:root {
    --hub-bg: #090d16;
    --hub-card: #131b2e;
    --hub-card-hover: #1c2842;
    --hub-primary: #fcd535; 
    --hub-secondary: #00d2ff;
    --hub-text: #f0f3f8;
    --hub-gray: #94a3b8;
    --hub-border: #1e293b;
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--hub-bg);
    color: var(--hub-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

/* 顶部通知栏 */
.top-banner {
    background: linear-gradient(90deg, rgba(0,210,255,0.1), rgba(252,213,53,0.1));
    border-bottom: 1px solid var(--hub-border);
    text-align: center;
    padding: 10px 15px;
    font-size: 0.88rem;
    color: var(--hub-gray);
}
.top-banner span { color: var(--hub-primary); font-weight: bold; }

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(9, 13, 22, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--hub-border);
    z-index: 1000;
    padding: 18px 0;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: bold;
    font-size: 1.3rem;
    color: #fff;
    transition: var(--transition);
}
.nav-logo:hover { transform: scale(1.02); }
.nav-logo i { color: var(--hub-primary); font-size: 1.6rem; }
.nav-menu { display: flex; gap: 30px; }
.nav-menu a { color: var(--hub-gray); font-size: 0.95rem; font-weight: 500; transition: var(--transition); }
.nav-menu a:hover { color: var(--hub-primary); text-shadow: 0 0 10px rgba(252,213,53,0.4); }

/* Hero 首屏 */
.hero-section {
    padding: 90px 0 60px;
    text-align: center;
    position: relative;
    background: radial-gradient(circle at 50% 10%, rgba(0,210,255,0.06) 0%, transparent 60%);
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(252,213,53,0.08);
    border: 1px solid rgba(252,213,53,0.2);
    border-radius: 20px;
    color: var(--hub-primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
    animation: pulseGlow 3s infinite;
}
.hero-section h1 {
    font-size: 3.2rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: #fff;
    letter-spacing: -0.5px;
    line-height: 1.25;
}
.hero-section p {
    font-size: 1.2rem;
    color: var(--hub-gray);
    max-width: 750px;
    margin: 0 auto 50px;
}

/* 双所分流卡片对比区（含动态悬浮特效） */
.exchange-split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 35px;
    margin-bottom: 80px;
}
.exchange-card {
    background: var(--hub-card);
    border: 1px solid var(--hub-border);
    border-radius: 20px;
    padding: 45px 35px;
    text-align: left;
    position: relative;
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.exchange-card:hover {
    transform: translateY(-8px);
    border-color: var(--hub-primary);
    box-shadow: 0 20px 40px rgba(252,213,53,0.12);
}
.exchange-card.platform-one-theme { border-top: 5px solid var(--hub-secondary); }
.exchange-card.platform-two-theme { border-top: 5px solid var(--hub-primary); }

.exchange-header {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 25px;
}
.platform-logo-img {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
.exchange-header h3 { font-size: 1.5rem; color: #fff; margin-bottom: 4px; }
.platform-sub { font-size: 0.85rem; color: var(--hub-gray); }

.exchange-perks {
    margin-bottom: 35px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    color: var(--hub-gray);
    font-size: 0.98rem;
}
.exchange-perks li i { color: #10b981; margin-right: 10px; font-size: 1.1rem; }
.exchange-actions { display: flex; gap: 15px; }

/* 按钮动态悬浮与发光 */
.btn {
    padding: 12px 22px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
}
.btn-primary-custom {
    background: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(0,210,255,0.3);
}
.btn-primary-custom:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,210,255,0.5);
}
.btn-secondary-custom {
    background: linear-gradient(135deg, #fcd535 0%, #f0b90b 100%);
    color: #0f141c;
    box-shadow: 0 4px 15px rgba(252,213,53,0.3);
}
.btn-secondary-custom:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(252,213,53,0.5);
}
.btn-outline-custom {
    border: 1px solid var(--hub-border);
    color: #fff;
    background: rgba(255,255,255,0.02);
}
.btn-outline-custom:hover {
    border-color: var(--hub-primary);
    color: var(--hub-primary);
    background: rgba(252,213,53,0.05);
    transform: translateY(-3px);
}

/* 核心优势卡片区块 */
.features-section {
    padding: 70px 0;
    background: rgba(19, 27, 46, 0.4);
    border-top: 1px solid var(--hub-border);
    border-bottom: 1px solid var(--hub-border);
}
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 2.3rem; color: #fff; margin-bottom: 12px; font-weight: 700; }
.section-title p { color: var(--hub-gray); font-size: 1.05rem; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.feature-box {
    background: var(--hub-card);
    border: 1px solid var(--hub-border);
    border-radius: 16px;
    padding: 35px 30px;
    transition: var(--transition);
}
.feature-box:hover {
    transform: translateY(-6px);
    border-color: var(--hub-secondary);
    box-shadow: 0 15px 30px rgba(0,210,255,0.1);
}
.feature-icon {
    font-size: 2.2rem;
    color: var(--hub-secondary);
    margin-bottom: 20px;
}
.feature-box h3 { font-size: 1.25rem; color: #fff; margin-bottom: 12px; }
.feature-box p { color: var(--hub-gray); font-size: 0.95rem; }

/* 交易实用小工具区 */
.tools-section { padding: 80px 0; }
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}
.tool-box {
    background: var(--hub-card);
    border: 1px solid var(--hub-border);
    border-radius: 16px;
    padding: 35px;
    transition: var(--transition);
}
.tool-box:hover {
    transform: translateY(-5px);
    border-color: var(--hub-primary);
}
.tool-box h4 { margin-bottom: 20px; color: #fff; font-size: 1.2rem; display: flex; align-items: center; gap: 10px; }
.tool-box h4 i { color: var(--hub-primary); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; color: var(--hub-gray); margin-bottom: 8px; }
.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--hub-bg);
    border: 1px solid var(--hub-border);
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    transition: var(--transition);
}
.form-control:focus { border-color: var(--hub-primary); outline: none; box-shadow: 0 0 10px rgba(252,213,53,0.2); }
.tool-output {
    margin-top: 20px;
    padding: 14px;
    background: var(--hub-bg);
    border-radius: 8px;
    color: var(--hub-primary);
    font-weight: bold;
    text-align: center;
    font-size: 1.05rem;
    border: 1px dashed var(--hub-border);
}

/* 教程与下载中心 */
.guide-section {
    padding: 80px 0;
    background: rgba(19, 27, 46, 0.4);
    border-top: 1px solid var(--hub-border);
}
.guide-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.guide-card {
    background: var(--hub-card);
    border: 1px solid var(--hub-border);
    border-radius: 16px;
    padding: 35px;
    transition: var(--transition);
}
.guide-card:hover {
    transform: translateY(-6px);
    border-color: var(--hub-primary);
    box-shadow: 0 15px 30px rgba(252,213,53,0.1);
}
.guide-card h3 { font-size: 1.25rem; color: #fff; margin-bottom: 12px; }
.guide-card p { color: var(--hub-gray); font-size: 0.95rem; margin-bottom: 20px; }
.guide-link {
    color: var(--hub-primary);
    font-size: 0.95rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.guide-link:hover { gap: 10px; color: #fff; }

/* 页脚 */
.footer {
    background: var(--hub-bg);
    border-top: 1px solid var(--hub-border);
    padding: 50px 0;
    text-align: center;
    color: var(--hub-gray);
    font-size: 0.9rem;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(252, 213, 53, 0.2); }
    70% { box-shadow: 0 0 0 10px rgba(252, 213, 53, 0); }
    100% { box-shadow: 0 0 0 0 rgba(252, 213, 53, 0); }
}

/* 响应式适配 */
@media (max-width: 992px) {
    .exchange-split-grid, .tools-grid, .guide-grid, .features-grid { grid-template-columns: 1fr; }
    .hero-section h1 { font-size: 2.3rem; }
}