* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background: linear-gradient(135deg, #ffffff, #ffffff, #b8dbff);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.login-container {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #1a2a6c, #1f1fb2, #67b9f7);
}

.logo {
    text-align: center;
    margin-bottom: 25px;
}

.logo h1 {
    color: #1a2a6c;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 5px;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.input-field {
    width: 100%;
    padding: 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s;
}

.input-field:focus {
    border-color: #1a2a6c;
    box-shadow: 0 0 0 3px rgba(26, 42, 108, 0.2);
    outline: none;
}

.btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(90deg, #1a2a6c, #b21f1f);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 10px;
}

.btn:hover {
    background: linear-gradient(90deg, #0e1a4d, #8a1717);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.footer {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.success-message {
    color: #27ae60;
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
    vertical-align: middle;
}

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