<?php
session_start();
if (!isset($_SESSION['user_id'])) {
    header('Location: login.php');
    exit;
}

$user_type = $_SESSION['user_type'] ?? 0;
$user_name = $_SESSION['user_email'] ?? '用户';
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户中心 - 刊小探</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap" rel="stylesheet">
    <style>
        :root {
            --primary: #1A365D;
            --primary-light: #2C5282;
            --secondary: #3182CE;
            --accent: #D69E2E;
            --bg-light: #F7FAFC;
            --bg-white: #FFFFFF;
            --text-dark: #1A202C;
            --text-gray: #4A5568;
            --text-light: #718096;
            --border: #E2E8F0;
            --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
        }
        * { margin:0; padding:0; box-sizing:border-box; }
        body {
            font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
        }
        /* 顶部导航 */
        .topbar {
            background: var(--primary);
            color: white;
            padding: 0 24px;
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .topbar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            color: white;
        }
        .topbar .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
        }
        .topbar .user-menu {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .topbar .user-menu a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }
        .topbar .user-menu a:hover {
            color: var(--accent);
        }
        .topbar .user-avatar {
            width: 36px;
            height: 36px;
            background: var(--secondary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 14px;
        }
        /* 主布局 */
        .main-layout {
            display: flex;
            min-height: calc(100vh - 64px);
        }
        /* 侧边栏 */
        .sidebar {
            width: 240px;
            background: white;
            border-right: 1px solid var(--border);
            padding: 24px 0;
            flex-shrink: 0;
        }
        .sidebar-nav {
            list-style: none;
        }
        .sidebar-nav li {
            margin-bottom: 4px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 24px;
            color: var(--text-gray);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s;
            border-left: 3px solid transparent;
        }
        .sidebar-nav a:hover,
        .sidebar-nav a.active {
            background: var(--bg-light);
            color: var(--primary);
            border-left-color: var(--secondary);
        }
        .sidebar-nav a .nav-icon {
            width: 20px;
            text-align: center;
            font-size: 16px;
        }
        .sidebar-section {
            padding: 12px 24px;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-top: 16px;
        }
        /* 内容区 */
        .content {
            flex: 1;
            padding: 32px;
        }
        .page-header {
            margin-bottom: 32px;
        }
        .page-title {
            font-size: 24px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .page-subtitle {
            font-size: 14px;
            color: var(--text-gray);
        }
        /* 功能卡片 */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 32px;
            border: 1px solid var(--border);
            transition: all 0.3s;
            cursor: pointer;
            text-decoration: none;
            color: inherit;
            display: block;
        }
        .service-card:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .service-card .card-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--secondary), var(--primary-light));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 16px;
        }
        .service-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .service-card p {
            font-size: 14px;
            color: var(--text-gray);
            line-height: 1.6;
        }
        .service-card .card-badge {
            display: inline-block;
            padding: 4px 10px;
            background: rgba(49,130,206,0.1);
            color: var(--secondary);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 500;
            margin-top: 12px;
        }
        /* 统计卡片 */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 32px;
        }
        .stat-card {
            background: white;
            border-radius: 12px;
            padding: 24px;
            border: 1px solid var(--border);
            text-align: center;
        }
        .stat-card .stat-num {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
        }
        .stat-card .stat-label {
            font-size: 13px;
            color: var(--text-gray);
            margin-top: 4px;
        }
        /* 响应式 */
        @media (max-width: 768px) {
            .sidebar {
                display: none;
            }
            .content {
                padding: 20px;
            }
            .stats-row {
                grid-template-columns: 1fr;
            }
            .service-grid {
                grid-template-columns: 1fr;
            }
        }
    </style>
</head>
<body>
    <!-- 顶部导航 -->
    <div class="topbar">
        <a href="/" class="logo">
            <div class="logo-icon">刊</div>
            刊小探
        </a>
        <div class="user-menu">
            <a href="/">返回首页</a>
            <div class="user-avatar"><?php echo mb_substr($_SESSION['user_email'] ?? 'U', 0, 1); ?></div>
            <a href="logout.php">退出登录</a>
        </div>
    </div>

    <div class="main-layout">
        <!-- 侧边栏 -->
        <aside class="sidebar">
            <ul class="sidebar-nav">
                <li><a href="dashboard.php" class="active"><span class="nav-icon">📊</span>工作台</a></li>
                <li><a href="#"><span class="nav-icon">📄</span>我的稿件</a></li>
                <li><a href="review_journal.php"><span class="nav-icon">✍️</span>AI 审稿</a></li>
                <li><a href="#"><span class="nav-icon">🔍</span>AI 期刊推荐</a></li>
                <li><a href="#"><span class="nav-icon">📚</span>学术资源</a></li>
                <li class="sidebar-section">设置</li>
                <li><a href="#"><span class="nav-icon">👤</span>个人资料</a></li>
                <li><a href="#"><span class="nav-icon">🔒</span>修改密码</a></li>
            </ul>
        </aside>

        <!-- 主内容 -->
        <main class="content">
            <div class="page-header">
                <h1 class="page-title">欢迎回来 👋</h1>
                <p class="page-subtitle">今天准备发表什么研究成果？</p>
            </div>

            <!-- 统计区 -->
            <div class="stats-row">
                <div class="stat-card">
                    <div class="stat-num">0</div>
                    <div class="stat-label">已上传稿件</div>
                </div>
                <div class="stat-card">
                    <div class="stat-num">0</div>
                    <div class="stat-label">已完成分析</div>
                </div>
                <div class="stat-card">
                    <div class="stat-num">0</div>
                    <div class="stat-label">推荐期刊</div>
                </div>
            </div>

            <!-- 功能入口 -->
            <div class="service-grid">
                <a href="#" class="service-card">
                    <div class="card-icon">🔍</div>
                    <h3>AI 期刊推荐</h3>
                    <p>上传稿件，智能分析内容，精准匹配最适合的投稿期刊</p>
                    <span class="card-badge">即将上线</span>
                </a>
                <a href="#" class="service-card">
                    <div class="card-icon">✍️</div>
                    <h3>AI 审稿分析</h3>
                    <p>模拟专家审稿，提前发现稿件问题，提升录用率</p>
                    <span class="card-badge">即将上线</span>
                </a>
                <a href="#" class="service-card">
                    <div class="card-icon">📚</div>
                    <h3>学术资源查询</h3>
                    <p>一站式查询期刊指标、审稿周期、录用率等信息</p>
                    <span class="card-badge">即将上线</span>
                </a>
            </div>
        </main>
    </div>
</body>
</html>