/* 全局字体：思源黑体 (免费商用) */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

body, h1, h2, h3, h4, h5, h6, p, a, span, div, input, button, textarea {
    font-family: 'Noto Sans SC', sans-serif !important;
}/* style.css */

/* --- 1. 核心变量：紫粉霓虹风格 --- */
:root {
    /* 背景色系：深紫到黑紫的渐变 */
    --bg-dark: #0f0518;
    --bg-card: rgba(40, 10, 60, 0.4);
    --bg-card-hover: rgba(60, 20, 90, 0.6);
    
    /* 品牌主色：亮紫 & 荧光粉 */
    --primary-purple: #d946ef; /* 亮紫 */
    --primary-pink: #f472b6;   /* 粉红 */
    --accent-cyan: #22d3ee;    /* 青色点缀 */
    
    /* 渐变定义 */
    --gradient-main: linear-gradient(135deg, var(--primary-purple), var(--primary-pink));
    --gradient-text: linear-gradient(90deg, #e879f9, #f472b6, #22d3ee);
    
    /* 边框与文字 */
    --border-glow: rgba(217, 70, 239, 0.3);
    --text-main: #ffffff;
    --text-sub: #e9d5ff; /* 淡紫灰 */
    --text-dim: #a78bfa;
    
    --font-stack: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; outline: none; }

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-stack);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* --- 2. 动态紫粉背景 --- */
.ambient-bg {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background: radial-gradient(circle at 50% 0%, #2e1065 0%, #0f0518 70%);
}
.glow-orb {
    position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.4;
    animation: floatOrb 15s infinite ease-in-out;
}
.orb-1 { width: 500px; height: 500px; background: var(--primary-purple); top: -10%; left: -10%; }
.orb-2 { width: 400px; height: 400px; background: var(--primary-pink); bottom: -10%; right: -10%; animation-delay: -5s; }
.orb-3 { width: 300px; height: 300px; background: var(--accent-cyan); top: 40%; left: 40%; opacity: 0.15; animation-delay: -10s; }

@keyframes floatOrb {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -50px) scale(1.1); }
}

/* --- 3. 通用布局 --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 100px 0; }

.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block; padding: 6px 16px;
    background: rgba(217, 70, 239, 0.15);
    color: var(--primary-purple);
    border: 1px solid var(--primary-purple);
    border-radius: 20px; font-size: 0.85rem; font-weight: 600;
    margin-bottom: 16px;
    box-shadow: 0 0 10px rgba(217, 70, 239, 0.2);
}
.section-title {
    font-size: 2.5rem; font-weight: 800; margin-bottom: 16px;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(217, 70, 239, 0.3);
}
.section-desc { font-size: 1.1rem; color: var(--text-sub); }

/* --- 4. 导航栏 --- */
header {
    position: fixed; top: 0; width: 100%; z-index: 1000;
    padding: 20px 0;
    background: rgba(15, 5, 24, 0.85);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(217, 70, 239, 0.2);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.logo {
    font-size: 1.5rem; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 32px; }
.nav-links a { color: var(--text-sub); font-weight: 500; }
.nav-links a:hover { color: var(--primary-pink); text-shadow: 0 0 10px var(--primary-pink); }

.btn-nav {
    padding: 10px 24px;
    background: var(--gradient-main);
    color: white; border-radius: 30px;
    font-weight: 600; cursor: pointer;
    box-shadow: 0 0 20px rgba(217, 70, 239, 0.4);
    border: none;
}
.btn-nav:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(244, 114, 182, 0.6); }

/* --- 5. Hero 区域 --- */
.hero { padding-top: 180px; padding-bottom: 100px; text-align: center; }
.hero h1 {
    font-size: 3.5rem; line-height: 1.2; font-weight: 800; margin-bottom: 24px;
}
.hero h1 span {
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { font-size: 1.25rem; color: var(--text-sub); max-width: 700px; margin: 0 auto 40px; }

.hero-btns { display: flex; justify-content: center; gap: 20px; }
.btn-primary {
    padding: 14px 36px; background: var(--gradient-main);
    color: white; border-radius: 8px; font-weight: 600; font-size: 1rem;
    border: none; cursor: pointer;
    box-shadow: 0 0 25px rgba(217, 70, 239, 0.5);
    transition: 0.3s;
}
.btn-secondary {
    padding: 14px 36px; background: transparent;
    color: var(--text-main); border: 1px solid var(--primary-purple);
    border-radius: 8px; font-weight: 600; font-size: 1rem;
    cursor: pointer;
    transition: 0.3s;
}
.btn-secondary:hover {
    background: rgba(217, 70, 239, 0.1);
    box-shadow: 0 0 15px rgba(217, 70, 239, 0.3);
    color: var(--primary-pink);
}

/* --- 6. 对比板块 --- */
.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 40px; }
.compare-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: 16px; padding: 40px;
    backdrop-filter: blur(10px);
}
.compare-card.bad { border-top: 3px solid #ff4d4f; box-shadow: 0 10px 30px rgba(255, 77, 79, 0.1); }
.compare-card.good { 
    border-top: 3px solid var(--primary-purple); 
    background: linear-gradient(180deg, rgba(217, 70, 239, 0.1) 0%, var(--bg-card) 100%);
    box-shadow: 0 10px 30px rgba(217, 70, 239, 0.15);
}
.compare-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; display: block; color: var(--text-main); }
.compare-list li {
    margin-bottom: 16px; padding-left: 28px; position: relative;
    color: var(--text-sub); font-size: 0.95rem;
}
.compare-list li::before {
    content: ''; position: absolute; left: 0; top: 8px; width: 6px; height: 6px; border-radius: 50%;
}
.bad .compare-list li::before { background: #ff4d4f; }
.good .compare-list li::before { background: var(--primary-pink); box-shadow: 0 0 8px var(--primary-pink); }

.comparison-summary {
    text-align: center; margin-top: 60px; padding: 40px;
    background: rgba(217, 70, 239, 0.05);
    border-radius: 16px; border: 1px solid var(--border-glow);
}
.summary-highlight { color: var(--primary-pink); font-weight: 700; font-size: 1.2rem; display: block; margin-bottom: 10px; }

/* --- 7. 数据趋势 --- */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
.stat-item {
    text-align: center; padding: 30px;
    background: var(--bg-card); border: 1px solid var(--border-glow);
    border-radius: 12px;
}
.stat-num {
    font-size: 3rem; font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    display: block; margin-bottom: 8px;
}
.stat-label { color: var(--text-sub); font-size: 0.9rem; }

/* --- 8. 核心功能 --- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: var(--bg-card); border: 1px solid var(--border-glow);
    padding: 32px; border-radius: 12px;
    transition: 0.3s; backdrop-filter: blur(5px);
}
.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-pink);
    background: var(--bg-card-hover);
    box-shadow: 0 10px 30px rgba(217, 70, 239, 0.2);
}
.feature-icon {
    font-size: 2rem; margin-bottom: 20px; display: inline-block;
    background: rgba(217, 70, 239, 0.15);
    padding: 12px; border-radius: 10px;
    color: var(--primary-pink);
}
.feature-card h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--text-main); }
.feature-card p { font-size: 0.9rem; color: var(--text-sub); }

/* --- 9. 什么是 GEO --- */
.geo-def-wrapper { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 60px; align-items: center; }
.geo-text h3 { font-size: 1.8rem; margin-bottom: 20px; color: var(--text-main); }
.geo-text p { color: var(--text-sub); margin-bottom: 20px; font-size: 1.05rem; }

.geo-demo {
    background: rgba(0,0,0,0.3); border: 1px solid var(--border-glow);
    border-radius: 16px; padding: 30px;
}
.demo-box {
    background: rgba(255,255,255,0.05); padding: 15px; border-radius: 8px;
    margin-bottom: 15px; font-size: 0.9rem;
}
.demo-q { color: var(--accent-cyan); border-left: 3px solid var(--accent-cyan); padding-left: 10px; }
.demo-a { color: var(--primary-pink); border-left: 3px solid var(--primary-pink); padding-left: 10px; }
.demo-note { font-size: 0.8rem; color: var(--text-dim); margin-top: 15px; text-align: center; }

/* --- 10. 页脚 --- */
footer {
    background: #05010a; border-top: 1px solid var(--border-glow);
    padding: 80px 0 40px; margin-top: 80px;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 60px; }
.footer-col h4 { color: var(--text-main); margin-bottom: 24px; font-size: 1.1rem; }
.footer-col p, .footer-col li { color: var(--text-sub); font-size: 0.9rem; margin-bottom: 12px; }
.copyright { text-align: center; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.05); color: var(--text-dim); font-size: 0.85rem; }

/* --- 11. 弹窗样式 (Modal) --- */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 2000;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.modal-overlay.active { display: flex; opacity: 1; }

.modal-content {
    background: linear-gradient(135deg, #1e1030, #0f0518);
    border: 2px solid var(--primary-purple);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 0 50px rgba(217, 70, 239, 0.4);
    transform: scale(0.8);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}
.modal-overlay.active .modal-content { transform: scale(1); }

.modal-close {
    position: absolute; top: 15px; right: 20px;
    font-size: 24px; color: var(--text-dim);
    cursor: pointer; transition: 0.3s;
}
.modal-close:hover { color: var(--primary-pink); }

.modal-img {
    width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}
.modal-title {
    font-size: 1.8rem;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
    font-weight: 800;
}
.modal-desc { color: var(--text-sub); font-size: 1rem; }

/* 响应式 */
@media (max-width: 992px) {
    .hero h1 { font-size: 2.8rem; }
    .comparison-grid, .stats-grid, .features-grid, .geo-def-wrapper, .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .nav-links { display: none; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 2.2rem; }
    .hero-btns { flex-direction: column; }
    .btn-primary, .btn-secondary { width: 100%; text-align: center; }
}