@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.1/font/bootstrap-icons.css');

:root {
    --primary-color: #2563eb;
    --accent-color: #06b6d4;
    --bg-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.85); /* 提高不透明度，手机端更易读 */
    --text-main: #1e293b;
    --glass-border: 1px solid rgba(255, 255, 255, 0.6);
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    position: relative;
    overflow-x: hidden; /* 防止水平滚动条 */
    padding-bottom: 80px; /* 底部留白，防止被手机手势条遮挡 */
}

/* --- 动态背景 --- */
body::before, body::after {
    content: '';
    position: absolute;
    width: 60vw; /* 改用视口单位 */
    height: 60vw;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.4;
    animation: floatBlob 10s infinite alternate;
}

body::before {
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    top: -10vw;
    left: -10vw;
}

body::after {
    background: linear-gradient(to right, #2dd4bf, #38bdf8);
    bottom: -10vw;
    right: -10vw;
}

@keyframes floatBlob {
    0% { transform: translate(0, 0); }
    100% { transform: translate(20px, 20px); }
}

/* --- 导航栏 --- */
.navbar {
    background: rgba(255, 255, 255, 0.95) !important; /* 手机端导航栏更不透明 */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 0.8rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color) !important;
}

/* --- 卡片通用样式 --- */
.cyber-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 1.8rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    height: 100%; /* 确保同排卡片等高 */
}

.cyber-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.1);
    background: #fff;
    border-color: var(--primary-color);
}

/* --- 按钮美化 --- */
.btn-cyber {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border: none;
    color: white !important;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: 50px;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    transition: 0.2s;
}

.btn-cyber:active {
    transform: scale(0.98);
}

/* --- PC端默认容器间距 --- */
.main-container {
    margin-top: 120px;
    padding-bottom: 60px;
}

/* --- 表格优化 --- */
.table th {
    font-weight: 600;
    color: #64748b;
    border-bottom-width: 1px;
}

/* =========================================
   📱 移动端专项适配 (核心部分)
   ========================================= */
@media (max-width: 768px) {
    /* 1. 调整顶部间距 (手机上不需要太宽) */
    .main-container {
        margin-top: 90px;
        padding-left: 15px;
        padding-right: 15px;
        padding-bottom: 40px;
    }

    /* 2. 标题文字变小 */
    h1.display-5 {
        font-size: 1.8rem; /* 首页大标题缩小 */
        font-weight: 800;
    }

    h2 { font-size: 1.5rem; }
    h4 { font-size: 1.1rem; }

    /* 3. 卡片紧凑化 */
    .cyber-card {
        padding: 1.25rem; /* 减小内边距 */
        border-radius: 16px;
    }

    /* 4. 手机端卡片间距 */
    .row.g-4 {
        --bs-gutter-y: 1rem; /* 减小上下卡片间距 */
    }

    /* 5. 导航栏调整 */
    .navbar-toggler {
        border: none;
        padding: 0;
    }
    .navbar-toggler:focus {
        box-shadow: none;
    }

    /* 下拉菜单在手机上居中并美化 */
    .navbar-collapse {
        background: #fff;
        margin-top: 10px;
        padding: 15px;
        border-radius: 12px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        border: 1px solid #eee;
    }

    .nav-btn-group {
        flex-direction: column;
        width: 100%;
        gap: 10px !important;
    }

    .nav-btn-group .btn,
    .nav-btn-group .dropdown {
        width: 100%;
        text-align: center;
    }

    .dropdown-menu {
        border: none;
        background: #f8f9fa;
        text-align: center;
    }

    /* 6. 模态框 (弹窗) 适配 */
    .modal-dialog {
        margin: 10px; /* 左右留一点缝隙 */
    }

    /* 7. 隐藏不必要的装饰，提升性能 */
    body::before, body::after {
        opacity: 0.2; /* 减淡背景 */
        filter: blur(60px);
    }
}