/* ============================================================
   FILMOVÁ KOPÍRKA — Design System
   ============================================================ */

:root {
  --bg-base:        #0a0a0f;
  --bg-surface:     #111118;
  --bg-card:        #16161f;
  --bg-card-hover:  #1c1c28;
  --border:         rgba(255,255,255,0.07);
  --border-bright:  rgba(255,255,255,0.14);

  --text-primary:   #f0eff8;
  --text-secondary: #8a8aa8;
  --text-muted:     #4a4a68;

  /* Channel colors */
  --red:     #ff4455;
  --green:   #22dd88;
  --blue:    #4488ff;
  --cyan:    #00e5ff;
  --magenta: #e040fb;
  --yellow:  #ffee00;

  --accent:  #c084fc;
  --radius:  12px;
  --radius-lg: 20px;
  --shadow:  0 8px 32px rgba(0,0,0,0.6);
  --shadow-card: 0 4px 16px rgba(0,0,0,0.4);

  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'Space Mono', monospace;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  padding-top: 64px;
}

/* ---- Film grain overlay ---- */
.grain-overlay {
  position: fixed; inset: 0; pointer-events: none; z-index: 999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.022;
  mix-blend-mode: overlay;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  border-bottom: 1px solid var(--border);
  background: #0d0d17;
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 2rem;
  height: 64px;
}
.header-inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; gap: 2rem;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 0.6rem;
  flex-shrink: 0;
}
.logo-icon {
  font-size: 1rem;
  background: conic-gradient(from 0deg, #ff4455, #ffee00, #22dd88, #4488ff, #e040fb, #ff4455);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: spin-hue 6s linear infinite;
}
@keyframes spin-hue {
  to { filter: hue-rotate(360deg); }
}
.logo-text {
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  text-transform: uppercase;
}
.logo-text strong {
  color: var(--text-primary);
  font-weight: 700;
}
.header-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
  border-left: 1px solid var(--border);
  padding-left: 2rem;
}

/* ============================================================
   MAIN LAYOUT
   ============================================================ */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ============================================================
   MODE SWITCHER
   ============================================================ */
.mode-switcher-section {
  display: flex;
  justify-content: center;
}
.mode-tabs {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px;
  gap: 4px;
}
.mode-tab {
  display: flex; flex-direction: column; align-items: center;
  gap: 2px;
  padding: 10px 32px;
  border-radius: 999px;
  border: none; cursor: pointer;
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative; overflow: hidden;
}
.mode-tab::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(192,132,252,0.15), rgba(96,165,250,0.15));
  opacity: 0; transition: opacity 0.3s;
  border-radius: 999px;
}
.mode-tab.active {
  background: linear-gradient(135deg, rgba(192,132,252,0.2), rgba(96,165,250,0.12));
  color: var(--text-primary);
  box-shadow: inset 0 0 0 1px rgba(192,132,252,0.3), 0 4px 20px rgba(192,132,252,0.1);
}
.mode-tab:hover:not(.active)::before { opacity: 1; }
.tab-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.07);
}
.additive-badge  { color: #f0a0a8; border: 1px solid rgba(255,68,85,0.4); }
.subtractive-badge { color: #a0d8f0; border: 1px solid rgba(0,229,255,0.4); }
.mode-tab.active .additive-badge  { background: rgba(255,68,85,0.2); }
.mode-tab.active .subtractive-badge { background: rgba(0,229,255,0.15); }
.tab-label {
  font-size: 0.9rem; font-weight: 600;
  letter-spacing: 0.01em;
}
.tab-desc {
  font-size: 0.72rem; color: var(--text-muted);
}
.mode-tab.active .tab-desc { color: var(--text-secondary); }

/* ============================================================
   INFO BANNER
   ============================================================ */
.info-banner {
  background: linear-gradient(135deg, rgba(192,132,252,0.08), rgba(96,165,250,0.06));
  border: 1px solid rgba(192,132,252,0.2);
  border-radius: var(--radius);
  padding: 0.9rem 1.4rem;
  animation: fadein 0.4s ease;
}
.info-banner-inner {
  display: flex; align-items: flex-start; gap: 0.8rem;
}
.info-icon {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(192,132,252,0.25);
  color: var(--accent);
  font-size: 0.8rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 2px;
}
.info-text {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.info-text strong { color: var(--text-primary); }

/* ============================================================
   WORKSPACE
   ============================================================ */
.workspace {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ============================================================
   CONTROLS PANEL
   ============================================================ */
.controls-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex; flex-direction: column; gap: 1.2rem;
  box-shadow: var(--shadow-card);
}
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
}
.panel-title {
  font-size: 1rem; font-weight: 600;
  color: var(--text-primary);
}
.reset-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 5px 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}
.reset-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
  border-color: var(--border-bright);
}

/* ---- Slider Cards ---- */
.sliders-group { display: flex; flex-direction: column; gap: 1rem; }
.hidden { display: none !important; }

.slider-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
}
.slider-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.slider-card-header {
  display: flex; align-items: center; gap: 0.8rem;
  margin-bottom: 0.9rem;
}
.color-dot {
  width: 12px; height: 12px; border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}
.dot-red     { background: var(--red);     color: var(--red); }
.dot-green   { background: var(--green);   color: var(--green); }
.dot-blue    { background: var(--blue);    color: var(--blue); }
.dot-cyan    { background: var(--cyan);    color: var(--cyan); }
.dot-magenta { background: var(--magenta); color: var(--magenta); }
.dot-yellow  { background: var(--yellow);  color: var(--yellow); }

.slider-labels { flex: 1; }
.channel-name {
  display: block; font-size: 0.88rem; font-weight: 600;
  color: var(--text-primary);
}
.channel-sub {
  display: block; font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.08em;
}
.slider-value-badge {
  font-family: var(--font-mono);
  font-size: 0.95rem; font-weight: 700;
  min-width: 2.4rem; text-align: right;
  color: var(--text-primary);
  transition: color 0.2s;
}

/* ---- Slider Track ---- */
.slider-track-wrap {
  display: flex; align-items: center; gap: 0.7rem;
}
.slider-end-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  white-space: nowrap;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.slider {
  -webkit-appearance: none;
  flex: 1; height: 6px; border-radius: 999px;
  cursor: pointer; outline: none;
  transition: height 0.2s;
}
.slider:hover { height: 8px; }
.slider:focus { outline: none; }

/* Slider track fills by color */
.slider-red     { background: linear-gradient(to right, #220011, #ff4455); }
.slider-green   { background: linear-gradient(to right, #001a0a, #22dd88); }
.slider-blue    { background: linear-gradient(to right, #00083a, #4488ff); }
.slider-cyan    { background: linear-gradient(to right, #002033, #00e5ff); }
.slider-magenta { background: linear-gradient(to right, #200033, #e040fb); }
.slider-yellow  { background: linear-gradient(to right, #1a1500, #ffee00); }

/* Thumb */
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff;
  border: 3px solid rgba(0,0,0,0.3);
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  transition: transform 0.15s, box-shadow 0.15s;
}
.slider:hover::-webkit-slider-thumb,
.slider:active::-webkit-slider-thumb {
  transform: scale(1.2);
  box-shadow: 0 4px 16px rgba(0,0,0,0.6);
}
.slider::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid rgba(0,0,0,0.3);
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  cursor: pointer;
}

/* ---- Effect hint ---- */
.effect-hint {
  margin-top: 0.6rem;
  font-size: 0.73rem;
  color: var(--text-muted);
  min-height: 1rem;
  transition: color 0.3s, opacity 0.3s;
  font-style: italic;
  line-height: 1.4;
}
.effect-hint.active { color: #a0b4ff; opacity: 1; }

/* ---- Mix Indicator ---- */
.mix-indicator {
  margin-top: 0.4rem;
  padding: 1rem;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.mix-label {
  font-size: 0.72rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}
.mix-swatch {
  height: 40px; border-radius: 8px;
  transition: background-color 0.3s ease;
  border: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 0.5rem;
}
.mix-rgb-readout {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-align: center;
}

/* ============================================================
   PREVIEW PANEL
   ============================================================ */
.preview-panel {
  display: flex; flex-direction: column; gap: 0.8rem;
}
.preview-header {
  display: flex; align-items: center; justify-content: space-between;
}
.preview-label {
  font-size: 0.8rem; font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.12em;
}
.preview-controls {
  display: flex; align-items: center; gap: 0.5rem;
}
.compare-btn {
  font-size: 0.75rem;
  padding: 6px 14px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}
.compare-btn:hover, .compare-btn:active {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}
.upload-btn {
  font-size: 0.75rem;
  padding: 6px 14px;
  background: rgba(192,132,252,0.1);
  border: 1px solid rgba(192,132,252,0.3);
  color: var(--accent);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
  white-space: nowrap;
}
.upload-btn:hover {
  background: rgba(192,132,252,0.2);
  border-color: rgba(192,132,252,0.5);
  color: #dbb4ff;
}

/* ---- Image Frame ---- */
.image-frame {
  position: relative;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  aspect-ratio: 1 / 1;
}
.frame-grain {
  position: absolute; inset: 0; z-index: 3; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 128 128' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: 0.04; mix-blend-mode: overlay;
}
.light-leak {
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  opacity: 0; transition: opacity 0.4s;
  background: radial-gradient(ellipse at 10% 15%, rgba(255,180,80,0.25) 0%, transparent 50%);
}
.canvas-container {
  position: relative; width: 100%; height: 100%;
}
#output-canvas {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: filter 0.05s;
}
.scan-line {
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.06), transparent);
  animation: scan 3s linear infinite;
  pointer-events: none; z-index: 4;
}
@keyframes scan {
  from { top: 0%; }
  to   { top: 100%; }
}

/* ---- Sprockets ---- */
.sprockets {
  position: absolute; top: 0; bottom: 0;
  display: flex; flex-direction: column;
  justify-content: space-around;
  align-items: center;
  padding: 12px 0;
  width: 22px; z-index: 5;
}
.left-sprockets  { left: 0; }
.right-sprockets { right: 0; }
.sprocket {
  width: 10px; height: 10px; border-radius: 2px;
  background: #000;
  border: 1px solid rgba(255,255,255,0.15);
  box-shadow: inset 0 0 4px rgba(255,255,255,0.1);
}

/* ---- Cast Bar ---- */
.cast-bar {
  display: flex; align-items: center; justify-content: center;
}
.cast-indicator {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 6px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  transition: all 0.3s;
}
.cast-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #fff;
  transition: background-color 0.3s, box-shadow 0.3s;
}

/* ============================================================
   PHYSICS CARDS
   ============================================================ */
.physics-cards {
  margin-top: 1rem;
}
.physics-title {
  font-size: 1rem; font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 1rem;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.physics-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  display: flex; flex-direction: column; gap: 0.6rem;
  transition: border-color 0.3s, transform 0.2s;
  animation: fadein 0.5s ease both;
}
.physics-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-2px);
}
.pc-header {
  display: flex; align-items: center; gap: 0.6rem;
}
.pc-dot {
  width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0;
}
.pc-action {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.1em;
}
.pc-title {
  font-size: 0.88rem; font-weight: 600;
  color: var(--text-primary);
}
.pc-arrow {
  font-size: 1.1rem;
  color: var(--text-muted);
  text-align: center;
}
.pc-result {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.pc-result strong { color: var(--text-primary); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadein {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.mode-tab, .slider-card, .controls-panel, .preview-panel { animation: fadein 0.4s ease; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .header-subtitle { display: none; }
}
@media (max-width: 600px) {
  .main-content { padding: 1rem 1rem 3rem; }
  .mode-tab { padding: 8px 16px; }
  .tab-desc { display: none; }
}