:root {
  --bg: #0d0f18;
  --bg-card: #151828;
  --bg-input: #0a0c14;
  --text: #e4e6f0;
  --text-secondary: #8e92a8;
  --text-muted: #5a5e72;
  --primary: #a78bfa;
  --primary-light: #c4b5fd;
  --accent: #34d399;
  --error: #fb7185;
  --warn: #fbbf24;
  --border: rgba(167,139,250,0.1);
  --border-strong: rgba(167,139,250,0.25);
  --shadow: 0 4px 14px rgba(0,0,0,0.4);
  --radius: 12px;
  --font: 'Inter',-apple-system,sans-serif;
  --transition: 0.25s ease;
  --glass: rgba(21,24,40,0.92);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh}

.header{background:var(--glass);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.header-inner{max-width:700px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:8px}
.logo h1{font-size:1rem;font-weight:700;color:var(--primary-light)}

.btn{padding:6px 12px;border:1px solid var(--border);border-radius:8px;background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:0.78rem;font-weight:500;cursor:pointer;transition:all var(--transition)}
.btn:hover{border-color:var(--primary);color:var(--primary)}

.main{max-width:700px;margin:0 auto;padding:24px 20px}

/* Color Inputs */
.color-inputs{display:flex;align-items:flex-end;gap:12px;margin-bottom:20px}
.color-field{flex:1}
.color-field label{display:block;font-size:0.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:6px}
.color-row{display:flex;gap:6px;align-items:center}
.color-picker{width:44px;height:44px;border:2px solid var(--border-strong);border-radius:8px;cursor:pointer;padding:2px;background:var(--bg-input)}
.color-picker::-webkit-color-swatch-wrapper{padding:0}
.color-picker::-webkit-color-swatch{border-radius:4px;border:none}
.hex-input{flex:1;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg-input);color:var(--text);font-family:var(--font);font-size:0.9rem;font-weight:600;transition:border-color var(--transition)}
.hex-input:focus{outline:none;border-color:var(--primary)}
.swap-btn{padding:10px;font-size:1.1rem;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;margin-bottom:0}

/* Preview */
.preview-card{border-radius:var(--radius);padding:24px;margin-bottom:20px;border:1px solid var(--border);transition:all .3s}
.preview-text.large{font-size:1.3rem;font-weight:700;margin-bottom:8px}
.preview-text.normal{font-size:0.9rem;margin-bottom:6px}
.preview-text.small{font-size:0.75rem}

/* Results */
.results{display:flex;gap:16px;margin-bottom:20px;align-items:stretch;flex-wrap:wrap}
.ratio-display{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;min-width:140px;display:flex;flex-direction:column;align-items:center;justify-content:center}
.ratio-label{font-size:0.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:4px}
.ratio-value{font-size:2rem;font-weight:700;color:var(--primary-light)}

.checks{flex:1;display:grid;grid-template-columns:1fr 1fr;gap:6px}
.check{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between}
.check-label{font-size:0.78rem;font-weight:500;color:var(--text-secondary)}
.badge{font-size:0.72rem;font-weight:600;padding:3px 8px;border-radius:4px}
.badge.pass{background:rgba(52,211,153,0.1);color:var(--accent)}
.badge.fail{background:rgba(251,113,133,0.08);color:var(--error)}

/* Suggestions */
.suggestions-section{margin-top:8px}
.suggestions-section h3{font-size:0.85rem;font-weight:600;margin-bottom:10px;color:var(--primary)}
.suggestions{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
.suggestion{padding:10px;border:1px solid var(--border);border-radius:8px;cursor:pointer;text-align:center;transition:all var(--transition)}
.suggestion:hover{border-color:var(--primary);transform:translateY(-1px)}
.suggestion .swatch{width:100%;height:32px;border-radius:4px;margin-bottom:6px}
.suggestion .hex{font-size:0.72rem;font-weight:600;color:var(--text-secondary)}
.suggestion .contrast{font-size:0.65rem;color:var(--text-muted)}

@media(max-width:640px){
  .color-inputs{flex-direction:column;align-items:stretch}
  .swap-btn{align-self:center;margin:0}
  .results{flex-direction:column}
  .checks{grid-template-columns:1fr 1fr}
}