:root {
    --ink: #17203a;
    --muted: #68718a;
    --blue: #246bfe;
    --blue-deep: #1547d8;
    --violet: #7c3cff;
    --cyan: #00bcd4;
    --pink: #e53ff2;
    --line: #e6eaf4;
    --surface: #f6f8fe;
    --white: #fff;
    --shadow: 0 24px 70px rgba(41, 64, 126, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--white);
    font-family: Inter, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.narrow { width: min(800px, 100%); }
.muted { color: var(--muted); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.86);
    border-bottom: 1px solid rgba(224,228,241,.8);
    backdrop-filter: blur(18px);
}
.nav-shell { height: 76px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 22px; font-weight: 800; letter-spacing: -.5px; }
.brand img { width: 42px; height: 42px; border-radius: 12px; box-shadow: 0 8px 20px rgba(68,63,230,.2); }
.site-nav { display: flex; align-items: center; gap: 30px; color: #424b65; font-size: 15px; }
.site-nav a { transition: color .2s; }
.site-nav a:hover { color: var(--blue); }
.menu-button { display: none; border: 0; background: transparent; color: var(--ink); }

.hero {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(circle at 82% 18%, rgba(0,210,255,.18), transparent 25%),
        radial-gradient(circle at 67% 62%, rgba(152,64,255,.16), transparent 28%),
        linear-gradient(155deg, #f8fbff 0%, #f5f3ff 62%, #fff 100%);
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: .28;
    background-image: linear-gradient(rgba(74,94,150,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(74,94,150,.08) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: linear-gradient(to bottom, black, transparent 80%);
}
.hero-grid { position: relative; min-height: 650px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 70px; }
.eyebrow { display: inline-block; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.hero h1 { max-width: 680px; margin: 18px 0 22px; font-size: clamp(48px, 5vw, 72px); line-height: 1.08; letter-spacing: -.055em; }
.hero h1 span { background: linear-gradient(110deg, var(--blue), var(--violet) 58%, var(--pink)); -webkit-background-clip: text; color: transparent; }
.hero-copy > p { max-width: 640px; margin: 0; color: var(--muted); font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; min-height: 48px; padding: 0 24px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 13px; font-weight: 700; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover:not(.disabled) { transform: translateY(-2px); }
.button.primary { color: #fff; background: linear-gradient(110deg, var(--blue), var(--violet)); box-shadow: 0 14px 30px rgba(56,73,226,.25); }
.button.secondary { color: var(--ink); background: #fff; border-color: var(--line); box-shadow: 0 8px 22px rgba(31,53,114,.08); }
.button.disabled { color: #8f97aa; background: #e9ecf3; cursor: not-allowed; }
.button.full { width: 100%; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 28px; color: #66708b; font-size: 13px; }
.hero-notes span::before { content: "✓"; margin-right: 7px; color: #00a99d; font-weight: 900; }

.hero-visual { position: relative; min-height: 430px; }
.glow { position: absolute; inset: 65px 40px; border-radius: 50%; background: linear-gradient(135deg, rgba(0,203,255,.28), rgba(117,61,255,.34)); filter: blur(48px); }
.app-card { position: absolute; display: flex; align-items: center; gap: 13px; width: 360px; padding: 20px; border: 1px solid rgba(255,255,255,.8); border-radius: 20px; background: rgba(255,255,255,.88); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.app-card strong, .app-card small { display: block; }
.app-card small { margin-top: 2px; color: var(--muted); }
.app-card img { width: 54px; height: 54px; border-radius: 15px; }
.card-main { z-index: 3; top: 157px; left: 20px; width: 410px; padding: 24px; transform: rotate(-1deg); }
.card-back { z-index: 1; top: 63px; left: 76px; transform: rotate(5deg); }
.card-front { z-index: 2; top: 278px; left: 100px; transform: rotate(3deg); }
.state { margin-left: auto; padding: 6px 10px; border-radius: 99px; color: #087d69; background: #e0faf4; font-size: 12px; font-weight: 800; }
.dot { width: 42px; height: 42px; flex: 0 0 auto; border-radius: 13px; }
.dot.cyan { background: linear-gradient(135deg, #10d8e4, #236bfe); }
.dot.violet { background: linear-gradient(135deg, #7745ff, #f044d7); }

.section { padding: 100px 0; }
.section-soft { background: var(--surface); }
.section-heading { max-width: 720px; margin-bottom: 48px; }
.section-heading h2, .split-callout h2 { margin: 12px 0; font-size: clamp(34px, 4vw, 48px); line-height: 1.17; letter-spacing: -.035em; }
.section-heading p, .split-callout p { margin: 0; color: var(--muted); font-size: 18px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card { min-height: 250px; padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 12px 30px rgba(31,54,115,.06); }
.feature-icon { display: inline-grid; width: 44px; height: 44px; place-items: center; border-radius: 13px; color: #fff; font-weight: 900; }
.feature-card.blue .feature-icon { background: linear-gradient(135deg, #0f91ff, #2948ff); }
.feature-card.violet .feature-icon { background: linear-gradient(135deg, #7549ff, #a832ff); }
.feature-card.cyan .feature-icon { background: linear-gradient(135deg, #00c8c0, #0c90ff); }
.feature-card.pink .feature-icon { background: linear-gradient(135deg, #f04eb8, #7c3cff); }
.feature-card h3 { margin: 48px 0 8px; font-size: 22px; }
.feature-card p { margin: 0; color: var(--muted); }
.split-callout { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.split-callout > div { max-width: 760px; }

.page-hero { background: linear-gradient(145deg, #f4f8ff, #f4f0ff); }
.page-hero.compact { padding: 100px 0 80px; text-align: center; }
.page-hero h1 { margin: 12px 0 16px; font-size: clamp(42px, 5vw, 62px); line-height: 1.12; letter-spacing: -.045em; }
.page-hero p { margin: 0 auto 28px; color: var(--muted); font-size: 19px; }
.capability-list { max-width: 900px; }
.capability-list article { display: grid; grid-template-columns: 70px 1fr; gap: 28px; padding: 36px 0; border-bottom: 1px solid var(--line); }
.capability-number { color: var(--blue); font-size: 14px; font-weight: 900; }
.capability-list h2 { margin: 0 0 8px; font-size: 27px; }
.capability-list p { margin: 0; color: var(--muted); font-size: 17px; }
.notice-section { padding: 0 0 90px; }
.notice-card { padding: 25px 28px; border: 1px solid #d8e5ff; border-radius: 17px; background: #f2f7ff; }
.notice-card p { display: inline; margin-left: 12px; color: var(--muted); }

.pricing-wrap { display: flex; justify-content: center; }
.pricing-card { width: min(500px, 100%); padding: 38px; border: 1px solid var(--line); border-radius: 26px; background: #fff; box-shadow: var(--shadow); }
.pricing-card.featured { border-top: 4px solid var(--violet); }
.pricing-badge { display: inline-block; padding: 6px 10px; border-radius: 99px; color: #6330d7; background: #f0eaff; font-size: 12px; font-weight: 800; }
.pricing-card h2 { margin: 22px 0 5px; font-size: 28px; }
.price { margin-bottom: 24px; font-size: 42px; font-weight: 900; }
.pricing-card ul { margin: 0 0 30px; padding: 0; list-style: none; }
.pricing-card li { padding: 9px 0; border-bottom: 1px solid #eff1f6; }
.pricing-card li::before { content: "✓"; margin-right: 10px; color: #00a38f; font-weight: 900; }

.download-panel { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; padding: 38px; border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 16px 50px rgba(31,54,115,.08); }
.download-panel img { width: 92px; height: 92px; border-radius: 23px; }
.download-panel h2 { margin: 0; font-size: 28px; }
.download-panel p { margin: 5px 0 13px; color: var(--muted); }
.requirements { display: flex; flex-wrap: wrap; gap: 8px; }
.requirements span { padding: 5px 10px; border-radius: 99px; color: #526079; background: #f0f3f9; font-size: 12px; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.contact-card { padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.contact-card span { display: block; margin-bottom: 13px; color: var(--muted); font-size: 13px; }
.contact-card strong { font-size: 17px; word-break: break-word; }
.contact-card a { color: var(--blue); }

.legal-page { padding: 90px 0 110px; background: #fbfcff; }
.legal-copy { max-width: 820px; padding: 52px 62px; border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: 0 15px 50px rgba(31,54,115,.06); }
.legal-copy h1 { margin: 10px 0 0; font-size: 44px; letter-spacing: -.035em; }
.legal-copy .updated { margin: 2px 0 45px; color: var(--muted); }
.legal-copy h2 { margin: 34px 0 8px; font-size: 21px; }
.legal-copy p { margin: 0; color: #525d75; }

.site-footer { color: #c7cee0; background: #12182a; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 70px; padding: 70px 0 50px; }
.footer-brand { color: #fff; font-size: 25px; font-weight: 900; }
.footer-grid p { max-width: 430px; color: #8e98b4; }
.footer-grid h2 { margin: 0 0 15px; color: #fff; font-size: 14px; }
.footer-grid a { display: block; margin: 9px 0; color: #9da7c0; font-size: 14px; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding: 24px 0 30px; border-top: 1px solid #262e43; font-size: 13px; }

@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; padding: 90px 0 70px; }
    .hero-visual { width: min(500px, 100%); margin: -35px auto 0; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .download-panel { grid-template-columns: auto 1fr; }
    .download-panel .button { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
    .shell { width: min(100% - 28px, 1160px); }
    .nav-shell { height: 66px; }
    .brand img { width: 36px; height: 36px; }
    .menu-button { display: block; }
    .site-nav { display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 18px 20px 24px; flex-direction: column; align-items: stretch; gap: 5px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 15px 30px rgba(31,54,115,.08); }
    .site-nav.open { display: flex; }
    .site-nav a { padding: 10px 12px; border-radius: 8px; }
    .site-nav a:hover { background: var(--surface); }
    .hero-grid { min-height: auto; gap: 55px; }
    .hero h1 { font-size: 43px; }
    .hero-copy > p { font-size: 17px; }
    .hero-visual { min-height: 340px; transform: scale(.83); transform-origin: left top; width: 120%; }
    .card-main { left: 0; }
    .card-back { left: 28px; }
    .card-front { left: 42px; }
    .section { padding: 75px 0; }
    .feature-grid { grid-template-columns: 1fr; }
    .feature-card { min-height: 220px; }
    .split-callout { align-items: flex-start; flex-direction: column; }
    .page-hero.compact { padding: 72px 0 55px; }
    .page-hero h1 { font-size: 40px; }
    .capability-list article { grid-template-columns: 42px 1fr; gap: 10px; }
    .download-panel { grid-template-columns: 1fr; text-align: center; }
    .download-panel img { margin: auto; }
    .requirements { justify-content: center; }
    .legal-page { padding: 45px 0 70px; }
    .legal-copy { padding: 34px 24px; }
    .legal-copy h1 { font-size: 36px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 55px 0 35px; }
    .footer-bottom { flex-direction: column; }
}