/* App shell: sidebar + main thread + composer */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100vh;
  height: 100dvh;
}

/* ---------- sidebar ---------- */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  border-top: 3px solid var(--red);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.side-top {
  padding: 16px 14px 12px;
  background: linear-gradient(180deg, rgba(222, 41, 16, 0.14), transparent 85%);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.14em;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 14px;
}
.brand .logo-star {
  width: 26px;
  height: 26px;
  filter: drop-shadow(0 0 7px rgba(222, 41, 16, 0.75));
}
#new-chat-btn { width: 100%; }

.chat-list-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 12px 18px 6px;
}
.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 8px;
  min-height: 0;
}
.chat-item {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 6px;
  padding: 8px 10px;
  color: var(--text);
  border-radius: 6px;
  text-align: left;
}
.chat-item:hover { background: var(--hover); }
.chat-item.active { background: var(--raised); box-shadow: inset 3px 0 0 var(--red); }
.chat-item .chat-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 14px;
}
.chat-item .chat-act {
  display: none;
  color: var(--dim);
  font-size: 13px;
  padding: 2px 4px;
  flex: none;
}
.chat-item:hover .chat-act { display: inline-block; }
.chat-item .chat-act:hover { color: var(--red-hi); }
.no-chats { color: var(--dim); font-size: 13px; padding: 8px 12px; font-style: italic; }

.side-bottom { border-top: 1px solid var(--border); padding: 8px; position: relative; }
.user-block {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--text);
}
.user-block:hover { background: var(--hover); }
.avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-family: var(--font-display);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex: none;
}
.user-name {
  flex: 1;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 14px;
}
.user-chev { color: var(--dim); }

.user-menu {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: calc(100% + 4px);
  background: var(--raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 30;
}
.menu-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 6px;
}
.lang-row { display: flex; gap: 6px; margin-bottom: 10px; }
.lang-btn {
  flex: 1;
  border: 1px solid var(--border);
  padding: 6px 0;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.08em;
  border-radius: 4px;
  color: var(--text);
}
.lang-btn:hover { border-color: var(--dim); }
.lang-btn.active { border-color: var(--red); color: var(--red-hi); }
.menu-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 4px;
  color: var(--text);
  font-size: 14px;
}
.menu-item:hover { background: var(--hover); color: var(--red-hi); }

/* ---------- main ---------- */
.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
.mobile-bar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-top: 3px solid var(--red);
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.mobile-bar .mobile-title {
  font-family: var(--font-display);
  letter-spacing: 0.14em;
  font-size: 18px;
}
#menu-btn { font-size: 20px; color: var(--text); padding: 2px 8px; }

.thread-wrap {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.thread {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px;
  gap: 14px;
  background: radial-gradient(ellipse at 50% 38%, rgba(222, 41, 16, 0.12), transparent 55%);
}
.empty-state .five-stars {
  width: 132px;
  height: 88px;
  filter: drop-shadow(0 0 16px rgba(222, 41, 16, 0.5));
}
.empty-state h1 { font-size: 30px; font-weight: 500; }
.empty-state .hint { color: var(--dim); max-width: 420px; }
.empty-slogan {
  margin-top: 10px;
  color: rgba(255, 222, 0, 0.30);
  font-size: 14px;
  letter-spacing: 0.55em;
  text-indent: 0.55em;
  user-select: none;
}

/* messages */
.msg { display: flex; flex-direction: column; gap: 4px; }
.msg-tag {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}
.msg-user { align-items: flex-end; }
.msg-user .msg-inner {
  background: rgba(222, 41, 16, 0.15);
  border: 1px solid rgba(222, 41, 16, 0.4);
  border-radius: 10px 10px 2px 10px;
  padding: 10px 14px;
  max-width: 85%;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.msg-assistant .msg-tag { color: var(--gold-soft); }
.msg-assistant .msg-inner {
  border-left: 2px solid var(--gold-soft);
  padding: 2px 0 2px 14px;
  max-width: 100%;
  overflow-wrap: break-word;
}
.msg-error .msg-inner {
  border-left-color: var(--red);
  color: #f0a9a0;
  font-style: italic;
}

.msg-inner p { margin: 0.4em 0; }
.msg-inner h1, .msg-inner h2, .msg-inner h3 { margin: 0.7em 0 0.35em; color: var(--gold-soft); }
.msg-inner h1 { font-size: 1.25em; }
.msg-inner h2 { font-size: 1.15em; }
.msg-inner h3 { font-size: 1.05em; }
.msg-inner ul, .msg-inner ol { margin: 0.4em 0 0.4em 1.4em; }
.msg-inner blockquote {
  border-left: 3px solid var(--red);
  margin: 0.5em 0;
  padding: 0.2em 0.9em;
  color: var(--dim);
}
.msg-inner code {
  background: var(--raised);
  border: 1px solid var(--border);
  padding: 0.08em 0.35em;
  border-radius: 3px;
  font-size: 0.9em;
}
.msg-inner pre {
  background: #0e0e0d;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 0.6em 0;
}
.msg-inner pre code { background: none; border: none; padding: 0; font-size: 0.88em; }
.msg-inner hr { border: none; border-top: 1px solid var(--border); margin: 0.8em 0; }
.msg-inner img.gen {
  display: block;
  max-width: min(480px, 100%);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
}
.img-expired { color: var(--dim); font-style: italic; font-size: 0.9em; }

.cursor-blink::after {
  content: '▌';
  color: var(--red-hi);
  animation: blink 0.9s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- composer ---------- */
.composer { padding: 8px 20px 18px; }
.composer-box {
  max-width: 820px;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px 8px;
  transition: border-color 0.15s;
}
.composer-box:focus-within { border-color: var(--red); }
#input {
  width: 100%;
  background: none;
  border: none;
  resize: none;
  max-height: 200px;
  line-height: 1.45;
  padding: 4px 2px 6px;
}
#input:focus { outline: none; }
.composer-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--border);
  padding-top: 8px;
}
#model-select {
  background: var(--raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  padding: 6px 8px;
  max-width: 260px;
}
.composer-spacer { flex: 1; }
#send-btn { border-radius: 6px; padding: 0.45em 1.2em; }

.scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 19;
}

/* ---------- mobile ---------- */
@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(300px, 84vw);
    z-index: 20;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .scrim.show { display: block; }
  .mobile-bar { display: flex; }
  .thread { padding: 16px 14px 8px; }
  .composer { padding: 6px 10px 12px; }
  #model-select { max-width: 170px; }
}