@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
    --bg: #101216;
    --panel: #171a20;
    --border: #2a2f38;
    --text: #f3f4f6;
    --muted: #a5adba;
    --accent: #26384d;
    --max-width: 760px;
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: 'Noto Sans JP', sans-serif;
}

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

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

.site-shell {
    min-height: 100vh;
}

.site-header {
    border-bottom: 1px solid var(--border);
}

.site-header-inner,
.page-frame {
    width: min(calc(100% - 32px), var(--max-width));
    margin: 0 auto;
}

.site-header-inner {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.site-title {
    font-size: 1rem;
    font-weight: 700;
}

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

.nav-link {
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.92rem;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
    background: var(--panel);
    color: var(--text);
    outline: none;
}

.page-frame {
    padding: 24px 0 40px;
}

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

.simple-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.simple-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.simple-label {
    font-size: 1rem;
    font-weight: 500;
}

.button-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #1f242c;
    color: var(--text);
    font-size: 0.95rem;
}

.button:hover,
.button:focus-visible {
    background: #272d37;
    outline: none;
}

.button-primary {
    background: var(--accent);
    border-color: #38506b;
}

.button-primary:hover,
.button-primary:focus-visible {
    background: #31485f;
}

.download-page {
    display: grid;
    gap: 16px;
}

.download-header {
    display: flex;
    align-items: center;
    gap: 14px;
}

.download-icon {
    width: 56px;
    height: 56px;
    padding: 10px;
    background: #12151a;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    flex: 0 0 auto;
}

.download-title {
    margin: 0;
    font-size: 1.35rem;
}

.download-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.os-grid {
    display: grid;
    gap: 12px;
}

.os-card {
    padding: 14px 16px;
    background: #1b1f26;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.os-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.os-name {
    font-size: 1rem;
    font-weight: 600;
}

.os-status {
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.82rem;
    color: var(--muted);
    background: #14181e;
    border: 1px solid var(--border);
}

.os-status.is-supported {
    color: var(--text);
    border-color: #38506b;
    background: #223241;
}

.os-status.is-dev {
    background: #2b2418;
    border-color: #544329;
    color: #d8c29d;
}

.os-status.is-planned {
    background: #14181e;
}

.os-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .site-header-inner,
    .simple-item,
    .download-header,
    .os-card-header {
        flex-direction: column;
        align-items: flex-start;
    }
}