/* ============================================================
   layout.css — Light theme panel layout
   ============================================================ */

/* ── Header ──────────────────────────────────────────────── */
.header {
  height: var(--header-h);
  background: var(--bg1);
  border-bottom: 1px solid var(--border2);
  box-shadow: 0 1px 3px rgba(15,23,42,0.05);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 14px;
  flex-shrink: 0;
  z-index: 50;
  position: relative;
}

/* ── Logo ────────────────────────────────────────────────── */
.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  text-decoration: none;
  color: var(--text);
}

.logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
  font-family: var(--font-head);
  color: white;
  letter-spacing: -0.5px;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.header-sep { width: 1px; height: 18px; background: var(--border2); }

/* ── Header nav ──────────────────────────────────────────── */
.header-nav { display: flex; gap: 2px; }

.header-tab {
  padding: 5px 13px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text3);
  cursor: pointer;
  border: 1px solid transparent;
  background: none;
  transition: color var(--dur-fast), background var(--dur-fast),
              border-color var(--dur-fast);
  font-family: var(--font-body);
  letter-spacing: 0.01em;
}
.header-tab:hover { color: var(--text2); background: var(--bg2); }
.header-tab.active {
  color: var(--indigo);
  background: var(--indigo3);
  border-color: rgba(var(--indigo-rgb), 0.20);
  font-weight: 600;
}

a.header-tab {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.header-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }

/* ── Shared header controls ──────────────────────────────── */
#theme-btn {
  width: 30px; height: 30px; border-radius: 7px;
  border: 1px solid var(--border2); background: none;
  cursor: pointer; font-size: 14px; color: var(--text3);
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background var(--dur-fast), border-color var(--dur-fast);
  font-family: inherit;
}
#theme-btn:hover { background: var(--bg2); border-color: var(--border3); }

#nav-auth { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.nav-user-name {
  font-size: 11px; font-family: var(--font-mono); color: var(--text3);
  max-width: 110px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nav-signout-btn {
  font-size: 11px; font-weight: 600; color: var(--text3); background: none;
  border: 1px solid var(--border2); cursor: pointer; padding: 4px 10px;
  border-radius: 6px; font-family: var(--font-body);
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
  white-space: nowrap;
}
.nav-signout-btn:hover { background: var(--bg2); color: var(--text); border-color: var(--border3); }
.nav-signin-link {
  font-size: 11px; font-weight: 600; color: var(--indigo); padding: 4px 12px;
  background: var(--indigo3); border: 1px solid rgba(var(--indigo-rgb),0.2);
  border-radius: 20px; text-decoration: none; white-space: nowrap;
  transition: background var(--dur-fast);
}
.nav-signin-link:hover { background: rgba(var(--indigo-rgb),0.14); }

.version-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bg2);
  color: var(--text3);
  border: 1px solid var(--border2);
  letter-spacing: 0.04em;
}

/* ── Body wrap ───────────────────────────────────────────── */
.body-wrap {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
  z-index: 1;
  min-height: 0;
}

/* ── Left sidebar ────────────────────────────────────────── */
.left-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  position: relative;
  transition: width 0.22s cubic-bezier(0.4,0,0.2,1),
              border-color 0.22s ease;
}
.left-sidebar.panel-collapsed {
  width: 0 !important;
  border-color: transparent;
}


.sidebar-section {
  padding: 14px 12px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 1;
  min-height: 0;
  max-height: 45%;
  overflow-y: auto;
}

.params-section {
  padding: 14px 12px;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}

/* ── Center panel ────────────────────────────────────────── */
.center-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  background: var(--bg0);
}

/* Metric bar */
.metric-bar {
  display: flex;
  gap: 0;
  padding: 0;
  background: var(--bg1);
  border-bottom: 1px solid var(--border2);
  flex-shrink: 0;
  overflow-x: auto;
  overflow-y: hidden;
  align-items: stretch;
}

/* Steps area */
.steps-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  align-items: stretch;
  background: var(--bg0);
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.steps-inner {
  width: 100%;
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Right panel ─────────────────────────────────────────── */
.right-panel {
  width: var(--rightbar-w);
  flex-shrink: 0;
  background: var(--bg1);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  transition: width 0.22s cubic-bezier(0.4,0,0.2,1),
              border-color 0.22s ease;
}
.right-panel.panel-collapsed {
  width: 0 !important;
  border-color: transparent;
}

.right-panel-tabs {
  display: flex;
  background: var(--bg0);
  border-bottom: 1px solid var(--border2);
  flex-shrink: 0;
  padding: 0 4px;
}

.rp-content {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  min-height: 0;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1180px) {
  .right-panel  { width: 280px; }
  .left-sidebar { width: 220px; }
}
/* ── Phase nav ────────────────────────────────────────────── */
.phase-nav {
  display: flex;
  align-items: center;
  background: var(--bg1);
  border-bottom: 1px solid var(--border2);
  flex-shrink: 0;
  padding: 0 16px;
  height: 44px;
  overflow-x: auto;
  gap: 2px;
}

.phase-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 12px;
  height: 44px;
  border: none;
  background: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text3);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  flex-shrink: 0;
  margin-bottom: -1px;
  transition: color var(--dur-fast);
}
.phase-btn:hover { color: var(--text); }
.phase-btn.active {
  color: var(--indigo);
  font-weight: 600;
  border-bottom-color: var(--indigo);
}

.phase-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg3);
  color: var(--text3);
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--dur-fast), color var(--dur-fast);
}
.phase-btn.active .phase-num {
  background: var(--indigo);
  color: white;
}

.phase-sep {
  color: var(--text4);
  font-size: 13px;
  padding: 0 3px;
  pointer-events: none;
  flex-shrink: 0;
  user-select: none;
}

.phase-nav-spacer { flex: 1; }

.panel-toggle {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 1px solid var(--border2);
  background: var(--bg0);
  color: var(--text3);
  cursor: pointer;
  font-size: 14px;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--dur-fast), color var(--dur-fast),
              border-color var(--dur-fast);
  line-height: 1;
  margin-left: 4px;
}
.panel-toggle:hover {
  background: var(--bg2);
  color: var(--text);
  border-color: var(--border3);
}
.panel-toggle.active {
  background: var(--indigo3);
  color: var(--indigo);
  border-color: rgba(var(--indigo-rgb), 0.25);
}

@media (max-width: 920px)  { .right-panel  { display: none; } }
@media (max-width: 680px)  {
  .left-sidebar { display: none; }
  .steps-area   { padding: 12px; }
  .phase-btn    { padding: 0 8px; }
  .phase-lbl    { display: none; }
}