:root {
            --bg-base: #030712;
            --surface: rgba(17, 24, 39, 0.75);
            --border: rgba(31, 41, 55, 0.8);
            --border-glow: rgba(59, 130, 246, 0.5);
            
            --primary: #3b82f6;
            --primary-glow: rgba(59, 130, 246, 0.35);
            --cyan: #06b6d4;
            --emerald: #10b981;
            --danger: #ef4444;
            
            --text-main: #f9fafb;
            --text-muted: #9ca3af;
            --font-main: 'Plus Jakarta Sans', sans-serif;
            --font-mono: 'JetBrains Mono', monospace;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-base);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            position: relative;
        }

        /* ===== Network Node Animation Canvas ===== */
        #network-canvas {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            pointer-events: none;
        }

        /* Ambient Glow Highlights */
        .ambient-light {
            position: absolute;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, var(--primary-glow) 0%, rgba(0,0,0,0) 70%);
            z-index: 2;
            top: 20%;
            left: 50%;
            transform: translate(-50%, -50%);
            filter: blur(80px);
            pointer-events: none;
        }

        /* ===== Main Container ===== */
        .login-wrapper {
            position: relative;
            z-index: 10;
            width: 100%;
            max-width: 440px;
            padding: 24px;
        }

        .login-card {
            background: var(--surface);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 36px 32px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7),
                        0 0 30px rgba(59, 130, 246, 0.1);
            transition: border-color 0.3s ease;
        }

        .login-card:hover {
            border-color: var(--border-glow);
        }

        /* ===== Network Branding Header ===== */
        .brand-header {
            text-align: center;
            margin-bottom: 28px;
        }

        .terminal-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(15, 23, 42, 0.8);
            border: 1px solid var(--border);
            padding: 6px 14px;
            border-radius: 30px;
            font-family: var(--font-mono);
            font-size: 11px;
            color: var(--cyan);
            margin-bottom: 16px;
        }

        .status-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--emerald);
            box-shadow: 0 0 8px var(--emerald);
            animation: pulse-ping 1.5s infinite;
        }

        @keyframes pulse-ping {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.2); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        .brand-title {
            font-size: 24px;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--text-main);
            margin-bottom: 6px;
        }

        .brand-subtitle {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ===== Input Fields ===== */
        .form-group {
            margin-bottom: 20px;
            position: relative;
        }

        .field-label {
            display: block;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-muted);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .input-control {
            position: relative;
            display: flex;
            align-items: center;
        }

        .input-control i.field-icon {
            position: absolute;
            left: 14px;
            color: var(--text-muted);
            font-size: 14px;
            transition: color 0.2s ease;
        }

        .input-control input {
            width: 100%;
            background: rgba(3, 7, 18, 0.6);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 12px 14px 12px 42px;
            font-size: 14px;
            color: var(--text-main);
            font-family: var(--font-main);
            outline: none;
            transition: all 0.2s ease;
        }

        .input-control input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px var(--primary-glow);
            background: rgba(3, 7, 18, 0.85);
        }

        .input-control input:focus + i.field-icon {
            color: var(--primary);
        }

        .toggle-password {
            position: absolute;
            right: 14px;
            background: none;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            font-size: 14px;
        }

        .toggle-password:hover { color: var(--text-main); }

        /* Error States */
        .error-field input { border-color: var(--danger); }
        .error-msg {
            color: var(--danger);
            font-size: 12px;
            margin-top: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ===== Submit Button ===== */
        .btn-submit {
            width: 100%;
            background: linear-gradient(135deg, var(--primary) 0%, #2563eb 100%);
            border: none;
            border-radius: 10px;
            padding: 14px;
            color: #ffffff;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            box-shadow: 0 4px 14px var(--primary-glow);
            transition: all 0.2s ease;
            margin-top: 10px;
        }

        .btn-submit:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 20px var(--primary-glow);
            filter: brightness(1.08);
        }

        .btn-submit:active { transform: translateY(0); }

        /* ===== Footer Diagnostic Telemetry ===== */
        .system-status {
            margin-top: 24px;
            padding-top: 18px;
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-family: var(--font-mono);
            font-size: 11px;
            color: var(--text-muted);
        }

        .latency-indicator {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .ping-time { color: var(--emerald); }