/* ============================================================
   MIKA Academy — Duolingo-Style UI v68
   Clean, modern, gamified learning interface
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;700;900&display=swap');

:root {
  --mika-green:    #58CC02;
  --mika-green-dk: #46A302;
  --mika-blue:     #1CB0F6;
  --mika-blue-dk:  #1899D6;
  --mika-gold:     #FFD700;
  --mika-orange:   #FF9600;
  --mika-red:      #FF4B4B;
  --mika-purple:   #CE82FF;
  --mika-navy:     #1a1a2e;
  --mika-dark:     #16213e;
  --mika-card:     #ffffff;
  --mika-bg:       #f7f7f7;
  --mika-border:   #e5e5e5;
  --mika-text:     #3c3c3c;
  --mika-text-lt:  #777;
  --mika-radius:   16px;
  --mika-shadow:   0 4px 0 rgba(0,0,0,0.12);
  --mika-shadow-h: 0 2px 0 rgba(0,0,0,0.12);
  font-family: 'Cairo', Arial, sans-serif;
}

/* ── Reset & Base ── */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--mika-bg); color: var(--mika-text); font-family: 'Cairo', Arial, sans-serif; }

/* ============================================================
   TOP NAVIGATION BAR (Duolingo-style)
   ============================================================ */
.mika-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 2px solid var(--mika-border);
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.mika-topbar-logo {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--mika-navy);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.mika-topbar-stats {
  display: flex;
  align-items: center;
  gap: 20px;
}

.mika-stat-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 6px 14px;
  border-radius: 20px;
  background: #f0f0f0;
  cursor: default;
  transition: transform 0.15s;
}
.mika-stat-pill:hover { transform: scale(1.05); }
.mika-stat-pill.streak { background: #fff3e0; color: #e65100; }
.mika-stat-pill.xp     { background: #e8f5e9; color: #2e7d32; }
.mika-stat-pill.hearts { background: #fce4ec; color: #c62828; }
.mika-stat-pill .icon  { font-size: 1.1rem; }

/* ============================================================
   PROGRESS BAR (lesson progress)
   ============================================================ */
.mika-progress-wrap {
  background: var(--mika-border);
  border-radius: 20px;
  height: 16px;
  overflow: hidden;
  margin: 12px 0;
  position: relative;
}
.mika-progress-fill {
  height: 100%;
  border-radius: 20px;
  background: linear-gradient(90deg, var(--mika-green), #78e000);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}
.mika-progress-fill::after {
  content: '';
  position: absolute;
  top: 3px; right: 6px;
  width: 6px; height: 6px;
  background: rgba(255,255,255,0.6);
  border-radius: 50%;
}

/* ============================================================
   GRADE CARDS (home portal)
   ============================================================ */
.mika-grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.mika-grade-card {
  background: var(--mika-card);
  border-radius: var(--mika-radius);
  border: 2px solid var(--mika-border);
  padding: 20px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  box-shadow: var(--mika-shadow);
  position: relative;
  overflow: hidden;
}
.mika-grade-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 0 rgba(0,0,0,0.12);
  border-color: var(--mika-blue);
}
.mika-grade-card:active {
  transform: translateY(0);
  box-shadow: var(--mika-shadow-h);
}

.mika-grade-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.mika-grade-card-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}
.mika-grade-card-title {
  font-size: 1rem;
  font-weight: 900;
  color: var(--mika-navy);
  line-height: 1.3;
}
.mika-grade-card-sub {
  font-size: 0.78rem;
  color: var(--mika-text-lt);
  margin-top: 2px;
}

.mika-grade-card-progress {
  margin-top: 12px;
}
.mika-grade-card-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--mika-text-lt);
  margin-bottom: 6px;
}

/* Color themes per grade */
.mika-grade-card.primary   .mika-grade-card-icon { background: #e3f2fd; }
.mika-grade-card.prep      .mika-grade-card-icon { background: #e8f5e9; }
.mika-grade-card.secondary .mika-grade-card-icon { background: #fff3e0; }

/* ============================================================
   SUBJECT CARDS (inside a grade)
   ============================================================ */
.mika-subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  padding: 16px 20px;
  max-width: 900px;
  margin: 0 auto;
}

.mika-subject-card {
  background: var(--mika-card);
  border-radius: var(--mika-radius);
  border: 2px solid var(--mika-border);
  padding: 16px 12px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: var(--mika-shadow);
}
.mika-subject-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 0 rgba(0,0,0,0.1);
  border-color: var(--mika-green);
}
.mika-subject-card .subject-icon { font-size: 2.2rem; margin-bottom: 8px; }
.mika-subject-card .subject-name { font-size: 0.88rem; font-weight: 700; color: var(--mika-navy); }
.mika-subject-card .subject-progress {
  font-size: 0.72rem;
  color: var(--mika-green-dk);
  font-weight: 700;
  margin-top: 4px;
}

/* ============================================================
   LESSON PATH (Duolingo skill tree style)
   ============================================================ */
.mika-lesson-path {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.mika-lesson-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  width: 100%;
  margin-bottom: 8px;
}

.mika-lesson-node::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--mika-border);
}
.mika-lesson-node:first-child::before { display: none; }

.mika-lesson-btn {
  width: 80px; height: 80px;
  border-radius: 50%;
  border: 4px solid transparent;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 1.8rem;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 6px 0 rgba(0,0,0,0.15);
  position: relative;
}
.mika-lesson-btn:hover { transform: scale(1.08); }
.mika-lesson-btn:active { transform: scale(0.96); box-shadow: 0 2px 0 rgba(0,0,0,0.15); }

.mika-lesson-btn.completed { background: var(--mika-green); border-color: var(--mika-green-dk); }
.mika-lesson-btn.active    { background: var(--mika-blue);  border-color: var(--mika-blue-dk); animation: pulse-btn 2s infinite; }
.mika-lesson-btn.locked    { background: #e5e5e5; border-color: #ccc; cursor: not-allowed; filter: grayscale(1); }

@keyframes pulse-btn {
  0%, 100% { box-shadow: 0 6px 0 rgba(0,0,0,0.15); }
  50%       { box-shadow: 0 6px 0 rgba(28,176,246,0.5), 0 0 20px rgba(28,176,246,0.3); }
}

.mika-lesson-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--mika-text);
  margin-top: 6px;
  text-align: center;
  max-width: 100px;
}

/* ============================================================
   QUESTION SCREEN (Duolingo-style)
   ============================================================ */
.mika-question-screen {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.mika-question-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.mika-close-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: #f0f0f0;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
  flex-shrink: 0;
}
.mika-close-btn:hover { background: #e0e0e0; }

.mika-question-progress {
  flex: 1;
}

.mika-hearts-display {
  display: flex;
  gap: 4px;
}
.mika-heart { font-size: 1.2rem; transition: transform 0.3s; }
.mika-heart.lost { filter: grayscale(1); opacity: 0.4; transform: scale(0.8); }

/* Question card */
.mika-question-card {
  background: var(--mika-card);
  border-radius: var(--mika-radius);
  border: 2px solid var(--mika-border);
  padding: 28px 24px;
  margin-bottom: 24px;
  box-shadow: var(--mika-shadow);
}

.mika-question-type-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--mika-blue);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.mika-question-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--mika-navy);
  line-height: 1.6;
  direction: rtl;
  text-align: right;
}

/* Answer choices */
.mika-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.mika-choice-btn {
  background: var(--mika-card);
  border: 2px solid var(--mika-border);
  border-radius: var(--mika-radius);
  padding: 16px 20px;
  text-align: right;
  direction: rtl;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Cairo', Arial, sans-serif;
  color: var(--mika-text);
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  box-shadow: var(--mika-shadow);
  display: flex;
  align-items: center;
  gap: 12px;
}
.mika-choice-btn:hover:not(:disabled) {
  border-color: var(--mika-blue);
  background: #e8f7ff;
  transform: translateX(-2px);
}
.mika-choice-btn.selected {
  border-color: var(--mika-blue);
  background: #e8f7ff;
}
.mika-choice-btn.correct {
  border-color: var(--mika-green);
  background: #e9f7e0;
  color: var(--mika-green-dk);
}
.mika-choice-btn.wrong {
  border-color: var(--mika-red);
  background: #ffeaea;
  color: var(--mika-red);
  animation: shake 0.4s;
}
.mika-choice-btn:disabled { cursor: default; }

.mika-choice-letter {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--mika-border);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900;
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: background 0.15s;
}
.mika-choice-btn.correct .mika-choice-letter { background: var(--mika-green); color: #fff; }
.mika-choice-btn.wrong   .mika-choice-letter { background: var(--mika-red);   color: #fff; }
.mika-choice-btn.selected .mika-choice-letter { background: var(--mika-blue); color: #fff; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-8px); }
  75%       { transform: translateX(8px); }
}

/* Feedback banner */
.mika-feedback-banner {
  border-radius: var(--mika-radius);
  padding: 16px 20px;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: slideUp 0.3s ease;
}
.mika-feedback-banner.correct {
  background: #d7f5b1;
  border: 2px solid var(--mika-green);
  color: #2d6a00;
}
.mika-feedback-banner.wrong {
  background: #ffd7d7;
  border: 2px solid var(--mika-red);
  color: #7b0000;
}
.mika-feedback-icon { font-size: 1.6rem; flex-shrink: 0; }
.mika-feedback-title { font-weight: 900; font-size: 1rem; margin-bottom: 2px; }
.mika-feedback-text  { font-size: 0.85rem; line-height: 1.5; }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Action button */
.mika-action-btn {
  width: 100%;
  padding: 16px;
  border-radius: var(--mika-radius);
  border: none;
  font-size: 1rem;
  font-weight: 900;
  font-family: 'Cairo', Arial, sans-serif;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 0 5px 0 rgba(0,0,0,0.2);
  letter-spacing: 0.3px;
}
.mika-action-btn:active { transform: translateY(3px); box-shadow: 0 2px 0 rgba(0,0,0,0.2); }
.mika-action-btn.primary { background: var(--mika-green); color: #fff; }
.mika-action-btn.primary:hover { background: var(--mika-green-dk); }
.mika-action-btn.secondary { background: #f0f0f0; color: var(--mika-text); }
.mika-action-btn.secondary:hover { background: #e0e0e0; }
.mika-action-btn:disabled { background: #e0e0e0; color: #aaa; cursor: not-allowed; box-shadow: none; }

/* ============================================================
   LESSON COMPLETE SCREEN
   ============================================================ */
.mika-complete-screen {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.mika-complete-trophy {
  font-size: 5rem;
  margin-bottom: 16px;
  animation: bounce 0.6s ease;
}

.mika-complete-title {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--mika-navy);
  margin-bottom: 8px;
}

.mika-complete-subtitle {
  font-size: 1rem;
  color: var(--mika-text-lt);
  margin-bottom: 32px;
}

.mika-complete-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.mika-complete-stat {
  background: var(--mika-card);
  border-radius: var(--mika-radius);
  border: 2px solid var(--mika-border);
  padding: 16px 8px;
  box-shadow: var(--mika-shadow);
}
.mika-complete-stat .stat-value {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--mika-navy);
}
.mika-complete-stat .stat-label {
  font-size: 0.75rem;
  color: var(--mika-text-lt);
  margin-top: 2px;
}
.mika-complete-stat.xp-stat    .stat-value { color: var(--mika-green); }
.mika-complete-stat.score-stat .stat-value { color: var(--mika-blue); }
.mika-complete-stat.time-stat  .stat-value { color: var(--mika-orange); }

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40%       { transform: translateY(-20px); }
  60%       { transform: translateY(-10px); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   XP NOTIFICATION (floating)
   ============================================================ */
.mika-xp-popup {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--mika-green);
  color: #fff;
  font-weight: 900;
  font-size: 1rem;
  padding: 10px 18px;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(88,204,2,0.4);
  z-index: 999;
  animation: xpPop 2s forwards;
  pointer-events: none;
}

@keyframes xpPop {
  0%   { opacity: 0; transform: translateY(10px) scale(0.8); }
  20%  { opacity: 1; transform: translateY(0) scale(1.1); }
  40%  { transform: scale(1); }
  70%  { opacity: 1; }
  100% { opacity: 0; transform: translateY(-30px); }
}

/* ============================================================
   STREAK NOTIFICATION
   ============================================================ */
.mika-streak-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 24px;
  padding: 32px 40px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  z-index: 1000;
  animation: popIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.mika-streak-popup .streak-fire { font-size: 4rem; margin-bottom: 8px; }
.mika-streak-popup .streak-number { font-size: 3rem; font-weight: 900; color: var(--mika-orange); }
.mika-streak-popup .streak-label { font-size: 1rem; color: var(--mika-text-lt); margin-top: 4px; }

@keyframes popIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ============================================================
   FLASHCARD COMPONENT
   ============================================================ */
.mika-flashcard-wrap {
  perspective: 1000px;
  max-width: 500px;
  margin: 20px auto;
  height: 220px;
  cursor: pointer;
}

.mika-flashcard {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.mika-flashcard.flipped { transform: rotateY(180deg); }

.mika-flashcard-front,
.mika-flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--mika-radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  box-shadow: var(--mika-shadow);
}

.mika-flashcard-front {
  background: var(--mika-navy);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.1);
}

.mika-flashcard-back {
  background: var(--mika-green);
  color: #fff;
  transform: rotateY(180deg);
}

.mika-flashcard-front .card-label { font-size: 0.75rem; opacity: 0.6; margin-bottom: 12px; }
.mika-flashcard-front .card-text  { font-size: 1.2rem; font-weight: 700; line-height: 1.5; }
.mika-flashcard-back  .card-text  { font-size: 1.1rem; font-weight: 700; line-height: 1.6; }
.mika-flashcard-front .card-hint  { font-size: 0.75rem; opacity: 0.5; margin-top: 16px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
  .mika-grade-grid    { grid-template-columns: 1fr; padding: 12px; }
  .mika-subject-grid  { grid-template-columns: repeat(2, 1fr); padding: 12px; }
  .mika-question-card { padding: 20px 16px; }
  .mika-topbar-stats  { gap: 10px; }
  .mika-stat-pill     { padding: 5px 10px; font-size: 0.85rem; }
  .mika-complete-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
}

/* ============================================================
   DARK MODE SUPPORT
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --mika-bg:     #111827;
    --mika-card:   #1f2937;
    --mika-border: #374151;
    --mika-text:   #f3f4f6;
    --mika-text-lt:#9ca3af;
  }
  .mika-topbar { background: #1f2937; border-color: #374151; }
  .mika-choice-btn { background: #1f2937; color: #f3f4f6; }
  .mika-choice-btn:hover:not(:disabled) { background: #1e3a5f; }
}