/* ================================================================
   TREE-DIAGRAM.CSS — Infographic Grammar Poster
   Poster-style rule board: soft-blue background, white row cards
   [icon] [subject chip] ⋯ [formula pill] │ [example]
   green Negative row, purple Question row, dashed 💡 tip banner.
   Grammar Strategies — Ayed Academy
   ================================================================ */

/* ── BOARD (soft blue poster) ── */
.tdx-board {
  margin: 1.5rem 0;
  background: #EAF1FA;
  border-radius: 24px;
  padding: 1.5rem 1.4rem 1.4rem;
  position: relative;
  overflow: hidden;
}
.tdx-board::after {
  /* leaf-like corner decoration */
  content: '❧';
  position: absolute;
  bottom: -12px;
  left: 6px;
  font-size: 3.2rem;
  color: rgba(63, 118, 210, 0.14);
  transform: rotate(-15deg);
  pointer-events: none;
}
body.dark-mode .tdx-board { background: var(--navy-mid); }

/* ── HEADER: big two-tone title + sparkle + flair ── */
.tdx-header {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.7rem;
  margin-bottom: 1.3rem;
}
.tdx-flair {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
  transform: rotate(-35deg);
}
.tdx-flair i {
  display: block;
  height: 3px;
  border-radius: 2px;
  background: var(--purple);
}
.tdx-flair i:nth-child(1) { width: 16px; }
.tdx-flair i:nth-child(2) { width: 10px; background: #2F6FE4; }
.tdx-flair i:nth-child(3) { width: 13px; }
.tdx-title-wrap { text-align: center; }
.tdx-title {
  font-family: var(--ff-en);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  color: #1E2A5E;
  letter-spacing: -0.01em;
  line-height: 1.15;
  position: relative;
  display: inline-block;
}
body.dark-mode .tdx-title { color: #fff; }
.tdx-title .accent { color: var(--purple); }
body.dark-mode .tdx-title .accent { color: #60A5FA; }
.tdx-spark {
  color: var(--gold);
  font-size: 0.55em;
  vertical-align: super;
  margin-left: 4px;
  animation: tdxTwinkle 2.2s ease-in-out infinite;
}
@keyframes tdxTwinkle {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.8); }
}
.tdx-title-underline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 6px;
}
.tdx-title-underline::before,
.tdx-title-underline::after {
  content: '';
  height: 3px;
  width: 70px;
  border-radius: 2px;
  background: var(--purple);
  opacity: 0.75;
}
.tdx-title-underline i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--purple);
}

/* ── ROWS ── */
.tdx-rows {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  direction: ltr;
}
.tdx-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: var(--surface);
  border-radius: 18px;
  padding: 0.85rem 1.1rem;
  box-shadow: 0 4px 14px rgba(30, 42, 94, 0.08);
}
body.dark-mode .tdx-row {
  background: var(--navy-soft);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}
.tdx-left {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 1.15;
  min-width: 0;
}
.tdx-right {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 1;
  min-width: 0;
}

/* Circle icon on the far left */
.tdx-badge {
  width: 42px;
  height: 42px;
  min-width: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  background: linear-gradient(135deg, #2F6FE4, #5A93F5);
  color: #fff;
  font-family: var(--ff-en);
  font-weight: 900;
  box-shadow: 0 3px 8px rgba(47, 111, 228, 0.35);
  border: 3px solid #fff;
}
body.dark-mode .tdx-badge { border-color: var(--navy-soft); }
.tdx-neg .tdx-badge {
  background: linear-gradient(135deg, #17A97B, #3ECBA0);
  box-shadow: 0 3px 8px rgba(23, 169, 123, 0.35);
  font-size: 1.5rem;
  line-height: 1;
}
.tdx-q .tdx-badge {
  background: linear-gradient(135deg, #6D3FE0, #9B6CF6);
  box-shadow: 0 3px 8px rgba(109, 63, 224, 0.35);
  font-size: 1.4rem;
}

/* Subject chip (light blue rounded box) */
.tdx-chip {
  background: #DCEBFB;
  color: #1E2A5E;
  border-radius: 14px;
  padding: 0.55rem 0.9rem;
  font-family: var(--ff-en);
  font-weight: 800;
  font-size: 0.95rem;
  text-align: center;
  line-height: 1.35;
  min-width: 105px;
  max-width: 170px;
}
.tdx-chip small {
  display: block;
  font-family: var(--ff-ar);
  font-size: 0.68rem;
  font-weight: 700;
  color: #5B6B94;
  margin-top: 1px;
}
body.dark-mode .tdx-chip { background: rgba(120, 168, 255, 0.16); color: #E6EEFF; }
body.dark-mode .tdx-chip small { color: rgba(230, 238, 255, 0.6); }
.tdx-neg .tdx-chip { background: #D9F4EA; color: #0B6B4D; }
.tdx-neg .tdx-chip small { color: #2E8F70; }
.tdx-q .tdx-chip { background: #EAE2FB; color: #4B2AA6; }
.tdx-q .tdx-chip small { color: #7A5BC9; }
body.dark-mode .tdx-neg .tdx-chip { background: rgba(62, 203, 160, 0.16); color: #8FF0CF; }
body.dark-mode .tdx-q .tdx-chip { background: rgba(155, 108, 246, 0.18); color: #CDB6FF; }

/* Dotted connector ····· */
.tdx-dots {
  flex: 1;
  min-width: 18px;
  max-width: 56px;
  border-top: 3px dotted #8FB2E8;
}
.tdx-dots-sm { max-width: 26px; min-width: 12px; }
body.dark-mode .tdx-dots { border-top-color: rgba(143, 178, 232, 0.4); }

/* Small auxiliary chip (do/does) */
.tdx-aux {
  background: var(--surface);
  border: 2px solid #DCEBFB;
  color: #1E2A5E;
  border-radius: 10px;
  padding: 0.3rem 0.65rem;
  font-family: var(--ff-en);
  font-weight: 800;
  font-size: 0.82rem;
  white-space: nowrap;
}
body.dark-mode .tdx-aux {
  background: transparent;
  border-color: rgba(143, 178, 232, 0.35);
  color: #E6EEFF;
}

/* Formula pill (cream) */
.tdx-pill {
  background: #FDF3D3;
  color: #1E2A5E;
  border-radius: 14px;
  padding: 0.55rem 1.1rem;
  font-family: var(--ff-en);
  font-weight: 800;
  font-size: 0.95rem;
  text-align: center;
  white-space: nowrap;
  box-shadow: inset 0 0 0 1.5px rgba(245, 166, 35, 0.25);
}
body.dark-mode .tdx-pill { background: rgba(245, 166, 35, 0.16); color: #FFE9B8; }
.tdx-pill .tdx-hl { color: var(--purple); }
body.dark-mode .tdx-pill .tdx-hl { color: #C4A5FF; }
.tdx-pill .tdx-plus { color: #8A93B5; font-weight: 700; padding: 0 2px; }

/* Vertical separator between formula and example */
.tdx-sep {
  width: 1.5px;
  align-self: stretch;
  background: #D6E2F2;
  border-radius: 2px;
}
body.dark-mode .tdx-sep { background: rgba(214, 226, 242, 0.15); }

/* Example icon (soft rounded square) */
.tdx-ex-icon {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  background: #E3EEFC;
}
.tdx-neg .tdx-ex-icon { background: #DFF5EC; }
.tdx-q .tdx-ex-icon { background: #EDE7FB; }
body.dark-mode .tdx-ex-icon { background: rgba(255, 255, 255, 0.07); }

/* Example sentence */
.tdx-ex-body { min-width: 0; }
.tdx-ex {
  font-family: var(--ff-en);
  font-weight: 600;
  font-size: 0.95rem;
  color: #2A3655;
  line-height: 1.5;
  text-align: left;
}
body.dark-mode .tdx-ex { color: #DDE6F5; }
.tdx-ex strong { color: var(--purple); font-weight: 900; }
body.dark-mode .tdx-ex strong { color: #C4A5FF; }
.tdx-ex em { font-style: normal; font-weight: 800; color: #1E2A5E; }
body.dark-mode .tdx-ex em { color: #fff; }
.tdx-note {
  direction: rtl;
  text-align: right;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 3px;
}
body.dark-mode .tdx-note { color: rgba(255, 255, 255, 0.55); }

/* ── TIP BANNER (dashed, light blue, 💡) ── */
.tdx-tip {
  margin-top: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: #DDEBFA;
  border: 2px dashed #7FA8E0;
  border-radius: 16px;
  padding: 0.8rem 1.1rem;
}
body.dark-mode .tdx-tip {
  background: rgba(127, 168, 224, 0.1);
  border-color: rgba(127, 168, 224, 0.45);
}
.tdx-tip-icon {
  width: 42px;
  height: 42px;
  min-width: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: linear-gradient(135deg, #2F6FE4, #5A93F5);
  box-shadow: 0 3px 8px rgba(47, 111, 228, 0.35);
}
.tdx-tip-text {
  flex: 1;
  font-weight: 700;
  font-size: 0.95rem;
  color: #1E2A5E;
  line-height: 1.8;
}
body.dark-mode .tdx-tip-text { color: #E6EEFF; }
.tdx-tip-text strong, .tdx-tip-text b { color: var(--purple); }
body.dark-mode .tdx-tip-text strong, body.dark-mode .tdx-tip-text b { color: #C4A5FF; }
.tdx-tip-pen { font-size: 1.2rem; opacity: 0.75; }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .tdx-row { flex-wrap: wrap; }
  .tdx-sep { display: none; }
  .tdx-left, .tdx-right { flex: 1 1 100%; }
  .tdx-right {
    padding-top: 0.6rem;
    margin-top: 0.15rem;
    border-top: 1.5px dashed #D6E2F2;
  }
  body.dark-mode .tdx-right { border-top-color: rgba(214, 226, 242, 0.15); }
}
@media (max-width: 480px) {
  .tdx-board { padding: 1.1rem 0.8rem 1rem; border-radius: 18px; }
  .tdx-left { flex-wrap: wrap; }
  .tdx-dots { display: none; }
  .tdx-pill { white-space: normal; }
  .tdx-chip { min-width: 90px; }
  .tdx-badge { width: 36px; height: 36px; min-width: 36px; }
}