/* ============================================================
   LAYOUT — Shell, Sidebar, Main, Header, Chat Area, Input Bar
   ============================================================ */

/* ── Shell ── */
.shell {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg2);
  border-right: 0.5px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 18px 14px 14px;
  border-bottom: 0.5px solid var(--border);
}

.nd-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nd-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg4);
  border: 0.5px solid var(--border2);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: 0.03em;
}

.nd-name {
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}

.nd-role {
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-mono);
  margin-top: 2px;
}

.sidebar-section {
  padding: 14px 8px 6px;
}

.sidebar-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0 6px;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

/* ── Nav items ── */
.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text2);
  font-size: 15px;
  transition: background 0.15s, color 0.15s;
  user-select: none;
  border: 0.5px solid transparent;
  margin-bottom: 2px;
}

.nav-item:hover {
  background: var(--bg3);
  color: var(--text);
}

.nav-item.active {
  background: var(--bg3);
  color: var(--text);
  border-color: var(--border);
}

/* Nav dots */
.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  opacity: 0.7;
}

.dot-green  { background: #4a9960; }
.dot-blue   { background: #4a7aaa; }
.dot-amber  { background: #c9a030; }
.dot-teal   { background: #30a0a0; }
.dot-red    { background: #c04040; }
.dot-accent { background: var(--accent); }

/* ── Sidebar footer ── */
.sidebar-footer {
  margin-top: auto;
  padding: 12px 14px;
  border-top: 0.5px solid var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4a9960;
  display: inline-block;
  margin-right: 5px;
  animation: pulse 2.5s ease-in-out infinite;
}

/* ── Main area ── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

/* ── Main header ── */
.main-header {
  padding: 14px 24px;
  border-bottom: 0.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.main-header-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.main-title {
  font-size: 19px;
  font-weight: 500;
  color: var(--text);
}

.main-subtitle {
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-mono);
}

.header-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 5px 13px;
  border-radius: 99px;
  background: var(--green-t);
  color: #4a9960;
  border: 0.5px solid var(--green);
  letter-spacing: 0.05em;
}

/* ── Chat area ── */
.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: 32px 56px 24px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

/* ── Tab content ── */
.tab-content {
  display: none;
  flex-direction: column;
  gap: 26px;
  animation: fadeIn 0.2s ease;
}

.tab-content.active {
  display: flex;
}

/* ── Decorative input bar ── */
.input-bar {
  padding: 12px 56px 18px;
  flex-shrink: 0;
}

.input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg2);
  border: 0.5px solid var(--border2);
  border-radius: 14px;
  padding: 11px 16px;
  cursor: default;
}

.input-placeholder {
  flex: 1;
  font-size: 15px;
  color: var(--text3);
  font-family: var(--font-mono);
  user-select: none;
  letter-spacing: 0.01em;
}

.input-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-hint {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text3);
  padding: 4px 9px;
  border: 0.5px solid var(--border);
  border-radius: 4px;
}

.send-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--bg4);
  border: 0.5px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  opacity: 0.5;
}