/* /homenav/public/assets/css/style.css (Final 2-Column Mobile Fix) */
:root {
    --primary-color: #007bff;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #343a40;
    --light-text-color: #6c757d;
    --border-color: #e9ecef;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 12px;
    --transition-speed: 0.3s;
}
[data-theme="dark"] {
    --primary-color: #389dff;
    --background-color: #1a202c;
    --card-background: #2d3748;
    --text-color: #e2e8f0;
    --light-text-color: #a0aec0;
    --border-color: #4a5568;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    padding-top: 80px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}
.container { max-width: 1400px; margin: 0 auto; padding: 0 24px; }

/* --- 顶栏 --- */
.main-header {
    background-color: var(--card-background);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    height: 80px;
    top: 0;
    left: 0;
    z-index: 1000;
    transition: all var(--transition-speed);
}
.main-header .container { display: flex; justify-content: space-between; align-items: center; height: 100%; gap: 20px; }
.logo-link { text-decoration: none; display: flex; align-items: center; flex-shrink: 0; }
.logo-image { height: 45px; width: auto; max-width: 180px; object-fit: contain; }
.header-actions { display: flex; align-items: center; flex-shrink: 0; }
#theme-toggle { background: none; border: none; width: 40px; height: 40px; cursor: pointer; display: flex; justify-content: center; align-items: center; color: var(--text-color); transition: all var(--transition-speed); }
#theme-toggle:hover { transform: scale(1.1); }
#theme-toggle i { font-size: 1.2rem; }

/* --- 居中搜索容器 --- */
.center-search-container { flex-grow: 1; display: flex; align-items: center; justify-content: center; max-width: 700px; gap: 10px; min-width: 0; }
.search-form { display: flex; align-items: center; width: 100%; flex-grow: 1; height: 42px; border: 1px solid var(--border-color); border-radius: 21px; background-color: var(--background-color); transition: all 0.2s; }
.search-form:hover,
.search-form:focus-within { box-shadow: 0 0 0 4px rgba(0, 123, 255, 0.1); background-color: var(--card-background); }
.search-input { flex-grow: 1; border: none; padding: 0 15px; font-size: 0.95rem; background: transparent; color: var(--text-color); height: 100%; outline: none; }
.search-button { background: transparent; color: var(--light-text-color); border: none; padding: 0 18px; cursor: pointer; height: 100%; font-size: 1.1rem; }
.search-label { display: none; }

/* --- 搜索引擎切换器 --- */
.engine-switcher-desktop { display: flex; align-items: center; gap: 15px; }
.engine-switcher-desktop .engine-item { display: flex; align-items: center; cursor: pointer; transition: all 0.2s; opacity: 0.7; }
.engine-switcher-desktop .engine-item:hover { opacity: 1; }
.engine-switcher-desktop .engine-item.active { opacity: 1; transform: scale(1.15); }
.engine-switcher-desktop .engine-item img { width: 22px; height: 22px; }
.engine-switcher-desktop .engine-item span { display: none; }
.engine-switcher-mobile { display: none; }

/* --- 页面主布局 --- */
.site-wrapper { display: flex; align-items: flex-start; gap: 30px; margin-top: 30px; }
.sidebar { width: 200px; flex-shrink: 0; position: sticky; top: 110px; }
.sidebar nav ul { list-style: none; padding: 0; margin: 0; }
.sidebar nav a { display: block; padding: 12px 20px; text-decoration: none; color: var(--text-color); border-radius: var(--border-radius); margin-bottom: 8px; font-weight: 500; font-size: 0.95rem; transition: all 0.2s; position: relative; border-left: 4px solid transparent; }
.sidebar nav a:hover { background-color: var(--card-background); color: var(--primary-color); border-left-color: var(--primary-color); }
.sidebar nav a.active { background-color: var(--card-background); color: var(--primary-color); font-weight: bold; border-left-color: var(--primary-color); }
.main-content { flex-grow: 1; min-width: 0; }
.category-module { background-color: var(--card-background); border-radius: var(--border-radius); margin-bottom: 30px; box-shadow: var(--shadow); transition: background-color var(--transition-speed); overflow: hidden; }
.module-header { display: flex; justify-content: space-between; align-items: center; padding: 5px 25px; border-bottom: 1px solid var(--border-color); transition: border-color var(--transition-speed); }
.module-title { font-size: 1.1rem; font-weight: 600; margin: 0; display: flex; align-items: center; color: var(--text-color); }
.module-title i { font-size: 1rem; margin-right: 12px; color: var(--primary-color); width: 20px; text-align: center; }
.module-body { padding: 25px; }
.links-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.link-card { background-color: var(--background-color); border-radius: 8px; padding: 10px 12px; display: flex; align-items: center; text-decoration: none; color: var(--text-color); transition: all 0.2s ease; border: 1px solid transparent; overflow: hidden; box-shadow: none; }
.link-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary-color); background-color: var(--card-background); }
.link-icon { flex-shrink: 0; width: 24px; height: 24px; margin-right: 10px; }
.link-icon img { width: 100%; height: 100%; object-fit: contain; border-radius: 4px; }
.link-info { flex-grow: 1; min-width: 0; }
.link-title { font-size: 0.85rem; font-weight: 500; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.main-footer { text-align: center; padding: 30px 0; color: var(--light-text-color); border-top: 1px solid var(--border-color); margin-top: 40px; transition: border-color var(--transition-speed); }

/* --- 响应式设计 --- */
@media (max-width: 1280px) { .links-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 1024px) {
    .sidebar { display: none; }
    .site-wrapper { gap: 0; }
    .links-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    /* --- 手机 --- */
    body { padding-top: 60px; }
    .main-header { height: 60px; }
    .main-header .container { gap: 10px; }
    .logo-image { height: 28px; }
    .engine-switcher-desktop { display: none; }
    .engine-switcher-mobile { display: block; position: relative; }
    .center-search-container { justify-content: flex-start; gap: 8px; }
    .current-engine-icon { cursor: pointer; padding: 6px; border: 1px solid var(--border-color); border-radius: 8px; display: flex; align-items: center; justify-content: center; height: 38px; box-sizing: border-box; }
    .current-engine-icon img { width: 22px; height: 22px; }
    .engine-dropdown { display: none; position: absolute; top: 110%; left: 0; background-color: var(--card-background); border: 1px solid var(--border-color); border-radius: var(--border-radius); box-shadow: var(--shadow); list-style: none; padding: 8px; margin: 0; z-index: 1100; width: 150px; }
    .engine-switcher-mobile.open .engine-dropdown { display: block; }
    .engine-dropdown .engine-item { display: flex; align-items: center; padding: 8px 10px; border-radius: 6px; opacity: 1; }
    .engine-dropdown .engine-item:hover { background-color: var(--background-color); }
    .engine-dropdown .engine-item.active { background-color: var(--background-color); font-weight: bold; }
    .engine-dropdown .engine-item img { width: 18px; height: 18px; margin-right: 10px; }
    .engine-dropdown .engine-item span { font-size: 0.9rem; display: inline; }
    .search-form { height: 38px; }
    .search-button { display: none; }
    
    /* *** 核心修正区域：确保手机端为双列布局 *** */
    .links-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    .module-body { padding: 15px; }
}
@media (max-width: 480px) {
    .container { padding: 0 15px; }
    /* 在超小屏幕上，我们依然保持双列，除非内容实在放不下。
       如果需要在480px以下变为单列，取消下面这行注释即可。*/
    /* .links-grid { grid-template-columns: 1fr; } */
}