:root {
  --primary: #6C5CE7;
  --primary-dim: rgba(108,92,231,0.12);
  --secondary: #A29BFE;
  --accent: #00CEC9;
  --accent-dim: rgba(0,206,201,0.12);
  --bg: #0A0A1A;
  --bg-card: rgba(10,10,26,0.85);
  --bg-input: rgba(6,6,18,0.9);
  --border: rgba(108,92,231,0.12);
  --border-hover: rgba(108,92,231,0.25);
  --text: #E2E8F0;
  --text-dim: #94A3B8;
  --text-muted: #64748B;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --transition: 250ms ease;
  --glass: rgba(10,10,26,0.65);
  --glass-border: rgba(108,92,231,0.08);
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font); background: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.6;
  background-image:
    radial-gradient(ellipse at 15% 0%, rgba(108,92,231,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 100%, rgba(0,206,201,0.04) 0%, transparent 50%);
}
.app { max-width: 1400px; margin: 0 auto; padding: 0 24px; display: flex; flex-direction: column; min-height: 100vh; }

.header { padding: 16px 0; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.header-left { display: flex; align-items: center; gap: 12px; }
.logo { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; }
.header h1 { font-size: 1.2rem; font-weight: 700; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: var(--radius-sm); border: none; font-family: var(--font); font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: all var(--transition); white-space: nowrap; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: #5B4BD5; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { color: var(--text); background: var(--primary-dim); }
.btn-ghost.active { background: var(--primary-dim); color: var(--text); border-color: var(--primary); }
.btn-sm { padding: 6px 12px; font-size: 0.78rem; }

.main { flex: 1; display: grid; grid-template-columns: 300px 1fr; gap: 16px; padding: 16px 0; align-items: start; }

.panel { background: var(--glass); backdrop-filter: blur(12px); border: 1px solid var(--glass-border); border-radius: var(--radius); display: flex; flex-direction: column; overflow: hidden; animation: fadeIn 0.3s ease; }
.panel-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; gap: 6px; }
.panel-header h2 { font-size: 0.88rem; font-weight: 600; }
.panel-body { padding: 16px; flex: 1; overflow-y: auto; }

.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 0.72rem; font-weight: 600; color: var(--text-dim); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.input { width: 100%; padding: 8px 12px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-family: var(--font); font-size: 0.82rem; outline: none; transition: all var(--transition); }
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-dim); }
.input-sm { padding: 5px 8px; font-size: 0.78rem; font-family: var(--mono); }
select.input { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394A3B8' d='M3 5l3 3 3-3'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 28px; cursor: pointer; }

.divider { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.section-title { font-size: 0.78rem; font-weight: 600; color: var(--text-dim); margin-bottom: 8px; }

.upload-area { border: 2px dashed var(--border); border-radius: var(--radius-sm); padding: 20px; text-align: center; cursor: pointer; transition: all var(--transition); font-size: 0.82rem; color: var(--text-dim); }
.upload-area:hover, .upload-area.drag-over { border-color: var(--primary); background: var(--primary-dim); }

.color-pair { display: flex; gap: 12px; margin-bottom: 10px; }
.color-input-group { flex: 1; }
.color-input-group label { display: block; font-size: 0.7rem; font-weight: 600; color: var(--text-dim); margin-bottom: 4px; }
.color-picker { width: 100%; height: 36px; border: none; border-radius: 6px; cursor: pointer; background: transparent; margin-bottom: 4px; }

.contrast-result { padding: 10px; background: var(--bg-input); border-radius: var(--radius-sm); text-align: center; border: 1px solid var(--border); margin-bottom: 10px; }
.contrast-ratio { font-size: 1.4rem; font-weight: 700; font-family: var(--mono); color: var(--accent); }
.contrast-badges { display: flex; gap: 6px; justify-content: center; margin-top: 6px; flex-wrap: wrap; }
.badge { padding: 3px 8px; border-radius: 4px; font-size: 0.7rem; font-weight: 600; }
.badge-pass { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-fail { background: rgba(239,68,68,0.15); color: var(--danger); }

.palette-textarea { min-height: 40px; resize: vertical; font-family: var(--mono); font-size: 0.78rem; }
.palette-results { margin-top: 10px; }
.palette-swatch { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 8px; }
.swatch { width: 28px; height: 28px; border-radius: 6px; border: 2px solid var(--border); }
.palette-score { font-size: 0.78rem; color: var(--text-dim); }

.preview-body { min-height: 400px; }
.preview-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.preview-grid.single { grid-template-columns: 1fr; }
.preview-slot h3 { font-size: 0.78rem; font-weight: 600; color: var(--text-dim); margin-bottom: 6px; text-align: center; }
.preview-canvas { width: 100%; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg-input); display: block; }
.no-image { text-align: center; color: var(--text-muted); padding: 60px 20px; font-size: 0.88rem; }
.view-toggle { display: flex; gap: 4px; }

.footer { padding: 16px 0; text-align: center; font-size: 0.72rem; color: var(--text-muted); border-top: 1px solid var(--border); margin-top: auto; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }
@media (max-width: 900px) { .main { grid-template-columns: 1fr; } .preview-grid { grid-template-columns: 1fr; } }