/* ============================================================
   Messages — StudyHub
   A WhatsApp-style private inbox: two-pane on desktop, single
   pane with slide-over chat on mobile. Refined, minimal,
   "computer" aesthetic with smooth motion.
   ============================================================ */

.messages-page { background: var(--color-bg-secondary); }
.messages-page main {
  height: 100vh; height: 100dvh;
  padding-top: var(--navbar-height);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.msg-shell {
  flex: 1;
  min-height: 0;
  display: flex;
  width: 100%;
  background: var(--color-bg-primary);
  overflow: hidden;
}
.msg-shell svg { flex: none; }

/* ── Mute banner (禁言提示 + 申诉) ──────────────────────────── */
.msg-mutebar {
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px clamp(14px, 4vw, 28px);
  background: linear-gradient(135deg, rgba(255, 59, 48, 0.10), rgba(255, 149, 0, 0.07));
  border-bottom: 1px solid rgba(255, 59, 48, 0.24);
  color: var(--color-text-primary);
}
.msg-mutebar[hidden] { display: none; }
.msg-mutebar__icon {
  flex: none; width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  background: rgba(255, 59, 48, 0.14); color: var(--color-error);
}
.msg-mutebar__icon svg { width: 18px; height: 18px; }
.msg-mutebar__main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.msg-mutebar__title { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.msg-mutebar__reason, .msg-mutebar__status { font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.msg-mutebar__btn {
  flex: none; border: none; cursor: pointer;
  padding: 8px 16px; border-radius: var(--radius-full);
  background: var(--color-error); color: #fff;
  font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold);
  transition: filter var(--transition-fast), transform var(--transition-fast);
}
.msg-mutebar__btn:hover { filter: brightness(1.05); transform: translateY(-1px); }
.msg-mutebar__btn:active { transform: scale(0.97); }

/* ── Panes ─────────────────────────────────────────────────── */
.msg-pane { display: flex; flex-direction: column; min-height: 0; height: 100%; }
.msg-pane--list {
  width: 360px; flex: none;
  border-right: 1px solid var(--glass-border);
  background: var(--color-bg-primary);
}
.msg-pane--chat {
  flex: 1; min-width: 0;
  position: relative;
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(0,113,227,0.05), transparent 55%),
    radial-gradient(100% 80% at 0% 100%, rgba(88,86,214,0.05), transparent 55%),
    var(--color-bg-secondary);
}

/* ============================================================
   Conversation list
   ============================================================ */
.msg-list__head {
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
  border-bottom: 1px solid var(--glass-border);
  position: relative; z-index: 3;
  background: var(--color-bg-primary);
}
.msg-list__titlebar { display: flex; align-items: baseline; justify-content: space-between; gap: var(--spacing-sm); margin-bottom: var(--spacing-sm); }
.msg-list__title { font-size: var(--font-size-2xl); font-weight: var(--font-weight-bold); letter-spacing: -0.02em; }
.msg-list__hint { font-size: var(--font-size-xs); color: var(--color-text-tertiary); }

.msg-search { position: relative; display: flex; align-items: center; }
.msg-search__icon { position: absolute; left: 12px; color: var(--color-text-tertiary); display: inline-flex; pointer-events: none; }
.msg-search__input {
  width: 100%; height: 42px; padding: 0 38px 0 38px;
  border: 1px solid var(--glass-border); border-radius: var(--radius-full);
  background: var(--color-surface-glass); color: var(--color-text-primary);
  font-size: var(--font-size-sm); font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.msg-search__input:focus { outline: none; border-color: var(--color-accent-primary); box-shadow: 0 0 0 3px rgba(0,113,227,0.14); background: #fff; }
.msg-search__clear {
  position: absolute; right: 10px; width: 22px; height: 22px; border: none; cursor: pointer;
  border-radius: 50%; background: var(--color-bg-tertiary); color: var(--color-text-secondary);
  display: none; align-items: center; justify-content: center;
}
.msg-search.has-value .msg-search__clear { display: inline-flex; }

.msg-search-results {
  position: absolute; left: var(--spacing-md); right: var(--spacing-md); top: calc(100% - 4px);
  background: var(--color-surface); backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl); overflow: hidden; z-index: 20; max-height: 60vh; overflow-y: auto;
  animation: msg-pop 0.2s var(--transition-smooth);
}
.msg-search-result { display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px 14px; border: none; background: transparent; cursor: pointer; text-align: left; transition: background var(--transition-fast); }
.msg-search-result:hover { background: var(--color-surface-glass-hover); }
.msg-search-result__main { min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.msg-search-result__name { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.msg-search-result__sub { font-size: var(--font-size-xs); color: var(--color-text-tertiary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-search-results__empty { padding: 18px; text-align: center; color: var(--color-text-tertiary); font-size: var(--font-size-sm); }

.msg-convs { flex: 1; overflow-y: auto; padding: var(--spacing-sm); display: flex; flex-direction: column; gap: 2px; }
.msg-conv {
  display: flex; align-items: center; gap: 12px; width: 100%; padding: 10px 12px; cursor: pointer;
  border: none; border-radius: var(--radius-md); background: transparent; text-align: left;
  transition: background var(--transition-fast), transform var(--transition-fast);
  animation: msg-conv-in 0.4s var(--transition-smooth) both;
}
.msg-conv:hover { background: var(--color-surface-glass); }
.msg-conv.is-active { background: var(--color-surface-glass-hover); box-shadow: inset 3px 0 0 var(--color-accent-primary); }
.msg-conv__avatar {
  width: 46px; height: 46px; border-radius: 50%; flex: none; color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: var(--font-size-sm); font-weight: var(--font-weight-bold); box-shadow: var(--shadow-sm);
}
.msg-conv__avatar--official { background: linear-gradient(135deg, #0071e3, #34c759); }
.msg-conv__avatar--official svg { width: 22px; height: 22px; }
/* Uploaded photo avatars fill the circle (conversation list + chat header). */
.msg-conv__avatar.has-photo, .msg-chat__avatar.has-photo { overflow: hidden; }
.msg-avatar__img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: inherit; }
.msg-conv__main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.msg-conv__top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.msg-conv__name { font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; align-items: center; gap: 6px; }
.msg-conv__official { font-size: 10px; font-weight: var(--font-weight-bold); text-transform: uppercase; letter-spacing: 0.4px; color: #34c759; background: rgba(52,199,89,0.12); padding: 1px 6px; border-radius: var(--radius-full); }
.msg-conv__time { font-size: var(--font-size-xs); color: var(--color-text-tertiary); flex: none; }
.msg-conv__row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.msg-conv__preview { font-size: var(--font-size-sm); color: var(--color-text-tertiary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-conv__badge { flex: none; min-width: 20px; height: 20px; padding: 0 6px; border-radius: var(--radius-full); background: var(--color-accent-primary); color: #fff; font-size: 11px; font-weight: var(--font-weight-bold); display: inline-flex; align-items: center; justify-content: center; }
.msg-conv--official { border-bottom: 1px solid var(--glass-border); border-radius: var(--radius-md); margin-bottom: 4px; }

.msg-convs__empty { text-align: center; color: var(--color-text-tertiary); padding: 40px 20px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.msg-convs__empty svg { width: 40px; height: 40px; opacity: 0.5; }
.msg-convs__empty p { font-size: var(--font-size-sm); line-height: 1.5; }

.msg-notice {
  display: flex; gap: 10px; align-items: flex-start; margin: 8px; padding: 12px 14px;
  background: rgba(0,113,227,0.06); border: 1px solid rgba(0,113,227,0.16); border-radius: var(--radius-md);
  font-size: var(--font-size-xs); color: var(--color-text-secondary); line-height: 1.5;
}
.msg-notice svg { width: 18px; height: 18px; color: var(--color-accent-primary); }
.msg-notice code { background: rgba(0,0,0,0.06); padding: 1px 5px; border-radius: 4px; font-size: 11px; }

/* ============================================================
   Chat pane
   ============================================================ */
.msg-chat__empty {
  height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 40px; gap: 12px; color: var(--color-text-tertiary);
}
.msg-chat__empty-art {
  width: 96px; height: 96px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-surface-glass); border: 1px solid var(--glass-border); box-shadow: var(--shadow-glass);
  color: var(--color-accent-primary);
}
.msg-chat__empty-art svg { width: 44px; height: 44px; }
.msg-chat__empty-title { font-size: var(--font-size-xl); font-weight: var(--font-weight-bold); color: var(--color-text-primary); }
.msg-chat__empty-text { font-size: var(--font-size-sm); max-width: 340px; line-height: 1.6; }

.msg-chat__inner { display: flex; flex-direction: column; height: 100%; min-height: 0; flex: 1; }
/* An author `display` value overrides the [hidden] attribute's UA display:none,
   so restore it explicitly — otherwise the empty state and the chat both show. */
.msg-chat__empty[hidden], .msg-chat__inner[hidden] { display: none !important; }

.msg-chat__head {
  display: flex; align-items: center; gap: 12px; padding: 10px var(--spacing-md);
  border-bottom: 1px solid var(--glass-border); background: var(--color-surface); backdrop-filter: blur(20px);
  min-height: 64px; z-index: 2;
}
.msg-chat__back { display: none; border: none; background: transparent; cursor: pointer; color: var(--color-text-secondary); padding: 6px; border-radius: 50%; }
.msg-chat__back:hover { background: var(--color-surface-glass); }
.msg-chat__idlink { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; min-width: 0; flex: 1; border-radius: var(--radius-md); padding: 4px; transition: background var(--transition-fast); }
.msg-chat__idlink:hover { background: var(--color-surface-glass); }
.msg-chat__avatar { width: 42px; height: 42px; border-radius: 50%; flex: none; color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: var(--font-size-sm); font-weight: var(--font-weight-bold); box-shadow: var(--shadow-sm); }
.msg-chat__avatar--official { background: linear-gradient(135deg, #0071e3, #34c759); }
.msg-chat__avatar--official svg { width: 20px; height: 20px; }
.msg-chat__id { min-width: 0; display: flex; flex-direction: column; }
.msg-chat__name { font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); display: flex; align-items: center; gap: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-chat__sub { font-size: var(--font-size-xs); color: var(--color-text-tertiary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-chat__actions { display: flex; align-items: center; gap: 4px; flex: none; }
.msg-chat__act { width: 38px; height: 38px; border: none; background: transparent; border-radius: 50%; cursor: pointer; color: var(--color-text-secondary); display: inline-flex; align-items: center; justify-content: center; transition: background var(--transition-fast), color var(--transition-fast); }
.msg-chat__act:hover { background: var(--color-surface-glass); color: var(--color-text-primary); }
.msg-chat__act.is-on { color: var(--color-error); background: rgba(255,59,48,0.1); }
/* Official-channel "message language" switcher (StudyHub-Team auto-messages). */
.msg-chat__id--grow { flex: 1 1 auto; }
.msg-lang__wrap { display: inline-flex; align-items: center; gap: 6px; padding: 4px 6px 4px 10px; border: 1px solid var(--glass-border); border-radius: var(--radius-full); background: var(--color-surface-glass); color: var(--color-text-secondary); }
.msg-lang__ic { display: inline-flex; }
.msg-lang__ic svg { width: 15px; height: 15px; }
.msg-lang { border: none; background: transparent; color: var(--color-text-primary); font-family: inherit; font-size: 12px; font-weight: var(--font-weight-medium); cursor: pointer; max-width: 150px; padding: 2px 2px; -webkit-appearance: none; appearance: none; }
.msg-lang:focus { outline: none; }
.msg-lang option { color: #111; }

/* ── Thread ────────────────────────────────────────────────── */
.msg-chat__scroll { flex: 1; overflow-y: auto; padding: var(--spacing-lg) var(--spacing-md); display: flex; flex-direction: column; gap: 4px; scroll-behavior: smooth; width: 100%; max-width: 1000px; margin-inline: auto; }
.msg-chat__inner.is-drag .msg-chat__scroll { outline: 2px dashed var(--color-accent-primary); outline-offset: -10px; border-radius: var(--radius-lg); }

.msg-daysep { text-align: center; margin: 14px 0 8px; }
.msg-daysep span { font-size: 11px; font-weight: var(--font-weight-semibold); color: var(--color-text-tertiary); background: var(--color-surface-glass); border: 1px solid var(--glass-border); padding: 4px 12px; border-radius: var(--radius-full); }

.msg-row {
  display: flex; align-items: flex-end; gap: 8px; max-width: 76%;
  opacity: 0; transform: translateY(8px); transition: opacity 0.32s ease, transform 0.32s var(--transition-smooth);
}
.msg-row.is-in { opacity: 1; transform: none; }
.msg-row.is-mine { align-self: flex-end; flex-direction: row-reverse; }
.msg-row__avatar { width: 30px; height: 30px; border-radius: 50%; flex: none; display: inline-flex; align-items: center; justify-content: center; color: #fff; }
.msg-row__avatar--official { background: linear-gradient(135deg, #0071e3, #34c759); }
.msg-row__avatar--official svg { width: 16px; height: 16px; }

.msg-bubble {
  position: relative; padding: 9px 13px 20px; border-radius: 16px;
  background: #fff; border: 1px solid var(--glass-border); box-shadow: var(--shadow-sm);
  font-size: var(--font-size-sm); line-height: 1.5; color: var(--color-text-primary);
  word-break: break-word; max-width: 100%;
  /* Reserve enough width for the absolutely-positioned timestamp so short
     messages (e.g. "hi" / a single emoji) don't squeeze it into a wrap. */
  min-width: 72px;
}
.msg-row.is-mine .msg-bubble { background: var(--color-gradient); color: #fff; border-color: transparent; box-shadow: 0 4px 14px rgba(0,113,227,0.26); }
.msg-row:not(.is-mine) .msg-bubble { border-bottom-left-radius: 5px; }
.msg-row.is-mine .msg-bubble { border-bottom-right-radius: 5px; }
.msg-bubble__title { font-weight: var(--font-weight-bold); margin-bottom: 3px; }
.msg-bubble__text a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.msg-row:not(.is-mine) .msg-bubble__text a { color: var(--color-accent-primary); }
.msg-bubble__time { position: absolute; right: 12px; bottom: 5px; font-size: 10px; opacity: 0.62; white-space: nowrap; }
.msg-row.is-mine .msg-bubble__time { color: rgba(255,255,255,0.85); }
.msg-bubble__more { align-self: center; border: none; background: transparent; color: var(--color-text-tertiary); cursor: pointer; opacity: 0; padding: 4px; border-radius: 50%; transition: opacity var(--transition-fast), background var(--transition-fast); }
.msg-row:hover .msg-bubble__more { opacity: 1; }
.msg-bubble__more:hover { background: var(--color-surface-glass); color: var(--color-text-primary); }

/* Recalled (撤回) message — a centered, muted system line. */
.msg-row.is-recalled { align-self: center; max-width: 100%; justify-content: center; }
.msg-recalled { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-style: italic; color: var(--color-text-tertiary); background: var(--color-surface-glass); border: 1px solid var(--glass-border); padding: 4px 12px; border-radius: var(--radius-full); }
.msg-recalled svg { width: 13px; height: 13px; opacity: 0.75; }

.msg-bubble--official { background: var(--color-surface); border-color: rgba(0,113,227,0.18); }
.msg-bubble--official.is-important { border-color: rgba(255,149,0,0.4); box-shadow: 0 4px 16px rgba(255,149,0,0.16); }
.msg-bubble__flag { display: inline-block; font-size: 10px; font-weight: var(--font-weight-bold); text-transform: uppercase; letter-spacing: 0.4px; color: #ff9500; background: rgba(255,149,0,0.14); padding: 2px 7px; border-radius: var(--radius-full); margin-bottom: 5px; }

/* Attachments inside a bubble */
.msg-atts { display: flex; flex-direction: column; gap: 6px; margin-top: 6px; }
.msg-atts__imgs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; border-radius: 12px; overflow: hidden; max-width: 260px; }
.msg-atts__imgs.is-single { grid-template-columns: 1fr; }
.msg-att-img { border: none; padding: 0; cursor: pointer; background: rgba(0,0,0,0.05); aspect-ratio: 1; overflow: hidden; }
.msg-atts__imgs.is-single .msg-att-img { aspect-ratio: auto; max-height: 280px; }
.msg-att-img img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform var(--transition-base); }
.msg-att-img:hover img { transform: scale(1.04); }
.msg-att-file {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px; cursor: pointer; min-width: 210px; max-width: 280px;
  background: rgba(0,0,0,0.04); border: 1px solid var(--glass-border); border-radius: 12px; transition: background var(--transition-fast);
}
.msg-row.is-mine .msg-att-file { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.25); }
.msg-att-file:hover { background: rgba(0,0,0,0.07); }
.msg-att-file__ext { flex: none; width: 40px; height: 40px; border-radius: 9px; background: var(--ext, #8a8a8a); color: #fff; font-size: 11px; font-weight: var(--font-weight-bold); display: inline-flex; align-items: center; justify-content: center; }
.msg-att-file__meta { min-width: 0; flex: 1; display: flex; flex-direction: column; }
.msg-att-file__name { font-size: 12.5px; font-weight: var(--font-weight-medium); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-att-file__size { font-size: 11px; opacity: 0.7; }
.msg-att-file__dl { flex: none; color: inherit; opacity: 0.7; display: inline-flex; padding: 4px; border-radius: 8px; }
.msg-att-file__dl:hover { opacity: 1; background: rgba(0,0,0,0.08); }

.msg-thread__empty, .msg-thread__welcome { text-align: center; color: var(--color-text-tertiary); padding: 30px 20px; margin: auto; max-width: 420px; }
.msg-thread__empty span { display: inline-flex; width: 46px; height: 46px; align-items: center; justify-content: center; border-radius: 50%; background: var(--color-surface-glass); color: var(--color-accent-primary); margin-bottom: 10px; }
.msg-thread__empty p { font-size: var(--font-size-sm); }
.msg-thread__welcome { background: var(--color-surface); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow-glass); margin: 0 auto 12px; }
.msg-thread__welcome-badge { display: inline-flex; width: 52px; height: 52px; align-items: center; justify-content: center; border-radius: 50%; background: linear-gradient(135deg, #0071e3, #34c759); color: #fff; margin-bottom: 10px; }
.msg-thread__welcome-badge svg { width: 26px; height: 26px; }
.msg-thread__welcome-title { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); color: var(--color-text-primary); margin-bottom: 6px; }
.msg-thread__welcome-text { font-size: var(--font-size-sm); line-height: 1.6; }

/* ── Notice bar (block / muted / official) ─────────────────── */
.msg-chat__notice {
  display: flex; align-items: center; gap: 12px; padding: 10px var(--spacing-md);
  background: var(--color-bg-tertiary); border-top: 1px solid var(--glass-border);
  font-size: var(--font-size-sm); color: var(--color-text-secondary);
}
.msg-chat__notice[hidden] { display: none !important; }
.msg-notice__btn { margin-left: auto; border: 1px solid var(--glass-border); background: var(--color-surface); color: var(--color-accent-primary); font-weight: var(--font-weight-semibold); font-size: var(--font-size-xs); padding: 6px 12px; border-radius: var(--radius-full); cursor: pointer; transition: background var(--transition-fast); flex: none; }
.msg-notice__btn:hover { background: var(--color-surface-glass-hover); }

/* ── Composer ──────────────────────────────────────────────── */
.msg-composer { position: relative; border-top: 1px solid var(--glass-border); padding: 10px var(--spacing-md) 12px; background: var(--color-surface); backdrop-filter: blur(20px); }
.msg-composer.is-disabled { opacity: 0.85; }
.msg-composer__atts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.msg-composer__atts[hidden] { display: none; }
.msg-pend { display: flex; align-items: center; gap: 8px; background: var(--color-surface-glass); border: 1px solid var(--glass-border); border-radius: var(--radius-md); padding: 5px 8px 5px 5px; max-width: 220px; animation: msg-pop 0.2s var(--transition-smooth); }
.msg-pend__thumb { width: 34px; height: 34px; border-radius: 7px; overflow: hidden; flex: none; display: inline-flex; align-items: center; justify-content: center; background: var(--color-bg-tertiary); }
.msg-pend__thumb img { width: 100%; height: 100%; object-fit: cover; }
.msg-pend__ext { width: 100%; height: 100%; display: inline-flex; align-items: center; justify-content: center; background: var(--ext, #8a8a8a); color: #fff; font-size: 9px; font-weight: var(--font-weight-bold); }
.msg-pend__name { font-size: var(--font-size-xs); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-pend__x { flex: none; border: none; background: transparent; color: var(--color-text-tertiary); cursor: pointer; display: inline-flex; padding: 2px; border-radius: 50%; }
.msg-pend__x:hover { color: var(--color-error); background: rgba(255,59,48,0.1); }
.msg-pend__x svg { width: 14px; height: 14px; }

.msg-composer__row { display: flex; align-items: flex-end; gap: 10px; width: 100%; max-width: 1000px; margin-inline: auto; }
.msg-composer__atts { max-width: 1000px; margin-inline: auto; }
.msg-composer__icon, .msg-composer__send { flex: none; width: 44px; height: 44px; border-radius: 50%; border: none; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast); }
.msg-composer__icon svg, .msg-composer__send svg { width: 20px; height: 20px; }
.msg-composer__icon { background: var(--color-surface-glass); color: var(--color-text-secondary); }
.msg-composer__icon:hover:not(:disabled) { background: var(--color-surface-glass-hover); color: var(--color-text-primary); }
.msg-composer__icon:disabled { opacity: 0.4; cursor: not-allowed; }
#msgEmojiBtn[aria-expanded="true"] { background: rgba(0,113,227,0.12); color: var(--color-accent-primary); }

/* ── Emoji picker ──────────────────────────────────────────── */
.msg-emoji {
  position: absolute;
  bottom: calc(100% - 2px);
  left: var(--spacing-md);
  width: min(340px, calc(100vw - 32px));
  background: var(--color-surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--color-border, var(--glass-border));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 30;
  overflow: hidden;
  animation: msg-pop 0.16s var(--transition-smooth);
}
.msg-emoji[hidden] { display: none; }
.msg-emoji__tabs { display: flex; gap: 2px; padding: 8px 8px 0; border-bottom: 1px solid var(--glass-border); }
.msg-emoji__tab {
  flex: 1; border: none; background: transparent; cursor: pointer; font-size: 18px; line-height: 1;
  padding: 6px 0 8px; border-bottom: 2px solid transparent; border-radius: 8px 8px 0 0;
  transition: background var(--transition-fast);
}
.msg-emoji__tab:hover { background: var(--color-surface-glass-hover); }
.msg-emoji__tab.is-active { border-bottom-color: var(--color-accent-primary); }
.msg-emoji__grid {
  display: grid; grid-template-columns: repeat(8, 1fr); gap: 2px;
  padding: 8px; max-height: 208px; overflow-y: auto;
}
.msg-emoji__item {
  border: none; background: transparent; cursor: pointer; font-size: 20px; line-height: 1;
  padding: 6px 0; border-radius: 8px; transition: background var(--transition-fast), transform var(--transition-fast);
}
.msg-emoji__item:hover { background: var(--color-surface-glass-hover); transform: scale(1.15); }
.msg-composer__input {
  flex: 1; min-height: 44px; max-height: 140px; padding: 11px 16px; resize: none;
  border: 1px solid var(--glass-border); border-radius: 22px; background: var(--color-surface-glass);
  font-family: inherit; font-size: var(--font-size-sm); line-height: 1.4; color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.msg-composer__input:focus { outline: none; border-color: var(--color-accent-primary); box-shadow: 0 0 0 3px rgba(0,113,227,0.12); background: #fff; }
.msg-composer__input:disabled { cursor: not-allowed; }
.msg-composer__send { background: var(--color-gradient); color: #fff; box-shadow: 0 4px 14px rgba(0,113,227,0.28); }
.msg-composer__send:hover:not(:disabled) { transform: translateY(-1px) scale(1.03); box-shadow: 0 8px 20px rgba(0,113,227,0.34); }
.msg-composer__send:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.msg-composer__send.is-loading { pointer-events: none; }
.msg-composer__send.is-loading svg { animation: msg-spin 0.7s linear infinite; }

/* ============================================================
   Report modal
   ============================================================ */
.msg-modal { position: fixed; inset: 0; z-index: 2400; display: flex; align-items: center; justify-content: center; padding: 20px; background: rgba(0,0,0,0.4); backdrop-filter: blur(6px); opacity: 0; visibility: hidden; transition: opacity var(--transition-base), visibility var(--transition-base); }
.msg-modal.is-open { opacity: 1; visibility: visible; }
.msg-modal__card { width: min(460px, 100%); background: var(--color-bg-primary); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: var(--spacing-lg); box-shadow: var(--shadow-xl); transform: translateY(14px) scale(0.98); transition: transform var(--transition-smooth); max-height: 90vh; overflow-y: auto; }
.msg-modal.is-open .msg-modal__card { transform: none; }
.msg-modal__head { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.msg-modal__title { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); }
.msg-modal__sub { font-size: var(--font-size-xs); color: var(--color-text-tertiary); margin-top: 3px; }
.msg-modal__close { border: none; background: var(--color-surface-glass); width: 34px; height: 34px; border-radius: 50%; cursor: pointer; color: var(--color-text-secondary); flex: none; display: inline-flex; align-items: center; justify-content: center; }
.msg-modal__quote { font-size: var(--font-size-sm); color: var(--color-text-secondary); background: var(--color-surface-glass); border-left: 3px solid var(--color-text-tertiary); padding: 8px 12px; border-radius: var(--radius-sm); margin-bottom: 12px; }
.msg-radio { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--glass-border); border-radius: var(--radius-md); cursor: pointer; margin-bottom: 6px; font-size: var(--font-size-sm); transition: border-color var(--transition-fast), background var(--transition-fast); }
.msg-radio:hover { background: var(--color-surface-glass); }
.msg-radio.is-active { border-color: var(--color-accent-primary); background: rgba(0,113,227,0.06); }
.msg-radio__mark { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--color-text-tertiary); flex: none; position: relative; }
.msg-radio.is-active .msg-radio__mark { border-color: var(--color-accent-primary); }
.msg-radio.is-active .msg-radio__mark::after { content: ''; position: absolute; inset: 3px; border-radius: 50%; background: var(--color-accent-primary); }
.msg-modal__textarea { width: 100%; min-height: 80px; margin-top: 10px; padding: 10px 12px; border: 1px solid var(--glass-border); border-radius: var(--radius-md); font-family: inherit; font-size: var(--font-size-sm); resize: vertical; background: var(--color-surface-glass); color: var(--color-text-primary); }
.msg-modal__textarea:focus { outline: none; border-color: var(--color-accent-primary); }
.msg-modal__note { min-height: 16px; margin-top: 6px; font-size: var(--font-size-xs); color: var(--color-error); }
.msg-modal__note:empty { display: none; }
.msg-modal__actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }

.msg-btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: var(--radius-full); border: 1px solid transparent; font-family: inherit; font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); cursor: pointer; text-decoration: none; transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast); }
.msg-btn--primary { background: var(--color-gradient); color: #fff; box-shadow: 0 6px 16px rgba(0,113,227,0.26); }
.msg-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,113,227,0.34); }
.msg-btn--ghost { background: transparent; border-color: var(--glass-border); color: var(--color-text-secondary); }
.msg-btn--ghost:hover { background: var(--color-surface-glass); color: var(--color-text-primary); }
.msg-btn--danger { background: var(--color-error); color: #fff; }
.msg-btn--danger:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============================================================
   Preview lightbox
   ============================================================ */
.msg-preview { position: fixed; inset: 0; z-index: 2600; display: flex; align-items: center; justify-content: center; padding: 40px; opacity: 0; visibility: hidden; transition: opacity var(--transition-base), visibility var(--transition-base); }
.msg-preview.is-open { opacity: 1; visibility: visible; }
.msg-preview__backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.72); backdrop-filter: blur(6px); }
.msg-preview__panel { position: relative; z-index: 1; width: min(960px, 100%); height: min(84vh, 900px); background: var(--color-bg-primary); border-radius: var(--radius-lg); border: 1px solid var(--glass-border); display: flex; flex-direction: column; overflow: hidden; box-shadow: var(--shadow-xl); transform: scale(0.96); transition: transform var(--transition-smooth); }
.msg-preview.is-open .msg-preview__panel { transform: scale(1); }
.msg-preview__bar { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--glass-border); }
.msg-preview__title { flex: 1; min-width: 0; font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-preview__actions { display: flex; gap: 8px; }
.msg-preview__btn { width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--glass-border); background: var(--color-surface-glass); color: var(--color-text-secondary); cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.msg-preview__btn:hover { color: var(--color-text-primary); border-color: var(--color-accent-primary); }
.msg-preview__body { flex: 1; overflow: auto; display: flex; align-items: center; justify-content: center; background: var(--color-bg-secondary); }
.msg-preview__img { max-width: 100%; max-height: 100%; object-fit: contain; }
.msg-preview__frame { width: 100%; height: 100%; border: 0; background: #fff; }
.msg-preview__text { width: 100%; height: 100%; margin: 0; padding: 20px; overflow: auto; text-align: left; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 13px; line-height: 1.6; white-space: pre-wrap; word-break: break-word; align-self: stretch; }
.msg-preview__loading { display: flex; align-items: center; justify-content: center; }
.msg-preview__fallback { text-align: center; padding: 40px; display: flex; flex-direction: column; align-items: center; gap: 14px; }
.msg-preview__fbname { font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); }
.msg-preview__fbmsg { font-size: var(--font-size-sm); color: var(--color-text-tertiary); }
.msg-preview__fbactions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.msg-preview__fallback .msg-att-file__ext { border-radius: 14px; }

.msg-spinner, .msg-preview__loading .msg-spinner { width: 34px; height: 34px; border-radius: 50%; border: 3px solid var(--glass-border); border-top-color: var(--color-accent-primary); animation: msg-spin 0.7s linear infinite; }

/* ── Skeletons ─────────────────────────────────────────────── */
.msg-conv-skel { height: 62px; border-radius: var(--radius-md); margin: 2px 4px; background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 37%, var(--color-bg-tertiary) 63%); background-size: 400% 100%; animation: msg-shimmer 1.4s ease infinite; }
.msg-skel { height: 40px; width: 55%; border-radius: 16px; background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 37%, var(--color-bg-tertiary) 63%); background-size: 400% 100%; animation: msg-shimmer 1.4s ease infinite; margin: 6px 0; }
.msg-skel--r { align-self: flex-end; width: 45%; margin-left: auto; }

/* ── Keyframes ─────────────────────────────────────────────── */
@keyframes msg-conv-in { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: none; } }
@keyframes msg-pop { from { opacity: 0; transform: translateY(6px) scale(0.97); } to { opacity: 1; transform: none; } }
@keyframes msg-spin { to { transform: rotate(360deg); } }
@keyframes msg-shimmer { from { background-position: 100% 0; } to { background-position: -100% 0; } }

/* ============================================================
   Responsive — single pane with slide-over chat on mobile
   ============================================================ */
@media (max-width: 767px) {
  .msg-shell { position: relative; }
  .msg-pane--list { width: 100%; border-right: none; }
  .msg-pane--chat {
    position: absolute; inset: 0; z-index: 5;
    transform: translateX(100%); transition: transform var(--transition-smooth);
    background: var(--color-bg-secondary);
  }
  .msg-shell.is-chat-open .msg-pane--chat { transform: none; }
  .msg-chat__back { display: inline-flex; }
  .msg-row { max-width: 86%; }
  .msg-preview { padding: 0; }
  .msg-preview__panel { width: 100%; height: 100%; border-radius: 0; border: 0; }
}
@media (max-width: 420px) {
  .msg-list__head { padding: 12px 12px 8px; }
  .msg-convs { padding: 6px; }
  .msg-chat__scroll { padding: 14px 10px; }
}

/* ============================================================
   Multi-select report + right-click context menu
   ============================================================ */
/* Select mode: a checkbox before the other person's messages */
.msg-select {
  flex: none; width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid var(--color-text-tertiary);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; background: transparent; align-self: center;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.msg-select svg { width: 13px; height: 13px; }
.msg-row.is-selectable { cursor: pointer; }
.msg-row.is-selectable .msg-bubble { transition: box-shadow var(--transition-fast), transform var(--transition-fast); }
.msg-row.is-selectable:hover .msg-bubble { box-shadow: 0 0 0 2px var(--color-accent-primary); }
.msg-row.is-selected .msg-select { background: var(--color-accent-primary); border-color: var(--color-accent-primary); }
.msg-row.is-selected .msg-bubble { box-shadow: 0 0 0 2px var(--color-accent-primary); }

/* Floating action bar while selecting */
.msg-selectbar {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%);
  z-index: 1200; display: flex; align-items: center; gap: 16px;
  padding: 10px 12px 10px 18px; border-radius: var(--radius-full);
  background: var(--color-surface-elevated, #fff);
  border: 1px solid var(--glass-border); box-shadow: 0 12px 34px rgba(0,0,0,0.22);
  max-width: calc(100vw - 32px);
}
.msg-selectbar[hidden] { display: none; }
.msg-selectbar__count { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.msg-selectbar__actions { display: flex; gap: 8px; }
.msg-selectbar .msg-btn { padding: 8px 16px; }

/* Right-click context menu (recall / copy) */
.msg-ctxmenu {
  position: fixed; z-index: 1300; min-width: 148px;
  padding: 6px; border-radius: var(--radius-md);
  background: var(--color-surface-elevated, #fff);
  border: 1px solid var(--glass-border); box-shadow: 0 12px 34px rgba(0,0,0,0.24);
}
.msg-ctxmenu[hidden] { display: none; }
.msg-ctxmenu__item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 9px 12px; border: none; background: transparent; cursor: pointer;
  font-family: inherit; font-size: var(--font-size-sm); color: var(--color-text-primary);
  border-radius: var(--radius-sm); text-align: left;
}
.msg-ctxmenu__item:hover { background: var(--color-surface-glass); }
.msg-ctxmenu__item svg { width: 16px; height: 16px; flex: none; color: var(--color-text-secondary); }

@media (prefers-reduced-motion: reduce) {
  .msg-row, .msg-conv, .msg-pane--chat, .msg-preview__panel, .msg-modal__card { transition: none !important; animation: none !important; }
  .msg-row { opacity: 1; transform: none; }
}