/* ====== 全局变量与配色规范 ====== */
:root {
    --c-sidebar-bg: #2b3643;
    --c-sidebar-glass: rgba(43, 54, 67, 0.85);
    --c-primary: #38bcae;
    --c-primary-hover: #2ba295;
    --c-blue: #409eff;
    --c-blue-hover: #66b1ff;
    --c-orange: #e6a23c;
    --c-bg-light: #f8fafc;
    --c-text-main: #2c3e50;
    --c-text-muted: #64748b;
    --c-border: #e2e8f0;
    --c-white: #ffffff;
    
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    color: var(--c-text-main);
    line-height: 1.6;
    background-color: var(--c-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ====== 毛玻璃悬浮导航栏 ====== */
.navbar {
    background-color: transparent;
    color: var(--c-white);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}
.navbar.scrolled {
    padding: 12px 0;
    background-color: var(--c-sidebar-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo 交互与样式 */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease;
}
.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, var(--c-primary), #20a092);
    color: var(--c-white);
    border-radius: 8px;
    font-weight: 800;
    font-style: italic;
    box-shadow: 0 4px 10px rgba(56, 188, 174, 0.3);
}

.nav-links { display: flex; gap: 32px; }
.nav-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}
.nav-links a:hover { color: var(--c-primary); }
.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--c-primary);
    transition: var(--transition);
}
.nav-links a:hover::after { width: 100%; }

/* ====== Hero 核心视觉区 ====== */
.hero {
    background-color: var(--c-sidebar-bg);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(56, 188, 174, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(64, 158, 255, 0.08) 0%, transparent 50%);
    color: var(--c-white);
    padding: 180px 0 110px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    font-size: 46px;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.hero .subtitle {
    font-size: 18px;
    color: #94a3b8;
    max-width: 820px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.icon { width: 18px; height: 18px; }

.btn-primary {
    background-color: var(--c-primary);
    color: var(--c-white);
    box-shadow: 0 4px 14px rgba(56, 188, 174, 0.4);
}
.btn-primary:hover {
    background-color: var(--c-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 188, 174, 0.5);
}

.btn-secondary {
    background-color: var(--c-blue);
    color: var(--c-white);
    box-shadow: 0 4px 14px rgba(64, 158, 255, 0.3);
}
.btn-secondary:hover {
    background-color: var(--c-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(64, 158, 255, 0.4);
}

.btn-outline {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--c-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-outline:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
    background-color: rgba(56, 188, 174, 0.05);
}

.hero-tags {
    font-size: 14px;
    color: #64748b;
    font-weight: 500;
}
.hero-tags .dot { margin: 0 12px; opacity: 0.5; }

/* ====== 通用排版与网格 ====== */
.section { padding: 110px 0; }
.bg-light { background-color: var(--c-bg-light); }

.section-header {
    text-align: center;
    margin-bottom: 70px;
}
.section-header h2 {
    font-size: 34px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--c-sidebar-bg);
}
.section-header p {
    font-size: 17px;
    color: var(--c-text-muted);
}

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; }
.align-center { align-items: center; }

/* ====== 特性卡片 ====== */
.card {
    background: var(--c-white);
    border-radius: 12px;
    padding: 44px 32px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: var(--transition);
    border: 1px solid var(--c-border);
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
    border-color: transparent;
}

.card-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}
.card-icon-wrapper svg { width: 28px; height: 28px; }

/* 纯正色彩提取 */
.teal { background: rgba(56, 188, 174, 0.1); color: var(--c-primary); }
.blue { background: rgba(64, 158, 255, 0.1); color: var(--c-blue); }
.orange { background: rgba(230, 162, 60, 0.1); color: var(--c-orange); }

.card h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--c-sidebar-bg);
}
.card p {
    color: var(--c-text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* ====== 列表说明区 ====== */
.feature-list li {
    margin-bottom: 32px;
    padding-left: 28px;
    position: relative;
    font-size: 16px;
    color: var(--c-text-muted);
    line-height: 1.7;
}
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 10px;
    height: 10px;
    background-color: var(--c-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(56, 188, 174, 0.2);
}
.feature-list strong {
    display: block;
    font-size: 19px;
    font-weight: 700;
    color: var(--c-sidebar-bg);
    margin-bottom: 8px;
}

/* ====== 微重力悬浮后台 UI 模拟 ====== */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-12px); }
    100% { transform: translateY(0px); }
}

.mockup-window {
    background: var(--c-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border: 1px solid var(--c-border);
    animation: float 7s ease-in-out infinite;
}
.mockup-header {
    background: #f1f5f9;
    height: 36px;
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 8px;
    border-bottom: 1px solid var(--c-border);
}
.mockup-header i { width: 12px; height: 12px; border-radius: 50%; }
.mockup-header i:nth-child(1) { background: #ff5f56; }
.mockup-header i:nth-child(2) { background: #ffbd2e; }
.mockup-header i:nth-child(3) { background: #27c93f; }

.mockup-body {
    display: flex;
    height: 340px;
    background: var(--c-bg-light);
}
.mock-sidebar {
    width: 24%;
    background: var(--c-sidebar-bg);
    padding: 20px 15px;
}
.mock-nav-item {
    height: 16px;
    border-radius: 4px;
    background: rgba(255,255,255,0.1);
    margin-bottom: 12px;
}
.mock-nav-item.active { background: var(--c-primary); width: 80%; }

.mock-content {
    flex: 1;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.mock-card {
    height: 80px;
    background: var(--c-white);
    border-radius: 6px;
    border-top: 3px solid var(--c-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    padding: 15px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 10px;
}
.mock-card-inner { height: 10px; background: #e2e8f0; border-radius: 4px; width: 40%; }
.mock-card-inner.short { width: 20%; background: var(--c-primary); opacity: 0.8;}

.mock-chart {
    flex: 1;
    background: var(--c-white);
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    position: relative;
    overflow: hidden;
}
.mock-line {
    position: absolute;
    bottom: 20px;
    left: -10%;
    width: 120%;
    height: 60%;
    border-top: 2px solid var(--c-primary);
    border-radius: 50% 50% 0 0;
    background: linear-gradient(to bottom, rgba(56, 188, 174, 0.1), transparent);
}

/* ====== Footer 与备案信息区 ====== */
.footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 50px 0 40px;
}
.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}
.footer-copyright {
    text-align: center;
    font-size: 15px;
}
.footer-sub {
    font-size: 13px;
    margin-top: 8px;
    opacity: 0.6;
}
.footer-beian {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: #64748b;
    flex-wrap: wrap;
    justify-content: center;
}
.beian-link {
    color: #64748b;
    transition: var(--transition);
}
.beian-link:hover {
    color: var(--c-primary);
}
.beian-divider {
    color: #475569;
    font-size: 12px;
}
.police-beian {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.police-icon {
    width: 16px;
    height: 16px;
}

/* ====== CSS 滚动加载动画 ====== */
.fade-in-up {
    opacity: 0;
    transform: translateY(25px);
    animation: fadeInUp 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to { opacity: 1; transform: translateY(0); }
}

.scroll-anim {
    opacity: 0;
    transform: translateY(35px);
    transition: all 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.scroll-anim.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ====== 响应式适配 ====== */
@media (max-width: 992px) {
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .hero h1 { font-size: 36px; }
    .mockup-window { margin-top: 20px; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .cta-group { flex-direction: column; gap: 16px; }
    .btn { width: 100%; }
    .hero { padding: 140px 0 80px; }
    .footer-beian { flex-direction: column; gap: 8px; }
    .beian-divider { display: none; }
}