*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0D1117;--surface: #161B22;--border: #21262D;--text: #E6EDF3;--slate: #8B949E;--accent: #D98E2B;--danger: #BF3B2B;--success: #2F7D4F;--purple: #6B5FC7;--radius: 8px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif}body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px;line-height:1.5;min-height:100vh}.full-center{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px}.error-msg{color:var(--danger);font-size:13px}.btn{padding:6px 14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:13px;cursor:pointer;transition:opacity .15s}.btn:hover{opacity:.8}.btn.primary{background:var(--accent);border-color:var(--accent);color:#000;font-weight:600}.btn:disabled{opacity:.4;cursor:not-allowed}.spinner{width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-screen{display:flex;align-items:center;justify-content:center;height:100vh}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:48px 40px;text-align:center;width:340px}.login-logo{font-size:32px;margin-bottom:16px;color:var(--accent)}.login-title{font-size:22px;font-weight:700;margin-bottom:4px}.login-sub{color:var(--slate);font-size:13px;margin-bottom:32px}.login-btn{width:100%;padding:10px;font-size:14px}.shell{display:flex;flex-direction:column;height:100vh}.shell-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid 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