*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#a78bfa;--secondary:#34d399;
  --bg:#0f0f14;--bg-surface:#18181f;--bg-card:#1e1e28;
  --border:rgba(255,255,255,.08);--border-hover:rgba(167,139,250,.3);
  --text:#e8e8f0;--text-muted:#8888a8;--text-faint:#555570;
  --radius-sm:8px;--radius-md:14px;--radius-lg:20px;
  --transition:.2s cubic-bezier(.4,0,.2,1)
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* ── HEADER ── */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,15,20,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;gap:24px;height:64px;width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-icon{width:36px;height:36px}
.logo-text{font-size:1.1rem;font-weight:700;letter-spacing:-.02em;background:linear-gradient(135deg,#fff 40%,var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-link{padding:6px 14px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;color:var(--text-muted);transition:all var(--transition)}
.nav-link:hover,.nav-link.active{color:var(--text);background:rgba(255,255,255,.06)}

/* ── LAYOUT ── */
.main-wrap{width:100%;max-width:1280px;margin-inline:auto;padding:clamp(20px,3vw,40px) clamp(16px,4vw,48px) clamp(40px,6vw,80px)}

/* ── HERO ── */
.tool-hero{text-align:center;padding:clamp(20px,3vw,40px) 0 clamp(24px,3vw,36px)}
.tool-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 14px;border-radius:999px;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.2);color:#6ee7b7;margin-bottom:14px}
.tool-title{font-size:clamp(2rem,5vw,3.2rem);font-weight:900;letter-spacing:-.04em;line-height:1.1;margin-bottom:10px}
.gradient-title{background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.tool-subtitle{font-size:clamp(.95rem,2vw,1.1rem);color:var(--text-muted);max-width:560px;margin:0 auto}

/* ── MAIN TOOL GRID ── */
.tool-grid{display:grid;grid-template-columns:1fr 380px;gap:24px;align-items:start}

/* ── PREVIEW PANEL ── */
.preview-panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}
.preview-area{width:100%;min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:32px 28px;transition:background .25s ease,color .25s ease;position:relative}
.preview-text-normal{font-size:1.1rem;font-weight:500;text-align:center;line-height:1.6;transition:color .25s ease}
.preview-text-large{font-size:1.6rem;font-weight:700;text-align:center;line-height:1.4;transition:color .25s ease}
.preview-text-ui{font-size:.85rem;font-weight:600;text-align:center;transition:color .25s ease}
.preview-label{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;opacity:.5;margin-top:-14px}

/* ── RATIO DISPLAY ── */
.ratio-display{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-top:1px solid var(--border);flex-wrap:wrap;gap:12px}
.ratio-big{display:flex;align-items:baseline;gap:6px}
.ratio-number{font-size:2.4rem;font-weight:900;letter-spacing:-.04em;line-height:1}
.ratio-unit{font-size:1rem;font-weight:600;color:var(--text-muted)}
.ratio-label{font-size:.75rem;color:var(--text-faint)}
.wcag-badges{display:flex;gap:8px;flex-wrap:wrap}
.wcag-badge{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:700;transition:all .25s ease}
.wcag-badge .badge-icon{width:16px;height:16px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.6rem;font-weight:900;flex-shrink:0}
.badge-pass{background:rgba(52,211,153,.12);color:#6ee7b7;border:1px solid rgba(52,211,153,.25)}
.badge-pass .badge-icon{background:#34d399;color:#064e3b}
.badge-fail{background:rgba(248,113,113,.1);color:#fca5a5;border:1px solid rgba(248,113,113,.2)}
.badge-fail .badge-icon{background:#ef4444;color:#fff}
.badge-warn{background:rgba(251,191,36,.1);color:#fde68a;border:1px solid rgba(251,191,36,.2)}
.badge-warn .badge-icon{background:#fbbf24;color:#78350f}

/* ── CONTROLS PANEL ── */
.controls-panel{display:flex;flex-direction:column;gap:16px}
.ctrl-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px}
.ctrl-card-title{font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:14px}

/* ── COLOR INPUT ROW ── */
.color-input-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.color-input-row:last-child{margin-bottom:0}
.color-swatch-wrap{position:relative;width:40px;height:40px;border-radius:10px;overflow:hidden;border:2px solid rgba(255,255,255,.12);flex-shrink:0;cursor:pointer}
.color-swatch-wrap input[type="color"]{position:absolute;inset:-6px;width:calc(100%+12px);height:calc(100%+12px);opacity:0;cursor:pointer}
.color-swatch-bg{position:absolute;inset:0;pointer-events:none}
.color-input-fields{flex:1;display:flex;flex-direction:column;gap:5px}
.color-input-label{font-size:.75rem;font-weight:700;color:var(--text-faint);letter-spacing:.04em}
.color-hex-input{width:100%;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;color:var(--text);font-size:.88rem;font-family:'Fira Code',monospace;transition:border-color var(--transition)}
.color-hex-input:focus{outline:none;border-color:var(--primary)}
.btn-swap{width:100%;padding:9px;border-radius:var(--radius-sm);font-size:.82rem;font-weight:700;color:var(--text-muted);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;gap:6px;transition:all var(--transition)}
.btn-swap:hover{border-color:var(--border-hover);color:var(--text);background:rgba(167,139,250,.06)}
.btn-swap svg{width:14px;height:14px}

/* ── WCAG TABLE ── */
.wcag-table{width:100%;border-collapse:collapse;font-size:.84rem}
.wcag-table th{padding:8px 10px;text-align:left;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);border-bottom:1px solid var(--border)}
.wcag-table td{padding:9px 10px;border-bottom:1px solid rgba(255,255,255,.04);color:var(--text-muted)}
.wcag-table td:first-child{font-weight:600;color:var(--text);font-size:.82rem}
.wcag-table tr:last-child td{border-bottom:none}
.result-badge{display:inline-flex;align-items:center;gap:4px;padding:3px 9px;border-radius:999px;font-size:.72rem;font-weight:700}
.result-pass{background:rgba(52,211,153,.12);color:#6ee7b7;border:1px solid rgba(52,211,153,.2)}
.result-fail{background:rgba(248,113,113,.1);color:#fca5a5;border:1px solid rgba(248,113,113,.2)}

/* ── SAFE COLORS ── */
.safe-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:6px;margin-top:6px}
.safe-swatch{width:100%;aspect-ratio:1;border-radius:6px;cursor:pointer;border:2px solid transparent;transition:all var(--transition);position:relative}
.safe-swatch:hover{transform:scale(1.12);border-color:rgba(255,255,255,.3)}
.safe-swatch.selected{border-color:var(--primary);box-shadow:0 0 0 2px rgba(167,139,250,.3)}
.safe-swatch-pass{outline:2px solid rgba(52,211,153,.4)}

/* ── REPORT ── */
.report-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;margin-top:24px}
.report-title{font-size:.88rem;font-weight:800;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.report-title svg{width:18px;height:18px;color:var(--primary)}
.report-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.report-item{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:14px}
.report-item-label{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);margin-bottom:6px}
.report-item-value{font-size:1.1rem;font-weight:800}
.report-item-sub{font-size:.75rem;color:var(--text-muted);margin-top:3px}
.btn-copy-report{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:var(--radius-sm);font-size:.83rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;margin-top:16px;transition:opacity var(--transition)}
.btn-copy-report:hover{opacity:.85}
.btn-copy-report svg{width:14px;height:14px}
.btn-copy-report.copied{background:linear-gradient(135deg,#34d399,#059669)}

/* ── QUICK PAIRS ── */
.pairs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
.pair-card{border-radius:var(--radius-sm);padding:12px 10px;cursor:pointer;border:2px solid transparent;transition:all var(--transition);text-align:center}
.pair-card:hover{transform:translateY(-2px);border-color:rgba(255,255,255,.2)}
.pair-card.selected{border-color:var(--primary)}
.pair-card-ratio{font-size:.9rem;font-weight:800;line-height:1}
.pair-card-names{font-size:.65rem;margin-top:4px;opacity:.75;line-height:1.3}
.pair-pass-badge{font-size:.6rem;font-weight:700;padding:1px 6px;border-radius:999px;margin-top:4px;display:inline-block}

/* ── INFO TABS ── */
.info-tabs-section{margin-top:clamp(32px,4vw,56px)}
.info-tabs-nav{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:24px;border-bottom:1px solid var(--border)}
.info-tab-btn{padding:10px 18px;border-radius:var(--radius-sm) var(--radius-sm) 0 0;font-size:.88rem;font-weight:600;color:var(--text-muted);transition:all var(--transition);border-bottom:2px solid transparent;margin-bottom:-1px}
.info-tab-btn.active,.info-tab-btn:hover{color:var(--text);border-bottom-color:var(--primary)}
.info-tab-btn.active{background:rgba(167,139,250,.06)}
.info-tab-panel{display:none}
.info-tab-panel.active{display:block}
.info-content h3{font-size:1rem;font-weight:700;margin-bottom:10px;color:var(--text)}
.info-content p{font-size:.9rem;color:var(--text-muted);line-height:1.8;margin-bottom:14px}
.info-content ul,.info-content ol{color:var(--text-muted);padding-left:20px;font-size:.9rem}
.info-content li{margin-bottom:8px;line-height:1.7}
.info-content code{background:rgba(167,139,250,.1);color:#c4b5fd;padding:2px 6px;border-radius:4px;font-size:.85em;font-family:'Fira Code',monospace}
.formula-box{background:rgba(0,0,0,.3);border:1px solid rgba(255,255,255,.07);border-radius:var(--radius-md);padding:18px 20px;font-family:'Fira Code',monospace;font-size:.85rem;color:#c4b5fd;line-height:1.9;white-space:pre-wrap;margin:14px 0 18px;overflow-x:auto}
.step-list{counter-reset:step;list-style:none;padding-left:0}
.step-list li{position:relative;padding-left:36px;margin-bottom:14px;font-size:.9rem;color:var(--text-muted);line-height:1.75}
.step-list li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-size:.72rem;font-weight:800;display:flex;align-items:center;justify-content:center}
.wcag-level-table{width:100%;border-collapse:collapse;font-size:.86rem;border-radius:var(--radius-md);overflow:hidden;margin:14px 0 18px}
.wcag-level-table th{background:rgba(167,139,250,.08);color:var(--text);padding:10px 14px;text-align:left;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--border)}
.wcag-level-table td{padding:9px 14px;border-bottom:1px solid rgba(255,255,255,.04);color:var(--text-muted)}
.wcag-level-table tr:last-child td{border-bottom:none}
.wcag-level-table td:first-child{font-weight:700;color:var(--text)}

/* ── FAQ ── */
.faq-list{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden}
.faq-q{width:100%;padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.92rem;font-weight:600;color:var(--text);text-align:left;transition:background var(--transition)}
.faq-q:hover{background:rgba(255,255,255,.025)}
.faq-icon{width:20px;height:20px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.82rem;color:var(--text-faint);transition:transform var(--transition)}
.faq-item.open .faq-icon{transform:rotate(45deg);border-color:var(--primary);color:var(--primary)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .25s ease}
.faq-item.open .faq-a{max-height:400px;padding:0 18px 14px}
.faq-a p{font-size:.88rem;color:var(--text-muted);line-height:1.78}

/* ── RELATED ── */
.related-section{padding:clamp(24px,4vw,40px) 0;border-top:1px solid var(--border);margin-top:clamp(32px,4vw,56px)}
.related-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:10px}
.section-title{font-size:1.3rem;font-weight:800}
.btn-view-all{display:inline-flex;align-items:center;gap:5px;padding:7px 16px;border-radius:var(--radius-sm);font-size:.83rem;font-weight:600;border:1px solid var(--border);color:var(--text-muted);transition:all var(--transition)}
.btn-view-all:hover{border-color:var(--primary);color:var(--text)}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.related-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;display:flex;flex-direction:column;gap:8px;transition:all var(--transition)}
.related-card:hover{border-color:rgba(167,139,250,.4);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.related-icon{width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center}
.related-icon svg{width:18px;height:18px;color:#fff}
.related-name{font-size:.88rem;font-weight:700}
.related-desc{font-size:.78rem;color:var(--text-muted);line-height:1.5;flex:1}
.related-link{font-size:.78rem;font-weight:600;color:var(--primary)}

/* ── AD ── */
.ad-slot{background:var(--bg-card);border:1px dashed rgba(255,255,255,.06);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-faint);font-size:.75rem;min-height:90px}

/* ── TOAST ── */
.toast{position:fixed;bottom:28px;right:28px;padding:11px 20px;background:#1e1e28;border:1px solid rgba(52,211,153,.4);border-radius:var(--radius-md);font-size:.85rem;font-weight:600;color:#6ee7b7;box-shadow:0 8px 32px rgba(0,0,0,.4);opacity:0;transform:translateY(10px);transition:all .25s ease;pointer-events:none;z-index:999}
.toast.show{opacity:1;transform:translateY(0)}

/* ── FOOTER ── */
.site-footer{background:var(--bg-surface);border-top:1px solid var(--border);padding:clamp(28px,4vw,48px) 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px;width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}
.footer-brand-text{font-size:.88rem;color:var(--text-muted);line-height:1.7;margin-top:10px;max-width:240px}
.footer-heading{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:12px}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{font-size:.88rem;color:var(--text-muted);transition:color var(--transition)}
.footer-links a:hover{color:var(--text)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:20px;border-top:1px solid var(--border);flex-wrap:wrap;gap:10px;font-size:.82rem;color:var(--text-faint);width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}

@media(max-width:900px){.tool-grid{grid-template-columns:1fr}}
@media(max-width:640px){.footer-grid{grid-template-columns:1fr}.pairs-grid{grid-template-columns:repeat(3,1fr)}}