/* Modern Login Page Styles */
:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-light: #F9FAFB;
    --border-color: #E5E7EB;
}

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

body.login-page {
    font-family: 'Inter', '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;
    position: relative;
    overflow: hidden;
}

/* Animated Background */
body.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: backgroundMove 20s linear infinite;
    z-index: 0;
}

@keyframes backgroundMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.login-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 450px;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 40px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.login-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 30px 30px;
}

.login-logo {
    position: relative;
    z-index: 1;
}

.logo-icon {
    width: 70px;
    height: 70px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.logo-icon i {
    font-size: 32px;
    color: white;
}

.login-title {
    color: white;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.login-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: 400;
}

.login-body {
    padding: 40px 30px;
}

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

.welcome-text h2 {
    color: var(--text-dark);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.welcome-text p {
    color: var(--text-light);
    font-size: 14px;
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    color: var(--text-dark);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 18px;
    z-index: 2;
}

.form-control {
    width: 100%;
    padding: 14px 16px 14px 48px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    color: var(--text-dark);
    background: white;
    transition: all 0.3s ease;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-control::placeholder {
    color: #9CA3AF;
}

.validation-error {
    color: var(--danger-color);
    font-size: 13px;
    margin-top: 6px;
    display: block;
}

.remember-forgot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.custom-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.custom-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.custom-checkbox label {
    color: var(--text-dark);
    font-size: 14px;
    cursor: pointer;
    user-select: none;
    margin: 0;
}

.forgot-link {
    color: var(--primary-color);
    font-size: 14px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.forgot-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.btn-login {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

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

.login-footer {
    text-align: center;
    padding: 20px 30px 30px;
    border-top: 1px solid var(--border-color);
}

.footer-text {
    color: var(--text-light);
    font-size: 13px;
}

.footer-text a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.footer-text a:hover {
    text-decoration: underline;
}

/* Alert Styles */
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-danger {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

.alert-danger i {
    font-size: 18px;
}

/* Responsive */
@media (max-width: 576px) {
    .login-container {
        max-width: 100%;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .login-body {
        padding: 30px 20px;
    }
    
    .login-title {
        font-size: 24px;
    }
    
    .welcome-text h2 {
        font-size: 20px;
    }
}

/* Loading Animation */
.btn-login.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-login.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
/* Đường kẻ phân cách HOẶC */
.social-auth-hr {
    position: relative;
    text-align: center;
    margin: 25px 0 20px;
}

.social-auth-hr:before {
    content: "";
    display: block;
    width: 100%;
    height: 1px;
    background: #e0e0e0;
    position: absolute;
    top: 50%;
    left: 0;
}

.social-auth-hr span {
    background: #fff;
    padding: 0 15px;
    position: relative;
    color: #888;
    font-size: 14px;
}

/* Nút Google */
.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 12px;
    background-color: #fff;
    border: 1px solid #dadce0;
    border-radius: 8px;
    color: #3c4043;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: background-color .3s, box-shadow .3s;
    text-decoration: none;
}

.btn-google:hover {
    background-color: #f8f9fa;
    box-shadow: 0 1px 3px 0 rgba(60,64,67,0.30), 0 4px 8px 3px rgba(60,64,67,0.15);
}

.google-icon {
    width: 20px;
    height: 20px;
    margin-right: 12px;
}