:root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --text: #202536;
    --muted: #5f667a;
    --line: #e3e7f0;
    --primary: #3958f4;
    --primary-dark: #2235b7;
    --soft: #edf0ff;
    --success: #0f8f74;
    --warning: #aa6a00;
    --shadow: 0 18px 48px rgba(24, 33, 72, 0.10);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.68;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 22px 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand-logo,
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
}

.brand-logo span {
    font-size: 22px;
}

.main-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.main-nav a {
    padding: 8px 11px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 14px;
}

.main-nav a:hover,
.main-nav a:focus {
    color: var(--primary);
    background: var(--soft);
}

.search-strip {
    border-top: 1px solid var(--line);
    background: #fff;
}

.search-form {
    max-width: 1180px;
    margin: 0 auto;
    padding: 10px 22px 14px;
    display: grid;
    grid-template-columns: auto minmax(180px, 1fr) auto;
    gap: 10px;
    align-items: center;
}

.search-form label {
    font-weight: 700;
    color: var(--primary-dark);
}

.search-form input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 11px 16px;
    font-size: 15px;
    background: #fbfcff;
}

.search-form button,
.btn-primary,
.btn-ghost {
    border: 0;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 700;
    padding: 12px 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.search-form button,
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 14px 26px rgba(57, 88, 244, 0.22);
}

.btn-ghost {
    background: #fff;
    color: var(--primary-dark);
    border: 1px solid var(--line);
}

.search-message {
    grid-column: 1 / -1;
    margin: 0;
    font-size: 13px;
    color: var(--muted);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 22px;
}

.hero {
    padding: 58px 0 36px;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(300px, .92fr);
    gap: 28px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: var(--soft);
    border-radius: 999px;
    padding: 7px 12px;
    font-weight: 700;
    font-size: 14px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.22;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(34px, 6vw, 64px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(25px, 3.2vw, 38px);
    letter-spacing: -0.025em;
}

h3 {
    font-size: 21px;
}

p {
    margin: 0 0 14px;
}

.lead {
    color: var(--muted);
    font-size: 18px;
    max-width: 720px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.hero-note,
.domain-note,
.card-note {
    color: var(--muted);
    font-size: 14px;
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 26px;
}

.stat-card,
.info-card,
.video-card,
.step-card,
.review-card,
.faq-item,
.timeline-item,
.contact-card,
.notice-card,
.json-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.stat-card {
    padding: 18px;
}

.stat-card strong {
    display: block;
    font-size: 26px;
    color: var(--primary-dark);
}

.hero-media {
    position: relative;
}

.hero-media figure {
    margin: 0;
}

.hero-media img,
.image-frame img {
    border-radius: 28px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    background: #fff;
}

figcaption {
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
}

section {
    padding: 54px 0;
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 22px;
}

.section-head p {
    color: var(--muted);
    max-width: 640px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.info-card,
.step-card,
.review-card,
.faq-item,
.contact-card,
.notice-card,
.json-card {
    padding: 22px;
}

.info-card .icon,
.step-card .number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--soft);
    color: var(--primary-dark);
    font-weight: 800;
    margin-bottom: 13px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
}

.tags span {
    background: #f1f4f9;
    color: var(--muted);
    padding: 5px 9px;
    border-radius: 999px;
    font-size: 12px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.video-card {
    overflow: hidden;
}

.video-shell {
    position: relative;
    aspect-ratio: 16 / 10;
    background: #151a35;
    overflow: hidden;
}

.video-shell video,
.video-shell img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-shell video {
    display: block;
}

.play-indicator {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(20, 26, 52, 0.18);
    opacity: 0;
    transition: opacity .2s ease;
}

.video-card:hover .play-indicator,
.video-card:focus-within .play-indicator {
    opacity: 1;
}

.play-button {
    width: 64px;
    height: 64px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    background: rgba(255, 255, 255, 0.94);
    color: var(--primary-dark);
    font-weight: 900;
    box-shadow: 0 14px 30px rgba(0,0,0,.22);
}

.video-content {
    padding: 18px;
}

.video-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--muted);
    font-size: 13px;
}

.timeline {
    display: grid;
    gap: 14px;
}

.timeline-item {
    display: grid;
    grid-template-columns: 128px 1fr;
    gap: 18px;
    padding: 20px;
}

.timeline-item time {
    color: var(--primary-dark);
    font-weight: 800;
}

.faq-list {
    display: grid;
    gap: 14px;
}

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

.review-card blockquote {
    margin: 0 0 16px;
    color: var(--text);
}

.review-card cite {
    color: var(--muted);
    font-style: normal;
    font-size: 14px;
}

.breadcrumb {
    margin: 26px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.breadcrumb a {
    color: var(--primary-dark);
    font-weight: 700;
}

.inner-hero {
    padding: 38px 0 28px;
}

.content-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 22px;
    align-items: start;
}

.sidebar {
    position: sticky;
    top: 132px;
}

.sidebar .info-card {
    box-shadow: none;
}

.check-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}

.check-list li {
    padding-left: 28px;
    position: relative;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--success);
    font-weight: 900;
}

pre {
    white-space: pre-wrap;
    overflow: auto;
    background: #11172f;
    color: #f7f8ff;
    padding: 18px;
    border-radius: 18px;
    font-size: 13px;
}

.site-footer {
    margin-top: 50px;
    background: #141a32;
    color: #dce2ff;
    padding: 46px 22px 24px;
}

.footer-grid {
    max-width: 1180px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.4fr .8fr .8fr;
    gap: 24px;
}

.footer-grid p,
.footer-grid a {
    color: #c6cdeb;
}

.footer-grid a {
    display: block;
    margin: 8px 0;
}

.footer-grid h2 {
    font-size: 18px;
    color: #fff;
}

.copyright {
    max-width: 1180px;
    margin: 28px auto 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #b8c0e6;
    font-size: 14px;
}

@media (max-width: 900px) {
    .header-inner,
    .hero-grid,
    .content-layout,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .header-inner {
        display: grid;
    }

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

    .search-form,
    .grid-3,
    .grid-2,
    .video-grid,
    .stat-row {
        grid-template-columns: 1fr;
    }

    .timeline-item {
        grid-template-columns: 1fr;
    }

    .section-head {
        display: block;
    }

    .sidebar {
        position: static;
    }
}

@media (max-width: 560px) {
    .hero {
        padding-top: 32px;
    }

    .container,
    .header-inner,
    .search-form {
        padding-left: 16px;
        padding-right: 16px;
    }

    h1 {
        font-size: 34px;
    }
}