:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f7fb;
    --line: #e6eaf2;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(28, 46, 92, 0.10);
    --radius: 28px;
}
* { 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: var(--text);
    background: #ffffff;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { padding-left: 1.2rem; }
.content-container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}
.narrow { width: min(100% - 32px, 880px); }
.center-text { text-align: center; }
.gradient-background { background: var(--gradient); }
.site-header,
header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(230,234,242,0.9);
}
.header-inner {
    width: min(100% - 28px, 1180px);
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #172033;
    letter-spacing: -0.02em;
}
.logo img { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; box-shadow: 0 8px 22px rgba(41,128,254,.16); }
.nav-toggle { display: none; }
.mobile-nav-trigger {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
    background: #fff;
}
.mobile-nav-trigger span { width: 20px; height: 2px; background: #1f2937; display: block; border-radius: 99px; }
.responsive-nav,
.desktop-nav,
.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .responsive-nav { display: flex; }
.site-nav a { padding: 10px 12px; color: #344054; border-radius: 12px; font-size: 15px; }
.site-nav a:hover { color: var(--blue); background: #f3f7ff; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 12px 24px rgba(41, 128, 254, .24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 16px 30px rgba(23,104,232,.28); }
.vpn-saas-hero {
    position: relative;
    padding: 64px 0 88px;
    color: #fff;
    overflow: hidden;
    border-bottom-left-radius: 36px;
    border-bottom-right-radius: 36px;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    inset: auto -10% -80px -10%;
    height: 180px;
    background: #fff;
    transform: skewY(-4deg);
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 40px; align-items: center; }
.hero-copy h1 { font-size: clamp(36px, 8vw, 64px); line-height: 1.08; margin: 14px 0 18px; letter-spacing: -0.05em; }
.hero-copy p { color: rgba(255,255,255,.88); font-size: 17px; margin: 0 0 26px; max-width: 650px; }
.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
}
.hero-copy .eyebrow { background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.24); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.18); color: #fff; font-size: 13px; }
.hero-visual { position: relative; min-height: 340px; display: grid; place-items: center; }
.hero-visual img { max-height: 430px; border-radius: 34px; box-shadow: 0 26px 80px rgba(0,0,0,.22); }
.float-card { position: absolute; padding: 10px 14px; border-radius: 16px; color: #1f2937; background: rgba(255,255,255,.92); box-shadow: 0 16px 34px rgba(21, 30, 70, .16); font-weight: 700; font-size: 14px; }
.card-one { top: 28px; left: 8px; }
.card-two { top: 88px; right: 2px; }
.card-three { bottom: 66px; left: 4px; }
.card-four { bottom: 18px; right: 18px; }
.section-heading { margin-bottom: 26px; }
.section-heading h2,
.feature-copy h2,
.page-hero h1 { margin: 12px 0; line-height: 1.22; letter-spacing: -0.03em; }
.section-heading h2,
.feature-copy h2 { font-size: clamp(28px, 5vw, 42px); }
.section-heading p,
.feature-copy p,
.page-hero p { color: var(--muted); margin: 0; }
.product-highlights { padding: 76px 0 42px; }
.highlight-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.highlight-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 12px 32px rgba(28,46,92,.06);
}
.highlight-card span { color: var(--blue); font-weight: 800; }
.highlight-card h3 { margin: 10px 0 6px; font-size: 20px; }
.highlight-card p { color: var(--muted); margin: 0 0 12px; }
.highlight-card a,
.text-link,
.side-links a,
.steps-grid a,
.risk-grid a { color: var(--blue); font-weight: 700; }
.feature-split { padding: 56px 0; display: grid; gap: 30px; align-items: center; }
.feature-copy ul { color: var(--muted); }
.feature-media { border-radius: var(--radius); background: linear-gradient(145deg, #ffffff, #f1f5ff); border: 1px solid var(--line); padding: 18px; box-shadow: var(--shadow); }
.feature-media img { width: 100%; border-radius: 22px; object-fit: cover; }
.soft-section { background: var(--soft); padding: 24px 0; }
.mini-metrics,
.tech-panel { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.mini-metrics span,
.tech-panel span { padding: 10px 14px; border-radius: 14px; background: #fff; border: 1px solid var(--line); color: #344054; font-weight: 700; }
.info-panel,
.notice-box {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--blue);
    border-radius: 20px;
    padding: 18px;
    margin: 18px 0;
}
.privacy-grid { padding: 56px 0; display: grid; gap: 24px; align-items: center; }
.privacy-cards { display: grid; gap: 14px; }
.privacy-cards article,
.three-cards article,
.guide-card-grid article,
.risk-grid article,
.steps-grid article,
.faq-item,
.download-guide article {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 20px;
    box-shadow: 0 10px 28px rgba(28,46,92,.05);
}
.privacy-cards h3,
.three-cards h3,
.guide-card-grid h2,
.risk-grid h3,
.steps-grid h3,
.faq-item h2,
.faq-item h3 { margin: 0 0 8px; }
.privacy-cards p,
.three-cards p,
.guide-card-grid p,
.risk-grid p,
.steps-grid p,
.faq-item p { color: var(--muted); margin: 0; }
.three-cards { display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 18px; }
.no-log-policy-section { padding: 64px 0; }
.process-steps { padding: 70px 0; }
.steps-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.steps-grid b { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: #eef5ff; color: var(--blue); }
.safety-panel { padding: 52px 0; }
.risk-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.risk-grid article { border-top: 4px solid var(--blue); }
.risk-grid strong { display: block; margin: 12px 0; color: #344054; }
.faq-summary { padding: 52px 0 70px; }
.faq-list { display: grid; gap: 14px; }
.cta-section { color: #fff; padding: 72px 0; text-align: center; border-top-left-radius: 34px; border-top-right-radius: 34px; }
.cta-inner p { color: rgba(255,255,255,.86); margin-bottom: 24px; }
.page-hero { background: linear-gradient(180deg, #f6f8ff 0%, #fff 100%); padding: 58px 0 30px; }
.compact-hero h1 { font-size: clamp(32px, 7vw, 54px); }
.article-layout,
.download-guide,
.faq-page,
.guide-two-column,
.guide-featured { padding: 42px 0 76px; }
.article-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.article-card h2 { margin-top: 24px; }
.article-card p { color: var(--muted); }
.guide-grid,
.guide-card-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.download-guide .notice-box { margin-top: 22px; }
.single-cta { margin-top: 24px; }
.large-faq .faq-item { padding: 24px; }
.side-panel {
    background: #f7f9fe;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    height: fit-content;
}
.side-panel p { color: var(--muted); }
.side-links { display: grid; gap: 10px; }
.side-links a { background: #fff; border: 1px solid var(--line); padding: 12px 14px; border-radius: 14px; }
.site-footer,
footer { background: #101828; color: #d0d5dd; padding: 48px 0 24px; }
.footer-inner { width: min(100% - 32px, 1180px); margin: 0 auto; display: grid; gap: 26px; }
.footer-logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { max-width: 560px; margin: 0; color: #98a2b3; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: #d0d5dd; }
.footer-links a:hover { color: #fff; }
.footer-bottom { width: min(100% - 32px, 1180px); margin: 28px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: #98a2b3; font-size: 14px; }
@media (min-width: 700px) {
    .highlight-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid,
    .risk-grid,
    .guide-grid,
    .guide-card-grid,
    .three-cards { grid-template-columns: repeat(2, 1fr); }
    .privacy-grid { grid-template-columns: 1fr 1fr; }
    .privacy-grid .feature-media { grid-column: span 2; }
}
@media (min-width: 980px) {
    .mobile-nav-trigger { display: none; }
    .responsive-nav,
    .desktop-nav,
    .site-nav { position: static; display: flex; flex-direction: row; padding: 0; background: transparent; border: 0; box-shadow: none; align-items: center; gap: 4px; }
    .vpn-saas-hero { padding: 86px 0 120px; }
    .hero-grid,
    .feature-split { grid-template-columns: 1.05fr .95fr; }
    .feature-split.reverse { grid-template-columns: .95fr 1.05fr; }
    .feature-split.reverse .feature-copy { order: 2; }
    .feature-split.reverse .feature-media { order: 1; }
    .highlight-grid { grid-template-columns: repeat(4, 1fr); }
    .privacy-grid { grid-template-columns: .95fr 1fr .95fr; }
    .privacy-grid .feature-media { grid-column: auto; }
    .three-cards { grid-template-columns: repeat(3, 1fr); }
    .steps-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .guide-two-column,
    .guide-featured { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; align-items: start; }
    .article-card { padding: 38px; }
    .footer-inner { grid-template-columns: 1fr 360px; align-items: start; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1180px) {
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 420px) {
    .content-container { width: min(100% - 24px, 1180px); }
    .download-btn { width: 100%; }
    .float-card { font-size: 12px; padding: 8px 10px; }
}