/* css/login.css */

body {
    /* 俐落乾淨的白底/淺灰背景 */
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 20px;
    color: #334155;
}

.login-card {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 400px;
    padding: 40px 35px;
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #0d6efd, #00B4DB, #00d2ff);
}

.login-header {
    text-align: center;
    margin-bottom: 35px;
}

.login-header i.main-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #00B4DB 0%, #0d6efd 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 6px rgba(13, 110, 253, 0.2));
}

.login-header h3 {
    font-weight: 800;
    margin: 0;
    letter-spacing: 1.5px;
    font-size: 1.6rem;
    color: #1e293b;
}

.login-header p {
    margin-top: 8px;
    margin-bottom: 0;
    color: #64748b;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

.form-control {
    border-radius: 12px;
    padding: 12px 15px;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    color: #334155;
    transition: all 0.3s ease;
}

.form-control:focus {
    background: #ffffff;
    border-color: #0d6efd;
    box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.15);
    color: #334155;
}

.form-control::placeholder {
    color: #94a3b8;
}

.input-group-text {
    border-radius: 12px 0 0 12px;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-right: none;
    color: #64748b;
    padding-left: 18px;
}

.form-control.with-icon {
    border-radius: 0 12px 12px 0;
    border-left: none;
}

.form-label {
    color: #475569 !important;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.btn-login {
    background: linear-gradient(135deg, #0d6efd 0%, #00509e 100%);
    border: none;
    border-radius: 12px;
    padding: 12px;
    font-weight: bold;
    font-size: 1.1rem;
    margin-top: 20px;
    letter-spacing: 1px;
    box-shadow: 0 8px 20px rgba(13, 110, 253, 0.2);
    transition: all 0.3s ease;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(13, 110, 253, 0.4);
    background: linear-gradient(135deg, #1e7bff 0%, #0062cc 100%);
}

.alert-danger {
    background: #fef2f2;
    border: 1px solid #fecdd3;
    color: #ef4444;
}