/* Mobile-first responsive product website */
:root {
    --primary: #2980FE;
    --primary-dark: #0f61d6;
    --primary-soft: #eef6ff;
    --primary-softer: #f6faff;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #eef2f7;
    --gray-200: #dbe4ef;
    --gray-300: #c7d0dd;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #111827;
    --radius-lg: 22px;
    --radius-md: 16px;
    --shadow-card: 0 16px 38px rgba(21, 56, 103, .08);
    --shadow-soft: 0 10px 28px rgba(41, 128, 254, .12);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--gray-700);
    background: var(--white);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-100);
}

.nav-wrap {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -.02em;
}

.brand img,
.footer-brand img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.nav-toggle {
    display: inline-flex;
    width: 44px;
    height: 44px;
    border: 1px solid var(--gray-200);
    border-radius: 14px;
    background: var(--white);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 20px;
    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: 12px;
    color: var(--gray-700);
    font-weight: 600;
    font-size: 14px;
}

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

.hero-shell,
.page-hero {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(circle at 85% 15%, rgba(41,128,254,.18), transparent 32%),
        linear-gradient(180deg, var(--primary-softer), var(--white) 62%);
}

.product-hero {
    display: grid;
    gap: 34px;
    padding: 56px 0 36px;
    align-items: center;
}

.kicker,
.category-badge {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 14px;
}

h1,
h2,
h3 {
    color: var(--gray-900);
    line-height: 1.22;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
    letter-spacing: -.045em;
}

h2 {
    font-size: clamp(26px, 5vw, 38px);
    letter-spacing: -.035em;
}

h3 {
    font-size: 20px;
    letter-spacing: -.02em;
}

.lead {
    font-size: 17px;
    color: var(--gray-500);
    margin: 0 0 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--white);
    font-weight: 800;
    box-shadow: var(--shadow-soft);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(41,128,254,.20);
}

.hero-tags,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.hero-tags span,
.tag-row span,
.blue-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    color: var(--gray-700);
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}

.app-visual {
    position: relative;
    min-height: 360px;
    padding: 20px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.88), rgba(238,246,255,.96));
    border: 1px solid rgba(41,128,254,.12);
    box-shadow: var(--shadow-card);
}

.app-visual-main {
    width: min(86%, 360px);
    margin: 0 auto;
    filter: drop-shadow(0 18px 32px rgba(33, 88, 163, .16));
}

.float-card {
    position: absolute;
    background: rgba(255,255,255,.94);
    border: 1px solid var(--gray-100);
    border-radius: 18px;
    box-shadow: var(--shadow-card);
    padding: 12px 14px;
    font-size: 13px;
    color: var(--gray-500);
}

.float-card strong {
    display: block;
    color: var(--gray-900);
    font-size: 15px;
}

.float-card.assets {
    left: 18px;
    top: 22px;
}

.float-card.cold {
    right: 18px;
    top: 82px;
}

.float-card.swap {
    left: 22px;
    bottom: 54px;
}

.float-card.dapp {
    right: 18px;
    bottom: 18px;
}

.section {
    padding: 54px 0;
}

.section-muted {
    background: var(--gray-50);
}

.section-blue {
    background: linear-gradient(180deg, var(--primary-softer), var(--white));
}

.section-title {
    max-width: 760px;
    margin-bottom: 28px;
}

.feature-shortcuts,
.category-grid,
.risk-grid,
.faq-grid,
.card-grid {
    display: grid;
    gap: 16px;
}

.feature-shortcuts {
    grid-template-columns: 1fr;
}

.feature-card,
.category-card,
.risk-card,
.faq-item,
.info-card,
.check-card,
.article-panel {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(30,64,100,.05);
}

.feature-card .icon-dot,
.category-card .icon-dot {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 900;
    margin-bottom: 12px;
}

.feature-card a,
.category-card a,
.inline-link,
.step-card a,
.risk-card a,
.related-list a {
    color: var(--primary);
    font-weight: 800;
}

.product-section,
.split-section {
    display: grid;
    gap: 28px;
    align-items: center;
}

.product-media {
    border-radius: 28px;
    border: 1px solid var(--gray-100);
    background: var(--white);
    box-shadow: var(--shadow-card);
    padding: 18px;
}

.product-media.blue {
    background: linear-gradient(145deg, #eef6ff, #ffffff);
}

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

.check-list li {
    position: relative;
    padding-left: 28px;
    color: var(--gray-700);
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-weight: 900;
}

.process-steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.step-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(30,64,100,.05);
}

.step-card .step-num {
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary);
    color: var(--white);
    font-weight: 900;
    margin-bottom: 12px;
}

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

.risk-card small {
    display: block;
    color: var(--gray-500);
    margin-top: 8px;
}

.cta-section {
    padding: 56px 0;
    background:
        radial-gradient(circle at top right, rgba(41,128,254,.18), transparent 34%),
        linear-gradient(135deg, #f6faff, #eef6ff);
}

.cta-box {
    text-align: center;
    border: 1px solid rgba(41,128,254,.14);
    background: rgba(255,255,255,.78);
    border-radius: 30px;
    padding: 34px 22px;
    box-shadow: var(--shadow-card);
}

.page-hero .container {
    padding: 44px 0 28px;
}

.breadcrumb {
    color: var(--gray-500);
    font-size: 14px;
    margin-bottom: 12px;
}

.article-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}

.article-main {
    display: grid;
    gap: 18px;
}

.article-main p {
    margin: 0;
}

.article-panel h2,
.article-panel h3 {
    margin-bottom: 10px;
}

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

.notice-box {
    border-radius: var(--radius-lg);
    background: var(--primary-soft);
    border: 1px solid rgba(41,128,254,.16);
    padding: 20px;
}

.notice-box strong {
    color: var(--gray-900);
}

.dl-steps {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}

.dl-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 18px;
    padding: 16px;
}

.dl-step span {
    flex: 0 0 32px;
    width: 32px;
    height: 32px;
    border-radius: 11px;
    background: var(--primary);
    color: var(--white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

.faq-item details {
    margin: 0;
}

.faq-item summary {
    cursor: pointer;
    color: var(--gray-900);
    font-weight: 800;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    margin: 12px 0 0;
    color: var(--gray-500);
}

.site-footer {
    background: #f6f8fb;
    border-top: 1px solid var(--gray-100);
    padding: 44px 0 22px;
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.site-footer h3 {
    font-size: 16px;
    margin-bottom: 12px;
}

.site-footer a {
    display: block;
    color: var(--gray-500);
    margin: 7px 0;
}

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

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--gray-200);
    display: grid;
    gap: 8px;
    color: var(--gray-500);
    font-size: 13px;
}

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

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

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

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

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

    .site-nav a {
        font-size: 14px;
        white-space: nowrap;
    }

    .product-hero {
        grid-template-columns: 1.04fr .96fr;
        padding: 76px 0 56px;
    }

    .product-section,
    .split-section {
        grid-template-columns: 1fr 1fr;
        gap: 52px;
    }

    .feature-shortcuts {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        gap: 30px;
    }

    .article-main {
        max-width: 780px;
    }

    .article-aside {
        position: sticky;
        top: 92px;
    }

    .section {
        padding: 76px 0;
    }

    .cta-box {
        padding: 52px;
    }
}

@media (min-width: 1120px) {
    .feature-shortcuts {
        grid-template-columns: repeat(6, 1fr);
    }
}