* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-dark: #1769df;
    --text: #273142;
    --muted: #667085;
    --light: #f6f9fc;
    --lighter: #eef6ff;
    --border: #dde7f2;
    --white: #ffffff;
    --panel: #fbfdff;
    --shadow: 0 18px 50px rgba(41, 128, 254, 0.12);
    --soft-shadow: 0 12px 30px rgba(39, 49, 66, 0.08);
    --radius: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #ffffff 0%, #f7fbff 42%, #ffffff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(221, 231, 242, 0.8);
}

.nav-shell {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #182230;
    letter-spacing: 0.02em;
}

.logo img {
    width: 38px;
    height: 38px;
    object-fit: contain;
    border-radius: 12px;
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--soft-shadow);
}

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

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #3f4a5f;
    font-size: 14px;
    font-weight: 650;
}

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

.nav-toggle {
    appearance: none;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 750;
}

.section,
.page-section {
    padding: 62px 0;
}

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: #edf5ff;
    border: 1px solid #d7e8ff;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 14px;
}

h1,
h2,
h3 {
    color: #172033;
    line-height: 1.2;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(28px, 5vw, 42px);
    letter-spacing: -0.03em;
}

h3 {
    font-size: 21px;
}

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

.lead {
    font-size: 18px;
    color: #526173;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    color: #fff;
    background: var(--primary);
    border-radius: 999px;
    font-weight: 850;
    box-shadow: 0 14px 26px rgba(41, 128, 254, 0.28);
    transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(41, 128, 254, 0.34);
}

.web3-dashboard-hero {
    padding: 44px 0 34px;
}

.hero-grid {
    display: grid;
    gap: 24px;
    align-items: center;
}

.hero-copy {
    background: linear-gradient(145deg, #ffffff 0%, #f1f7ff 100%);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.security-tags,
.inline-tags,
.panel-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.security-tags span,
.inline-tags span,
.panel-tags span {
    display: inline-flex;
    color: #2d5f9f;
    background: #f2f8ff;
    border: 1px solid #d8eaff;
    border-radius: 999px;
    padding: 6px 10px;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    background: radial-gradient(circle at 20% 10%, rgba(41,128,254,.18), transparent 30%), #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 22px;
    min-height: 420px;
    box-shadow: var(--soft-shadow);
}

.product-frame {
    width: min(310px, 78%);
    margin: 0 auto;
    border-radius: 28px;
    padding: 12px;
    background: linear-gradient(180deg, #f6fbff, #ffffff);
    border: 1px solid #dfe9f5;
}

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

.status-card,
.index-card,
.info-card,
.risk-card,
.faq-item,
.side-card,
.step-card,
.check-card,
.doc-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(39,49,66,.05);
}

.status-card {
    padding: 12px 14px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    font-weight: 800;
    color: #314056;
}

.status-card span {
    color: var(--primary);
    font-size: 13px;
}

.service-index {
    padding-top: 24px;
}

.section-head {
    max-width: 760px;
    margin-bottom: 24px;
}

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

.index-card {
    padding: 22px;
    position: relative;
    overflow: hidden;
}

.index-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), #9dc8ff);
}

.card-label {
    display: inline-flex;
    color: var(--primary);
    font-size: 12px;
    font-weight: 850;
    letter-spacing: .08em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

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

.feature-panel,
.digital-assets-hub,
.web3-ecosystem-section,
.hardware-wallet-section,
.swap-service-section,
.privacy-boundary-section,
.submit-chain-section,
.developer-center-section,
.cta-section {
    border-radius: 30px;
    border: 1px solid var(--border);
    overflow: hidden;
    background: #fff;
    box-shadow: var(--soft-shadow);
}

.feature-panel {
    display: grid;
    gap: 22px;
    padding: 24px;
}

.feature-panel.blue,
.cta-section {
    background: linear-gradient(140deg, #f4f9ff 0%, #ffffff 55%, #edf5ff 100%);
}

.feature-panel.soft {
    background: #f7fbff;
}

.feature-image {
    display: grid;
    place-items: center;
    min-height: 240px;
    border-radius: 24px;
    background: linear-gradient(160deg, #f0f7ff, #ffffff);
    border: 1px solid var(--border);
    padding: 18px;
}

.feature-image img {
    max-height: 360px;
    object-fit: contain;
}

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

.bullet-list li,
.clean-list li {
    position: relative;
    padding-left: 22px;
    color: #4d5b6f;
}

.bullet-list li::before,
.clean-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 13px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

.privacy-boundary-section,
.submit-chain-section,
.developer-center-section {
    padding: 24px;
}

.boundary-grid,
.submit-grid,
.developer-grid,
.risk-grid,
.faq-grid,
.process-steps,
.page-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

.info-card,
.check-card,
.doc-card,
.side-card {
    padding: 20px;
}

.info-card strong,
.check-card strong,
.doc-card strong {
    display: block;
    color: #172033;
    margin-bottom: 6px;
}

.code-panel {
    background: #f8fbff;
    border: 1px solid #dce8f6;
    border-radius: 22px;
    padding: 20px;
    color: #394a62;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 14px;
    overflow-x: auto;
}

.process-steps {
    counter-reset: step;
}

.step-card {
    position: relative;
    padding: 20px 20px 20px 68px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 18px;
    top: 20px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    border-radius: 12px;
    font-weight: 900;
    font-size: 12px;
}

.risk-card {
    padding: 20px;
    border-left: 4px solid var(--primary);
}

.risk-card .suggestion {
    display: block;
    margin-top: 10px;
    color: #355982;
    background: #f1f7ff;
    border-radius: 12px;
    padding: 9px 10px;
    font-weight: 750;
}

.faq-item {
    padding: 20px;
}

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

.cta-section {
    text-align: center;
    padding: 36px 22px;
}

.page-hero {
    padding: 54px 0 24px;
}

.page-hero-inner {
    background: linear-gradient(140deg, #ffffff, #f1f7ff);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.page-grid {
    align-items: start;
}

.article-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 26px;
    padding: 24px;
    box-shadow: var(--soft-shadow);
}

.article-card h2 {
    font-size: 28px;
}

.side-stack {
    display: grid;
    gap: 16px;
}

.note-box,
.safety-panel {
    border-radius: 22px;
    border: 1px solid #d7e8ff;
    background: #f3f8ff;
    padding: 18px;
}

.numbered-list {
    margin: 0;
    padding-left: 22px;
    color: #4d5b6f;
}

.numbered-list li {
    margin-bottom: 10px;
}

.download-single {
    margin-top: 24px;
}

.footer-grid {
    display: grid;
    gap: 22px;
}

.site-footer {
    margin-top: 60px;
    padding: 42px 0;
    background: #f5f8fc;
    border-top: 1px solid var(--border);
}

.footer-brand {
    font-size: 22px;
    font-weight: 900;
    margin-bottom: 8px;
}

.footer-links {
    display: grid;
    gap: 8px;
}

.footer-links a {
    color: #3c4d63;
    font-weight: 700;
}

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

.footer-note {
    color: var(--muted);
}

@media (min-width: 640px) {
    .index-grid,
    .category-grid,
    .risk-grid,
    .related-grid,
    .boundary-grid,
    .submit-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .status-stack {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        justify-content: flex-end;
        background: transparent;
        border: 0;
        box-shadow: none;
        padding: 0;
        gap: 2px;
    }
    .site-nav a {
        padding: 8px 10px;
        font-size: 13px;
    }
    .hero-grid,
    .feature-panel,
    .developer-grid,
    .page-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
    }
    .feature-panel.reverse {
        grid-template-columns: minmax(320px, .95fr) minmax(0, 1.05fr);
    }
    .feature-panel.reverse .feature-image {
        order: -1;
    }
    .index-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .index-card.wide {
        grid-column: span 2;
    }
    .boundary-grid,
    .submit-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.2fr .8fr 1fr;
    }
}

@media (min-width: 1100px) {
    .site-nav a {
        font-size: 14px;
        padding: 8px 12px;
    }
    .hero-copy,
    .hero-visual {
        min-height: 520px;
    }
}