/* ===========================
   DitherMatrix — Style Sheet
   Frutiger Aero / Glassmorphism
   =========================== */

:root {
  --aero-glass: rgba(255, 255, 255, 0.62);
  --aero-accent: #3498db;
  --aero-accent-dark: #2072b2;
  --aero-accent-glow: rgba(52, 152, 219, 0.45);
  --frutiger-green: #27ae60;
  --frutiger-green-glow: rgba(39, 174, 96, 0.4);
  --frutiger-sky: #00c6ff;
  --text-main: #18192e;
  --text-muted: #52527a;
  --border-soft: rgba(255, 255, 255, 0.82);
  --border-inner: rgba(0, 0, 0, 0.06);
  --shadow-soft: 0 12px 40px rgba(0, 0, 0, 0.10);
  --radius-card: 18px;
  --radius-ctrl: 11px;
  --transition: 0.18s ease;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Outfit", "Segoe UI", Tahoma, sans-serif;
}

/* ── Body & Background ── */
body {
  background: #dde8f3;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

/* Animated ambient orbs */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 18s ease-in-out infinite alternate;
}

.orb-1 {
  width: 520px; height: 520px;
  top: -160px; left: -160px;
  background: radial-gradient(circle, rgba(46, 204, 113, 0.28) 0%, transparent 70%);
  animation-duration: 20s;
}
.orb-2 {
  width: 600px; height: 600px;
  bottom: -200px; right: -180px;
  background: radial-gradient(circle, rgba(52, 152, 219, 0.28) 0%, transparent 70%);
  animation-duration: 25s;
  animation-delay: -8s;
}
.orb-3 {
  width: 380px; height: 380px;
  top: 50%; right: 25%;
  background: radial-gradient(circle, rgba(0, 198, 255, 0.15) 0%, transparent 70%);
  animation-duration: 15s;
  animation-delay: -4s;
}

@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.06); }
}

/* ── App Container ── */
.app-container {
  display: flex;
  width: 96vw;
  height: 92vh;
  max-height: 920px;
  background: var(--aero-glass);
  backdrop-filter: blur(32px) saturate(200%);
  -webkit-backdrop-filter: blur(32px) saturate(200%);
  border: 1px solid var(--border-soft);
  border-radius: 26px;
  box-shadow:
    var(--shadow-soft),
    inset 0 0 0 1px rgba(255,255,255,0.6),
    inset 0 1px 0 rgba(255,255,255,0.9);
  overflow: hidden;
  position: relative;
  z-index: 1;
}

/* ── Sidebar ── */
.sidebar {
  width: 300px;
  min-width: 280px;
  background: rgba(255, 255, 255, 0.28);
  border-right: 1px solid var(--border-soft);
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 20;
  flex-shrink: 0;
}

.sidebar-header {
  flex-shrink: 0;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.sidebar-header h1 {
  font-size: 1.7rem;
  font-weight: 700;
  background: linear-gradient(135deg, #1a2a40 0%, #2980b9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1.5px;
  line-height: 1;
}

.sidebar-header h1 span {
  background: linear-gradient(135deg, var(--frutiger-green), #00c6ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-header p {
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-top: 2px;
}

/* Language selector */
.lang-select {
  width: auto !important;
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 10px;
  background: rgba(255,255,255,0.55);
  border: 1px solid rgba(255,255,255,0.5);
  backdrop-filter: blur(8px);
  cursor: pointer;
  outline: none;
  color: var(--text-main);
  transition: background var(--transition);
}
.lang-select:hover { background: rgba(255,255,255,0.75); }

/* ── Control Groups ── */
.control-group {
  background: rgba(255, 255, 255, 0.42);
  border-radius: var(--radius-card);
  padding: 0.95rem 1rem;
  border: 1px solid var(--border-soft);
  box-shadow: 0 3px 12px rgba(0,0,0,0.04), inset 0 1px 0 rgba(255,255,255,0.8);
  flex-shrink: 0;
  transition: box-shadow var(--transition);
}
.control-group:hover {
  box-shadow: 0 6px 18px rgba(0,0,0,0.07), inset 0 1px 0 rgba(255,255,255,0.9);
}

.control-group h3 {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.control-item {
  margin-bottom: 0.85rem;
}
.control-item:last-child { margin-bottom: 0; }

.control-item label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  display: block;
  margin-bottom: 0.4rem;
}

/* Toggle row layout */
.toggle-row {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}
.toggle-row label { margin-bottom: 0; }

/* ── Inputs ── */
select {
  width: 100%;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border-inner);
  padding: 0.58rem 0.7rem;
  border-radius: var(--radius-ctrl);
  outline: none;
  font-size: 0.875rem;
  color: var(--text-main);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2352527a' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}
select:hover { background-color: rgba(255,255,255,0.9); }
select:focus {
  border-color: var(--aero-accent);
  box-shadow: 0 0 0 3px var(--aero-accent-glow);
}

/* Slider */
.slider-wrap {
  position: relative;
  flex: 1;
  height: 20px;
  display: flex;
  align-items: center;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  background: transparent;
  position: relative;
  z-index: 2;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  background: rgba(0, 0, 0, 0.08);
  height: 5px;
  border-radius: 10px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--aero-accent);
  box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
  margin-top: -6.5px;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 3px 12px rgba(52, 152, 219, 0.5);
}

.slider-fill {
  position: absolute;
  height: 5px;
  left: 0;
  border-radius: 10px;
  background: linear-gradient(to right, var(--frutiger-green), var(--aero-accent));
  pointer-events: none;
  z-index: 1;
  transition: width var(--transition);
}

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.num-input {
  width: 58px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border-inner);
  padding: 0.4rem 0.3rem;
  border-radius: 9px;
  text-align: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--aero-accent);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.num-input:focus {
  border-color: var(--aero-accent);
  box-shadow: 0 0 0 3px var(--aero-accent-glow);
}

/* ── Toggle Switch ── */
.toggle {
  -webkit-appearance: none;
  width: 40px;
  height: 22px;
  background: rgba(0, 0, 0, 0.12);
  border-radius: 20px;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.22s ease;
}
.toggle:checked { background: var(--frutiger-green); }
.toggle::before {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  background: white;
  border-radius: 50%;
  top: 3px; left: 3px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.18);
  transition: transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.toggle:checked::before { transform: translateX(18px); }

/* ── Buttons ── */
.primary-btn,
.secondary-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  border: none;
  padding: 0.85rem;
  border-radius: 13px;
  font-weight: 700;
  font-size: 0.875rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
  font-family: inherit;
}

.primary-btn {
  background: linear-gradient(175deg, #4da8e8 0%, #2575c8 100%);
  color: white;
  box-shadow: 0 4px 16px var(--aero-accent-glow), inset 0 1px 0 rgba(255,255,255,0.25);
}
.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--aero-accent-glow);
  filter: brightness(1.07);
}
.primary-btn:active { transform: translateY(0); }

.secondary-btn {
  background: rgba(255, 255, 255, 0.55);
  color: var(--text-muted);
  border: 1px solid var(--border-soft);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.secondary-btn:hover {
  background: rgba(255,255,255,0.82);
  color: var(--text-main);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0,0,0,0.08);
}
.secondary-btn:active { transform: translateY(0); }

/* GLSL copied state */
.secondary-btn.copied {
  background: rgba(39, 174, 96, 0.15);
  color: var(--frutiger-green);
  border-color: rgba(39, 174, 96, 0.4);
}

/* ── Sidebar Footer ── */
.sidebar-footer {
  margin-top: auto;
  padding-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex-shrink: 0;
}

/* ── Preview Area ── */
.preview-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.canvas-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  /* Dark checkerboard */
  background-image:
    linear-gradient(45deg, #111 25%, transparent 25%),
    linear-gradient(-45deg, #111 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #111 75%),
    linear-gradient(-45deg, transparent 75%, #111 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  background-color: #0a0a0a;
}

.tiling-preview {
  display: flex;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08), 0 0 60px rgba(0,0,0,0.6);
  border-radius: 2px;
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}
.tiling-preview:hover {
  box-shadow: 0 0 0 1px rgba(255,255,255,0.15), 0 0 80px rgba(52,152,219,0.2);
}

canvas {
  image-rendering: pixelated;
  display: block;
}

/* ── Stats Bar ── */
.stats-bar {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10, 10, 10, 0.55);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 5px 14px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  color: rgba(255,255,255,0.6);
  pointer-events: none;
  z-index: 30;
  white-space: nowrap;
}
.stat-sep { opacity: 0.35; }

/* ── Zoom Controls ── */
.preview-info {
  position: absolute;
  bottom: 1.4rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 0.65rem 1.4rem;
  border-radius: 30px;
  z-index: 30;
  box-shadow: 0 8px 28px rgba(0,0,0,0.28);
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.zoom-controls button {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.85);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  cursor: pointer;
  font-weight: bold;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transition: background var(--transition), transform 0.12s ease;
  font-family: inherit;
}
.zoom-controls button:hover {
  background: rgba(255,255,255,0.28);
  transform: scale(1.1);
}
.zoom-controls button:active { transform: scale(0.95); }

#zoomLevel {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
  min-width: 46px;
  text-align: center;
}

#zoomReset { font-size: 0.85rem; }

/* ── Toast Notification ── */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: rgba(27, 27, 40, 0.9);
  color: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 0.65rem 1.2rem;
  border-radius: 12px;
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Scrollbar ── */
.sidebar::-webkit-scrollbar { width: 5px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
  border-radius: 10px;
}
.sidebar::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.22);
}

/* ── Mobile Responsiveness ── */
@media (max-width: 768px) {
  body {
    padding: 0;
    align-items: flex-start;
    overflow: auto;
  }
  .app-container {
    width: 100vw;
    height: 100dvh;
    max-height: none;
    border-radius: 0;
    flex-direction: column;
    border: none;
  }
  .sidebar {
    width: 100%;
    height: auto;
    max-height: 48%;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    padding: 0.9rem;
  }
  .preview-area {
    width: 100%;
    flex: 1;
  }
  .orb { display: none; }
  .toast { bottom: 5rem; right: 1rem; }
}

/* ── Palette Row ── */
.palette-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.palette-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  background: rgba(0,0,0,0.12);
  transition: transform 0.14s ease, border-color 0.14s ease, box-shadow 0.14s ease;
  flex-shrink: 0;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.palette-btn:hover {
  transform: scale(1.15);
  box-shadow: 0 3px 10px rgba(0,0,0,0.18);
}
.palette-btn.active {
  border-color: var(--aero-accent);
  box-shadow: 0 0 0 3px var(--aero-accent-glow);
  transform: scale(1.1);
}

/* ── Drop Zone ── */
.dropzone {
  border: 2px dashed rgba(0,0,0,0.14);
  border-radius: var(--radius-ctrl);
  padding: 14px 10px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  background: rgba(255,255,255,0.35);
}
.dropzone:hover,
.dropzone:focus {
  border-color: var(--aero-accent);
  background: rgba(52,152,219,0.07);
  color: var(--aero-accent);
  outline: none;
}
.dropzone.drag-over {
  border-color: var(--frutiger-green);
  background: rgba(39,174,96,0.09);
  color: var(--frutiger-green);
}
.dropzone svg { opacity: 0.55; }
.dropzone.has-image {
  border-style: solid;
  border-color: var(--frutiger-green);
  background: rgba(39,174,96,0.07);
  color: var(--frutiger-green);
}

/* ── Keyboard Hints ── */
.kbd-hint {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 10px;
  padding: 10px 2px 2px;
  border-top: 1px solid rgba(0,0,0,0.06);
  margin-top: 2px;
  flex-shrink: 0;
}
.kbd-hint span {
  font-size: 0.67rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(0,0,0,0.13);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 5px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-main);
  min-width: 20px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.08);
}