body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: #f7f8fa;
    color: #1f2933;
    line-height: 1.6;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

header {
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    color: #f8fafc;
    padding: 24px 16px;
}

header .container {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-group img {
    width: 56px;
    height: 56px;
    border-radius: 12px;
}

.nav-links {
    display: flex;
    gap: 16px;
    font-weight: 600;
}

.hero {
    text-align: center;
    padding: 72px 16px 48px;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
}

.hero h1 {
    margin: 0;
    font-size: clamp(32px, 5vw, 48px);
}

.hero p {
    margin: 16px auto 0;
    max-width: 640px;
    font-size: 18px;
    color: #475569;
}

.section {
    padding: 56px 16px;
}

.section.alt {
    background: #ffffff;
}

.container {
    max-width: 960px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.feature-card {
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.04), rgba(59, 130, 246, 0.08));
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
}

.feature-card h3 {
    margin-top: 0;
    color: #1d4ed8;
}

.screenshot-placeholder {
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.1), rgba(59, 130, 246, 0.15));
    border-radius: 20px;
    aspect-ratio: 9 / 16;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1d4ed8;
    font-weight: 600;
    font-size: 20px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.step-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    border: 1px solid #e2e8f0;
}

.step-card span {
    display: inline-block;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #1d4ed8;
    color: #ffffff;
    text-align: center;
    line-height: 36px;
    font-weight: 600;
    margin-bottom: 12px;
}

footer {
    background: #0f172a;
    color: #cbd5f5;
    padding: 32px 16px;
    font-size: 14px;
}

footer .container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
}

.policy-container {
    max-width: 820px;
    margin: 0 auto;
    background: #ffffff;
    padding: 48px 32px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(15, 23, 42, 0.08);
}

.policy-container h1 {
    margin-top: 0;
    color: #0f172a;
}

.policy-meta {
    color: #475569;
    margin-bottom: 32px;
}

.policy-container h2 {
    margin-top: 32px;
    color: #1d4ed8;
}

.policy-keyword {
    font-weight: 600;
    color: #0f172a;
}

.support-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.04);
}

.card h2 {
    margin-top: 0;
    color: #1d4ed8;
}

.faq-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.faq-list li + li {
    margin-top: 16px;
    border-top: 1px solid #e2e8f0;
    padding-top: 16px;
}

.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.12);
    color: #1d4ed8;
    font-size: 13px;
    font-weight: 600;
    margin-right: 8px;
}

.notice {
    background: rgba(22, 163, 74, 0.12);
    color: #166534;
    padding: 12px 16px;
    border-radius: 12px;
    margin-top: 16px;
    font-size: 14px;
}

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

blockquote {
    margin: 0;
    padding-left: 16px;
    border-left: 4px solid #1d4ed8;
    color: #334155;
}

.link-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.link-group a {
    font-weight: 600;
}

@media (max-width: 600px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .nav-links {
        flex-wrap: wrap;
        gap: 8px;
    }

    footer .container {
        align-items: flex-start;
    }
}