/* hashAIwokakero front-end styles. Dark, clean, no external assets. */

*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #0b0e13;
  --panel: #141922;
  --panel-2: #1a212c;
  --panel-3: #202938;
  --border: #273040;
  --border-strong: #38455a;
  --text: #e6edf3;
  --muted: #8b98a9;
  --accent: #4d9fff;
  --accent-strong: #7ab8ff;
  --accent-contrast: #06121f;
  --solution: #ffc857;
  --success: #3fb950;
  --danger: #f2554c;
  --warning: #d9a521;

  /* Canvas palette (read by app.js) */
  --canvas-bg: #0e131b;
  --corridor: #3a4657;
  --island-fill: #2b3547;
  --island-border: #4c5d78;
  --island-text: #ffffff;
  --satisfied: #2ea043;
  --violated: #e5534b;
  --highlight: #9dccff;

  /* Tier badges */
  --tier-easy: #3fb950;
  --tier-medium: #4d9fff;
  --tier-hard: #f0883e;
  --tier-expert: #b98cff;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.38);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --maxw: 1180px;
  --tap: 42px;
}

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 20% -10%, #16202e 0%, var(--bg) 55%) fixed;
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { margin: 0 0 var(--space-2); line-height: 1.2; font-weight: 650; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 var(--space-3); }
a { color: var(--accent); }

.mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; }
.muted { color: var(--muted); }
.accent { color: var(--accent); }
.small-print { font-size: 0.8rem; }
[hidden] { display: none !important; }

:focus-visible { outline: 2px solid var(--accent-strong); outline-offset: 2px; border-radius: 6px; }

/* ---------------------------------------------------------------- buttons */
.btn {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--panel-2);
  color: var(--text);
  border-radius: var(--radius-sm);
  min-height: var(--tap);
  padding: 8px 14px;
  font: inherit;
  font-weight: 550;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}
.btn:hover:not(:disabled) { background: var(--panel-3); border-color: var(--accent); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover:not(:disabled) { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-ghost { background: transparent; }
.btn-danger { background: rgba(242, 85, 76, 0.12); border-color: var(--danger); color: #ffd6d3; }
.btn-danger:hover:not(:disabled) { background: rgba(242, 85, 76, 0.22); border-color: var(--danger); }
.btn-small { min-height: 40px; padding: 6px 12px; font-size: 0.85rem; }
.btn-block { width: 100%; }
.btn-chip { min-height: 40px; padding: 6px 14px; border-radius: 999px; }
.btn.is-busy { position: relative; }
.btn.is-busy::after {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 8px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -1px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ----------------------------------------------------------------- layout */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  background: rgba(11, 14, 19, 0.85);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.topbar-title { font-weight: 700; font-size: 1.05rem; letter-spacing: 0.3px; }
.topbar-right { display: flex; align-items: center; gap: var(--space-2); }

.tabbar {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4) 0;
  max-width: var(--maxw);
  margin: 0 auto;
  overflow-x: auto;
}
.tab {
  min-height: 48px;
  padding: 0 16px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: 8px 8px 0 0;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.tab:hover { color: var(--text); background: var(--panel); }
.tab[aria-selected="true"] { color: var(--text); background: var(--panel); border-color: var(--border); border-bottom-color: var(--accent); }

.content { max-width: var(--maxw); margin: 0 auto; padding: var(--space-4); }
.panel-head { margin-bottom: var(--space-4); }

/* --------------------------------------------------------------- banners */
.banner { border: 1px solid; border-radius: var(--radius-sm); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-3); font-weight: 550; }
.banner-error { background: rgba(242, 85, 76, 0.14); border-color: var(--danger); color: #ffd9d6; }
.banner-success { background: rgba(63, 185, 80, 0.16); border-color: var(--success); color: #d6ffe0; font-size: 1.05rem; }
.banner-warning { background: rgba(217, 165, 33, 0.14); border-color: var(--warning); color: #ffeec2; }
#global-error {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: max-content;
  max-width: min(680px, calc(100vw - 32px));
  margin: 0;
  box-shadow: var(--shadow);
}

/* ------------------------------------------------------------------ form */
.field { display: flex; flex-direction: column; gap: var(--space-1); min-width: 0; }
.field-label { display: flex; justify-content: space-between; gap: var(--space-2); font-size: 0.82rem; color: var(--muted); }
input[type="number"], input[type="text"], input[type="password"], select {
  width: 100%;
  min-height: var(--tap);
  padding: 8px 10px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font: inherit;
}
input[type="number"]:hover, input[type="text"]:hover, input[type="password"]:hover, select:hover { border-color: var(--accent); }
input[type="range"] { width: 100%; min-height: var(--tap); accent-color: var(--accent); }
input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--accent); }
output { font-size: 0.82rem; }

.create-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-4);
}
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.form-grid .field:nth-child(1), .form-grid .field:nth-child(2) { }
.range-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
.check-row { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.check { display: flex; align-items: center; gap: var(--space-2); min-height: var(--tap); font-size: 0.9rem; cursor: pointer; }
.tier-row { display: grid; grid-template-columns: minmax(200px, 320px) minmax(0, 1fr); gap: var(--space-3); align-items: start; }
.form-actions { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.note { margin: 0; padding: var(--space-2) var(--space-3); background: var(--panel-2); border-left: 3px solid var(--accent); border-radius: 6px; font-size: 0.85rem; }
.presets { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }

.filters { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: flex-end; margin-bottom: var(--space-3); }
.filters .field { min-width: 120px; }
.filters-actions { display: flex; gap: var(--space-2); }

/* ---------------------------------------------------------------- results */
.results { margin-top: var(--space-3); }
.results-head { display: flex; align-items: baseline; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-2); }
.results-head h3 { margin: 0; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-3); }

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-width: 0;
}
.card-head { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.size { font-weight: 700; }
.score, .aesthetic { font-size: 0.85rem; }
.card-meta { display: flex; flex-wrap: wrap; gap: var(--space-3); font-size: 0.82rem; }
.seed-row { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.seed {
  padding: 4px 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  overflow-wrap: anywhere;
  -webkit-user-select: all;
  user-select: all;
}
.card-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.solution-preview {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
  padding-top: var(--space-3);
  border-top: 1px dashed var(--border);
}
.solution-edges { margin: 0; padding-left: 1.1rem; font-size: 0.8rem; color: var(--muted); column-count: 2; column-gap: var(--space-4); }
.mini-board { background: var(--canvas-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); }

/* ---------------------------------------------------------------- badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.badge-planned { background: var(--panel-3); border-color: var(--border-strong); color: var(--muted); text-transform: uppercase; }
.badge-kind { background: rgba(242, 85, 76, 0.14); border-color: var(--danger); color: #ffd6d3; text-transform: uppercase; }
.badge-solution { background: rgba(255, 200, 87, 0.16); border-color: var(--solution); color: #ffe6ac; margin-left: auto; }
.badge-solved { background: rgba(63, 185, 80, 0.2); border-color: var(--success); color: #d6ffe0; }
.tier-easy { background: rgba(63, 185, 80, 0.16); border-color: var(--tier-easy); color: #b7f0c4; }
.tier-medium { background: rgba(77, 159, 255, 0.16); border-color: var(--tier-medium); color: #b9d9ff; }
.tier-hard { background: rgba(240, 136, 62, 0.16); border-color: var(--tier-hard); color: #ffd0ab; }
.tier-expert { background: rgba(185, 140, 255, 0.18); border-color: var(--tier-expert); color: #e2ccff; }
.tier-unknown { background: var(--panel-3); border-color: var(--border-strong); color: var(--muted); }

/* ------------------------------------------------------------------ play */
.play-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
.board-toolbar { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-3); }
.canvas-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 240px;
  padding: var(--space-3);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
#play-canvas { display: block; border-radius: var(--radius-sm); touch-action: none; cursor: crosshair; }
/* Unmistakable "done" state: the board frame turns solid green. */
.canvas-wrap.is-solved { border-color: var(--success); box-shadow: 0 0 0 1px var(--success), var(--shadow); }
.empty-note { margin: 0; text-align: center; }

.play-status { display: flex; flex-direction: column; gap: var(--space-2); margin-top: var(--space-3); }
.progress-line { margin: 0; font-size: 0.9rem; }
.violations { display: flex; flex-direction: column; gap: var(--space-2); margin: 0; padding: 0; list-style: none; }
.violation {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: rgba(242, 85, 76, 0.08);
  border: 1px solid rgba(242, 85, 76, 0.4);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
}
.violation-text { flex: 1; }
.violation-none { font-size: 0.86rem; }

.picker, .meta-block, .rules {
  padding: var(--space-3);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
}
.picker-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-2); }
.picker-head h3 { margin: 0; }
.picker-list { display: flex; flex-direction: column; gap: var(--space-2); max-height: 380px; overflow-y: auto; }
.picker-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  text-align: left;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font: inherit;
  cursor: pointer;
}
.picker-item:hover { background: var(--panel-3); border-color: var(--accent); }
.picker-top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.picker-sub { font-size: 0.78rem; }

.meta-head { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-2); }
.meta-row { display: flex; justify-content: space-between; gap: var(--space-3); padding: 3px 0; border-bottom: 1px dashed var(--border); font-size: 0.85rem; }
.meta-row:last-child { border-bottom: none; }
.meta-label { flex: 0 0 auto; }
.meta-value { display: flex; align-items: center; gap: var(--space-2); min-width: 0; text-align: right; }

.rules summary { display: flex; align-items: center; min-height: 40px; font-weight: 600; cursor: pointer; }
.rules ol { margin: var(--space-2) 0 0; padding-left: 1.2rem; color: var(--muted); font-size: 0.86rem; }
.rules li { margin-bottom: var(--space-2); }

/* --------------------------------------------------------------- library */
.stats-strip { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-3); }
.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
}
.pager { display: flex; align-items: center; justify-content: center; gap: var(--space-3); margin: var(--space-4) 0; }

/* ----------------------------------------------------------------- solve */
.solver-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--space-4); }
.solver-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-2); }
.solver-head h3 { margin: 0; }
.solver-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* ----------------------------------------------------------------- login */
.login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: radial-gradient(900px 500px at 50% -10%, #182233 0%, var(--bg) 60%);
}
.login-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  max-width: 360px;
  padding: var(--space-5);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.login-brand { margin: 0; font-size: 1.4rem; }
.login-sub { margin: 0; font-size: 0.88rem; }
.field-error {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  background: rgba(242, 85, 76, 0.12);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  color: #ffd6d3;
  font-size: 0.88rem;
}

/* ------------------------------------------------------------------ boot */
.boot { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; background: var(--bg); }
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ------------------------------------------------------------ responsive */
@media (min-width: 980px) {
  .play-layout { grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr); align-items: start; }
}
@media (max-width: 760px) {
  .form-grid { grid-template-columns: 1fr; }
  .range-row { grid-template-columns: 1fr; }
  .tier-row { grid-template-columns: 1fr; }
  .content { padding: var(--space-3); }
  .topbar { padding: var(--space-2) var(--space-3); }
  .tabbar { padding-left: var(--space-3); padding-right: var(--space-3); }
  .solution-edges { column-count: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .btn.is-busy::after, .spinner { animation: none; }
  .btn { transition: none; }
}