* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: #10172a;
    background: #ffffff;
    font-family:
        Arial,
        "Microsoft YaHei",
        "PingFang SC",
        sans-serif;
    line-height: 1.75;
}

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

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

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

/* =========================
   HEADER
   ========================= */

.site-header {
    background: #08101f;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.header-inner {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.brand {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.brand img {
    width: auto !important;
    height: auto !important;
    max-width: 188px !important;
    max-height: 52px !important;
    object-fit: contain !important;
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
    color: #dce5f5;
    font-size: 15px;
}

.nav a:hover {
    color: #ffffff;
}

.header-download {
    padding: 11px 20px;
    border-radius: 999px;
    color: #07101c !important;
    background: #ffffff;
    font-weight: 700;
}

/* =========================
   HERO
   ========================= */

.hero {
    position: relative;
    overflow: hidden;
    padding: 82px 0 74px;
    color: #ffffff;
    background:
        radial-gradient(circle at 78% 20%, rgba(51,84,255,.28), transparent 30%),
        linear-gradient(135deg, #07101f 0%, #11183b 52%, #18102c 100%);
}

.hero::after {
    content: "";
    position: absolute;
    inset: auto -100px -180px auto;
    width: 430px;
    height: 430px;
    border-radius: 50%;
    background: rgba(227,0,75,.14);
    filter: blur(20px);
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, .95fr) minmax(420px, 1.05fr);
    align-items: center;
    gap: 70px;
}

.eyebrow {
    margin: 0 0 12px;
    color: #7da9ff;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    max-width: 650px;
    font-size: clamp(42px, 5vw, 68px);
    line-height: 1.08;
    letter-spacing: -.035em;
}

.hero-copy {
    max-width: 650px;
    margin: 24px 0 0;
    color: #c8d2e7;
    font-size: 18px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 32px;
}

.btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    border-radius: 12px;
    font-weight: 800;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, #e8004f, #ff3c72);
    box-shadow: 0 16px 40px rgba(232,0,79,.22);
}

.btn-secondary {
    color: #fff;
    border: 1px solid rgba(255,255,255,.22);
    background: rgba(255,255,255,.06);
}

.hero-visual {
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.13);
    border-radius: 28px;
    background: rgba(255,255,255,.05);
    box-shadow: 0 30px 80px rgba(0,0,0,.32);
}

.hero-visual img {
    width: 100%;
    height: 470px;
    object-fit: contain;
}

/* =========================
   IMAGE INTRO
   ========================= */

.visual-intro {
    padding: 70px 0;
    background: #f6f8fc;
}

.section-head {
    max-width: 760px;
    margin-bottom: 34px;
}

.section-head h2 {
    margin: 0;
    font-size: clamp(30px, 4vw, 45px);
    line-height: 1.2;
    letter-spacing: -.025em;
}

.section-head p {
    margin: 14px 0 0;
    color: #59647a;
}

.image-grid {
    display: grid;
    grid-template-columns: 1.25fr .75fr .75fr;
    gap: 18px;
}

.image-card {
    overflow: hidden;
    min-height: 300px;
    border: 1px solid #e1e6ef;
    border-radius: 22px;
    background: #fff;
}

.image-card img {
    width: 100%;
    height: 100%;
    min-height: 300px;
    object-fit: contain;
}

/* =========================
   GUIDE
   ========================= */

.guide {
    padding: 90px 0;
}

.guide-grid {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 72px;
    align-items: center;
}

.guide-image {
    overflow: hidden;
    border-radius: 26px;
    background: #0a1024;
}

.guide-image img {
    width: 100%;
    min-height: 430px;
    object-fit: contain;
}

.guide h2 {
    margin: 0;
    font-size: 42px;
    line-height: 1.18;
}

.guide p {
    color: #5c6678;
}

.steps {
    display: grid;
    gap: 14px;
    margin-top: 26px;
}

.step {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 16px;
    padding: 18px;
    border: 1px solid #e1e6ef;
    border-radius: 16px;
}

.step-num {
    display: grid;
    width: 52px;
    height: 52px;
    place-items: center;
    border-radius: 14px;
    color: #fff;
    background: #111b3a;
    font-weight: 900;
}

.step h3 {
    margin: 0;
    font-size: 18px;
}

.step p {
    margin: 4px 0 0;
    font-size: 14px;
}

/* =========================
   DEVICES
   ========================= */

.devices {
    padding: 82px 0;
    color: #fff;
    background: #08101f;
}

.device-grid {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 22px;
}

.device-card {
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.1);
    border-radius: 22px;
    background: #101a30;
}

.device-card img {
    width: 100%;
    height: 360px;
    object-fit: contain;
}

.device-copy {
    padding: 22px 24px 26px;
}

.device-copy h3 {
    margin: 0 0 8px;
    font-size: 24px;
}

.device-copy p {
    margin: 0;
    color: #aebbd2;
}

/* =========================
   DOWNLOAD
   ========================= */

.download {
    padding: 90px 0;
    background: #f7f8fb;
}

.download-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
    border: 1px solid #dfe4ec;
    border-radius: 28px;
    background: #fff;
}

.download-copy {
    padding: 56px;
}

.download-copy h2 {
    margin: 0;
    font-size: 42px;
    line-height: 1.2;
}

.download-copy p {
    color: #5d6779;
}

.download-points {
    margin: 24px 0 30px;
    padding: 0;
    list-style: none;
}

.download-points li {
    position: relative;
    padding: 10px 0 10px 28px;
    border-bottom: 1px solid #edf0f5;
}

.download-points li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #e8004f;
    font-weight: 900;
}

.download-image {
    min-height: 520px;
    background: #0a1024;
}

.download-image img {
    width: 100%;
    height: 100%;
    min-height: 520px;
    object-fit: contain;
}

/* =========================
   FAQ
   ========================= */

.faq {
    padding: 90px 0;
}

.faq h2 {
    margin: 0 0 34px;
    text-align: center;
    font-size: 42px;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: 12px;
}

.faq-item {
    padding: 22px 24px;
    border: 1px solid #dfe4ec;
    border-radius: 16px;
    background: #fff;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.faq-item p {
    margin: 0;
    color: #5e6879;
}

/* =========================
   FINAL CTA
   ========================= */

.final-cta {
    padding: 72px 0;
    color: #fff;
    text-align: center;
    background:
        linear-gradient(135deg,#101b3e,#28112d);
}

.final-cta h2 {
    margin: 0;
    font-size: 40px;
}

.final-cta p {
    max-width: 650px;
    margin: 14px auto 26px;
    color: #bdc8db;
}

/* =========================
   FOOTER
   ========================= */

.footer {
    padding: 26px 0;
    color: #8996ac;
    background: #050b16;
    font-size: 13px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

/* =========================
   MOBILE
   ========================= */

@media (max-width: 900px) {

    .header-inner {
        min-height: 66px;
    }

    .brand img {
        max-width: 145px !important;
        max-height: 42px !important;
    }

    .nav a:not(.header-download) {
        display: none;
    }

    .hero {
        padding: 58px 0;
    }

    .hero-grid,
    .guide-grid,
    .download-panel {
        grid-template-columns: 1fr;
    }

    .hero-grid {
        gap: 34px;
    }

    .hero-visual img {
        height: auto;
        max-height: 430px;
    }

    .image-grid {
        grid-template-columns: 1fr;
    }

    .image-card,
    .image-card img {
        min-height: 0;
    }

    .device-grid {
        grid-template-columns: 1fr;
    }

    .download-copy {
        padding: 36px 26px;
    }

    .download-image,
    .download-image img {
        min-height: 360px;
    }
}

@media (max-width: 520px) {

    .container {
        width: min(100% - 28px,1180px);
    }

    .hero h1 {
        font-size: 39px;
    }

    .hero-copy {
        font-size: 16px;
    }

    .hero-actions {
        display: grid;
    }

    .btn {
        width: 100%;
    }

    .guide,
    .devices,
    .download,
    .faq {
        padding: 62px 0;
    }

    .guide h2,
    .download-copy h2,
    .faq h2,
    .final-cta h2 {
        font-size: 31px;
    }

    .device-card img {
        height: auto;
        max-height: 380px;
    }

    .footer-inner {
        display: block;
    }
}