*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-dark: #eef2f7;--bg-panel: #ffffff;--bg-card: #f5f8fb;--nav-default: #4b6178;--nav-selected-bg: #0b3d6e;--nav-selected-fg: #ffffff;--accent: #005293;--accent-hover: #0a6cb8;--text-primary: #1f2937;--text-muted: #6b7280;--border: #d7e0ea;--danger: #c0392b;--success: #1e7a46;--warning: #b7791f;--row-hover: rgba(0,82,147,.06);--row-alt: rgba(11,61,110,.03);--font: "Segoe UI", "Malgun Gothic", sans-serif}html,body{height:100%}body{font-family:var(--font);background:var(--bg-dark);color:var(--text-primary);font-size:16px;overflow:hidden}#root{height:100%;display:flex;flex-direction:column}.splash{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;background:var(--bg-dark)}.splash-logo{font-size:24px;font-weight:700;color:var(--accent);letter-spacing:2px}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-page{height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,#e8f1fa,#f7fafc,#eef2f7)}.login-card{background:var(--bg-panel);border:1px solid var(--border);border-radius:12px;padding:48px 40px;width:360px;display:flex;flex-direction:column;gap:16px;align-items:center;box-shadow:0 10px 30px #0f375f1f}.login-logo{font-size:35px;font-weight:800;color:var(--accent);letter-spacing:4px}.login-card h1{font-size:18px;color:var(--text-primary)}.login-card p{font-size:13px;color:var(--text-muted);text-align:center}.btn-login{width:100%;padding:12px;border:none;border-radius:6px;background:var(--accent);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s}.btn-login:hover:not(:disabled){background:var(--accent-hover)}.btn-login:disabled{opacity:.6;cursor:not-allowed}.alert-error{width:100%;padding:10px 14px;border-radius:6px;background:#fdecea;border:1px solid var(--danger);color:var(--danger);font-size:12px;line-height:1.4}.alert-info{padding:8px 12px;border-radius:6px;background:#e8f1fa;border:1px solid var(--accent);color:var(--accent);font-size:12px}.main-layout{display:flex;flex:1;min-height:0;overflow:hidden}.sidebar{width:200px;min-width:200px;background:var(--bg-panel);border-right:1px solid var(--border);display:flex;flex-direction:column;transition:width .2s}.sidebar.collapsed{width:52px;min-width:52px}.sidebar-header{padding:16px 12px;border-bottom:1px solid 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24px;color:var(--text-primary);display:flex;flex-direction:column;align-items:center;gap:12px}.modal-drawing-hint{font-size:12px;color:var(--text-muted)}