:root{--bg:#f6f8fc;--card:#fff;--txt:#172033;--muted:#667085;--primary:#5b6cff}html[data-theme=dark]{--bg:#0f172a;--card:#111c33;--txt:#e5e7eb;--muted:#a8b3cf;--primary:#8b9bff}body{background:var(--bg);color:var(--txt);transition:.25s}.glass,.card{background:var(--card)!important;color:var(--txt);border:1px solid rgba(128,128,128,.16)}.navbar .nav-link,.navbar-brand{color:var(--txt)!important}.hero{background:linear-gradient(135deg,rgba(91,108,255,.18),rgba(52,211,153,.16));border:1px solid rgba(128,128,128,.15)}.cipher-card{border-radius:22px;transition:.25s}.cipher-card:hover{transform:translateY(-5px);box-shadow:0 18px 35px rgba(0,0,0,.11)}.btn-primary{background:var(--primary);border-color:var(--primary)}.output-box{font-size:1.25rem;font-weight:700;letter-spacing:.06em;padding:1rem;border-radius:14px;background:rgba(91,108,255,.12);word-break:break-word}.matrix div{display:flex}.matrix span,.playfair-grid span{display:grid;place-items:center;width:44px;height:44px;margin:3px;border-radius:10px;background:rgba(91,108,255,.13);font-weight:700}.playfair-grid{display:grid;grid-template-columns:repeat(5,44px);gap:6px}.steps li{margin-bottom:.65rem;padding:.65rem;border-radius:12px;background:rgba(128,128,128,.09);animation:fade .35s ease both}.empty{background:rgba(128,128,128,.08)}.form-control,.form-select{background:transparent;color:var(--txt)}.form-control:focus,.form-select:focus{background:transparent;color:var(--txt)}@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}


.vigenere-wrap{max-width:100%;overflow:auto;border-radius:14px;border:1px solid rgba(128,128,128,.18);margin-top:.75rem}
.vigenere-table{border-collapse:collapse;min-width:900px;width:100%;font-size:.82rem;background:var(--card);color:var(--txt)}
.vigenere-table th,.vigenere-table td{border:1px solid rgba(128,128,128,.25);padding:.35rem;text-align:center;min-width:32px}
.vigenere-table thead th,.vigenere-table tbody th{position:sticky;background:rgba(91,108,255,.15);font-weight:700}
.vigenere-table thead th{top:0;z-index:2}
.vigenere-table tbody th{left:0;z-index:1}