:root {
    --blue: #0071e3;
    --ink: #1d1d1f;
    --muted: #6e6e73;
    --subtle: #86868b;
    --page: #f5f5f7;
    --card: #ffffff;
    --soft: #f0f1f4;
    --line: rgba(0,0,0,.08);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--page);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

.intro-header {
    position: sticky;
    top: 0;
    z-index: 30;
    height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 max(42px, calc((100vw - 1180px) / 2));
    border-bottom: 1px solid rgba(0,0,0,.08);
    background: rgba(255,255,255,.82);
    backdrop-filter: saturate(180%) blur(22px);
}

.intro-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.intro-brand > span {
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: #1d1d1f;
    color: #fff;
    font-size: 14px;
    line-height: 1;
}

.intro-brand strong,
.intro-brand small {
    display: block;
}

.intro-brand strong {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .04em;
}

.intro-brand small {
    margin-top: 1px;
    color: var(--subtle);
    font-size: 10px;
}

.intro-header nav {
    display: flex;
    align-items: center;
    gap: 48px;
    color: #6b7280;
    font-size: 12px;
    font-weight: 500;
}

.intro-header nav a:hover {
    color: var(--blue);
}

.intro-nav-login {
    min-width: 82px;
    padding: 8px 18px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff !important;
    text-align: center;
}

main {
    width: min(1180px, calc(100% - 84px));
    margin: 0 auto;
}

.intro-hero {
    min-height: 650px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 420px;
    align-items: center;
    gap: 120px;
    padding: 70px 0 82px;
}

.intro-kicker {
    margin: 0 0 26px;
    color: #8b8f98;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .02em;
    text-transform: uppercase;
}

.intro-hero h1 {
    max-width: 570px;
    margin: 0;
    color: var(--ink);
    font-size: clamp(50px, 5.1vw, 74px);
    font-weight: 700;
    line-height: 1.04;
    letter-spacing: -.065em;
}

.intro-lead {
    max-width: 570px;
    margin: 54px 0 0;
    color: #666b76;
    font-size: 19px;
    font-weight: 400;
    line-height: 1.65;
    letter-spacing: -.02em;
}

.intro-actions {
    display: flex;
    align-items: center;
    gap: 22px;
    margin-top: 58px;
}

.intro-primary,
.intro-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
}

.intro-primary {
    min-width: 128px;
    padding: 0 24px;
    background: var(--blue);
    color: #fff;
}

.intro-secondary {
    color: var(--blue);
}

.intro-secondary::after {
    content: "›";
    margin-left: 5px;
    font-size: 18px;
    line-height: 1;
}

.intro-feature-line {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 42px;
}

.intro-feature-line span {
    min-width: 86px;
    padding: 8px 15px;
    border-radius: 999px;
    background: #eceef1;
    color: #8b8f98;
    text-align: center;
    font-size: 12px;
}

.intro-product-card {
    width: 380px;
    margin-left: auto;
    padding: 10px;
    border-radius: 46px;
    background: #111318;
    box-shadow: 0 34px 100px rgba(20,30,50,.18);
}

.intro-phone-shell {
    overflow: hidden;
    min-height: 650px;
    border-radius: 38px;
    background: #eef4fc;
}

.intro-phone-status {
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 22px;
    background: var(--blue);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
}

.intro-phone-status i {
    width: 24px;
    height: 10px;
    border: 1.5px solid rgba(255,255,255,.9);
    border-radius: 999px;
}

.intro-app-bar {
    height: 58px;
    display: grid;
    place-items: center;
    background: var(--blue);
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: .08em;
}

.intro-mini-card {
    padding: 18px 16px 22px;
}

.intro-mini-cover {
    position: relative;
    min-height: 210px;
    overflow: hidden;
    padding: 26px 22px;
    border-radius: 24px;
    color: #fff;
    background:
        linear-gradient(90deg, rgba(0,0,0,.56), rgba(0,0,0,.12)),
        radial-gradient(circle at 80% 28%, rgba(255,255,255,.85), transparent 24%),
        linear-gradient(135deg, #aeb8c7 0%, #e8dfd0 55%, #c9d3df 100%);
}

.intro-mini-cover::after {
    content: "•••";
    position: absolute;
    top: 18px;
    right: 20px;
    color: rgba(255,255,255,.9);
    letter-spacing: 4px;
}

.intro-mini-cover strong,
.intro-mini-cover small,
.intro-mini-cover b,
.intro-mini-cover em {
    display: block;
    position: relative;
    z-index: 1;
}

.intro-mini-cover strong {
    max-width: 245px;
    font-size: 23px;
    font-weight: 700;
    line-height: 1.18;
    letter-spacing: -.04em;
}

.intro-mini-cover small {
    width: fit-content;
    margin-top: 28px;
    padding: 7px 13px;
    border-radius: 999px;
    background: rgba(32,32,35,.44);
    color: rgba(255,255,255,.78);
    font-size: 11px;
}

.intro-mini-cover b {
    margin-top: 10px;
    font-size: 20px;
    font-weight: 650;
}

.intro-mini-cover em {
    width: fit-content;
    margin-top: 8px;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    font-style: normal;
    font-size: 12px;
}

.intro-mini-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin-top: -20px;
    position: relative;
    z-index: 2;
    padding: 18px 12px;
    border-radius: 24px;
    background: rgba(255,255,255,.96);
    box-shadow: 0 10px 24px rgba(35,64,108,.08);
}

.intro-mini-meta span {
    display: grid;
    gap: 7px;
    place-items: center;
    min-height: 46px;
    border-right: 1px solid #e5edf7;
}

.intro-mini-meta span:last-child {
    border-right: none;
}

.intro-mini-meta b {
    color: #111827;
    font-size: 14px;
    font-weight: 520;
    letter-spacing: -.02em;
}

.intro-mini-meta small {
    order: -1;
    color: #7d8ca3;
    font-size: 10px;
}

.intro-mini-menu {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 16px;
    padding: 14px 8px;
    border-radius: 20px;
    background: rgba(255,255,255,.96);
    box-shadow: 0 10px 24px rgba(35,64,108,.06);
}

.intro-mini-menu span {
    position: relative;
    padding-top: 28px;
    color: #2b3445;
    text-align: center;
    font-size: 12px;
    font-weight: 600;
}

.intro-mini-menu span::before {
    content: "";
    position: absolute;
    top: 4px;
    left: 50%;
    width: 20px;
    height: 18px;
    transform: translateX(-50%);
    border: 2px solid #2f7df6;
    border-radius: 5px;
}

.intro-mini-search {
    margin-top: 16px;
    padding: 12px 18px;
    border-radius: 999px;
    background: rgba(255,255,255,.72);
    color: #9aa7b8;
    font-size: 12px;
}

.intro-mini-search::before {
    content: "⌕";
    margin-right: 6px;
    color: #a9b5c5;
}

.intro-mini-feed {
    margin-top: 14px;
    padding: 18px 20px;
    border-radius: 22px;
    background: rgba(255,255,255,.96);
    box-shadow: 0 10px 24px rgba(35,64,108,.06);
}

.intro-mini-feed p {
    display: grid;
    grid-template-columns: 8px 1fr;
    column-gap: 12px;
    row-gap: 5px;
    margin: 16px 0 0;
    color: #111827;
    font-size: 14px;
}

.intro-mini-feed p:first-child {
    margin-top: 0;
}

.intro-mini-feed i {
    width: 7px;
    height: 7px;
    margin-top: 6px;
    border-radius: 50%;
    background: var(--blue);
}

.intro-mini-feed strong {
    font-weight: 600;
}

.intro-mini-feed small {
    grid-column: 2;
    color: #8b9ab0;
    font-size: 11px;
}

.intro-statement {
    margin: 0 auto 112px;
    padding: 98px 34px;
    border-radius: 32px;
    background: #f0f1f4;
    text-align: center;
}

.intro-statement .intro-kicker {
    margin-bottom: 28px;
}

.intro-statement h2 {
    max-width: 660px;
    margin: 0 auto;
    color: var(--ink);
    font-size: clamp(34px, 4.4vw, 56px);
    font-weight: 700;
    line-height: 1.12;
    letter-spacing: -.055em;
}

.intro-statement p:last-child {
    max-width: 640px;
    margin: 34px auto 0;
    color: #6b7280;
    font-size: 16px;
    line-height: 1.7;
}

.intro-section {
    padding: 0 0 108px;
}

.intro-section-title {
    max-width: 720px;
    margin: 0 0 74px;
    text-align: left;
}

.intro-section-title h2,
.intro-cta h2 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(38px, 4.5vw, 58px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -.055em;
}

.intro-section-title > p:last-child {
    max-width: 610px;
    margin: 22px 0 0;
    color: #6b7280;
    font-size: 17px;
    line-height: 1.65;
}

.intro-feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.intro-feature-grid article,
.intro-scene-list div,
.intro-steps li {
    border-radius: 24px;
    background: #f0f1f4;
}

.intro-feature-grid article {
    min-height: 205px;
    padding: 34px 28px;
}

.intro-feature-grid article > span {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: #fff;
    color: var(--blue);
    font-size: 11px;
    font-weight: 500;
}

.intro-feature-grid h3 {
    margin: 45px 0 12px;
    color: var(--ink);
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -.03em;
}

.intro-feature-grid p {
    margin: 0;
    color: #6b7280;
    font-size: 14px;
    line-height: 1.7;
}

.intro-scenes {
    padding-top: 10px;
}

.intro-scene-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.intro-scene-list div {
    min-height: 168px;
    padding: 28px;
}

.intro-scene-list strong,
.intro-scene-list span {
    display: block;
}

.intro-scene-list strong {
    color: var(--ink);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -.03em;
}

.intro-scene-list span {
    margin-top: 18px;
    color: #6b7280;
    font-size: 14px;
    line-height: 1.65;
}

.intro-guide-section {
    padding-bottom: 108px;
}

.intro-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.intro-steps li {
    min-height: 200px;
    padding: 28px;
}

.intro-steps li > span {
    color: var(--blue);
    font-size: 12px;
    font-weight: 600;
}

.intro-steps h3 {
    margin: 48px 0 10px;
    color: var(--ink);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -.03em;
}

.intro-steps p {
    margin: 0;
    color: #6b7280;
    font-size: 14px;
    line-height: 1.65;
}

.intro-cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
    margin-bottom: 70px;
    padding: 58px 42px;
    border-radius: 32px;
    background: #17191d;
    color: #fff;
}

.intro-cta .intro-kicker {
    color: rgba(255,255,255,.58);
}

.intro-cta h2 {
    color: #fff;
    font-size: clamp(32px, 4vw, 48px);
}

.intro-cta p:not(.intro-kicker) {
    max-width: 600px;
    margin: 18px 0 0;
    color: rgba(255,255,255,.68);
    font-size: 16px;
    line-height: 1.6;
}

.intro-cta .intro-actions {
    flex: 0 0 auto;
    margin: 0;
}

.intro-cta .intro-primary {
    background: #fff;
    color: var(--ink);
}

.intro-cta .intro-secondary {
    color: #fff;
}

.intro-footer {
    width: min(1180px, calc(100% - 84px));
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 auto;
    padding: 25px 0 35px;
    border-top: 1px solid var(--line);
    color: #86868b;
    font-size: 12px;
}

.intro-footer strong {
    margin-right: 12px;
    color: var(--ink);
    font-weight: 600;
}

@media (max-width: 980px) {
    .intro-hero {
        grid-template-columns: 1fr;
        gap: 58px;
    }

    .intro-product-card {
        margin: 0 auto;
    }

    .intro-feature-grid,
    .intro-scene-list,
    .intro-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .intro-cta {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .intro-header {
        padding: 0 16px;
    }

    .intro-header nav > a:not(.intro-nav-login) {
        display: none;
    }

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

    .intro-hero {
        min-height: 0;
        padding: 48px 0 70px;
    }

    .intro-hero h1 {
        font-size: 46px;
    }

    .intro-lead {
        margin-top: 30px;
        font-size: 17px;
    }

    .intro-actions {
        margin-top: 34px;
    }

    .intro-product-card {
        width: 100%;
        max-width: 360px;
    }

    .intro-statement {
        margin-bottom: 74px;
        padding: 68px 24px;
        border-radius: 28px;
    }

    .intro-section {
        padding-bottom: 78px;
    }

    .intro-section-title {
        margin-bottom: 32px;
    }

    .intro-section-title h2,
    .intro-statement h2 {
        font-size: 34px;
    }

    .intro-section-title > p:last-child,
    .intro-statement p:last-child {
        font-size: 15px;
    }

    .intro-feature-grid,
    .intro-scene-list,
    .intro-steps {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .intro-feature-grid article,
    .intro-scene-list div,
    .intro-steps li {
        min-height: auto;
        padding: 25px;
    }

    .intro-cta {
        padding: 34px 26px;
        border-radius: 28px;
    }

    .intro-footer {
        align-items: flex-start;
        gap: 16px;
        flex-direction: column;
    }

    .intro-footer div span {
        display: block;
        margin-top: 4px;
    }
}