:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --page-bg: radial-gradient(circle at top left, rgba(50, 120, 255, 0.16), transparent 28rem), #0b0e14;
  --surface: #131722;
  --surface-2: #191e2a;
  --surface-3: #222938;
  --text: #f6f8fb;
  --muted: #a2abba;
  --soft: #7f8898;
  --border: #293140;
  --border-strong: #3d485b;
  --accent: #28a8ff;
  --accent-strong: #178ee0;
  --accent-soft: rgba(40, 168, 255, 0.16);
  --brand-gradient: linear-gradient(135deg, #28a8ff, #8b5cf6);
  --danger: #ff6b6b;
  --ok: #42d392;
  --button-text: #071018;
  --checker-a: #151a22;
  --checker-b: #11161d;
  --grid-minor: rgba(0, 0, 0, 0.30);
  --grid-major: rgba(0, 0, 0, 0.52);
  --grid-contrast: rgba(255, 255, 255, 0.48);
  --select: #00d1ff;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.26);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6f8;
  --page-bg: radial-gradient(circle at top left, rgba(22,119,255,0.12), transparent 30rem), #f4f6f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #eef2f6;
  --text: #10141b;
  --muted: #5f6d7e;
  --soft: #8490a1;
  --border: #d8dee8;
  --border-strong: #b9c3d1;
  --accent: #1677ff;
  --accent-strong: #075fcf;
  --accent-soft: rgba(22, 119, 255, 0.12);
  --brand-gradient: linear-gradient(135deg, #1677ff, #00b8a9);
  --danger: #d92d20;
  --ok: #15803d;
  --button-text: #ffffff;
  --checker-a: #eef1f5;
  --checker-b: #e5e9ef;
  --select: #005bd6;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.10);
}

html[data-theme="midnight"] {
  --page-bg: radial-gradient(circle at 18% 0%, rgba(124,58,237,0.22), transparent 24rem), radial-gradient(circle at 78% 8%, rgba(14,165,233,0.16), transparent 22rem), #070a12;
  --surface: #101524;
  --surface-2: #151c30;
  --surface-3: #202942;
  --border: #283450;
  --border-strong: #405071;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-soft: rgba(125, 211, 252, 0.15);
  --brand-gradient: linear-gradient(135deg, #38bdf8, #a78bfa);
}

html[data-theme="ocean"] {
  --page-bg: linear-gradient(135deg, #052e3f, #063f5d 45%, #0c1824);
  --surface: #0d2230;
  --surface-2: #123044;
  --surface-3: #183d55;
  --border: #25536b;
  --border-strong: #347590;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-soft: rgba(45, 212, 191, 0.15);
  --brand-gradient: linear-gradient(135deg, #2dd4bf, #38bdf8);
}

html[data-theme="sunset"] {
  --page-bg: linear-gradient(135deg, #24111b, #4c1d32 42%, #301307);
  --surface: #1f1620;
  --surface-2: #2c1d2a;
  --surface-3: #3b2736;
  --border: #513044;
  --border-strong: #744059;
  --accent: #fb7185;
  --accent-strong: #f43f5e;
  --accent-soft: rgba(251, 113, 133, 0.15);
  --brand-gradient: linear-gradient(135deg, #fb7185, #f59e0b);
}

html[data-theme="candy"] {
  color-scheme: light;
  --page-bg: radial-gradient(circle at 8% 0%, rgba(236,72,153,0.22), transparent 24rem), radial-gradient(circle at 92% 12%, rgba(34,211,238,0.20), transparent 24rem), #fff7fb;
  --surface: #ffffff;
  --surface-2: #fff0f7;
  --surface-3: #ffe0ef;
  --text: #221321;
  --muted: #745768;
  --soft: #957184;
  --border: #f6c7dc;
  --border-strong: #e89ec2;
  --accent: #ec4899;
  --accent-strong: #db2777;
  --accent-soft: rgba(236, 72, 153, 0.13);
  --brand-gradient: linear-gradient(135deg, #ec4899, #22d3ee);
  --button-text: #ffffff;
  --checker-a: #f4eef3;
  --checker-b: #eadfe8;
  --select: #db2777;
  --shadow: 0 18px 45px rgba(130, 44, 92, 0.12);
}

html[data-theme="forest"] {
  --page-bg: linear-gradient(135deg, #07160f, #123020 48%, #0d1712);
  --surface: #101d16;
  --surface-2: #16251d;
  --surface-3: #1e3127;
  --border: #294536;
  --border-strong: #3b6a50;
  --accent: #7ed957;
  --accent-strong: #52b738;
  --accent-soft: rgba(126, 217, 87, 0.15);
  --brand-gradient: linear-gradient(135deg, #7ed957, #00a368);
}

html[data-theme="mono"] {
  --page-bg: linear-gradient(135deg, #090909, #1b1b1b);
  --surface: #141414;
  --surface-2: #1e1e1e;
  --surface-3: #292929;
  --border: #343434;
  --border-strong: #555;
  --accent: #e5e7eb;
  --accent-strong: #cbd5e1;
  --accent-soft: rgba(229, 231, 235, 0.10);
  --brand-gradient: linear-gradient(135deg, #fafafa, #737373);
  --button-text: #111;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p, ol { margin: 0; }

.topbar {
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
  z-index: 30;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  flex: 0 0 auto;
  border-radius: 0.65rem;
  color: white;
  background: var(--brand-gradient);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.20), 0 10px 28px rgba(0,0,0,0.18);
  font-weight: 900;
}

.brand strong,
.brand small { display: block; }
.brand strong { font-size: 1rem; letter-spacing: -0.03em; }
.brand small {
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 0.12rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-status {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.84rem;
}

.status-pill.live::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  margin-right: 0.45rem;
  border-radius: 999px;
  background: var(--ok);
  box-shadow: 0 0 0 0.25rem color-mix(in srgb, var(--ok) 12%, transparent);
}
.status-pill.offline::before { background: var(--danger); }

.activity-strip {
  height: 2rem;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  background: #141414;
  color: #f4f4f5;
  box-shadow: inset 0 -1px 0 rgba(0,0,0,0.35);
  position: sticky;
  top: 4.25rem;
  z-index: 25;
}

.activity-ticker {
  height: 100%;
  display: flex;
  align-items: center;
  white-space: nowrap;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 850;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.activity-ticker > span {
  padding-left: 1rem;
}

.ticker-track {
  display: inline-flex;
  align-items: center;
  gap: 1.1rem;
  min-width: max-content;
  animation: ticker-scroll 90s linear infinite;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.ticker-item::after {
  content: "•";
  color: #a1a1aa;
  margin-left: 0.55rem;
}

.ticker-swatch {
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 0.16rem;
  border: 1px solid rgba(255,255,255,0.45);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.35);
}

@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 21.25rem;
  gap: 1rem;
  padding: 1rem;
}

.board-card,
.panel {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 97%, transparent);
  box-shadow: var(--shadow);
}

.board-card {
  min-height: calc(100vh - 8.25rem);
  border-radius: 1.1rem;
  overflow: hidden;
}

.board-toolbar {
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0.95rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.selection-readout strong,
.selection-readout span { display: block; }
.selection-readout strong {
  font-size: 0.98rem;
  letter-spacing: -0.02em;
}
.selection-readout span {
  color: var(--muted);
  font-size: 0.86rem;
  margin-top: 0.14rem;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.zoom-controls button,
.text-button,
.segmented button,
.tool-button,
.theme-choice {
  min-height: 2.25rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
}

.zoom-controls button { padding: 0 0.72rem; }
.zoom-controls button:hover,
.text-button:hover,
.segmented button:hover,
.tool-button:hover,
.theme-choice:hover {
  border-color: var(--border-strong);
  background: var(--surface-3);
}

#zoomLabel {
  min-width: 3.75rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.87rem;
}

.viewport {
  position: relative;
  width: 100%;
  height: calc(100vh - 12.35rem);
  min-height: 34rem;
  overflow: hidden;
  cursor: crosshair;
  touch-action: none;
  background-color: var(--checker-a);
  background-image:
    linear-gradient(45deg, var(--checker-b) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-b) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-b) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-b) 75%);
  background-size: 2rem 2rem;
  background-position: 0 0, 0 1rem, 1rem -1rem, -1rem 0;
}

#board {
  position: absolute;
  left: 0;
  top: 0;
  width: 1000px;
  height: 1000px;
  transform-origin: 0 0;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: white;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.35), 0 18px 44px rgba(0,0,0,0.22);
}

.grid-canvas {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.cell-outline,
.hover-outline {
  position: absolute;
  pointer-events: none;
  z-index: 4;
  border-radius: 1px;
}

.cell-outline {
  border: 1px solid var(--select);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.35);
}

.hover-outline {
  z-index: 3;
  border: 1px solid color-mix(in srgb, var(--text) 78%, transparent);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.25);
}

.sidebar {
  display: grid;
  gap: 0.85rem;
  align-content: start;
  position: sticky;
  top: 7.25rem;
}

.panel {
  border-radius: 1rem;
  padding: 0.95rem;
}

.panel-title-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}
.panel-title-row.compact { margin-bottom: 0.7rem; }

.eyebrow {
  display: block;
  color: var(--soft);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.panel h2 {
  font-size: 1rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
  max-width: 12rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-button {
  min-height: 2rem;
  padding: 0 0.65rem;
  font-size: 0.84rem;
  color: var(--muted);
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.3rem;
  padding: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: var(--surface-2);
  margin-bottom: 0.8rem;
}

.segmented button {
  border: 0;
  min-height: 2.1rem;
  border-radius: 0.6rem;
  background: transparent;
  color: var(--muted);
  font-weight: 750;
}

.segmented button[aria-pressed="true"] {
  color: var(--text);
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--border), 0 1px 1px rgba(0,0,0,0.05);
}

.auth-form {
  display: grid;
  gap: 0.52rem;
}

.auth-form label {
  color: var(--muted);
  font-size: 0.83rem;
  margin-top: 0.2rem;
}

.auth-form input,
.hex-input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.68rem 0.75rem;
  color: var(--text);
  outline: none;
  background: var(--surface-2);
}

.auth-form input:focus,
.hex-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.primary-button {
  width: 100%;
  border: 0;
  border-radius: 0.8rem;
  min-height: 2.75rem;
  padding: 0 0.95rem;
  color: var(--button-text);
  background: var(--brand-gradient);
  font-weight: 850;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
}

.auth-form .primary-button { margin-top: 0.38rem; }
.primary-button:not(:disabled):hover { filter: brightness(1.05); }
.primary-button:not(:disabled):active { transform: translateY(1px); }
.primary-button:disabled { opacity: 0.45; cursor: not-allowed; filter: grayscale(0.25); }

.note {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
  margin-top: 0.65rem;
}
.note.good { color: var(--ok); }
.note.bad { color: var(--danger); }

.palette {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
  margin-bottom: 0.8rem;
}

.swatch {
  aspect-ratio: 1;
  border: 1px solid rgba(0,0,0,0.22);
  border-radius: 0.7rem;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.18);
}

.swatch[aria-pressed="true"] {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.color-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.tool-button {
  padding: 0 0.7rem;
  font-weight: 800;
}
.tool-button[aria-pressed="true"] {
  color: var(--button-text);
  background: var(--brand-gradient);
  border-color: transparent;
}

.custom-color {
  display: grid;
  grid-template-columns: auto 2.25rem;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.25rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  padding: 0 0.45rem 0 0.7rem;
  color: var(--muted);
  background: var(--surface);
  font-size: 0.84rem;
  font-weight: 750;
}

.custom-color input {
  width: 2.1rem;
  height: 1.55rem;
  padding: 0;
  border: 0;
  border-radius: 0.4rem;
  overflow: hidden;
  background: transparent;
  cursor: pointer;
}

.hex-input {
  grid-column: 1 / -1;
  min-height: 2.25rem;
  padding: 0 0.7rem;
  text-transform: lowercase;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.place-button { margin-top: 0.1rem; }

.leaderboard {
  display: grid;
  gap: 0.45rem;
  padding-left: 0;
  list-style: none;
}

.leaderboard li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr) auto;
  gap: 0.55rem;
  align-items: center;
  padding: 0.64rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 0.78rem;
  background: var(--surface-2);
}

.leaderboard .rank {
  display: grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-weight: 900;
  color: var(--text);
}
.leaderboard li:nth-child(1) .rank { border-color: #f6c85f; }
.leaderboard li:nth-child(2) .rank { border-color: #b8c0cc; }
.leaderboard li:nth-child(3) .rank { border-color: #b8875f; }

.leaderboard .name {
  font-weight: 800;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.leaderboard .count {
  color: var(--muted);
  font-size: 0.84rem;
}
.leaderboard .empty-row {
  display: block;
  text-align: center;
  color: var(--muted);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
}

.theme-choice {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0 0.65rem;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
}
.theme-choice[aria-pressed="true"] {
  color: var(--text);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.theme-dot {
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.35);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.20);
}
.theme-dot-dark { background: linear-gradient(135deg, #0b0e14, #28a8ff); }
.theme-dot-light { background: linear-gradient(135deg, #ffffff, #1677ff); }
.theme-dot-midnight { background: linear-gradient(135deg, #070a12, #a78bfa); }
.theme-dot-ocean { background: linear-gradient(135deg, #052e3f, #2dd4bf); }
.theme-dot-sunset { background: linear-gradient(135deg, #4c1d32, #f59e0b); }
.theme-dot-candy { background: linear-gradient(135deg, #ec4899, #22d3ee); }
.theme-dot-forest { background: linear-gradient(135deg, #07160f, #7ed957); }
.theme-dot-mono { background: linear-gradient(135deg, #090909, #fafafa); }

.help-panel { box-shadow: none; }
.help-panel p {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

@media (max-width: 1040px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .viewport { height: 62vh; min-height: 25rem; }
  .board-card { min-height: auto; }
}

@media (max-width: 700px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 0.85rem 1rem; }
  .brand small { white-space: normal; }
  .topbar-status { justify-content: flex-start; }
  .activity-strip { top: 6.6rem; }
  .app-shell { padding: 0.75rem; }
  .sidebar { grid-template-columns: 1fr; }
  .board-toolbar { align-items: flex-start; flex-direction: column; }
  .zoom-controls { width: 100%; }
  .zoom-controls button { flex: 1; }
}