:root {
  --bg: #eef1f6;
  --panel: #ffffff;
  --border: #dbe1ea;
  --text: #1f2733;
  --muted: #7b8794;
  --accent: #3b6ef0;
  --ai: #ffffff;
  --player: #d6e4ff;
  --error: #d64545;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--error); min-height: 1.1em; margin: 6px 0 0; font-size: 14px; }

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  padding: 9px 16px;
}
button:disabled { opacity: .5; cursor: default; }
input[type="text"], input[type="password"] {
  font: inherit;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
}
input[type="text"]:focus, input[type="password"]:focus { border-color: var(--accent); }

/* --- Логин --- */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  width: min(360px, calc(100vw - 32px));
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 10px 30px rgba(31, 39, 51, .08);
}
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card .muted { margin: 0; }
.login-card button { margin-top: 4px; }

/* --- Каркас --- */
.app { display: flex; height: 100vh; }

.backdrop { display: none; }

.sidebar {
  width: 264px;
  flex: none;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.icon-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 20px;
  line-height: 1;
  border-radius: 50%;
}
.session-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  overflow-y: auto;
  flex: 1;
}
.session-list .empty { color: var(--muted); padding: 12px; font-size: 14px; }
.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
}
.session-item:hover { background: var(--bg); }
.session-item.active { background: var(--player); }
.session-item .s-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-item .s-count {
  font-size: 12px;
  color: var(--muted);
  background: var(--bg);
  border-radius: 10px;
  padding: 1px 8px;
}
.session-item .s-del {
  background: transparent;
  color: var(--muted);
  padding: 0 4px;
  font-size: 18px;
  line-height: 1;
  visibility: hidden;
}
.session-item:hover .s-del { visibility: visible; }
.session-item .s-del:hover { color: var(--error); }
.sidebar-foot { padding: 12px 16px; border-top: 1px solid var(--border); }
.link-btn { background: transparent; color: var(--muted); padding: 4px; }
.link-btn:hover { color: var(--accent); }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.menu-btn { display: none; flex: none; background: var(--bg); color: var(--text); font-size: 18px; }
.menu-btn:hover { background: var(--player); }
.chat-title { min-width: 0; flex: 1; }
.chat-source { font-size: 18px; font-weight: 600; letter-spacing: .5px; }
.chat-sub { font-size: 13px; color: var(--muted); }
.remaining {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  background: var(--player);
  border-radius: 20px;
  padding: 6px 14px;
  white-space: nowrap;
}
.remaining.done { color: var(--muted); background: var(--bg); }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.placeholder { margin: auto; color: var(--muted); }
.msg { display: flex; }
.msg.ai { justify-content: flex-start; }
.msg.player { justify-content: flex-end; }
.bubble {
  max-width: 70%;
  padding: 9px 14px;
  border-radius: 14px;
  background: var(--ai);
  border: 1px solid var(--border);
  word-break: break-word;
}
.msg.player .bubble { background: var(--player); border-color: transparent; }

.new-game {
  border-top: 1px solid var(--border);
  background: var(--panel);
  padding: 16px 20px;
}
.new-game-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.new-game-row input[type="range"] { flex: 1; min-width: 140px; accent-color: var(--accent); }
.suggest-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.chip {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 16px;
}
.chip:hover { background: var(--player); border-color: transparent; }

.move-form {
  display: flex;
  gap: 10px;
  padding: 14px 20px 4px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}
.move-form input { flex: 1; }
#message-error { background: var(--panel); padding: 0 20px 14px; margin: 0; }

@media (max-width: 720px) {
  .menu-btn { display: inline-flex; align-items: center; justify-content: center; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 20;
    width: min(300px, 82vw);
    transform: translateX(-100%);
    transition: transform .25s ease;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 0 12px 40px rgba(20, 26, 36, .28);
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 15;
    background: rgba(20, 26, 36, .45);
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s ease, visibility .25s ease;
  }
  .backdrop.open { opacity: 1; visibility: visible; }

  .chat-head { padding: 12px 14px; }
  .chat-source { font-size: 16px; }
  .remaining { padding: 5px 11px; font-size: 13px; }

  .messages { padding: 14px; }
  .bubble { max-width: 85%; }

  .new-game { padding: 14px; }
  .move-form { padding: 12px 14px 4px; }
  #message-error { padding: 0 14px 12px; }
}