/* ==========================================================================
   BASIC MATH PRACTICE — STEP-BY-STEP STYLES (style.css)
   Token-based styles for untimed learning, operation tabs, hint card & tutor.
   ========================================================================== */
.practice-container {
  max-width: 580px; margin: 0 auto; display: flex;
  flex-direction: column; gap: var(--space-4);
}
/* Operation Filter Tabs */
.operation-tabs {
  display: flex; align-items: center; justify-content: center;
  gap: var(--space-2); flex-wrap: wrap;
}
.op-tab-btn {
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); font-size: var(--text-sm);
  font-weight: 700; background: var(--surface); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; transition: all var(--duration-fast) ease;
}
.op-tab-btn:hover { background: var(--surface-hover); color: var(--text); }
.op-tab-btn.active {
  background: var(--secondary); border-color: var(--secondary); color: var(--text);
  box-shadow: 0 0 12px var(--secondary-glow);
}
/* Equation Card */
.practice-equation-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-4); text-align: center; box-shadow: var(--shadow-md);
  position: relative;
}
.practice-equation {
  font-family: var(--font-mono); font-size: clamp(2.25rem, 8vw, 3.5rem); font-weight: 900;
  color: var(--text);
}
.practice-equation .operator { color: var(--accent); }
/* 2x2 Answer Grid */
.practice-choices-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3);
  margin-top: var(--space-2);
}
.practice-choice-btn {
  background: var(--surface); border: 2px solid var(--border); border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-2); font-family: var(--font-mono); font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 800; color: var(--text); cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out); min-height: 68px; touch-action: manipulation;
}
.practice-choice-btn:hover:not(:disabled) { background: var(--surface-hover); border-color: var(--primary); transform: translateY(-2px); }
.practice-choice-btn.correct {
  background: var(--success) !important; border-color: var(--success) !important; color: var(--text) !important;
  box-shadow: 0 0 16px var(--success-glow);
}
.practice-choice-btn.wrong {
  background: var(--danger) !important; border-color: var(--danger) !important; color: var(--text) !important;
  animation: shake 0.35s ease;
}
/* Step-by-Step Hint Card */
.hint-card {
  background: linear-gradient(135deg, #1E1B4B 0%, #162032 100%); border: 1px solid var(--primary); border-radius: var(--radius-xl);
  padding: var(--space-5); box-shadow: var(--shadow-lg); display: none;
  animation: slideDown 0.3s var(--ease-out);
}
.hint-card.active { display: block; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.hint-header {
  display: flex; align-items: center; gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.hint-icon { font-size: 1.5rem; }
.hint-title { font-size: var(--text-lg); font-weight: 800; color: var(--accent); }
.hint-step-list {
  list-style: none; display: flex; flex-direction: column;
  gap: var(--space-3); margin-bottom: var(--space-5);
}
.hint-step-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  background: rgba(15, 23, 42, 0.6); padding: var(--space-3); border-radius: var(--radius-md);
  font-size: var(--text-sm); color: var(--text); line-height: 1.5;
}
.step-badge {
  background: var(--primary); color: var(--text); font-family: var(--font-mono);
  font-size: var(--text-xs); font-weight: 800; width: 22px;
  height: 22px; border-radius: var(--radius-full); display: inline-flex;
  align-items: center; justify-content: center; flex-shrink: 0;
}
.btn-hint-next { width: 100%; }
/* TTS Speaker Buttons */
.btn-tts {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 4px 12px; background: var(--surface-alt); border: 1px solid var(--border);
  border-radius: var(--radius-full); font-size: var(--text-xs); color: var(--text-muted);
  cursor: pointer; transition: all var(--duration-fast) ease;
}
.btn-tts:hover { background: var(--surface-hover); color: var(--text); border-color: var(--primary); }
.btn-tts.speaking {
  background: var(--primary); color: var(--text); box-shadow: 0 0 12px var(--primary-glow);
  animation: soundPulse 0.9s infinite alternate ease-in-out;
}
@keyframes soundPulse { 0% { transform: scale(1); }
  100% { transform: scale(1.08); }
}
/* Visual Model Box & Scaffolds */
.visual-model-card {
  background: rgba(15, 23, 42, 0.7); border: 1px dashed var(--border); border-radius: var(--radius-lg);
  padding: var(--space-4); margin-bottom: var(--space-4); text-align: center;
}
.visual-model-label {
  font-size: var(--text-xs); color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 0.5px; margin-bottom: var(--space-3); display: block;
}
.cancellation-wrapper {
  display: flex; flex-direction: column; align-items: center;
  gap: var(--space-3);
}
/* Formula Summary Status Pill */
.visual-status-pill {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--surface); border: 1px solid var(--border); padding: 4px 14px;
  border-radius: var(--radius-full); font-family: var(--font-mono); font-size: var(--text-xs);
  font-weight: 700;
}
.pill-total { color: var(--text); }
.pill-op { color: var(--accent); font-weight: 900; }
.pill-sub { color: var(--danger); }
.pill-rem { color: var(--secondary); font-weight: 800; }
/* Subtraction: Dot Cancellation Grid */
.cancellation-dots-grid {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px; max-width: 320px;
}
.sub-dot {
  width: 32px; height: 32px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 800; font-family: var(--font-mono);
}
.sub-dot.active {
  background: rgba(16, 185, 129, 0.15); border: 2px solid var(--secondary); color: var(--secondary);
  box-shadow: 0 0 8px var(--secondary-glow);
}
.sub-dot.crossed {
  background: rgba(239, 68, 68, 0.12); border: 2px dashed var(--danger); color: var(--danger);
  position: relative; opacity: 0.7;
}
.sub-dot.crossed::after {
  content: "✕"; position: absolute; font-size: 14px;
  color: var(--danger); font-weight: 900;
}
.cancellation-legend {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: var(--space-3); font-size: var(--text-xs); font-weight: 700;
  margin-top: 2px;
}
.cancellation-legend .leg-active { color: var(--secondary); }
.cancellation-legend .leg-crossed { color: var(--danger); }
/* Addition: Ten Frames */
.ten-frames-container {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: var(--space-3);
}
.ten-frame {
  display: grid; grid-template-columns: repeat(5, 1fr); grid-template-rows: repeat(2, 1fr);
  gap: 4px; background: rgba(15, 23, 42, 0.8); border: 2px solid var(--border);
  border-radius: var(--radius-md); padding: 6px; width: 140px;
}
.tf-slot { aspect-ratio: 1; border: 1px dashed var(--border); border-radius: 4px; }
.tf-slot.filled-a { background: var(--primary); border: none; box-shadow: 0 0 6px var(--primary-glow); }
.tf-slot.filled-b { background: var(--accent); border: none; box-shadow: 0 0 6px var(--accent-glow); }
/* Multiplication: Array Matrix */
.array-grid-container {
  display: inline-grid; gap: 4px; background: rgba(15, 23, 42, 0.6);
  padding: var(--space-2); border-radius: var(--radius-md); margin: 0 auto;
}
.array-cell {
  width: 26px; height: 26px; border-radius: 4px;
  background: rgba(99, 102, 241, 0.25); border: 1px solid var(--primary); display: flex;
  align-items: center; justify-content: center; font-size: 10px;
  font-family: var(--font-mono); color: var(--text); font-weight: 700;
}
/* Division: Sharing Baskets */
.sharing-baskets-wrapper {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: var(--space-2);
}
.sharing-basket {
  background: rgba(30, 41, 59, 0.9); border: 1px solid var(--border-focus); border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3); min-width: 75px; text-align: center;
}
.basket-title {
  font-size: 10px; color: var(--text-muted); text-transform: uppercase;
  font-weight: 700;
}
.basket-items {
  display: flex; justify-content: center; gap: 3px;
  margin: 4px 0;
}
.basket-counter {
  width: 10px; height: 10px; border-radius: var(--radius-full);
  background: var(--secondary); box-shadow: 0 0 6px var(--secondary-glow);
}
.basket-badge { font-size: 11px; font-weight: 800; color: var(--secondary); }
/* Tutor Angka: Decomposition Scaffold */
.tutor-scaffold {
  margin-top: var(--space-3); background: rgba(15, 23, 42, 0.7); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: var(--space-3); width: 100%;
  max-width: 320px;
}
.tutor-badge {
  font-size: var(--text-xs); font-weight: 800; color: var(--accent);
  text-align: center; margin-bottom: var(--space-2);
}
.tutor-tree { display: flex; flex-direction: column; align-items: center; }
.tutor-root-val {
  font-size: var(--text-xl); font-weight: 900; font-family: var(--font-mono);
  color: var(--text);
}
.tutor-leaves { display: flex; gap: var(--space-3); margin: var(--space-2) 0; }
.tutor-leaf {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 6px 10px; text-align: center;
}
.leaf-label {
  font-size: 9px; color: var(--text-muted); text-transform: uppercase;
  display: block;
}
.leaf-num {
  font-size: var(--text-base); font-weight: 800; font-family: var(--font-mono);
  display: block;
}
.leaf-ten .leaf-num { color: var(--primary); }
.leaf-ones .leaf-num { color: var(--accent); }
.leaf-calc { font-size: 10px; color: var(--text-muted); margin-top: 2px; }
.tutor-recombine-pill {
  background: rgba(34, 197, 94, 0.15); border: 1px solid var(--success); padding: 4px 12px;
  border-radius: var(--radius-full); font-size: 11px; color: var(--text);
  font-weight: 700; margin-top: var(--space-1);
}
.tutor-final-val {
  color: var(--success); font-size: var(--text-sm); font-weight: 900;
  margin-left: 3px;
}
/* Number Line Card */
.number-line-card {
  background: rgba(15, 23, 42, 0.7); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: var(--space-3); width: 100%; max-width: 330px;
}
.nl-label { font-size: 11px; font-weight: 800; color: var(--danger); text-align: center; margin-bottom: 4px; }
.number-line-svg { width: 100%; height: auto; display: block; }
/* 2-Digit Addition: Dual Decomposition Tree */
.dual-decomp-grid {
  display: flex; align-items: center; justify-content: center; gap: var(--space-2); margin: var(--space-2) 0;
}
.decomp-branch {
  display: flex; flex-direction: column; align-items: center; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-md); padding: 6px 12px;
}
.decomp-num { font-size: var(--text-lg); font-weight: 900; font-family: var(--font-mono); color: var(--text); }
.decomp-tags { display: flex; gap: 6px; margin-top: 2px; }
.tag-tens {
  background: rgba(99, 102, 241, 0.2); border: 1px solid var(--primary); color: var(--primary);
  border-radius: 4px; padding: 2px 6px; font-size: 10px; font-weight: 800; font-family: var(--font-mono);
}
.tag-ones {
  background: rgba(245, 158, 11, 0.2); border: 1px solid var(--accent); color: var(--accent);
  border-radius: 4px; padding: 2px 6px; font-size: 10px; font-weight: 800; font-family: var(--font-mono);
}
.decomp-op-sign { font-size: var(--text-xl); font-weight: 900; color: var(--accent); }
.decomp-sub-steps { display: flex; flex-direction: column; gap: 4px; margin: var(--space-2) 0; width: 100%; }
.sub-step-row {
  background: rgba(15, 23, 42, 0.6); padding: 4px 10px; border-radius: 4px;
  font-size: 11px; color: var(--text); display: flex; align-items: center; gap: 6px;
}
/* Multiplication: Split Area Model (Friendly 5s) */
.split-area-blocks {
  display: flex; align-items: center; justify-content: center; gap: var(--space-2);
  margin: var(--space-2) 0; width: 100%;
}
.area-block {
  border-radius: var(--radius-md); padding: 8px 14px; text-align: center;
  display: flex; flex-direction: column; gap: 2px; flex: 1;
}
.area-block span { font-size: 11px; font-weight: 700; color: var(--text-muted); }
.area-block strong { font-size: var(--text-lg); font-family: var(--font-mono); }
.block-five { background: rgba(16, 185, 129, 0.15); border: 2px solid var(--secondary); color: var(--secondary); }
.block-rem { background: rgba(245, 158, 11, 0.15); border: 2px solid var(--accent); color: var(--accent); }
.area-plus { font-size: var(--text-xl); font-weight: 900; color: var(--accent); }
/* Multiplication: Skip Counting Steps Card */
.skip-count-card {
  background: rgba(15, 23, 42, 0.7); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: var(--space-3); width: 100%; max-width: 340px;
}
.skip-pill-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 6px;
}
.skip-pill {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-full);
  padding: 3px 10px; display: inline-flex; align-items: center; gap: 4px; font-family: var(--font-mono);
}
.sp-step { font-size: 9px; color: var(--text-muted); font-weight: 700; }
.sp-val { font-size: 11px; font-weight: 800; color: var(--text); }
.skip-pill.final {
  background: rgba(34, 197, 94, 0.2); border-color: var(--success);
  box-shadow: 0 0 10px var(--success-glow);
}
.skip-pill.final .sp-val { color: var(--success); font-size: 13px; }
/* Magic 9s Finger Trick */
.finger-trick-card {
  background: rgba(15, 23, 42, 0.7); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: var(--space-3); width: 100%; max-width: 350px;
}
.hands-wrapper { display: flex; flex-direction: column; gap: var(--space-2); margin: var(--space-2) 0; }
.hand-box {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 6px; text-align: center;
}
.hand-title { font-size: 10px; font-weight: 700; color: var(--text-muted); display: block; margin-bottom: 4px; }
.fingers-row { display: flex; justify-content: center; gap: 4px; }
.finger-item {
  width: 48px; padding: 4px 2px; border-radius: 6px; border: 1px solid var(--border);
  display: flex; flex-direction: column; align-items: center; gap: 1px; font-family: var(--font-mono);
}
.finger-icon { font-size: 14px; line-height: 1; }
.finger-num { font-size: 11px; font-weight: 900; }
.finger-role { font-size: 8px; font-weight: 700; text-transform: uppercase; }
.finger-tens { background: rgba(99, 102, 241, 0.15); border-color: var(--primary); color: var(--primary); }
.finger-ones { background: rgba(245, 158, 11, 0.15); border-color: var(--accent); color: var(--accent); }
.finger-folded {
  background: rgba(239, 68, 68, 0.15); border: 2px dashed var(--danger); color: var(--danger);
  transform: translateY(3px) scale(0.93); opacity: 0.85;
}
.finger-legend-row { display: flex; gap: 6px; margin: var(--space-2) 0; justify-content: center; }
.f-leg-card {
  background: rgba(15, 23, 42, 0.6); padding: 4px 8px; border-radius: 4px; font-size: 10px; color: var(--text);
  flex: 1; text-align: center;
}
.f-leg-dir { display: block; font-size: 9px; color: var(--text-muted); font-weight: 700; }
.leg-tens-card strong { color: var(--primary); }
.leg-ones-card strong { color: var(--accent); }

/* Multiplication: Group Trays (Small Numbers <= 5) */
.group-trays-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 6px; }
.group-tray {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 6px 10px; text-align: center; min-width: 65px;
}
.tray-title { font-size: 9px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; display: block; }
.tray-dots { display: flex; justify-content: center; gap: 3px; margin: 4px 0; }
.tray-dot { width: 10px; height: 10px; border-radius: var(--radius-full); background: var(--accent); box-shadow: 0 0 6px var(--accent-glow); }
.tray-count { font-size: 11px; font-weight: 800; color: var(--accent); font-family: var(--font-mono); }

/* Step-by-Step Flow Enhancements */
.hint-step-item.step-final {
  background: rgba(34, 197, 94, 0.12); border-left: 3px solid var(--success);
}
.step-badge.badge-gold { background: var(--accent); box-shadow: 0 0 10px var(--accent-glow); }
.step-formula { color: var(--accent); font-family: var(--font-mono); font-weight: 800; }