:root {
    --primary: #2980FE;
    --primary-dark: #1268dc;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f8fc;
    --soft-blue: #eef6ff;
    --line: #dfe7f1;
    --white: #ffffff;
    --gray: #f3f5f8;
    --deep: #111827;
    --shadow: 0 18px 45px rgba(41, 128, 254, .10);
    --radius: 24px;
}

* { box-sizing: border-box; }
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, #f8fbff 0%, #ffffff 28%, #f7f9fc 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; }
.section { padding: 56px 0; }
.section-title { font-size: clamp(1.7rem, 5vw, 2.7rem); line-height: 1.2; margin: 0 0 16px; color: var(--deep); letter-spacing: -0.02em; }
.section-lead { color: var(--muted); margin: 0 0 24px; max-width: 760px; }
.badge, .category-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 13px; border-radius: 999px;
    background: #eaf3ff; color: var(--primary); font-weight: 700; font-size: .88rem;
    border: 1px solid #d4e7ff;
}
.kicker { color: var(--primary); font-weight: 800; letter-spacing: .06em; font-size: .82rem; text-transform: uppercase; }

/* header / logo / responsive nav / mobile nav / desktop nav */
.site-header {
    position: sticky; top: 0; z-index: 20;
    background: rgba(255,255,255,.92); backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(223,231,241,.85);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; color: var(--deep); white-space: nowrap; }
.logo img { width: 38px; height: 38px; object-fit: contain; border-radius: 12px; }
.main-nav { display: none; flex-direction: column; gap: 6px; position: absolute; left: 16px; right: 16px; top: 72px; background: var(--white); border: 1px solid var(--line); border-radius: 20px; padding: 12px; box-shadow: var(--shadow); }
.main-nav.open { display: flex; }
.main-nav a { color: #344054; padding: 10px 12px; border-radius: 12px; font-size: .95rem; }
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: var(--soft-blue); }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; border: 0; background: var(--soft-blue); border-radius: 12px; padding: 11px; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--primary); border-radius: 99px; }

/* unified download button */
.download-btn {
    display: inline-flex; align-items: center; justify-content: center;
    min-height: 48px; padding: 0 24px; border-radius: 999px;
    color: var(--white); background: var(--primary); font-weight: 800;
    box-shadow: 0 12px 24px rgba(41,128,254,.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    border: 0; white-space: nowrap;
}
.download-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 16px 28px rgba(41,128,254,.28); }

/* gradient background / content container */
.gradient-bg {
    background: radial-gradient(circle at 12% 10%, rgba(41,128,254,.14), transparent 32%),
                radial-gradient(circle at 90% 18%, rgba(41,128,254,.10), transparent 28%),
                linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
}
.content-container { max-width: 920px; margin: 0 auto; }

/* web3 dashboard hero */
.web3-dashboard-hero { padding: 48px 0 32px; position: relative; overflow: hidden; }
.hero-grid { display: grid; gap: 28px; align-items: center; }
.hero-copy h1 { margin: 16px 0 16px; font-size: clamp(2.2rem, 10vw, 4.7rem); line-height: 1.04; color: var(--deep); letter-spacing: -0.055em; }
.hero-copy p { margin: 0 0 22px; color: var(--muted); font-size: 1.05rem; }
.safe-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.safe-tags span { background: var(--white); border: 1px solid var(--line); color: #475467; padding: 8px 12px; border-radius: 999px; font-weight: 700; font-size: .86rem; }
.hero-panel { position: relative; padding: 18px; border-radius: 30px; background: rgba(255,255,255,.82); border: 1px solid var(--line); box-shadow: var(--shadow); }
.product-frame { background: linear-gradient(145deg, #eef6ff, #ffffff); border: 1px solid #dcecff; border-radius: 26px; padding: 22px; min-height: 280px; display: grid; place-items: center; }
.product-frame img { max-height: 430px; object-fit: contain; filter: drop-shadow(0 18px 24px rgba(41,128,254,.13)); }
.status-stack { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 14px; }
.status-card { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 14px; border-radius: 18px; background: var(--white); border: 1px solid var(--line); }
.status-card strong { color: var(--deep); }
.status-card span { color: var(--primary); font-size: .82rem; font-weight: 800; }

/* service index / service card / category grid */
.service-index { padding: 36px 0 56px; }
.service-index .section-title { margin-bottom: 10px; }
.service-grid, .category-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.service-card {
    background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 20px; box-shadow: 0 12px 24px rgba(15, 23, 42, .04);
    min-height: 168px; display: flex; flex-direction: column; justify-content: space-between;
}
.service-card .tag { color: var(--primary); font-weight: 900; font-size: .78rem; }
.service-card h3, .info-card h3, .risk-card h3, .faq-item h3 { margin: 8px 0 8px; color: var(--deep); line-height: 1.35; }
.service-card p, .info-card p, .risk-card p, .faq-item p { color: var(--muted); margin: 0; }
.service-card a, .text-link { margin-top: 14px; color: var(--primary); font-weight: 800; display: inline-flex; align-items: center; gap: 6px; }
.service-card a::after, .text-link::after { content: '→'; }

/* digital assets hub / web3 ecosystem section / hardware wallet section / swap service section */
.feature-block { padding: 64px 0; }
.feature-card {
    display: grid; gap: 24px; align-items: center;
    background: var(--white); border: 1px solid var(--line); border-radius: 30px; padding: 22px; box-shadow: var(--shadow);
}
.feature-card.reverse { background: linear-gradient(180deg, #f9fbff, #ffffff); }
.feature-media { border-radius: 26px; background: var(--soft-blue); border: 1px solid #d9ebff; padding: 18px; min-height: 250px; display: grid; place-items: center; }
.feature-media.gray { background: #f4f7fb; }
.feature-copy h2 { font-size: clamp(1.7rem, 6vw, 3rem); line-height: 1.16; margin: 10px 0 14px; color: var(--deep); }
.feature-copy p { color: var(--muted); margin: 0 0 16px; }
.feature-points { display: grid; gap: 10px; margin: 18px 0; padding: 0; list-style: none; }
.feature-points li { display: flex; gap: 10px; color: #344054; }
.feature-points li::before { content: ''; width: 9px; height: 9px; margin-top: 10px; border-radius: 99px; background: var(--primary); flex: 0 0 auto; }
.digital-assets-hub .feature-card { border-top: 5px solid var(--primary); }
.web3-ecosystem-section .feature-card { background: linear-gradient(135deg, #ffffff, #f4f9ff); }
.hardware-wallet-section { background: linear-gradient(180deg, #f6f9fd, #ffffff); }
.swap-service-section .feature-media { background: linear-gradient(145deg, #eaf3ff, #ffffff); }

/* privacy boundary section / submit chain section / developer center section */
.privacy-boundary-section, .submit-chain-section, .developer-center-section { padding: 58px 0; }
.panel-grid { display: grid; gap: 18px; }
.safety-panel {
    background: var(--white); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 14px 30px rgba(15,23,42,.05);
}
.safety-panel h2 { margin: 8px 0 12px; font-size: clamp(1.55rem, 5vw, 2.6rem); line-height: 1.2; color: var(--deep); }
.safety-panel p { color: var(--muted); }
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.tag-row span { border: 1px solid #d6e8ff; background: #f0f7ff; color: var(--primary); border-radius: 999px; padding: 8px 12px; font-weight: 800; font-size: .84rem; }
.ecosystem-card {
    background: linear-gradient(150deg, #f8fbff, #ffffff); border: 1px solid var(--line); border-radius: 28px; padding: 22px;
}
.ecosystem-card ul { margin: 0; padding-left: 20px; color: #475467; }
.code-panel {
    background: #f9fbff; border: 1px solid #d7e8ff; border-radius: 28px; padding: 22px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; color: #344054;
}
.code-line { display: block; padding: 8px 0; border-bottom: 1px dashed #dcecff; }
.code-line:last-child { border-bottom: 0; }
.code-key { color: var(--primary); font-weight: 800; }

/* process steps */
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card {
    position: relative; background: var(--white); border: 1px solid var(--line); border-radius: 24px; padding: 22px 20px 20px 70px;
}
.step-card::before {
    counter-increment: step; content: counter(step, decimal-leading-zero);
    position: absolute; left: 18px; top: 20px; width: 38px; height: 38px; border-radius: 14px; background: var(--primary); color: white; font-weight: 900; display: grid; place-items: center;
}
.step-card h3 { margin: 0 0 6px; color: var(--deep); }
.step-card p { margin: 0 0 10px; color: var(--muted); }
.step-card a { color: var(--primary); font-weight: 800; }

/* risk grid */
.risk-grid { display: grid; gap: 16px; }
.risk-card {
    background: var(--white); border: 1px solid var(--line); border-left: 4px solid var(--primary); border-radius: 22px; padding: 20px;
}
.risk-card .label { display: inline-block; color: var(--primary); background: var(--soft-blue); border-radius: 999px; padding: 4px 10px; font-size: .78rem; font-weight: 800; }

/* FAQ item */
.faq-list { display: grid; gap: 14px; }
.faq-item { background: var(--white); border: 1px solid var(--line); border-radius: 22px; padding: 20px; }
.faq-item h2, .faq-item h3 { font-size: 1.05rem; }

/* cta section */
.cta-section { padding: 62px 0; text-align: center; background: linear-gradient(145deg, #edf6ff, #ffffff); }
.cta-box { background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 32px; padding: 34px 22px; box-shadow: var(--shadow); }
.cta-box h2 { margin: 0 0 12px; font-size: clamp(1.7rem, 6vw, 3rem); line-height: 1.18; color: var(--deep); }
.cta-box p { margin: 0 auto 22px; max-width: 720px; color: var(--muted); }

/* general pages */
.page-hero { padding: 48px 0 28px; }
.page-hero h1 { font-size: clamp(2rem, 8vw, 4rem); line-height: 1.1; margin: 14px 0; color: var(--deep); letter-spacing: -0.04em; }
.page-hero p { color: var(--muted); margin: 0; max-width: 820px; font-size: 1.04rem; }
.page-layout { display: grid; gap: 24px; padding: 28px 0 64px; }
.article-card { background: var(--white); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 14px 28px rgba(15,23,42,.04); }
.article-card h2 { color: var(--deep); margin: 0 0 12px; font-size: 1.45rem; }
.article-card p { color: var(--muted); }
.article-card ul, .article-card ol { color: #475467; padding-left: 22px; }
.side-panel { display: grid; gap: 16px; align-content: start; }
.info-card { background: var(--white); border: 1px solid var(--line); border-radius: 24px; padding: 20px; }
.info-card.blue { background: var(--soft-blue); border-color: #d6e8ff; }
.check-list { display: grid; gap: 12px; padding: 0; margin: 18px 0 0; list-style: none; }
.check-list li { padding: 12px 14px; border: 1px solid var(--line); border-radius: 16px; background: #fbfdff; color: #475467; }
.download-row { margin-top: 24px; }
.download-page-steps { display: grid; gap: 14px; margin-top: 24px; }
.download-step { background: #fbfdff; border: 1px solid var(--line); border-radius: 20px; padding: 18px; }
.about-grid { display: grid; gap: 18px; }

/* footer */
.site-footer { background: #f3f6fa; border-top: 1px solid var(--line); padding: 42px 0 22px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-weight: 900; font-size: 1.2rem; color: var(--deep); }
.site-footer p { color: var(--muted); margin: 10px 0 0; }
.site-footer h2 { font-size: 1rem; margin: 0 0 12px; color: var(--deep); }
.site-footer a { display: block; color: #475467; margin: 8px 0; }
.site-footer a:hover { color: var(--primary); }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: #667085; display: flex; flex-direction: column; gap: 8px; font-size: .9rem; }

@media (min-width: 620px) {
    .service-grid, .category-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .status-stack { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 860px) {
    .nav-toggle { display: none; }
    .main-nav { display: flex; position: static; flex-direction: row; align-items: center; gap: 3px; background: transparent; border: 0; border-radius: 0; box-shadow: none; padding: 0; }
    .main-nav a { font-size: .88rem; padding: 8px 10px; }
    .web3-dashboard-hero { padding: 78px 0 48px; }
    .hero-grid { grid-template-columns: 1.04fr .96fr; gap: 44px; }
    .service-grid { grid-template-columns: repeat(7, 1fr); }
    .service-card { grid-column: span 2; }
    .service-card:nth-child(1), .service-card:nth-child(7) { grid-column: span 3; }
    .feature-card { grid-template-columns: 1fr 1fr; padding: 34px; }
    .feature-card.reverse .feature-media { order: 2; }
    .panel-grid { grid-template-columns: 1.1fr .9fr; align-items: stretch; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .footer-grid { grid-template-columns: 1.3fr .8fr .8fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1080px) {
    .main-nav a { padding: 8px 12px; }
    .status-card.floating { position: absolute; width: 220px; }
    .status-card.float-a { right: -18px; top: 42px; }
    .status-card.float-b { left: -14px; bottom: 92px; }
}