:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #f8fafc;
    --dot-color: #cbd5e1;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-sub: #64748b;
    --border: #e2e8f0;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --header-height: 64px;
}

* { box-sizing: border-box; margin: 0; padding: 0; outline: none; -webkit-tap-highlight-color: transparent; }

body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; 
    color: var(--text); 
    line-height: 1.6; 
    font-size: 16px;
    background-color: var(--bg-color);
    background-image: radial-gradient(var(--dot-color) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    min-height: 100vh;
}

a { text-decoration: none; color: inherit; transition: color 0.2s; }
ul { list-style: none; }

/* ================= 导航栏 ================= */
.navbar { 
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    position: sticky; top: 0; z-index: 50; 
    border-bottom: 1px solid rgba(255,255,255,0.3);
}
.nav-content { max-width: 1000px; margin: 0 auto; padding: 0 24px; height: var(--header-height); display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 800; font-size: 1.3rem; display: flex; align-items: center; gap: 12px; color: var(--primary); letter-spacing: -0.5px; }
.logo img { height: 36px; width: 36px; border-radius: 8px; box-shadow: 0 2px 5px rgba(99, 102, 241, 0.2); }
.nav-links { display: flex; gap: 20px; align-items: center; font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--primary); }
.mobile-menu-btn { display: none; background: transparent; border: none; color: var(--text); cursor: pointer; padding: 5px; }

/* ================= 布局组件 ================= */
.container { max-width: 960px; margin: 30px auto; padding: 0 20px; width: 100%; }
.card { 
    background: var(--card-bg); border-radius: 16px; padding: 30px; margin-bottom: 24px; 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02); border: 1px solid rgba(255, 255, 255, 0.6);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05); }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 8px; cursor: pointer; font-size: 0.95rem; font-weight: 500; transition: all 0.2s ease; border: 1px solid transparent; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25); }
.btn-primary:hover { box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4); transform: translateY(-1px); }
.btn-danger { background: #ef4444; color: white; box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2); }
.btn-ghost { background: transparent; color: var(--text-sub); }
.btn-ghost:hover { background: #f1f5f9; color: var(--text); }

.input, .textarea { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 8px; background: #fff; font-size: 1rem; }
.input:focus, .textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1); }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1.5rem; }
.mt-4 { margin-top: 1.5rem; }
.hidden { display: none !important; }

/* ================= 业务组件 ================= */
.code-box { background: #f1f5f9; padding: 12px 16px; border-radius: 8px; border: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px; font-family: monospace; font-size: 0.85rem; }
.code-box span { word-break: break-all; color: var(--text-sub); }

.upload-area { border: 2px dashed #cbd5e1; border-radius: 12px; padding: 50px 20px; text-align: center; color: var(--text-sub); background: #f8fafc; cursor: pointer; position: relative; }
.upload-area:hover { border-color: var(--primary); background: #eef2ff; color: var(--primary); }
.btn-group { display: flex; gap: 12px; flex-wrap: wrap; }
.type-btn { flex: 1; border: 1px solid var(--border); background: #fff; color: var(--text-sub); min-width: 90px; }
.type-btn.active { border-color: var(--primary); background: #eef2ff; color: var(--primary); font-weight: 600; }
.file-item { display: flex; align-items: center; gap: 12px; background: #fff; padding: 12px; border-radius: 8px; margin-top: 12px; border: 1px solid var(--border); }
.progress-wrap { height: 6px; background: #f1f5f9; border-radius: 3px; overflow: hidden; margin-top: 6px; }
.progress-bar { height: 100%; background: var(--primary); transition: width 0.3s; }

/* ================= 后台管理 (PC) ================= */
.admin-layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-width); background: #fff; border-right: 1px solid var(--border); display: flex; flex-direction: column; position: fixed; height: 100%; top: 0; left: 0; z-index: 40; transition: transform 0.3s ease, width 0.3s ease; }
.sidebar-header { height: var(--header-height); display: flex; align-items: center; padding: 0 24px; font-weight: 700; color: var(--primary); border-bottom: 1px solid var(--border); }
.sidebar-menu { padding: 20px 12px; flex: 1; overflow-y: auto; }
.menu-item { display: flex; align-items: center; padding: 12px 16px; color: var(--text-sub); border-radius: 8px; margin-bottom: 4px; cursor: pointer; transition: 0.2s; }
.menu-item:hover, .menu-item.active { background: #eef2ff; color: var(--primary); font-weight: 600; }
.menu-item svg { margin-right: 12px; width: 20px; height: 20px; }
.sidebar-footer { padding: 20px; border-top: 1px solid var(--border); }

.main-content { margin-left: var(--sidebar-width); width: calc(100% - var(--sidebar-width)); padding: 30px; transition: margin-left 0.3s ease, width 0.3s ease; }
.top-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 25px; }

/* 折叠逻辑 */
.sidebar.collapsed { width: var(--sidebar-collapsed-width); }
.sidebar.collapsed .menu-label, .sidebar.collapsed .sidebar-header span, .sidebar.collapsed .sidebar-footer span { display: none; }
.sidebar.collapsed .menu-item { justify-content: center; }
.sidebar.collapsed .menu-item svg { margin: 0; }
.sidebar.collapsed + .main-content { margin-left: var(--sidebar-collapsed-width); width: calc(100% - var(--sidebar-collapsed-width)); }

/* 表格 */
.table-responsive { width: 100%; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 600px; /* 关键：设置最小宽度防止挤压 */ }
th, td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; vertical-align: middle; }
th { background: #f8fafc; font-weight: 600; color: var(--text-sub); white-space: nowrap; }
.thumb { width: 44px; height: 44px; border-radius: 6px; object-fit: cover; border: 1px solid var(--border); display: block; }
.badge { padding: 4px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; }
.badge.landscape { background: #dbeafe; color: #1e40af; }
.badge.portrait { background: #fce7f3; color: #9d174d; }
.badge.square { background: #ffedd5; color: #c2410c; }

/* ================= 移动端适配 (重要修复) ================= */
@media (max-width: 768px) {
    /* 1. 布局重置 */
    .grid-2, .grid-3 { grid-template-columns: 1fr; gap: 16px; }
    .container, .main-content { padding: 16px; margin: 0 auto; }
    .card { padding: 20px; }
    
    /* 2. 侧栏修复：默认隐藏在左侧，层级最高 */
    .sidebar { 
        transform: translateX(-100%); 
        width: 260px !important; 
        z-index: 100; /* 确保在遮罩层之上 */
        box-shadow: 5px 0 25px rgba(0,0,0,0.15); 
    }
    .sidebar.mobile-open { transform: translateX(0); }
    .sidebar.collapsed { width: 260px !important; } /* 移动端不折叠，只开关 */
    
    /* 3. 内容区域重置 */
    .main-content { margin-left: 0 !important; width: 100% !important; }
    .sidebar.collapsed + .main-content { margin-left: 0 !important; width: 100% !important; }

    /* 4. 遮罩层 */
    .sidebar-overlay { 
        position: fixed; inset: 0; background: rgba(0,0,0,0.5); 
        z-index: 99; /* 在侧栏之下，内容之上 */
        display: none; backdrop-filter: blur(2px); 
    }
    .sidebar-overlay.show { display: block; }

    /* 5. 导航栏修复 */
    .nav-links { 
        position: absolute; top: var(--header-height); left: 0; width: 100%; 
        background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--border);
        flex-direction: column; max-height: 0; overflow: hidden; transition: all 0.3s;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }
    .nav-links.open { max-height: 400px; padding-bottom: 10px; }
    .nav-links a { padding: 15px 24px; border-bottom: 1px solid #f1f5f9; width: 100%; display: block; }
    .mobile-menu-btn { display: block; }

    /* 6. 表格修复：强制滚动 */
    .table-responsive { 
        display: block; 
        overflow-x: auto; 
        -webkit-overflow-scrolling: touch; 
    }
    /* 减少内边距以显示更多内容 */
    th, td { padding: 10px 12px; }
    /* 强制某些列不换行 */
    td { white-space: nowrap; }
}