:root{--bg: #f4f7fb;--card: #ffffff;--text: #16212f;--muted: #6b7785;--primary: #0ea5e9;--primary-hover: #0284c7;--success: #22c55e;--success-hover: #16a34a;--danger: #ef4444;--border: #dce3eb;--shadow: 0 14px 40px rgba(5, 31, 61, .08)}.app,.app *{box-sizing:border-box}.app{max-width:980px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:20px}.dark .app{--card: #0f172a;--text: #e5e7eb;--muted: #94a3b8;--border: #334155;--shadow: none;background:var(--card);border-color:var(--border);color:var(--text)}.app h1{margin:0;font-size:26px}.desc{margin:8px 0 18px;color:var(--muted);font-size:14px;line-height:1.6}.dark .desc{color:#94a3b8}.settings{display:flex;flex-direction:column;gap:8px;align-items:stretch;margin-bottom:14px;padding:10px;border:1px dashed var(--border);border-radius:10px;background:#f8fbff}.dark .settings{background:#111827;border-color:#334155}.settings label{display:block;font-size:14px;color:#334155;font-weight:600}.dark .settings label{color:#cbd5e1}.codec-row{display:flex;align-items:center;gap:10px;flex-wrap:nowrap;width:100%}.settings input{width:auto;min-width:0;flex:1 1 auto;height:36px;border-radius:8px;border:1px solid var(--border);padding:0 10px;font-size:14px;outline:none}.dark .settings input{background:#0b1220;color:#e5e7eb;border-color:#334155}.settings input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0ea5e92e}.dark .settings input:focus{box-shadow:0 0 0 3px #38bdf840}.layout{display:grid;grid-template-columns:1fr auto 1fr;gap:12px}.block label{display:block;font-size:18px;margin-bottom:8px;font-weight:600;color:#334155}.dark .block label{color:#cbd5e1}.app textarea{width:100%;min-height:280px;resize:vertical;border-radius:10px;border:1px solid var(--border);background:#fbfdff;padding:12px;font-size:15px;line-height:1.6;outline:none}.dark .app textarea{background:#0b1220;color:#e5e7eb;border-color:#334155}.dark .app textarea::placeholder{color:#64748b}.app textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0ea5e92e}.dark .app textarea:focus{box-shadow:0 0 0 3px #38bdf840}.textarea-wrap{position:relative}.textarea-wrap textarea{padding-right:60px}.btn-copy-cipher{position:absolute;top:8px;right:8px;min-width:0;height:30px;padding:0 10px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;color:#334155;font-size:12px;font-weight:600;line-height:1;z-index:2;box-shadow:0 4px 10px #0f172a29;opacity:0;visibility:hidden;pointer-events:none;transition:background .18s ease,box-shadow .18s ease,border-color .18s ease,opacity .18s ease}.textarea-wrap.has-text .btn-copy-cipher{opacity:1;visibility:visible;pointer-events:auto}.btn-copy-cipher:hover{background:#f8fafc;border-color:#94a3b8;box-shadow:0 6px 14px #0f172a38}.dark .btn-copy-cipher{background:#111827;color:#e2e8f0;border-color:#334155;box-shadow:none}.dark .btn-copy-cipher:hover{background:#1f2937;border-color:#475569;box-shadow:none}.btn-clear-inline{top:44px;color:#b91c1c;border-color:#ef444466;background:#fffffff2}.dark .btn-clear-inline{color:#fca5a5;border-color:#f8717180;background:#111827}.btn-clear-inline:hover{background:#fff5f5;border-color:#ef44448c}.dark .btn-clear-inline:hover{background:#1f2937;border-color:#f87171b3}.actions{display:flex;flex-direction:column;justify-content:center;gap:10px}.btn-encode,.btn-decode,.actions .btn-clear,.settings .btn-clear{display:flex;align-items:center;justify-content:center;height:38px;min-width:126px;padding:0 14px;border:none;border-radius:8px;font-size:14px;font-weight:700;line-height:1;cursor:pointer;transition:background .18s ease,box-shadow .18s ease,border-color .18s ease}.btn-content{display:inline-flex;align-items:center;justify-content:center;gap:6px;line-height:1}.btn-icon{width:16px;height:16px;display:block;flex:0 0 auto}.btn-icon-key{width:18px;height:18px;transform:translateY(-.5px)}.btn-encode{background:var(--primary);color:#fff}.btn-encode:hover{background:var(--primary-hover)}.btn-decode{background:var(--success);color:#fff}.btn-decode:hover{background:var(--success-hover)}.actions .btn-clear,.settings .btn-clear{background:#fff;color:var(--danger);border:1px solid rgba(239,68,68,.35)}.dark .actions .btn-clear,.dark .settings .btn-clear{background:transparent;color:#fca5a5;border-color:#f8717180}.actions .btn-clear:hover,.settings .btn-clear:hover{background:#fff5f5}.dark .actions .btn-clear:hover,.dark .settings .btn-clear:hover{background:#7f1d1d47}.toast-wrap{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:9999;display:flex;flex-direction:column;align-items:center;gap:10px;pointer-events:none}.toast{width:max-content;max-width:min(92vw,420px);padding:20px 30px;border-radius:10px;background:#000c;color:#fff;font-size:14px;line-height:1.5;box-shadow:0 8px 22px #02061733;display:flex;align-items:center;gap:8px;transform:translateY(-8px);opacity:0;animation:toast-in .2s ease forwards}.toast-icon{width:16px;height:16px;flex:0 0 auto}.toast-icon.success{color:#22c55e}.toast-icon.error{color:#ef4444}.toast-text{color:#fff}.toast.hide{animation:toast-out .2s ease forwards}@keyframes toast-in{to{transform:translateY(0);opacity:1}}@keyframes toast-out{to{transform:translateY(-8px);opacity:0}}@media(max-width:900px){.layout{grid-template-columns:1fr}.actions{flex-direction:row;justify-content:flex-start;flex-wrap:wrap}.btn-encode,.btn-decode,.actions .btn-clear,.settings .btn-clear{min-width:0;padding:0 12px}.app textarea{min-height:180px}}