/* 基础重置与变量 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #00a8ff;
    --primary-dark: #0097e6;
    --accent: #9c88ff;
    --success: #4cd137;
    --warning: #fbc531;
    --danger: #e84118;
    --dark: #1e272e;
    --dark-light: #2f3640;
    --light: #f5f6fa;
    --gray: #718093;
}
body {
    font-family: 'Exo 2', 'Segoe UI', sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

/* === 加载动画 === */
.loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--dark); display: flex; align-items: center; justify-content: center;
    z-index: 9999; transition: opacity 0.5s ease;
}
.loader-content { text-align: center; animation: pulse 1.5s infinite; }
.loader-icon { font-size: 4rem; color: var(--primary); margin-bottom: 1rem; }
.loader-text { color: #ccc; font-family: 'Courier New', monospace; font-size: 1.2rem; }
@keyframes pulse { 0%, 100% { opacity: 0.7; } 50% { opacity: 1; } }

/* === 导航栏 === */
.navbar {
    background: rgba(30, 39, 46, 0.95); backdrop-filter: blur(10px);
    position: fixed; width: 100%; top: 0; z-index: 1000;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(0, 168, 255, 0.1);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center;
}
.logo {
    display: flex; align-items: center; gap: 12px;
    font-size: 1.8rem; font-weight: 900; color: white;
    font-family: 'Orbitron', sans-serif;
}
.logo i { color: var(--primary); }
.nav-links { display: flex; gap: 2.5rem; }
.nav-link {
    color: #ccc; text-decoration: none; font-weight: 500; font-size: 1.05rem;
    padding: 0.5rem 0; position: relative; transition: color 0.3s;
}
.nav-link:hover, .nav-link.active { color: white; }
.nav-link.active::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0;
    height: 3px; background: var(--primary); border-radius: 3px;
}
.nav-toggle { display: none; background: none; border: none; color: white; font-size: 1.5rem; cursor: pointer; }

/* === 通用容器与标题 === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
section { padding: 6rem 0; }
.section-dark { background-color: var(--dark); color: white; }
.section-title {
    font-size: 2.8rem; text-align: center; margin-bottom: 1rem;
    color: inherit; font-weight: 800;
}
.section-subtitle {
    text-align: center; color: var(--gray); margin-bottom: 4rem;
    font-size: 1.2rem; line-height: 1.7; max-width: 800px; margin-left: auto; margin-right: auto;
}

/* === 主页横幅 (Hero) === */
.hero {
    padding-top: 8rem; background: linear-gradient(135deg, #0a1929 0%, #1a2c42 100%);
    color: white; position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; right: -20%;
    width: 800px; height: 800px; background: radial-gradient(circle, rgba(0, 168, 255, 0.1) 0%, transparent 70%);
}
.hero-content { text-align: center; max-width: 950px; margin: 0 auto; position: relative; z-index: 2; }
.hero-brand {
    font-size: 4.5rem; font-weight: 900; background: linear-gradient(to right, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    display: block; line-height: 1.1; margin-bottom: 0.5rem;
    font-family: 'Orbitron', sans-serif;
}
.hero-tagline {
    font-size: 1.8rem; color: #a0c4ff; margin-bottom: 2rem;
    font-weight: 300;
}
.hero-desc {
    font-size: 1.3rem; color: #b0d0ff; margin-bottom: 3.5rem;
    line-height: 1.8;
}
.hero-stats {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 4rem;
    margin-bottom: 4rem;
}
.stat { text-align: center; max-width: 250px; }
.stat-number {
    font-size: 3.5rem; font-weight: 900; color: var(--primary);
    font-family: 'Orbitron', sans-serif; margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(0, 168, 255, 0.3);
    transition: color 0.3s ease;
}
.stat-label { 
    color: #a0c4ff; font-size: 1.1rem; 
    margin-bottom: 0.5rem;
}
.stat-note {
    color: #8899cc; font-size: 0.9rem;
    line-height: 1.4;
}
.hero-cta { display: flex; gap: 1.5rem; justify-content: center; flex-wrap: wrap; }
.btn {
    padding: 1.1rem 2.5rem; border-radius: 50px; text-decoration: none;
    font-weight: 700; display: inline-flex; align-items: center; gap: 12px;
    transition: all 0.3s ease; font-size: 1.1rem;
}
.btn-primary {
    background: linear-gradient(45deg, var(--primary), var(--accent));
    color: white; box-shadow: 0 10px 25px rgba(0, 168, 255, 0.4);
}
.btn-primary:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0, 168, 255, 0.6); }
.btn-secondary {
    background: rgba(255, 255, 255, 0.1); backdrop-filter: blur(10px);
    color: white; border: 2px solid rgba(255, 255, 255, 0.3);
}
.btn-secondary:hover { background: rgba(255, 255, 255, 0.2); border-color: var(--primary); transform: translateY(-5px); }

/* === 核心服务 === */
.services-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem; margin-top: 2rem;
}
.service-card {
    background: rgba(255, 255, 255, 0.05); backdrop-filter: blur(10px);
    border-radius: 20px; padding: 2.5rem; border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.4s ease;
}
/* 悬停效果由JS实现，这里只保留非transform属性 */
.service-card:hover {
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}
.service-icon {
    width: 90px; height: 90px; border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 2rem; font-size: 2.8rem;
}
.service-card h3 {
    font-size: 1.8rem; margin-bottom: 1.2rem; color: white;
    font-weight: 700;
}
.service-card p { color: #b0b0b0; margin-bottom: 1.8rem; line-height: 1.7; }
.service-feature-list { list-style: none; }
.service-feature-list li {
    padding: 0.7rem 0; color: #d0d0d0; display: flex; align-items: center; gap: 12px;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}
.service-feature-list li:last-child { border-bottom: none; }
.service-feature-list i { color: var(--success); font-size: 1rem; }

/* === 核心优势 === */
.why-us { background: linear-gradient(to bottom, #f8f9fa 0%, #e9ecef 100%); }
.advantages-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem; margin-top: 3rem;
}
.advantage-card {
    background: white; border-radius: 20px; padding: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.05);
    border-left: 5px solid var(--primary); position: relative;
    transition: all 0.3s ease;
}
/* 悬停效果由JS实现，CSS不设transform */
.advantage-card:hover {
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.1);
}
.advantage-number {
    position: absolute; top: -20px; left: 30px;
    font-size: 5rem; font-weight: 900; color: rgba(0, 168, 255, 0.1);
    font-family: 'Orbitron', sans-serif; line-height: 1;
}
.advantage-card h3 {
    font-size: 1.6rem; margin-bottom: 1.2rem; color: var(--dark);
    display: flex; align-items: center; gap: 12px;
}
.advantage-card h3 i { color: var(--primary); }
.advantage-card p { color: var(--gray); margin-bottom: 1.5rem; line-height: 1.7; }
.advantage-highlight {
    padding: 1rem; background: rgba(0, 168, 255, 0.08);
    border-radius: 10px; color: var(--primary-dark);
    font-weight: 600; font-size: 0.95rem; border-left: 3px solid var(--primary);
}

/* 成本对比小盒子 */
.cost-comparison-box {
    background: rgba(0, 168, 255, 0.05);
    border-radius: 10px; padding: 1.2rem;
    margin: 1.5rem 0; border: 1px dashed rgba(0, 168, 255, 0.3);
}
.comparison-row {
    display: flex; justify-content: space-between;
    padding: 0.5rem 0; border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.comparison-row:last-child { border-bottom: none; }
.comp-label { font-weight: 600; color: var(--dark); }
.comp-value { font-weight: 700; }

/* 成本对比分析卡片 */
.cost-analysis-card {
    background: white; border-radius: 20px; padding: 2.5rem;
    margin-top: 4rem; box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    border: 1px solid #e9ecef; grid-column: 1 / -1;
    transition: all 0.3s ease;
}
.cost-analysis-card:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.cost-analysis-card h4 {
    font-size: 1.8rem; color: var(--dark); margin-bottom: 1.5rem;
    display: flex; align-items: center; gap: 10px;
}
.cost-analysis-card h4 i { color: var(--primary); }
.cost-analysis-card > p {
    color: var(--gray); margin-bottom: 2rem; line-height: 1.7;
}

/* 分析表格 */
.analysis-table {
    border-radius: 15px; overflow: hidden;
    border: 1px solid #e9ecef; margin-bottom: 2rem;
}
.table-header {
    display: grid; grid-template-columns: 2fr 1fr 1.5fr 1.5fr 1.5fr;
    background: var(--dark); color: white; padding: 1.2rem 1.5rem;
    font-weight: 700; text-align: center;
}
.table-row {
    display: grid; grid-template-columns: 2fr 1fr 1.5fr 1.5fr 1.5fr;
    padding: 1.2rem 1.5rem; text-align: center;
    border-bottom: 1px solid #e9ecef;
}
.table-row:last-child { border-bottom: none; }
.table-row.bad {
    background: rgba(232, 65, 24, 0.05);
    border-left: 4px solid var(--danger);
}
.table-row.good {
    background: rgba(76, 209, 55, 0.05);
    border-left: 4px solid var(--success);
}
.table-row.vs-row {
    background: rgba(0, 168, 255, 0.05);
    padding: 0.8rem; text-align: center;
}
.vs-text {
    font-weight: 900; color: var(--primary); font-size: 1.5rem;
    font-family: 'Orbitron', sans-serif;
}
.table-col { padding: 0.3rem; }

/* 分析结论 */
.analysis-conclusion {
    background: rgba(0, 168, 255, 0.05);
    border-radius: 15px; padding: 1.8rem;
    border-left: 4px solid var(--primary);
}
.analysis-conclusion h5 {
    font-size: 1.3rem; color: var(--dark); margin-bottom: 1rem;
    display: flex; align-items: center; gap: 10px;
}
.analysis-conclusion h5 i { color: var(--warning); }
.analysis-conclusion p {
    margin-bottom: 1rem; color: var(--gray); line-height: 1.7;
}

/* 数据计算器组件样式 */
.calculation-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px; padding: 2.5rem; margin-top: 4rem;
    border: 1px solid #e9ecef; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
    grid-column: 1 / -1;
    transition: all 0.3s ease;
}
.calculation-card:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.calculation-card h4 {
    font-size: 1.8rem; color: var(--dark); margin-bottom: 1.5rem;
    display: flex; align-items: center; gap: 10px;
}
.calculation-card h4 i { color: var(--primary); }
.calculation-card > p {
    color: var(--gray); margin-bottom: 2rem; line-height: 1.7;
}
.calc-steps {
    display: flex; flex-wrap: wrap; justify-content: center; align-items: center;
    gap: 1rem; margin: 2.5rem 0; padding: 1.5rem;
    background: rgba(0, 168, 255, 0.03); border-radius: 15px;
    border: 1px dashed rgba(0, 168, 255, 0.2);
}
.calc-steps .step, .calc-steps .step-result {
    padding: 0.8rem 1.5rem; background: white; border-radius: 10px;
    font-weight: 700; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    text-align: center; min-width: 120px;
}
.calc-steps .step {
    color: var(--dark); font-size: 1.8rem; font-family: 'Orbitron', sans-serif;
}
.calc-steps .step span {
    display: block; font-size: 0.85rem; color: var(--gray);
    font-weight: normal; margin-top: 0.5rem; font-family: 'Exo 2', sans-serif;
}
.calc-steps .step-result {
    background: linear-gradient(45deg, var(--primary), var(--accent));
    color: white; font-size: 2rem;
}
.calc-steps .step-operator {
    font-size: 1.8rem; color: var(--primary); font-weight: bold;
}
.calc-note {
    font-size: 0.95rem; color: #6c8a9a; padding: 1.2rem;
    background: rgba(0, 168, 255, 0.05); border-radius: 10px;
    border-left: 4px solid var(--warning);
    display: flex; align-items: flex-start; gap: 12px;
}
.calc-note i { color: var(--warning); flex-shrink: 0; margin-top: 0.2rem; }

/* === 服务定价 === */
.pricing-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem; margin-top: 3rem;
}
.pricing-card {
    background: rgba(255, 255, 255, 0.05); border-radius: 20px; overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1); position: relative;
    transition: all 0.4s ease;
}
.card-featured {
    border: 2px solid var(--primary); transform: scale(1.05);
    box-shadow: 0 20px 50px rgba(0, 168, 255, 0.15);
}
.popular-tag {
    position: absolute; top: 20px; right: -35px;
    background: var(--primary); color: white; padding: 0.5rem 2.5rem;
    font-size: 0.9rem; font-weight: 700; transform: rotate(45deg);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}
.pricing-header {
    padding: 2.5rem 2.5rem 1.5rem; text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.pricing-header h3 {
    font-size: 2rem; color: white; margin-bottom: 1.5rem;
}
.price {
    font-size: 3.2rem; font-weight: 900; color: white; margin-bottom: 0.8rem;
    font-family: 'Orbitron', sans-serif;
}
.currency { font-size: 2rem; vertical-align: top; color: var(--primary); }
.period { font-size: 1.2rem; color: #aaa; font-weight: normal; }
.price-usdt {
    color: #aaa; font-size: 1rem;
}
.amount-usdt { color: var(--success); font-weight: 700; }
.pricing-body {
    padding: 2rem 2.5rem;
}
.pricing-body ul { list-style: none; margin-bottom: 2rem; }
.pricing-body li {
    padding: 0.9rem 0; border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    color: #d0d0d0; font-size: 1.05rem;
}
.pricing-body li:last-child { border-bottom: none; }
.pricing-body strong { color: white; }
.pricing-note {
    font-size: 1rem; color: var(--primary); text-align: center; font-weight: 600;
    padding: 1rem; background: rgba(0, 168, 255, 0.1); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; gap: 10px;
}
.btn-pricing {
    display: block; margin: 0 2.5rem 2.5rem; padding: 1.2rem;
    background: linear-gradient(45deg, var(--primary), var(--accent));
    color: white; text-align: center; text-decoration: none;
    border-radius: 12px; font-weight: 700; font-size: 1.1rem;
    transition: all 0.3s ease; box-shadow: 0 5px 15px rgba(0, 168, 255, 0.3);
}
.btn-pricing:hover { transform: translateY(-3px); box-shadow: 0 10px 25px rgba(0, 168, 255, 0.5); }

/* USDT付款汇率说明样式 */
.exchange-rate-notice {
    background: rgba(0, 168, 255, 0.08);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem auto 0;
    max-width: 800px;
    border-left: 4px solid var(--primary);
}
.exchange-rate-notice p {
    color: #d0e6ff;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin: 0;
    font-size: 1.05rem;
    line-height: 1.6;
}
.exchange-rate-notice i {
    color: var(--primary);
    margin-top: 0.2rem;
    flex-shrink: 0;
}
.exchange-rate-notice .exchange-rate {
    color: var(--success);
    font-weight: 700;
    background: rgba(76, 209, 55, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 5px;
    border: 1px solid rgba(76, 209, 55, 0.3);
}

.discount-notes {
    margin-top: 3rem; padding: 2rem; background: rgba(255, 255, 255, 0.05);
    border-radius: 15px; border-left: 4px solid var(--primary);
}
.discount-notes p {
    margin-bottom: 1rem; display: flex; align-items: flex-start; gap: 15px;
    font-size: 1.05rem; line-height: 1.7;
}
.discount-notes i { color: var(--primary); margin-top: 0.3rem; flex-shrink: 0; }

/* === 联系我们 === */
.contact-content {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 4rem; margin-top: 3rem; align-items: start;
}
.contact-info h3, .contact-cta h3 {
    font-size: 2rem; margin-bottom: 1.5rem; color: var(--dark);
}
.contact-info p, .contact-cta p { color: var(--gray); margin-bottom: 2rem; line-height: 1.7; }
.contact-method {
    display: flex; gap: 1.5rem; margin-bottom: 2rem; align-items: center;
}
.method-icon {
    width: 60px; height: 60px; background: rgba(0, 168, 255, 0.1);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.method-icon i { font-size: 1.5rem; color: var(--primary); }
.method-detail h4 { margin-bottom: 0.5rem; color: var(--dark); }
.telegram-link {
    color: var(--primary); text-decoration: none; font-weight: 600; font-size: 1.2rem;
    display: inline-flex; align-items: center; gap: 8px;
}
.telegram-link:hover { text-decoration: underline; }
.contact-tip {
    padding: 1.2rem; background: rgba(0, 168, 255, 0.08);
    border-radius: 12px; margin-top: 2.5rem; color: var(--primary-dark);
    font-weight: 600; display: flex; align-items: center; gap: 12px;
}
.contact-cta {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px; padding: 2.5rem; border: 1px solid #ddd;
}
.btn-large { padding: 1.3rem 3rem; font-size: 1.2rem; width: 100%; justify-content: center; }
.cta-note {
    margin-top: 1.5rem; padding: 1rem;
    background: rgba(0, 168, 255, 0.08); border-radius: 10px;
    color: var(--dark); font-size: 0.95rem;
    display: flex; align-items: center; gap: 10px;
}

/* === 页脚 === */
.footer {
    background: var(--dark-light); color: #ccc; padding: 4rem 0 3rem;
    text-align: center; border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-logo {
    font-size: 2.2rem; font-weight: 900; margin-bottom: 1rem;
    display: flex; align-items: center; justify-content: center; gap: 12px;
    font-family: 'Orbitron', sans-serif; color: white;
}
.footer-tagline {
    color: #aaa; margin-bottom: 2rem; font-size: 1.2rem;
    max-width: 600px; margin-left: auto; margin-right: auto;
}
.footer-links a {
    color: #ccc; text-decoration: none; margin: 0 1rem;
    transition: color 0.3s; font-weight: 500;
}
.footer-links a:hover { color: var(--primary); }
.footer-copyright {
    margin-top: 3rem; color: #777; font-size: 0.9rem;
    padding-top: 2rem; border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* === 响应式设计 === */
@media (max-width: 992px) {
    .section-title { font-size: 2.4rem; }
    .hero-brand { font-size: 3.8rem; }
    .card-featured { transform: none; margin-top: 1rem; }
    .calc-steps .step, .calc-steps .step-result { min-width: 100px; }
    .table-header, .table-row {
        grid-template-columns: 1.5fr 1fr 1.2fr 1.2fr 1.2fr;
    }
}
@media (max-width: 768px) {
    .nav-links {
        display: none; position: absolute; top: 100%; left: 0;
        width: 100%; background: var(--dark); flex-direction: column;
        padding: 1.5rem; box-shadow: 0 10px 20px rgba(0,0,0,0.3);
        gap: 1.5rem;
    }
    .nav-links.active { display: flex; }
    .nav-toggle { display: block; }
    .hero { padding-top: 7rem; }
    .hero-brand { font-size: 3rem; }
    .hero-tagline { font-size: 1.5rem; }
    .hero-stats { gap: 2.5rem; }
    .hero-cta, .advantages-grid, .pricing-grid { grid-template-columns: 1fr; }
    .btn, .btn-pricing { width: 100%; justify-content: center; }
    .contact-content { grid-template-columns: 1fr; }
    .footer-links a { display: block; margin: 0.5rem 0; }
    .calc-steps { flex-direction: column; align-items: stretch; }
    .calc-steps .step, .calc-steps .step-result { min-width: auto; }
    .calc-steps .step-operator { transform: rotate(90deg); padding: 1rem 0; }
    .table-header, .table-row {
        grid-template-columns: 1fr; gap: 0.5rem;
        text-align: left; padding: 1rem;
    }
    .table-header .table-col:not(:first-child)::before {
        content: attr(data-label); font-weight: 600;
        display: block; color: #666; font-size: 0.9rem;
        margin-bottom: 0.3rem;
    }
    .table-header .table-col { display: none; }
    .table-row .table-col:not(:first-child)::before {
        content: attr(data-label); font-weight: 600;
        display: block; color: #666; font-size: 0.9rem;
        margin-bottom: 0.3rem;
    }
    .table-row { 
        grid-template-columns: 1fr; 
        border-bottom: 2px solid #e9ecef;
    }
    .exchange-rate-notice p {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}
@media (max-width: 480px) {
    .container { padding: 0 1.5rem; }
    .section-title { font-size: 2rem; }
    .hero-brand { font-size: 2.5rem; }
    .stat-number { font-size: 2.8rem; }
    .price { font-size: 2.8rem; }
    .advantage-card, .calculation-card, .cost-analysis-card { padding: 1.8rem; }
    .exchange-rate-notice { padding: 1.2rem; }
    .hero-desc { font-size: 1rem; }
    .btn { padding: 0.8rem 1.5rem; font-size: 1rem; }
    .cost-analysis-card ul li { font-size: 0.9rem; word-break: break-word; }
    .cost-analysis-card ul li strong { display: inline-block; white-space: nowrap; }
    .calc-steps .step, .calc-steps .step-result { font-size: 1.2rem; padding: 0.5rem; }
}