*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --accent: #6c8fff;
  --accent2: #a78bfa;
  --text: #e2e8f0;
  --text-dim: #8892a4;
  --bubble-user: #2d4a8a;
  --bubble-nix: #1e2235;
  --border: #2a2f45;
  --radius: 18px;
}

html, body { height: 100%; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; font-size: 15px; }

.screen { height: 100%; display: flex; flex-direction: column; }
.hidden { display: none !important; }

/* ── Login ─────────────────────────────────────────── */
#login-screen { align-items: center; justify-content: center; }

.login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  width: 320px;
  display: flex; flex-direction: column; gap: 14px;
  text-align: center;
}

.logo { font-size: 28px; font-weight: 700; letter-spacing: -0.5px; }
.login-sub { color: var(--text-dim); font-size: 13px; }

.login-box input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  text-align: center;
  letter-spacing: 3px;
}
.login-box input:focus { border-color: var(--accent); }

.login-box button {
  background: var(--accent);
  border: none; border-radius: 10px;
  color: #fff; font-size: 15px; font-weight: 600;
  padding: 12px; cursor: pointer; transition: opacity .15s;
}
.login-box button:hover { opacity: .88; }
.error { color: #f87171; font-size: 13px; min-height: 18px; }

/* ── Chat ──────────────────────────────────────────── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between;
  flex-shrink: 0;
}

.header-left  { display: flex; align-items: center; gap: 10px; }
.header-right { display: flex; align-items: center; gap: 10px; }

#docs-btn {
  background: transparent; border: 1px solid var(--border);
  border-radius: 8px; color: var(--text-dim);
  width: 34px; height: 34px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: color .15s, border-color .15s;
}
#docs-btn:hover, #docs-btn.active { color: var(--accent); border-color: var(--accent); }

.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px;
}

.header-name { font-weight: 600; font-size: 15px; }
.header-status { font-size: 12px; color: var(--text-dim); }
.header-status.online { color: #4ade80; }

.badge {
  font-size: 11px; font-weight: 600; padding: 3px 10px;
  border-radius: 20px; letter-spacing: .5px; text-transform: uppercase;
}
.badge.jose { background: #1e3a5f; color: var(--accent); border: 1px solid var(--accent); }
.badge.dev  { background: #2d1e5f; color: var(--accent2); border: 1px solid var(--accent2); }

/* ── Main area (chat + docs panel) ────────────────── */
#main-area { flex: 1; display: flex; overflow: hidden; }

/* ── Messages ──────────────────────────────────────── */
#messages {
  flex: 1; overflow-y: auto; min-width: 0;
  padding: 16px 12px;
  display: flex; flex-direction: column; gap: 8px;
  scroll-behavior: smooth;
}

.msg {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: var(--radius);
  line-height: 1.55;
  word-break: break-word;
  white-space: pre-wrap;
  font-size: 14px;
  animation: fadeUp .15s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg.user  { align-self: flex-end; background: var(--bubble-user); border-bottom-right-radius: 4px; }
.msg.nix   { align-self: flex-start; background: var(--bubble-nix); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.system { align-self: center; background: transparent; color: var(--text-dim); font-size: 12px; max-width: 100%; text-align: center; padding: 4px 0; }

.msg.nix.streaming::after {
  content: '▊';
  display: inline-block;
  animation: blink .7s infinite;
  color: var(--accent);
  margin-left: 2px;
}
@keyframes blink { 50% { opacity: 0; } }

/* Code blocks */
.msg code {
  background: var(--surface2);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
}

/* ── Input bar ─────────────────────────────────────── */
.input-bar {
  display: flex; align-items: flex-end; gap: 8px;
  padding: 10px 12px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#msg-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 10px 16px;
  color: var(--text);
  font-size: 14px;
  resize: none;
  outline: none;
  max-height: 120px;
  overflow-y: auto;
  line-height: 1.4;
  font-family: inherit;
}
#msg-input:focus { border-color: var(--accent); }

#send-btn {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent);
  border: none; color: #fff;
  cursor: pointer; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: opacity .15s, background .15s;
  padding: 0;
}
#send-btn:disabled { background: var(--surface2); cursor: default; opacity: .5; }
#send-btn:not(:disabled):hover { opacity: .88; }

/* Scrollbar */
#messages::-webkit-scrollbar { width: 4px; }
#messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── Docs panel ────────────────────────────────────── */
#docs-panel {
  width: 320px; flex-shrink: 0;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow: hidden;
  animation: slideIn .2s ease;
}
@keyframes slideIn { from { width: 0; opacity: 0; } to { width: 320px; opacity: 1; } }

.docs-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; font-weight: 600; color: var(--text-dim);
  flex-shrink: 0;
}
#docs-close {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 14px; padding: 2px 6px; border-radius: 4px;
}
#docs-close:hover { color: var(--text); }

#docs-content {
  flex: 1; overflow-y: auto; padding: 12px;
}

.docs-category {
  margin-bottom: 16px;
}
.docs-cat-title {
  font-size: 10px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--accent);
  padding: 4px 0 8px; border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}
.docs-item {
  padding: 8px 10px; border-radius: 8px; cursor: pointer;
  margin-bottom: 2px; transition: background .12s;
}
.docs-item:hover { background: var(--surface2); }
.docs-item-title { font-size: 13px; color: var(--text); line-height: 1.3; }
.docs-item-meta  { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

/* Expanded doc entry */
.docs-item.expanded { background: var(--surface2); }
.docs-item-body {
  font-size: 12px; color: var(--text-dim);
  margin-top: 8px; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word;
  border-top: 1px solid var(--border); padding-top: 8px;
}
.docs-item-body code {
  background: var(--bg); border-radius: 3px;
  padding: 1px 4px; font-size: 11px;
}

@media (max-width: 480px) {
  .login-box { width: 90vw; padding: 32px 20px; }
  .msg { max-width: 90%; }
  #docs-panel { width: 100%; position: absolute; top: 56px; bottom: 60px; left: 0; right: 0; z-index: 10; }
  @keyframes slideIn { from { opacity: 0; } to { opacity: 1; } }
}