:root {
    --bg: #040404;
    --panel: rgba(255, 255, 255, 0.06);
    --panel-strong: rgba(255, 255, 255, 0.1);
    --line: rgba(255, 255, 255, 0.14);
    --text: #f5f3ef;
    --muted: rgba(245, 243, 239, 0.74);
    --accent: #ffffff;
    --accent-soft: rgba(255, 255, 255, 0.12);
    --glow: rgba(255, 255, 255, 0.18);
    --shadow: 0 32px 80px rgba(0, 0, 0, 0.45);
    --hero-font: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
    --body-font: "Avenir Next", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    font-family: var(--body-font);
    background:
        radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.14) 0, rgba(255, 255, 255, 0) 2px),
        radial-gradient(circle at 34% 14%, rgba(255, 255, 255, 0.18) 0, rgba(255, 255, 255, 0) 1.4px),
        radial-gradient(circle at 73% 18%, rgba(255, 255, 255, 0.16) 0, rgba(255, 255, 255, 0) 2px),
        radial-gradient(circle at 82% 42%, rgba(255, 255, 255, 0.12) 0, rgba(255, 255, 255, 0) 1.6px),
        radial-gradient(circle at 14% 68%, rgba(255, 255, 255, 0.16) 0, rgba(255, 255, 255, 0) 2px),
        radial-gradient(circle at 60% 74%, rgba(255, 255, 255, 0.12) 0, rgba(255, 255, 255, 0) 1.8px),
        linear-gradient(180deg, #101010 0%, #050505 50%, #0d0d0d 100%);
    background-size: 280px 280px, 240px 240px, 300px 300px, 220px 220px, 260px 260px, 240px 240px, auto;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at top, rgba(255, 255, 255, 0.08), transparent 38%),
        radial-gradient(circle at bottom right, rgba(255, 255, 255, 0.06), transparent 30%);
    mix-blend-mode: screen;
    opacity: 0.55;
}

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

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

.site-shell {
    width: min(1180px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 28px 0 72px;
}

.page-shell {
    width: min(920px, calc(100vw - 32px));
}

.site-header,
.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.site-header {
    position: sticky;
    top: 18px;
    z-index: 10;
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(8, 8, 8, 0.72);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
}

.site-nav {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 18px;
    color: var(--muted);
    font-size: 0.96rem;
}

.site-nav a:hover,
.footer-links a:hover {
    color: var(--accent);
}

.hero {
    display: grid;
    grid-template-columns: 1.12fr 0.88fr;
    gap: 36px;
    align-items: center;
    padding: 82px 0 54px;
}

.hero-copy,
.hero-card,
.feature-card,
.spotlight,
.doc-page,
.site-footer {
    border: 1px solid var(--line);
    background: var(--panel);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
}

.hero-copy {
    padding: 48px;
    border-radius: 36px;
}

.hero-card {
    position: relative;
    min-height: 560px;
    border-radius: 42px;
    overflow: hidden;
    background:
        radial-gradient(circle at 50% 20%, rgba(255, 255, 255, 0.18), transparent 30%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
}

.hero-card::after {
    content: "";
    position: absolute;
    inset: 14px;
    border-radius: 32px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    pointer-events: none;
}

.eyebrow {
    margin: 0 0 14px;
    color: rgba(245, 243, 239, 0.58);
    letter-spacing: 0.22em;
    font-size: 0.78rem;
}

h1,
h2 {
    margin: 0;
    font-family: var(--hero-font);
    font-weight: 700;
    letter-spacing: -0.04em;
}

h1 {
    font-size: clamp(3rem, 7vw, 5.8rem);
    line-height: 0.94;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 1;
}

h3 {
    margin: 0 0 14px;
    font-size: 1.18rem;
}

.hero-text,
.launch-copy p,
.feature-card p,
.doc-page p,
.faq-list p,
.site-footer p {
    color: var(--muted);
    line-height: 1.8;
}

.hero-text {
    max-width: 42rem;
    margin: 22px 0 28px;
    font-size: 1.06rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 28px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 700;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    color: #070707;
    background: #ffffff;
}

.button-secondary {
    border-color: var(--line);
    background: rgba(255, 255, 255, 0.04);
}

.hero-points {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 0;
    list-style: none;
    color: var(--muted);
}

.hero-points li {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.hero-points li::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: #ffffff;
    box-shadow: 0 0 18px rgba(255, 255, 255, 0.8);
}

.hero-icon {
    position: absolute;
    inset: 84px 72px auto;
    width: calc(100% - 144px);
    max-width: 420px;
    margin: 0 auto;
    filter: drop-shadow(0 24px 42px rgba(0, 0, 0, 0.45));
}

.floating-note {
    position: absolute;
    min-width: 168px;
    padding: 16px 18px;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(16px);
    line-height: 1.4;
}

.floating-note span {
    display: block;
    margin-bottom: 6px;
    color: rgba(245, 243, 239, 0.6);
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.floating-note strong {
    font-size: 1rem;
}

.floating-note-left {
    left: 30px;
    bottom: 72px;
}

.floating-note-right {
    right: 30px;
    top: 76px;
}

.section {
    margin-top: 26px;
}

.section-heading {
    padding: 0 6px 26px;
}

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

.feature-card,
.spotlight,
.doc-page,
.site-footer {
    border-radius: 30px;
}

.feature-card {
    padding: 30px;
}

.spotlight {
    padding: 34px;
}

.launch-layout {
    display: grid;
    grid-template-columns: 1fr 0.92fr;
    gap: 24px;
    align-items: start;
}

.launch-checklist {
    display: grid;
    gap: 14px;
}

.check-item {
    padding: 18px 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    font-weight: 600;
}

.faq-section {
    padding-bottom: 20px;
}

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

.faq-list details {
    padding: 20px 22px;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.04);
}

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

.faq-list p {
    margin: 14px 0 0;
}

.site-footer {
    margin-top: 28px;
    padding: 26px 30px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    color: var(--muted);
}

.doc-page {
    margin-top: 32px;
    padding: 40px;
}

.doc-meta {
    margin-top: 12px;
}

.doc-section {
    margin-top: 30px;
}

.doc-section h2 {
    margin-bottom: 12px;
    font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.doc-list {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
    line-height: 1.9;
}

.not-found-page {
    text-align: center;
}

.not-found-page .hero-actions {
    justify-content: center;
    margin-top: 24px;
}

@media (max-width: 920px) {
    .site-header,
    .site-footer,
    .hero,
    .launch-layout {
        grid-template-columns: 1fr;
        flex-direction: column;
        align-items: flex-start;
    }

    .site-header,
    .site-footer {
        border-radius: 28px;
    }

    .hero-card {
        min-height: 480px;
    }

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

@media (max-width: 640px) {
    .site-shell {
        width: min(100vw - 18px, 100%);
        padding-top: 12px;
        padding-bottom: 40px;
    }

    .site-header {
        padding: 16px;
        border-radius: 26px;
    }

    .hero {
        padding: 28px 0 20px;
        gap: 18px;
    }

    .hero-copy,
    .feature-card,
    .spotlight,
    .doc-page,
    .site-footer {
        padding: 24px;
    }

    .hero-card {
        min-height: 400px;
        border-radius: 28px;
    }

    .hero-icon {
        inset: 58px 32px auto;
        width: calc(100% - 64px);
    }

    .floating-note {
        min-width: 132px;
        padding: 12px 14px;
        border-radius: 18px;
    }

    .floating-note-left {
        left: 16px;
        bottom: 16px;
    }

    .floating-note-right {
        right: 16px;
        top: 16px;
    }

    .site-nav,
    .footer-links {
        gap: 12px;
    }
}