/* ========== 建站系统页 Hero ========== */
.sys-hero {
    background: radial-gradient(circle at 78% 28%, rgba(37,182,210,0.38) 0%, transparent 46%),
                radial-gradient(circle at 18% 82%, rgba(255,255,255,0.10) 0%, transparent 42%),
                linear-gradient(135deg, #173A66 0%, #1F4E8C 48%, #1E86A8 100%);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}
.sys-hero::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image:
        linear-gradient(rgba(37,182,210,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37,182,210,0.08) 1px, transparent 1px);
    background-size: 60px 60px;
}
.sys-hero-inner {
    position: relative;
    z-index: 2;
    color: #fff;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}
.sys-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(255,255,255,0.12);
    border-radius: 20px;
    font-size: 13px;
    color: #D6E4F2;
    margin-bottom: 24px;
    backdrop-filter: blur(4px);
}
.sys-hero-badge .dot {
    width: 8px; height: 8px;
    background: #FFB020;
    border-radius: 50%;
}
.sys-hero h1 {
    font-size: 42px;
    font-weight: bold;
    line-height: 1.3;
    margin-bottom: 20px;
}
.sys-hero h1 span {
    color: #7FE0F0;
}
.sys-hero-sub {
    font-size: 17px;
    color: #CFE4F5;
    line-height: 1.8;
    margin-bottom: 32px;
}
.sys-hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.sys-hero-btn-primary {
    display: inline-block;
    padding: 14px 38px;
    background: #FFB020;
    color: #1A2B4A;
    font-size: 15px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
}
.sys-hero-btn-primary:hover { background: #E89A0F; }
.sys-hero-btn-secondary {
    display: inline-block;
    padding: 14px 38px;
    background: transparent;
    color: #fff;
    font-size: 15px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 4px;
    transition: all 0.3s;
}
.sys-hero-btn-secondary:hover { border-color: #25B6D2; color: #7FE0F0; }

/* ========== 统计数据 ========== */
.sys-stats { background: #F4F8FB; padding: 40px 0; }
.sys-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sys-stat-item { text-align: center; padding: 20px; }
.sys-stat-num { font-size: 36px; font-weight: bold; color: #1F4E8C; line-height: 1; }
.sys-stat-label { font-size: 13px; color: #5C6E86; margin-top: 8px; }

/* ========== 系统架构 ========== */
.sys-arch { background: #FFFFFF; }
.sys-arch-diagram { display: flex; flex-direction: column; gap: 12px; max-width: 800px; margin: 0 auto; }
.sys-arch-layer {
    background: #F4F8FB;
    border: 1px solid #E4EDF5;
    border-radius: 6px;
    padding: 24px 28px;
    position: relative;
    overflow: hidden;
}
.sys-arch-layer::before {
    content: "";
    position: absolute;
    left: 0; top: 0;
    width: 4px; height: 100%;
    background: linear-gradient(180deg, #1F4E8C, #25B6D2);
}
.sys-layer-front { border-left: none; }
.sys-layer-label { font-size: 16px; font-weight: 600; color: #1A2B4A; margin-bottom: 6px; }
.sys-layer-desc { font-size: 14px; color: #5C6E86; line-height: 1.7; }

/* ========== 核心模块 ========== */
.sys-modules { background: #F4F8FB; }
.sys-module-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.sys-module-card {
    background: #FFFFFF;
    border: 1px solid #E4EDF5;
    border-radius: 6px;
    padding: 32px 24px;
    transition: all 0.3s;
}
.sys-module-card:hover { box-shadow: 0 8px 30px rgba(31,78,140,0.12); transform: translateY(-4px); border-color: #BFD6EE; }
.sys-module-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, rgba(37,182,210,0.14), rgba(31,78,140,0.08));
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: #1F4E8C;
    margin-bottom: 20px;
}
.sys-module-card h3 { font-size: 17px; color: #1A2B4A; margin-bottom: 10px; font-weight: 600; }
.sys-module-card p { font-size: 14px; color: #5C6E86; line-height: 1.8; }

/* ========== SEO/GEO ========== */
.sys-seo { background: #FFFFFF; }
.sys-seo-wrap { display: flex; gap: 50px; align-items: flex-start; }
.sys-seo-info { flex: 1; }
.sys-seo-info .en-title { font-size: 13px; color: #25B6D2; letter-spacing: 4px; text-transform: uppercase; margin-bottom: 10px; font-weight: 600; }
.sys-seo-info h2 { font-size: 28px; font-weight: bold; color: #1A2B4A; margin-bottom: 16px; }
.sys-seo-info > p { font-size: 15px; color: #5C6E86; line-height: 1.8; margin-bottom: 28px; }
.sys-seo-list { list-style: none; }
.sys-seo-list li { display: flex; gap: 14px; margin-bottom: 22px; }
.sys-seo-check {
    flex-shrink: 0;
    width: 28px; height: 28px;
    background: linear-gradient(135deg, #1F4E8C, #25B6D2);
    border-radius: 50%;
    color: #fff;
    font-size: 14px;
    font-weight: bold;
    display: flex; align-items: center; justify-content: center;
    margin-top: 2px;
}
.sys-seo-list strong { font-size: 15px; color: #1A2B4A; display: block; margin-bottom: 4px; }
.sys-seo-list p { font-size: 13px; color: #5C6E86; line-height: 1.7; margin: 0; }
.sys-seo-visual { flex: 0 0 420px; }
.sys-seo-terminal {
    background: #1A2B4A;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #163B6B;
}
.sys-term-bar { padding: 10px 14px; background: #122038; display: flex; gap: 6px; }
.sys-term-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.sys-term-bar .dot.red { background: #e74c3c; }
.sys-term-bar .dot.yellow { background: #FFB020; }
.sys-term-bar .dot.green { background: #25B6D2; }
.sys-term-body { padding: 20px; font-family: "Courier New", monospace; font-size: 13px; line-height: 2; }
.sys-term-line { color: #D6E4F2; }
.sys-term-prompt { color: #25B6D2; margin-right: 6px; }
.sys-term-out { color: #7FE0F0; }

/* ========== 技术栈 ========== */
.sys-tech { background: #F4F8FB; }
.sys-tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.sys-tech-card {
    background: #FFFFFF;
    border: 1px solid #E4EDF5;
    border-radius: 6px;
    padding: 28px 24px;
    transition: all 0.3s;
}
.sys-tech-card:hover { box-shadow: 0 6px 20px rgba(31,78,140,0.10); border-color: #BFD6EE; }
.sys-tech-tag {
    display: inline-block;
    padding: 4px 12px;
    background: #E8F0FA;
    color: #1F4E8C;
    font-size: 12px;
    font-weight: 500;
    border-radius: 3px;
    margin-bottom: 14px;
}
.sys-tech-card h4 { font-size: 17px; color: #1A2B4A; margin-bottom: 10px; font-weight: 600; }
.sys-tech-card p { font-size: 14px; color: #5C6E86; line-height: 1.7; }

/* ========== 安全与性能 ========== */
.sys-perf { background: #FFFFFF; }
.sys-perf-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.sys-perf-item {
    display: flex; gap: 16px;
    padding: 24px;
    background: #F4F8FB;
    border: 1px solid #E4EDF5;
    border-radius: 6px;
    transition: all 0.3s;
}
.sys-perf-item:hover { border-color: #1F4E8C; background: #FFFFFF; box-shadow: 0 4px 16px rgba(31,78,140,0.08); }
.sys-perf-icon {
    flex-shrink: 0;
    width: 48px; height: 48px;
    background: linear-gradient(135deg, #1F4E8C, #25B6D2);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
}
.sys-perf-item h4 { font-size: 16px; color: #1A2B4A; margin-bottom: 6px; font-weight: 600; }
.sys-perf-item p { font-size: 14px; color: #5C6E86; line-height: 1.7; }

/* ========== CTA ========== */
.sys-cta { background: linear-gradient(135deg, #173A66 0%, #1F4E8C 50%, #1E86A8 100%); padding: 70px 0; }
.sys-cta-inner { text-align: center; color: #fff; }
.sys-cta-inner h2 { font-size: 30px; font-weight: bold; margin-bottom: 16px; }
.sys-cta-inner p { font-size: 16px; color: rgba(255,255,255,0.75); margin-bottom: 30px; }
.sys-cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.sys-cta-btn-primary {
    display: inline-block;
    padding: 14px 38px;
    background: #FFB020;
    color: #1A2B4A;
    font-size: 15px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
}
.sys-cta-btn-primary:hover { background: #E89A0F; }
.sys-cta-btn-secondary {
    display: inline-block;
    padding: 14px 38px;
    background: transparent;
    color: #fff;
    font-size: 15px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 4px;
    transition: all 0.3s;
}
.sys-cta-btn-secondary:hover { border-color: #25B6D2; color: #7FE0F0; }

/* ========== 下载列表 ========== */
.sys-download { background: #FFFFFF; padding: 60px 0; }
.sys-download-list {
    max-width: 800px;
    margin: 0 auto;
}
.sys-download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 28px 32px;
    border: 1px solid #E4EDF5;
    border-radius: 6px;
    margin-bottom: 16px;
    transition: all 0.3s;
    background: #FFFFFF;
}
.sys-download-item:hover {
    border-color: #BFD6EE;
    box-shadow: 0 4px 16px rgba(31,78,140,0.08);
}
.sys-download-title {
    font-size: 20px;
    font-weight: 600;
    color: #1A2B4A;
    margin-bottom: 10px;
}
.sys-download-meta {
    display: flex;
    gap: 24px;
    font-size: 14px;
    color: #5C6E86;
}
.sys-download-version { color: #1F4E8C; font-weight: 500; }
.sys-download-date { color: #98A2AD; }
.sys-download-btn {
    display: inline-block;
    padding: 10px 28px;
    background: #FFB020;
    color: #1A2B4A;
    font-size: 14px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
    white-space: nowrap;
}
.sys-download-btn:hover {
    background: #E89A0F;
    transform: translateY(-1px);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .sys-module-grid { grid-template-columns: repeat(2, 1fr); }
    .sys-tech-grid { grid-template-columns: repeat(2, 1fr); }
    .sys-seo-wrap { flex-direction: column; }
    .sys-seo-visual { flex: none; width: 100%; max-width: 420px; }
}
@media (max-width: 768px) {
    .sys-hero h1 { font-size: 28px; }
    .sys-hero { padding: 60px 0; }
    .sys-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .sys-module-grid { grid-template-columns: 1fr; }
    .sys-tech-grid { grid-template-columns: 1fr; }
    .sys-perf-grid { grid-template-columns: 1fr; }
    .sys-download-item { flex-direction: column; align-items: flex-start; gap: 16px; }
    .sys-download-btn { align-self: flex-start; }
}