/* Two-pane layout: 55% top (3D), 45% bottom (controls) */
:root {
  --bg: #0b0f1a;
  --glass: rgba(18, 22, 34, 0.55);
  --border: rgba(255, 255, 255, 0.16);
  --txt: #e7ecf7;
  --accent: #8E24AA;
  --danger: #ff4757;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  overflow: hidden;
}

#topPane, #bottomPane {
  position: relative;
  width: 100vw;
}

#topPane {
  height: 55vh;
}

#bottomPane {
  height: 45vh;
  padding: 12px;
}

/* 3D Canvas */
#gfx-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: radial-gradient(1200px 700px at 50% 110%, #0f1530, #0b0f1a 70%);
  pointer-events: none;
}

/* UI Background */
#ui-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: linear-gradient(180deg, #0d1328, #0b0f1a);
  pointer-events: none;
}

/* Main Controls */
.front-controls {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 14px;
  backdrop-filter: blur(6px);
  z-index: 2;
}

.control-btn {
  font-size: 14px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--txt);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  cursor: pointer;
  transition: all 0.2s ease;
}

.control-btn:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.06));
}

.control-btn:active {
  transform: scale(0.95);
}

.control-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Timer Chips */
.chips {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}

.chip {
  font-size: 13px;
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 10px;
  backdrop-filter: blur(6px);
}

/* Settings Modal */
#settingsSheet[hidden] {
  display: none !important;
}

#settingsSheet {
  position: fixed;
  inset: 0;
  z-index: 1000;
}

#settingsSheet .scrim {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  z-index: 1000;
}

#settingsSheet .sheet {
  position: fixed;
  right: 0;
  top: 0;
  width: min(460px, 100%);
  height: 100dvh;
  overflow: auto;
  background: #0f1429;
  border-left: 1px solid var(--border);
  padding: 14px 14px 24px;
  z-index: 1001;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

#settingsSheet header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

#settingsSheet h2, #settingsSheet h3 {
  margin: 0;
  color: var(--txt);
}

#settingsSheet .group {
  margin: 20px 0;
}

#settingsSheet .block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin: 10px 0;
}

#settingsSheet .block legend {
  padding: 0 8px;
  font-weight: 600;
}

#settingsSheet .row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 8px 0;
}

#settingsSheet .row.radios label,
#settingsSheet .row.toggles label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

#settingsSheet .col {
  flex: 1;
  min-width: 120px;
}

/* Form Elements */
#settingsSheet input[type="text"],
#settingsSheet input[type="file"],
#settingsSheet input[type="number"] {
  width: 100%;
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--txt);
}

#settingsSheet input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

#settingsSheet button {
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  color: var(--txt);
  cursor: pointer;
  transition: all 0.2s ease;
}

#settingsSheet button:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.06));
}

#settingsSheet button.ghost {
  background: transparent;
  border-color: transparent;
}

#settingsSheet button.ghost:hover {
  background: rgba(255, 255, 255, 0.05);
}

.hint {
  opacity: 0.75;
  font-size: 12px;
  margin: 4px 0;
}

/* Responsive */
@media (max-height: 640px) {
  .front-controls {
    top: 8px;
  }
  
  .chips {
    bottom: 8px;
  }
  
  #settingsSheet .sheet {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .front-controls {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .chips {
    flex-direction: column;
    align-items: center;
  }
  
  #settingsSheet .sheet {
    width: 100%;
  }
}

/* Safe area support */
#bottomPane {
  padding-bottom: max(12px, env(safe-area-inset-bottom));
}

#settingsSheet .sheet {
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}