:root {
  --ink: #1c1710;
  --ink-soft: #5e564c;
  --studio: #cfc6b6;
  --studio-deep: #b9af9d;
  --panel: #efe8db;
  --paper: #f6f1e6;
  --paper-ink: #1c1710;
  --rule: #d6cdbc;
  --accent: #8a3b24;
  --accent-hover: #6f2e1c;
  --chip: #e4dccb;
  --shadow: 0 24px 60px rgba(40, 28, 12, 0.22);
  --ui: "IBM Plex Sans KR", "Apple SD Gothic Neo", sans-serif;
  --serif: "Noto Serif KR", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: "IBM Plex Sans KR", "Apple SD Gothic Neo", sans-serif;
  --paper-w: 460px;
  --paper-h: 650px;
  --paper-pad: 56px;
  --title-size: 52px;
  --body-size: 17px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--studio);
  color: var(--ink);
  font-family: var(--ui);
}

body {
  min-height: 100dvh;
}

.app {
  display: grid;
  grid-template-columns: minmax(280px, 340px) 1fr;
  min-height: 100dvh;
}

.panel {
  background: var(--panel);
  border-right: 1px solid var(--rule);
  padding: 28px 24px 32px;
  overflow: auto;
}

.brand h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.brand-mark {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.brand-lede {
  margin: 12px 0 16px;
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.55;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--chip);
  font-size: 12px;
}

.status-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #8a8172;
}

.status-chip[data-state="on"]::before {
  background: #2f6b45;
}

.status-chip[data-state="off"]::before {
  background: #8a3b24;
}

.editor {
  display: grid;
  gap: 18px;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  display: grid;
  gap: 10px;
}

legend {
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: rgba(255, 252, 246, 0.8);
  color: var(--ink);
  font: inherit;
  resize: vertical;
}

input[type="text"]:focus,
textarea:focus,
button:focus-visible,
[contenteditable="true"]:focus {
  outline: 2px solid #2f5d4a;
  outline-offset: 2px;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.segmented label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: rgba(255, 252, 246, 0.55);
  font-size: 12.5px;
  cursor: pointer;
}

.segmented input {
  accent-color: var(--accent);
}

.sliders label {
  grid-template-columns: 84px 1fr auto;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.readout {
  min-width: 42px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  font-size: 12px;
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

button {
  font: inherit;
  cursor: pointer;
}

.primary,
.ghost {
  border-radius: 999px;
  padding: 10px 16px;
  border: 1px solid transparent;
}

.primary {
  background: var(--accent);
  color: #f8efe6;
}

.primary:hover {
  background: var(--accent-hover);
}

.ghost {
  background: transparent;
  border-color: var(--rule);
  color: var(--ink);
}

.last-action {
  margin: 20px 0 0;
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.5;
}

.studio {
  display: grid;
  place-items: center;
  padding: 36px 24px;
  background:
    radial-gradient(1200px 600px at 70% 20%, rgba(255, 250, 240, 0.28), transparent 55%),
    linear-gradient(180deg, var(--studio) 0%, var(--studio-deep) 100%);
  overflow: auto;
}

.artboard {
  position: relative;
  width: var(--paper-w);
  height: var(--paper-h);
  padding: var(--paper-pad);
  background: var(--paper);
  color: var(--paper-ink);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 22px;
  overflow: hidden;
  transition:
    padding 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.artboard[data-format="portrait"] {
  --paper-w: 460px;
  --paper-h: 650px;
}

.artboard[data-format="square"] {
  --paper-w: 560px;
  --paper-h: 560px;
}

.artboard[data-align="left"] {
  text-align: left;
  align-items: flex-start;
}

.artboard[data-align="center"] {
  text-align: center;
  align-items: center;
}

.artboard[data-align="right"] {
  text-align: right;
  align-items: flex-end;
}

.artboard[data-font="serif"] .paper-title,
.artboard[data-font="serif"] .paper-body,
.artboard[data-font="serif"] .paper-caption {
  font-family: var(--serif);
}

.artboard[data-font="sans"] .paper-title,
.artboard[data-font="sans"] .paper-body,
.artboard[data-font="sans"] .paper-caption {
  font-family: var(--sans);
}

.artboard[data-paper="ivory"] {
  --paper: #f6f1e6;
  --paper-ink: #1c1710;
}

.artboard[data-paper="white"] {
  --paper: #fbfbfa;
  --paper-ink: #161616;
}

.artboard[data-paper="ink"] {
  --paper: #1b1814;
  --paper-ink: #f3ead8;
}

.paper-grain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.055;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='80' height='80' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

.paper-title,
.paper-body,
.paper-caption {
  position: relative;
  margin: 0;
  width: 100%;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  min-height: 1.2em;
}

.paper-title {
  font-size: var(--title-size);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.12;
}

.paper-body {
  flex: 1;
  font-size: var(--body-size);
  line-height: 1.65;
  font-weight: 400;
}

.paper-caption {
  font-size: 13px;
  letter-spacing: 0.04em;
  opacity: 0.72;
}

.paper-title:empty::before,
.paper-body:empty::before,
.paper-caption:empty::before {
  content: attr(data-placeholder);
  opacity: 0.35;
}

.artboard.is-agent-touch {
  animation: paper-flash 700ms ease;
}

@keyframes paper-flash {
  0% {
    box-shadow: var(--shadow), 0 0 0 0 rgba(138, 59, 36, 0.45);
  }
  100% {
    box-shadow: var(--shadow);
  }
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  .panel {
    border-right: 0;
    border-top: 1px solid var(--rule);
  }

  .studio {
    order: -1;
    min-height: 72dvh;
    padding: 16px 12px 28px;
  }

  .artboard {
    width: min(var(--paper-w), calc(100vw - 24px));
    height: auto;
    aspect-ratio: 460 / 650;
    transform-origin: top center;
  }

  .artboard[data-format="square"] {
    aspect-ratio: 1 / 1;
  }
}