/* ThaiCards Design System — component primitives.
   All classes scoped under .tc-app so they don't fight existing style.css.
   Translated from Claude Design React handoff. */

/* ───── Buttons ─────────────────────────────────────────────────────── */
.tc-app .btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  border: 1px solid transparent; border-radius: var(--r-md);
  padding: 9px 14px; font-weight: 500; font-size: 13px; line-height: 1;
  letter-spacing: -0.005em; cursor: pointer; user-select: none;
  background: transparent; color: var(--text); white-space: nowrap;
  transition: background .15s, border-color .15s, color .15s, transform .08s;
}
.tc-app .btn:disabled { opacity: 0.45; cursor: not-allowed; }
.tc-app .btn.btn-sm { padding: 6px 10px; font-size: 12px; border-radius: var(--r-sm); }
.tc-app .btn.btn-md { padding: 9px 14px; font-size: 13px; }
.tc-app .btn.btn-lg { padding: 12px 18px; font-size: 14px; }
.tc-app .btn.btn-xl { padding: 14px 22px; font-size: 15px; }
.tc-app .btn.btn-full { width: 100%; }

.tc-app .btn-primary   { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.tc-app .btn-primary:hover:not(:disabled)   { background: var(--accent-hi); }
.tc-app .btn-warm      { background: var(--warm); color: var(--warm-ink); font-weight: 600; }
.tc-app .btn-warm:hover:not(:disabled)      { background: var(--warm-hi); }
.tc-app .btn-secondary { background: var(--bg-elev-1); color: var(--text); border-color: var(--line); }
.tc-app .btn-secondary:hover:not(:disabled) { background: var(--bg-elev-2); }
.tc-app .btn-ghost     { background: transparent; color: var(--text-2); }
.tc-app .btn-ghost:hover:not(:disabled)     { color: var(--text); }
.tc-app .btn-outline   { background: transparent; color: var(--text); border-color: var(--line-strong); }
.tc-app .btn-outline:hover:not(:disabled)   { border-color: var(--text-3); }
.tc-app .btn-danger    { background: transparent; color: var(--err); border-color: var(--line); }

/* Icon-only button — square */
.tc-app .btn-icon { padding: 9px; width: 36px; }
.tc-app .btn-icon.btn-sm { padding: 6px; width: 28px; }
.tc-app .btn-icon.btn-lg { padding: 12px; width: 44px; }

/* ───── Input ───────────────────────────────────────────────────────── */
.tc-app .input-wrap {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0 12px; height: 40px;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color .15s, box-shadow .15s;
}
.tc-app .input-wrap.input-sm { height: 32px; }
.tc-app .input-wrap.input-lg { height: 48px; }
.tc-app .input-wrap.input-full { width: 100%; display: flex; }
.tc-app .input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.tc-app .input-wrap .input-icon { color: var(--text-3); display: inline-flex; }
.tc-app .input-wrap input {
  flex: 1; min-width: 0; background: transparent; border: 0; outline: none;
  color: var(--text); font-size: 13px;
}
.tc-app .input-wrap.input-sm input { font-size: 12px; }
.tc-app .input-wrap.input-lg input { font-size: 14px; }
.tc-app .input-wrap input::placeholder { color: var(--text-dim); }
.tc-app .input-suffix { color: var(--text-3); font-size: 12px; }

/* ───── Card ────────────────────────────────────────────────────────── */
.tc-app .card {
  background: var(--bg-elev-0);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--pad-3);
  box-shadow: var(--sh-1);
  transition: border-color .15s, transform .15s, box-shadow .15s, background .15s;
}
.tc-app .card.card-elev-1 { background: var(--bg-elev-1); }
.tc-app .card.card-pad-2 { padding: var(--pad-2); }
.tc-app .card.card-pad-4 { padding: var(--pad-4); }
.tc-app .card.card-interactive { cursor: pointer; }
.tc-app .card.card-interactive:hover {
  border-color: var(--line-strong);
  background: var(--bg-elev-1);
}

/* ───── Badge ───────────────────────────────────────────────────────── */
.tc-app .badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 8px; border-radius: var(--r-pill);
  font-size: 11px; font-weight: 500; letter-spacing: -0.005em;
  white-space: nowrap; border: 1px solid transparent;
}
.tc-app .badge .badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; opacity: 0.9;
}
.tc-app .badge-neutral { background: var(--bg-elev-2); color: var(--text-2); border-color: var(--line); }
.tc-app .badge-accent  { background: var(--accent-tint); color: var(--accent); }
.tc-app .badge-warm    { background: var(--warm-tint); color: var(--warm); }
.tc-app .badge-ok      { background: oklch(0.78 0.13 155 / 0.12); color: var(--ok); }
.tc-app .badge-warn    { background: oklch(0.80 0.13 78 / 0.12); color: var(--warn); }
.tc-app .badge-err     { background: oklch(0.72 0.18 22 / 0.12); color: var(--err); }
.tc-app .badge-outline { background: transparent; color: var(--text-2); border-color: var(--line-strong); }

/* ───── Tabs (segmented) ────────────────────────────────────────────── */
.tc-app .tabs {
  display: inline-flex; padding: 3px; border-radius: var(--r-pill);
  background: var(--bg-elev-0); border: 1px solid var(--line);
}
.tc-app .tab {
  height: 34px; padding: 0 12px;
  display: inline-flex; align-items: center; gap: 6px;
  border-radius: var(--r-pill); border: 0; cursor: pointer;
  font-size: 12px; font-weight: 500;
  background: transparent; color: var(--text-3);
  transition: background .15s, color .15s;
}
.tc-app .tabs.tabs-sm .tab { height: 28px; padding: 0 10px; font-size: 11px; }
.tc-app .tab.tab-active {
  background: var(--bg-elev-2); color: var(--text);
  box-shadow: 0 1px 2px oklch(0 0 0 / 0.4), inset 0 0 0 1px var(--line);
}
.tc-app .tab-count {
  font-size: 10px; padding: 0 5px; border-radius: 999px;
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
}
.tc-app .tab.tab-active .tab-count { background: var(--accent-tint); color: var(--accent); }

/* ───── Progress bar ────────────────────────────────────────────────── */
.tc-app .progress {
  width: 100%; height: 4px; background: var(--bg-elev-2);
  border-radius: 999px; overflow: hidden; position: relative;
}
.tc-app .progress .progress-fill {
  height: 100%; background: var(--accent);
  transition: width .4s cubic-bezier(.2,.7,.3,1);
}
.tc-app .progress-warm .progress-fill { background: var(--warm); }
.tc-app .progress-ok   .progress-fill { background: var(--ok); }

/* ───── Kbd / KbdHint ───────────────────────────────────────────────── */
.tc-app .kbd-key {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 22px; height: 22px; padding: 0 6px;
  border-radius: var(--r-xs); font-size: 11px;
  background: var(--bg-elev-2); color: var(--text-2);
  border: 1px solid var(--line); box-shadow: 0 1px 0 oklch(0 0 0 / 0.3);
  font-family: var(--font-mono);
}
.tc-app .kbd-hint {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-3);
}
.tc-app .kbd-hint .kbd-sep { color: var(--text-dim); }
.tc-app .kbd-hint .kbd-label { margin-left: 2px; }

/* ───── Deck glyph ──────────────────────────────────────────────────── */
.tc-app .deck-glyph {
  width: 36px; height: 36px; border-radius: var(--r-sm);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-thai); font-weight: 600; line-height: 1; flex-shrink: 0;
  font-size: 20px;
  background: oklch(0.78 0.115 180 / 0.12);
  color: oklch(0.85 0.105 180);
  border: 1px solid oklch(0.78 0.115 180 / 0.2);
}
.tc-app .deck-glyph.dg-18 { width: 18px; height: 18px; font-size: 10px; }
.tc-app .deck-glyph.dg-20 { width: 20px; height: 20px; font-size: 11px; }
.tc-app .deck-glyph.dg-22 { width: 22px; height: 22px; font-size: 12px; }
.tc-app .deck-glyph.dg-36 { width: 36px; height: 36px; font-size: 20px; }
.tc-app .deck-glyph.dg-60 { width: 60px; height: 60px; font-size: 33px; }
.tc-app .deck-glyph.hue-180 { background: oklch(0.78 0.115 180 / 0.12); color: oklch(0.85 0.105 180); border-color: oklch(0.78 0.115 180 / 0.2); }
.tc-app .deck-glyph.hue-78  { background: oklch(0.83 0.095 78 / 0.12);  color: oklch(0.88 0.085 78);  border-color: oklch(0.83 0.095 78 / 0.2); }
.tc-app .deck-glyph.hue-230 { background: oklch(0.78 0.10 230 / 0.12);  color: oklch(0.85 0.09 230);  border-color: oklch(0.78 0.10 230 / 0.2); }
.tc-app .deck-glyph.hue-320 { background: oklch(0.78 0.10 320 / 0.12);  color: oklch(0.85 0.09 320);  border-color: oklch(0.78 0.10 320 / 0.2); }
.tc-app .deck-glyph.hue-20  { background: oklch(0.78 0.13 20 / 0.12);   color: oklch(0.85 0.12 20);   border-color: oklch(0.78 0.13 20 / 0.2); }
.tc-app .deck-glyph.hue-155 { background: oklch(0.78 0.13 155 / 0.12);  color: oklch(0.85 0.12 155);  border-color: oklch(0.78 0.13 155 / 0.2); }

/* ───── Toast ───────────────────────────────────────────────────────── */
.tc-app .toast {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--bg-elev-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  font-size: 13px;
  box-shadow: var(--sh-2);
}
.tc-app .toast .toast-icon { color: var(--accent); display: inline-flex; }
.tc-app .toast.toast-accent { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent-glow), var(--sh-2); }
.tc-app .toast.toast-warm   { border-color: var(--warm); box-shadow: 0 0 0 1px oklch(0.83 0.095 78 / 0.18), var(--sh-2); }

/* ───── PoS tag (part-of-speech) ────────────────────────────────────── */
.tc-app .pos {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--text-3);
  padding: 2px 6px; border-radius: var(--r-xs);
  background: var(--bg-elev-2); border: 1px solid var(--line);
}

/* ───── Popover ─────────────────────────────────────────────────────── */
.tc-app .popover {
  background: var(--bg-elev-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  padding: var(--pad-2);
  box-shadow: var(--sh-3);
  font-size: 13px;
}

/* ───── Stat ────────────────────────────────────────────────────────── */
.tc-app .stat { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.tc-app .stat .stat-value {
  font-family: var(--font-display); font-weight: 600; font-size: 22px;
  color: var(--text); line-height: 1; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.tc-app .stat .stat-label {
  font-size: 10px; color: var(--text-3);
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500;
}
.tc-app .stat.stat-sm .stat-value { font-size: 18px; }
.tc-app .stat.stat-lg .stat-value { font-size: 28px; }
.tc-app .stat.stat-lg .stat-label { font-size: 11px; }
.tc-app .stat.stat-accent .stat-value { color: var(--accent); }
.tc-app .stat.stat-warm   .stat-value { color: var(--warm); }
.tc-app .stat.stat-ok     .stat-value { color: var(--ok); }
.tc-app .stat.stat-err    .stat-value { color: var(--err); }

/* ───── Section header ──────────────────────────────────────────────── */
.tc-app .section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 12px;
}
.tc-app .section-head .section-kicker {
  font-size: 11px; color: var(--text-3); text-transform: uppercase;
  letter-spacing: 0.08em; font-weight: 500; margin-bottom: 4px;
}
.tc-app .section-head h3 { font-size: 16px; font-family: var(--font-display); }
.tc-app .section-link {
  font-size: 12px; color: var(--text-3); background: none; border: 0;
  cursor: pointer;
}

/* ───── Top bar ─────────────────────────────────────────────────────── */
.tc-app .topbar {
  height: 52px; display: flex; align-items: center; gap: 12px;
  padding: 0 var(--pad-3);
  border-bottom: 1px solid var(--line-soft);
  background: oklch(0.165 0.012 248 / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky; top: 0; z-index: 5;
}

/* ───── Wordmark ────────────────────────────────────────────────────── */
.tc-app .wordmark {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  letter-spacing: -0.02em; color: var(--text);
}
.tc-app .wordmark .wm-dot { color: var(--accent); }
.tc-app .logomark {
  width: 21px; height: 21px; border-radius: calc(var(--r-sm) - 1px);
  background: var(--accent-tint);
  border: 1px solid oklch(0.78 0.115 180 / 0.25);
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.tc-app .logomark .lm-thai {
  font-family: var(--font-thai); font-size: 13px;
  color: var(--accent); font-weight: 600; line-height: 1; margin-top: -1px;
}
.tc-app .ll-mark {
  width: 22px; height: 22px; border-radius: calc(var(--r-sm) - 1px);
  background: var(--ll-tint);
  border: 1px solid oklch(0.78 0.10 230 / 0.3);
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.tc-app .ll-mark svg { stroke: var(--ll); }

/* ───── Side nav (desktop) ──────────────────────────────────────────── */
.tc-app .sidenav {
  width: 240px; flex-shrink: 0; height: 100vh;
  border-right: 1px solid var(--line-soft);
  padding: 16px 12px; display: flex; flex-direction: column; gap: 18px;
  background: oklch(0.155 0.012 248);
  position: sticky; top: 0;
}
.tc-app .sidenav .sn-head { padding: 4px 8px; }
.tc-app .sidenav .sn-section {
  padding: 4px 10px; font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-dim); font-weight: 500;
}
.tc-app .sidenav .sn-list { display: flex; flex-direction: column; gap: 2px; }
.tc-app .sidenav .sn-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px;
  border-radius: var(--r-md); border: 0; cursor: pointer;
  background: transparent; color: var(--text-2);
  font-size: 13px; text-align: left;
  transition: background .15s;
  text-decoration: none;
}
.tc-app .sidenav .sn-item:hover { background: var(--bg-elev-0); }
.tc-app .sidenav .sn-item.sn-active {
  background: var(--bg-elev-1); color: var(--text); font-weight: 500;
}
.tc-app .sidenav .sn-item span { flex: 1; }
.tc-app .sidenav .sn-deck {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 10px; border-radius: var(--r-md); cursor: pointer;
  transition: background .15s;
  text-decoration: none;
}
.tc-app .sidenav .sn-deck:hover { background: var(--bg-elev-0); }
.tc-app .sidenav .sn-deck-name { flex: 1; font-size: 13px; color: var(--text-2); }
.tc-app .sidenav .sn-deck-due {
  font-size: 11px; color: var(--text-3);
  font-variant-numeric: tabular-nums;
}
.tc-app .sidenav .sn-foot {
  margin-top: auto;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-top: 1px solid var(--line-soft);
}
.tc-app .sidenav .sn-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--bg-elev-2);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-2); font-size: 12px; font-weight: 600;
}
.tc-app .sidenav .sn-user { flex: 1; min-width: 0; }
.tc-app .sidenav .sn-user-name { font-size: 12px; color: var(--text); font-weight: 500; }
.tc-app .sidenav .sn-user-tier { font-size: 10px; color: var(--text-dim); }

/* ───── Mobile nav (bottom) ─────────────────────────────────────────── */
.tc-app .mobnav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  height: 60px; display: flex;
  border-top: 1px solid var(--line-soft);
  background: oklch(0.165 0.012 248 / 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding-bottom: max(8px, env(safe-area-inset-bottom));
}
/* Reserve space so page content isn't hidden behind the fixed nav. */
@media (max-width: 768px) {
  .tc-app .app-shell-desktop > .main-col,
  .tc-app .app-shell-mobile { padding-bottom: calc(60px + env(safe-area-inset-bottom)); }
}
.tc-app .mobnav .mn-item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 3px; padding: 6px; border: 0; cursor: pointer;
  background: transparent;
  color: var(--text-3);
  text-decoration: none;
}
.tc-app .mobnav .mn-item.mn-active { color: var(--accent); }
.tc-app .mobnav .mn-label { font-size: 10px; font-weight: 500; }

/* ───── App shell layouts ───────────────────────────────────────────── */
.tc-app .app-shell-desktop {
  display: flex; min-height: 100vh;
}
.tc-app .app-shell-desktop > .main-col {
  flex: 1; display: flex; flex-direction: column; min-width: 0;
}
.tc-app .app-shell-mobile {
  display: flex; flex-direction: column; min-height: 100vh;
}

/* Hide side nav on mobile widths, hide mobile nav on desktop */
@media (max-width: 768px) {
  .tc-app .sidenav { display: none; }
  .tc-app .show-desktop { display: none !important; }
}
@media (min-width: 769px) {
  .tc-app .mobnav { display: none; }
  .tc-app .topbar.topbar-mobile-only { display: none; }
  .tc-app .show-mobile { display: none !important; }
}

/* ---- Mobile viewport lock (body.vp-lock pages) ----------------------------
   On phones the app interface locks to the screen: no document scrolling,
   topbar and mobnav always visible. Only the page's designated content
   region scrolls. word-explorer manages its own lock and does not use this. */
@media (max-width: 768px) {
  html:has(> body.vp-lock) { height: 100dvh; overflow: hidden; }
  body.vp-lock { height: 100dvh; overflow: hidden; margin: 0; }
  body.vp-lock .app-shell-desktop { height: 100dvh; min-height: 0; }
  body.vp-lock .main-col {
    height: 100dvh;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding-bottom: 0;
  }
  body.vp-lock .main-col > .topbar {
    flex: 0 0 auto;
    flex-wrap: wrap;
    row-gap: 6px;
    min-width: 0;
  }
  body.vp-lock .main-col > .topbar > * { min-width: 0; }
  /* Designated scroll regions (one per page) */
  body.vp-lock .main-col > .hm-container,
  body.vp-lock .main-col > .ly-body,
  body.vp-lock .main-col > .cv-shell,
  body.vp-lock .main-col > .settings-container {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding-bottom: calc(84px + env(safe-area-inset-bottom));
  }
  /* The interface never pans sideways; wide content must wrap or shrink. */
  body.vp-lock .main-col { overflow-x: hidden; }
  /* Flashcards: the study interface scales to fit; nothing scrolls */
  body.vp-lock .main-col > .fc-card-wrap { flex: 1 1 auto; min-height: 0; }
}