/* ════════════════════════════════════════════════════════════════════
   ShadowDraw — styles.css
   Aesthetic: Dark research-lab / sci-fi terminal
   Fonts: JetBrains Mono (mono), Syne (display), DM Sans (body)
   ════════════════════════════════════════════════════════════════════ */

@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600&family=Syne:wght@600;700;800&family=DM+Sans:wght@300;400;500&display=swap");

/* ── Design Tokens ── */
:root {
  --bg: #080b14;
  --bg-2: #0d1120;
  --bg-3: #111827;
  --surface: rgba(17, 24, 39, 0.85);
  --surface-2: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
  --border-2: rgba(0, 229, 255, 0.2);

  --accent: #00e5ff;
  --accent-2: #7df9ff;
  --accent-glow: rgba(0, 229, 255, 0.35);
  --accent-dim: rgba(0, 229, 255, 0.12);

  --accent-alt: #bf5af2;

  --danger: #ff3e6c;
  --danger-dim: rgba(255, 62, 108, 0.15);
  --success: #adff2f;

  --text: #e8edf5;
  --text-2: #8b95a8;
  --text-3: #4a5568;

  --font-mono: "JetBrains Mono", monospace;
  --font-display: "Syne", sans-serif;
  --font-body: "DM Sans", sans-serif;

  --radius: 8px;
  --radius-lg: 14px;

  --toolbar-h: 76px;
  --header-h: 52px;
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font: inherit;
}
input[type="range"] {
  cursor: pointer;
}
.hidden {
  display: none !important;
}

/* ════════════════════════════════
   SPLASH SCREEN
   ════════════════════════════════ */
#splash-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  background-image:
    radial-gradient(
      ellipse 60% 50% at 50% 0%,
      rgba(0, 229, 255, 0.06) 0%,
      transparent 70%
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      rgba(255, 255, 255, 0.02) 40px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 39px,
      rgba(255, 255, 255, 0.02) 40px
    );
}

.splash-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  animation: fadeUp 0.7s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.splash-logo {
  animation: pulse-glow 2s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%,
  100% {
    filter: drop-shadow(0 0 8px var(--accent-glow));
  }
  50% {
    filter: drop-shadow(0 0 20px var(--accent));
  }
}

.splash-title {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -2px;
  color: var(--text);
  line-height: 1;
  background: linear-gradient(135deg, var(--accent) 0%, var(--text) 60%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.splash-sub {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-2);
  letter-spacing: 0.04em;
}

.splash-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 99px;
}

.btn-launch {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  background: var(--accent);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  margin-top: 8px;
  transition: all 0.2s;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-launch:hover {
  background: #fff;
  box-shadow: 0 0 40px var(--accent-glow);
  transform: translateY(-1px);
}

.splash-note {
  font-size: 11px;
  color: var(--text-3);
  font-family: var(--font-mono);
}

/* ════════════════════════════════
   APP LAYOUT
   ════════════════════════════════ */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ── Header ── */
#app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: rgba(8, 11, 20, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  z-index: 100;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-mark {
  display: flex;
  align-items: center;
}
.app-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.app-version {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.header-center {
  display: flex;
  align-items: center;
}

.gesture-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-2);
  transition:
    border-color 0.3s,
    color 0.3s;
  min-width: 180px;
  justify-content: center;
}
.gesture-badge.drawing {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--accent-dim);
}
.gesture-badge.idle {
  border-color: var(--accent-alt);
  color: var(--accent-alt);
}
.gesture-badge.clear {
  border-color: var(--danger);
  color: var(--danger);
}

.gesture-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: blink 1.2s ease infinite;
}
@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.2;
  }
}

.header-right {
  display: flex;
  gap: 8px;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
}
.stat-label {
  color: var(--text-3);
  font-size: 9px;
  letter-spacing: 0.1em;
}
.stat-chip span:last-child {
  color: var(--accent);
}

/* ── Canvas Area ── */
#canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #050810;
}

#webcam-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* mirror */
  opacity: 0.18;
  filter: saturate(0) brightness(0.7);
  z-index: 0;
}

#drawing-canvas {
  position: absolute;
  inset: 0;
  z-index: 10;
  cursor: none;
}

/* ── Draw Cursor ── */
.draw-cursor {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 20;
  transition:
    transform 0.05s,
    opacity 0.2s;
  box-shadow: 0 0 10px var(--accent-glow);
}
.draw-cursor.drawing {
  background: var(--accent);
  transform: translate(-50%, -50%) scale(0.6);
  box-shadow: 0 0 20px var(--accent);
}

/* ════════════════════════════════
   INSTRUCTIONS PANEL
   ════════════════════════════════ */
#instructions-panel {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 30;
  width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(0, 229, 255, 0.05);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.gesture-list {
  list-style: none;
  padding: 8px 0;
}
.gesture-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}
.gesture-list li:last-child {
  border-bottom: none;
}
.gesture-list li:hover {
  background: var(--surface-2);
}

.gesture-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.gesture-list li div:last-child {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.gesture-list li strong {
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
}
.gesture-list li span {
  font-size: 10px;
  color: var(--text-2);
  font-family: var(--font-mono);
}

.panel-footer {
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--border);
}
.panel-tip {
  font-size: 10px;
  color: var(--text-3);
  font-family: var(--font-mono);
  line-height: 1.4;
}

/* ════════════════════════════════
   TOOLBAR
   ════════════════════════════════ */
#toolbar {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(24px);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.03);
  padding: 10px 16px;
  overflow-x: auto;
  max-width: calc(100vw - 32px);
}

.tool-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
}
.tool-label {
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-3);
  text-transform: uppercase;
  user-select: none;
}
.tool-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
  flex-shrink: 0;
}

/* Color swatches */
.color-swatches {
  display: flex;
  align-items: center;
  gap: 5px;
}
.swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--c);
  border: 2px solid transparent;
  transition:
    transform 0.15s,
    border-color 0.15s;
  position: relative;
}
.swatch:hover {
  transform: scale(1.2);
}
.swatch.active {
  border-color: #fff;
  transform: scale(1.15);
  box-shadow: 0 0 10px var(--c);
}

#custom-color {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: none;
  padding: 0;
  cursor: pointer;
  overflow: hidden;
  appearance: none;
  -webkit-appearance: none;
}
#custom-color::-webkit-color-swatch-wrapper {
  padding: 0;
  border: none;
}
#custom-color::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

/* Brush size */
.brush-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 90px;
  height: 3px;
  background: var(--border);
  border-radius: 99px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}
#brush-size-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  min-width: 28px;
}

/* Smooth toggles */
.smooth-toggles {
  display: flex;
  gap: 4px;
}
.tag-btn {
  padding: 3px 9px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-2);
  transition: all 0.2s;
}
.tag-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.tag-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

/* Toggle button */
.toggle-btn {
  padding: 2px;
  border-radius: 99px;
  display: flex;
  align-items: center;
}
.toggle-track {
  width: 36px;
  height: 20px;
  border-radius: 99px;
  background: var(--border);
  display: flex;
  align-items: center;
  padding: 2px;
  transition: background 0.2s;
}
.toggle-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-3);
  transition:
    transform 0.2s,
    background 0.2s;
}
.toggle-btn.active .toggle-track {
  background: var(--accent-dim);
  border: 1px solid var(--accent);
}
.toggle-btn.active .toggle-thumb {
  transform: translateX(16px);
  background: var(--accent);
}

/* Action buttons */
.action-btns {
  display: flex;
  gap: 4px;
}
.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-2);
  transition: all 0.15s;
}
.icon-btn:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--accent);
}
.icon-btn.danger:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-dim);
}
.icon-btn.success:hover {
  border-color: var(--success);
  color: var(--success);
}
.icon-btn:disabled {
  opacity: 0.3;
  pointer-events: none;
}

/* ════════════════════════════════
   METRICS PANEL
   ════════════════════════════════ */
#metrics-panel {
  position: absolute;
  bottom: 100px;
  right: 16px;
  z-index: 30;
  width: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.metrics-title {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
  font-weight: 500;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-2);
}
.metric-row:last-child {
  border-bottom: none;
}
.metric-row span:last-child {
  color: var(--text);
  font-weight: 500;
}

/* ════════════════════════════════
   LOADING OVERLAY
   ════════════════════════════════ */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 11, 20, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#loading-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-2);
}

.loading-bar-track {
  width: 240px;
  height: 2px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.loading-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px var(--accent);
}

/* ════════════════════════════════
   CAMERA ERROR
   ════════════════════════════════ */
.camera-error {
  position: absolute;
  inset: 0;
  background: rgba(8, 11, 20, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
}
.error-box {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px;
  background: var(--surface);
  border: 1px solid var(--danger);
  border-radius: var(--radius-lg);
  max-width: 360px;
}
.error-icon {
  font-size: 36px;
  color: var(--danger);
}
.error-box h2 {
  font-family: var(--font-display);
  font-size: 20px;
}
.error-box p {
  font-size: 14px;
  color: var(--text-2);
}

/* ════════════════════════════════
   CANVAS BACKGROUND GRID
   ════════════════════════════════ */
#canvas-area::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      rgba(255, 255, 255, 0.025) 40px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 39px,
      rgba(255, 255, 255, 0.025) 40px
    );
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 1;
}

/* ════════════════════════════════
   NOTIFICATION TOAST
   ════════════════════════════════ */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 8px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  backdrop-filter: blur(16px);
  z-index: 999;
  opacity: 0;
  transition:
    opacity 0.3s,
    transform 0.3s;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.success {
  border-color: var(--success);
  color: var(--success);
}
.toast.error {
  border-color: var(--danger);
  color: var(--danger);
}
.toast.info {
  border-color: var(--accent);
  color: var(--accent);
}

/* ════════════════════════════════
   RESPONSIVE
   ════════════════════════════════ */
@media (max-width: 768px) {
  #instructions-panel {
    display: none;
  }
  #metrics-panel {
    display: none;
  }

  #toolbar {
    bottom: 8px;
    padding: 8px 10px;
    gap: 0;
  }
  .tool-group {
    padding: 0 6px;
  }
  .color-swatches {
    gap: 4px;
  }
  .swatch {
    width: 18px;
    height: 18px;
  }
  input[type="range"] {
    width: 60px;
  }
}