* {
    box-sizing: border-box;
}

:root {
    --bg: #f7f4ef;
    --panel: rgba(255, 255, 255, .76);
    --text: #111827;
    --muted: #667085;
    --line: rgba(17, 24, 39, .1);
    --soft: #eef2f6;
    --accent: #111827;
    --radius: 28px;
    --shadow: 0 24px 70px rgba(17, 24, 39, .08);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 10%, rgba(255,255,255,.9), transparent 28rem),
        radial-gradient(circle at 85% 5%, rgba(226,232,240,.8), transparent 32rem),
        var(--bg);
    line-height: 1.7;
}

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

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

button,
input,
textarea {
    font: inherit;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(22px);
    background: rgba(247, 244, 239, .82);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.brand-link,
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    letter-spacing: .02em;
}

.brand-link img,
.footer-logo img {
    border-radius: 14px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.main-nav a {
    color: var(--muted);
    padding: 10px 13px;
    border-radius: 999px;
    font-size: 14px;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
    color: var(--text);
    background: rgba(255, 255, 255, .8);
}

.search-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto 14px;
}

.search-form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,.78);
    box-shadow: 0 12px 40px rgba(17, 24, 39, .04);
}

.search-form input {
    border: 0;
    outline: 0;
    padding: 12px 18px;
    background: transparent;
    color: var(--text);
    min-width: 0;
}

.search-form button,
.btn {
    border: 0;
    border-radius: 999px;
    padding: 12px 20px;
    cursor: pointer;
    transition: transform .2s ease, opacity .2s ease, background .2s ease;
}

.search-form button,
.btn.primary {
    background: var(--accent);
    color: white;
}

.btn.ghost {
    border: 1px solid var(--line);
    background: rgba(255,255,255,.7);
    color: var(--text);
}

.search-form button:hover,
.btn:hover,
.share-list button:hover {
    transform: translateY(-2px);
}

.search-note {
    margin: 8px 12px 0;
    color: var(--muted);
    font-size: 13px;
}

main {
    overflow: hidden;
}

.hero {
    width: min(1180px, calc(100% - 32px));
    margin: 54px auto 0;
    min-height: 72vh;
    display: grid;
    grid-template-columns: minmax(0, 1.03fr) minmax(320px, .97fr);
    gap: 46px;
    align-items: center;
}

.inner-hero {
    min-height: 54vh;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    color: var(--muted);
    font-size: 13px;
    letter-spacing: .16em;
    text-transform: uppercase;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.18;
    letter-spacing: -.03em;
}

h1 {
    font-size: clamp(42px, 7vw, 86px);
    max-width: 880px;
}

h2 {
    font-size: clamp(30px, 4.5vw, 58px);
}

h3 {
    font-size: 22px;
}

.hero-copy p,
.section-heading p,
.split-section p,
.contact-card p,
.video-content p {
    color: var(--muted);
}

.hero-copy p {
    font-size: clamp(18px, 2vw, 22px);
    max-width: 680px;
    margin: 26px 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-media,
.brand-visual {
    position: relative;
    margin: 0;
    border-radius: 42px;
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--panel);
    border: 1px solid rgba(255,255,255,.76);
}

.hero-media img,
.brand-visual img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.image-description {
    padding: 12px 16px;
    font-size: 12px;
    color: var(--muted);
    background: rgba(255,255,255,.72);
}

.section {
    width: min(1180px, calc(100% - 32px));
    margin: 112px auto;
}

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

.split-section {
    display: grid;
    grid-template-columns: .86fr 1.14fr;
    gap: 48px;
    align-items: start;
}

.intro-panel,
.contact-panel {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 36px;
    align-items: center;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255,255,255,.56);
    box-shadow: var(--shadow);
}

.feature-grid,
.video-grid,
.testimonial-grid,
.data-grid {
    display: grid;
    gap: 18px;
}

.feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.video-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.testimonial-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.data-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.video-card,
.testimonial-card,
.data-card,
.contact-card,
.faq-list details {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255,255,255,.66);
    box-shadow: 0 16px 44px rgba(17,24,39,.05);
}

.feature-card,
.testimonial-card,
.data-card,
.contact-card {
    padding: 26px;
}

.feature-card p,
.testimonial-card p,
.data-card p {
    color: var(--muted);
    margin-bottom: 0;
}

.feature-icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: #111827;
    color: #fff;
    margin-bottom: 18px;
}

.video-card {
    overflow: hidden;
}

.video-card figure {
    margin: 0;
}

.poster-wrap {
    position: relative;
    overflow: hidden;
}

.poster-wrap img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    transition: transform .55s ease, filter .55s ease;
}

.play-button {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 74px;
    height: 74px;
    transform: translate(-50%, -50%) scale(.88);
    display: grid;
    place-items: center;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,.9);
    background: rgba(17, 24, 39, .76);
    color: white;
    opacity: 0;
    pointer-events: none;
    transition: opacity .24s ease, transform .24s ease;
}

.video-card:hover .play-button,
.video-card:focus-within .play-button,
.video-card.is-playing .play-button {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.video-card:hover .poster-wrap img {
    transform: scale(1.04);
    filter: saturate(1.08);
}

.video-content {
    padding: 22px;
}

.metrics,
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.metrics span,
.tags span {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 6px 10px;
    color: var(--muted);
    font-size: 12px;
    background: rgba(255,255,255,.62);
}

.data-card strong {
    display: block;
    font-size: clamp(30px, 5vw, 54px);
    letter-spacing: -.05em;
}

.faq-list {
    display: grid;
    gap: 12px;
}

.faq-list details {
    padding: 22px 24px;
}

.faq-list summary {
    cursor: pointer;
    font-weight: 700;
}

.faq-list p {
    color: var(--muted);
    margin-bottom: 0;
}

.contact-form {
    display: grid;
    gap: 12px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,.72);
    padding: 14px 16px;
    outline: 0;
}

.contact-form textarea {
    min-height: 120px;
    resize: vertical;
}

.contact-form button {
    justify-self: start;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: rgba(255,255,255,.42);
    padding: 58px 0 26px;
}

.footer-grid,
.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.1fr .7fr .8fr;
    gap: 34px;
}

.footer-grid h2 {
    font-size: 18px;
    letter-spacing: 0;
}

.footer-grid p,
.footer-links a,
.footer-bottom {
    color: var(--muted);
}

.footer-links {
    padding: 0;
    margin: 0;
    list-style: none;
    display: grid;
    gap: 8px;
}

.share-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.share-list button {
    border: 1px solid var(--line);
    background: rgba(255,255,255,.7);
    border-radius: 999px;
    padding: 8px 12px;
    cursor: pointer;
}

.footer-bottom {
    margin-top: 34px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
    font-size: 13px;
}

.subtle-section {
    padding: 46px;
    border-radius: 36px;
    background: linear-gradient(135deg, rgba(255,255,255,.68), rgba(238,242,246,.62));
    border: 1px solid rgba(255,255,255,.7);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 960px) {
    .header-inner,
    .hero,
    .intro-panel,
    .contact-panel,
    .split-section,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .header-inner {
        align-items: flex-start;
        padding: 18px 0 10px;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .hero {
        min-height: auto;
        margin-top: 36px;
    }

    .feature-grid,
    .video-grid,
    .testimonial-grid,
    .data-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .search-form {
        grid-template-columns: 1fr;
        border-radius: 24px;
    }

    .feature-grid,
    .video-grid,
    .testimonial-grid,
    .data-grid {
        grid-template-columns: 1fr;
    }

    .section {
        margin: 72px auto;
    }

    .intro-panel,
    .contact-panel,
    .subtle-section {
        padding: 20px;
        border-radius: 24px;
    }

    h1 {
        font-size: 40px;
    }
}