/* Accessibility Contrast Grid — A11y Blue Theme */
:root {
  --primary:#0984E3;--primary-light:#74B9FF;--primary-dark:#0771C5;
  --pass:#2ECC71;--pass-light:#A3E4BD;--fail:#E74C3C;--fail-light:#F1948A;
  --warn:#F39C12;--warn-light:#F9CF80;
  --bg-base:#0F0F1A;--bg-surface:#161625;--bg-elevated:#1F1F32;
  --bg-glass:rgba(22,22,37,0.7);--bg-glass-border:rgba(9,132,227,0.12);
  --text-primary:#F1F5F9;--text-secondary:#94A3B8;--text-muted:#64748B;
  --border:rgba(9,132,227,0.15);--border-strong:rgba(9,132,227,0.3);
  --radius:8px;--radius-sm:6px;
  --shadow:0 4px 24px rgba(0,0,0,0.35);
  --font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','Fira Code','Consolas',monospace;
  --transition:200ms ease;
}
[data-theme="light"]{
  --bg-base:#F8F9FA;--bg-surface:#FFFFFF;--bg-elevated:#F1F3F5;
  --bg-glass:rgba(255,255,255,0.8);--bg-glass-border:rgba(9,132,227,0.15);
  --text-primary:#1A202C;--text-secondary:#4A5568;--text-muted:#A0AEC0;
  --border:rgba(9,132,227,0.12);--border-strong:rgba(9,132,227,0.25);
  --shadow:0 2px 12px rgba(0,0,0,0.08);
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);background:var(--bg-base);color:var(--text-primary);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;transition:background-color .3s,color .3s}
.glass-card{background:var(--bg-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--bg-glass-border);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);transition:border-color var(--transition)}
.glass-card:hover{border-color:var(--border-strong)}
.app-header{position:sticky;top:0;z-index:100;background:var(--bg-glass);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:.75rem 1.5rem}
.header-content{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.logo-group{display:flex;align-items:center;gap:.75rem}
.logo-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:rgba(9,132,227,.1);border-radius:var(--radius-sm);border:1px solid rgba(9,132,227,.2)}
.app-header h1{font-size:1.15rem;font-weight:700;background:linear-gradient(135deg,var(--primary-light),var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{font-size:.75rem;color:var(--text-muted)}
.container{max-width:1200px;margin:0 auto;padding:2rem 1.5rem;width:100%;flex:1;display:flex;flex-direction:column;gap:1.25rem}
.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.55rem 1rem;font-family:var(--font-sans);font-size:.85rem;font-weight:500;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);background:var(--bg-elevated);color:var(--text-primary)}
.btn:hover{border-color:var(--primary);background:rgba(9,132,227,.1)}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));border-color:var(--primary);color:#fff;box-shadow:0 2px 12px rgba(9,132,227,.3)}
.btn-primary:hover{box-shadow:0 4px 20px rgba(9,132,227,.4);transform:translateY(-1px)}
.btn-sm{padding:.35rem .7rem;font-size:.8rem}
.btn-row{display:flex;gap:.5rem;margin-top:.75rem;flex-wrap:wrap}
.section-title{display:flex;align-items:center;gap:.5rem;font-size:1rem;font-weight:600;color:var(--primary-light);margin-bottom:1rem}
.code-textarea{width:100%;padding:1rem;font-family:var(--font-mono);font-size:.8rem;line-height:1.7;color:var(--text-primary);background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-sm);resize:vertical;transition:border-color var(--transition)}
.code-textarea:focus{outline:none;border-color:var(--primary)}
/* Color Inputs */
.color-inputs{display:flex;flex-wrap:wrap;gap:.5rem}
.color-chip{display:flex;align-items:center;gap:.4rem;padding:.3rem .5rem;background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-sm);transition:border-color var(--transition)}
.color-chip:hover{border-color:var(--primary)}
.color-chip input[type=color]{width:28px;height:28px;border:none;background:none;cursor:pointer;border-radius:4px}
.color-chip input[type=text]{width:80px;font-family:var(--font-mono);font-size:.78rem;background:transparent;border:none;color:var(--text-primary);outline:none}
.color-chip .remove-color{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:1rem;padding:0 .2rem;transition:color var(--transition)}
.color-chip .remove-color:hover{color:var(--fail)}
/* Grid */
.grid-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.5rem}
.grid-header .section-title{margin-bottom:0}
.grid-legend{display:flex;gap:.75rem;font-size:.72rem;color:var(--text-muted)}
.legend-item{display:flex;align-items:center;gap:.3rem}
.legend-dot{width:12px;height:12px;border-radius:3px}
.pass-aaa{background:var(--pass)}
.pass-aa{background:var(--warn)}
.pass-aa-large{background:var(--primary)}
.fail{background:var(--fail)}
.grid-scroll{overflow-x:auto;margin-top:1rem}
.contrast-grid{border-collapse:collapse;width:100%;min-width:400px}
.contrast-grid th,.contrast-grid td{padding:.4rem;text-align:center;font-size:.72rem;border:1px solid var(--border);min-width:60px}
.contrast-grid th{font-weight:600;color:var(--text-secondary);background:var(--bg-elevated)}
.contrast-grid td{cursor:pointer;transition:transform var(--transition),box-shadow var(--transition);position:relative}
.contrast-grid td:hover{transform:scale(1.1);z-index:1;box-shadow:0 2px 8px rgba(0,0,0,.3)}
.cell-ratio{font-weight:700;font-size:.7rem;font-family:var(--font-mono)}
.cell-label{display:block;font-size:.58rem;font-weight:600;margin-top:.1rem}
/* Detail Panel */
.detail-content{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.detail-preview{padding:2rem;border-radius:var(--radius-sm);text-align:center;font-size:1.1rem;font-weight:600}
.detail-info{display:flex;flex-direction:column;gap:.4rem;font-size:.82rem}
.detail-row{display:flex;justify-content:space-between;padding:.25rem 0;border-bottom:1px solid var(--border)}
.detail-row strong{color:var(--text-primary)}
.detail-row span{font-family:var(--font-mono);color:var(--text-secondary)}
/* Modal */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:300}
.modal{max-width:500px;width:90%;padding:1.5rem}
.modal h3{font-size:1rem;margin-bottom:.75rem;color:var(--primary-light)}
/* Toast */
.toast{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--bg-elevated);border:1px solid var(--primary);color:var(--primary-light);padding:.5rem 1rem;border-radius:var(--radius-sm);font-size:.8rem;z-index:200;transform:translateY(80px);opacity:0;transition:all .3s;pointer-events:none}
.toast.show{transform:translateY(0);opacity:1}
.app-footer{text-align:center;padding:1.5rem;font-size:.75rem;color:var(--text-muted);border-top:1px solid var(--border)}
@media(max-width:768px){.container{padding:1rem}.glass-card{padding:1rem}.detail-content{grid-template-columns:1fr}}
@media(max-width:480px){.app-header h1{font-size:1rem}.logo-icon{display:none}}