.ab { max-width: 640px; margin: 0 auto; padding: calc(env(safe-area-inset-top) + 10px) 18px calc(env(safe-area-inset-bottom) + 40px); }
.ab-top { display: flex; align-items: center; gap: 6px; margin-bottom: 18px; }
.ab-back { width: 38px; height: 38px; margin-left: -8px; display: grid; place-items: center; border-radius: 50%; color: var(--text-2); }
.ab-back:active { background: var(--surface-2); }
.ab-back svg { width: 22px; height: 22px; }
.ab .brand { font-weight: 800; letter-spacing: .14em; font-size: .95rem; }
.ab h1 { margin-bottom: 10px; font-size: 1.4rem; line-height: 1.25; letter-spacing: -.01em; }
.ab h2 { margin-bottom: 10px; font-size: 1.02rem; }
.ab p { margin: 0 0 10px; font-size: .9rem; line-height: 1.6; color: var(--text-2); }
.ab a { color: var(--accent); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); text-underline-offset: 3px; }
.ab b { color: var(--text); font-weight: 600; }
.ab code { padding: 1px 6px; border-radius: 6px; background: var(--surface-2); font-size: .8rem; word-break: break-all; }
.ab-intro { margin-bottom: 20px; }
.ab-meta { font-size: .8rem !important; color: var(--text-3) !important; }
.ab-sum { margin-bottom: 26px; padding: 16px 16px 8px; border-radius: 18px; border: 1px solid var(--accent-line); background: linear-gradient(150deg, var(--accent-soft), var(--surface) 70%); }
.ab ul { list-style: none; display: flex; flex-direction: column; gap: 9px; margin: 0 0 12px; padding: 0; }
.ab li { position: relative; padding-left: 16px; font-size: .88rem; line-height: 1.55; color: var(--text-2); }
.ab li::before { content: ''; position: absolute; left: 1px; top: .62em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.ab-sec { margin-bottom: 26px; padding-top: 20px; border-top: 1px solid var(--line); }
.ab details { margin-bottom: 8px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); }
.ab summary { position: relative; display: block; padding: 13px 40px 13px 14px; font-size: .9rem; font-weight: 600; cursor: pointer; list-style: none; }
.ab summary::-webkit-details-marker { display: none; }
.ab summary::after { content: ''; position: absolute; right: 16px; top: 50%; width: 7px; height: 7px; margin-top: -6px; border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: rotate(45deg); transition: transform .25s ease; }
.ab details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.ab details p { padding: 0 14px; }
.ab details p:last-child { padding-bottom: 6px; margin-bottom: 8px; }
.ab-warn { padding: 12px 14px !important; border-radius: 14px; border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent); background: color-mix(in srgb, var(--warn) 8%, transparent); }
.ab-note { font-size: .78rem !important; color: var(--text-3) !important; }
.ab-foot { margin-top: 10px; text-align: center; font-size: .76rem !important; color: var(--text-3) !important; }