:root {
            --bg-color: #0b0b0c;
            --text-main: #ffffff;
            --text-muted: rgba(255, 255, 255, 0.5);
            --error-color: #ef4444;
        }

        body {
            margin: 0;
            padding: 0;
            background: #0b0b0c;
            font-family: 'Inter', -apple-system, sans-serif;
            color: var(--text-main);
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow-x: hidden;
            overflow-y: auto;
        }

        .container {
            width: 100%;
            max-width: 440px;
            padding: 24px;
            box-sizing: border-box;
            position: relative;
            z-index: 1;
        }

        .glass-card {
            background: rgba(18, 18, 20, 0.65);
            backdrop-filter: blur(30px);
            -webkit-backdrop-filter: blur(30px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            padding: 48px 36px;
            text-align: center;
            box-shadow:
                0 30px 60px rgba(0, 0, 0, 0.6),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
            animation: floatIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
        }

        @keyframes floatIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        h1 {
            margin: 0 0 8px 0;
            font-size: 1.6rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: #ffffff;
        }

        p.subtitle {
            color: var(--text-muted);
            margin: 0 0 32px 0;
            font-size: 0.88rem;
            line-height: 1.5;
        }

        .input-group {
            margin-bottom: 20px;
            text-align: left;
            position: relative;
        }

        .input-group label {
            display: block;
            font-size: 0.76rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: rgba(255, 255, 255, 0.45);
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        .input-group input {
            width: 100%;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            color: white;
            padding: 14px 16px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            box-sizing: border-box;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            outline: none;
        }

        .input-group input:focus {
            border-color: rgba(255, 255, 255, 0.35);
            background: rgba(255, 255, 255, 0.06);
            box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.05);
        }

        /* Customize placeholder */
        .input-group input::placeholder {
            color: rgba(255, 255, 255, 0.25);
        }

        .btn-submit {
            width: 100%;
            background: rgba(255, 255, 255, 0.88);
            color: #0b0b0c;
            border: none;
            padding: 16px;
            font-size: 0.92rem;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            margin-top: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-submit:hover {
            background: #ffffff;
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.18);
            transform: translateY(-1px);
        }

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

        .btn-submit:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
            background: rgba(255, 255, 255, 0.88);
        }

        .error-message {
            color: var(--error-color);
            background: rgba(239, 68, 68, 0.08);
            border: 1px solid rgba(239, 68, 68, 0.15);
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 0.88rem;
            margin-bottom: 24px;
            display: none;
            animation: shake 0.4s ease-in-out;
            text-align: left;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-6px); }
            75% { transform: translateX(6px); }
        }

        .spinner {
            width: 18px;
            height: 18px;
            border: 2px solid rgba(0,0,0,0.1);
            border-top-color: #000000;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
            display: none;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .alert-prefilled {
            color: var(--error-color);
            background: rgba(239, 68, 68, 0.08);
            border: 1px solid rgba(239, 68, 68, 0.15);
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 0.88rem;
            margin-bottom: 24px;
            text-align: left;
        }

        /* ===== HIMMEL ORBIT SPINNER (Apple Style Glassmorphic Overlay) ===== */
        #himmel-loader-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 11, 12, 0.6);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 99999;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        #himmel-loader-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }

        .himmel-spinner-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
            padding: 28px 36px;
            background: rgba(9, 9, 11, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 20px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(25px);
            -webkit-backdrop-filter: blur(25px);
            max-width: 90%;
            text-align: center;
        }

        .himmel-orbit-spinner {
            position: relative;
            width: 55px;
            height: 55px;
        }
        .himmel-orbit-spinner .circle {
            position: absolute;
            box-sizing: border-box;
            width: 100%;
            height: 100%;
            border-radius: 50%;
        }
        .himmel-orbit-spinner .circle.one {
            left: 0%;
            top: 0%;
            animation: orbit-rotate-one 1.2s linear infinite;
            border-bottom: 2.5px solid rgba(255, 255, 255, 0.9);
            box-shadow: 0 4px 12px rgba(255, 255, 255, 0.25);
        }
        .himmel-orbit-spinner .circle.two {
            right: 0%;
            top: 0%;
            animation: orbit-rotate-two 1.2s linear infinite;
            border-right: 2.5px solid rgba(255, 255, 255, 0.5);
            box-shadow: 4px 0 10px rgba(255, 255, 255, 0.15);
        }
        .himmel-orbit-spinner .circle.three {
            right: 0%;
            bottom: 0%;
            animation: orbit-rotate-three 1.2s linear infinite;
            border-top: 2.5px solid rgba(255, 255, 255, 0.2);
            box-shadow: 0 -4px 10px rgba(255, 255, 255, 0.08);
        }

        .himmel-loader-text {
            font-size: 0.72rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 600;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            margin-top: 8px;
            animation: himmel-text-pulse 1.8s ease-in-out infinite;
        }

        @keyframes orbit-rotate-one {
            0% { transform: rotateX(35deg) rotateY(-45deg) rotateZ(0deg); }
            100% { transform: rotateX(35deg) rotateY(-45deg) rotateZ(360deg); }
        }
        @keyframes orbit-rotate-two {
            0% { transform: rotateX(50deg) rotateY(10deg) rotateZ(0deg); }
            100% { transform: rotateX(50deg) rotateY(10deg) rotateZ(360deg); }
        }
        @keyframes orbit-rotate-three {
            0% { transform: rotateX(35deg) rotateY(55deg) rotateZ(0deg); }
            100% { transform: rotateX(35deg) rotateY(55deg) rotateZ(360deg); }
        }
        @keyframes himmel-text-pulse {
            0%, 100% { opacity: 0.45; }
            50% { opacity: 1; text-shadow: 0 0 10px rgba(255, 255, 255, 0.35); }
        }

@media (max-width: 480px), (max-height: 650px) {
    .container { padding: 20px; }
    .glass-card { padding: 28px 24px; }
    input { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
    .glass-card { animation: none; }
}