.stb-app{--stb-border:#dfe4ea;--stb-bg:#fff;--stb-soft:#f6f8fb;--stb-text:#172033;--stb-muted:#667085;--stb-primary:#2563eb;max-width:1100px;margin:28px auto;padding:26px;border:1px solid var(--stb-border);border-radius:18px;background:var(--stb-bg);color:var(--stb-text);box-shadow:0 14px 45px rgba(16,24,40,.07);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.stb-app *{box-sizing:border-box}.stb-hero{text-align:center;padding:20px 10px 32px}.stb-hero h2{font-size:clamp(30px,5vw,48px);margin:8px 0 12px}.stb-hero p{color:var(--stb-muted);font-size:18px}.stb-eyebrow{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--stb-primary)}.stb-tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.stb-tool-card{display:block;padding:22px;border:1px solid var(--stb-border);border-radius:16px;background:#fff;color:inherit;text-decoration:none;transition:.2s ease}.stb-tool-card:hover{transform:translateY(-3px);border-color:#93b4ff;box-shadow:0 10px 30px rgba(37,99,235,.1)}.stb-tool-card h3{margin:14px 0 8px;font-size:20px}.stb-tool-card p{margin:0 0 18px;color:var(--stb-muted);line-height:1.6}.stb-card-icon{display:inline-flex;align-items:center;justify-content:center;min-width:46px;height:46px;padding:0 10px;border-radius:12px;background:#eaf1ff;color:var(--stb-primary);font-weight:900}.stb-card-link{color:var(--stb-primary);font-weight:700}.stb-label{display:block;margin:18px 0 8px;font-weight:700}.stb-input,.stb-textarea{width:100%;border:1px solid #cfd6e1;border-radius:10px;padding:12px 14px;background:#fff;color:#172033;font:inherit;outline:none}.stb-input:focus,.stb-textarea:focus{border-color:#6c96f8;box-shadow:0 0 0 3px rgba(37,99,235,.12)}.stb-textarea{resize:vertical;line-height:1.6}.stb-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:18px 0}.stb-stats>div{padding:16px;border-radius:12px;background:var(--stb-soft);text-align:center}.stb-stats strong{display:block;font-size:25px}.stb-stats span{color:var(--stb-muted);font-size:13px}.stb-actions,.stb-output-row{display:flex;gap:10px;align-items:center;margin-top:16px}.stb-output-row .stb-input{flex:1}.stb-btn{border:0;border-radius:9px;padding:11px 17px;background:var(--stb-primary);color:#fff;font-weight:700;cursor:pointer}.stb-btn:hover{filter:brightness(.94)}.stb-secondary{background:#e9edf3;color:#25324a}.stb-meter{height:9px;margin:14px 0 8px;border-radius:99px;background:#e8edf4;overflow:hidden}.stb-meter-fill{display:block;width:0;height:100%;background:#f59e0b;transition:.2s}.stb-inline-status{display:flex;justify-content:space-between;color:var(--stb-muted)}.stb-preview{margin-top:22px;padding:20px;border:1px solid var(--stb-border);border-radius:12px;background:#fff}.stb-preview-url{color:#188038;font-size:14px}.stb-preview-title{color:#1a0dab;font-size:20px;line-height:1.3;margin-top:5px}.stb-preview-description{color:#4d5156;margin:6px 0 0}.stb-table-wrap{overflow:auto}.stb-table{width:100%;border-collapse:collapse}.stb-table th,.stb-table td{padding:11px;border-bottom:1px solid var(--stb-border);text-align:left}.stb-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.stb-score-wrap{display:flex;gap:20px;align-items:center;padding:20px;margin:20px 0;border-radius:14px;background:var(--stb-soft)}.stb-score{display:flex;align-items:baseline;justify-content:center;min-width:110px;height:110px;padding-top:24px;border:9px solid #d7dfeb;border-radius:50%}.stb-score strong{font-size:36px}.stb-recommendations{padding-left:22px}.stb-recommendations li{margin:9px 0}.stb-help{color:var(--stb-muted)}.stb-check-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:15px 0}.stb-range{width:100%}.stb-password-strength{font-weight:700}@media(max-width:800px){.stb-tool-grid{grid-template-columns:1fr 1fr}.stb-stats{grid-template-columns:1fr 1fr}.stb-app{padding:18px}}@media(max-width:540px){.stb-tool-grid,.stb-form-grid,.stb-stats,.stb-check-grid{grid-template-columns:1fr}.stb-actions,.stb-output-row,.stb-score-wrap{align-items:stretch;flex-direction:column}.stb-btn{width:100%}}