/* ============================================================
   WORKSPACE DOCUMENT TABS — Phase 1
   Chrome-level strip sitting under .topbar. Hidden when empty.
   Tokens-driven; uses Lex palette variables from design-system.css.
============================================================ */

.workspace-tabs {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.75rem 0;
  background: var(--paper-3, #efece4);
  border-bottom: 1px solid var(--paper-edge, #e6e1d3);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  transition: opacity 0.15s ease;
}

.workspace-tabs::-webkit-scrollbar { height: 4px; }
.workspace-tabs::-webkit-scrollbar-thumb {
  background: var(--ink-5, #a8a08e);
  border-radius: 2px;
}

.workspace-tabs[hidden] { display: none !important; }

.workspace-tabs.dimmed {
  opacity: 0.55;
}

/* ── Individual tab ─────────────────────────────────────────── */

.workspace-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 0 auto;
  max-width: 14rem;
  min-width: 7rem;
  height: 2rem;
  padding: 0 0.55rem 0 0.625rem;
  background: var(--paper-3, #efece4);
  border: 1px solid transparent;
  border-bottom: none;
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  cursor: pointer;
  color: var(--ink-4, #7a7264);
  font-family: var(--font-sans, 'DM Sans', system-ui, sans-serif);
  font-size: 0.78rem;
  font-weight: 500;
  position: relative;
  top: 1px;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.workspace-tab:hover {
  background: var(--paper-2, #ffffff);
  color: var(--ink-3, #524c3f);
}

.workspace-tab.is-active {
  background: var(--paper-2, #ffffff);
  color: var(--ink, #1a1814);
  border-color: var(--paper-edge, #e6e1d3);
  /* Sit flush over the strip bottom border */
  border-bottom: 1px solid var(--paper-2, #ffffff);
  z-index: 1;
}

.workspace-tab.is-active::after {
  /* gold accent on top edge */
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--gold, #a8803a);
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
}

.workspace-tab-glyph {
  flex: 0 0 auto;
  display: inline-flex;
  color: var(--ink-5, #a8a08e);
}

.workspace-tab.is-active .workspace-tab-glyph {
  color: var(--gold, #a8803a);
}

.workspace-tab-title {
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

/* ── Dirty dot ──────────────────────────────────────────────── */

.workspace-tab-dirty {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--warn, #a06a1f);
  opacity: 0;
  transition: opacity 0.12s ease;
}

.workspace-tab.is-dirty .workspace-tab-dirty {
  opacity: 1;
}

/* ── Close X ────────────────────────────────────────────────── */

.workspace-tab-close {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 4px;
  color: var(--ink-5, #a8a08e);
  opacity: 0;
  transition: opacity 0.12s ease, background 0.12s ease, color 0.12s ease;
  cursor: pointer;
}

.workspace-tab:hover .workspace-tab-close,
.workspace-tab.is-active .workspace-tab-close {
  opacity: 1;
}

.workspace-tab-close:hover {
  background: var(--paper-edge, #e6e1d3);
  color: var(--err, #8a2a26);
}

/* When dirty AND not hovered, show the dot in the close slot.
   Hover the tab to reveal the close X — the dot fades. */
.workspace-tab.is-dirty:not(:hover):not(.is-active) .workspace-tab-close {
  opacity: 0;
}

/* ── Responsive ─────────────────────────────────────────────── */

@media (max-width: 768px) {
  .workspace-tabs {
    padding: 0.375rem 0.5rem 0;
  }
  .workspace-tab {
    max-width: 10rem;
    min-width: 5.5rem;
    height: 2.125rem;
    padding: 0 0.5rem;
    font-size: 0.75rem;
  }
  .workspace-tab-close {
    /* Touch-friendly hit area */
    width: 1.5rem;
    height: 1.5rem;
    opacity: 1;
  }
  .workspace-tab-glyph {
    display: none;
  }
}

/* ── High contrast ──────────────────────────────────────────── */

body.hc .workspace-tab {
  border-color: var(--hc-border, #000);
  color: var(--hc-ink, #000);
}
body.hc .workspace-tab.is-active {
  background: var(--hc-surface, #fff);
  outline: 2px solid var(--hc-border, #000);
}

/* ── "+" add-tab button + doc picker dropdown ─────────────────── */

.workspace-tab-add-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  align-self: center;
  margin-left: 0.25rem;
  flex: 0 0 auto;
}

.workspace-tab-add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--ink-4, #7a7264);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
  position: relative;
  top: 1px;
}
.workspace-tab-add:hover {
  background: var(--paper-2, #ffffff);
  color: var(--ink, #1a1814);
}

.workspace-add-dropdown {
  /* Fixed so it escapes the strip's overflow clipping. JS sets top/left
     from the + button's bounding rect each time it opens. */
  position: fixed;
  width: 22rem;
  max-width: calc(100vw - 2rem);
  max-height: 22rem;
  background: var(--paper-2, #ffffff);
  border: 1px solid var(--paper-edge, #e6e1d3);
  border-radius: 6px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.10);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.workspace-add-dropdown[hidden] { display: none; }

.workspace-add-search {
  padding: 0.6rem 0.8rem;
  font-size: 0.8rem;
  border: none;
  border-bottom: 1px solid var(--paper-edge, #e6e1d3);
  outline: none;
  font-family: var(--font-sans, 'DM Sans', system-ui, sans-serif);
  color: var(--ink, #1a1814);
  background: transparent;
}
.workspace-add-search::placeholder { color: var(--ink-5, #a8a08e); }

.workspace-add-list {
  overflow-y: auto;
  max-height: 18rem;
}

.workspace-add-empty {
  padding: 1rem 0.85rem;
  font-size: 0.78rem;
  color: var(--ink-5, #a8a08e);
  text-align: center;
}

.workspace-add-doc {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.8rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-soft, #ebe6d6);
  text-align: left;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font-sans, 'DM Sans', system-ui, sans-serif);
  color: var(--ink, #1a1814);
  transition: background 0.1s ease;
}
.workspace-add-doc:last-child { border-bottom: none; }
.workspace-add-doc:hover { background: var(--paper-3, #efece4); }

.workspace-add-doc-title {
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.workspace-add-doc-matter {
  flex: 0 0 auto;
  font-size: 0.7rem;
  color: var(--ink-4, #7a7264);
  white-space: nowrap;
  max-width: 9rem;
  overflow: hidden;
  text-overflow: ellipsis;
}

.workspace-add-doc-tag {
  flex: 0 0 auto;
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gold, #a8803a);
  padding: 0.1rem 0.35rem;
  background: var(--gold-wash, #f5ecd6);
  border-radius: 3px;
}

.workspace-add-doc.is-open { opacity: 0.55; }
.workspace-add-doc.is-open:hover { opacity: 0.85; }

@media (max-width: 768px) {
  .workspace-add-dropdown {
    width: calc(100vw - 1.5rem);
    left: 0;
  }
  .workspace-add-doc-matter { display: none; }
}