* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-soft: #EAF3FF;
    --primary-soft-2: #F4F8FF;
    --white: #FFFFFF;
    --page: #F7FAFF;
    --light: #EEF3F9;
    --line: #DDE7F2;
    --text: #1D2733;
    --muted: #637083;
    --soft-muted: #8A96A8;
    --shadow: 0 18px 48px rgba(35, 71, 121, .10);
    --shadow-soft: 0 10px 28px rgba(35, 71, 121, .08);
    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 18px;
    --container: 1180px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 38%, #FFFFFF 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

h1, h2, h3 {
    margin: 0;
    line-height: 1.2;
    color: var(--text);
    letter-spacing: -.03em;
}

ul, ol {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

li + li {
    margin-top: 8px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    border-bottom: 1px solid rgba(221,231,242,.78);
    backdrop-filter: blur(18px);
}

.header-inner {
    width: min(100% - 32px, var(--container));
    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: var(--text);
    letter-spacing: -.02em;
    white-space: nowrap;
}

.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(41,128,254,.18);
}

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

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 99px;
    margin: 0 auto;
}

.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    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 {
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 650;
}

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

.content-container,
.launch-hero,
.section-wrap,
.footer-inner,
.footer-bottom {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
}

.launch-hero {
    position: relative;
    padding: 46px 0 28px;
    display: grid;
    gap: 34px;
}

.launch-copy {
    position: relative;
    z-index: 2;
}

.eyebrow,
.category-badge,
.mini-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 16px;
}

.launch-hero h1,
.page-hero h1 {
    font-size: clamp(36px, 10vw, 76px);
    max-width: 840px;
    margin-bottom: 18px;
}

.hero-lead,
.page-lead {
    font-size: 17px;
    color: var(--muted);
    max-width: 720px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--white);
    font-weight: 850;
    box-shadow: 0 16px 34px rgba(41,128,254,.26);
    border: 0;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
    margin-top: 8px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px rgba(41,128,254,.32);
    background: #1F74F0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin: 24px 0 18px;
}

.security-tags,
.float-tags,
.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.security-tags span,
.float-tags span,
.pill-row span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    background: rgba(255,255,255,.78);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 430px;
    border-radius: var(--radius-xl);
    background:
        radial-gradient(circle at 70% 20%, rgba(41,128,254,.22), transparent 36%),
        linear-gradient(135deg, #F4F8FF 0%, #FFFFFF 48%, #EAF3FF 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
    display: grid;
    place-items: center;
    padding: 28px;
}

.hero-visual::before {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    border-radius: 999px;
    background: rgba(41,128,254,.10);
    filter: blur(2px);
    left: -60px;
    bottom: -80px;
}

.hero-device {
    width: min(310px, 82%);
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 30px 42px rgba(20, 52, 94, .20));
}

.visual-chip {
    position: absolute;
    z-index: 3;
    padding: 11px 14px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(221,231,242,.9);
    box-shadow: var(--shadow-soft);
    color: var(--text);
    font-size: 13px;
    font-weight: 800;
}

.visual-chip small {
    display: block;
    color: var(--soft-muted);
    font-size: 11px;
    font-weight: 700;
}

.chip-one { top: 28px; left: 22px; }
.chip-two { top: 96px; right: 18px; }
.chip-three { bottom: 88px; left: 18px; }
.chip-four { bottom: 26px; right: 28px; }

.section-wrap {
    padding: 44px 0;
}

.section-heading {
    display: grid;
    gap: 10px;
    margin-bottom: 24px;
}

.section-heading.center {
    text-align: center;
    justify-items: center;
}

.section-heading h2 {
    font-size: clamp(28px, 5vw, 46px);
}

.section-heading p {
    max-width: 720px;
}

.highlight-bar,
.app-category-center,
.risk-grid,
.faq-grid,
.info-grid,
.category-grid {
    display: grid;
    gap: 14px;
}

.highlight-card,
.category-card,
.risk-card,
.faq-item,
.info-card,
.note-card,
.step-card,
.panel-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: 0 10px 26px rgba(35,71,121,.05);
}

.highlight-card {
    min-height: 164px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.highlight-card h3,
.category-card h3,
.risk-card h3,
.faq-item h3,
.info-card h3,
.note-card h3,
.step-card h3,
.panel-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.card-link {
    display: inline-flex;
    color: var(--primary);
    font-weight: 850;
    margin-top: 8px;
}

.card-link::after {
    content: "→";
    margin-left: 6px;
}

.big-feature-card {
    display: grid;
    gap: 26px;
    align-items: center;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: var(--white);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-top: 22px;
}

.big-feature-card.gradient-card {
    background:
        radial-gradient(circle at 12% 8%, rgba(41,128,254,.12), transparent 32%),
        linear-gradient(135deg, #FFFFFF 0%, #F6FAFF 100%);
}

.big-feature-card.soft-card {
    background: linear-gradient(135deg, #F4F8FF 0%, #FFFFFF 100%);
}

.big-feature-card h2 {
    font-size: clamp(28px, 5vw, 48px);
    margin-bottom: 14px;
}

.feature-media {
    border-radius: 26px;
    background: linear-gradient(180deg, #F4F8FF, #FFFFFF);
    border: 1px solid var(--line);
    min-height: 280px;
    display: grid;
    place-items: center;
    padding: 22px;
    overflow: hidden;
}

.feature-media img {
    max-height: 380px;
    filter: drop-shadow(0 24px 32px rgba(20,52,94,.16));
}

.feature-points {
    display: grid;
    gap: 10px;
    margin: 18px 0 12px;
    padding: 0;
    list-style: none;
}

.feature-points li {
    margin: 0;
    padding: 12px 14px;
    border-radius: 16px;
    background: var(--primary-soft-2);
    border: 1px solid #E1ECFA;
    color: var(--muted);
}

.process-steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.step-card {
    position: relative;
    padding-left: 72px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 22px;
    left: 20px;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: var(--white);
    background: var(--primary);
    font-weight: 900;
    font-size: 13px;
    box-shadow: 0 10px 18px rgba(41,128,254,.24);
}

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

.risk-card strong {
    display: block;
    color: var(--text);
    margin-top: 10px;
    font-size: 14px;
}

.app-category-center {
    grid-template-columns: 1fr;
}

.category-card {
    min-height: 176px;
    background:
        linear-gradient(180deg, rgba(41,128,254,.05), rgba(255,255,255,0) 42%),
        var(--white);
}

.category-icon {
    width: 42px;
    height: 42px;
    border-radius: 16px;
    background: var(--primary);
    color: var(--white);
    display: grid;
    place-items: center;
    font-weight: 900;
    margin-bottom: 14px;
}

.safety-panel {
    padding: 24px;
    border-radius: var(--radius-xl);
    background:
        radial-gradient(circle at 82% 12%, rgba(41,128,254,.14), transparent 34%),
        linear-gradient(135deg, #F5F9FF 0%, #FFFFFF 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.cta-section {
    text-align: center;
    padding: 36px 20px;
    border-radius: var(--radius-xl);
    background:
        radial-gradient(circle at 50% 0%, rgba(41,128,254,.16), transparent 38%),
        linear-gradient(135deg, #F4F8FF, #FFFFFF);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.cta-section h2 {
    font-size: clamp(28px, 6vw, 48px);
    margin-bottom: 12px;
}

.page-hero {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    padding: 44px 0 24px;
}

.page-shell {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    padding: 18px 0 56px;
    display: grid;
    gap: 20px;
}

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

.article-main,
.article-side {
    display: grid;
    gap: 18px;
}

.article-section {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: 0 10px 26px rgba(35,71,121,.05);
}

.article-section h2 {
    font-size: 26px;
    margin-bottom: 12px;
}

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

.check-list li,
.clean-list li {
    margin: 0;
    padding: 12px 14px;
    border-radius: 16px;
    background: var(--primary-soft-2);
    border: 1px solid #E1ECFA;
    color: var(--muted);
}

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

.faq-item p {
    margin-bottom: 0;
}

.download-steps {
    display: grid;
    gap: 14px;
    margin: 24px 0;
}

.download-page .cta-section {
    margin-top: 20px;
}

.site-footer {
    margin-top: 20px;
    background: #F4F8FF;
    border-top: 1px solid var(--line);
}

.footer-inner {
    padding: 42px 0 26px;
    display: grid;
    gap: 28px;
}

.footer-brand p {
    max-width: 520px;
    margin-top: 14px;
}

.footer-links {
    display: grid;
    gap: 20px;
}

.footer-links h3 {
    font-size: 15px;
    margin-bottom: 12px;
}

.footer-links a {
    display: block;
    color: var(--muted);
    font-weight: 650;
    margin: 7px 0;
}

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

.footer-bottom {
    padding: 18px 0 28px;
    border-top: 1px solid var(--line);
}

.footer-bottom p {
    font-size: 13px;
    margin: 0;
}

@media (min-width: 640px) {
    .highlight-bar,
    .risk-grid,
    .info-grid,
    .category-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }

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

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

    .launch-hero {
        grid-template-columns: 1.02fr .98fr;
        align-items: center;
        min-height: 720px;
        padding: 66px 0 42px;
    }

    .hero-lead,
    .page-lead {
        font-size: 19px;
    }

    .hero-visual {
        min-height: 590px;
    }

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

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

    .big-feature-card {
        grid-template-columns: 1fr .92fr;
        padding: 38px;
        min-height: 520px;
    }

    .big-feature-card.reverse {
        grid-template-columns: .92fr 1fr;
    }

    .big-feature-card.reverse .feature-copy {
        order: 2;
    }

    .big-feature-card.reverse .feature-media {
        order: 1;
    }

    .feature-media {
        min-height: 410px;
    }

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

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

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

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

    .article-side {
        position: sticky;
        top: 96px;
    }

    .footer-inner {
        grid-template-columns: 1.2fr 1fr;
    }

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

@media (min-width: 1180px) {
    .site-nav a {
        padding: 9px 12px;
    }
}