:root {
    --brand-red: #C41E20;
    --text-main: #1D1D1F;
    --text-light: #86868B;
    --bg-gray: #F5F5F7;
    --border-light: #E5E5EA;
}

.main-header {
    background-color: #FFF;
    color: var(--text-dark);
}

.header-actions .hotline-box span {
    color: #999;
}

.btn-lang {
    color: var(--text-dark);
}

/* Hero 区块 */
.hero { background: #fff; padding: 100px 10% 60px; text-align: center; border-bottom: 1px solid var(--border-light); }
.hero h1 { font-size: 44px; font-weight: 800; margin-bottom: 20px; color: var(--text-main); }
.hero p { font-size: 18px; color: var(--text-light); max-width: 700px; margin: 0 auto; }

/* 分类导航 Tabs */
.filter-tabs { display: flex; justify-content: center; gap: 15px; margin-top: 40px; flex-wrap: wrap; }
.tab-btn { padding: 10px 24px; border-radius: 30px; background: var(--bg-gray); color: var(--text-main); font-size: 16px; font-weight: 500; cursor: pointer; transition: all 0.3s; border: 1px solid transparent; }
.tab-btn:hover { background: #e8e8ed; }
.tab-btn.active { background: var(--brand-red); color: #fff; box-shadow: 0 4px 12px rgba(196,30,32,0.2); }

/* 下载卡片网格 */
.download-section { padding: 60px 10% 100px; max-width: 1400px; margin: 0 auto; }
.doc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 30px; }

.doc-card { 
    background: #fff; border-radius: 16px; padding: 30px; 
    border: 1px solid var(--border-light);
    display: flex; flex-direction: column; 
    transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative; overflow: hidden;
}
.doc-card:hover { transform: translateY(-6px); box-shadow: 0 15px 35px rgba(0,0,0,0.06); border-color: transparent; }

/* 顶部装饰条 */
.doc-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--border-light); transition: background 0.3s; }
.doc-card:hover::before { background: var(--brand-red); }

.doc-icon { width: 50px; height: 50px; background: rgba(196,30,32,0.05); color: var(--brand-red); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; margin-bottom: 20px; }
.doc-tag { font-size: 12px; color: var(--text-light); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.doc-title { font-size: 20px; font-weight: 600; color: var(--text-main); margin-bottom: 12px; line-height: 1.4; flex-grow: 1; }
.doc-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border-light); }
.doc-size { font-size: 14px; color: var(--text-light); }

/* 下载按钮 */
.btn-download { display: inline-flex; align-items: center; gap: 8px; color: var(--brand-red); font-weight: 600; text-decoration: none; font-size: 15px; transition: opacity 0.3s; }
.btn-download:hover { opacity: 0.7; }
.btn-download svg { width: 18px; height: 18px; fill: currentColor; }


.message {
    padding: 20px;
}