:root {
  --color-panel-bg:      #f5f5f5;
  --color-app-bg:        #ffffff;
  --color-border:        #d0d0d0;
  --color-border-strong: #b0b0b0;
  --color-accent:        #0078d4;
  --color-text:          #1a1a1a;
  --color-text-muted:    #666666;
  --color-collection:    #444444;
  --color-active-bg:     #dce8f7;
  --color-active-text:   #004a94;
  --sidebar-width:       230px;
  --topbar-height:       72px;
  --filter-strip-height: 0px;
  --font-base:           13px;
  --font-small:          12px;
  --font-tiny:           11px;
}

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

html, body {
  margin: 0; padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: var(--font-base);
  color: var(--color-text);
  background: var(--color-app-bg);
  height: 100%;
}

/* ── Top bar ───────────────────────────────────────────────────── */

.topbar {
  position: fixed; top: 0; left: 0; right: 0;
  background: var(--color-panel-bg);
  border-bottom: 1px solid var(--color-border);
  display: flex; flex-wrap: wrap; align-items: center;
  padding: 0 10px;
  z-index: 200;
}

.topbar-left {
  display: flex; align-items: center; gap: 8px;
  width: 100%; height: 40px;
}

.topbar-right {
  display: flex; align-items: center; gap: 12px;
  width: 100%; height: 32px;
}

.app-title {
  font-weight: 600; font-size: var(--font-base);
  color: var(--color-text); text-decoration: none;
}

.hamburger {
  background: none; border: none; cursor: pointer;
  font-size: 18px; padding: 2px 4px; line-height: 1;
  color: var(--color-text);
  display: none;
}

.topbar-control {
  font-size: var(--font-small);
  display: flex; align-items: center; gap: 4px;
}

.topbar-control select {
  font-size: var(--font-small);
  border: 1px solid var(--color-border-strong);
  border-radius: 4px;
  padding: 2px 4px;
  background: var(--color-app-bg);
  color: var(--color-text);
}

/* ── Filter strip ──────────────────────────────────────────────── */

.filter-strip {
  position: fixed;
  top: var(--topbar-height); left: 0; right: 0;
  z-index: 190;
  background: var(--color-panel-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 6px 8px;
  display: flex; flex-direction: column; gap: 5px;
}

/* ── Layout ────────────────────────────────────────────────────── */

.layout {
  display: flex;
  margin-top: calc(var(--topbar-height) + var(--filter-strip-height));
  height: calc(100vh - var(--topbar-height) - var(--filter-strip-height));
}

/* ── Sidebar ───────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-panel-bg);
  display: flex; flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.resize-handle {
  width: 4px;
  background: var(--color-border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.15s;
}

.resize-handle:hover,
.resize-handle.dragging {
  background: var(--color-accent);
}

.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 150;
}

.control-row {
  display: flex; align-items: center; gap: 6px;
  font-size: var(--font-tiny);
}

.control-row select {
  flex: 1;
  font-size: var(--font-tiny);
  border: 1px solid var(--color-border-strong);
  border-radius: 3px;
  padding: 2px 3px;
  background: var(--color-app-bg);
  color: var(--color-text);
}

.search-row { display: flex; gap: 4px; align-items: center; }

.scope-select {
  flex-shrink: 0;
  width: 100px;
  font-size: var(--font-tiny);
  border: 1px solid var(--color-border-strong);
  border-radius: 4px;
  padding: 2px 2px;
  background: var(--color-app-bg);
  color: var(--color-text);
}

.search-input {
  flex: 1;
  font-size: var(--font-small);
  border: 1px solid var(--color-border-strong);
  border-radius: 4px;
  padding: 3px 6px;
  background: var(--color-app-bg);
  color: var(--color-text);
}

.tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.sidebar-footer {
  padding: 4px 8px;
  font-size: var(--font-tiny);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* Tree nodes */

.tree-collection {
  padding: 5px 8px 2px;
  font-size: var(--font-tiny);
  font-weight: 700;
  color: var(--color-collection);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: default;
  user-select: none;
}

.tree-dir {
  padding: 2px 8px;
  font-size: var(--font-small);
  cursor: pointer;
  user-select: none;
  display: flex; align-items: center; gap: 4px;
  color: var(--color-text);
}

.tree-dir:hover { background: rgba(0,0,0,0.04); }

.tree-dir-icon {
  font-size: 10px;
  color: var(--color-text-muted);
  transition: transform 0.15s;
  width: 10px; text-align: center;
}

.tree-dir.collapsed .tree-dir-icon { transform: rotate(-90deg); }

.tree-children { overflow: hidden; }
.tree-children.collapsed { display: none; }

.tree-recipe {
  display: block;
  padding: 2px 8px 2px 22px;
  font-size: var(--font-small);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: inherit;
  text-decoration: none;
}

.tree-recipe:hover { background: rgba(0,0,0,0.04); }

.tree-recipe.active {
  background: var(--color-active-bg);
  color: var(--color-active-text);
  font-weight: 500;
}

.tree-recipe.search-hidden,
.tree-dir.search-hidden,
.tree-children.search-hidden {
  display: none;
}

.tree-recipe.untranslated {
  color: var(--color-text-muted);
  font-style: italic;
}

/* ── Content ───────────────────────────────────────────────────── */

.content {
  flex: 1;
  overflow-y: auto;
  padding: 20px 28px;
  max-width: 780px;
}

.welcome { color: var(--color-text-muted); margin-top: 40px; }

/* Recipe layout */

.recipe-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--color-text);
}

.recipe-meta {
  font-size: var(--font-small);
  color: var(--color-text-muted);
  margin-bottom: 16px;
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
}

.recipe-meta a { color: var(--color-accent); text-decoration: none; }
.recipe-meta a:hover { text-decoration: underline; }

.recipe-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0 0 16px;
}

.section-heading {
  font-size: var(--font-base);
  font-weight: 600;
  margin: 18px 0 6px;
  color: var(--color-text);
}

.group-heading {
  font-size: var(--font-small);
  font-weight: 600;
  margin: 12px 0 4px;
  color: var(--color-text-muted);
}

.ingredient-list {
  list-style: none;
  margin: 0 0 6px;
  padding: 0;
}

.ingredient-list li {
  font-size: var(--font-base);
  padding: 2px 0;
  display: flex; gap: 6px;
}

.ing-qty { min-width: 36px; text-align: right; color: var(--color-text-muted); }
.ing-unit { min-width: 30px; color: var(--color-text-muted); }
.ing-name { flex: 1; }
.ing-prep { color: var(--color-text-muted); font-style: italic; }
.ing-prep::before { content: '– '; }

.instruction-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.instruction-step {
  display: flex; gap: 12px;
  margin-bottom: 12px;
  font-size: var(--font-base);
  line-height: 1.5;
}

.step-number {
  min-width: 22px;
  font-weight: 600;
  color: var(--color-accent);
  text-align: right;
  padding-top: 1px;
}

.step-body { flex: 1; }
.step-label { font-weight: 600; }

.step-body a { color: var(--color-accent); text-decoration: none; }
.step-body a:hover { text-decoration: underline; }

.provenance {
  margin-top: 24px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: var(--font-tiny);
  color: var(--color-text-muted);
}

.provenance a { color: var(--color-text-muted); }
.provenance a:hover { color: var(--color-accent); }

/* ── Sidebar reset button ──────────────────────────────────────── */

.btn-reset {
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: 3px;
  padding: 0 6px;
  font-size: var(--font-tiny);
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
  flex-shrink: 0;
}

.btn-reset:hover {
  background: rgba(0,0,0,0.06);
  color: var(--color-text);
}

/* ── Mobile ────────────────────────────────────────────────────── */

@media (max-width: 767px) {
  .hamburger { display: block; }

  .resize-handle { display: none; }

  .sidebar {
    position: fixed;
    top: calc(var(--topbar-height) + var(--filter-strip-height));
    left: 0; bottom: 0;
    z-index: 160;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    width: min(var(--sidebar-width), 85vw);
  }

  .sidebar.open { transform: translateX(0); }

  .sidebar-overlay { display: block; }

  .content {
    padding: 14px 16px;
    max-width: 100%;
  }
}