:root {
  --bg: #16161a;
  --bg-panel: #1e1e23;
  --bg-panel-2: #232329;
  --gray-msg: #2c2c33;
  --gray-msg-user: #34343c;
  --text: #f2f2f2;
  --text-dim: #a0a0aa;
  --yellow: #f5c518;
  --border: #2c2c34;
  --accent: #f5c518;
  --danger: #e5484d;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  overscroll-behavior: none;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

a { color: var(--yellow); }

button {
  cursor: pointer;
  font-family: inherit;
}

/* --- Avatar (первая и третья буква названия на жёлтом фоне) --- */
.avatar {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 50%;
  background: var(--yellow);
  color: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.5px;
  user-select: none;
}

/* --- Auth pages (login/register) --- */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  width: 100%;
  max-width: 380px;
}

.auth-card h1 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  margin-top: 0;
}

.auth-card input {
  width: 100%;
  padding: 11px 12px;
  margin-bottom: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  color: var(--text);
  font-size: 14px;
}

.auth-card input:focus { outline: 1px solid var(--yellow); }

.auth-card button.primary {
  width: 100%;
  padding: 11px;
  border-radius: 8px;
  border: none;
  background: var(--yellow);
  color: #1a1a1a;
  font-weight: 600;
  font-size: 14px;
  margin-top: 4px;
}

.auth-switch {
  margin-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
}

.auth-error {
  background: rgba(229, 72, 77, 0.15);
  color: #ff8a8d;
  border: 1px solid rgba(229, 72, 77, 0.4);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 12px;
  display: none;
}

/* --- Chat layout --- */
.app {
  display: flex;
  height: 100%;
}

.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top, 0px);
}

.sidebar-header {
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header .app-name { font-weight: 700; font-size: 15px; flex: 1; }

.sidebar-close { display: none; background: none; border: none; color: var(--text-dim); font-size: 18px; }

.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 16px;
  margin-right: 10px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 15;
}

.new-chat-btn {
  margin: 12px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  color: var(--text);
  font-size: 14px;
  text-align: left;
}
.new-chat-btn:hover { border-color: var(--yellow); }

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px;
}

.history-item {
  padding: 10px 10px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 4px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}
.history-item:hover { background: var(--bg-panel-2); color: var(--text); }
.history-item.active { background: var(--gray-msg); color: var(--text); }
.history-item .del-btn {
  opacity: 0;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 13px;
}
.history-item:hover .del-btn { opacity: 1; }
.history-item .del-btn:hover { color: var(--danger); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px;
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sidebar-footer a, .sidebar-footer button.link {
  background: none;
  border: none;
  color: var(--text-dim);
  text-align: left;
  padding: 0;
  font-size: 13px;
}
.sidebar-footer button.link:hover { color: var(--yellow); }

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

.topbar {
  padding: 12px 20px;
  padding-top: calc(12px + env(safe-area-inset-top, 0px));
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.model-select {
  background: var(--bg-panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.msg-row {
  display: flex;
  gap: 10px;
  max-width: 780px;
  align-self: flex-start;
  width: 100%;
}
.msg-row.user { align-self: flex-end; flex-direction: row-reverse; }

.msg-bubble {
  background: var(--gray-msg);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 14.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  position: relative;
}
.msg-row.user .msg-bubble { background: var(--gray-msg-user); }

.msg-copy {
  margin-top: 6px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 12px;
  padding: 0;
}
.msg-copy:hover { color: var(--yellow); }

.composer {
  padding: 16px 20px 20px;
  padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
}

.composer textarea {
  flex: 1;
  resize: none;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  color: var(--text);
  padding: 12px;
  font-size: 14px;
  font-family: inherit;
  min-height: 46px;
  max-height: 160px;
}
.composer textarea:focus { outline: 1px solid var(--yellow); }

.send-btn {
  background: var(--yellow);
  color: #1a1a1a;
  border: none;
  border-radius: 10px;
  padding: 0 20px;
  font-weight: 600;
  font-size: 14px;
}
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 14px;
  flex-direction: column;
  gap: 10px;
}

/* --- Admin --- */
.admin-wrap { padding: 24px; max-width: 900px; margin: 0 auto; }
.admin-stats { display: flex; gap: 14px; margin: 18px 0; }
.stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  flex: 1;
}
.stat-card .num { font-size: 22px; font-weight: 700; color: var(--yellow); }
.stat-card .label { font-size: 12px; color: var(--text-dim); }

table { width: 100%; border-collapse: collapse; margin-top: 10px; }
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
}
th { color: var(--text-dim); font-weight: 600; }

/* --- Мобильная адаптация (Android/iPhone) --- */
@media (max-width: 768px) {
  .hamburger { display: inline-block; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 20;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 2px 0 16px rgba(0,0,0,0.4);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-close { display: block; }

  .sidebar-overlay.open { display: block; }

  .msg-row { max-width: 100%; }

  .admin-wrap { padding: 16px; }
  .admin-stats { flex-direction: column; }
}