/* 基础变量与全局样式 */
:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --button-blue: #2980FE;
    --button-blue-hover: #1768E8;
    --text-dark: #1f2937;
    --text-mid: #5f6b7a;
    --text-light: #7b8794;
    --bg-soft: #f5f7fb;
    --bg-blue-soft: #f3f7ff;
    --border: #e6ebf2;
    --card-shadow: 0 18px 45px rgba(37, 56, 99, 0.08);
    --radius-lg: 32px;
    --radius-md: 24px;
    --radius-sm: 18px;
    --container: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    background: #fff;
    color: var(--text-dark);
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

p {
    margin: 0 0 16px;
    color: var(--text-mid);
}

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

h1 {
    font-size: clamp(34px, 9vw, 64px);
    letter-spacing: -1.6px;
}

h2 {
    font-size: clamp(28px, 6vw, 44px);
    letter-spacing: -1px;
}

h3 {
    font-size: 21px;
}

ul, ol {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
}

.section {
    padding: 70px 18px;
}

.container,
.content-container {
    width: min(100%, var(--container));
    margin: 0 auto;
}

.narrow-container {
    width: min(100%, 900px);
    margin: 0 auto;
}

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

.section-head.center {
    text-align: center;
}

.section-head p {
    max-width: 760px;
    margin-top: 14px;
}

.section-head.center p {
    margin-left: auto;
    margin-right: auto;
}

.badge,
.category-badge,
.mini-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 13px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.10);
    color: #1d64d8;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 14px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 38px rgba(23, 104, 232, 0.32);
}

.text-link {
    color: #1f70e8;
    font-weight: 800;
}

.text-link:hover {
    color: #1558bd;
}

/* Header 与导航 */
.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(230, 235, 242, 0.85);
}

.header-inner {
    width: min(100%, var(--container));
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    font-size: 22px;
    white-space: nowrap;
}

.logo-img,
.footer-brand img {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
}

.nav-toggle {
    display: none;
}

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

.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #26364f;
    border-radius: 999px;
}

.main-nav {
    display: none;
    position: absolute;
    left: 18px;
    right: 18px;
    top: 72px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 12px;
    box-shadow: var(--card-shadow);
}

.main-nav a {
    display: block;
    padding: 12px 14px;
    color: var(--text-mid);
    font-weight: 700;
    border-radius: 14px;
}

.main-nav a:hover,
.main-nav a.active {
    color: #1f70e8;
    background: #f2f7ff;
}

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

/* Hero */
.network-manager-hero {
    padding: 24px 18px 52px;
}

.hero-shell {
    width: min(100%, var(--container));
    margin: 0 auto;
    border-radius: 34px;
    background: var(--brand-gradient);
    overflow: hidden;
    position: relative;
    box-shadow: 0 24px 60px rgba(74, 79, 188, 0.26);
}

.hero-shell::before {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .22);
    right: -110px;
    top: -120px;
    filter: blur(8px);
}

.hero-shell::after {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .12);
    left: 8%;
    bottom: -80px;
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 28px;
    padding: 34px 22px;
    color: #fff;
}

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

.hero-copy p {
    font-size: 17px;
    opacity: .9;
    margin-top: 18px;
    max-width: 620px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 26px;
}

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

.hero-tags {
    margin-top: 24px;
}

.hero-tags span,
.float-tags span {
    padding: 8px 13px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .18);
    color: #fff;
    font-weight: 700;
    font-size: 14px;
}

.hero-visual {
    position: relative;
    min-height: 340px;
}

.hero-phone-card {
    position: relative;
    z-index: 2;
    max-width: 420px;
    margin: 0 auto;
    padding: 18px;
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.28);
    backdrop-filter: blur(12px);
}

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

.float-card {
    position: absolute;
    z-index: 3;
    background: rgba(255, 255, 255, 0.92);
    color: var(--text-dark);
    border-radius: 18px;
    padding: 11px 14px;
    box-shadow: 0 18px 40px rgba(22, 36, 83, 0.14);
    font-weight: 800;
    font-size: 14px;
}

.float-card small {
    display: block;
    color: var(--text-light);
    font-weight: 700;
    margin-top: 2px;
}

.float-card.one { top: 12px; left: 4px; }
.float-card.two { right: 0; top: 38%; }
.float-card.three { left: 18px; bottom: 22px; }

.hero-note {
    color: rgba(255,255,255,.8);
    font-size: 14px;
}

/* 日常场景 */
.daily-scenes {
    background: var(--bg-soft);
}

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

.scene-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: 0 12px 28px rgba(37, 56, 99, 0.05);
}

.scene-card .tag {
    display: inline-block;
    color: #2980FE;
    font-size: 13px;
    font-weight: 900;
    margin-bottom: 10px;
}

/* Bento 功能中心 */
.bento-feature-center {
    background: #fff;
}

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

.bento-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    min-height: 185px;
    box-shadow: 0 12px 34px rgba(37, 56, 99, 0.06);
}

.bento-card.featured {
    background: linear-gradient(135deg, #ffffff 0%, #f2f7ff 100%);
}

.bento-card h3 {
    margin: 8px 0 10px;
}

.card-kicker {
    color: #2980FE;
    font-size: 13px;
    font-weight: 900;
}

/* 首页核心模块 */
.safe-browsing-section,
.smart-route-section,
.public-wifi-section,
.privacy-guard-section,
.multi-device-section,
.network-diagnosis-section,
.account-security-section {
    background: #fff;
}

.smart-route-section,
.multi-device-section,
.network-diagnosis-section {
    background: var(--bg-blue-soft);
}

.feature-split {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--card-shadow);
}

.feature-panel.soft {
    background: #f8fbff;
}

.feature-image {
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--border);
    padding: 18px;
    box-shadow: var(--card-shadow);
}

.feature-image img {
    border-radius: 24px;
    margin: 0 auto;
}

.check-list {
    display: grid;
    gap: 12px;
    margin: 20px 0;
}

.check-list li,
.check-item {
    display: flex;
    gap: 10px;
    color: var(--text-mid);
}

.check-list li::before,
.check-item::before {
    content: "✓";
    color: #2980FE;
    font-weight: 900;
}

.info-grid {
    display: grid;
    gap: 16px;
    margin-top: 22px;
}

.info-card,
.safety-panel,
.risk-card,
.faq-item,
.step-card,
.tip-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(37, 56, 99, 0.05);
}

.safety-panel {
    border-left: 5px solid #2980FE;
}

.public-wifi-layout {
    display: grid;
    gap: 22px;
}

.public-wifi-cards {
    display: grid;
    gap: 16px;
}

.privacy-row {
    display: grid;
    gap: 16px;
}

.device-showcase {
    display: grid;
    gap: 16px;
}

.device-chip {
    padding: 18px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--border);
    font-weight: 800;
    color: var(--text-dark);
}

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

.account-check {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}

/* 新手路径与风险 */
.process-steps {
    background: var(--bg-soft);
}

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

.step-num {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: #2980FE;
    color: #fff;
    font-weight: 900;
    margin-bottom: 13px;
}

.risk-section {
    background: #fff;
}

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

.risk-card {
    border-top: 4px solid #2980FE;
}

/* FAQ */
.faq-section {
    background: var(--bg-soft);
}

.faq-list {
    display: grid;
    gap: 14px;
}

.faq-item h3 {
    margin-bottom: 8px;
}

/* CTA */
.cta-section {
    padding: 76px 18px;
}

.cta-card {
    width: min(100%, var(--container));
    margin: 0 auto;
    background: var(--brand-gradient);
    color: #fff;
    border-radius: 34px;
    padding: 38px 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card h2,
.cta-card p {
    color: #fff;
}

.cta-card p {
    max-width: 680px;
    margin: 14px auto 24px;
    opacity: .9;
}

/* 通用内页 */
.page-hero {
    padding: 56px 18px 32px;
    background: linear-gradient(180deg, #f5f8ff 0%, #ffffff 100%);
}

.page-hero-inner {
    width: min(100%, 980px);
    margin: 0 auto;
}

.page-hero p {
    font-size: 18px;
    max-width: 760px;
    margin-top: 16px;
}

.page-layout {
    width: min(100%, var(--container));
    margin: 0 auto;
    padding: 34px 18px 72px;
    display: grid;
    gap: 24px;
}

.article-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 26px;
    box-shadow: var(--card-shadow);
}

.article-card h2 {
    font-size: clamp(24px, 5vw, 34px);
    margin-bottom: 14px;
}

.article-card h3 {
    margin: 22px 0 8px;
}

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

.related-list {
    display: grid;
    gap: 10px;
}

.related-list a {
    padding: 12px 14px;
    border-radius: 14px;
    background: #f4f7fb;
    color: #1f70e8;
    font-weight: 800;
}

.page-download-row {
    margin-top: 22px;
}

.steps-list {
    counter-reset: step;
    display: grid;
    gap: 12px;
    margin: 20px 0;
}

.steps-list li {
    counter-increment: step;
    padding: 16px 16px 16px 56px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 18px;
    position: relative;
    color: var(--text-mid);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 28px;
    height: 28px;
    background: #2980FE;
    color: #fff;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

.notice-box {
    background: #f4f8ff;
    border: 1px solid #dce9ff;
    border-radius: 24px;
    padding: 22px;
}

.table-like {
    display: grid;
    gap: 12px;
}

.table-like div {
    display: grid;
    gap: 6px;
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: #fff;
}

/* Footer */
.site-footer {
    background: #101827;
    color: #dce5f4;
    padding: 34px 18px;
}

.footer-inner {
    width: min(100%, var(--container));
    margin: 0 auto;
    display: grid;
    gap: 22px;
}

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: center;
}

.footer-brand p,
.footer-note {
    color: #aebbd0;
    margin: 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-links a {
    color: #dce5f4;
    background: rgba(255,255,255,.06);
    padding: 9px 12px;
    border-radius: 999px;
}

.footer-note {
    width: min(100%, var(--container));
    margin: 22px auto 0;
    font-size: 14px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
    .scene-grid,
    .info-grid,
    .privacy-row,
    .diagnosis-grid,
    .risk-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

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

@media (min-width: 960px) {
    .section {
        padding: 92px 18px;
    }

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

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

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

    .hero-grid {
        grid-template-columns: 1.04fr .96fr;
        padding: 64px;
        min-height: 640px;
        align-items: center;
    }

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

    .bento-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        grid-auto-rows: minmax(190px, auto);
    }

    .bento-card.featured.big {
        grid-column: span 2;
        grid-row: span 2;
    }

    .bento-card.wide {
        grid-column: span 2;
    }

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

    .feature-split.reverse .feature-image {
        order: -1;
    }

    .public-wifi-layout {
        grid-template-columns: 1.1fr .9fr;
        align-items: center;
    }

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

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

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

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

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 310px;
        align-items: start;
    }

    .article-card {
        padding: 34px;
    }

    .footer-inner {
        grid-template-columns: 1fr auto;
        align-items: center;
    }
}

@media (max-width: 420px) {
    .download-btn {
        width: 100%;
    }

    .hero-actions .download-btn {
        width: auto;
        min-width: 172px;
    }

    .hero-grid {
        padding: 30px 18px;
    }

    .float-card {
        position: static;
        margin: 10px 0 0;
    }

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

    .article-card,
    .feature-panel,
    .info-card,
    .safety-panel,
    .risk-card,
    .faq-item,
    .step-card,
    .tip-card {
        padding: 20px;
    }
}