* {
    box-sizing: border-box;
}

:root {
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --deep: #172033;
    --text: #303A4D;
    --muted: #657085;
    --line: #E6EAF2;
    --soft: #F5F7FB;
    --soft-blue: #F1F6FF;
    --white: #FFFFFF;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 16px 45px rgba(24, 42, 92, 0.10);
    --radius: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    color: var(--text);
    background: #FFFFFF;
    line-height: 1.7;
}

body, input, button {
    font-size: 16px;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(230, 234, 242, 0.9);
    backdrop-filter: blur(16px);
}

.header-inner {
    width: min(1160px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--deep);
    letter-spacing: -0.02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 22px rgba(41, 128, 254, 0.16);
}

.brand-text {
    white-space: nowrap;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    background: var(--white);
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--deep);
    border-radius: 99px;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.site-nav.is-open {
    display: flex;
}

.site-nav a {
    color: var(--muted);
    padding: 10px 12px;
    border-radius: 12px;
    font-weight: 600;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: var(--soft-blue);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 28px;
    border-radius: 999px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(23, 104, 232, 0.30);
}

.section {
    padding: 70px 0;
}

.section-head {
    margin-bottom: 28px;
}

.section-head.center {
    text-align: center;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 30px;
    padding: 5px 12px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

h1,
h2,
h3 {
    color: var(--deep);
    line-height: 1.18;
    margin: 0;
}

h1 {
    font-size: clamp(34px, 7vw, 62px);
    letter-spacing: -0.05em;
}

h2 {
    font-size: clamp(26px, 4.6vw, 42px);
    letter-spacing: -0.04em;
}

h3 {
    font-size: 20px;
    letter-spacing: -0.02em;
}

p {
    margin: 0;
}

.lead {
    color: var(--muted);
    font-size: 18px;
    margin-top: 16px;
}

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: rgba(255,255,255,.92);
    padding: 64px 0 54px;
}

.vpn-network-hero::before,
.cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 20%, rgba(255,255,255,.24) 0 2px, transparent 3px),
        radial-gradient(circle at 75% 35%, rgba(255,255,255,.2) 0 2px, transparent 3px),
        radial-gradient(circle at 48% 75%, rgba(255,255,255,.18) 0 2px, transparent 3px),
        linear-gradient(120deg, transparent 0 18%, rgba(255,255,255,.16) 18.2%, transparent 18.6% 54%, rgba(255,255,255,.12) 54.2%, transparent 54.6%);
    opacity: .85;
}

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

.hero-copy h1,
.hero-copy p {
    color: #FFFFFF;
}

.hero-copy .lead {
    color: rgba(255,255,255,.86);
    max-width: 620px;
}

.hero-actions {
    margin-top: 26px;
}

.hero-tags,
.float-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.hero-tags span,
.float-tags span,
.inline-tags span {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 8px 12px;
    background: rgba(255,255,255,.15);
    color: #FFFFFF;
    border: 1px solid rgba(255,255,255,.22);
    font-weight: 700;
    font-size: 13px;
}

.hero-visual {
    position: relative;
    min-height: 300px;
}

.hero-device {
    position: relative;
    z-index: 2;
    width: min(420px, 92%);
    margin: 0 auto;
    border-radius: 32px;
    filter: drop-shadow(0 28px 60px rgba(15, 30, 86, 0.32));
}

.status-card {
    position: absolute;
    z-index: 3;
    background: rgba(255,255,255,.92);
    color: var(--deep);
    border: 1px solid rgba(255,255,255,.54);
    border-radius: 18px;
    padding: 10px 14px;
    box-shadow: 0 14px 32px rgba(20, 30, 70, .18);
    font-weight: 800;
    font-size: 13px;
}

.status-card small {
    display: block;
    color: var(--muted);
    font-weight: 600;
}

.status-card.one { left: 2%; top: 12%; }
.status-card.two { right: 0; top: 26%; }
.status-card.three { left: 9%; bottom: 18%; }
.status-card.four { right: 7%; bottom: 5%; }

.node-overview {
    margin-top: -34px;
    position: relative;
    z-index: 4;
}

.overview-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.node-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.node-card .label {
    display: inline-flex;
    padding: 5px 10px;
    background: var(--soft-blue);
    color: var(--blue);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 12px;
}

.node-card p,
.feature-card p,
.info-panel p,
.risk-card p,
.faq-card p,
.step-card p {
    color: var(--muted);
    margin-top: 10px;
}

.text-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--blue);
    font-weight: 800;
}

.split-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}

.visual-panel {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 18px;
    box-shadow: var(--shadow);
}

.visual-panel.soft {
    background: linear-gradient(145deg, #FFFFFF 0%, #F3F7FF 100%);
}

.visual-panel img {
    border-radius: 24px;
    margin: 0 auto;
}

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

.check-list li,
.simple-list li {
    position: relative;
    padding-left: 26px;
    color: var(--text);
}

.check-list li::before,
.simple-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, .12);
}

.global-nodes-section {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, #F8FAFF 0%, #FFFFFF 100%);
}

.map-panel {
    position: relative;
    min-height: 360px;
    border-radius: 32px;
    background:
        radial-gradient(circle at 20% 30%, rgba(41,128,254,.16) 0 6px, transparent 7px),
        radial-gradient(circle at 68% 45%, rgba(123,78,241,.18) 0 7px, transparent 8px),
        radial-gradient(circle at 42% 70%, rgba(184,77,218,.16) 0 5px, transparent 6px),
        linear-gradient(120deg, rgba(41,128,254,.08), rgba(123,78,241,.06));
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.map-panel::after {
    content: "";
    position: absolute;
    inset: 32px;
    border: 1px dashed rgba(41, 128, 254, .28);
    border-radius: 28px;
}

.map-panel img {
    position: relative;
    z-index: 2;
    width: min(430px, 90%);
    margin: 44px auto 0;
    filter: drop-shadow(0 18px 36px rgba(41, 128, 254, .16));
}

.node-note {
    position: relative;
    z-index: 3;
    margin: -38px 18px 18px;
    background: rgba(255,255,255,.93);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 18px;
}

.high-speed-section {
    background: var(--soft);
}

.speed-card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 22px;
}

.speed-card,
.feature-card,
.info-panel,
.risk-card,
.faq-card,
.step-card,
.notice-card,
.related-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 12px 30px rgba(22, 32, 58, .06);
}

.speed-card strong {
    color: var(--blue);
    font-size: 24px;
}

.privacy-protection-section .safety-panel {
    background: linear-gradient(145deg, #FFFFFF, #F4F8FF);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 26px;
    box-shadow: var(--shadow);
}

.security-meter {
    height: 12px;
    background: #E7EEFF;
    border-radius: 999px;
    overflow: hidden;
    margin: 18px 0;
}

.security-meter span {
    display: block;
    width: 76%;
    height: 100%;
    background: var(--blue);
    border-radius: inherit;
}

.feature-grid,
.policy-grid,
.risk-grid,
.faq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.feature-card {
    min-height: 100%;
}

.no-log-policy-section {
    background: linear-gradient(180deg, #FFFFFF, #F8FAFF);
}

.multi-device-section .device-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 22px;
}

.device-pill {
    padding: 16px 18px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: var(--white);
    font-weight: 800;
    color: var(--deep);
}

.encryption-protocol-section {
    background: var(--deep);
    color: rgba(255,255,255,.84);
}

.encryption-protocol-section h2,
.encryption-protocol-section h3 {
    color: #FFFFFF;
}

.encryption-protocol-section .lead,
.encryption-protocol-section p {
    color: rgba(255,255,255,.72);
}

.tech-panel {
    display: grid;
    gap: 14px;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 30px;
    padding: 22px;
}

.tech-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 14px;
    border-radius: 16px;
    background: rgba(255,255,255,.08);
}

.process-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.step-card {
    position: relative;
    padding-left: 82px;
}

.step-no {
    position: absolute;
    left: 22px;
    top: 22px;
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 900;
}

.risk-card {
    border-left: 4px solid var(--blue);
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 22px;
}

.faq-item + .faq-item {
    margin-top: 14px;
}

.faq-item h3 {
    font-size: 18px;
}

.faq-item p {
    color: var(--muted);
    margin-top: 10px;
}

.cta-section {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #FFFFFF;
    padding: 70px 0;
}

.cta-box {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 780px;
    margin: 0 auto;
}

.cta-box h2,
.cta-box p {
    color: #FFFFFF;
}

.cta-box p {
    color: rgba(255,255,255,.84);
    margin: 16px auto 26px;
}

.page-hero {
    padding: 58px 0 34px;
    background: linear-gradient(180deg, #F3F7FF 0%, #FFFFFF 100%);
}

.page-hero-inner {
    max-width: 900px;
}

.page-hero .download-btn {
    margin-top: 24px;
}

.content-area {
    padding: 42px 0 76px;
}

.guide-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: start;
}

.article-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.article-card h2 {
    font-size: clamp(22px, 4vw, 32px);
    margin-top: 26px;
}

.article-card h2:first-child {
    margin-top: 0;
}

.article-card p {
    margin-top: 12px;
    color: var(--muted);
}

.article-card .simple-list {
    margin-bottom: 8px;
}

.side-panel {
    display: grid;
    gap: 16px;
}

.related-card a {
    display: block;
    color: var(--blue);
    font-weight: 800;
    margin-top: 10px;
}

.download-steps {
    counter-reset: step;
    display: grid;
    gap: 14px;
    margin-top: 22px;
}

.download-step {
    counter-increment: step;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--white);
}

.download-step::before {
    content: counter(step);
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 900;
}

.notice-card {
    background: var(--soft-blue);
}

.site-footer {
    background: #F7F9FD;
    border-top: 1px solid var(--line);
    padding: 48px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 26px;
}

.footer-brand p {
    color: var(--muted);
    margin-top: 14px;
}

.footer-links {
    display: grid;
    gap: 10px;
}

.footer-links h2 {
    font-size: 16px;
    margin-bottom: 4px;
}

.footer-links a {
    color: var(--muted);
}

.footer-links a:hover {
    color: var(--blue);
}

.footer-bottom {
    margin-top: 38px;
    padding: 18px 16px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--line);
}

@media (min-width: 700px) {
    .overview-grid,
    .feature-grid,
    .policy-grid,
    .risk-grid,
    .faq-grid,
    .speed-card-grid,
    .multi-device-section .device-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .article-card {
        padding: 34px;
    }

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }
}

@media (min-width: 980px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
    }

    .site-nav a {
        font-size: 14px;
        padding: 9px 10px;
    }

    .hero-inner {
        grid-template-columns: 1.04fr .96fr;
    }

    .vpn-network-hero {
        padding: 88px 0 82px;
    }

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

    .split-section {
        grid-template-columns: 1fr 1fr;
        gap: 48px;
    }

    .split-section.reverse .visual-panel {
        order: -1;
    }

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

    .policy-grid,
    .risk-grid,
    .faq-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .guide-layout {
        grid-template-columns: minmax(0, 1fr) 310px;
        gap: 28px;
    }

    .side-panel {
        position: sticky;
        top: 92px;
    }

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

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .download-btn {
        width: 100%;
        padding-left: 18px;
        padding-right: 18px;
    }

    .hero-tags span,
    .float-tags span,
    .inline-tags span {
        font-size: 12px;
    }

    .status-card {
        position: static;
        margin: 8px auto;
        width: min(260px, 92%);
    }

    .hero-visual {
        min-height: auto;
    }

    .hero-device {
        margin-bottom: 14px;
    }
}