:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --panel-2: #eef2f7;
  --text: #101828;
  --muted: #64748b;
  --border: #d8dee8;
  --accent: #2563eb;
  --accent-2: #0891b2;
  --danger: #dc2626;
  --ok: #059669;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #080d16;
  --panel: #111827;
  --panel-2: #0f172a;
  --text: #f8fafc;
  --muted: #9aa8bc;
  --border: #263244;
  --accent: #60a5fa;
  --accent-2: #22d3ee;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a { color: var(--accent); text-underline-offset: 3px; }
.wrap { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner, .footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.brand img { width: 34px; height: 34px; border-radius: 8px; }

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.nav a, .icon-button, .tab, .select, button, input, textarea {
  font: inherit;
}

.nav a, .icon-button, .tab, .control-button {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
}

.icon-button { cursor: pointer; min-width: 40px; }

.hero {
  padding: 34px 0 22px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: 0;
  max-width: 900px;
}

.lead {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.08rem;
}

.privacy-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.workbench {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.sidebar {
  display: flex;
  gap: 16px;
  padding: 14px;
  align-items: start;
  flex-wrap: wrap;
}

.group { display: grid; gap: 9px; }
.sidebar .group {
  flex: 1 1 220px;
  min-width: 220px;
}
.sidebar .group:first-child {
  flex: 1 1 100%;
}
.workspace {
  min-width: 0;
}
.group h2, .group h3 { margin: 0; font-size: 1rem; }
.field { display: grid; gap: 6px; }
.field span, label { font-weight: 700; font-size: 0.92rem; }
input[type="file"], input[type="text"], input[type="email"], textarea, select {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 10px;
}
input[type="range"] { width: 100%; }
textarea { min-height: 130px; resize: vertical; }

.lut-load-row {
  display: grid;
  grid-template-columns: minmax(250px, 320px) minmax(0, 1fr);
  gap: 10px;
  align-items: stretch;
  width: 100%;
}
.lut-dropzone {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  align-items: center;
  min-height: 74px;
  padding: 12px;
  border: 1px dashed color-mix(in srgb, var(--accent) 52%, var(--border));
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 12%, transparent), transparent 58%),
    var(--panel-2);
  cursor: pointer;
}
.lut-dropzone:hover {
  border-color: var(--accent);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent 58%),
    var(--panel-2);
}
.lut-dropzone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
.lut-icon {
  grid-row: span 2;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}
.lut-title {
  color: var(--text);
  font-weight: 800;
  line-height: 1.1;
}
.lut-copy {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.2;
}

.status {
  min-height: 74px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  color: var(--muted);
  background: var(--panel-2);
  font-size: 0.9rem;
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 3px;
  line-height: 1.35;
}
.status[data-tone="ok"] { color: var(--ok); }
.status[data-tone="error"] { color: var(--danger); }
.status strong {
  display: inline-block;
  color: var(--text);
  font-weight: 800;
  max-width: 100%;
  overflow-wrap: anywhere;
  font-size: 0.98rem;
  line-height: 1.15;
}

.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tab { cursor: pointer; }
.tab.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--panel));
  color: var(--accent);
}

.preview-panel { overflow: hidden; }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.toolbar-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  flex: 1 1 320px;
  min-width: 260px;
}
.inline-range {
  display: grid;
  gap: 3px;
  min-width: 160px;
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 700;
}
.inline-range input {
  width: 170px;
}
.toolbar h2 {
  margin: 0;
  font-size: 1.05rem;
}

.viewport-shell {
  position: relative;
  aspect-ratio: 16 / 10;
  min-height: 0;
}

.viewport-pane {
  min-height: 0;
  height: 100%;
}

.preview-wrap {
  --split: 50%;
  position: relative;
  width: 100%;
  height: 100%;
  background: #0f172a;
  overflow: hidden;
  cursor: ew-resize;
}
.preview-wrap canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.preview-wrap[data-compare="original"] #outputCanvas { display: none; }
.preview-wrap[data-compare="applied"] #sourceCanvas { display: none; }
.preview-wrap[data-compare="split"] #outputCanvas { clip-path: inset(0 0 0 var(--split)); }
.preview-wrap[data-compare="split"]::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split);
  width: 2px;
  background: #ffffff;
  box-shadow: 0 0 0 1px rgba(0,0,0,.35);
  pointer-events: none;
}
.split-label {
  position: absolute;
  top: 12px;
  z-index: 2;
  padding: 5px 8px;
  border: 1px solid rgba(255, 255, 255, 0.44);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.68);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1;
  pointer-events: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}
.split-label-before { left: 12px; }
.split-label-after { right: 12px; }
.preview-wrap:not([data-compare="split"]) .split-label {
  display: none;
}

.viz-pane {
  padding: 12px;
  height: 100%;
}
.viz-pane > h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}
.viz-pane[data-pane="curves"] {
  display: flex;
  flex-direction: column;
}
.viz-canvas, #cubeCanvas {
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
}
#cubeCanvas {
  height: calc(100% - 52px);
  flex: initial;
}
#cubeCanvas { cursor: grab; touch-action: none; }
.cube-toolbar {
  padding: 0 0 10px;
  border-bottom: 0;
}
.upload-empty {
  display: grid;
  place-items: center;
  padding: 0;
  width: 100%;
  height: 100%;
  color: var(--muted);
  background: var(--panel-2);
}
.upload-dropzone {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  padding: 28px;
  border: 0;
  border-radius: 0;
  background:
    radial-gradient(circle at 50% 42%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 34%),
    var(--panel);
  color: var(--text);
  text-align: center;
  cursor: pointer;
  box-shadow: none;
  outline: 1px dashed color-mix(in srgb, var(--accent) 52%, var(--border));
  outline-offset: -28px;
}
.upload-dropzone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
.upload-dropzone:hover {
  background:
    radial-gradient(circle at 50% 42%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 36%),
    var(--panel);
  outline-color: var(--accent);
}
.upload-icon {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  box-shadow: 0 12px 26px color-mix(in srgb, var(--accent) 34%, transparent);
}
.upload-title {
  font-size: 1.2rem;
  font-weight: 800;
}
.upload-copy {
  max-width: 360px;
  color: var(--muted);
  font-size: 0.95rem;
}
.remove-image-button {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 3;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.72);
  color: #fff;
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
}
.remove-image-button:hover {
  background: rgba(220, 38, 38, 0.86);
}

.content {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.content section, .feedback {
  padding: 18px;
}
.content h2, .feedback h2 { margin-top: 0; }

.feedback {
  margin-top: 16px;
}
.feedback form {
  display: grid;
  gap: 12px;
  max-width: 720px;
}
.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.control-button, button[type="submit"] {
  cursor: pointer;
  width: fit-content;
}
button[type="submit"], .primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.site-footer {
  margin-top: 42px;
  border-top: 1px solid var(--border);
}
.footer-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.muted { color: var(--muted); }

@media (max-width: 900px) {
  .workbench { grid-template-columns: 1fr; }
  .content { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .header-inner, .footer-inner { align-items: flex-start; flex-direction: column; }
  .field-grid { grid-template-columns: 1fr; }
  .viewport-shell { aspect-ratio: 4 / 3; }
  .lut-load-row { grid-template-columns: 1fr; }
}