[data-track="5"] .hero-artwork { width: min(88%, 730px); transform: translate(2%, -1%) rotate(1deg); }
.hero-collage[data-track="5"] .decor-film { right: -1%; bottom: 8%; transform: rotate(7deg); }
.hero-collage[data-track="5"] .decor-flower { right: 4%; top: 12%; transform: rotate(13deg); }
.hero-collage[data-track="5"] .decor-tape { left: 21%; top: 3%; transform: rotate(-7deg); }

.track-dots {
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  gap: 18px;
}

.track-dot {
  width: 7px;
  height: 7px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid rgba(30,30,28,.55);
  background: transparent;
  cursor: pointer;
}

.track-dot.is-active { background: var(--ink); }

.context-section {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  min-height: 430px;
}

.context-visual {
  min-height: 430px;
  position: relative;
  overflow: hidden;
  background: color-mix(in srgb, var(--footer), white 34%);
}

.context-visual > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity .4s ease, transform .55s ease;
}

.context-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(245,240,230,.06), rgba(245,240,230,.25));
}

.context-note {
  position: absolute;
  z-index: 2;
  inset: 46px auto auto var(--side);
  width: min(380px, 72%);
  color: rgba(40,43,38,.72);
}

.context-note span,
.section-label {
  font-size: 11px;
  letter-spacing: .08em;
}

.context-note p {
  margin: 64px 0 0 70px;
  font-family: var(--display);
  font-size: 20px;
  line-height: 1.85;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.about-track {
  background: rgba(250,247,239,.88);
  padding: 72px clamp(38px, 8vw, 110px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-track > p:nth-child(2) {
  margin: 30px 0 48px;
  font-family: var(--display);
  font-size: clamp(18px, 1.55vw, 23px);
  line-height: 1.8;
  max-width: 560px;
  word-break: keep-all;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

.keyword-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(70px, 1fr));
  max-width: 520px;
}

.keyword {
  border-right: 1px solid rgba(40,40,35,.15);
  text-align: center;
  padding: 12px;
}

.keyword:last-child { border-right: 0; }
.keyword i { display: block; font-style: normal; font-size: 23px; margin-bottom: 9px; }
.keyword span { font-family: var(--display); font-size: 13px; }

.tracklist-section {
  padding: 40px var(--side) 54px;
  position: relative;
  background: rgba(248,244,235,.95);
  overflow: hidden;
}

.tracklist-section::after {
  content: "";
  position: absolute;
  width: 240px;
  right: -40px;
  top: 0;
  bottom: 0;
  opacity: .24;
  background: url("assets/common/pressed-flower.webp") center / contain no-repeat;
}

.tracklist-section header {
  display: flex;
  gap: 22px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.tracklist-section h2 { font-size: 12px; letter-spacing: .06em; margin: 0; }
.tracklist-section header span { font-size: 9px; color: #aaa79e; }

.track-list {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  position: relative;
  z-index: 1;
}

.track-item {
  padding: 4px 28px 14px;
  border-right: 1px solid rgba(40,40,35,.12);
  background: transparent;
  border-top: 0;
  border-left: 0;
  border-bottom: 0;
  cursor: pointer;
  font-family: var(--display);
  text-align: center;
  position: relative;
}

.track-item:last-child { border-right: 0; }
.track-item small { font-size: 13px; }
.track-item strong { display: block; margin: 12px 0 8px; font-size: 18px; font-weight: 500; }
.track-item time { font-size: 12px; }
.track-item.is-active { color: var(--accent); }
.track-item.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  transform: translateX(-50%);
}

.track-item:hover { color: var(--accent); }
.track-item:focus-visible,
.track-dot:focus-visible,
.next-button:focus-visible,
.all-tracks:focus-visible,
.menu-button:focus-visible,
.main-nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.progress-line {
  margin: 12px 4% 0;
  height: 1px;
  background: rgba(50,50,45,.2);
  position: relative;
}

.progress-line span {
  position: absolute;
  top: 50%;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  transform: translate(-50%, -50%);
  transition: left .45s ease, background .35s ease;
}

.next-track-bar {
  min-height: 126px;
  padding: 18px var(--side);
  background: var(--footer);
  color: rgba(255,255,255,.92);
  display: grid;
  grid-template-columns: auto 120px minmax(150px, .7fr) 1.25fr auto auto;
  align-items: center;
  gap: clamp(20px, 3vw, 54px);
  transition: background .4s ease;
}

.next-label, .all-tracks {
  font-size: 11px;
  letter-spacing: .08em;
}

.next-track-bar img {
  width: 120px;
  height: 78px;
  object-fit: cover;
}

.next-copy small { display: block; font-size: 12px; }
.next-copy strong { display: block; font-family: var(--display); font-size: 24px; font-weight: 500; margin-top: 8px; }

.next-track-bar p {
  font-family: var(--display);
  line-height: 1.65;
  font-size: 14px;
  word-break: keep-all;
}

.next-button, .all-tracks {
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.next-button {
  width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.4);
  font-size: 24px;
}

.all-tracks { border: 0; }

@media (max-width: 1024px) {
  .site-header { grid-template-columns: 1fr auto; }
  .main-nav {
    display: none;
    position: absolute;
    top: calc(100% - 8px);
    left: var(--side);
    right: var(--side);
    padding: 24px;
    background: rgba(250,247,239,.97);
    border: 1px solid rgba(40,40,35,.15);
    box-shadow: 0 18px 50px rgba(50,42,32,.12);
  }
  .main-nav.is-open { display: flex; }
  .hero-section {
    grid-template-columns: 1fr 1.18fr;
    gap: 24px;
  }
  .hero-collage { min-height: 550px; }
  .track-copy, .track-details { padding-left: 24px; }
  .decor-film, .decor-stamp { display: none; }
  .next-track-bar {
    grid-template-columns: auto 100px 1fr auto;
  }
  .next-track-bar p, .all-tracks { display: none; }
}

@media (max-width: 760px) {
  :root { --header-height: 88px; }
  .site-header { padding-top: 18px; }
  .menu-button { width: 44px; height: 44px; }
  .main-nav.is-open { flex-direction: column; gap: 18px; }

  .hero-section {
    min-height: auto;
    padding-top: 32px;
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .track-column { display: contents; }
  .track-copy { order: 1; padding-left: 18px; }
  .hero-collage { order: 2; min-height: 470px; margin-inline: -10px; }
  .track-details { order: 3; padding-left: 18px; }
  .track-copy::before { top: -20px; bottom: -10px; }
  h1 { font-size: clamp(52px, 17vw, 78px); }
  .youtube-player-shell { width: min(100%, 420px); }
  .track-intro { margin-top: 36px; min-height: auto; }
  .credits { margin-bottom: 14px; }
  .hero-artwork { width: 86%; }
  .decor-flower { width: 26%; right: 1%; }
  .decor-object { width: 34%; }
  .track-dots { display: none; }

  .context-section { grid-template-columns: 1fr; }
  .context-visual { min-height: 320px; }
  .context-note { inset: 28px auto auto 24px; }
  .context-note p { margin: 48px 0 0; font-size: 16px; }
  .about-track { padding: 52px 24px; }

  .tracklist-section { padding-inline: 20px; }
  .track-list {
    grid-template-columns: repeat(5, minmax(150px, 1fr));
    overflow-x: auto;
    padding-bottom: 12px;
    scroll-snap-type: x mandatory;
  }
  .track-item { scroll-snap-align: start; padding-inline: 18px; }
  .progress-line { display: none; }

  .next-track-bar {
    grid-template-columns: auto 76px 1fr auto;
    gap: 14px;
    min-height: 104px;
    padding-inline: 20px;
  }
  .next-track-bar img { width: 76px; height: 60px; }
  .next-label { display: none; }
  .next-copy strong { font-size: 19px; }
}