:root {
    --primary-color: #007bff; /* 网站主色调 */
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --dark-text: #343a40;
    --border-color: #ced4da;
}

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--light-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--dark-text);
    line-height: 1.6;
}
.form-container {
    background-color: #fff;
    padding: 30px; /* 减少内边距 */
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 400px;
    text-align: center;
    box-sizing: border-box; 
}

/* 新的 Header 样式 - 紧凑版 */
.form-header {
    text-align: center;
    margin-bottom: 20px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 5px;
}

.logo-container img {
    width: 32px; /* 缩小 Logo */
    height: 32px;
    object-fit: contain;
    margin-right: 8px;
}

.logo-container h1 {
    font-size: 16px; /* 缩小系统名称 */
    font-weight: 600;
    color: #666; /* 颜色变浅，不再抢眼 */
    margin: 0;
    line-height: 1.2;
}

.platform-title {
    font-size: 24px; /* 突出当前页面功能 */
    color: var(--primary-color);
    margin: 5px 0 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.slogan-container {
    margin-bottom: 15px;
}

.main-slogan {
    font-size: 12px;
    color: #999;
    font-weight: normal;
    margin: 0;
}

.sub-slogan {
    display: none; /* 隐藏副标语以节省空间 */
}

/* 原有的 Form 样式保留 */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark-text);
    font-weight: 500;
    font-size: 14px;
}
.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}
.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
    outline: none;
}
.form-group input[type="submit"],
.form-button {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    margin-top: 10px;
}
.form-group input[type="submit"]:hover,
.form-button:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
}
.form-group input[type="submit"]:active,
.form-button:active {
    transform: translateY(0);
}
.message {
    margin-top: 25px;
    padding: 15px;
    border-radius: 5px;
    display: none; 
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
}
.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

@media (max-width: 480px) {
    .form-container {
        padding: 25px;
        border-radius: 8px;
    }
    .logo-container h1 {
        font-size: 20px;
    }
    .main-slogan {
        font-size: 18px;
    }
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 14px;
}
.form-options .remember-me {
    display: flex;
    align-items: center;
}
.form-options .remember-me input {
    margin-right: 5px;
}
.form-options a {
    color: var(--primary-color);
    text-decoration: none;
}
.form-options a:hover {
    text-decoration: underline;
}
.register-link {
    margin-top: 20px;
    font-size: 14px;
}
.register-link a {
    color: var(--primary-color);
    text-decoration: none;
}
.register-link a:hover {
    text-decoration: underline;
}
.tech-support {
    background-color: #f0f7ff; /* 浅蓝背景，突出显示 */
    color: #0056b3; /* 深蓝文字 */
    padding: 12px 20px;
    border-radius: 8px;
    border: 1px solid #cce5ff;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 30px;
    white-space: nowrap;
}
.tech-support img {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    opacity: 1;
    flex-shrink: 0;
    /* 调整图标颜色为深蓝 */
    filter: invert(21%) sepia(95%) saturate(2335%) hue-rotate(202deg) brightness(93%) contrast(103%);
}
.tech-support-text {
    white-space: nowrap;
    flex-shrink: 0;
}