/* ===== 闪连VPN公共样式 - CSS变量 + 基础组件 ===== */
:root {
    --color-primary: #ff8e15;
    --color-primary-hover: #ff9a2e;
    --color-primary-shadow: rgba(255,142,21,0.4);
    --color-primary-shadow-light: rgba(255,154,46,0.2);
    --color-primary-shadow-soft: rgba(255,154,46,0.15);
    --color-dark: #262626;
    --color-muted: #5b626b;
    --color-gray: #9b9b9b;
    --color-border: #e0e0e0;
    --color-bg-alt: #f5f7fb;
    --color-bg-white: #ffffff;
    --color-success: #00be3f;
    --color-footer-bg: #262626;
    --color-footer-border: rgba(255,255,255,0.1);
    --color-shadow-card: rgba(219,235,243,0.5);
    --color-node-border: #dbebf3;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    --radius-sm: 10px;
    --radius-md: 15px;
    --radius-lg: 20px;
    --radius-btn: 25px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-family);
    color: var(--color-dark);
    background: var(--color-bg-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

/* Skip-link 无障碍导航 */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 8px 16px;
    z-index: 999;
    font-size: 14px;
    font-weight: 600;
    transition: top .2s;
}
.skip-link:focus { top: 0; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    max-width: 1140px;
    margin: 0 auto;
}
.logo-link { display: flex; align-items: center; gap: 8px; }
.logo-link img { height: 40px; width: auto; display: block; }
.logo-text { font-size: 18px; font-weight: 700; color: var(--color-dark); }

/* Navigation */
.nav-list { display: flex; list-style: none; gap: 24px; align-items: center; }
.nav-list a { font-size: 15px; font-weight: 500; color: var(--color-dark); transition: color .3s; }
.nav-list a:hover { color: var(--color-primary); }
.nav-list a.active { color: var(--color-primary); font-weight: 700; }

.nav-cta { display: flex; gap: 12px; align-items: center; }

/* Buttons */
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    padding: 10px 24px;
    border-radius: var(--radius-btn);
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background .3s, box-shadow .3s;
    text-align: center;
    display: inline-block;
}
.btn-primary:hover { background: var(--color-primary-hover); box-shadow: 0 4px 15px var(--color-primary-shadow); }
.btn-secondary {
    background: #fff;
    color: var(--color-primary);
    padding: 10px 24px;
    border-radius: var(--radius-btn);
    font-size: 14px;
    font-weight: 600;
    border: 2px solid var(--color-primary);
    cursor: pointer;
    transition: all .3s;
    text-align: center;
    display: inline-block;
}
.btn-secondary:hover { background: var(--color-primary); color: #fff; box-shadow: 0 4px 15px var(--color-primary-shadow); }

/* Mobile toggle (no inline onclick) */
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; }
.mobile-toggle svg { width: 28px; height: 28px; }

/* Hero */
.hero {
    background: var(--color-bg-alt);
    padding: 80px 20px;
    text-align: center;
}
.hero h1 { font-size: 42px; font-weight: 700; line-height: 1.3; margin-bottom: 16px; color: var(--color-dark); }
.hero p { font-size: 18px; color: var(--color-muted); max-width: 700px; margin: 0 auto 32px; }
.hero-badges { display: flex; justify-content: center; gap: 24px; margin-bottom: 32px; flex-wrap: wrap; }
.hero-badge { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 500; color: var(--color-dark); }
.hero-badge svg { width: 24px; height: 24px; }
.hero-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero-guarantee { display: flex; justify-content: center; gap: 20px; margin-top: 24px; flex-wrap: wrap; }
.guarantee-item { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--color-muted); }

/* Stats */
.stats-bar { background: var(--color-bg-white); padding: 40px 20px; border-bottom: 1px solid var(--color-border); }
.stats-grid { display: flex; justify-content: center; gap: 60px; flex-wrap: wrap; max-width: 1140px; margin: 0 auto; }
.stat-item { text-align: center; }
.stat-number { font-size: 36px; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 14px; color: var(--color-muted); margin-top: 4px; }

/* Sections */
.section { padding: 60px 20px; }
.section-alt { background: var(--color-bg-alt); padding: 60px 20px; }
.section h2, .section-alt h2 { font-size: 28px; font-weight: 700; text-align: center; margin-bottom: 40px; color: var(--color-dark); }
.section h3 { font-size: 20px; font-weight: 600; color: var(--color-dark); margin-bottom: 12px; }
.section p, .section-alt p { font-size: 15px; color: var(--color-muted); line-height: 1.8; margin-bottom: 16px; }

/* Feature Cards */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; max-width: 1140px; margin: 0 auto; }
.feature-card {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: 0 10px 30px var(--color-shadow-card);
    border: 1px solid var(--color-border);
    transition: all .3s;
}
.feature-card:hover { border-color: var(--color-primary); box-shadow: 0 10px 30px var(--color-primary-shadow-light); }
.feature-card-icon { width: 48px; height: 48px; margin-bottom: 16px; }
.feature-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: var(--color-dark); }
.feature-card p { font-size: 14px; color: var(--color-muted); line-height: 1.8; }

/* Platform Grid */
.platform-grid { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; max-width: 1140px; margin: 0 auto 30px; }
.platform-item {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--color-border);
    transition: all .3s;
    min-width: 120px;
}
.platform-item:hover { border-color: var(--color-primary); box-shadow: 0 5px 15px var(--color-primary-shadow); }
.platform-item svg { width: 24px; height: 24px; }
.platform-item span { font-size: 14px; font-weight: 500; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); margin-bottom: 16px; overflow: hidden; transition: all .3s; }
.faq-item:hover { border-color: var(--color-primary); }
.faq-question {
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fff;
    width: 100%;
    border: none;
    text-align: left;
    color: var(--color-dark);
}
.faq-question:hover { color: var(--color-primary); }
.faq-toggle { width: 20px; height: 20px; transition: transform .3s; fill: var(--color-primary); }
.faq-item.open .faq-toggle { transform: rotate(180deg); }
.faq-answer { padding: 0 24px 20px; font-size: 14px; color: var(--color-muted); line-height: 1.8; display: none; }
.faq-item.open .faq-answer { display: block; }

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    padding: 60px 20px;
    text-align: center;
    color: #fff;
}
.cta-section h2 { font-size: 28px; font-weight: 700; margin-bottom: 16px; }
.cta-section p { font-size: 16px; margin-bottom: 32px; opacity: .9; }
.cta-section .btn-white {
    background: #fff;
    color: var(--color-primary);
    padding: 14px 32px;
    border-radius: var(--radius-btn);
    font-size: 16px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    display: inline-block;
    transition: all .3s;
    margin: 8px;
}
.cta-section .btn-white:hover { box-shadow: 0 6px 20px rgba(255,255,255,0.4); }

/* Footer */
.site-footer { background: var(--color-footer-bg); color: #fff; padding: 40px 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1140px; margin: 0 auto; }
.footer-brand h3 { font-size: 18px; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; color: var(--color-gray); line-height: 1.6; }
.footer-col h4 { font-size: 15px; font-weight: 600; margin-bottom: 16px; color: var(--color-primary); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--color-gray); transition: color .3s; }
.footer-col ul li a:hover { color: var(--color-primary); }
.footer-bottom {
    max-width: 1140px;
    margin: 30px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--color-footer-border);
    text-align: center;
    font-size: 13px;
    color: var(--color-gray);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: #fff;
    z-index: 200;
    padding: 60px 20px 20px;
}
.mobile-menu.open { display: flex; flex-direction: column; }
.mobile-menu a { font-size: 18px; padding: 12px 0; color: var(--color-dark); border-bottom: 1px solid #f0f0f0; }
.mobile-menu a:hover { color: var(--color-primary); }
.mobile-menu a.active { color: var(--color-primary); font-weight: 700; }
.mobile-close { position: absolute; top: 16px; right: 20px; background: none; border: none; cursor: pointer; }

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; max-width: 960px; margin: 0 auto; }
.pricing-card { background: #fff; border-radius: var(--radius-lg); padding: 32px 24px; border: 2px solid var(--color-border); text-align: center; transition: all .3s; position: relative; }
.pricing-card:hover { border-color: var(--color-primary); }
.pricing-card.popular { border-color: var(--color-primary); box-shadow: 0 10px 30px var(--color-primary-shadow-light); }
.pricing-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--color-primary); color: #fff; padding: 4px 16px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.pricing-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 8px; }
.pricing-price { font-size: 32px; font-weight: 700; color: var(--color-primary); margin-bottom: 4px; }
.pricing-period { font-size: 14px; color: var(--color-gray); margin-bottom: 24px; }
.pricing-features { list-style: none; padding: 0; margin-bottom: 24px; text-align: left; }
.pricing-features li { font-size: 14px; color: var(--color-muted); padding: 8px 0; border-bottom: 1px solid #f0f0f0; display: flex; align-items: center; gap: 8px; }
.pricing-features li svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Download */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; max-width: 1140px; margin: 0 auto; }
.download-card { background: #fff; border-radius: var(--radius-md); padding: 24px; border: 1px solid var(--color-border); text-align: center; transition: all .3s; }
.download-card:hover { border-color: var(--color-primary); box-shadow: 0 5px 15px var(--color-primary-shadow); }
.download-card svg { width: 40px; height: 40px; margin-bottom: 12px; }
.download-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.download-card p { font-size: 13px; color: var(--color-gray); margin-bottom: 16px; }
.download-card .btn-primary { font-size: 13px; padding: 8px 20px; }

/* Node Map */
.node-map { max-width: 1140px; margin: 0 auto; text-align: center; }
.node-map-visual { background: #fff; border-radius: var(--radius-lg); padding: 40px; border: 1px solid var(--color-border); margin-bottom: 30px; }
.node-dot { display: inline-flex; align-items: center; gap: 6px; background: var(--color-bg-alt); padding: 8px 16px; border-radius: var(--radius-sm); border: 1px solid var(--color-node-border); font-size: 13px; margin: 6px; transition: all .3s; }
.node-dot:hover { border-color: var(--color-primary); box-shadow: 0 3px 10px var(--color-primary-shadow-light); }
.node-dot .city { font-weight: 600; color: var(--color-dark); }
.node-dot .country { color: var(--color-gray); }
.node-region { margin-top: 24px; }
.node-region h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--color-dark); }

/* Support */
.support-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; max-width: 1140px; margin: 0 auto; }
.support-card { background: #fff; border-radius: var(--radius-lg); padding: 32px; border: 1px solid var(--color-border); transition: all .3s; }
.support-card:hover { border-color: var(--color-primary); box-shadow: 0 10px 30px var(--color-primary-shadow-soft); }
.support-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--color-dark); }
.support-card p { font-size: 14px; color: var(--color-muted); line-height: 1.7; }
.support-card .step-list { list-style: none; counter-reset: step; padding: 0; }
.support-card .step-list li { counter-increment: step; font-size: 14px; color: var(--color-muted); padding: 8px 0; display: flex; align-items: flex-start; gap: 12px; }
.support-card .step-list li::before { content: counter(step); background: var(--color-primary); color: #fff; width: 24px; height: 24px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; flex-shrink: 0; }

/* About */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: var(--color-dark); }
.about-content p { font-size: 15px; color: var(--color-muted); line-height: 1.8; margin-bottom: 24px; }
.about-values { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; max-width: 800px; margin: 24px auto; }
.about-value { background: var(--color-bg-alt); border-radius: var(--radius-md); padding: 24px; text-align: center; }
.about-value svg { width: 40px; height: 40px; margin-bottom: 12px; }
.about-value h4 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.about-value p { font-size: 13px; color: var(--color-muted); margin-bottom: 0; }

/* Breadcrumb */
.breadcrumb { max-width: 1140px; margin: 0 auto; padding: 20px; font-size: 13px; color: var(--color-gray); }
.breadcrumb a { color: var(--color-muted); transition: color .3s; }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb strong { color: var(--color-dark); }

/* Responsive */
@media (max-width: 768px) {
    .nav-list { display: none; }
    .nav-cta { display: none; }
    .mobile-toggle { display: block; }
    .hero h1 { font-size: 28px; }
    .hero p { font-size: 16px; }
    .stats-grid { gap: 30px; }
    .stat-number { font-size: 28px; }
    .footer-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: repeat(2, 1fr); }
    .node-map-visual { padding: 20px; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 24px; }
    .download-grid { grid-template-columns: 1fr; }
}