:root {
    --primary: #2980FE;
    --primary-soft: #EAF3FF;
    --primary-lighter: #F4F8FF;
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-500: #64748B;
    --gray-700: #334155;
    --gray-900: #0F172A;
    --shadow: 0 20px 60px rgba(15, 23, 42, .08);
    --soft-shadow: 0 12px 36px rgba(41, 128, 254, .10);
    --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
    color: var(--gray-900);
    background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 42%, #FFFFFF 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.section { padding: 56px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 5vw, 46px); line-height: 1.18; letter-spacing: -.03em; }
.section-lead { margin: 0 0 28px; color: var(--gray-500); font-size: 17px; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid rgba(41,128,254,.15);
    border-radius: 999px;
    padding: 7px 13px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(226,232,240,.9);
}
.nav-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    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: 800; color: var(--gray-900); white-space: nowrap; }
.brand img { width: 38px; height: 38px; border-radius: 12px; object-fit: contain; }
.nav-toggle { display: none; }
.nav-toggle-label { width: 44px; height: 44px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--gray-200); border-radius: 14px; background: var(--white); }
.nav-toggle-label span { display: block; width: 20px; height: 2px; background: var(--gray-700); border-radius: 99px; }
.site-nav {
    position: absolute;
    top: 72px;
    left: 14px;
    right: 14px;
    display: none;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: grid; }
.site-nav a {
    padding: 11px 13px;
    color: var(--gray-700);
    border-radius: 13px;
    font-size: 15px;
    font-weight: 700;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary); }
.nav-download { background: var(--primary) !important; color: var(--white) !important; text-align: center; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--white);
    font-weight: 800;
    box-shadow: 0 18px 36px rgba(41,128,254,.24);
    border: 1px solid rgba(41,128,254,.3);
    transition: transform .18s ease, box-shadow .18s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 24px 44px rgba(41,128,254,.30); }
.web3-hero { padding: 54px 0 34px; position: relative; overflow: hidden; }
.web3-hero::before {
    content: "";
    position: absolute;
    inset: -120px -120px auto auto;
    width: 360px;
    height: 360px;
    background: radial-gradient(circle, rgba(41,128,254,.18), rgba(41,128,254,0) 62%);
    pointer-events: none;
}
.hero-grid { display: grid; gap: 34px; align-items: center; }
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(38px, 9vw, 72px); line-height: 1.05; letter-spacing: -.055em; }
.hero-copy p { color: var(--gray-500); font-size: 18px; margin: 0 0 24px; max-width: 680px; }
.hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.security-tags, .floating-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.security-tags span, .floating-tags span, .mini-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 8px 12px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    color: var(--gray-700);
    font-size: 13px;
    font-weight: 700;
}
.hero-visual { position: relative; background: linear-gradient(145deg, #FFFFFF, #EEF6FF); border: 1px solid var(--gray-200); border-radius: 34px; padding: 24px; box-shadow: var(--soft-shadow); min-height: 360px; display: grid; place-items: center; overflow: hidden; }
.hero-visual::after { content: ""; position: absolute; inset: 16px; border: 1px solid rgba(41,128,254,.12); border-radius: 28px; }
.hero-visual img { max-height: 430px; object-fit: contain; position: relative; z-index: 1; filter: drop-shadow(0 28px 40px rgba(15,23,42,.14)); }
.floating-tags { position: relative; z-index: 2; justify-content: center; }
.ecosystem-nav { padding: 24px 0 54px; }
.ecosystem-grid, .category-grid { display: grid; gap: 16px; }
.ecosystem-card, .info-card, .risk-card, .faq-item, .step-card, .feature-card {
    background: rgba(255,255,255,.96);
    border: 1px solid var(--gray-200);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 14px 32px rgba(15,23,42,.05);
}
.ecosystem-card { min-height: 174px; position: relative; overflow: hidden; }
.ecosystem-card::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 4px; background: linear-gradient(90deg, var(--primary), rgba(41,128,254,.15)); }
.ecosystem-card strong, .info-card h3, .risk-card h3, .step-card h3, .feature-card h3 { display: block; margin: 0 0 8px; font-size: 19px; color: var(--gray-900); }
.ecosystem-card p, .info-card p, .risk-card p, .step-card p, .feature-card p { margin: 0 0 14px; color: var(--gray-500); }
.text-link { color: var(--primary); font-weight: 800; display: inline-flex; align-items: center; gap: 4px; }
.text-link::after { content: "→"; }
.split-section { padding: 64px 0; }
.split-card {
    display: grid;
    gap: 28px;
    align-items: center;
    padding: 26px;
    border: 1px solid var(--gray-200);
    border-radius: 32px;
    background: var(--white);
    box-shadow: var(--shadow);
}
.split-card.alt, .hardware-wallet-section .split-card, .submit-chain-section .split-card { background: linear-gradient(135deg, #F7FAFF, #FFFFFF); }
.visual-card {
    border-radius: 28px;
    background: linear-gradient(145deg, #F5F9FF, #FFFFFF);
    border: 1px solid var(--gray-200);
    min-height: 260px;
    display: grid;
    place-items: center;
    padding: 22px;
    overflow: hidden;
}
.visual-card img { max-height: 340px; object-fit: contain; filter: drop-shadow(0 24px 34px rgba(15,23,42,.12)); }
.check-list, .clean-list { padding: 0; margin: 18px 0 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .clean-list li { position: relative; padding-left: 28px; color: var(--gray-700); }
.check-list li::before, .clean-list li::before { content: ""; position: absolute; left: 0; top: 11px; width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 5px var(--primary-soft); }
.privacy-section, .developer-center-section { background: linear-gradient(180deg, #F8FBFF, #FFFFFF); }
.panel-grid { display: grid; gap: 16px; }
.safety-panel { border-radius: 28px; padding: 24px; background: linear-gradient(135deg, #FFFFFF, #F2F7FF); border: 1px solid rgba(41,128,254,.18); box-shadow: var(--soft-shadow); }
.safety-panel h3 { margin: 0 0 10px; }
.code-panel {
    border-radius: 28px;
    padding: 22px;
    background: #F8FAFC;
    border: 1px solid var(--gray-200);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: var(--gray-700);
    overflow: hidden;
}
.code-line { display: block; padding: 8px 0; border-bottom: 1px solid var(--gray-200); }
.code-line:last-child { border-bottom: 0; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 62px; }
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 20px;
    left: 22px;
    color: var(--primary);
    font-weight: 900;
    background: var(--primary-soft);
    border-radius: 999px;
    padding: 5px 11px;
}
.risk-grid { display: grid; gap: 16px; }
.risk-card { border-left: 4px solid var(--primary); }
.risk-card .suggest { color: var(--gray-700); font-weight: 700; margin: 8px 0 12px; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--gray-500); }
.cta-section { padding: 62px 0 76px; }
.cta-box { text-align: center; border-radius: 34px; padding: 44px 22px; background: linear-gradient(135deg, #F2F7FF, #FFFFFF); border: 1px solid rgba(41,128,254,.16); box-shadow: var(--soft-shadow); }
.cta-box h2 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 44px); }
.cta-box p { margin: 0 auto 24px; color: var(--gray-500); max-width: 680px; }
.page-hero { padding: 52px 0 26px; background: radial-gradient(circle at top right, rgba(41,128,254,.16), transparent 34%), linear-gradient(180deg, #FFFFFF, #F8FBFF); }
.page-hero h1 { margin: 0 0 14px; font-size: clamp(34px, 7vw, 58px); line-height: 1.08; letter-spacing: -.04em; }
.page-hero p { margin: 0; color: var(--gray-500); max-width: 760px; font-size: 18px; }
.content-layout { display: grid; gap: 22px; padding: 34px 0 72px; }
.article-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-card p { color: var(--gray-700); margin: 0 0 16px; }
.article-card h2 { margin: 26px 0 10px; font-size: 26px; }
.side-panel { display: grid; gap: 16px; align-self: start; }
.tip-box { background: linear-gradient(135deg, #F4F8FF, #FFFFFF); border: 1px solid rgba(41,128,254,.18); border-radius: 24px; padding: 20px; }
.tip-box h3 { margin: 0 0 10px; }
.download-area { margin-top: 24px; }
.download-steps { counter-reset: dl; display: grid; gap: 16px; margin-top: 26px; }
.download-step { background: var(--white); border: 1px solid var(--gray-200); border-radius: 24px; padding: 20px; }
.download-step::before { counter-increment: dl; content: counter(dl); display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--primary); color: var(--white); font-weight: 800; margin-bottom: 10px; }
.site-footer { background: #0F172A; color: #DDE7F6; padding-top: 48px; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { font-size: 22px; font-weight: 900; margin-bottom: 10px; color: var(--white); }
.site-footer p { color: #AAB8CF; margin: 0; max-width: 520px; }
.site-footer h3 { color: var(--white); margin: 0 0 12px; }
.site-footer a { display: block; color: #C8D5EA; margin: 7px 0; }
.footer-bottom { margin-top: 36px; padding: 18px; text-align: center; border-top: 1px solid rgba(255,255,255,.08); color: #93A4BC; font-size: 14px; }
@media (min-width: 640px) {
    .ecosystem-grid, .category-grid, .panel-grid, .risk-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 920px) {
    .nav-toggle-label { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 9px 11px; font-size: 14px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .hero-copy p { font-size: 20px; }
    .ecosystem-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); }
    .ecosystem-card { padding: 18px; min-height: 210px; }
    .ecosystem-card strong { font-size: 17px; }
    .split-card { grid-template-columns: 1.02fr .98fr; padding: 34px; }
    .split-card.reverse .visual-card { order: -1; }
    .panel-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 330px; align-items: start; }
    .footer-grid { grid-template-columns: 1.5fr .75fr .75fr; }
}
@media (min-width: 1100px) {
    .category-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .site-nav a { padding: 9px 13px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 26px, 1120px); }
    .download-btn { width: 100%; }
    .hero-actions { align-items: stretch; }
    .web3-hero { padding-top: 38px; }
    .split-card, .article-card { padding: 20px; border-radius: 24px; }
    .ecosystem-card, .info-card, .risk-card, .faq-item, .step-card { border-radius: 20px; }
}