* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: #243043;
    background: #f7f9fd;
    line-height: 1.75;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

main {
    overflow: hidden;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(223, 228, 239, 0.85);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo,
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #162139;
    letter-spacing: 0.02em;
}

.logo img,
.footer-logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}

.main-nav {
    display: none;
    position: absolute;
    left: 18px;
    right: 18px;
    top: 68px;
    padding: 14px;
    background: #ffffff;
    border: 1px solid #e6ebf4;
    border-radius: 22px;
    box-shadow: 0 18px 60px rgba(36,48,67,0.12);
}

.main-nav a {
    display: block;
    padding: 12px 14px;
    border-radius: 14px;
    color: #566276;
    font-size: 15px;
}

.main-nav a:hover {
    color: #2980FE;
    background: #f1f6ff;
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid #e2e8f3;
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
    background: #fff;
}

.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #243043;
    border-radius: 999px;
}

.nav-toggle:checked ~ .main-nav {
    display: block;
}

.container {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
}

.narrow-container {
    width: min(100% - 36px, 880px);
    margin: 0 auto;
}

.section {
    padding: 72px 0;
}

.section-soft {
    background: #eef4ff;
}

.section-title {
    max-width: 760px;
    margin: 0 auto 32px;
    text-align: center;
}

.section-title .eyebrow,
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #2980FE;
    background: #eef5ff;
    border: 1px solid #dceafe;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}

.section-title h2,
.page-hero h1,
.article-main h2 {
    margin: 14px 0 12px;
    color: #152238;
    line-height: 1.2;
}

.section-title h2 {
    font-size: clamp(28px, 4vw, 42px);
}

.section-title p,
.page-hero p,
.muted {
    color: #667085;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 16px 32px rgba(41, 128, 254, 0.22);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 20px 42px rgba(23, 104, 232, 0.28);
}

.inline-link {
    display: inline-flex;
    align-items: center;
    color: #2980FE;
    font-weight: 800;
    margin-top: 10px;
}

.inline-link::after {
    content: "→";
    margin-left: 6px;
}

.vpn-saas-hero {
    position: relative;
    padding: 56px 0 86px;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    color: #fff;
    overflow: hidden;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -10%;
    right: -10%;
    bottom: -56px;
    height: 110px;
    background: #f7f9fd;
    transform: skewY(-3deg);
    transform-origin: left top;
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(36px, 9vw, 68px);
    line-height: 1.05;
    margin: 18px 0;
    letter-spacing: -0.04em;
}

.hero-content p {
    max-width: 640px;
    color: rgba(255,255,255,0.88);
    font-size: 17px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    margin: 28px 0 20px;
}

.hero-tags,
.float-tags,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-tags span,
.float-tags span,
.tag-row span {
    display: inline-flex;
    padding: 7px 11px;
    border-radius: 999px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.22);
    color: rgba(255,255,255,0.92);
    font-size: 13px;
    font-weight: 700;
}

.hero-device {
    position: relative;
    min-height: 380px;
    display: grid;
    place-items: center;
}

.hero-card {
    width: min(100%, 440px);
    padding: 18px;
    border-radius: 36px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.24);
    box-shadow: 0 28px 80px rgba(12, 21, 45, 0.28);
}

.hero-card img {
    border-radius: 28px;
    margin: 0 auto;
}

.float-card {
    position: absolute;
    display: none;
    padding: 12px 14px;
    background: #fff;
    color: #22304a;
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(24, 31, 51, 0.18);
    font-size: 14px;
    font-weight: 800;
}

.float-card.one { left: 2%; top: 18%; }
.float-card.two { right: 0; top: 26%; }
.float-card.three { left: 0; bottom: 18%; }
.float-card.four { right: 8%; bottom: 10%; }

.product-highlights {
    margin-top: -48px;
    position: relative;
    z-index: 3;
}

.highlight-grid {
    display: grid;
    gap: 16px;
}

.highlight-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.article-card,
.notice-panel,
.download-step,
.value-card {
    background: #fff;
    border: 1px solid #e5ebf5;
    border-radius: 26px;
    box-shadow: 0 16px 48px rgba(36,48,67,0.06);
}

.highlight-card {
    padding: 24px;
}

.highlight-card .label {
    display: inline-block;
    padding: 5px 10px;
    color: #2980FE;
    background: #edf5ff;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
}

.highlight-card h3,
.info-card h3,
.risk-card h3,
.step-card h3,
.article-card h3,
.value-card h3 {
    margin: 14px 0 8px;
    color: #17243a;
    line-height: 1.3;
}

.highlight-card p,
.info-card p,
.risk-card p,
.step-card p,
.article-card p,
.value-card p {
    color: #667085;
    margin: 0;
}

.feature-row,
.feature-row.reverse {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-panel {
    padding: 30px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid #e6ebf4;
    box-shadow: 0 18px 60px rgba(36,48,67,0.06);
}

.feature-panel h2 {
    margin: 12px 0;
    font-size: clamp(28px, 5vw, 44px);
    line-height: 1.18;
    color: #152238;
}

.feature-panel p {
    color: #647084;
}

.feature-list {
    display: grid;
    gap: 12px;
    margin: 22px 0;
    padding: 0;
    list-style: none;
}

.feature-list li {
    padding: 13px 14px;
    background: #f5f8fe;
    border: 1px solid #e4ebf5;
    border-radius: 16px;
    color: #344054;
}

.image-shell {
    position: relative;
    padding: 20px;
    border-radius: 36px;
    background: linear-gradient(135deg, #f7fbff, #eef3ff);
    border: 1px solid #e6edf8;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.7), 0 20px 56px rgba(36,48,67,0.08);
}

.image-shell img {
    border-radius: 26px;
    margin: 0 auto;
}

.high-speed-section .feature-panel {
    background: #fafdff;
}

.speed-metrics,
.privacy-grid,
.no-log-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.value-grid,
.download-steps,
.related-grid,
.checklist-grid {
    display: grid;
    gap: 16px;
}

.speed-metrics {
    margin-top: 18px;
}

.metric {
    padding: 18px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid #e5ebf5;
}

.metric strong {
    display: block;
    color: #2980FE;
    font-size: 20px;
}

.privacy-protection-section .privacy-wrap,
.no-log-policy-section .no-log-wrap,
.encryption-protocol-section .protocol-wrap {
    padding: 28px;
    border-radius: 36px;
    background: #fff;
    border: 1px solid #e4ebf5;
    box-shadow: 0 18px 60px rgba(36,48,67,0.06);
}

.privacy-media {
    display: grid;
    gap: 20px;
    align-items: center;
}

.info-card {
    padding: 22px;
}

.no-log-grid,
.protocol-grid,
.device-grid {
    margin-top: 20px;
}

.device-card {
    padding: 24px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid #e5ebf5;
}

.device-card img {
    border-radius: 22px;
    margin-bottom: 16px;
}

.protocol-card {
    padding: 22px;
    border-radius: 26px;
    background: #f6f9ff;
    border: 1px solid #e3ebf7;
}

.process-steps {
    display: grid;
    gap: 16px;
}

.step-card {
    padding: 22px;
    position: relative;
}

.step-number {
    display: inline-grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: #2980FE;
    color: #fff;
    font-weight: 900;
}

.risk-grid {
    margin-top: 26px;
}

.risk-card {
    padding: 22px;
    border-left: 4px solid #2980FE;
}

.risk-card .suggestion {
    margin-top: 10px;
    color: #344054;
    font-weight: 700;
}

.faq-item {
    padding: 22px;
}

.faq-item h3 {
    margin: 0 0 8px;
    color: #152238;
}

.faq-item p {
    margin: 0;
    color: #667085;
}

.cta-section {
    padding: 72px 0;
}

.cta-card {
    text-align: center;
    padding: 42px 24px;
    border-radius: 36px;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: "";
    position: absolute;
    inset: -40% auto auto -10%;
    width: 320px;
    height: 320px;
    background: rgba(255,255,255,0.14);
    border-radius: 50%;
}

.cta-card h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 5vw, 46px);
}

.cta-card p {
    max-width: 720px;
    margin: 0 auto 24px;
    color: rgba(255,255,255,0.88);
}

.page-hero {
    padding: 58px 0 42px;
    background: linear-gradient(180deg, #eef5ff 0%, #f7f9fd 100%);
}

.page-hero h1 {
    font-size: clamp(34px, 7vw, 56px);
    max-width: 820px;
}

.page-hero p {
    max-width: 760px;
    font-size: 17px;
}

.article-layout {
    display: grid;
    gap: 24px;
    align-items: start;
    padding: 38px 0 76px;
}

.article-main {
    display: grid;
    gap: 20px;
}

.article-card,
.notice-panel {
    padding: 24px;
}

.article-card ul,
.notice-panel ul {
    margin: 12px 0 0;
    padding-left: 20px;
    color: #566276;
}

.article-aside {
    display: grid;
    gap: 16px;
}

.aside-panel {
    padding: 22px;
    border-radius: 26px;
    background: #fff;
    border: 1px solid #e5ebf5;
}

.aside-panel h3 {
    margin: 0 0 10px;
    color: #152238;
}

.aside-panel a {
    display: block;
    padding: 10px 0;
    color: #2980FE;
    font-weight: 800;
    border-top: 1px solid #eef2f7;
}

.aside-panel a:first-of-type {
    border-top: 0;
}

.page-download-block {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
}

.download-steps {
    margin-top: 20px;
}

.download-step {
    padding: 20px;
}

.download-step strong {
    color: #2980FE;
}

.help-banner {
    padding: 28px;
    border-radius: 34px;
    background: linear-gradient(135deg, #ffffff, #eef5ff);
    border: 1px solid #e5ebf5;
}

.value-card {
    padding: 24px;
}

.site-footer {
    background: #121b2d;
    color: #d6deea;
    padding-top: 54px;
}

.footer-inner {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
    display: grid;
    gap: 32px;
}

.footer-brand p {
    max-width: 420px;
    color: #9aa7ba;
}

.footer-logo {
    color: #fff;
}

.footer-links {
    display: grid;
    gap: 20px;
}

.footer-links h3 {
    color: #fff;
    margin: 0 0 12px;
}

.footer-links a {
    display: block;
    color: #b8c4d5;
    padding: 5px 0;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    margin-top: 36px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: #9aa7ba;
    padding: 18px;
}

@media (min-width: 700px) {
    .highlight-grid,
    .privacy-grid,
    .no-log-grid,
    .device-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .value-grid,
    .download-steps,
    .related-grid,
    .checklist-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .speed-metrics {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .footer-links {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 960px) {
    .header-inner {
        padding: 16px 20px;
    }

    .nav-toggle-label {
        display: none;
    }

    .main-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        background: transparent;
        border: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .main-nav a {
        padding: 9px 11px;
        font-size: 14px;
    }

    .hero-grid {
        grid-template-columns: 1.05fr 0.95fr;
        min-height: 620px;
    }

    .float-card {
        display: block;
    }

    .highlight-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .feature-row {
        grid-template-columns: 1fr 1fr;
    }

    .feature-row.reverse .feature-panel {
        order: 2;
    }

    .feature-row.reverse .image-shell {
        order: 1;
    }

    .privacy-media {
        grid-template-columns: 1.1fr 0.9fr;
    }

    .no-log-grid,
    .protocol-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .device-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }

    .footer-inner {
        grid-template-columns: 1fr 1.4fr;
    }
}

@media (max-width: 420px) {
    .section {
        padding: 56px 0;
    }

    .hero-actions .download-btn,
    .cta-card .download-btn,
    .page-download-block .download-btn {
        width: 100%;
    }

    .feature-panel,
    .privacy-protection-section .privacy-wrap,
    .no-log-policy-section .no-log-wrap,
    .encryption-protocol-section .protocol-wrap {
        padding: 22px;
        border-radius: 28px;
    }
}