:root {
    color-scheme: light dark;
    --bg: #07111f;
    --bg-soft: #0d1b2d;
    --panel: rgba(255, 255, 255, 0.075);
    --panel-strong: rgba(255, 255, 255, 0.11);
    --border: rgba(255, 255, 255, 0.12);
    --text: #f6f8fc;
    --muted: #a8b4c8;
    --accent: #ffc928;
    --accent-strong: #f2ad00;
    --blue: #45bceb;
    --success: #44d49b;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
    --radius: 24px;
    --content: 920px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    background:
        radial-gradient(circle at 8% 5%, rgba(69, 188, 235, 0.17), transparent 30rem),
        radial-gradient(circle at 92% 12%, rgba(255, 201, 40, 0.12), transparent 26rem),
        linear-gradient(145deg, var(--bg), var(--bg-soft));
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

.skip-link {
    position: fixed;
    z-index: 100;
    top: 12px;
    left: 12px;
    padding: 10px 14px;
    color: #171300;
    background: var(--accent);
    border-radius: 10px;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: sticky;
    z-index: 20;
    top: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(7, 17, 31, 0.72);
    -webkit-backdrop-filter: blur(20px) saturate(130%);
    backdrop-filter: blur(20px) saturate(130%);
}

.nav {
    width: min(calc(100% - 32px), 1080px);
    min-height: 70px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
    font-weight: 750;
    letter-spacing: 0.01em;
}

.brand img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 11px;
    box-shadow: 0 8px 22px rgba(69, 188, 235, 0.2);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a {
    min-height: 42px;
    padding: 8px 13px;
    display: inline-flex;
    align-items: center;
    color: var(--muted);
    border-radius: 12px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 650;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"] {
    color: var(--text);
    background: var(--panel-strong);
    outline: none;
}

.page {
    width: min(calc(100% - 32px), var(--content));
    margin: 0 auto;
    padding: 68px 0 88px;
}

.hero {
    margin-bottom: 34px;
    text-align: center;
}

.hero-logo {
    width: 92px;
    height: 92px;
    margin-bottom: 18px;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(32, 159, 213, 0.25);
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 12px;
    font-size: clamp(34px, 7vw, 52px);
    line-height: 1.15;
    letter-spacing: -0.035em;
}

.hero-copy {
    max-width: 680px;
    margin: 0 auto;
    color: var(--muted);
    font-size: 17px;
}

.meta {
    margin-top: 18px;
    color: var(--muted);
    font-size: 13px;
}

.content-card,
.feature-card,
.contact-card {
    border: 1px solid var(--border);
    background: var(--panel);
    box-shadow: var(--shadow);
}

.content-card {
    padding: clamp(24px, 6vw, 52px);
    border-radius: var(--radius);
}

.content-card section + section {
    padding-top: 26px;
    margin-top: 26px;
    border-top: 1px solid var(--border);
}

.content-card h2 {
    margin-bottom: 12px;
    font-size: 21px;
    line-height: 1.35;
}

.content-card h3 {
    margin: 20px 0 8px;
    font-size: 16px;
}

.content-card p,
.content-card li {
    color: var(--muted);
}

.content-card strong {
    color: var(--text);
}

.content-card ul,
.content-card ol {
    padding-left: 1.3em;
    margin: 10px 0 0;
}

.content-card li + li {
    margin-top: 8px;
}

.notice {
    padding: 18px 20px;
    margin: 22px 0 0;
    color: var(--text);
    border: 1px solid rgba(255, 201, 40, 0.22);
    border-radius: 16px;
    background: rgba(255, 201, 40, 0.075);
}

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

.feature-card {
    padding: 24px;
    border-radius: 20px;
}

.feature-icon {
    width: 42px;
    height: 42px;
    margin-bottom: 16px;
    display: grid;
    place-items: center;
    color: #171300;
    background: linear-gradient(145deg, var(--accent), var(--accent-strong));
    border-radius: 13px;
    font-size: 20px;
    font-weight: 800;
}

.feature-card h2 {
    margin-bottom: 8px;
    font-size: 18px;
}

.feature-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.actions {
    margin-top: 28px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.button {
    min-height: 48px;
    padding: 11px 19px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #171300;
    background: linear-gradient(145deg, var(--accent), var(--accent-strong));
    border-radius: 14px;
    box-shadow: 0 12px 28px rgba(255, 184, 0, 0.16);
    text-decoration: none;
    font-weight: 750;
}

.button.secondary {
    color: var(--text);
    background: var(--panel-strong);
    border: 1px solid var(--border);
    box-shadow: none;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-1px);
    outline: 3px solid rgba(69, 188, 235, 0.26);
    outline-offset: 2px;
}

.support-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
    gap: 20px;
    align-items: start;
}

.faq {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--panel);
}

.faq + .faq {
    margin-top: 12px;
}

.faq summary {
    padding: 18px 52px 18px 20px;
    position: relative;
    cursor: pointer;
    list-style: none;
    font-weight: 700;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: "+";
    position: absolute;
    top: 50%;
    right: 20px;
    color: var(--accent);
    font-size: 24px;
    transform: translateY(-50%);
}

.faq[open] summary::after {
    content: "−";
}

.faq p {
    padding: 0 20px 18px;
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.contact-card {
    padding: 24px;
    position: sticky;
    top: 92px;
    border-radius: 20px;
}

.contact-card h2 {
    margin-bottom: 8px;
    font-size: 20px;
}

.contact-card p {
    color: var(--muted);
    font-size: 14px;
}

.contact-card .button {
    width: 100%;
}

.small-list {
    padding: 17px 0 0;
    margin: 19px 0 0;
    border-top: 1px solid var(--border);
    list-style: none;
}

.small-list li {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: var(--muted);
    font-size: 13px;
}

.small-list li + li {
    margin-top: 8px;
}

.small-list strong {
    color: var(--text);
    font-weight: 650;
}

.site-footer {
    width: min(calc(100% - 32px), 1080px);
    padding: 24px 0 38px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    color: var(--muted);
    border-top: 1px solid var(--border);
    font-size: 13px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-links a {
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--text);
}

@media (max-width: 720px) {
    .nav {
        min-height: 64px;
    }

    .brand span {
        display: none;
    }

    .brand img {
        width: 38px;
        height: 38px;
    }

    .nav-links {
        gap: 2px;
    }

    .nav-links a {
        padding-inline: 10px;
    }

    .page {
        padding-top: 46px;
    }

    .hero-logo {
        width: 80px;
        height: 80px;
        border-radius: 21px;
    }

    .grid,
    .support-layout {
        grid-template-columns: 1fr;
    }

    .contact-card {
        position: static;
    }

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

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f5f8fc;
        --bg-soft: #eaf1f8;
        --panel: rgba(255, 255, 255, 0.76);
        --panel-strong: rgba(255, 255, 255, 0.94);
        --border: rgba(24, 42, 66, 0.11);
        --text: #102038;
        --muted: #58687e;
        --shadow: 0 22px 60px rgba(48, 78, 111, 0.11);
    }

    .site-header {
        background: rgba(245, 248, 252, 0.76);
        border-bottom-color: rgba(24, 42, 66, 0.08);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        transition: none !important;
    }
}