/* ===== 全局重置与变量 ===== */
:root {
    --primary: #7C3AED;
    --primary-light: #A855F7;
    --secondary: #2563EB;
    --secondary-light: #3B82F6;
    --gradient: linear-gradient(135deg, #7C3AED 0%, #2563EB 100%);
    --gradient-text: linear-gradient(135deg, #7C3AED 0%, #4F46E5 50%, #2563EB 100%);
    --bg-light: #F8FAFF;
    --bg-white: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --shadow-sm: 0 2px 8px rgba(124, 58, 237, 0.08);
    --shadow-md: 0 8px 30px rgba(124, 58, 237, 0.12);
    --shadow-lg: 0 20px 60px rgba(124, 58, 237, 0.15);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background: var(--bg-light);
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 渐变文字 ===== */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius-full);
    font-size: 15px; font-weight: 600; border: none; cursor: pointer;
    transition: all 0.3s ease; white-space: nowrap;
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-primary {
    background: var(--gradient); color: white;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4); }
.btn-secondary {
    background: rgba(37, 99, 235, 0.1); color: var(--secondary);
    border: 1.5px solid rgba(37, 99, 235, 0.3);
}
.btn-secondary:hover { background: rgba(37, 99, 235, 0.15); transform: translateY(-2px); }
.btn-outline {
    background: transparent; color: var(--primary);
    border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; transform: translateY(-2px); }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    transition: all 0.3s ease;
}
.navbar.scrolled { background: rgba(255, 255, 255, 0.95); box-shadow: var(--shadow-sm); }
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    height: 70px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { width: 36px; height: 36px; }
.logo-text {
    font-size: 20px; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav-menu { display: flex; align-items: center; gap: 32px; }
.nav-link {
    font-size: 15px; font-weight: 500; color: var(--text-secondary);
    transition: color 0.3s ease; position: relative;
}
.nav-link:hover { color: var(--primary); }
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
    background: var(--gradient); transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.menu-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.menu-toggle span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all 0.3s ease; }

/* ===== Hero区域 ===== */
.hero {
    position: relative; min-height: 100vh; display: flex;
    align-items: center; justify-content: center; overflow: hidden; padding-top: 70px;
}
.hero-bg {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, #EEF2FF 0%, #E0E7FF 30%, #DBEAFE 60%, #F0F4FF 100%);
    z-index: 0;
}
.hero-glow {
    position: absolute; border-radius: 50%; filter: blur(80px);
    opacity: 0.5; animation: float 8s ease-in-out infinite;
}
.glow-1 { width: 400px; height: 400px; background: radial-gradient(circle, #A855F7 0%, transparent 70%); top: 10%; left: 10%; }
.glow-2 { width: 500px; height: 500px; background: radial-gradient(circle, #3B82F6 0%, transparent 70%); top: 20%; right: 5%; animation-delay: -3s; }
.glow-3 { width: 350px; height: 350px; background: radial-gradient(circle, #818CF8 0%, transparent 70%); bottom: 10%; left: 30%; animation-delay: -5s; }
@keyframes float { 0%,100%{transform:translate(0,0) scale(1)} 50%{transform:translate(30px,-30px) scale(1.1)} }

.hero-content { position: relative; z-index: 1; text-align: center; max-width: 900px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 20px; background: rgba(255,255,255,0.7); backdrop-filter: blur(10px);
    border-radius: var(--radius-full); font-size: 14px; font-weight: 500;
    color: var(--text-secondary); margin-bottom: 32px; box-shadow: var(--shadow-sm);
}
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.3)} }

.hero-title { font-size: clamp(32px, 5vw, 56px); font-weight: 800; line-height: 1.2; margin-bottom: 24px; letter-spacing: -0.02em; }
.hero-subtitle { font-size: clamp(16px, 2vw, 20px); color: var(--text-secondary); margin-bottom: 40px; font-weight: 400; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-scroll-hint {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    color: var(--text-light); font-size: 13px; z-index: 1; animation: bounce 2s ease-in-out infinite;
}
.scroll-arrow { width: 20px; height: 20px; border-right: 2px solid var(--text-light); border-bottom: 2px solid var(--text-light); transform: rotate(45deg); }
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(10px)} }

/* ===== 通用Section ===== */
.section { padding: 100px 0; position: relative; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-label {
    display: inline-flex; align-items: center; gap: 12px;
    font-size: 16px; font-weight: 600; color: var(--secondary); margin-bottom: 20px;
}
.section-label::before, .section-label::after {
    content: ''; width: 40px; height: 1px;
    background: linear-gradient(90deg, transparent, var(--secondary), transparent);
}
.section-title { font-size: clamp(28px, 4vw, 44px); font-weight: 800; line-height: 1.2; margin-bottom: 16px; letter-spacing: -0.02em; }
.section-subtitle { font-size: clamp(15px, 1.5vw, 18px); color: var(--text-secondary); max-width: 700px; margin: 0 auto; }

/* ===== 效果监测区域 ===== */
.monitor-section { background: linear-gradient(180deg, #F0F4FF 0%, #F8FAFF 100%); }
.monitor-search {
    max-width: 600px; margin: 0 auto 40px; display: flex; gap: 12px;
    background: white; padding: 8px; border-radius: var(--radius-full); box-shadow: var(--shadow-md);
}
.search-input {
    flex: 1; border: none; outline: none; padding: 12px 20px;
    font-size: 15px; background: transparent; color: var(--text-primary);
}
.search-input::placeholder { color: var(--text-light); }
.search-btn { flex-shrink: 0; }
.platform-tags { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 60px; }
.platform-tag {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; background: white; border: 1.5px solid var(--border);
    border-radius: var(--radius-full); font-size: 14px; font-weight: 500;
    color: var(--text-secondary); cursor: pointer; transition: all 0.3s ease;
}
.platform-tag:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.platform-tag.active {
    background: var(--gradient); color: white; border-color: transparent;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}
.tag-dot { width: 10px; height: 10px; border-radius: 50%; }
.tag-icon { font-size: 14px; }

/* ===== 功能卡片 ===== */
.feature-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: white; padding: 40px 32px; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); transition: all 0.4s ease;
    position: relative; overflow: hidden;
}
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--gradient); transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease;
}
.feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-num {
    font-size: 48px; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    margin-bottom: 16px; line-height: 1;
}
.feature-title { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--text-primary); }
.feature-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.feature-tags span {
    padding: 4px 12px; background: rgba(124, 58, 237, 0.08);
    color: var(--primary); border-radius: var(--radius-full); font-size: 12px; font-weight: 500;
}

/* ===== 信源监测区域 ===== */
.source-section { background: var(--bg-white); }
.time-filters { display: flex; gap: 12px; justify-content: center; margin-bottom: 48px; }
.time-filter {
    padding: 10px 24px; background: white; border: 1.5px solid var(--border);
    border-radius: var(--radius-full); font-size: 14px; font-weight: 500;
    color: var(--text-secondary); cursor: pointer; transition: all 0.3s ease;
}
.time-filter:hover { border-color: var(--primary); color: var(--primary); }
.time-filter.active { background: var(--gradient); color: white; border-color: transparent; }
.source-dashboard { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.source-chart { display: flex; justify-content: center; }
.donut-chart { position: relative; width: 320px; height: 320px; }
.donut-svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.donut-center { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; }
.donut-title { font-size: 16px; font-weight: 600; color: var(--text-secondary); }
.source-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.source-item {
    display: flex; align-items: center; gap: 10px; padding: 10px 14px;
    background: var(--bg-light); border-radius: var(--radius-sm); transition: all 0.3s ease;
}
.source-item:hover { background: rgba(124, 58, 237, 0.06); transform: translateX(4px); }
.source-rank {
    width: 24px; height: 24px; display: flex; align-items: center; justify-content: center;
    background: var(--gradient); color: white; border-radius: 50%; font-size: 12px; font-weight: 700; flex-shrink: 0;
}
.source-name { flex: 1; font-size: 13px; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.source-percent { font-size: 13px; font-weight: 700; color: var(--primary); flex-shrink: 0; }

/* ===== 行业洞察区域 ===== */
.industry-section { background: linear-gradient(180deg, #F8FAFF 0%, #EEF2FF 100%); }
.industry-desc { text-align: center; font-size: 17px; color: var(--text-secondary); margin-bottom: 48px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 48px; }
.stat-card {
    background: white; padding: 36px 24px; border-radius: var(--radius-lg);
    text-align: center; box-shadow: var(--shadow-sm); transition: all 0.4s ease;
}
.stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.stat-number { font-size: 36px; font-weight: 800; margin-bottom: 8px; line-height: 1.1; }
.stat-label { font-size: 16px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.stat-sublabel { font-size: 12px; color: var(--text-light); line-height: 1.5; }
.industry-highlight {
    text-align: center; padding: 28px 40px; background: white;
    border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border-left: 4px solid var(--primary);
}
.industry-highlight p { font-size: 16px; color: var(--text-secondary); line-height: 1.8; }
.industry-highlight strong { color: var(--primary); font-weight: 700; }

/* ===== 核心概念区域 ===== */
.concept-section { background: var(--bg-white); }
.concept-desc { text-align: center; font-size: 17px; color: var(--text-secondary); margin-bottom: 48px; }
.concept-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.concept-card {
    padding: 32px 24px; background: linear-gradient(135deg, #F8FAFF 0%, #EEF2FF 100%);
    border-radius: var(--radius-lg); border: 1px solid rgba(124, 58, 237, 0.1);
    transition: all 0.4s ease; position: relative;
}
.concept-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(124, 58, 237, 0.3); }
.concept-num {
    font-size: 32px; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    margin-bottom: 12px;
}
.concept-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.concept-card .concept-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; text-align: left; margin-bottom: 0; }

/* ===== 官网资讯中心 ===== */
.home-news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.home-news-card {
    display: flex; flex-direction: column; min-height: 300px; padding: 32px;
    background: linear-gradient(145deg, #FFFFFF 0%, #F8FAFF 100%);
    border: 1px solid rgba(124, 58, 237, 0.12); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); transition: all 0.35s ease;
}
.home-news-card:hover { transform: translateY(-7px); border-color: rgba(124, 58, 237, 0.3); box-shadow: var(--shadow-lg); }
.home-news-meta { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 22px; font-size: 12px; color: var(--text-light); }
.home-news-meta span { color: var(--primary); font-weight: 700; padding: 4px 10px; background: rgba(124, 58, 237, 0.08); border-radius: var(--radius-full); }
.home-news-card h3 { font-size: 21px; line-height: 1.5; margin-bottom: 14px; }
.home-news-card h3 a:hover { color: var(--primary); }
.home-news-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.8; margin-bottom: 24px; flex: 1; }
.home-news-more { color: var(--primary); font-size: 14px; font-weight: 700; }
.home-news-cta { text-align: center; margin-top: 48px; }

/* ===== 产品服务区域 ===== */
.service-section { background: linear-gradient(180deg, #EEF2FF 0%, #F8FAFF 100%); }
.service-desc { text-align: center; font-size: 16px; color: var(--text-secondary); max-width: 800px; margin: 0 auto 48px; line-height: 1.8; }
.service-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
    background: white; padding: 40px 32px; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); transition: all 0.4s ease;
    position: relative; display: flex; flex-direction: column;
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.service-card-featured { border: 2px solid var(--primary); transform: scale(1.03); }
.service-card-featured:hover { transform: scale(1.03) translateY(-8px); }
.service-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    padding: 4px 16px; background: var(--gradient); color: white;
    border-radius: var(--radius-full); font-size: 12px; font-weight: 600;
}
.service-num {
    font-size: 40px; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    margin-bottom: 16px;
}
.service-title { font-size: 22px; font-weight: 700; margin-bottom: 14px; color: var(--text-primary); }
.service-card .service-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px; flex: 1; text-align: left; }
.service-btn { align-self: flex-start; }

/* ===== 核心技术区域 ===== */
.tech-section { background: var(--bg-white); }
.tech-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.tech-card {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFF 100%);
    padding: 40px 32px; border-radius: var(--radius-lg);
    border: 1px solid rgba(124, 58, 237, 0.1); transition: all 0.4s ease;
    position: relative; overflow: hidden;
}
.tech-card::after {
    content: ''; position: absolute; top: -50%; right: -50%;
    width: 200px; height: 200px; background: radial-gradient(circle, rgba(124,58,237,0.08) 0%, transparent 70%); border-radius: 50%;
}
.tech-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: rgba(124,58,237,0.25); }
.tech-icon { width: 56px; height: 56px; margin-bottom: 20px; }
.tech-icon svg { width: 100%; height: 100%; }
.tech-num {
    position: absolute; top: 24px; right: 28px; font-size: 48px; font-weight: 800;
    color: rgba(124, 58, 237, 0.08); line-height: 1;
}
.tech-title { font-size: 20px; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); position: relative; z-index: 1; }
.tech-features { position: relative; z-index: 1; }
.tech-features li {
    font-size: 14px; color: var(--text-secondary); line-height: 1.7;
    padding: 8px 0 8px 20px; position: relative; border-bottom: 1px solid rgba(226,232,240,0.5);
}
.tech-features li:last-child { border-bottom: none; }
.tech-features li::before {
    content: ''; position: absolute; left: 0; top: 16px;
    width: 8px; height: 8px; background: var(--gradient); border-radius: 50%;
}

/* ===== 服务方案区域 ===== */
.solution-section { background: linear-gradient(180deg, #F8FAFF 0%, #EEF2FF 100%); }
.solution-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.solution-card {
    background: white; padding: 36px 28px; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); transition: all 0.4s ease; display: flex; flex-direction: column;
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.solution-title { font-size: 20px; font-weight: 700; margin-bottom: 14px; color: var(--text-primary); }
.solution-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; flex: 1; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.solution-tags span {
    padding: 4px 12px; background: rgba(37, 99, 235, 0.08);
    color: var(--secondary); border-radius: var(--radius-full); font-size: 12px; font-weight: 500;
}
.solution-btn { align-self: flex-start; }

/* ===== 案例资源区域 ===== */
.case-section { background: var(--bg-white); }
.case-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; max-width: 900px; margin: 0 auto; }
.case-stat {
    text-align: center; padding: 32px 20px;
    background: linear-gradient(135deg, #F8FAFF 0%, #EEF2FF 100%);
    border-radius: var(--radius-lg); transition: all 0.4s ease;
}
.case-stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.case-num { font-size: 42px; font-weight: 800; margin-bottom: 8px; line-height: 1.1; }
.case-label { font-size: 15px; font-weight: 600; color: var(--text-secondary); }

/* ===== 全球覆盖区域 ===== */
.global-section { background: linear-gradient(180deg, #EEF2FF 0%, #F8FAFF 100%); }
.global-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.global-card {
    background: white; padding: 32px 28px; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); transition: all 0.4s ease; border-top: 3px solid var(--primary);
}
.global-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.global-title { font-size: 20px; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.global-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.global-stat { display: flex; flex-direction: column; gap: 4px; }
.gs-num {
    font-size: 22px; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.gs-label { font-size: 13px; color: var(--text-secondary); font-weight: 500; }

/* ===== 关于我们区域 ===== */
.about-section { background: var(--bg-white); }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 48px; align-items: start; }
.about-text p { font-size: 15px; color: var(--text-secondary); line-height: 1.9; margin-bottom: 20px; }
.about-text p:last-child { margin-bottom: 0; }
.about-cards { display: flex; flex-direction: column; gap: 16px; }
.about-card {
    padding: 24px; background: linear-gradient(135deg, #F8FAFF 0%, #EEF2FF 100%);
    border-radius: var(--radius-md); border-left: 3px solid var(--primary); transition: all 0.3s ease;
}
.about-card:hover { transform: translateX(6px); box-shadow: var(--shadow-sm); }
.about-num { font-size: 14px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.about-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--text-primary); }
.about-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.about-cta {
    text-align: center; padding: 40px; background: var(--gradient);
    border-radius: var(--radius-lg); color: white;
}
.about-cta p { font-size: 17px; margin-bottom: 24px; opacity: 0.95; }
.about-cta .btn { background: white; color: var(--primary); }
.about-cta .btn:hover { background: rgba(255,255,255,0.9); }

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(180deg, #1E1B4B 0%, #312E81 100%);
    color: rgba(255,255,255,0.8); padding: 70px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo .logo-text { color: white; -webkit-text-fill-color: white; }
.footer-desc { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 24px; line-height: 1.7; }
.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.contact-item { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 1.6; }
.contact-label { color: rgba(255,255,255,0.8); font-weight: 500; }
.footer-title { font-size: 16px; font-weight: 700; color: white; margin-bottom: 20px; }
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,0.6); transition: color 0.3s ease; }
.footer-links a:hover { color: white; }
.footer-bottom {
    padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1);
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.5); }
.footer-icp { display: flex; gap: 12px; font-size: 12px; color: rgba(255,255,255,0.4); flex-wrap: wrap; }

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed; bottom: 100px; right: 30px; width: 48px; height: 48px;
    background: var(--gradient); color: white; border: none; border-radius: 50%;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(124,58,237,0.3);
    opacity: 0; visibility: hidden; transform: translateY(20px);
    transition: all 0.3s ease; z-index: 998;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(124,58,237,0.4); }
.back-to-top svg { width: 20px; height: 20px; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .nav-menu { display: none; }
    .menu-toggle { display: flex; }
    .nav-menu.open {
        display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0;
        background: white; padding: 20px 24px; box-shadow: var(--shadow-md); gap: 16px;
    }
    .feature-cards, .service-cards, .tech-cards, .solution-cards, .home-news-grid { grid-template-columns: repeat(2, 1fr); }
    .concept-grid, .stats-grid, .case-stats { grid-template-columns: repeat(2, 1fr); }
    .global-grid { grid-template-columns: repeat(2, 1fr); }
    .source-dashboard { grid-template-columns: 1fr; }
    .about-content { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
    .section { padding: 60px 0; }
    .container { padding: 0 16px; }
    .feature-cards, .service-cards, .tech-cards, .solution-cards, .home-news-grid,
    .concept-grid, .stats-grid, .case-stats, .global-grid { grid-template-columns: 1fr; }
    .service-card-featured { transform: none; }
    .service-card-featured:hover { transform: translateY(-8px); }
    .source-list { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-buttons .btn { width: 100%; max-width: 280px; }
    .monitor-search { flex-direction: column; border-radius: var(--radius-md); }
    .search-btn { width: 100%; }
    .back-to-top { bottom: 80px; right: 20px; }
    .donut-chart { width: 260px; height: 260px; }
}

/* ===== 滚动动画 ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }