/* 兴趣与线头：内容优先工作台。颜色只取现有主题语义变量。 */
#iwb-overlay {
  --iwb-surface: var(--card-bg, var(--bg-secondary, #f7f5f0));
  --iwb-text: var(--text, var(--text-primary, #262522));
  --iwb-muted: var(--text-secondary, color-mix(in srgb, var(--iwb-text) 58%, transparent));
  --iwb-border: var(--border, color-mix(in srgb, var(--iwb-text) 14%, transparent));
  --iwb-accent: var(--accent, #b78b49); --iwb-danger: var(--danger, #b85858);
  position: fixed; inset: 0; z-index: 9999; display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, #161513 54%, transparent); backdrop-filter: blur(5px); color: var(--iwb-text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
.iwb-overlay-hidden, .iwb-hidden { display: none !important; }
.iwb-panel {
  position: relative; width: min(980px, 96vw); height: min(90vh, 880px); display: flex; flex-direction: column; overflow: hidden;
  background: var(--iwb-surface); color: var(--iwb-text); border: 1px solid var(--iwb-border); border-radius: 20px;
  box-shadow: 0 28px 80px color-mix(in srgb, #000 38%, transparent);
}
.iwb-header { flex: 0 0 auto; display: flex; align-items: center; gap: 8px; min-height: 62px; padding: 8px 18px; border-bottom: 1px solid var(--iwb-border); }
.iwb-title { font-size: 17px; font-weight: 720; letter-spacing: .02em; }
.iwb-spacer { flex: 1; }
.iwb-close { width: 40px; height: 40px; padding: 0; border: 0; border-radius: 50%; background: transparent; color: inherit; cursor: pointer; font-size: 24px; line-height: 1; }
.iwb-close:hover { background: color-mix(in srgb, var(--iwb-text) 8%, transparent); }
.iwb-tabs { flex: 0 0 auto; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-bottom: 1px solid var(--iwb-border); }
.iwb-tab { position: relative; min-width: 0; height: 48px; padding: 0 8px; border: 0; background: transparent; color: var(--iwb-muted); cursor: pointer; font: inherit; font-size: 14px; }
.iwb-tab::after { content: ""; position: absolute; left: 22%; right: 22%; bottom: -1px; height: 2px; border-radius: 2px; background: transparent; }
.iwb-tab:hover { color: var(--iwb-text); background: color-mix(in srgb, var(--iwb-text) 4%, transparent); }
.iwb-tab.iwb-active { color: var(--iwb-text); font-weight: 680; }
.iwb-tab.iwb-active::after { background: var(--iwb-accent); }
.iwb-toolbar { flex: 0 0 auto; display: flex; align-items: center; gap: 8px; min-width: 0; padding: 12px 18px; overflow-x: auto; scrollbar-width: none; }
.iwb-toolbar::-webkit-scrollbar { display: none; }
.iwb-btn, .iwb-search, .iwb-select { box-sizing: border-box; height: 40px; border: 1px solid var(--iwb-border); border-radius: 11px; background: color-mix(in srgb, var(--iwb-surface) 92%, var(--iwb-text) 8%); color: var(--iwb-text); font: inherit; font-size: 13px; line-height: 1; }
.iwb-btn { flex: 0 0 auto; display: inline-flex; align-items: center; justify-content: center; padding: 0 14px; cursor: pointer; white-space: nowrap; }
.iwb-btn:hover { background: color-mix(in srgb, var(--iwb-surface) 84%, var(--iwb-text) 16%); }
.iwb-btn.iwb-primary, .iwb-btn.iwb-active { background: color-mix(in srgb, var(--iwb-accent) 15%, var(--iwb-surface)); border-color: color-mix(in srgb, var(--iwb-accent) 52%, var(--iwb-border)); color: var(--iwb-text); font-weight: 650; }
.iwb-btn.iwb-danger { color: var(--iwb-danger); border-color: color-mix(in srgb, var(--iwb-danger) 42%, var(--iwb-border)); }
.iwb-btn.iwb-ghost { background: transparent; }
.iwb-btn:disabled { opacity: .42; cursor: default; }
.iwb-search { flex: 1 1 260px; min-width: 150px; max-width: 420px; display: flex; align-items: center; gap: 8px; padding: 0 12px; }
.iwb-search:focus-within { outline: none; border-color: color-mix(in srgb, var(--iwb-accent) 55%, var(--iwb-border)); }
#iwb-overlay .iwb-search input[type="search"] { width: 100%; min-width: 0; height: auto; min-height: 0; padding: 0 !important; border: 0 !important; border-radius: 0 !important; outline: 0 !important; box-shadow: none !important; appearance: none; background: transparent !important; color: inherit; font: inherit; font-size: 13px; transform: none !important; }
.iwb-input, .iwb-textarea, .iwb-text { box-sizing: border-box; width: 100%; border: 1px solid var(--iwb-border); border-radius: 11px; background: color-mix(in srgb, var(--iwb-surface) 94%, var(--iwb-text) 6%); color: inherit; padding: 10px 12px; font: inherit; font-size: 13px; }
.iwb-textarea { min-height: 92px; resize: vertical; }
.iwb-select { padding: 0 10px; }
.iwb-list { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 2px 18px 16px; }
.iwb-row-shell { position: relative; overflow: hidden; margin: 8px 0; border-radius: 14px; background: color-mix(in srgb, var(--iwb-surface) 86%, var(--iwb-text) 14%); }
.iwb-swipe-rail { position: absolute; inset: 0 0 0 auto; display: flex; justify-content: flex-end; width: min(340px, 76%); background: color-mix(in srgb, var(--iwb-surface) 76%, var(--iwb-text) 24%); }
.iwb-rail-btn { flex: 1 1 0; min-width: 64px; border: 0; border-left: 1px solid var(--iwb-border); background: transparent; color: var(--iwb-text); font: inherit; font-size: 12px; cursor: pointer; }
.iwb-rail-btn:hover { background: color-mix(in srgb, var(--iwb-text) 8%, transparent); }
.iwb-rail-btn.iwb-danger { color: var(--iwb-danger); }
.iwb-row { position: relative; z-index: 1; display: flex; align-items: center; gap: 12px; min-height: 82px; padding: 15px 16px; background: var(--iwb-surface); transition: transform .22s cubic-bezier(.2,.75,.25,1); touch-action: pan-y; }
.iwb-row-shell.iwb-swiped .iwb-row { transform: translateX(calc(-1 * min(340px, 76%))); }
.iwb-row-main { flex: 1 1 auto; min-width: 0; overflow-wrap: normal; word-break: break-word; }
.iwb-row-title { font-size: 15px; font-weight: 680; line-height: 1.45; white-space: normal; }
.iwb-row-sub, .iwb-row-source { margin-top: 5px; color: var(--iwb-muted); font-size: 12px; line-height: 1.5; }
.iwb-row-meta { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 9px; }
.iwb-chip, .iwb-tag { display: inline-flex; align-items: center; min-height: 22px; padding: 0 8px; border-radius: 999px; background: color-mix(in srgb, var(--iwb-text) 7%, transparent); color: var(--iwb-muted); font-size: 11px; }
.iwb-source-chip { order: -1; }
.iwb-select-control { flex: 0 0 auto; width: 26px; height: 26px; display: grid; place-items: center; }
.iwb-select-control input { position: absolute; opacity: 0; pointer-events: none; }
.iwb-select-control span { width: 20px; height: 20px; border: 1.5px solid var(--iwb-border); border-radius: 6px; }
.iwb-select-control input:checked + span { background: var(--iwb-accent); border-color: var(--iwb-accent); box-shadow: inset 0 0 0 4px var(--iwb-surface); }
.iwb-empty { padding: 52px 0; text-align: center; color: var(--iwb-muted); font-size: 13px; }
.iwb-batchbar { position: absolute; z-index: 8; left: 50%; bottom: 70px; transform: translateX(-50%); display: flex; align-items: center; gap: 6px; max-width: calc(100% - 28px); padding: 7px; border: 1px solid var(--iwb-border); border-radius: 15px; background: var(--iwb-surface); box-shadow: 0 12px 34px color-mix(in srgb, #000 26%, transparent); }
.iwb-batch-count { padding: 0 7px; color: var(--iwb-muted); font-size: 12px; white-space: nowrap; }
.iwb-pager { flex: 0 0 auto; display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 62px; padding: 8px 14px; border-top: 1px solid var(--iwb-border); }
.iwb-pager-info { color: var(--iwb-muted); font-size: 12px; }
.iwb-modal-mask { position: absolute; inset: 0; z-index: 20; display: flex; align-items: center; justify-content: center; padding: 18px; background: color-mix(in srgb, #111 44%, transparent); backdrop-filter: blur(3px); }
.iwb-modal { box-sizing: border-box; width: min(480px, 100%); max-height: min(82vh, 760px); overflow-y: auto; padding: 20px; border: 1px solid var(--iwb-border); border-radius: 17px; background: var(--iwb-surface); color: var(--iwb-text); box-shadow: 0 24px 70px color-mix(in srgb, #000 34%, transparent); }
.iwb-modal h4 { margin: 0 0 14px; font-size: 17px; }
.iwb-modal-section { margin-top: 14px; }
.iwb-modal-section-label, .iwb-field-label { font-size: 13px; font-weight: 680; }
.iwb-modal-section-note, .iwb-import-help { margin: 5px 0 9px; color: var(--iwb-muted); font-size: 12px; line-height: 1.55; }
.iwb-modal-btns, .iwb-import-sources { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
/* 弹窗动作行：统一靠右下角，且比筛选格子（38px）轻一档，不抢内容的视觉权重。
   .iwb-modal-close 内的关闭按钮与动作按钮同尺寸（复审 P3：否则移动端关闭 42px vs 动作 34px）。
   模式选择器（.iwb-import-sources 的导入 JSON / AI 生成）不在此列——它比提交动作大一级是有意的层级。 */
.iwb-modal-btns { justify-content: flex-end; }
.iwb-modal-btns .iwb-btn, .iwb-modal-close .iwb-btn { height: 30px; padding: 0 12px; font-size: 12px; border-radius: 9px; }
.iwb-modal-close { margin-top: 16px; display: flex; justify-content: flex-end; }
.iwb-domain-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.iwb-domain-item { display: grid; place-items: center; min-height: 38px; padding: 0 6px; border: 1px solid var(--iwb-border); border-radius: 11px; background: transparent; color: inherit; cursor: pointer; font-size: 12px; }
.iwb-domain-item.iwb-selected { border-color: var(--iwb-accent); background: color-mix(in srgb, var(--iwb-accent) 17%, var(--iwb-surface)); font-weight: 650; }
.iwb-field { margin-top: 12px; }
.iwb-create-footer { display: flex; align-items: end; gap: 12px; margin-top: 18px; }
.iwb-create-type { display: grid; gap: 6px; }
.iwb-create-actions { display: flex; gap: 8px; margin-left: auto; }
.iwb-import-source.iwb-selected { border-color: var(--iwb-accent); background: color-mix(in srgb, var(--iwb-accent) 15%, var(--iwb-surface)); }
.iwb-import-step-label { margin-bottom: 10px; font-size: 14px; font-weight: 680; }
.iwb-import-source-panel { min-height: 100px; }
.iwb-import-file-name, .iwb-import-message, .iwb-import-ref, .iwb-import-readonly { margin-top: 6px; color: var(--iwb-muted); font-size: 12px; }
.iwb-import-summary { margin-bottom: 10px; padding: 9px 11px; border-radius: 10px; background: color-mix(in srgb, var(--iwb-accent) 10%, transparent); font-size: 12px; }
.iwb-import-preview-list { max-height: 50vh; overflow-y: auto; }
.iwb-import-card { margin: 8px 0; padding: 11px; border: 1px solid var(--iwb-border); border-radius: 12px; }
.iwb-import-card-head { display: flex; align-items: center; gap: 8px; }
.iwb-import-field { display: block; margin-top: 9px; }
.iwb-import-field-label { display: block; margin-bottom: 4px; color: var(--iwb-muted); font-size: 12px; }
.iwb-import-field .iwb-select { width: 100%; }
.iwb-import-diffs, .iwb-import-errors, .iwb-import-warnings, .iwb-import-conversion { margin-top: 9px; padding: 8px; border-radius: 9px; background: color-mix(in srgb, var(--iwb-text) 5%, transparent); font-size: 12px; }
.iwb-row-main[data-iwb-thread-open] { cursor: pointer; }
.iwb-row-main[data-iwb-thread-open]:focus-visible { outline: 2px solid color-mix(in srgb, var(--iwb-accent) 70%, transparent); outline-offset: 5px; border-radius: 8px; }
.iwb-thread-detail { position: absolute; inset: 0; z-index: 12; display: flex; flex-direction: column; background: var(--iwb-surface); }
.iwb-thread-detail-head { flex: 0 0 auto; display: flex; align-items: center; min-height: 62px; padding: 8px 18px; border-bottom: 1px solid var(--iwb-border); }
.iwb-thread-detail-content { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 28px clamp(18px, 5vw, 64px) 40px; }
.iwb-detail-summary { max-width: 720px; margin: 0 auto 30px; }
.iwb-detail-summary h2 { margin: 0 0 8px; font-size: clamp(20px, 3vw, 28px); line-height: 1.35; }
.iwb-detail-summary > div { color: var(--iwb-muted); font-size: 12px; line-height: 1.6; }
.iwb-thread-timeline { position: relative; max-width: 720px; margin: 0 auto; }
.iwb-thread-timeline::before { content: ""; position: absolute; top: 10px; bottom: 18px; left: 4px; width: 1px; background: var(--iwb-border); }
.iwb-thread-node { position: relative; display: grid; grid-template-columns: 10px minmax(0, 1fr); gap: 18px; padding: 0 0 34px; }
.iwb-node-dot { position: relative; z-index: 1; width: 8px; height: 8px; margin-top: 7px; border: 1px solid var(--iwb-border); border-radius: 50%; background: var(--iwb-surface); }
.iwb-thread-origin .iwb-node-dot { border-color: var(--iwb-accent); background: var(--iwb-accent); }
.iwb-node-time { color: var(--iwb-muted); font-size: 11px; letter-spacing: .02em; }
.iwb-node-kicker { margin-top: 5px; color: var(--iwb-muted); font-size: 12px; }
.iwb-node-kicker > span:first-child { color: var(--iwb-text); font-weight: 680; }
.iwb-state-turn { display: inline-flex; margin-left: 8px; padding: 2px 7px; border-radius: 999px; background: color-mix(in srgb, var(--iwb-accent) 12%, transparent); color: var(--iwb-text); font-size: 10px; }
.iwb-node-summary { margin-top: 9px; font-size: 14px; line-height: 1.72; white-space: pre-wrap; }
.iwb-node-next { display: grid; gap: 4px; margin-top: 12px; color: var(--iwb-muted); font-size: 12px; line-height: 1.6; }
.iwb-node-next b { color: var(--iwb-text); font-size: 11px; }
.iwb-node-refs { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.iwb-node-refs span { max-width: 100%; overflow-wrap: anywhere; padding: 4px 8px; border: 1px solid var(--iwb-border); border-radius: 8px; color: var(--iwb-muted); font-size: 11px; }
.iwb-detail-more { display: flex; justify-content: center; max-width: 720px; margin: 0 auto; padding: 8px 0 24px; }
.iwb-detail-error { display: grid; place-items: center; gap: 14px; min-height: 55vh; color: var(--iwb-muted); font-size: 13px; }
@media (max-width: 680px) {
  .iwb-panel { width: 100vw; height: 100dvh; border-radius: 0; border: 0; }
  .iwb-header { min-height: 58px; padding: 7px 10px; gap: 5px; }
  .iwb-title { font-size: 15px; }
  .iwb-header .iwb-btn, .iwb-close { height: 42px; }
  .iwb-header .iwb-btn { padding: 0 10px; }
  .iwb-tab { height: 46px; font-size: 13px; }
  .iwb-toolbar { padding: 10px; gap: 7px; }
  .iwb-btn, .iwb-search, .iwb-select { height: 42px; }
  .iwb-modal-btns .iwb-btn, .iwb-modal-close .iwb-btn { height: 34px; }
  .iwb-search { flex-basis: 152px; }
  .iwb-list { padding: 0 10px 12px; }
  .iwb-row { min-height: 86px; padding: 14px; }
  .iwb-domain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .iwb-create-footer { align-items: end; }
  .iwb-batchbar { bottom: 64px; overflow-x: auto; }
  .iwb-thread-detail-head { min-height: 58px; padding: 7px 10px; }
  .iwb-thread-detail-content { padding: 22px 16px 34px; }
  .iwb-thread-node { gap: 14px; }
}

/* ── 刀 A4 尾巴（2026-09-05，塔拉真机报「研究线详情顶部还是被压坏」）─────────────
   病根不是漏扫，是**垫了但被绕过**：
   shim 把 padding-top 垫在 .iwb-panel 上，而 .iwb-thread-detail 是
   `position: absolute; inset: 0`。绝对定位元素的包含块是父级的 **padding box**，
   top:0 对齐的是 padding 的上沿而不是内容上沿 —— 于是这一层直接盖住那 52px，
   贴回屏幕顶端。列表页好好的、一点进研究线详情就坏，就是这个。

   垫在 section 自己身上而不是它的 head：section 带 --iwb-surface 底色，
   padding 区域会把底色一直铺到状态栏底下，不留灰带接缝（垫 head 则 head 的
   min-height 与底部边框都要跟着算，多一个魔法常数）。

   🔴 box-sizing 必须一起写：本仓库**没有**全局 border-box（只逐选择器加），
   content-box 下加 padding-top 会让 inset:0 的 section 比包含块高出一个 inset，
   底部溢出。style.css:2002 那条「height 与 padding-top 必须一起加」是同一课。

   只在 shim 真的生效时命中：.azoth-safe-area-shim 这个 class 只有原生端才会挂，
   web 上这条规则永远不匹配，逐字节零变化。 */
.azoth-safe-area-shim .iwb-thread-detail {
    box-sizing: border-box;
    padding-top: var(--azoth-safe-top);
}