* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --text: #20283A;
    --muted: #68738A;
    --line: #E7EAF2;
    --soft: #F5F7FB;
    --soft-blue: #EEF5FF;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --radius-lg: 30px;
    --radius-md: 22px;
    --shadow: 0 18px 45px rgba(40, 64, 120, 0.10);
}

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: 1.72;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(231, 234, 242, 0.88);
    backdrop-filter: blur(16px);
}

.nav-wrap {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
    color: #17213D;
}

.brand img {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    object-fit: cover;
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 14px;
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.site-nav a {
    display: block;
    padding: 11px 12px;
    color: #33405A;
    font-size: 15px;
    border-radius: 12px;
}

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

.nav-toggle {
    display: none;
}

.nav-toggle-label {
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    cursor: pointer;
}

.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #22304A;
    border-radius: 999px;
}

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

main {
    background: linear-gradient(180deg, #FFFFFF 0%, #F7F9FD 100%);
}

.section {
    padding: 62px 0;
}

.section-title {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.22;
    letter-spacing: -0.02em;
}

.section-lead {
    margin: 0 0 28px;
    color: var(--muted);
    max-width: 760px;
}

.badge, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.10);
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.25);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.28);
}

.connection-workspace-hero {
    padding: 54px 0 42px;
    background: var(--gradient);
    color: #FFFFFF;
    position: relative;
    overflow: hidden;
}

.connection-workspace-hero::before,
.connection-workspace-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,0.18);
    filter: blur(2px);
}

.connection-workspace-hero::before {
    width: 280px;
    height: 280px;
    right: -90px;
    top: -80px;
}

.connection-workspace-hero::after {
    width: 220px;
    height: 220px;
    left: -80px;
    bottom: -80px;
}

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

.hero-copy h1 {
    margin: 14px 0 16px;
    font-size: clamp(36px, 8vw, 66px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.hero-copy p {
    margin: 0 0 24px;
    color: rgba(255,255,255,0.88);
    font-size: 17px;
    max-width: 660px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.hero-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    border: 1px solid rgba(255,255,255,0.20);
    font-size: 13px;
}

.hero-visual {
    display: grid;
    gap: 16px;
}

.workspace-card {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: rgba(255,255,255,0.16);
    border: 1px solid rgba(255,255,255,0.25);
    box-shadow: 0 30px 80px rgba(16, 33, 80, 0.26);
}

.workspace-card img {
    width: 100%;
    border-radius: 24px;
    background: #FFFFFF;
}

.status-panel {
    margin-top: 16px;
    display: grid;
    gap: 10px;
}

.status-line {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.92);
    color: #1F2B46;
    font-size: 14px;
}

.status-line strong {
    color: var(--primary);
}

.quick-task-entries {
    margin-top: -26px;
    position: relative;
    z-index: 3;
}

.quick-task-grid {
    display: grid;
    gap: 16px;
}

.task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 28px rgba(26, 42, 76, 0.06);
}

.task-card {
    padding: 22px;
}

.card-tag {
    display: inline-flex;
    margin-bottom: 12px;
    color: var(--primary);
    font-weight: 800;
    font-size: 13px;
}

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

.task-card p,
.capability-card p,
.info-card p,
.risk-card p,
.step-card p,
.faq-item p {
    color: var(--muted);
    margin: 0;
}

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

.connection-capability-overview {
    background: #F7F9FD;
}

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

.capability-card {
    padding: 22px;
    min-height: 180px;
}

.capability-card.featured {
    background: linear-gradient(135deg, #FFFFFF 0%, #F2F7FF 100%);
    border-color: rgba(41, 128, 254, 0.22);
}

.split-panel {
    display: grid;
    gap: 28px;
    align-items: center;
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.split-panel.alt {
    background: linear-gradient(135deg, #FFFFFF 0%, #F4F7FF 100%);
}

.image-panel {
    border-radius: 28px;
    background: var(--soft-blue);
    padding: 16px;
}

.image-panel img {
    border-radius: 22px;
    margin: 0 auto;
}

.feature-list {
    display: grid;
    gap: 10px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}

.feature-list li {
    padding: 12px 14px;
    border-radius: 16px;
    background: var(--soft);
    color: #33405A;
}

.encrypted-tunnel-section .security-panel {
    display: grid;
    gap: 16px;
}

.security-panel {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0;
}

.security-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: #EEF5FF;
    color: #2467C9;
    font-weight: 700;
    font-size: 13px;
}

.route-status {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.route-row {
    padding: 14px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: #FFFFFF;
}

.device-grid,
.data-grid,
.scenario-grid,
.checkup-grid,
.risk-grid,
.faq-grid,
.article-grid {
    display: grid;
    gap: 16px;
}

.info-card {
    padding: 22px;
}

.data-boundary-section .info-card,
.risk-card {
    border-top: 4px solid var(--primary);
}

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

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

.step-no {
    display: inline-grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--gradient);
    color: #FFFFFF;
    font-weight: 900;
    margin-bottom: 12px;
}

.risk-card {
    padding: 20px;
}

.risk-card .suggestion {
    margin-top: 12px;
    padding: 12px;
    border-radius: 14px;
    background: var(--soft-blue);
    color: #2C5EA8;
    font-weight: 700;
}

.faq-item {
    padding: 22px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 19px;
}

.cta-section {
    padding: 66px 0;
    background: var(--gradient);
    color: #FFFFFF;
    text-align: center;
}

.cta-panel {
    max-width: 780px;
    margin: 0 auto;
}

.cta-panel h2 {
    margin: 0 0 12px;
    font-size: clamp(30px, 5vw, 46px);
    line-height: 1.18;
}

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

.page-hero {
    padding: 54px 0;
    background: linear-gradient(135deg, #F7FAFF 0%, #FFFFFF 100%);
    border-bottom: 1px solid var(--line);
}

.page-hero h1 {
    margin: 14px 0 12px;
    font-size: clamp(34px, 6vw, 56px);
    line-height: 1.12;
    letter-spacing: -0.03em;
}

.page-hero p {
    color: var(--muted);
    max-width: 760px;
    margin: 0;
}

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

.article-main {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.article-main h2 {
    margin-top: 0;
    font-size: 26px;
}

.article-main p {
    color: #4D5870;
}

.article-main .download-btn {
    margin-top: 12px;
}

.aside-card {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    position: sticky;
    top: 92px;
}

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

.check-list li {
    padding: 12px 14px;
    border-radius: 16px;
    background: var(--soft);
    color: #33405A;
}

.site-footer {
    background: #182136;
    color: rgba(255,255,255,0.76);
    padding: 42px 0 22px;
}

.footer-grid {
    display: grid;
    gap: 26px;
}

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

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

.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255,255,255,0.76);
}

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

.footer-bottom {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 14px;
}

@media (min-width: 680px) {
    .quick-task-grid,
    .data-grid,
    .scenario-grid,
    .checkup-grid,
    .faq-grid,
    .risk-grid,
    .device-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

@media (min-width: 960px) {
    .nav-toggle-label {
        display: none;
    }

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

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

    .hero-grid {
        grid-template-columns: 1.05fr 0.95fr;
    }

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

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

    .capability-card.featured {
        grid-column: span 2;
        min-height: 220px;
    }

    .split-panel {
        grid-template-columns: 1fr 1fr;
        padding: 34px;
    }

    .encrypted-tunnel-section .security-panel {
        grid-template-columns: 1.1fr 0.9fr;
        align-items: center;
    }

    .data-grid,
    .scenario-grid,
    .checkup-grid,
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
    }

    .article-main {
        padding: 34px;
    }

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

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

    .section {
        padding: 48px 0;
    }

    .download-btn {
        width: 100%;
    }

    .hero-copy .download-btn,
    .cta-panel .download-btn,
    .article-main .download-btn {
        width: 100%;
    }

    .split-panel,
    .security-panel,
    .article-main {
        padding: 20px;
        border-radius: 24px;
    }
}