:root {
    --primary: #0056cc;
    --primary-light: #007aff;
    --accent: #00c6ff;
    --text-main: #1a1a1b;
    --text-sub: #636366;
    --bg-soft: #f6f8fb;
    --white: #ffffff;
    --border: #e5e8ee;
    --shadow: 0 20px 60px rgba(0, 56, 128, 0.12);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--white);
    color: var(--text-main);
    font-family: "Inter", "PingFang SC", "HarmonyOS Sans", sans-serif;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

body.dada {
    --primary: #6b48d7;
    --primary-light: #8668e8;
    --accent: #ffb340;
    --bg-soft: #f8f6fd;
    --shadow: 0 20px 60px rgba(80, 54, 160, 0.12);
}

a {
    color: inherit;
}

.container {
    width: min(1120px, calc(100% - 60px));
    margin: 0 auto;
}

.site-header {
    position: fixed;
    z-index: 1000;
    top: 0;
    width: 100%;
    height: 70px;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(180%) blur(18px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    color: var(--primary);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    text-decoration: none;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 34px;
    font-size: 14px;
}

.site-nav > a {
    text-decoration: none;
    transition: color 0.25s ease;
}

.site-nav > a:hover,
.product-menu:hover .product-trigger,
.product-menu:focus-within .product-trigger {
    color: var(--primary-light);
}

.product-menu {
    position: relative;
}

.product-trigger {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 23px 0;
    border: 0;
    background: transparent;
    color: var(--text-main);
    cursor: pointer;
    font: inherit;
}

.product-trigger::after {
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    content: "";
    transform: rotate(45deg) translateY(-2px);
}

.product-dropdown {
    position: absolute;
    top: calc(100% - 7px);
    left: -20px;
    width: 280px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--white);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.25s ease;
}

.product-menu:hover .product-dropdown,
.product-menu:focus-within .product-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.product-dropdown a {
    display: block;
    padding: 12px 14px;
    border-radius: 8px;
    text-decoration: none;
}

.product-dropdown a:hover,
.product-dropdown a:focus,
.product-dropdown a[aria-current="page"] {
    background: var(--bg-soft);
    outline: none;
}

.product-dropdown strong,
.product-dropdown span {
    display: block;
}

.product-dropdown strong {
    color: var(--primary);
    font-size: 14px;
}

.product-dropdown span {
    margin-top: 2px;
    color: var(--text-sub);
    font-size: 12px;
    line-height: 1.5;
}

.product-hero {
    position: relative;
    display: flex;
    min-height: 690px;
    align-items: center;
    padding: 140px 0 90px;
    overflow: hidden;
    background: linear-gradient(145deg, #f7fbff 0%, #eef5ff 55%, #ffffff 100%);
}

.dada .product-hero {
    background: linear-gradient(145deg, #fbf9ff 0%, #f1edff 55%, #ffffff 100%);
}

.product-hero::before {
    position: absolute;
    top: -180px;
    right: -120px;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--accent) 16%, transparent), transparent 68%);
    content: "";
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 80px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.eyebrow::before {
    width: 24px;
    height: 2px;
    background: var(--accent);
    content: "";
}

h1 {
    max-width: 700px;
    margin-bottom: 24px;
    font-size: clamp(2.7rem, 5vw, 4.5rem);
    font-weight: 650;
    letter-spacing: -2px;
    line-height: 1.12;
}

.hero-lead {
    max-width: 650px;
    color: var(--text-sub);
    font-size: 1.12rem;
}

.hero-actions {
    display: flex;
    gap: 14px;
    margin-top: 36px;
}

.button {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: 1px solid var(--primary);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
}

.button-primary {
    background: var(--primary);
    color: var(--white);
}

.button-primary:hover {
    background: var(--primary-light);
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.button-secondary {
    color: var(--primary);
}

.button-secondary:hover {
    background: var(--white);
    transform: translateY(-2px);
}

.app-showcase {
    display: flex;
    justify-content: center;
}

.app-card {
    position: relative;
    width: min(360px, 100%);
    padding: 54px 40px;
    border: 1px solid rgba(255, 255, 255, 0.75);
    border-radius: 32px;
    background: rgba(255, 255, 255, 0.72);
    box-shadow: var(--shadow);
    text-align: center;
    backdrop-filter: blur(18px);
}

.app-icon {
    display: grid;
    width: 110px;
    height: 110px;
    margin: 0 auto 24px;
    place-items: center;
    border-radius: 25px;
    background: linear-gradient(145deg, var(--primary-light), var(--primary));
    box-shadow: 0 16px 30px color-mix(in srgb, var(--primary) 28%, transparent);
    color: var(--white);
    font-size: 48px;
    font-weight: 700;
}

.app-icon-image {
    display: block;
    object-fit: cover;
    background: transparent;
}

.app-card h2 {
    color: var(--primary);
    font-size: 1.45rem;
}

.app-card p {
    margin-top: 8px;
    color: var(--text-sub);
    font-size: 14px;
}

.section {
    padding: 110px 0;
}

.section-soft {
    background: var(--bg-soft);
}

.section-heading {
    max-width: 680px;
    margin-bottom: 48px;
}

.section-label {
    display: block;
    margin-bottom: 10px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
}

.section-heading h2 {
    margin-bottom: 14px;
    color: var(--primary);
    font-size: clamp(2rem, 4vw, 2.7rem);
    line-height: 1.25;
}

.section-heading p {
    color: var(--text-sub);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--white);
}

.feature-number {
    display: block;
    margin-bottom: 28px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: var(--primary);
    font-size: 1.08rem;
}

.feature-card p {
    color: var(--text-sub);
    font-size: 14px;
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.screenshot-item {
    text-align: center;
}

.screenshot-placeholder {
    position: relative;
    display: flex;
    aspect-ratio: 9 / 18.5;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px dashed color-mix(in srgb, var(--primary) 38%, var(--border));
    border-radius: 28px;
    background: linear-gradient(155deg, var(--white), var(--bg-soft));
    color: var(--text-sub);
    font-size: 13px;
}

.screenshot-placeholder::before {
    position: absolute;
    top: 12px;
    width: 35%;
    height: 5px;
    border-radius: 10px;
    background: var(--border);
    content: "";
}

.screenshot-placeholder span {
    padding: 20px;
}

.screenshot-image {
    display: block;
    width: 100%;
    aspect-ratio: 9 / 19.5;
    object-fit: contain;
    object-position: top center;
    border: 1px solid var(--border);
    border-radius: 28px;
    background: var(--bg-soft);
    box-shadow: 0 14px 36px rgba(40, 25, 70, 0.12);
}

.screenshot-item p {
    margin-top: 16px;
    color: var(--text-sub);
    font-size: 14px;
}

.info-grid {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: 70px;
    align-items: start;
}

.info-grid h2 {
    color: var(--primary);
    font-size: clamp(2rem, 4vw, 2.7rem);
    line-height: 1.3;
}

.info-panel {
    padding: 36px;
    border-left: 4px solid var(--accent);
    background: var(--bg-soft);
}

.info-panel p + p {
    margin-top: 14px;
}

.info-panel a {
    color: var(--primary);
    font-weight: 600;
}

.process-list {
    display: grid;
    margin-top: 28px;
    gap: 14px;
    list-style: none;
}

.process-list li {
    display: grid;
    grid-template-columns: 34px 1fr;
    gap: 12px;
    align-items: start;
}

.process-list b {
    display: grid;
    width: 30px;
    height: 30px;
    place-items: center;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    font-size: 12px;
}

.notice {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--text-sub);
    font-size: 13px;
}

footer {
    padding: 54px 0;
    background: #121212;
    color: #888;
    font-size: 13px;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.footer-brand {
    margin-bottom: 8px;
    color: #bbb;
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 18px;
}

.footer-links a:hover {
    color: #ddd;
}

@media (max-width: 900px) {
    .hero-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .hero-grid {
        gap: 55px;
    }

    .app-showcase {
        justify-content: flex-start;
    }

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

@media (max-width: 680px) {
    .container {
        width: min(100% - 40px, 1120px);
    }

    .logo {
        font-size: 15px;
    }

    .site-nav {
        gap: 18px;
    }

    .site-nav > a:not(.home-link) {
        display: none;
    }

    .product-dropdown {
        position: fixed;
        top: 62px;
        right: 16px;
        left: auto;
        width: min(280px, calc(100vw - 32px));
    }

    .product-hero {
        min-height: auto;
        padding: 130px 0 80px;
    }

    h1 {
        font-size: 2.65rem;
    }

    .hero-actions {
        align-items: stretch;
        flex-direction: column;
    }

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

    .screenshot-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px 16px;
    }

    .section {
        padding: 80px 0;
    }

    .footer-content {
        align-items: flex-start;
        flex-direction: column;
    }

    .footer-links {
        flex-wrap: wrap;
    }
}