:root {
  color-scheme: light;
  --ink: #20211f;
  --muted: #6e716b;
  --paper: #f7f4ec;
  --panel: #fffdf8;
  --line: #d8d5cc;
  --accent: #1e6558;
  --accent-dark: #154b42;
  --accent-soft: #dcebe6;
  --danger: #a4382e;
  --shadow: 0 18px 48px rgb(32 33 31 / 10%);
  font-family: Inter, "Hiragino Sans", "Yu Gothic UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgb(255 255 255 / 90%), transparent 26rem),
    var(--paper);
}

button, input, textarea { font: inherit; }
button { color: inherit; }

.app-header {
  height: 68px;
  padding: 0 clamp(20px, 4vw, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgb(32 33 31 / 9%);
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  border: 0;
  background: transparent;
  font-weight: 800;
  letter-spacing: .08em;
  cursor: pointer;
}

.brand-mark { color: var(--accent); font-size: 1.35rem; }
.view { width: min(1440px, 100%); margin: 0 auto; padding: clamp(24px, 5vw, 72px); }
.view[hidden] { display: none; }

.home-view {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, .8fr);
  gap: clamp(36px, 8vw, 120px);
  align-items: center;
}

.eyebrow { color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 8px 0 18px; font-size: clamp(2.3rem, 6vw, 5.6rem); line-height: 1.03; letter-spacing: -.055em; }
.lead { max-width: 580px; color: var(--muted); font-size: clamp(1rem, 1.8vw, 1.25rem); line-height: 1.9; }

.start-card, .panel, .result-card, .dialog-card {
  background: rgb(255 253 248 / 94%);
  border: 1px solid rgb(32 33 31 / 10%);
  box-shadow: var(--shadow);
}

.start-card { padding: clamp(24px, 4vw, 42px); border-radius: 28px; }
.grid-choice { border: 0; padding: 0; margin: 0 0 28px; }
.grid-choice legend { margin-bottom: 12px; font-size: .82rem; font-weight: 700; color: var(--muted); }
.grid-choice label { display: inline-block; margin-right: 8px; }
.grid-choice input { position: absolute; opacity: 0; }
.grid-choice span { display: block; padding: 12px 16px; border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.grid-choice input:checked + span { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.start-actions { display: grid; gap: 10px; }
.primary-button, .secondary-button, .quiet-button, .tool-button, .compact-tool, .icon-button {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 700;
  cursor: pointer;
}
.primary-button { background: var(--accent); color: white; }
.primary-button:hover { background: var(--accent-dark); }
.primary-button:disabled { opacity: .38; cursor: not-allowed; }
.secondary-button { background: var(--accent-soft); color: var(--accent-dark); }
.quiet-button { background: transparent; border: 1px solid var(--line); }
.support-copy { color: var(--muted); font-size: .78rem; line-height: 1.65; margin: 18px 0 0; }
.full-width { width: 100%; }

.editor-view { padding-top: 32px; }
.editor-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 22px; }
.editor-heading h1 { font-size: clamp(2rem, 4vw, 3.6rem); margin-bottom: 0; }
.editor-base-id { margin: 8px 0 0; color: var(--muted); font-size: .7rem; }
.editor-base-id code { margin-left: 5px; color: var(--ink); overflow-wrap: anywhere; }
.editor-heading-actions { display: flex; gap: 8px; }
.file-button input { display: none; }
.workspace { display: grid; grid-template-columns: 220px minmax(420px, 1fr) 280px; gap: 14px; align-items: start; }
.panel { border-radius: 18px; overflow: hidden; }
.piece-panel, .settings-panel { padding: 18px; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.panel-heading > div { display: flex; align-items: center; gap: 8px; }
.panel-heading h2 { font-size: 1rem; margin: 0; }
.step-number { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--ink); color: white; font-size: .72rem; }
.icon-button { padding: 5px 10px; font-size: 1.3rem; background: var(--accent-soft); color: var(--accent); }

.piece-list { display: grid; gap: 8px; margin-bottom: 14px; max-height: 52vh; overflow: auto; }
.piece-item { display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px; border: 1px solid transparent; border-radius: 10px; background: transparent; cursor: pointer; text-align: left; }
.piece-item.active { border-color: var(--accent); background: var(--accent-soft); }
.piece-swatch { width: 20px; height: 20px; border-radius: 6px; flex: none; }
.piece-meta { flex: 1; }
.piece-meta strong, .piece-meta small { display: block; }
.piece-meta small { color: var(--muted); margin-top: 2px; }
.piece-delete { border: 0; background: transparent; color: var(--muted); padding: 5px; cursor: pointer; }

.editor-controls { border-bottom: 1px solid var(--line); background: #faf8f2; }
.mode-toolbar, .transform-toolbar { display: flex; align-items: center; gap: 12px; padding: 10px 12px; }
.mode-toolbar { border-bottom: 1px solid var(--line); }
.control-label { color: var(--muted); font-size: .66rem; font-weight: 800; white-space: nowrap; }
.segmented-control { display: inline-flex; padding: 3px; border-radius: 12px; background: #e9e6de; }
.tool-button { padding: 8px 12px; white-space: nowrap; background: transparent; border-radius: 9px; font-size: .76rem; }
.tool-button.active { background: white; color: var(--accent-dark); box-shadow: 0 1px 5px rgb(32 33 31 / 14%); }
.transform-toolbar { flex-wrap: wrap; }
.transform-group { display: flex; align-items: center; gap: 5px; padding-right: 12px; border-right: 1px solid var(--line); }
.compact-tool { min-width: 34px; padding: 7px 9px; border: 1px solid var(--line); border-radius: 9px; background: white; font-size: .75rem; }
.compact-tool:hover { border-color: var(--accent); color: var(--accent-dark); }
.compact-tool:disabled { opacity: .35; cursor: not-allowed; }
.opacity-control { display: flex; align-items: center; gap: 6px; margin-left: auto; color: var(--muted); font-size: .7rem; white-space: nowrap; }
.board-wrap { position: relative; min-height: min(62vh, 720px); overflow: auto; background-color: #edeae2; background-image: radial-gradient(#cbc7bd 1px, transparent 1px); background-size: 16px 16px; }
#board { display: block; position: relative; z-index: 2; min-width: 100%; min-height: 100%; touch-action: none; }
#board-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; z-index: 1; pointer-events: none; opacity: .42; }
.grid-cell { fill: rgb(255 255 255 / 22%); stroke: rgb(32 33 31 / 24%); stroke-width: 1; cursor: crosshair; transition: filter .12s ease, opacity .12s ease; }
.grid-cell:hover { filter: brightness(.94); }
.grid-cell.occupied { stroke: white; stroke-width: 2.5; opacity: .94; }
.grid-cell.selected-piece { stroke: var(--ink); stroke-width: 3; }
.grid-cell.move-anchor { stroke: var(--accent); stroke-width: 5; }
.board-wrap.dragging-piece-active { cursor: grabbing; }
.grid-cell.dragging-piece {
  opacity: .8;
  filter: drop-shadow(0 8px 7px rgb(32 33 31 / 32%));
  pointer-events: none;
  will-change: transform;
}
.board-empty-hint { position: absolute; z-index: 3; left: 50%; top: 50%; transform: translate(-50%, -50%); padding: 10px 14px; border-radius: 999px; background: rgb(255 253 248 / 88%); color: var(--muted); pointer-events: none; font-size: .8rem; }
.board-help { margin: 0; padding: 10px 14px; color: var(--muted); font-size: .75rem; border-top: 1px solid var(--line); }

.toggle-list { display: grid; gap: 4px; }
.toggle-list label { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--line); }
.toggle-list span, .toggle-list strong, .toggle-list small { display: block; }
.toggle-list small { margin-top: 3px; color: var(--muted); }
.toggle-list input { width: 38px; height: 22px; accent-color: var(--accent); }
.validation-card { margin: 18px 0 12px; padding: 12px; border-radius: 10px; font-size: .78rem; line-height: 1.6; }
.validation-card.neutral { background: #f0eee8; color: var(--muted); }
.validation-card.valid { background: var(--accent-soft); color: var(--accent-dark); }
.validation-card.invalid { background: #f7dfdc; color: var(--danger); }

.result-view { display: grid; place-items: center; min-height: calc(100vh - 68px); }
.result-card { width: min(720px, 100%); padding: clamp(24px, 5vw, 54px); border-radius: 28px; }
.result-card h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
.id-box { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.id-box code { align-self: center; overflow-wrap: anywhere; font-size: clamp(.9rem, 2vw, 1.15rem); }
.result-summary { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }
.summary-chip { padding: 7px 10px; border-radius: 999px; background: #efede7; font-size: .76rem; }
.preview-toolbar { display: flex; align-items: center; gap: 6px; margin: 14px 0 8px; overflow-x: auto; }
.preview-toolbar > span { margin-right: auto; color: var(--muted); font-size: .7rem; font-weight: 800; white-space: nowrap; }
.preview-toolbar .quiet-button { padding: 7px 9px; font-size: .7rem; white-space: nowrap; }
.mini-board { min-height: 180px; display: grid; place-items: center; border-radius: 14px; background: #eeece5; overflow: auto; }
.mini-board svg { max-width: 100%; }
.debug-details { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 14px; }
.debug-details summary { color: var(--accent-dark); font-size: .82rem; font-weight: 800; cursor: pointer; }
.debug-note { color: var(--muted); font-size: .74rem; line-height: 1.55; }
.debug-section { margin-top: 16px; }
.debug-section h3 { margin: 0; font-size: .78rem; letter-spacing: .04em; }
.debug-section-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 8px; }
.debug-section-heading p { margin: 3px 0 0; color: var(--muted); font-size: .68rem; }
.debug-bytes-section { padding: 13px; border-radius: 12px; background: #242724; color: #d9f1df; }
.debug-bytes { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 9px; font: .76rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; }
.debug-byte { min-width: 2.15em; padding: 4px 5px; border: 1px solid rgb(217 241 223 / 17%); border-radius: 5px; text-align: center; }
.debug-metadata { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.debug-meta-card { padding: 11px; border: 1px solid var(--line); border-radius: 10px; background: white; }
.debug-meta-card > span { display: block; color: var(--muted); font-size: .64rem; text-transform: uppercase; letter-spacing: .08em; }
.debug-meta-card > strong { display: block; margin-top: 4px; font-size: .95rem; }
.mask-flags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 7px; }
.mask-flag { padding: 3px 6px; border-radius: 999px; background: #eceae4; color: var(--muted); font-size: .6rem; }
.mask-flag.enabled { background: var(--accent-soft); color: var(--accent-dark); font-weight: 800; }
.debug-list { display: grid; gap: 6px; }
.debug-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 10px; background: white; color: inherit; text-align: left; cursor: pointer; }
.debug-row:hover, .debug-row:focus-visible, .debug-row.active { border-color: var(--accent); background: var(--accent-soft); outline: 0; }
.debug-index { display: grid; place-items: center; min-width: 28px; height: 28px; padding: 0 5px; border-radius: 7px; background: #eceae4; font: .7rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.debug-row.active .debug-index, .debug-row:hover .debug-index { background: var(--accent); color: white; }
.debug-row-main { min-width: 0; }
.debug-row-main strong { display: block; overflow: hidden; text-overflow: ellipsis; font: .72rem ui-monospace, SFMono-Regular, Menlo, monospace; white-space: nowrap; }
.debug-row-main small { display: block; margin-top: 3px; color: var(--muted); font-size: .65rem; }
.debug-count { color: var(--muted); font-size: .68rem; white-space: nowrap; }
.mini-board .grid-cell { transition: opacity .12s ease, filter .12s ease, stroke-width .12s ease; }
.mini-board.debug-filtering .grid-cell { opacity: .18; filter: grayscale(.7); }
.mini-board.debug-filtering .grid-cell.debug-highlight { opacity: 1; filter: none; stroke: var(--ink); stroke-width: 4; }
.result-actions { display: flex; gap: 8px; margin-top: 18px; }

dialog { width: min(520px, calc(100% - 30px)); padding: 0; border: 0; border-radius: 22px; background: transparent; }
dialog::backdrop { background: rgb(20 22 20 / 48%); backdrop-filter: blur(5px); }
.dialog-card { position: relative; padding: 32px; border-radius: 22px; }
.dialog-card h2 { margin: 6px 0 8px; font-size: 1.7rem; }
.dialog-card p { color: var(--muted); line-height: 1.6; }
.dialog-card textarea { width: 100%; resize: vertical; padding: 12px; border: 1px solid var(--line); border-radius: 10px; margin: 8px 0; }
.dialog-close { position: absolute; right: 14px; top: 12px; border: 0; background: transparent; font-size: 1.5rem; cursor: pointer; }
.field-error { min-height: 1.4em; color: var(--danger) !important; font-size: .8rem; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); padding: 10px 16px; border-radius: 999px; background: var(--ink); color: white; opacity: 0; pointer-events: none; transition: .2s ease; z-index: 10; }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1040px) {
  .workspace { grid-template-columns: 190px minmax(400px, 1fr); }
  .settings-panel { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .settings-panel .panel-heading { grid-column: 1 / -1; margin-bottom: 0; }
}

@media (max-width: 720px) {
  .app-header { height: 58px; padding: 0 16px; }
  .view { padding: 22px 14px; }
  .home-view { min-height: auto; grid-template-columns: 1fr; align-content: start; gap: 28px; }
  .home-view h1 { margin-top: 14px; }
  .editor-heading { align-items: start; gap: 14px; }
  .editor-heading-actions { flex-direction: column; }
  .workspace { display: flex; flex-direction: column; }
  .board-panel { order: 1; width: 100%; }
  .piece-panel { order: 2; width: 100%; }
  .settings-panel { order: 3; width: 100%; display: block; }
  .piece-list { display: flex; max-height: none; overflow-x: auto; }
  .piece-item { min-width: 150px; }
  .board-wrap { min-height: 54vh; }
  .mode-toolbar { align-items: flex-start; flex-direction: column; gap: 6px; }
  .segmented-control { width: 100%; }
  .segmented-control .tool-button { flex: 1; padding-inline: 7px; }
  .transform-toolbar { align-items: stretch; gap: 8px; }
  .transform-group { flex: 1 1 auto; padding: 8px; border: 1px solid var(--line); border-radius: 10px; }
  .transform-group .control-label { margin-right: auto; }
  .opacity-control { width: 100%; margin-left: 0; }
  .id-box { grid-template-columns: 1fr; }
  .debug-metadata { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; }
}