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

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background: #ffffff;
    color: #0a2540;
    line-height: 1.5;
    scroll-behavior: smooth;
}

/* 蓝白氛围光效 */
.bg-glow {
    position: fixed;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.08), rgba(37,99,235,0) 70%);
    border-radius: 50%;
    z-index: -1;
    pointer-events: none;
}

.bg-glow-left {
    left: -15%;
    top: 40%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37,99,235,0.06), transparent 70%);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(59,130,246,0.15);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 14px 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    line-height: 0;
}

.logo img {
    height: 44px;
    width: auto;
    display: block;
    transition: opacity 0.2s;
}

.logo img:hover {
    opacity: 0.9;
}

.nav-links {
    display: flex;
    gap: 36px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    color: #1e4a76;
    transition: all 0.2s;
    position: relative;
}

.nav-links a:hover {
    color: #2563eb;
}

.nav-links a[href="#system-intro"] {
    color: #2563eb;
    font-weight: 600;
}

/* Hero区 */
.hero {
    padding: 80px 0 56px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: #eef2ff;
    padding: 6px 16px;
    border-radius: 60px;
    color: #2563eb;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 28px;
    backdrop-filter: blur(4px);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(145deg, #0b2b44, #1e4a76);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: #3b5d8c;
    max-width: 680px;
    margin: 0 auto;
}

/* 下载按钮组（仅保留单个按钮） */
.download-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px;
    margin-top: 40px;
}

.btn-download {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.25s ease;
    text-align: center;
    cursor: pointer;
    border: none;
    background: #2563eb;
    color: white;
    box-shadow: 0 8px 18px -6px rgba(37,99,235,0.3);
    letter-spacing: 0.3px;
}

.btn-download:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 14px 24px -8px rgba(37,99,235,0.4);
}

.download-tip {
    margin-top: 20px;
    font-size: 0.75rem;
    color: #6c8eae;
    text-align: center;
}

/* 系统介绍板块 */
.intro-section {
    padding: 48px 0 90px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    background: linear-gradient(145deg, #1e3a5f, #2563eb);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.section-sub {
    text-align: center;
    color: #4a6a8e;
    font-size: 1.1rem;
    max-width: 640px;
    margin: 0 auto 56px;
    line-height: 1.5;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(2px);
    border: 1px solid #e2edff;
    border-radius: 36px;
    padding: 32px 28px;
    transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
    box-shadow: 0 12px 28px -12px rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: #3b82f6;
    box-shadow: 0 24px 40px -14px rgba(37, 99, 235, 0.12);
    background: #ffffff;
}

.feature-icon {
    font-size: 2.6rem;
    margin-bottom: 24px;
    background: #f0f7ff;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 24px;
    box-shadow: 0 6px 12px -6px rgba(0, 0, 0, 0.04);
    color: #2563eb;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: #0f2b3f;
}

.feature-card p {
    color: #4a6a8a;
    line-height: 1.5;
}

.flow-section {
    background: #f5faff;
    border-radius: 56px;
    padding: 56px 40px;
    margin-top: 32px;
    border: 1px solid #d9ebff;
}

.flow-title {
    text-align: center;
    font-size: 1.9rem;
    font-weight: 600;
    margin-bottom: 48px;
    color: #0e3a5c;
}

.steps-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
}

.step-item {
    flex: 1;
    min-width: 180px;
    text-align: center;
    background: white;
    padding: 24px 16px;
    border-radius: 48px;
    transition: all 0.2s;
    box-shadow: 0 8px 20px rgba(0,0,0,0.02);
    border: 1px solid #e2f0ff;
}

.step-number {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: white;
    font-weight: 700;
    font-size: 1.5rem;
    border-radius: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow: 0 10px 18px -6px #3b82f680;
}

.step-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #1e4a76;
}

.step-item p {
    color: #5a7a9a;
    font-size: 0.9rem;
}

.double-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    margin: 56px 0 40px;
}

.panel {
    flex: 1;
    background: #ffffff;
    border-radius: 44px;
    padding: 38px 28px;
    border: 1px solid #e6f0ff;
    transition: 0.25s;
    box-shadow: 0 15px 30px -12px rgba(0, 0, 0, 0.04);
}

.panel:hover {
    transform: scale(1.01);
    border-color: #90cdf4;
}

.panel-title {
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #1e3a5f;
}

.panel-title span {
    background: #eef4ff;
    color: #2563eb;
    padding: 8px 12px;
    border-radius: 60px;
    font-size: 1rem;
}

.panel-list {
    list-style: none;
}

.panel-list li {
    margin: 16px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #2c4c73;
}

.panel-list li::before {
    content: "✦";
    color: #3b82f6;
    font-weight: bold;
}

.footer {
    border-top: 1px solid #e2edff;
    padding: 48px 0 36px;
    background: #ffffff;
    text-align: center;
    margin-top: 20px;
}

.footer p {
    color: #5a7a9e;
    font-size: 0.85rem;
    margin: 8px 0;
}

.footer a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.tech-badge {
    background: #eef4ff;
    border-radius: 60px;
    padding: 8px 24px;
    font-size: 0.9rem;
    color: #1e4a76;
}

@media (max-width: 800px) {
    .container {
        padding: 0 24px;
    }
    .hero h1 {
        font-size: 2.3rem;
    }
    .nav-inner {
        flex-direction: column;
    }
    .section-title {
        font-size: 1.9rem;
    }
    .flow-section {
        padding: 36px 20px;
    }
    .logo img {
        height: 36px;
    }
    .btn-download {
        padding: 10px 28px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 24px;
    }
    .download-group {
        gap: 16px;
    }
}