/* ============== TOKENS ============== */
:root {
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --bg-table-head: #f4f5f7;
  --border: #e5e5ea;
  --border-soft: #ececef;
  --text: #1a1a1f;
  --text-muted: #6b7280;
  --text-dim: #9ca3af;
  --accent: #1f6ac0;
  --accent-bg: #e8f1fb;
  --accent-border: #b8d2ed;
  --note-info-bg: #e8f1fb;     --note-info-border: #b8d2ed;     --note-info-fg: #1f6ac0;
  --note-compare-bg: #f5efff;  --note-compare-border: #d4bff0;  --note-compare-fg: #6d28d9;
  --note-tip-bg: #e8f8ee;      --note-tip-border: #b9e0c2;     --note-tip-fg: #047857;
  --note-warn-bg: #fef5dd;     --note-warn-border: #ecd194;    --note-warn-fg: #92400e;
  --mark-bg: #fff2a8;

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-greek: Georgia, "Times New Roman", serif;

  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-6: 24px;
  --radius: 8px;
  --shadow-1: 0 1px 0 rgba(0,0,0,.04);
  --shadow-overlay: 0 24px 60px rgba(0,0,0,.25);
}

/* ============== RESET / BASE ============== */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { overflow-x: hidden; }            /* safety net against rogue overflow */
body {
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
kbd { font-family: var(--font-ui); font-size: .85em; padding: 1px 6px;
      background: #fff; border: 1px solid var(--border); border-radius: 3px; }
mark { background: var(--mark-bg); color: inherit; padding: 0 2px; border-radius: 2px; }

/* Greek text — serif */
.ex-el, .vc-lemma, .turn-el, .vc-form-greek, .tldr-form { font-family: var(--font-greek); }

/* ============== HEADER ============== */
.app-header {
  position: sticky; top: 0; z-index: 20;
  display: grid; grid-template-columns: auto auto 1fr auto;
  gap: var(--space-3); align-items: center;
  padding: var(--space-2) var(--space-4);
  background: var(--bg); border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-1);
}
.hamburger {
  display: none; appearance: none; border: 0; background: transparent;
  font-size: 20px; padding: 4px 8px; color: var(--text); cursor: pointer;
}
.brand { font-weight: 600; color: var(--text); font-size: 14px; white-space: nowrap; }
.search-trigger {
  display: flex; align-items: center; gap: var(--space-2);
  padding: 8px 12px; background: #f3f4f6;
  border: 1px solid #dadce0; border-radius: var(--radius);
  cursor: text; min-height: 40px;
}
.search-trigger .search-placeholder { color: var(--text-muted); flex: 1; font-size: 14px; }
.search-trigger .search-icon { color: var(--text-muted); }
.search-trigger .search-shortcut { margin-left: auto; color: var(--text-muted); }
.theme-toggle {
  appearance: none; border: 0; background: transparent;
  font-size: 16px; cursor: pointer; padding: 4px;
  color: var(--text-muted); opacity: .55;
}
.theme-toggle[disabled] { cursor: not-allowed; }

/* ============== LAYOUT ============== */
.app-layout { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 56px); }
.app-sidebar { padding: var(--space-3); border-right: 1px solid var(--border); background: var(--bg-soft); }
.app-main { padding: var(--space-6); max-width: 880px; }
.breadcrumb { color: var(--text-muted); font-size: 12px; margin-bottom: var(--space-3); }

/* ============== SIDEBAR ============== */
.sidebar-section { margin-bottom: var(--space-4); }
.sidebar-section-title {
  text-transform: uppercase; letter-spacing: .05em; font-size: 10px;
  color: var(--text-dim); margin-bottom: var(--space-1);
}
.sidebar-item {
  display: block; padding: 4px 8px; border-radius: 4px;
  font-size: 13px; color: var(--text); text-decoration: none;
}
.sidebar-item:hover { background: rgba(0,0,0,.03); text-decoration: none; }
.sidebar-item.is-active { background: var(--accent-bg); color: var(--accent); font-weight: 500; }
.sidebar-preset { padding-left: 18px; color: var(--text-muted); font-size: 12.5px; }
.sidebar-loading { color: var(--text-muted); font-size: 12px; }

/* ============== TOPIC ============== */
.topic-eyebrow { font-size: 11px; color: var(--text-dim); text-transform: uppercase;
                 letter-spacing: .05em; margin-bottom: 4px; }
.topic-title { margin: 0 0 4px; font-size: 22px; }
.topic-summary { margin: 0 0 var(--space-4); color: var(--text-muted); font-size: 14px; }
.topic-meta { margin-top: var(--space-4); font-size: 12px; color: var(--text-dim); }

/* ============== BLOCKS ============== */
.block { margin: var(--space-3) 0; }
.block-caption { font-size: 11px; color: var(--text-muted); text-transform: uppercase;
                 letter-spacing: .04em; margin-bottom: 4px; }
.block-text { margin: var(--space-2) 0; }

.block-tldr {
  background: var(--note-info-bg); border: 1px solid var(--note-info-border);
  border-radius: var(--radius); padding: var(--space-3) var(--space-4);
}
.tldr-label { font-size: 11px; color: var(--note-info-fg); text-transform: uppercase;
              letter-spacing: .05em; font-weight: 600; margin-bottom: var(--space-2); }
.tldr-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-2); }
.tldr-item { display: flex; gap: 6px; align-items: baseline; min-width: 0; flex-wrap: wrap; }
.tldr-person { color: var(--text-muted); font-size: 12px; }
.tldr-form { font-size: 15px; min-width: 0; word-break: break-word; }

.block-table .table-scroll { overflow-x: auto; }
.block-table table { width: 100%; border-collapse: collapse; background: var(--bg);
                     border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.block-table th { text-align: left; padding: 6px 10px; background: var(--bg-table-head);
                  color: var(--text-muted); font-weight: 500; font-size: 13px;
                  border-bottom: 1px solid var(--border); }
.block-table td { padding: 6px 10px; border-bottom: 1px solid var(--border-soft); font-size: 13.5px; }
.block-table tr:last-child td { border-bottom: 0; }
.block-table td.row-label { color: var(--text-muted); }

.block-examples .examples { list-style: none; padding: 0; margin: 0;
                            display: flex; flex-direction: column; gap: 4px; }
.block-examples li { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
                     gap: var(--space-3); align-items: baseline;
                     padding: 6px 10px; background: var(--bg-soft);
                     border: 1px solid var(--border-soft); border-radius: 6px; font-size: 13.5px; }
.ex-el { font-size: 14px; }
.ex-ru { color: var(--text-muted); }
.ex-tag { font-size: 11px; color: var(--text-dim); justify-self: end; }

.block-note { padding: var(--space-3) var(--space-4); border-left: 3px solid; border-radius: 0 var(--radius) var(--radius) 0; }
.note-label { font-size: 11px; text-transform: uppercase; letter-spacing: .05em;
              font-weight: 600; margin-bottom: 4px; }
.note-info { background: var(--note-info-bg); border-color: var(--note-info-fg); }
.note-info .note-label { color: var(--note-info-fg); }
.note-tip { background: var(--note-tip-bg); border-color: var(--note-tip-fg); }
.note-tip .note-label { color: var(--note-tip-fg); }
.note-warning { background: var(--note-warn-bg); border-color: var(--note-warn-fg); }
.note-warning .note-label { color: var(--note-warn-fg); }
.note-compare-ru { background: var(--note-compare-bg); border-color: var(--note-compare-fg); }
.note-compare-ru .note-label { color: var(--note-compare-fg); }

.block-list { padding-left: 20px; }
.block-subsection h4 { margin: var(--space-4) 0 var(--space-2); font-size: 15px; }

.see-also { margin-top: var(--space-4); }
.see-also h4 { margin: 0 0 var(--space-2); font-size: 14px; }
.see-also-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.see-also-list a { display: inline-block; padding: 4px 10px; font-size: 13px;
                   background: var(--accent-bg); border: 1px solid var(--accent-border);
                   border-radius: 99px; color: var(--accent); }
.see-also-list a:hover { text-decoration: none; }

/* ============== DIALOGUE ============== */
.turns { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-3); }
.turn { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4);
        background: var(--bg-soft); border: 1px solid var(--border-soft); border-radius: var(--radius);
        padding: var(--space-3) var(--space-4); }
.turn-bot { display: flex; flex-direction: column; gap: 2px; }
.turn-el { font-size: 15px; }
.turn-ru { color: var(--text-muted); font-size: 13px; }
.turn-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase;
              letter-spacing: .04em; margin-bottom: 4px; }
.turn-responses ul { margin: 0; padding-left: 18px; font-family: var(--font-greek); font-size: 14px; }
.turn-hint { margin-top: var(--space-2); font-size: 12px; color: var(--text-muted); }

/* ============== VOCABULARY ============== */
.vocab-controls { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-3); }
.vocab-filter { padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
                font-size: 14px; max-width: 360px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.chips-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase;
               letter-spacing: .04em; margin-right: 4px; }
.chip { appearance: none; padding: 4px 10px; background: transparent;
        border: 1px solid var(--border); border-radius: 99px; font-size: 12.5px;
        color: var(--text-muted); cursor: pointer; }
.chip:hover { background: var(--bg-soft); }
.chip.is-active { background: var(--accent-bg); border-color: var(--accent-border); color: var(--accent); }

.vocab-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 5px; }
.vocab-card { background: var(--bg); border: 1px solid var(--border-soft); border-radius: 6px; }
.vocab-card summary { display: grid; grid-template-columns: 24px 1fr 1fr auto;
                       gap: var(--space-3); align-items: baseline;
                       padding: 7px 10px; cursor: pointer; list-style: none; }
.vocab-card summary::-webkit-details-marker { display: none; }
.vc-article { font-family: var(--font-greek); color: var(--text-muted); font-size: 12px; text-align: right; }
.vc-lemma { font-size: 14.5px; }
.vc-translation { color: var(--text-muted); font-size: 13.5px; }
.vc-pos { color: var(--text-dim); font-size: 11px; justify-self: end; }
.vc-body { padding: 0 10px 10px 38px; border-top: 1px dashed var(--border); margin-top: -1px; }
.vc-example { margin: 6px 0; display: flex; gap: var(--space-3); font-size: 13px; }
.vc-forms table { border-collapse: collapse; }
.vc-forms td { padding: 4px 12px 4px 0; font-size: 12.5px; }
.vc-form-tag { color: var(--text-muted); }
.vc-form-greek { font-family: var(--font-greek); }
.vc-form-ru { color: var(--text-muted); }

.vocab-card.is-hidden { display: none; }

/* ============== HOME ============== */
.home-section { margin-bottom: var(--space-6); }
.home-section h4 { margin: 0 0 var(--space-2); font-size: 15px; }
.home-topic-list { list-style: none; padding: 0; margin: 0;
                   display: flex; flex-wrap: wrap; gap: var(--space-2); }
.home-topic-list li a { display: inline-block; padding: 6px 12px;
                         background: var(--bg-soft); border: 1px solid var(--border-soft);
                         border-radius: 6px; font-size: 13.5px; color: var(--text); }
.home-presets { margin-top: var(--space-2); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

/* ============== MOBILE STICKY SEARCH ============== */
.mobile-search-bar { display: none; }

/* ============== SEARCH OVERLAY ============== */
.search-overlay[hidden] { display: none; }
.search-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(20, 30, 50, .45);
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 60px;
}
.search-panel {
  width: 540px; max-width: 92%; max-height: 80vh;
  background: var(--bg); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-overlay); display: flex; flex-direction: column; overflow: hidden;
}
.search-panel-input {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border-soft);
}
.search-panel-input input {
  flex: 1; border: 0; outline: none; font-size: 16px; color: var(--text);
  background: transparent; font-family: var(--font-greek);
}
.search-panel-results { flex: 1; overflow-y: auto; }
.search-result {
  display: grid; grid-template-columns: auto 1fr auto;
  gap: var(--space-3); align-items: center;
  padding: 8px 16px; border-bottom: 1px solid var(--border-soft);
  cursor: pointer;
}
.search-result.is-selected { background: var(--accent-bg); border-left: 3px solid var(--accent); }
.search-result-icon { width: 16px; text-align: center; color: var(--text-muted); }
.search-result-title { font-family: var(--font-greek); font-size: 14px; }
.search-result-subtitle { color: var(--text-muted); font-size: 12px; }
.search-result-crumb { color: var(--text-dim); font-size: 11px; }
.search-group-label { padding: 8px 16px 4px; font-size: 10px; color: var(--text-muted);
                      text-transform: uppercase; letter-spacing: .06em;
                      background: var(--bg-soft); border-bottom: 1px solid var(--border-soft); }
.search-panel-footer {
  display: flex; gap: var(--space-3); padding: 8px 14px;
  background: var(--bg-soft); border-top: 1px solid var(--border-soft);
  font-size: 11px; color: var(--text-muted);
}
.search-empty { padding: var(--space-4); color: var(--text-muted); font-size: 13px; text-align: center; }

/* ============== MOBILE BREAKPOINTS ============== */
@media (max-width: 1023px) {
  .hamburger { display: inline-block; }
  .app-layout { grid-template-columns: 1fr; }
  .app-sidebar {
    position: fixed; inset: 56px 0 0 0; z-index: 30;
    border-right: 0; transform: translateX(-100%); transition: transform .2s ease;
    overflow-y: auto;
  }
  .app-sidebar.is-open { transform: translateX(0); }
}

@media (max-width: 640px) {
  body { font-size: 14px; padding-bottom: 64px; } /* room for bottom search */
  .app-main { padding: var(--space-3); }
  .app-header > .search-trigger { display: none; }   /* desktop search hidden */
  .app-header { grid-template-columns: auto 1fr auto; }
  .mobile-search-bar {
    display: block; position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom)) 10px;
    background: var(--bg); border-top: 1px solid var(--border);
    box-shadow: 0 -2px 6px rgba(0,0,0,.04);
  }
  .search-trigger--mobile { width: 100%; padding: 10px 12px; min-height: 44px; }
  .topic-title { font-size: 18px; }
  .vocab-card summary { grid-template-columns: 18px 1fr auto; }
  .vc-translation { grid-column: 2 / 4; font-size: 12.5px; }
  .vc-pos { font-size: 10.5px; }
  .turn { grid-template-columns: 1fr; }
  .tldr-grid { grid-template-columns: 1fr 1fr; }
  .block-examples li { grid-template-columns: 1fr; }       /* stack el/ru/tag vertically on phones */
  .ex-tag { justify-self: start; }
  .block-table table { table-layout: auto; }
  .block-table .table-scroll { max-width: 100%; }
  .chips { overflow-x: auto; flex-wrap: nowrap; }
  .search-overlay { padding-top: 0; align-items: stretch; }
  .search-panel { width: 100%; max-width: 100%; max-height: 100%; border-radius: 0; border: 0; height: 100vh; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}