@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Fraunces:opsz,wght@9..144,600;9..144,700&display=swap");

:root {
  color-scheme: light;
  --ink: oklch(23% 0.025 60);
  --ink-muted: oklch(44% 0.025 60);
  --paper: oklch(95.5% 0.018 83);
  --paper-deep: oklch(89% 0.027 77);
  --surface: oklch(98% 0.012 83);
  --line: oklch(77% 0.025 72);
  --accent: oklch(64% 0.19 38);
  --accent-dark: oklch(43% 0.14 35);
  --green: oklch(47% 0.085 164);
  --shadow: oklch(29% 0.03 58 / 0.13);
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  padding-bottom: calc(9.5rem + env(safe-area-inset-bottom));
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 49.8%, oklch(69% 0.03 73 / 0.16) 50%, transparent 50.2%),
    repeating-linear-gradient(0deg, transparent 0 3px, oklch(55% 0.03 80 / 0.022) 4px),
    var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  font-kerning: normal;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

button:focus {
  outline: none;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--surface);
  background: var(--ink);
  transform: translateY(-160%);
}

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

.site-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-lg);
  width: min(100% - 2rem, 90rem);
  margin: 0 auto;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  width: fit-content;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 2.75rem;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: inset 0 0 0 0.4rem oklch(29% 0.03 60);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  width: 60%;
  height: 1px;
  background: var(--paper-deep);
  content: "";
  transform: rotate(-12deg);
}

.brand-mark::after {
  width: 43%;
  transform: rotate(22deg);
}

.brand-mark i,
.toast-vinyl i,
.end-record i {
  z-index: 1;
  width: 0.45rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
}

.brand strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  line-height: 1;
}

.brand small {
  display: block;
  margin-top: 0.22rem;
  color: var(--ink-muted);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
}

.chapter {
  display: none;
  align-items: center;
  gap: 1rem;
}

.eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.chapter-progress {
  display: flex;
  gap: 0.35rem;
}

.chapter-progress i {
  display: block;
  width: 1.55rem;
  height: 0.24rem;
  background: var(--paper-deep);
}

.chapter-progress i.active {
  background: var(--accent);
}

.text-button {
  min-height: 2.75rem;
  padding: 0.5rem 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.text-button span {
  margin-right: 0.25rem;
  color: var(--accent);
  font-size: 1rem;
}

.game-shell {
  width: min(100% - 2rem, 90rem);
  margin: 0 auto;
}

.briefing {
  display: grid;
  gap: 1.25rem;
  padding: clamp(2rem, 6vw, 4.5rem) 0 2rem;
}

.briefing .eyebrow {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--accent-dark);
}

h1 {
  max-width: 14ch;
  margin: 0 0 0 -0.045em;
  font-family: var(--font-display);
  font-size: clamp(2.65rem, 8.5vw, 5.8rem);
  letter-spacing: -0.055em;
  line-height: 0.92;
}

h1 em {
  position: relative;
  color: var(--accent);
  font-style: italic;
}

h1 em::after {
  position: absolute;
  right: -0.16em;
  bottom: -0.06em;
  left: 0;
  height: 0.1em;
  background: var(--accent);
  content: "";
  transform: rotate(-2deg);
}

.briefing > p {
  max-width: 31rem;
  margin: 0;
  color: var(--ink-muted);
  line-height: 1.7;
}

.valid-rules {
  align-self: end;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.valid-rules > span {
  display: block;
  margin-bottom: 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

#rule-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

#rule-chips span {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 99rem;
  background: var(--surface);
  font-size: 0.76rem;
  font-weight: 600;
}

#rule-chips i {
  width: 0.38rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
}

.game-content {
  display: grid;
  gap: 1.25rem;
  padding-bottom: 3rem;
}

.score-rail {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  align-items: end;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.record-stat,
.rail-stat {
  padding: 0.75rem 0.65rem;
}

.record-stat {
  border-right: 1px solid var(--line);
}

.score-rail span {
  display: block;
  color: var(--ink-muted);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
}

.score-rail strong {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
}

.record-stat strong {
  color: var(--accent);
  font-size: 2.2rem;
}

.source-stamp {
  display: none;
}

.board-wrap {
  min-width: 0;
}

.board-caption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.board-caption p {
  margin: 0;
}

.board-caption p span {
  margin-right: 0.25rem;
  color: var(--accent);
}

#board-progress {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.song-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  min-height: 18rem;
}

.song-card {
  position: relative;
  display: grid;
  min-width: 0;
  padding: 0;
  overflow: visible;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  animation: card-in 480ms var(--ease-out) both;
  animation-delay: calc(var(--i) * 28ms);
}

.artwork {
  position: relative;
  display: block;
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid oklch(72% 0.025 70);
  background: var(--paper-deep);
  box-shadow: 0 0.3rem 0.7rem var(--shadow);
  transition:
    transform 220ms var(--ease-out),
    box-shadow 220ms var(--ease-out);
}

.artwork::after,
.mini-art::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, oklch(98% 0.01 80 / 0.2), transparent 38%, oklch(20% 0.02 60 / 0.1));
  content: "";
  pointer-events: none;
}

.artwork img,
.mini-art img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.generated-cover {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 0.45rem;
  overflow: hidden;
  color: oklch(96% 0.02 75);
  background:
    radial-gradient(circle at 50% 45%, transparent 0 9%, var(--cover-b) 9.5% 10.5%, transparent 11% 26%, oklch(20% 0.02 60 / 0.45) 27% 28%, transparent 29%),
    linear-gradient(135deg, var(--cover-a), var(--cover-b));
  text-align: center;
}

.generated-cover::before {
  position: absolute;
  width: 72%;
  aspect-ratio: 1;
  border: 1px solid currentColor;
  border-radius: 50%;
  content: "";
  opacity: 0.35;
}

.generated-cover i {
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 4vw, 2.4rem);
  font-style: normal;
}

.generated-cover b {
  position: absolute;
  z-index: 1;
  right: 0.3rem;
  bottom: 0.3rem;
  left: 0.3rem;
  overflow: hidden;
  font-size: 0.45rem;
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.pick-mark {
  position: absolute;
  right: 0.4rem;
  bottom: 0.4rem;
  display: grid;
  width: 1.5rem;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  color: var(--surface);
  background: var(--ink);
  font-size: 0.9rem;
  font-style: normal;
  opacity: 0;
  transform: scale(0.7);
  transition:
    opacity 140ms,
    transform 220ms var(--ease-out);
}

.song-info {
  display: block;
  min-width: 0;
  padding: 0.52rem 0.05rem 0.15rem;
}

.song-info strong,
.song-info > span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-info strong {
  font-size: clamp(0.72rem, 2.4vw, 0.88rem);
  line-height: 1.35;
}

.song-info > span {
  margin-top: 0.1rem;
  color: var(--ink-muted);
  font-size: 0.64rem;
}

.card-year {
  position: absolute;
  top: 0.3rem;
  left: 0.3rem;
  padding: 0.18rem 0.3rem;
  color: var(--paper);
  background: oklch(20% 0.02 60 / 0.83);
  font-size: 0.52rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}

.song-card.hinted .artwork,
.tray-slot.hinted {
  box-shadow: 0 0 0 0.22rem var(--accent), 0 0.6rem 1.4rem oklch(64% 0.19 38 / 0.3);
  transform: translateY(-0.25rem);
}

.empty-board {
  display: grid;
  grid-column: 1 / -1;
  min-height: 18rem;
  place-items: center;
  align-content: center;
  gap: 0.75rem;
  color: var(--ink-muted);
  border: 1px dashed var(--line);
}

.empty-board span {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 3rem;
}

.empty-board p {
  margin: 0;
}

.tray-dock {
  position: fixed;
  z-index: 20;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 0.65rem max(1rem, env(safe-area-inset-right)) max(0.65rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  border-top: 1px solid var(--ink);
  background: oklch(93% 0.026 80);
  box-shadow: 0 -0.65rem 2rem oklch(30% 0.03 60 / 0.1);
}

.tray-inner {
  display: grid;
  grid-template-areas:
    "label tools"
    "slots slots";
  grid-template-columns: 1fr auto;
  gap: 0.55rem 1rem;
  width: min(100%, 90rem);
  margin: 0 auto;
}

.tray-label {
  grid-area: label;
  align-self: center;
}

.tray-label > span {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.tray-label small {
  display: block;
  margin-top: 0.1rem;
  color: var(--ink-muted);
  font-size: 0.6rem;
}

.tray-slots {
  display: grid;
  grid-area: slots;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.25rem;
}

.tray-slot {
  position: relative;
  display: grid;
  min-width: 0;
  aspect-ratio: 1;
  place-items: center;
  overflow: hidden;
  border: 1px dashed var(--line);
  background: oklch(90% 0.027 78);
  transition:
    opacity 150ms,
    transform 220ms var(--ease-out);
}

.tray-slot > i {
  color: oklch(59% 0.025 70);
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-style: normal;
}

.tray-slot.occupied {
  border-style: solid;
  background: var(--surface);
  animation: slot-in 260ms var(--ease-out);
}

.mini-art {
  position: absolute;
  inset: 0;
}

.mini-art .generated-cover b,
.mini-art .generated-cover i {
  display: none;
}

.slot-title {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  overflow: hidden;
  padding: 0.12rem;
  color: var(--surface);
  background: oklch(20% 0.02 60 / 0.8);
  font-size: 0.42rem;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tools {
  display: flex;
  grid-area: tools;
  gap: 0.25rem;
}

.tool-button {
  position: relative;
  display: flex;
  min-width: 2.8rem;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.45rem;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.tool-button > span:last-child {
  display: none;
  font-size: 0.7rem;
  font-weight: 700;
}

.tool-icon {
  font-size: 1.25rem;
}

.tool-button small {
  position: absolute;
  top: -0.15rem;
  right: -0.12rem;
  display: grid;
  width: 1rem;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  color: var(--surface);
  background: var(--ink);
  font-size: 0.58rem;
}

.tool-button.accent {
  color: var(--surface);
  background: var(--accent);
}

.tool-button:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}

.relation-toast {
  position: fixed;
  z-index: 30;
  top: max(1rem, env(safe-area-inset-top));
  left: 50%;
  display: grid;
  grid-template-columns: auto 1fr;
  width: min(calc(100% - 2rem), 28rem);
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 0.35rem 0.35rem 0 var(--ink);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -140%);
}

.relation-toast.show {
  animation: toast-show 2200ms var(--ease-out) both;
}

.toast-vinyl {
  display: grid;
  width: 2.75rem;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle, transparent 0 3px, oklch(40% 0.025 60) 4px 5px),
    var(--ink);
}

.relation-toast span {
  display: block;
  color: var(--accent-dark);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.relation-toast strong {
  display: block;
  overflow: hidden;
  margin-top: 0.12rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.relation-toast > b {
  position: absolute;
  top: -0.55rem;
  right: 0.55rem;
  padding: 0.16rem 0.35rem;
  color: var(--surface);
  background: var(--accent);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
}

.end-screen {
  position: fixed;
  z-index: 50;
  inset: 0;
  padding: max(2rem, env(safe-area-inset-top)) max(1.5rem, env(safe-area-inset-right)) max(2rem, env(safe-area-inset-bottom)) max(1.5rem, env(safe-area-inset-left));
  overflow-y: auto;
  color: var(--paper);
  background:
    radial-gradient(circle at 68% 28%, oklch(35% 0.055 51), transparent 28rem),
    oklch(20% 0.03 58);
  opacity: 0;
  text-align: center;
  transition: opacity 300ms var(--ease-out);
}

.end-screen[hidden] {
  display: none;
}

.end-screen.visible {
  opacity: 1;
}

.end-record {
  position: relative;
  display: grid;
  width: min(44vw, 12rem);
  aspect-ratio: 1;
  margin: 1rem auto 2rem;
  place-items: center;
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle, transparent 0 0.7rem, oklch(36% 0.025 60) 0.74rem 0.78rem),
    oklch(13% 0.015 60);
  box-shadow: 1rem 1.2rem 2rem oklch(9% 0.02 60 / 0.35);
}

.end-record::after {
  position: absolute;
  width: 34%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.end-record i {
  z-index: 1;
  background: var(--paper);
}

.end-screen .eyebrow {
  color: oklch(77% 0.12 51);
}

.end-screen h2 {
  margin: 0.7rem auto 1.5rem;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 10vw, 5rem);
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.end-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(100%, 32rem);
  margin: 0 auto;
  border-top: 1px solid oklch(75% 0.03 65 / 0.35);
  border-bottom: 1px solid oklch(75% 0.03 65 / 0.35);
}

.end-stats div {
  padding: 0.9rem 0.4rem;
}

.end-stats div + div {
  border-left: 1px solid oklch(75% 0.03 65 / 0.35);
}

.end-stats span {
  display: block;
  color: oklch(76% 0.025 68);
  font-size: 0.62rem;
}

.end-stats strong {
  display: block;
  margin-top: 0.25rem;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
}

.end-screen > p {
  min-height: 1.5rem;
  color: oklch(78% 0.028 72);
  font-size: 0.75rem;
}

.end-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.primary-button {
  min-width: 13rem;
  min-height: 3.2rem;
  padding: 0.75rem 1.3rem;
  border: 0;
  color: var(--surface);
  background: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

.end-screen .text-button {
  color: var(--paper);
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(0.75rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slot-in {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
}

@keyframes toast-show {
  0% {
    opacity: 0;
    transform: translate(-50%, -140%);
  }
  10%,
  82% {
    opacity: 1;
    transform: translate(-50%, 0);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -130%);
  }
}

@media (hover: hover) {
  .song-card:hover .artwork {
    box-shadow: 0 0.75rem 1.1rem var(--shadow);
    transform: translateY(-0.28rem) rotate(-0.4deg);
  }

  .song-card:hover .pick-mark {
    opacity: 1;
    transform: scale(1);
  }

  .text-button:hover,
  .tool-button:not(:disabled):hover {
    color: var(--accent-dark);
  }

  .tool-button.accent:not(:disabled):hover {
    color: var(--surface);
    background: var(--accent-dark);
  }
}

@media (min-width: 40rem) {
  body {
    padding-bottom: calc(7.4rem + env(safe-area-inset-bottom));
  }

  .site-header {
    grid-template-columns: 1fr auto 1fr;
  }

  .chapter {
    display: flex;
  }

  .site-header > .text-button {
    justify-self: end;
  }

  .briefing {
    grid-template-columns: minmax(18rem, 1.2fr) minmax(15rem, 0.8fr);
    align-items: end;
  }

  .valid-rules {
    grid-column: 2;
  }

  .song-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1rem 0.8rem;
  }

  .tray-inner {
    grid-template-areas: "label slots tools";
    grid-template-columns: 6.5rem minmax(0, 40rem) auto;
    align-items: center;
    justify-content: center;
    gap: 1rem;
  }

  .tray-slots {
    gap: 0.4rem;
  }

  .tool-button {
    flex-direction: column;
    min-width: 3.25rem;
    padding: 0.35rem 0.5rem;
  }

  .tool-button > span:last-child {
    display: block;
  }

  .tool-icon {
    font-size: 1rem;
  }

  .tool-button small {
    top: 0.16rem;
    right: 0.14rem;
  }
}

@media (min-width: 64rem) {
  .briefing {
    grid-template-columns: 1.2fr 0.65fr 0.85fr;
    min-height: 18rem;
    padding-bottom: 2.5rem;
  }

  .briefing > p {
    align-self: end;
    margin-bottom: 0.4rem;
  }

  .valid-rules {
    grid-column: auto;
  }

  .game-content {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: 2rem;
  }

  .score-rail {
    display: block;
    border-bottom: 0;
  }

  .record-stat,
  .rail-stat {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
  }

  .record-stat {
    border-right: 0;
  }

  .source-stamp {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
  }

  .source-stamp .status-dot {
    display: block;
    width: 0.5rem;
    aspect-ratio: 1;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 0.2rem oklch(47% 0.085 164 / 0.12);
  }

  .source-stamp.offline .status-dot {
    background: var(--accent);
    box-shadow: 0 0 0 0.2rem oklch(64% 0.19 38 / 0.12);
  }

  .source-stamp b,
  .source-stamp small {
    display: block;
    font-size: 0.62rem;
    line-height: 1.3;
  }

  .source-stamp small {
    margin-top: 0.12rem;
    color: var(--ink-muted);
  }

  .song-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1.2rem 0.9rem;
  }

  .song-info strong {
    font-size: 0.82rem;
  }
}

@media (min-width: 82rem) {
  .song-grid {
    grid-template-columns: repeat(10, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}