.app,.app *{box-sizing:border-box}.app{max-width:100%;margin:0 auto;background:var(--app-surface);border:1px solid var(--app-border);border-radius:24px;box-shadow:var(--app-shadow);padding:18px;color:var(--app-text)}.settings{display:flex;flex-direction:column;gap:8px;margin-bottom:14px;padding:12px;border:1px solid var(--app-border);border-radius:14px;background:var(--app-surface-soft)}.settings label{font-size:14px;color:var(--app-text-muted);font-weight:600}.codec-row{display:flex;align-items:center;gap:10px}.settings input{width:100%;min-width:0;flex:1;height:36px;border-radius:10px;border:1px solid var(--app-border);background:var(--app-surface);padding:0 10px;font-size:14px;outline:none;color:var(--app-text)}.settings input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #1f8fe529}.layout{display:grid;grid-template-columns:1fr auto 1fr;gap:14px}.block label{display:block;font-size:15px;margin-bottom:8px;font-weight:600;color:var(--app-text)}.app textarea{width:100%;min-height:240px;resize:vertical;border-radius:12px;border:1px solid var(--app-border);background:var(--app-surface-soft);padding:12px;font-size:15px;line-height:1.6;outline:none;color:var(--app-text)}.app textarea:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #1f8fe529}.dark .app textarea::placeholder{color:#64748b}.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 var(--app-border);border-radius:8px;background:var(--app-surface);color:var(--app-text-muted);font-size:12px;font-weight:600;line-height:1;z-index:2;box-shadow:0 1px 2px #0f172a14;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:var(--app-surface-soft);color:var(--app-text);border-color:#cbd5e1}.dark .btn-copy-cipher:hover{border-color:#475569}.btn-clear-inline{top:44px;color:#b91c1c;border-color:#ef44444d}.btn-clear-inline:hover{background:#fff5f5;border-color:#ef444480}.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:40px;min-width:132px;padding:0 14px;border:1px solid transparent;border-radius:12px;font-size:14px;font-weight:700;line-height:1;cursor:pointer;transition:background .18s ease,box-shadow .18s ease,border-color .18s ease,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(--color-primary);border-color:var(--color-primary-dark);color:#fff}.btn-encode:hover{filter:brightness(.97)}.btn-decode{background:var(--app-surface);border-width:2px;border-color:var(--app-border);color:var(--app-text)}.btn-decode:hover{background:var(--app-surface-soft);border-color:#cbd5e1}.actions .btn-clear{background:var(--app-surface);color:#dc2626;border-width:2px;border-color:#ef444459}.actions .btn-clear:hover{background:#fff5f5}.settings .btn-clear{background:var(--app-surface);color:var(--color-primary-dark);border-width:2px;border-color:#1f8fe566}.settings .btn-clear:hover{background:#eff6ff;border-color:#1f8fe599}.dark .actions .btn-clear{color:#fca5a5;border-color:#f8717180}.dark .actions .btn-clear:hover{background:#7f1d1d47}.dark .settings .btn-clear{color:#93c5fd;border-color:#60a5fa8c}.dark .settings .btn-clear:hover{background:#1e3a8a47}.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:10px 30px;border-radius:10px;background:#fff;color:#111827;border:1px solid var(--app-border);font-size:14px;line-height:1.5;box-shadow:0 10px 24px #0206171f;display:flex;align-items:center;gap:8px;transform:translateY(-8px);opacity:0;animation:toast-in .2s ease forwards}.toast-icon{width:36px;height:36px;padding:8px;border-radius:9999px;color:#fff;flex:0 0 auto}.toast-icon.success{background:#4a8660}.toast-icon.error{background:#c56a6a}.toast-text{color:#111827;font-weight:600}.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}}