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

body {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    /* 还原视觉图中的高级冷灰渐变背景 */
    background: linear-gradient(135deg, #eef2f9 0%, #d4dfea 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: 20px;
}

.login-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 40px 30px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    margin-bottom: 25px;
}

.login-header {
    text-align: center;
    margin-bottom: 35px;
}
.login-header h2 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 8px;
    letter-spacing: 2px;
}
.login-header p {
    font-size: 0.95rem;
    color: #5c6b77;
    letter-spacing: 1px;
}

.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.9rem;
    color: #333;
    margin-bottom: 8px;
}
.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #dcdfe6;
    border-radius: 6px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

#loginBtn {
    width: 100%;
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.2s, transform 0.1s;
}
#loginBtn:hover {
    background-color: #2980b9;
}
#loginBtn:active {
    transform: scale(0.98);
}
#loginBtn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
    transform: none;
}

.login-msg {
    margin-top: 15px;
    font-size: 0.85rem;
    text-align: center;
    min-height: 20px;
}

.login-footer {
    text-align: center;
    color: #7f8c8d;
    font-size: 0.85rem;
    line-height: 1.8;
}