:root {
            --primary-color: #4142e0;
            --secondary-color: #3fbbda;
            --accent-color: #80f2ff;
            --background-color: #0d0d1a;
            --card-background: #1a1a2e;
            --text-color: #e8e8f0;
            --text-muted: #8888a0;
            --border-color: #2a2a4a;
            --error-color: #ff4757;
            --font-mono: 'JetBrains Mono', monospace;
            --font-sans: 'Outfit', -apple-system, sans-serif;
        }

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

        html, body {
            height: 100%;
            overflow: hidden;
            overscroll-behavior: none;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--background-color);
            background-image:
                radial-gradient(ellipse at 20% 0%, rgba(65, 66, 224, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(63, 187, 218, 0.06) 0%, transparent 50%);
            color: var(--text-color);
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            position: fixed;
            inset: 0;
            touch-action: manipulation;
        }

        .login-container {
            width: 100%;
            max-width: 400px;
            transition: transform 0.3s ease;
        }

        .login-card {
            background-color: var(--card-background);
            padding: 40px 36px;
            border-radius: 16px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.03);
        }

        .logo-section {
            text-align: center;
            margin-bottom: 32px;
        }

        .logo-section img {
            width: 72px;
            margin-bottom: 16px;
            filter: drop-shadow(0 0 20px rgba(65, 66, 224, 0.3));
        }

        .logo-section h1 {
            font-family: var(--font-sans);
            font-weight: 700;
            font-size: 1.8em;
            color: var(--text-color);
            letter-spacing: -0.02em;
        }

        .navidrome-notice {
            background: linear-gradient(135deg, rgba(65, 66, 224, 0.12) 0%, rgba(63, 187, 218, 0.08) 100%);
            border: 1px solid rgba(65, 66, 224, 0.25);
            border-radius: 12px;
            padding: 14px 16px;
            margin-bottom: 28px;
            text-align: center;
        }

        .navidrome-notice .notice-title {
            font-weight: 600;
            font-size: 0.95em;
            color: var(--text-color);
            margin-bottom: 4px;
        }

        .navidrome-notice .notice-subtitle {
            font-size: 0.85em;
            color: var(--text-muted);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 0.9em;
            color: var(--text-muted);
        }

        .form-group input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            font-family: var(--font-sans);
            font-size: 1em;
            background-color: rgba(255, 255, 255, 0.04);
            color: var(--text-color);
            transition: all 0.2s ease;
        }

        .form-group input::placeholder {
            color: var(--text-muted);
            opacity: 0.5;
        }

        .form-group input:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(65, 66, 224, 0.15);
            background-color: rgba(255, 255, 255, 0.06);
        }

        .login-btn {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, var(--primary-color) 0%, #5253f0 100%);
            color: white;
            border: none;
            border-radius: 10px;
            font-family: var(--font-sans);
            font-size: 1em;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 4px 12px rgba(65, 66, 224, 0.25);
            margin-top: 8px;
        }

        .login-btn:hover {
            background: linear-gradient(135deg, #5253f0 0%, var(--secondary-color) 100%);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(65, 66, 224, 0.35);
        }

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

        .login-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .error-msg {
            font-size: 0.9em;
            margin-top: 16px;
            display: none;
            padding: 12px 16px;
            border-radius: 10px;
            line-height: 1.4;
            text-align: center;
        }

        .error-msg.error-invalid {
            color: var(--error-color);
            background-color: rgba(255, 71, 87, 0.1);
            border: 1px solid rgba(255, 71, 87, 0.25);
        }

        .error-msg.error-offline {
            color: #ffb400;
            background-color: rgba(255, 180, 0, 0.1);
            border: 1px solid rgba(255, 180, 0, 0.25);
        }

        @media (max-width: 480px) {
            body { padding: 16px; }
            .login-card { padding: 28px 20px; }
        }