:root{--bg-primary: #0f1419;--bg-secondary: #1d232a;--bg-tertiary: #2a3038;--text-primary: #e4e6eb;--text-secondary: #8899a6;--accent: deepskyblue;--accent-hover: #00bfff;--success: lawngreen;--danger: #ff4444;--border: 1px solid #2a3038;--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh}input,textarea,button{font-family:inherit;font-size:inherit}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:1rem}.login-card{background:var(--bg-secondary);border:var(--border);border-radius:var(--radius);padding:2.5rem;width:100%;max-width:400px;text-align:center}.login-card h1{font-size:2rem;color:var(--accent);margin-bottom:.25rem}.subtitle{color:var(--text-secondary);margin-bottom:1.5rem}.login-card form{display:flex;flex-direction:column;gap:.75rem}.login-card 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textarea{background:var(--bg-tertiary);border:var(--border);border-radius:var(--radius);padding:.65rem .75rem;color:var(--text-primary);outline:none;resize:vertical}.modal-form input:focus,.modal-form textarea:focus{border-color:var(--accent)}.modal-actions{display:flex;gap:.5rem;justify-content:flex-end;margin-top:.5rem}.modal-actions button{background:var(--bg-tertiary);border:1px solid var(--accent);color:var(--accent);border-radius:var(--radius);padding:.5rem 1rem;cursor:pointer}.modal-actions button:hover{background:var(--accent);color:var(--bg-primary)}.confirm-dialog{max-width:350px;text-align:center}.confirm-dialog p{margin-bottom:1rem}.msg-reader .decrypt-section{margin:.5rem 0}.msg-content{background:var(--bg-tertiary);border-radius:var(--radius);padding:1rem;min-height:80px;word-break:break-word;white-space:pre-wrap}.chat-join{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1.5rem}.chat-join 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1.5rem;flex-wrap:wrap;border-bottom:var(--border)}.user-tag{background:var(--bg-tertiary);border-radius:12px;padding:.2rem .6rem;font-size:.75rem;color:var(--text-secondary)}.user-tag.me{color:var(--accent);border:1px solid var(--accent)}.messages-container{flex:1;overflow-y:auto;padding:1rem 1.5rem;display:flex;flex-direction:column;gap:.5rem}.system-msg{text-align:center;color:var(--text-secondary);font-size:.8rem;padding:.25rem}.msg-bubble{max-width:70%;padding:.6rem 1rem;border-radius:12px;word-break:break-word}.msg-bubble.sent{align-self:flex-end;background:var(--accent);color:var(--bg-primary)}.msg-bubble.received{align-self:flex-start;background:#03bb03;color:#fff}.msg-from{font-size:.7rem;font-weight:600;opacity:.8}.msg-bubble p{margin:.2rem 0}.msg-time{font-size:.65rem;opacity:.7}.typing-indicator{padding:.25rem 1.5rem;color:var(--text-secondary);font-size:.8rem;font-style:italic}.chat-input{display:flex;gap:.5rem;padding:1rem 1.5rem;border-top:var(--border);background:var(--bg-secondary)}.chat-input input{flex:1;background:var(--bg-tertiary);border:var(--border);border-radius:20px;padding:.65rem 1rem;color:var(--text-primary);outline:none}.chat-input input:focus{border-color:var(--accent)}.chat-input button{background:var(--accent);color:var(--bg-primary);border:none;border-radius:20px;padding:.65rem 1.25rem;cursor:pointer;font-weight:600}.settings-section{background:var(--bg-secondary);border:var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:1rem}.settings-section h3{color:var(--accent);margin-bottom:.75rem;font-size:.95rem}.setting-row{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0}.setting-row label{color:var(--text-secondary)}.status-msg{color:var(--success);font-size:.85rem;margin-top:.5rem}.settings-section button.full-width{border:none;border-radius:var(--radius);padding:.75rem;cursor:pointer;font-weight:600}@media(max-width:768px){.app-layout{flex-direction:column}.sidebar{width:100%;border-right:none;border-bottom:var(--border)}.sidebar-header{display:flex;align-items:center;gap:1rem;padding:.75rem 1rem}.sidebar-header h1{font-size:1rem}.nav-links{flex-direction:row;overflow-x:auto;padding:.25rem .5rem}.nav-links a{padding:.5rem .75rem;font-size:.85rem;white-space:nowrap}.main-content{max-height:none}.msg-bubble{max-width:85%}}