:root {
    --primary: #2980FE;
    --primary-dark: #1268DF;
    --primary-soft: #EAF3FF;
    --primary-light: #F4F9FF;
    --white: #FFFFFF;
    --gray-50: #F7F9FC;
    --gray-100: #EEF2F7;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-600: #5F6B7A;
    --gray-700: #344054;
    --gray-900: #111827;
    --radius-xl: 24px;
    --radius-lg: 18px;
    --shadow-soft: 0 18px 48px rgba(16, 38, 84, 0.08);
    --shadow-card: 0 12px 28px rgba(32, 60, 107, 0.08);
}

* {
    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: 1.75;
    overflow-x: hidden;
}

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

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

p {
    color: var(--gray-600);
    margin: 0 0 16px;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 16px;
    color: var(--gray-900);
}

h1 {
    font-size: clamp(2.25rem, 8vw, 4.65rem);
    letter-spacing: -0.06em;
}

h2 {
    font-size: clamp(1.75rem, 5vw, 3rem);
    letter-spacing: -0.04em;
}

h3 {
    font-size: 1.15rem;
}

ul, ol {
    margin: 0;
    padding-left: 20px;
}

li {
    margin: 8px 0;
    color: var(--gray-600);
}

main {
    min-height: 70vh;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo,
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.03em;
}

.logo img,
.footer-logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 20px;
    padding: 12px;
    box-shadow: var(--shadow-card);
}

.site-nav.is-open {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: var(--gray-700);
    font-size: 0.95rem;
}

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

.nav-toggle {
    display: inline-grid;
    gap: 4px;
    border: 0;
    background: var(--gray-50);
    border-radius: 14px;
    padding: 11px;
    cursor: pointer;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--gray-900);
    border-radius: 99px;
}

.container,
.content-container,
.section-head,
.footer-inner {
    width: min(100% - 36px, 1180px);
    margin-inline: auto;
}

.content-container {
    padding: 56px 0;
}

.narrow-container {
    width: min(100% - 36px, 900px);
    margin-inline: auto;
    padding: 56px 0;
}

.portal-hero {
    position: relative;
    overflow: hidden;
    padding: 52px 0 34px;
    background:
        radial-gradient(circle at 90% 5%, rgba(41,128,254,0.18), transparent 34%),
        linear-gradient(135deg, #FFFFFF 0%, #F2F7FF 72%, #EAF3FF 100%);
}

.portal-hero::before {
    content: "";
    position: absolute;
    width: 380px;
    height: 380px;
    right: -170px;
    bottom: -170px;
    background: rgba(41,128,254,0.16);
    border-radius: 50%;
}

.hero-inner {
    width: min(100% - 36px, 1180px);
    margin-inline: auto;
    display: grid;
    gap: 38px;
    align-items: center;
    position: relative;
}

.hero-copy {
    max-width: 650px;
}

.eyebrow,
.category-badge,
.mini-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid rgba(41, 128, 254, 0.16);
    border-radius: 999px;
    padding: 7px 12px;
    font-weight: 700;
    font-size: 0.84rem;
    margin-bottom: 16px;
}

.hero-copy p {
    font-size: 1.05rem;
    max-width: 620px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--white);
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, 0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 34px rgba(41, 128, 254, 0.32);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 26px;
}

.safe-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.safe-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--gray-200);
    color: var(--gray-700);
    font-size: 0.9rem;
}

.hero-visual {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 360px;
}

.phone-frame {
    width: min(88vw, 390px);
    border-radius: 34px;
    padding: 12px;
    background: linear-gradient(145deg, #FFFFFF, #EAF3FF);
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(41,128,254,0.12);
}

.phone-frame img {
    border-radius: 28px;
    margin: auto;
}

.float-card {
    position: absolute;
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(226,232,240,0.9);
    box-shadow: var(--shadow-card);
    border-radius: 18px;
    padding: 14px;
    min-width: 142px;
}

.float-card strong {
    display: block;
    font-size: 1.05rem;
}

.float-card span {
    color: var(--gray-600);
    font-size: 0.85rem;
}

.float-card.asset {
    left: 0;
    bottom: 34px;
}

.float-card.cold {
    right: 0;
    top: 40px;
}

.float-card.swap {
    right: 8px;
    bottom: 76px;
}

.float-card.dapp {
    left: 6px;
    top: 40px;
}

.channel-strip {
    width: min(100% - 36px, 1180px);
    margin: -18px auto 0;
    position: relative;
    z-index: 2;
}

.channel-nav,
.category-grid,
.risk-grid,
.feature-card-grid,
.faq-grid,
.info-grid,
.page-grid,
.process-steps {
    display: grid;
    gap: 16px;
}

.channel-card,
.category-card,
.risk-card,
.feature-card,
.faq-item,
.info-card,
.step-card,
.note-card,
.side-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.channel-card {
    padding: 18px;
}

.channel-card small {
    display: inline-flex;
    color: var(--primary);
    font-weight: 800;
    margin-bottom: 10px;
}

.channel-card h3,
.category-card h3,
.risk-card h3,
.feature-card h3,
.info-card h3,
.step-card h3,
.note-card h3,
.side-card h3 {
    margin-bottom: 8px;
}

.text-link {
    display: inline-flex;
    color: var(--primary);
    font-weight: 800;
    margin-top: 10px;
}

.section-head {
    padding-top: 70px;
    margin-bottom: 24px;
}

.section-head.center {
    text-align: center;
}

.section-head p {
    max-width: 760px;
}

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

.split-feature {
    width: min(100% - 36px, 1180px);
    margin: 42px auto;
    display: grid;
    gap: 24px;
    align-items: center;
    padding: 24px;
    border-radius: 30px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-soft);
}

.split-feature.soft {
    background: linear-gradient(135deg, #F7FBFF 0%, #FFFFFF 100%);
}

.split-feature.reverse .feature-media {
    order: -1;
}

.feature-copy {
    padding: 6px;
}

.feature-points {
    display: grid;
    gap: 10px;
    margin: 18px 0;
}

.feature-points span,
.check-list span {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--gray-700);
}

.feature-points span::before,
.check-list span::before {
    content: "";
    flex: 0 0 9px;
    width: 9px;
    height: 9px;
    margin-top: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(41,128,254,0.12);
}

.feature-media {
    display: grid;
    place-items: center;
    min-height: 280px;
    border-radius: 26px;
    background:
        radial-gradient(circle at 20% 10%, rgba(41,128,254,0.15), transparent 35%),
        linear-gradient(160deg, #F6FAFF, #FFFFFF);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.feature-media img {
    width: min(100%, 440px);
    padding: 18px;
}

.wallet-split .feature-media,
.swap-split .feature-media {
    background: linear-gradient(145deg, #F7FAFF, #FFFFFF);
}

.cold-wallet-split {
    background: linear-gradient(135deg, #F1F7FF 0%, #FFFFFF 100%);
}

.dapp-split .feature-media {
    background: linear-gradient(145deg, #FFFFFF, #EDF5FF);
}

.safety-panel {
    width: min(100% - 36px, 1180px);
    margin: 48px auto;
    padding: 28px;
    border-radius: 30px;
    background: linear-gradient(135deg, #F4F9FF, #FFFFFF);
    border: 1px solid var(--gray-200);
}

.safety-panel .risk-grid {
    margin-top: 22px;
}

.risk-card {
    padding: 18px;
    border-left: 4px solid var(--primary);
}

.risk-card .risk-name {
    display: inline-flex;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 800;
    margin-bottom: 8px;
}

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

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

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    display: inline-grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--primary);
    color: var(--white);
    font-weight: 900;
    margin-bottom: 14px;
}

.category-card,
.feature-card,
.info-card,
.note-card,
.side-card {
    padding: 22px;
}

.category-card {
    min-height: 190px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.category-card .mini-label {
    width: fit-content;
    margin-bottom: 12px;
    padding: 5px 10px;
}

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    color: var(--gray-900);
}

.cta-section {
    width: min(100% - 36px, 1180px);
    margin: 64px auto 76px;
    padding: clamp(28px, 7vw, 58px);
    text-align: center;
    border-radius: 34px;
    background:
        radial-gradient(circle at 12% 10%, rgba(41,128,254,0.16), transparent 38%),
        linear-gradient(135deg, #F4F9FF 0%, #FFFFFF 100%);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-soft);
}

.cta-section p {
    max-width: 720px;
    margin: 0 auto 24px;
}

.page-hero {
    padding: 56px 0 28px;
    background:
        radial-gradient(circle at 86% 2%, rgba(41,128,254,0.18), transparent 32%),
        linear-gradient(135deg, #FFFFFF 0%, #F3F8FF 100%);
    border-bottom: 1px solid var(--gray-200);
}

.page-hero-inner {
    width: min(100% - 36px, 1020px);
    margin-inline: auto;
}

.page-hero h1 {
    font-size: clamp(2rem, 7vw, 4rem);
    max-width: 860px;
}

.page-hero p {
    font-size: 1.05rem;
    max-width: 780px;
}

.page-grid {
    width: min(100% - 36px, 1180px);
    margin: 40px auto 70px;
}

.article-body {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 28px;
    padding: clamp(22px, 5vw, 42px);
    box-shadow: var(--shadow-card);
}

.article-body h2 {
    margin-top: 22px;
    font-size: clamp(1.45rem, 4vw, 2.2rem);
}

.article-body .download-btn {
    margin-top: 20px;
}

.sidebar {
    display: grid;
    gap: 16px;
    align-content: start;
}

.note-card.blue {
    background: var(--primary-soft);
    border-color: rgba(41,128,254,0.16);
}

.check-list {
    display: grid;
    gap: 10px;
    margin: 16px 0;
}

.download-steps {
    display: grid;
    gap: 14px;
    margin: 24px 0;
    padding: 0;
    list-style: none;
    counter-reset: dstep;
}

.download-steps li {
    margin: 0;
    padding: 18px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 18px;
    color: var(--gray-700);
}

.download-steps li::before {
    counter-increment: dstep;
    content: counter(dstep);
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    margin-right: 10px;
    border-radius: 10px;
    background: var(--primary);
    color: var(--white);
    font-weight: 800;
}

.faq-list {
    display: grid;
    gap: 16px;
}

.about-panel {
    display: grid;
    gap: 20px;
}

.site-footer {
    background: #F8FAFC;
    border-top: 1px solid var(--gray-200);
}

.footer-inner {
    padding: 46px 18px;
    display: grid;
    gap: 28px;
}

.footer-brand p {
    max-width: 450px;
    margin-top: 14px;
}

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

.footer-links h3 {
    font-size: 0.98rem;
    margin-bottom: 10px;
}

.footer-links a {
    display: block;
    color: var(--gray-600);
    margin: 8px 0;
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-200);
    padding: 16px 18px;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.9rem;
}

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

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

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

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

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

    .site-nav a {
        padding: 9px 10px;
        font-size: 0.92rem;
    }

    .hero-inner {
        grid-template-columns: 1.02fr 0.98fr;
    }

    .portal-hero {
        padding: 76px 0 50px;
    }

    .channel-nav {
        grid-template-columns: repeat(6, minmax(0, 1fr));
    }

    .split-feature {
        grid-template-columns: 1fr 1fr;
        padding: 34px;
        margin: 54px auto;
    }

    .split-feature.reverse .feature-media {
        order: 2;
    }

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

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

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

    .page-grid {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .footer-inner {
        grid-template-columns: 1.1fr 1.6fr;
    }
}

@media (min-width: 1180px) {
    .site-nav a {
        padding: 10px 12px;
    }
}

@media (max-width: 420px) {
    .container,
    .content-container,
    .section-head,
    .footer-inner,
    .narrow-container,
    .hero-inner,
    .channel-strip,
    .split-feature,
    .safety-panel,
    .cta-section,
    .page-grid,
    .page-hero-inner {
        width: min(100% - 28px, 1180px);
    }

    .hero-actions {
        align-items: stretch;
    }

    .download-btn {
        width: 100%;
    }

    .site-nav.is-open {
        grid-template-columns: 1fr;
    }

    .float-card {
        position: static;
        width: 100%;
        margin: 8px 0 0;
    }

    .hero-visual {
        display: block;
    }

    .phone-frame {
        width: 100%;
    }
}