* {
    box-sizing: border-box;
}

:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1F2937;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5EAF3;
    --white: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius: 26px;
    --shadow: 0 18px 45px rgba(31, 41, 55, .08);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #F7F9FC;
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .94);
    border-bottom: 1px solid rgba(229, 234, 243, .9);
    backdrop-filter: blur(18px);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #14213D;
    white-space: nowrap;
}

.brand img {
    width: 42px;
    height: 42px;
    border-radius: 13px;
    object-fit: cover;
}

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

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

.nav-toggle span {
    width: 20px;
    height: 2px;
    border-radius: 4px;
    background: #25324B;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    padding: 14px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
    display: none;
    grid-template-columns: 1fr;
    gap: 6px;
}

.nav-control:checked ~ .site-nav {
    display: grid;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #344054;
    font-size: 15px;
}

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

.section {
    padding: 58px 0;
}

.section-heading {
    max-width: 760px;
    margin-bottom: 26px;
}

.section-kicker,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
}

.section h2,
.content-page h1,
.connection-workspace-hero h1 {
    line-height: 1.18;
    letter-spacing: -.03em;
}

.section h2 {
    margin: 14px 0 10px;
    font-size: clamp(28px, 4vw, 44px);
}

.section-heading p,
.card p,
.feature-panel p,
.content-page p,
.faq-item p,
.status-panel p {
    color: var(--muted);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(41, 128, 254, .22);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(23, 104, 232, .24);
}

.text-link {
    color: var(--blue);
    font-weight: 800;
}

.connection-workspace-hero {
    background: var(--gradient);
    color: var(--white);
    padding: 42px 0 56px;
    position: relative;
    overflow: hidden;
}

.connection-workspace-hero::before,
.connection-workspace-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, .14);
    filter: blur(6px);
}

.connection-workspace-hero::before {
    width: 320px;
    height: 320px;
    left: -130px;
    top: -130px;
}

.connection-workspace-hero::after {
    width: 420px;
    height: 420px;
    right: -160px;
    bottom: -210px;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(36px, 7vw, 66px);
    margin: 14px 0 16px;
}

.hero-copy p {
    color: rgba(255,255,255,.86);
    font-size: 17px;
    max-width: 640px;
}

.hero-actions {
    margin: 24px 0;
}

.security-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.security-tags li,
.inline-tags span {
    padding: 7px 12px;
    border: 1px solid rgba(255,255,255,.26);
    border-radius: 999px;
    background: rgba(255,255,255,.12);
    color: rgba(255,255,255,.92);
    font-size: 13px;
}

.hero-visual {
    position: relative;
    min-height: 390px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-device {
    width: min(100%, 440px);
    border-radius: 34px;
    filter: drop-shadow(0 30px 65px rgba(18, 24, 38, .26));
}

.status-panel {
    position: absolute;
    left: 0;
    bottom: 18px;
    width: min(280px, 72%);
    padding: 18px;
    border-radius: 24px;
    background: rgba(255,255,255,.94);
    color: var(--text);
    box-shadow: var(--shadow);
}

.status-panel strong {
    display: block;
    margin-bottom: 4px;
}

.status-line {
    height: 8px;
    border-radius: 99px;
    margin: 14px 0;
    background: linear-gradient(90deg, #2AD47F, #2980FE);
}

.floating-task {
    position: absolute;
    right: 0;
    top: 24px;
    padding: 16px;
    border-radius: 22px;
    background: rgba(255,255,255,.94);
    box-shadow: var(--shadow);
    color: var(--text);
    display: grid;
    gap: 8px;
}

.floating-task span {
    padding: 6px 10px;
    border-radius: 999px;
    background: #F0F5FF;
    color: #2C54E8;
    font-size: 13px;
    font-weight: 700;
}

.quick-task-entries {
    margin-top: -32px;
    position: relative;
    z-index: 2;
    display: grid;
    gap: 14px;
}

.card,
.feature-panel,
.capability-card,
.faq-item,
.step-card,
.risk-card,
.info-box,
.download-panel {
    border: 1px solid var(--line);
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 14px 34px rgba(31,41,55,.05);
}

.card,
.capability-card,
.step-card,
.risk-card,
.info-box {
    padding: 22px;
}

.card h3,
.capability-card h3,
.step-card h3,
.risk-card h3,
.info-box h3 {
    margin: 0 0 8px;
    font-size: 20px;
}

.card .tag,
.capability-card .tag {
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

.connection-capability-overview {
    display: grid;
    gap: 16px;
}

.capability-card.large {
    background: linear-gradient(180deg, #FFFFFF 0%, #F4F8FF 100%);
}

.split,
.feature-panel {
    display: grid;
    gap: 24px;
    align-items: center;
}

.feature-panel {
    padding: 24px;
}

.feature-panel img,
.content-image {
    border-radius: 28px;
    background: #EEF2FF;
    box-shadow: inset 0 0 0 1px rgba(229,234,243,.8);
}

.feature-list,
.check-list,
.clean-list {
    padding: 0;
    margin: 16px 0 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.feature-list li,
.check-list li,
.clean-list li {
    position: relative;
    padding-left: 24px;
    color: #475467;
}

.feature-list li::before,
.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue);
}

.encrypted-tunnel-section {
    background: #F1F6FF;
}

.security-panel-grid,
.data-grid,
.usage-grid,
.risk-grid,
.faq-grid,
.info-grid {
    display: grid;
    gap: 16px;
}

.route-optimization-section .route-card {
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}

.route-status {
    padding: 18px;
    border-radius: 22px;
    background: #F6F8FC;
    border: 1px solid var(--line);
}

.route-status div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px dashed #D6DEEA;
    color: #475467;
}

.route-status div:last-child {
    border-bottom: 0;
}

.device-protection-section {
    background: #FFFFFF;
}

.device-stack {
    display: grid;
    gap: 12px;
}

.device-card {
    padding: 16px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: #F8FAFD;
}

.data-boundary-section {
    background: #F7F9FC;
}

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

.step-card {
    position: relative;
    padding-top: 58px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 22px;
    top: 18px;
    color: var(--blue);
    font-size: 18px;
    font-weight: 900;
}

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

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.cta-section {
    padding: 64px 0;
}

.cta-card {
    border-radius: 34px;
    background: var(--gradient);
    color: #FFFFFF;
    padding: 36px 24px;
    text-align: center;
    overflow: hidden;
    position: relative;
}

.cta-card p {
    color: rgba(255,255,255,.84);
    max-width: 680px;
    margin: 0 auto 24px;
}

.content-page {
    padding: 42px 0 64px;
}

.page-hero {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.page-hero h1 {
    font-size: clamp(32px, 6vw, 54px);
    margin: 14px 0 12px;
}

.content-layout {
    display: grid;
    gap: 20px;
}

.article-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
}

.article-card h2 {
    margin-top: 0;
    line-height: 1.3;
}

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

.note-card {
    padding: 20px;
    border-radius: 24px;
    background: #F4F8FF;
    border: 1px solid #DDE8FF;
}

.download-panel {
    padding: 24px;
    text-align: center;
}

.site-footer {
    background: #192134;
    color: rgba(255,255,255,.72);
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.footer-brand {
    color: #FFFFFF;
    font-weight: 900;
    font-size: 22px;
    margin-bottom: 10px;
}

.site-footer h3 {
    color: #FFFFFF;
    margin: 0 0 10px;
    font-size: 16px;
}

.site-footer a {
    display: block;
    padding: 4px 0;
    color: rgba(255,255,255,.72);
}

.site-footer a:hover {
    color: #FFFFFF;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    margin-top: 32px;
    padding-top: 18px;
    font-size: 14px;
}

@media (min-width: 680px) {
    .quick-task-entries,
    .security-panel-grid,
    .data-grid,
    .usage-grid,
    .faq-grid,
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

    .site-nav a {
        font-size: 14px;
        padding: 8px 10px;
    }

    .connection-workspace-hero {
        padding: 76px 0 92px;
    }

    .hero-grid {
        grid-template-columns: 1.05fr .95fr;
    }

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

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

    .capability-card.large {
        grid-column: span 2;
        min-height: 230px;
    }

    .split,
    .feature-panel {
        grid-template-columns: 1fr 1fr;
    }

    .security-panel-grid,
    .data-grid,
    .usage-grid,
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .content-layout {
        grid-template-columns: minmax(0, 1fr) 340px;
        align-items: start;
    }

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }

    .article-card,
    .page-hero {
        padding: 34px;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1180px);
    }

    .hero-visual {
        min-height: 320px;
    }

    .floating-task {
        position: static;
        width: 100%;
        margin-top: 12px;
    }

    .status-panel {
        position: static;
        width: 100%;
        margin-top: 12px;
    }

    .hero-visual {
        display: block;
    }

    .download-btn {
        width: 100%;
    }
}