:root {
    --primary: #2980FE;
    --primary-soft: #EAF3FF;
    --primary-lighter: #F4F8FF;
    --white: #ffffff;
    --gray-50: #f7f9fc;
    --gray-100: #eef2f7;
    --gray-200: #dfe6ef;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #111827;
    --shadow: 0 18px 45px rgba(17, 24, 39, .08);
    --shadow-soft: 0 12px 30px 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", "Microsoft JhengHei", Arial, sans-serif;
    color: var(--gray-900);
    background: linear-gradient(180deg, #fff 0%, #f8fbff 45%, #fff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
main { min-height: 70vh; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, .92);
    border-bottom: 1px solid var(--gray-100);
    backdrop-filter: blur(18px);
}
.nav-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
}
.logo, .footer-brand img { width: 36px; height: 36px; object-fit: contain; }
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.site-nav a {
    display: block;
    padding: 10px 12px;
    color: var(--gray-700);
    font-size: 15px;
    border-radius: 14px;
}
.site-nav a:hover, .site-nav a.active { color: var(--primary); background: var(--primary-soft); }
.nav-toggle { display: none; }
.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--gray-100);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
    background: var(--white);
}
.nav-toggle-label span { width: 18px; height: 2px; background: var(--gray-900); border-radius: 9px; display: block; }
.nav-toggle:checked ~ .site-nav { display: block; }
.content-container, .section-shell, .page-hero, .article-shell, .footer-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}
.launch-hero {
    position: relative;
    overflow: hidden;
    padding: 58px 0 34px;
    background:
        radial-gradient(circle at 80% 10%, rgba(41,128,254,.18), transparent 35%),
        linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
}
.launch-hero::before {
    content: "";
    position: absolute;
    width: 460px;
    height: 460px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .08);
    right: -180px;
    bottom: -200px;
}
.hero-grid {
    position: relative;
    display: grid;
    gap: 32px;
    align-items: center;
}
.eyebrow, .category-badge, .mini-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid rgba(41,128,254,.12);
    border-radius: 999px;
    padding: 7px 13px;
    font-weight: 700;
    font-size: 13px;
}
h1, h2, h3 { line-height: 1.2; margin: 0; color: var(--gray-900); }
h1 { font-size: clamp(34px, 9vw, 66px); letter-spacing: -.04em; margin-top: 18px; }
h2 { font-size: clamp(27px, 5vw, 42px); letter-spacing: -.03em; }
h3 { font-size: 21px; }
p { color: var(--gray-500); margin: 12px 0 0; }
.hero-copy p { font-size: 17px; max-width: 620px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 28px;
    border-radius: 999px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41,128,254,.24);
    border: 1px solid rgba(41,128,254,.35);
    transition: transform .2s ease, box-shadow .2s ease;
    cursor: pointer;
    white-space: nowrap;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 36px rgba(41,128,254,.28); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 24px; }
.security-tags, .hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.security-tags span, .hero-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    color: var(--gray-700);
    font-size: 13px;
    box-shadow: 0 8px 20px rgba(15,23,42,.04);
}
.hero-visual {
    position: relative;
    min-height: 440px;
    display: grid;
    place-items: center;
    padding: 26px;
    border-radius: 34px;
    background: linear-gradient(145deg, #ffffff, #edf5ff);
    border: 1px solid var(--gray-100);
    box-shadow: var(--shadow-soft);
}
.app-showcase {
    width: min(360px, 82vw);
    margin: 0 auto;
    filter: drop-shadow(0 28px 36px rgba(41,128,254,.16));
}
.float-chip {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 13px;
    border-radius: 999px;
    background: rgba(255,255,255,.9);
    border: 1px solid var(--gray-100);
    color: var(--gray-700);
    font-weight: 700;
    font-size: 13px;
    box-shadow: var(--shadow);
}
.float-chip::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); }
.chip-1 { top: 34px; left: 22px; }
.chip-2 { top: 110px; right: 18px; }
.chip-3 { bottom: 92px; left: 16px; }
.chip-4 { bottom: 34px; right: 24px; }
.section { padding: 46px 0; }
.section-head { margin-bottom: 24px; max-width: 760px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.highlight-bar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.highlight-card, .category-card, .risk-card, .faq-item, .step-card, .info-card, .side-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 24px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(15,23,42,.04);
}
.highlight-card strong {
    display: inline-flex;
    color: var(--primary);
    font-size: 13px;
    background: var(--primary-soft);
    padding: 4px 9px;
    border-radius: 999px;
    margin-bottom: 10px;
}
.highlight-card a, .text-link {
    display: inline-flex;
    margin-top: 12px;
    color: var(--primary);
    font-weight: 800;
}
.big-feature-card {
    display: grid;
    gap: 28px;
    align-items: center;
    padding: 24px;
    border-radius: 32px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    box-shadow: var(--shadow);
    margin-bottom: 22px;
    overflow: hidden;
}
.big-feature-card.alt { background: linear-gradient(135deg, #f7fbff 0%, #ffffff 70%); }
.big-feature-card .feature-image {
    min-height: 260px;
    display: grid;
    place-items: center;
    border-radius: 26px;
    background: linear-gradient(160deg, #f3f8ff, #ffffff);
    border: 1px solid var(--gray-100);
    padding: 24px;
}
.big-feature-card .feature-image img { max-height: 360px; object-fit: contain; filter: drop-shadow(0 20px 30px rgba(41,128,254,.13)); }
.feature-list, .check-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
}
.feature-list li, .check-list li {
    position: relative;
    padding-left: 26px;
    color: var(--gray-700);
}
.feature-list li::before, .check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 0 5px rgba(41,128,254,.12);
}
.process-steps, .risk-grid, .category-grid, .info-grid {
    display: grid;
    gap: 16px;
}
.step-card { position: relative; padding-top: 52px; }
.step-card .num {
    position: absolute;
    top: 18px;
    left: 20px;
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}
.risk-card { border-left: 4px solid var(--primary); }
.risk-card .suggest { margin-top: 10px; color: var(--gray-700); font-weight: 700; }
.app-category-center {
    padding: 28px;
    border-radius: 34px;
    background: linear-gradient(135deg, #f0f6ff, #ffffff);
    border: 1px solid var(--gray-100);
}
.category-card { min-height: 178px; }
.category-card h3 { display: flex; align-items: center; gap: 10px; }
.category-card h3::before {
    content: "";
    width: 11px;
    height: 11px;
    background: var(--primary);
    border-radius: 50%;
}
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    text-align: center;
    padding: 44px 22px;
    border-radius: 34px;
    background: radial-gradient(circle at 50% 0%, rgba(41,128,254,.18), transparent 38%), linear-gradient(180deg, #f4f8ff, #ffffff);
    border: 1px solid var(--gray-100);
}
.cta-section .download-btn { margin-top: 22px; }
.page-hero {
    padding: 54px 0 28px;
}
.page-hero-card {
    padding: 28px;
    border-radius: 34px;
    background: linear-gradient(135deg, #ffffff 0%, #f3f8ff 100%);
    border: 1px solid var(--gray-100);
    box-shadow: var(--shadow-soft);
}
.page-hero h1 { font-size: clamp(32px, 7vw, 54px); }
.article-shell {
    display: grid;
    gap: 22px;
    padding-bottom: 48px;
}
.article-main {
    background: #fff;
    border: 1px solid var(--gray-100);
    border-radius: 30px;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(15,23,42,.04);
}
.article-main section + section { margin-top: 28px; }
.article-main h2 { font-size: 27px; }
.article-main p { font-size: 16px; }
.side-panel { display: grid; gap: 16px; }
.side-card h3 { font-size: 18px; }
.notice-box {
    padding: 18px;
    border-radius: 22px;
    background: var(--primary-soft);
    border: 1px solid rgba(41,128,254,.15);
    color: var(--gray-700);
    margin-top: 18px;
}
.download-page-steps { counter-reset: step; display: grid; gap: 14px; }
.download-page-steps li {
    counter-increment: step;
    list-style: none;
    padding: 16px 18px 16px 56px;
    border: 1px solid var(--gray-100);
    border-radius: 20px;
    background: var(--white);
    position: relative;
    color: var(--gray-700);
}
.download-page-steps li::before {
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 14px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    font-weight: 800;
}
.site-footer {
    background: #fff;
    border-top: 1px solid var(--gray-100);
    padding: 34px 0 18px;
}
.footer-shell {
    display: grid;
    gap: 24px;
}
.footer-shell p { max-width: 520px; }
.footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.footer-links a { color: var(--gray-700); font-weight: 700; }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 26px auto 0;
    color: var(--gray-500);
    font-size: 13px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
}
@media (min-width: 640px) {
    .highlight-bar { grid-template-columns: repeat(2, 1fr); }
    .risk-grid, .category-grid, .info-grid, .process-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-links { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        display: flex;
        position: static;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
        align-items: center;
        justify-content: flex-end;
    }
    .site-nav a { padding: 8px 10px; font-size: 14px; }
    .launch-hero { padding: 88px 0 54px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; gap: 54px; }
    .hero-visual { min-height: 560px; }
    .section { padding: 64px 0; }
    .highlight-bar { grid-template-columns: repeat(3, 1fr); }
    .big-feature-card { grid-template-columns: 1fr 1fr; padding: 34px; }
    .big-feature-card.reverse .feature-content { order: 2; }
    .big-feature-card.reverse .feature-image { order: 1; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .article-shell { grid-template-columns: minmax(0, 1fr) 330px; align-items: start; }
    .article-main { padding: 34px; }
    .footer-shell { grid-template-columns: 1.2fr .8fr; align-items: start; }
}
@media (min-width: 1160px) {
    .site-nav a { padding: 9px 13px; font-size: 15px; }
}