:root {
  --paper: #e9ebdf;
  --paper-deep: #d8ddcc;
  --sumi: #151718;
  --ink-soft: rgba(21, 23, 24, 0.72);
  --indigo: #24536c;
  --cinnabar: #b84c32;
  --moss: #486a4f;
  --gold: #b7984d;
  --line: rgba(21, 23, 24, 0.16);
  --panel: rgba(235, 237, 225, 0.68);
  --panel-strong: rgba(248, 249, 241, 0.82);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 52% 38%, rgba(255, 255, 246, 0.42), transparent 38%),
    linear-gradient(145deg, var(--paper), var(--paper-deep));
  color: var(--sumi);
  font-family:
    "Iowan Old Style", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC",
    "Hiragino Mincho ProN", Georgia, serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

button {
  font: inherit;
}

.garden {
  position: fixed;
  inset: 0;
  overflow: hidden;
  isolation: isolate;
}

.layer {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

#paperLayer {
  z-index: 0;
}

#fishLayer {
  z-index: 2;
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: 0.78;
  filter: saturate(0.68) contrast(0.9) brightness(0.97) blur(0.12px);
}

#inkLayer {
  z-index: 1;
  pointer-events: none;
  mix-blend-mode: normal;
}

#surfaceLayer {
  z-index: 3;
  cursor: crosshair;
  touch-action: none;
}

.title {
  position: fixed;
  z-index: 5;
  top: max(24px, env(safe-area-inset-top));
  left: 0;
  right: 0;
  text-align: center;
  pointer-events: none;
  transition: opacity 900ms ease, transform 900ms ease;
}

.title h1 {
  margin: 4px 0 0;
  font-size: clamp(36px, 8vw, 76px);
  line-height: 0.94;
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  font-weight: 700;
}

.title .seal {
  margin: 0;
  color: rgba(21, 23, 24, 0.46);
  font-family: "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(10px, 1.35vw, 13px);
  font-weight: 700;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.title.dim {
  opacity: 0.12;
  transform: translateY(-8px);
}

.poem {
  position: fixed;
  z-index: 4;
  left: max(24px, env(safe-area-inset-left));
  top: 50%;
  transform: translateY(-50%);
  margin: 0;
  writing-mode: vertical-rl;
  letter-spacing: 0.48em;
  color: rgba(21, 23, 24, 0.18);
  font-size: clamp(15px, 1.8vw, 22px);
  font-weight: 650;
  pointer-events: none;
}

.corner-mark,
.seal-mark {
  position: fixed;
  z-index: 4;
  pointer-events: none;
  mix-blend-mode: multiply;
}

.corner-mark {
  width: 74px;
  height: 74px;
  opacity: 0.28;
}

.corner-mark::before,
.corner-mark::after {
  content: "";
  position: absolute;
  display: block;
}

.corner-mark::before {
  width: 100%;
  height: 1px;
}

.corner-mark::after {
  width: 1px;
  height: 100%;
}

.corner-mark-tl {
  top: max(25px, env(safe-area-inset-top));
  left: max(25px, env(safe-area-inset-left));
}

.corner-mark-tl::before {
  top: 0;
  left: 0;
  background: linear-gradient(90deg, rgba(21, 23, 24, 0.34), rgba(21, 23, 24, 0));
}

.corner-mark-tl::after {
  top: 0;
  left: 0;
  background: linear-gradient(180deg, rgba(21, 23, 24, 0.34), rgba(21, 23, 24, 0));
}

.corner-mark-br {
  right: max(25px, env(safe-area-inset-right));
  bottom: max(25px, env(safe-area-inset-bottom));
}

.corner-mark-br::before {
  right: 0;
  bottom: 0;
  background: linear-gradient(270deg, rgba(21, 23, 24, 0.32), rgba(21, 23, 24, 0));
}

.corner-mark-br::after {
  right: 0;
  bottom: 0;
  background: linear-gradient(0deg, rgba(21, 23, 24, 0.32), rgba(21, 23, 24, 0));
}

.seal-mark {
  right: max(40px, calc(env(safe-area-inset-right) + 28px));
  bottom: max(40px, calc(env(safe-area-inset-bottom) + 28px));
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(184, 76, 50, 0.68);
  color: rgba(184, 76, 50, 0.68);
  font-size: 17px;
  font-weight: 760;
  line-height: 1;
  opacity: 0.62;
  transform: rotate(-4deg);
}

.seal-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(184, 76, 50, 0.2);
}

.hud {
  position: fixed;
  z-index: 6;
  left: 50%;
  bottom: max(16px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: min(1050px, calc(100vw - 22px));
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: 0 16px 50px rgba(25, 28, 22, 0.12);
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  transition: opacity 450ms ease, transform 450ms ease;
}

.hud.idle {
  opacity: 0.18;
  transform: translateX(-50%) translateY(10px);
}

.palette,
.tools,
.actions {
  display: flex;
  align-items: center;
  gap: 5px;
}

.divider {
  width: 1px;
  height: 28px;
  background: var(--line);
  flex: 0 0 auto;
}

.chip,
.tool,
.action {
  height: 34px;
  min-width: 34px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: rgba(21, 23, 24, 0.78);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.chip {
  padding: 0;
}

.chip span {
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 28%, rgba(255, 255, 255, 0.34), transparent 34%),
    var(--chip);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.tool,
.action {
  min-width: 38px;
  padding: 0 11px;
}

.chip:hover,
.tool:hover,
.action:hover {
  border-color: rgba(21, 23, 24, 0.2);
  background: rgba(255, 255, 248, 0.42);
}

.chip.active,
.tool.active,
.action.active {
  color: var(--paper);
  border-color: var(--sumi);
  background: var(--sumi);
}

.chip:focus-visible,
.tool:focus-visible,
.action:focus-visible {
  outline: 2px solid var(--indigo);
  outline-offset: 3px;
}

.status {
  position: fixed;
  z-index: 7;
  left: 50%;
  bottom: max(78px, calc(env(safe-area-inset-bottom) + 78px));
  transform: translateX(-50%);
  min-height: 20px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--panel-strong);
  color: rgba(21, 23, 24, 0.66);
  font-family: "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.status.show {
  opacity: 1;
}

.fallback {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 12px;
  padding: 32px;
  text-align: center;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 247, 0.65), transparent 40%),
    var(--paper);
}

.fallback[hidden] {
  display: none;
}

.fallback h2 {
  margin: 0;
  letter-spacing: 0.16em;
}

.fallback p {
  margin: 0;
  color: rgba(21, 23, 24, 0.62);
  line-height: 1.8;
}

.noscript {
  position: fixed;
}

@media (max-width: 760px) {
  .poem {
    display: none;
  }

  .corner-mark {
    width: 52px;
    height: 52px;
    opacity: 0.2;
  }

  .corner-mark-tl {
    top: max(18px, env(safe-area-inset-top));
    left: max(18px, env(safe-area-inset-left));
  }

  .corner-mark-br {
    display: none;
  }

  .seal-mark {
    right: max(17px, calc(env(safe-area-inset-right) + 12px));
    bottom: max(104px, calc(env(safe-area-inset-bottom) + 104px));
    width: 27px;
    height: 27px;
    font-size: 15px;
    opacity: 0.48;
  }

  .hud {
    width: calc(100vw - 18px);
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    border-radius: 22px;
    padding: 8px;
  }

  .divider {
    display: none;
  }

  .tool,
  .action {
    min-width: 34px;
    height: 32px;
    padding: 0 9px;
    font-size: 14px;
  }

  .chip {
    width: 32px;
    height: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .title,
  .hud,
  .status,
  .chip,
  .tool,
  .action {
    transition: none;
  }
}