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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 10px;
}

.login-header p {
    color: #666;
    font-size: 14px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

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

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

.error-message {
    background: #fee;
    color: #c33;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #fcc;
    display: none;
}

.success-message {
    background: #efe;
    color: #363;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #cfc;
    display: none;
}

.loading {
    display: none;
    text-align: center;
    margin-top: 10px;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.demo-info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
}

.demo-info h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 14px;
}

.demo-info p {
    color: #666;
    font-size: 12px;
    margin-bottom: 5px;
}

/* Waiting Dialog Overlay */
.waiting-dialog {
    position: fixed;
    z-index: 9999;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.waiting-backdrop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.35);
    z-index: 1;
}

.waiting-content {
    position: relative;
    z-index: 2;
    background: #fff;
    padding: 24px 24px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 300px;
    max-width: 90vw;
    min-width: unset;
    justify-content: center;
    top: calc(50% - 30px);
    left: calc(50% - 150px);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 5px solid #e3e3e3;
    border-top: 5px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 18px;
}

.waiting-text {
    font-size: 16px;
    color: #333;
    font-weight: 500;
    text-align: center;
}

/* Mobile Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .login-container {
        padding: 30px 20px;
    }

    .login-header h1 {
        font-size: 24px;
    }

    .form-group input {
        font-size: 14px;
        padding: 10px 14px;
    }

    .login-btn {
        padding: 12px;
        font-size: 14px;
    }
}