:root {
    --brand: #F56C27;
    --bg-main: #ffffff;
    --bg-sec: #f5f5f7;
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    --border: #d2d2d7;
    --danger-bg: #FFF0F0;
    --danger-text: #D00000;
    --danger-border: #FFB3B3;
    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
    --bg-main: #000000;
    --bg-sec: #1c1c1e;
    --text-main: #f5f5f7;
    --text-muted: #a1a1a6;
    --border: #38383a;
    --danger-bg: rgba(208, 0, 0, 0.15);
    --danger-text: #ff6b6b;
    --danger-border: #7f1d1d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-family);
    background: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); }
a:hover { text-decoration: underline; }

.container { max-width: 800px; margin: 0 auto; padding: 2.5rem 1.5rem 5rem; }

.topbar {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    background: var(--bg-main);
    position: sticky; top: 0; z-index: 10;
}
.topbar-inner { max-width: 800px; margin: 0 auto; padding: 0 1.5rem; display: flex; align-items: center; gap: 0.6rem; }
.logo { font-size: 1.05rem; font-weight: 700; display: flex; align-items: center; gap: 0.5rem; color: var(--text-main); text-decoration: none; }
.logo-icon { width: 28px; height: 28px; border-radius: 7px; display: block; }
.crumb { color: var(--text-muted); font-size: 0.9rem; }

h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 0.5rem 0 0.25rem; }
.meta { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 2rem; }

h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1rem; margin: 1.25rem 0 0.4rem; }
p { margin: 0.6rem 0; }
ul { margin: 0.6rem 0 0.6rem 1.4rem; }
li { margin-bottom: 0.3rem; }

.mdr-box {
    background: var(--danger-bg);
    color: var(--text-main);
    border: 1px solid var(--danger-border);
    border-radius: 12px;
    padding: 1.2rem 1.4rem;
    margin: 1.5rem 0;
}
.mdr-box h3 { color: var(--danger-text); margin-top: 0; }

.back { display: inline-block; margin-top: 3rem; color: var(--text-muted); font-size: 0.9rem; }