/* ============================================================
   Riva 移动工作区
   ------------------------------------------------------------
   ≤720px：对话主屏 + 一张整理 Bottom Sheet + 一次一个全屏任务。
   它刻意不读取桌面 v3 的卡片比例、排序和固定状态。
   ============================================================ */

.assistant-mobile-bar,
.assistant-mobile-summary-peek,
.assistant-mobile-sheet-handle,
.assistant-mobile-sheet-close {
  display: none;
}

@media (max-width: 720px), (max-height: 520px) and (max-width: 900px) {
  .assistant-page {
    --assistant-mobile-top: calc(52px + env(safe-area-inset-top));
    --assistant-mobile-bottom: calc(12px + env(safe-area-inset-bottom));
    --assistant-mobile-sheet: 54px;
    --assistant-mobile-ease: cubic-bezier(0.22, 1, 0.36, 1);
  }

  .assistant-page.assistant-state-chat {
    min-height: 100dvh;
    overscroll-behavior-y: none;
  }

  .assistant-page.assistant-state-chat .assistant-chat-section {
    min-height: 100dvh;
    padding: var(--assistant-mobile-top) 0 calc(var(--assistant-dock-h, 144px) + var(--assistant-mobile-sheet) + 18px);
  }

  .assistant-page.assistant-state-chat .assistant-chat-shell {
    min-height: calc(100dvh - var(--assistant-mobile-top));
  }

  .assistant-page.assistant-state-chat .assistant-conversation-bar {
    display: none;
  }

  .assistant-mobile-bar {
    position: fixed;
    inset: 0 0 auto;
    z-index: 44;
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    align-items: end;
    height: var(--assistant-mobile-top);
    padding: env(safe-area-inset-top) 12px 0;
    background: var(--paper);
    border-bottom: 1px solid rgba(28, 28, 30, 0.055);
  }

  .assistant-mobile-bar button {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    color: rgba(36, 51, 47, 0.72);
    background: none;
    border: 0;
    border-radius: 10px;
  }

  .assistant-mobile-bar svg,
  .assistant-mobile-summary-peek svg,
  .assistant-mobile-sheet-close svg {
    width: 21px;
    height: 21px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.9;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .assistant-mobile-bar__title {
    min-width: 0;
    margin: 0;
    overflow: hidden;
    color: rgba(36, 51, 47, 0.82);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 44px;
    text-align: center;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .assistant-mobile-menu {
    position: absolute;
    top: calc(100% - 4px);
    right: 10px;
    z-index: 2;
    display: grid;
    min-width: 166px;
    padding: 6px;
    background: #FCFBF7;
    border: 1px solid rgba(28, 28, 30, 0.09);
    border-radius: 14px;
    box-shadow: 0 12px 28px -20px rgba(28, 28, 24, 0.32);
    transform-origin: top right;
    animation: assistantMobileMenuIn 160ms var(--assistant-mobile-ease);
  }

  .assistant-mobile-menu[hidden] { display: none; }

  .assistant-mobile-menu button {
    display: block;
    width: 100%;
    min-height: 42px;
    padding: 0 12px;
    color: rgba(36, 51, 47, 0.82);
    text-align: left;
    font: inherit;
    font-size: 14px;
  }

  .assistant-state-chat .assistant-thread {
    min-height: 46vh;
    padding-top: 4px;
  }

  .assistant-chat-empty {
    min-height: 34vh;
    display: block;
    padding-top: clamp(22vh, 30svh, 38vh);
    color: rgba(54, 50, 45, 0.56);
    font-family: var(--font-brand-latin, inherit);
    font-size: clamp(25px, 7vw, 31px);
    letter-spacing: 0;
    text-align: center;
  }

  .assistant-state-chat .assistant-composer-dock {
    z-index: 42;
    padding: 20px 12px var(--assistant-mobile-bottom);
    transform: translateY(calc(-1 * var(--assistant-mobile-vv-offset, 0px)));
    background: linear-gradient(180deg, rgba(251, 249, 245, 0), var(--paper) 30%);
  }

  .assistant-blank-greeting {
    margin: 0 auto 14px;
    color: rgba(54, 50, 45, 0.65);
    font-family: var(--font-brand-latin, inherit);
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.35;
    text-align: center;
  }

  .assistant-composer--chat {
    min-height: 54px;
    padding: 6px 7px 6px 15px;
    border-radius: 26px;
  }

  .assistant-composer--chat .assistant-actions { gap: 6px; }

  .assistant-composer--chat .assistant-icon-button {
    width: 40px;
    height: 40px;
    flex-basis: 40px;
    border-radius: 50%;
  }

  /* idle 仍是一颗正常的绿色圆按钮；disabled 仅防空请求，不把它画成灰掉。 */
  .assistant-composer--chat .assistant-icon-button--send[disabled]:not(.is-generating) {
    opacity: 0.72;
    color: var(--paper-on-dark);
    background: var(--teal);
    border-color: var(--teal);
  }

  .assistant-smallprint { margin-top: 7px; }

  .assistant-mobile-summary-peek {
    position: fixed;
    right: 12px;
    bottom: calc(var(--assistant-dock-h, 118px) + var(--assistant-mobile-bottom));
    left: 12px;
    z-index: 41;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    min-height: 52px;
    padding: 14px 15px 8px;
    color: rgba(36, 51, 47, 0.82);
    background: #FCFBF7;
    border: 1px solid rgba(28, 28, 30, 0.075);
    border-radius: 16px;
    box-shadow: 0 8px 22px -20px rgba(28, 28, 24, 0.25);
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    text-align: left;
  }

  .assistant-mobile-summary-peek__handle {
    position: absolute;
    top: 6px;
    left: 50%;
    width: 30px;
    height: 3px;
    border-radius: 99px;
    background: rgba(36, 51, 47, 0.18);
    transform: translateX(-50%);
  }

  .assistant-mobile-summary-peek__status {
    justify-self: end;
    margin-right: 7px;
    color: rgba(36, 51, 47, 0.46);
    font-size: 12px;
    font-weight: 500;
  }

  .assistant-mobile-summary-peek svg { width: 18px; height: 18px; }

  .assistant-page.assistant-mobile-summary-open .assistant-mobile-summary-peek { visibility: hidden; }

  /* Bottom Sheet：review 内容仍是原来的安全投影，只更换移动端呈现容器。 */
  .assistant-page.assistant-mobile-summary-open .assistant-review {
    position: fixed;
    inset: auto 0 0;
    z-index: 65;
    display: flex;
    flex-direction: column;
    height: min(52dvh, 520px);
    padding: 0 16px calc(14px + env(safe-area-inset-bottom));
    overflow: hidden;
    background: #FCFBF7;
    border: 1px solid rgba(28, 28, 30, 0.08);
    border-bottom: 0;
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -12px 32px -28px rgba(28, 28, 24, 0.35);
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition: height 280ms var(--assistant-mobile-ease);
    animation: assistantMobileSheetIn 280ms var(--assistant-mobile-ease);
  }

  .assistant-page.assistant-mobile-summary-open[data-mobile-summary-detent="full"] .assistant-review {
    height: min(92dvh, 820px);
  }

  .assistant-page.assistant-mobile-summary-open .assistant-review__head {
    position: relative;
    flex: 0 0 auto;
    min-height: 58px;
    margin: 0;
    padding: 16px 44px 0;
    text-align: center;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-review__title {
    margin: 0;
    color: rgba(36, 51, 47, 0.84);
    font-family: inherit;
    font-size: 16px;
    font-weight: 650;
    line-height: 32px;
  }

  .assistant-mobile-sheet-handle,
  .assistant-mobile-sheet-close { display: block; }

  .assistant-mobile-sheet-handle {
    position: absolute;
    top: 6px;
    left: 50%;
    width: 48px;
    height: 22px;
    padding: 0;
    background: none;
    border: 0;
    transform: translateX(-50%);
  }

  .assistant-mobile-sheet-handle span {
    display: block;
    width: 30px;
    height: 3px;
    margin: auto;
    border-radius: 99px;
    background: rgba(36, 51, 47, 0.18);
  }

  .assistant-mobile-sheet-close {
    position: absolute;
    top: 16px;
    right: 0;
    width: 36px;
    height: 36px;
    padding: 0;
    color: rgba(36, 51, 47, 0.65);
    background: none;
    border: 0;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-review__body,
  .assistant-page.assistant-mobile-summary-open .assistant-ws-empty {
    flex: 1 1 auto;
    min-height: 0;
    padding: 0 2px 16px;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: none;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-review__note {
    flex: 0 0 auto;
    margin: 0;
    padding: 10px 2px 0;
    font-size: 11.5px;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-ws-empty {
    display: grid;
    align-content: center;
    gap: 18px;
    text-align: left;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-ws-summary-empty {
    text-align: center;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-ws-summary-empty__mark { display: none; }

  .assistant-page.assistant-mobile-summary-open .assistant-ws-starters__card {
    overflow: hidden;
    border: 1px solid rgba(28, 28, 30, 0.075);
    border-radius: 14px;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-ws-starters__card > * {
    border-radius: 0;
    box-shadow: none;
  }

  .assistant-page.assistant-mobile-summary-open .assistant-review-backdrop {
    position: fixed;
    inset: 0;
    z-index: 64;
    display: block;
    background: rgba(28, 28, 24, 0.08);
  }

  /* 搜索、记录、记忆是一个全屏任务空间；同一时刻 records drawer 只承载一个面板。 */
  .assistant-page.assistant-mobile-task-open {
    overflow: hidden;
  }

  .assistant-page.assistant-mobile-task-open .assistant-records {
    z-index: 70;
    inset: 0;
    display: flex !important;
    flex-direction: column;
    width: 100vw;
    max-width: none;
    height: 100dvh;
    padding: calc(10px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom));
    overflow: hidden;
    background: var(--paper);
    border: 0;
    box-shadow: none;
    animation: assistantMobileTaskIn 240ms var(--assistant-mobile-ease);
  }

  .assistant-page.assistant-mobile-task-open .assistant-mobile-bar,
  .assistant-page.assistant-mobile-task-open .assistant-composer-dock,
  .assistant-page.assistant-mobile-task-open .assistant-mobile-summary-peek {
    visibility: hidden;
    pointer-events: none;
  }

  .assistant-page.assistant-mobile-task-open .assistant-records__head {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    align-items: center;
    min-height: 44px;
    margin: 0 0 14px;
  }

  .assistant-page.assistant-mobile-task-open .assistant-records__head h2 {
    grid-column: 2;
    overflow: hidden;
    margin: 0;
    font-family: inherit;
    font-size: 16px;
    font-weight: 650;
    text-align: center;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .assistant-page.assistant-mobile-task-open .assistant-records__collapse {
    grid-column: 1;
    grid-row: 1;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    color: rgba(36, 51, 47, 0.72);
    background: none;
    border: 0;
  }

  .assistant-page.assistant-mobile-task-open .assistant-records__collapse svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.9;
  }

  .assistant-page.assistant-mobile-task-open .assistant-tabs,
  .assistant-page.assistant-mobile-task-open .assistant-record-caption,
  .assistant-page.assistant-mobile-task-open .assistant-drawer-bottom {
    display: none;
  }

  .assistant-page.assistant-mobile-task-open .assistant-record-panel:not([hidden]) {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
    flex-direction: column;
    overflow: hidden;
  }

  .assistant-page.assistant-mobile-task-open .assistant-search-panel { gap: 14px; }

  .assistant-page.assistant-mobile-task-open .assistant-search-body,
  .assistant-page.assistant-mobile-task-open .assistant-history-list,
  .assistant-page.assistant-mobile-task-open .assistant-memory-drawer {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .assistant-page.assistant-mobile-task-open .assistant-panel-empty {
    display: grid;
    flex: 1 1 auto;
    min-height: 0;
    place-content: center;
    text-align: center;
  }

  @media (prefers-color-scheme: dark) {
    /* 当前产品没有全站主题选择器。不能只因设备为暗色就翻转 Assistant，
       否则会偏离桌面端的暖白默认态。宿主明确给 html 标记 dark 时才启用。 */
    html[data-theme="dark"] .assistant-page.assistant-state-chat,
    html[data-theme="dark"] .assistant-mobile-bar,
    html[data-theme="dark"] .assistant-page.assistant-state-chat .assistant-main,
    html[data-theme="dark"] .assistant-page.assistant-state-chat .assistant-chat-section,
    html[data-theme="dark"] .assistant-page.assistant-state-chat .assistant-chat-shell,
    html[data-theme="dark"] .assistant-page.assistant-mobile-task-open .assistant-records { background: #1D1D1A; }
    html[data-theme="dark"] .assistant-mobile-bar,
    html[data-theme="dark"] .assistant-page.assistant-mobile-task-open .assistant-records { border-color: rgba(255,255,255,.08); }
    html[data-theme="dark"] .assistant-mobile-bar__title,
    html[data-theme="dark"] .assistant-mobile-bar button,
    html[data-theme="dark"] .assistant-mobile-summary-peek,
    html[data-theme="dark"] .assistant-blank-greeting,
    html[data-theme="dark"] .assistant-chat-empty { color: rgba(241, 239, 232, .84); }
    html[data-theme="dark"] .assistant-mobile-menu,
    html[data-theme="dark"] .assistant-mobile-summary-peek,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-review,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-ws-empty,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-ws-starters__card,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-ws-summary-empty { background: #282824 !important; border-color: rgba(255,255,255,.09); }
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-review__title { color: rgba(241, 239, 232, .9); }
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-ws-summary-empty p,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-ws-summary-empty p + p,
    html[data-theme="dark"] .assistant-page.assistant-mobile-summary-open .assistant-review__note,
    html[data-theme="dark"] .assistant-smallprint { color: rgba(232, 229, 220, .58); }
    html[data-theme="dark"] .assistant-page.assistant-state-chat .assistant-composer-dock { background: linear-gradient(180deg, rgba(29,29,26,0), #1D1D1A 30%); }
    html[data-theme="dark"] .assistant-composer--chat { background: #292925; border-color: rgba(255,255,255,.10); }
    html[data-theme="dark"] .assistant-composer--chat textarea { color: rgba(244,242,235,.9); }
  }

  @media (prefers-reduced-motion: reduce) {
    .assistant-mobile-menu,
    .assistant-page.assistant-mobile-summary-open .assistant-review,
    .assistant-page.assistant-mobile-task-open .assistant-records { animation: none; }
  }
}

@keyframes assistantMobileMenuIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
@keyframes assistantMobileSheetIn { from { transform: translateY(28px); opacity: .75; } to { transform: translateY(0); opacity: 1; } }
@keyframes assistantMobileTaskIn { from { transform: translateX(18px); opacity: .7; } to { transform: none; opacity: 1; } }