:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42, 101, 176);
    --text: #142033;
    --muted: #65758b;
    --line: #dce8f7;
    --soft: #f4f8fd;
    --soft-blue: #eef6ff;
    --card: rgba(255,255,255,0.88);
    --shadow: 0 18px 55px rgba(42, 101, 176, 0.10);
    --radius: 24px;
}

* {
    box-sizing: border-box;
}

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:
        radial-gradient(circle at top left, rgba(70,139,223,0.12), transparent 34rem),
        linear-gradient(180deg, #ffffff 0%, #f6faff 48%, #ffffff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,232,247,0.82);
}

.nav-shell {
    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: 760;
    letter-spacing: -0.02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 10px 28px rgba(70,139,223,0.18);
}

.brand-text {
    font-size: 1rem;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0 11px;
}

.nav-toggle span {
    height: 2px;
    width: 100%;
    background: var(--text);
    border-radius: 999px;
}

.site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 10px;
}

.site-nav.open {
    display: grid;
    gap: 4px;
}

.site-nav a {
    padding: 11px 14px;
    border-radius: 12px;
    color: var(--muted);
    font-size: 0.95rem;
}

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

.section {
    padding: 64px 0;
}

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

.centered-hero {
    text-align: center;
    padding: 76px 0 42px;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 30px;
    padding: 5px 12px;
    border: 1px solid rgba(70,139,223,0.22);
    color: var(--primary-dark);
    background: rgba(238,246,255,0.86);
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 650;
}

.centered-hero h1,
.page-hero h1 {
    margin: 18px auto 16px;
    max-width: 900px;
    font-size: clamp(2.35rem, 8vw, 4.8rem);
    line-height: 1.08;
    letter-spacing: -0.07em;
}

.page-hero h1 {
    font-size: clamp(2.1rem, 7vw, 4rem);
}

.hero-lead,
.page-lead {
    max-width: 790px;
    margin: 0 auto 26px;
    color: var(--muted);
    font-size: 1.06rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 760;
    box-shadow: 0 14px 34px rgba(70,139,223,0.24);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-1px);
    background: var(--primary-dark);
    box-shadow: 0 18px 42px rgba(70,139,223,0.28);
}

.hero-tags {
    margin-top: 22px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-tags span,
.pill {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.74);
    color: #496176;
    font-size: 0.9rem;
}

.product-bento {
    display: grid;
    gap: 16px;
    align-items: stretch;
}

.product-main-card,
.card,
.bento-card,
.category-card,
.scenario-card,
.security-panel,
.faq-item,
.cta-section,
.doc-card,
.step-card,
.product-status-card {
    border: 1px solid rgba(220,232,247,0.92);
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.product-main-card {
    min-height: 430px;
    padding: 24px;
    display: grid;
    place-items: center;
    position: relative;
    overflow: hidden;
}

.product-main-card::before {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(70,139,223,0.20), transparent 68%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.app-shot {
    position: relative;
    z-index: 1;
    width: min(310px, 80%);
    filter: drop-shadow(0 24px 42px rgba(22,58,101,0.18));
}

.product-status-grid {
    display: grid;
    gap: 16px;
}

.product-status-card {
    padding: 18px;
}

.product-status-card strong {
    display: block;
    margin-bottom: 6px;
}

.product-status-card p,
.card p,
.bento-card p,
.category-card p,
.scenario-card p,
.security-panel p,
.doc-card p,
.step-card p {
    margin: 0;
    color: var(--muted);
}

.section-heading {
    margin-bottom: 24px;
}

.section-heading h2 {
    margin: 0 0 10px;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1.16;
    letter-spacing: -0.045em;
}

.section-heading p {
    max-width: 720px;
    margin: 0;
    color: var(--muted);
}

.center-heading {
    text-align: center;
}

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

.feature-grid,
.scenario-grid,
.cards-grid {
    display: grid;
    gap: 16px;
}

.card,
.scenario-card,
.doc-card {
    padding: 22px;
}

.card h3,
.bento-card h3,
.category-card h3,
.scenario-card h3,
.doc-card h3,
.step-card h3 {
    margin: 0 0 10px;
    font-size: 1.12rem;
    letter-spacing: -0.02em;
}

.roadmap {
    position: relative;
    display: grid;
    gap: 16px;
}

.roadmap::before {
    content: "";
    position: absolute;
    left: 20px;
    top: 20px;
    bottom: 20px;
    width: 2px;
    background: linear-gradient(180deg, rgba(70,139,223,0.45), rgba(70,139,223,0.05));
}

.roadmap-step {
    position: relative;
    padding: 18px 18px 18px 58px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 20px;
}

.step-number {
    position: absolute;
    left: 10px;
    top: 18px;
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    color: #fff;
    background: var(--primary);
    font-size: 0.78rem;
    font-weight: 750;
    box-shadow: 0 8px 20px rgba(70,139,223,0.22);
}

.roadmap-step h3 {
    margin: 0 0 6px;
    font-size: 1.02rem;
}

.roadmap-step p {
    margin: 0 0 8px;
    color: var(--muted);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 720;
}

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

.category-card,
.bento-card {
    padding: 22px;
    min-height: 156px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.category-card a,
.bento-card a,
.scenario-card a {
    margin-top: 14px;
    color: var(--primary-dark);
    font-weight: 720;
}

.bento-card.large {
    min-height: 230px;
    background:
        linear-gradient(145deg, rgba(70,139,223,0.12), rgba(255,255,255,0.92)),
        #fff;
}

.bento-card.medium {
    min-height: 190px;
}

.bento-card.small {
    min-height: 150px;
}

.security-layout {
    display: grid;
    gap: 18px;
}

.security-copy {
    padding: 8px 0;
}

.security-copy h2 {
    margin: 0 0 14px;
    font-size: clamp(1.9rem, 5vw, 3.2rem);
    line-height: 1.16;
    letter-spacing: -0.045em;
}

.security-copy p {
    color: var(--muted);
}

.security-panel {
    padding: 20px;
    display: grid;
    gap: 12px;
}

.principle {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 14px;
    border-radius: 16px;
    background: var(--soft);
}

.principle span {
    flex: 0 0 28px;
    height: 28px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 750;
    font-size: 0.85rem;
}

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

.faq-item {
    padding: 18px 20px;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 740;
    color: var(--text);
}

.faq-item p {
    margin: 12px 0 0;
    color: var(--muted);
}

.cta-section {
    text-align: center;
    padding: 42px 22px;
    background:
        radial-gradient(circle at 20% 20%, rgba(70,139,223,0.16), transparent 24rem),
        linear-gradient(135deg, #ffffff, #eff7ff);
}

.cta-section h2 {
    margin: 0 0 10px;
    font-size: clamp(1.7rem, 5vw, 2.8rem);
    letter-spacing: -0.04em;
}

.cta-section p {
    max-width: 680px;
    margin: 0 auto 20px;
    color: var(--muted);
}

.page-hero {
    padding: 58px 0 32px;
    text-align: center;
}

.doc-layout {
    display: grid;
    gap: 20px;
    align-items: start;
    padding-bottom: 70px;
}

.doc-content {
    display: grid;
    gap: 18px;
}

.doc-content .doc-card {
    box-shadow: none;
}

.doc-aside {
    display: grid;
    gap: 14px;
}

.notice {
    padding: 18px;
    border-radius: 20px;
    background: #f8fbff;
    border: 1px solid var(--line);
}

.notice strong {
    display: block;
    margin-bottom: 8px;
}

.check-list,
.number-list {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.check-list li,
.number-list li {
    margin: 8px 0;
}

.step-list {
    display: grid;
    gap: 12px;
}

.step-card {
    padding: 18px;
    box-shadow: none;
}

.page-cta {
    padding: 20px 0 0;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: rgba(255,255,255,0.72);
    padding: 42px 0 26px;
}

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

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}

.site-footer p {
    color: var(--muted);
    margin: 0;
    max-width: 520px;
}

.site-footer h3 {
    margin: 0 0 10px;
    font-size: 0.98rem;
}

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 7px 0;
}

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

.footer-bottom {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--muted);
    font-size: 0.9rem;
}

@media (min-width: 720px) {
    .container {
        width: min(1120px, calc(100% - 48px));
    }

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

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

    .footer-grid {
        grid-template-columns: 1.6fr 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

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

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }

    .site-nav a {
        padding: 9px 12px;
    }

    .centered-hero {
        padding: 104px 0 54px;
    }

    .product-bento {
        grid-template-columns: 1.35fr 0.65fr;
        gap: 20px;
    }

    .product-main-card {
        min-height: 560px;
        border-radius: 30px;
    }

    .product-status-grid {
        grid-template-rows: repeat(4, 1fr);
        gap: 20px;
    }

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

    .roadmap {
        grid-template-columns: repeat(6, minmax(0, 1fr));
        align-items: stretch;
        gap: 14px;
    }

    .roadmap::before {
        left: 7%;
        right: 7%;
        top: 32px;
        bottom: auto;
        height: 2px;
        width: auto;
        background: linear-gradient(90deg, rgba(70,139,223,0.48), rgba(70,139,223,0.05));
    }

    .roadmap-step {
        padding: 64px 16px 16px;
        min-height: 210px;
    }

    .step-number {
        top: 20px;
        left: 16px;
    }

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

    .category-card.featured {
        grid-column: span 2;
        min-height: 210px;
    }

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

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

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

    .security-layout {
        grid-template-columns: 0.95fr 1.05fr;
        gap: 42px;
        align-items: center;
    }

    .scenario-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
    }

    .scenario-card {
        min-height: 210px;
    }

    .doc-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        gap: 34px;
    }

    .doc-content {
        max-width: 760px;
    }

    .doc-aside {
        position: sticky;
        top: 96px;
    }
}