/* ===== APP SHELL ===== */
.app {
  display: grid;
  grid-template-columns: var(--rail-w) var(--list-w) 1fr;
  grid-template-rows: minmax(0, 1fr);
  height: 100%; background: var(--bg); overflow: hidden;
}
.rail, .convlist, .chat-col { min-height: 0; height: 100%; overflow: hidden; }
.chat-col { display: flex; flex-direction: column; }

/* ---- SPACES RAIL ---- */
.rail {
  display: flex; flex-direction: column; align-items: center;
  background: var(--bg-tint); border-right: 1px solid var(--border);
  padding: 12px 0 10px; gap: 6px;
}
.rail-logo { padding: 4px; border-radius: 12px; transition: transform .12s; }
.rail-logo:hover { transform: scale(1.05); }
.rail-div { width: 28px; height: 1px; background: var(--border-2); margin: 2px 0; }
.rail-spaces { display: flex; flex-direction: column; align-items: center; gap: 8px; flex: 1; width: 100%; padding: 2px 0; }
.rail-spaces::-webkit-scrollbar { display: none; }
.rail-item { position: relative; display: flex; align-items: center; justify-content: center; }
.rail-pip {
  position: absolute; left: -12px; top: 50%; transform: translateY(-50%) scaleY(0);
  width: 4px; height: 26px; border-radius: 0 4px 4px 0; background: var(--primary);
  transition: transform .18s cubic-bezier(.3,1.2,.5,1);
}
.rail-item.on .rail-pip { transform: translateY(-50%) scaleY(1); }
.rail-sq {
  width: 46px; height: 46px; border-radius: 15px; transition: border-radius .18s, transform .12s;
}
.rail-item:hover .rail-sq { border-radius: 13px; }
.rail-item.on .rail-sq { border-radius: 14px; box-shadow: 0 0 0 2px var(--bg-tint), 0 0 0 4px var(--primary); }
.rail-add { background: transparent; color: var(--text-3); box-shadow: inset 0 0 0 1.5px var(--border-2); }
.rail-add:hover { color: var(--primary); box-shadow: inset 0 0 0 1.5px var(--primary); }
.rail-badge {
  position: absolute; top: -3px; right: -3px; min-width: 18px; height: 18px; padding: 0 5px;
  border-radius: 99px; background: var(--danger); color: #fff; font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; box-shadow: 0 0 0 2px var(--bg-tint);
}
.rail-bottom { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.rail-mini { width: 40px; height: 40px; border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--text-2); transition: background .14s, color .14s; }
.rail-mini:hover { background: var(--surface-2); color: var(--text); }
.rail-avatar { border-radius: 50%; transition: transform .12s; margin-top: 2px; }
.rail-avatar:hover { transform: scale(1.06); }

/* ---- CONVERSATION LIST ---- */
.convlist { display: flex; flex-direction: column; border-right: 1px solid var(--border); background: var(--bg-tint); min-width: 0; } /* nav plane = rail+list; chat = lighter --bg */
.convlist-head { padding: 14px 14px 10px; border-bottom: 1px solid var(--border); display: flex; flex-direction: column; gap: 12px; }
.cl-title { font-size: 20px; font-weight: 800; letter-spacing: -0.025em; margin: 0; }
.cl-search { position: relative; }
.cl-filters { display: flex; gap: 7px; overflow-x: auto; margin: -2px; padding: 2px 14px 2px 2px; scroll-padding-right: 14px; -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 12px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 12px), transparent); }
.cl-filters::-webkit-scrollbar { display: none; }
.cl-filters .chip { height: 30px; flex-shrink: 0; }
@media (pointer: coarse) { .cl-filters .chip { height: 44px; } }

.convlist-body { flex: 1; padding: 6px 8px 16px; }
.cl-sec { font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--text-3); padding: 12px 10px 5px; }
.cl-menu { position: absolute; top: 42px; right: 0; min-width: 230px; }

.conv-row {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  padding: var(--row-pad) 10px; border-radius: var(--r-md); transition: background .12s; position: relative;
}
.conv-row:hover { background: var(--surface-2); }
.conv-row.active { background: var(--primary-soft); }
.conv-row.active .conv-name { color: var(--text-on-soft); }
.conv-name { font-weight: 700; font-size: 14.5px; letter-spacing: -0.01em; color: var(--text); }
.conv-time { font-size: 11.5px; color: var(--text-3); flex-shrink: 0; }
.conv-prev { font-size: 13.5px; color: var(--text-2); align-items: center; }
.conv-row.active .conv-prev { color: var(--text-on-soft); opacity: .85; }
.conv-typing { color: var(--primary-strong); font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
[data-theme="dark"] .conv-typing { color: var(--primary-bright); }
.td { display: inline-flex; gap: 3px; }
.td i { width: 5px; height: 5px; border-radius: 99px; background: currentColor; animation: typingB 1.2s infinite; }
.td i:nth-child(2) { animation-delay: .2s; } .td i:nth-child(3) { animation-delay: .4s; }
@keyframes typingB { 0%,60%,100% { opacity: .3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }

.cl-empty { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 60px 20px; }
.cl-empty-ic { width: 64px; height: 64px; border-radius: 20px; background: var(--surface-2); color: var(--text-3); margin-bottom: 4px; }

/* ---- MAIN PLACEHOLDER ---- */
.chat-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; gap: 16px; background:
    radial-gradient(60% 50% at 50% 40%, var(--bg-tint), var(--bg));
  position: relative; overflow: hidden;
}
.chat-empty-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px; text-align: center;
  z-index: 1; padding: 30px;
}
.chat-empty-ic { width: 88px; height: 88px; border-radius: 28px; background: var(--surface); box-shadow: var(--shadow-md); color: var(--primary); }

/* ---- RESPONSIVE ---- */
@media (max-width: 1080px) { :root { --list-w: 320px; } }
@media (max-width: 700px) {
  .app { grid-template-columns: var(--rail-w) 1fr; }
  .app.show-chat .convlist { display: none; }
  .app:not(.show-chat) .chat-col { display: none; }
}
@media (max-width: 560px) {
  /* L1: hide the rail on phone; its actions move to the list-header menu */
  .rail { display: none; }
  .app { grid-template-columns: 1fr; }
}