/* ============================================
   C++ АКАДЕМІЯ — COMPONENTS CSS
   ============================================ */

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity 0.2s;
}
.btn:hover::after { opacity: 1; }

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99,102,241,0.55);
}

.btn-outline {
  background: transparent;
  color: var(--accent-blue);
  border: 1.5px solid var(--accent-blue);
}
.btn-outline:hover {
  background: rgba(99,102,241,0.12);
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}
.btn-ghost:hover {
  background: var(--bg-glass-hover);
}

.btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  box-shadow: 0 4px 20px rgba(16,185,129,0.4);
}
.btn-success:hover { transform: translateY(-2px); }

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
}

.btn-sm { padding: 0.45rem 1rem; font-size: 0.85rem; }
.btn-lg { padding: 0.9rem 2rem; font-size: 1.05rem; }
.btn-xl { padding: 1.1rem 2.5rem; font-size: 1.1rem; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ---- CARDS ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card:hover {
  border-color: var(--border-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.card-glass {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.card-gradient {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
}

/* ---- LESSON CARD ---- */
.lesson-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.lesson-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity 0.2s;
}
.lesson-card:hover { border-color: var(--border-color); transform: translateX(4px); }
.lesson-card:hover::before { opacity: 1; }
.lesson-card.completed { border-color: rgba(16,185,129,0.3); }
.lesson-card.completed::before { opacity: 1; background: var(--accent-green); }
.lesson-card.locked { opacity: 0.5; cursor: default; }
.lesson-card.locked:hover { transform: none; }

.lesson-card-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.lesson-card-body { flex: 1; min-width: 0; }
.lesson-card-title { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.2rem; }
.lesson-card-meta  { font-size: 0.78rem; color: var(--text-muted); display: flex; gap: 0.75rem; align-items: center; }
.lesson-card-xp    { font-size: 0.75rem; font-weight: 700; color: var(--accent-orange); background: rgba(245,158,11,0.1); padding: 0.15rem 0.5rem; border-radius: var(--radius-full); }

/* ---- BADGES ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
}
.badge-blue    { background: rgba(99,102,241,0.15); color: var(--accent-blue); border: 1px solid rgba(99,102,241,0.25); }
.badge-green   { background: rgba(16,185,129,0.12); color: var(--accent-green); border: 1px solid rgba(16,185,129,0.25); }
.badge-orange  { background: rgba(245,158,11,0.12); color: var(--accent-orange); border: 1px solid rgba(245,158,11,0.25); }
.badge-purple  { background: rgba(139,92,246,0.12); color: var(--accent-purple); border: 1px solid rgba(139,92,246,0.25); }
.badge-red     { background: rgba(239,68,68,0.12); color: var(--accent-red); border: 1px solid rgba(239,68,68,0.25); }

/* ---- LEVEL BADGES ---- */
.level-badge-beginner     { background: rgba(16,185,129,0.12); color: var(--accent-green); }
.level-badge-intermediate { background: rgba(245,158,11,0.12); color: var(--accent-orange); }
.level-badge-oop          { background: rgba(99,102,241,0.15); color: var(--accent-blue); }
.level-badge-advanced     { background: rgba(139,92,246,0.12); color: var(--accent-purple); }

/* ---- PROGRESS BAR ---- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--gradient-btn);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}
.progress-fill::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 1.5s infinite;
  background-size: 200% auto;
}

.progress-bar-lg  { height: 12px; }
.progress-bar-xl  { height: 16px; }

/* ---- CODE BLOCK ---- */
.code-block {
  background: #0a0b14;
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.7;
  color: #e4e8f0;
  overflow-x: auto;
  position: relative;
}
[data-theme="light"] .code-block {
  background: #1e2040;
  color: #e4e8f0;
}

.code-block .hl-keyword   { color: #c792ea; }
.code-block .hl-string    { color: #c3e88d; }
.code-block .hl-comment   { color: #546e7a; font-style: italic; }
.code-block .hl-number    { color: #f78c6c; }
.code-block .hl-function  { color: #82aaff; }
.code-block .hl-type      { color: #ffcb6b; }
.code-block .hl-operator  { color: #89ddff; }
.code-block .hl-include   { color: #f07178; }

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 1.25rem;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid rgba(99,102,241,0.2);
  border-bottom: none;
}
.code-header + .code-block {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}
.code-dots { display: flex; gap: 0.4rem; }
.code-dot  { width: 12px; height: 12px; border-radius: 50%; }
.code-dot:nth-child(1) { background: #ef4444; }
.code-dot:nth-child(2) { background: #f59e0b; }
.code-dot:nth-child(3) { background: #10b981; }
.code-lang { font-size: 0.78rem; color: var(--text-muted); font-family: var(--font-code); }
.code-copy { font-size: 0.78rem; color: var(--text-muted); cursor: pointer; transition: color 0.2s; }
.code-copy:hover { color: var(--accent-blue); }

/* ---- CODE EDITOR (legacy textarea) ---- */
.code-editor-wrapper {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.code-editor-header {
  background: #0a0b14;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(99,102,241,0.15);
}
.code-editor-textarea {
  width: 100%;
  min-height: 220px;
  background: #0d0e1a;
  color: var(--text-code);
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.7;
  padding: 1.25rem 1.5rem;
  border: none;
  outline: none;
  resize: vertical;
  caret-color: var(--accent-blue);
}
.code-editor-textarea::placeholder { color: var(--text-muted); }
.code-output {
  background: #070810;
  border-top: 1px solid rgba(99,102,241,0.15);
  padding: 1rem 1.5rem;
  font-family: var(--font-code);
  font-size: 0.875rem;
  min-height: 80px;
  color: var(--accent-green);
  white-space: pre-wrap;
  word-break: break-word;
}
.output-error   { color: var(--accent-red); }
.output-hint    { color: var(--accent-orange); }
.output-success { color: var(--accent-green); }

/* ---- MONACO EDITOR WRAPPER ---- */
.monaco-editor-wrapper {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: #12142a;
}
.monaco-editor-header {
  background: #0a0b14;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid rgba(99,102,241,0.15);
}
.monaco-container {
  width: 100%;
  min-height: 200px;
}
.monaco-container .monaco-editor {
  border-radius: 0;
}
.monaco-status {
  margin-left: auto;
  font-size: 0.72rem;
  font-family: var(--font-code);
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
[data-theme="light"] .monaco-editor-wrapper {
  background: #f8f9ff;
}
[data-theme="light"] .monaco-editor-header {
  background: #e8eaf5;
  border-bottom-color: rgba(99,102,241,0.15);
}
.monaco-editor-wrapper .code-output {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* ---- QUIZ OPTION ---- */
.quiz-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-glass);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  color: var(--text-primary);
}
.quiz-option:hover {
  border-color: var(--accent-blue);
  background: rgba(99,102,241,0.08);
}
.quiz-option.correct  { border-color: var(--accent-green); background: rgba(16,185,129,0.1); }
.quiz-option.wrong    { border-color: var(--accent-red); background: rgba(239,68,68,0.1); }

.quiz-letter {
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem;
  flex-shrink: 0;
  transition: var(--transition);
}
.quiz-option:hover .quiz-letter { background: var(--accent-blue); color: #fff; }
.quiz-option.correct .quiz-letter { background: var(--accent-green); color: #fff; }
.quiz-option.wrong .quiz-letter   { background: var(--accent-red); color: #fff; }

/* ---- ACHIEVEMENT BADGE CARD ---- */
.achievement-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
}
.achievement-card.unlocked {
  border-color: rgba(245,158,11,0.3);
  background: rgba(245,158,11,0.06);
}
.achievement-card.unlocked:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(245,158,11,0.2); }
.achievement-icon {
  font-size: 2.5rem;
  filter: grayscale(1) opacity(0.4);
  transition: filter 0.3s;
}
.achievement-card.unlocked .achievement-icon { filter: none; animation: badgeUnlock 0.6s ease; }
.achievement-title { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }
.achievement-card.unlocked .achievement-title { color: var(--accent-orange); }

/* ---- STAT CARD ---- */
.stat-card {
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

/* ---- TOAST ---- */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 9998;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  animation: toastSlide 0.4s ease forwards;
  max-width: 320px;
  font-size: 0.9rem;
  font-weight: 500;
}
.toast.success { border-left: 3px solid var(--accent-green); }
.toast.error   { border-left: 3px solid var(--accent-red); }
.toast.info    { border-left: 3px solid var(--accent-blue); }
.toast.gold    { border-left: 3px solid var(--accent-orange); }
.toast-out     { animation: toastOut 0.4s ease forwards; }

/* ---- VIDEO WRAPPER ---- */
.video-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border-subtle);
}
.video-wrapper iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
}

/* ---- PROJECT CARD ---- */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.project-card:hover {
  border-color: var(--border-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.project-card-top {
  padding: 1.75rem;
  background: var(--gradient-card);
  border-bottom: 1px solid var(--border-subtle);
}
.project-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}
.project-card-body { padding: 1.5rem; }
.project-steps {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: none;
}
.project-steps.visible { display: block; }
.step-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}
.step-item:last-child { border-bottom: none; }
.step-num {
  width: 26px; height: 26px;
  background: var(--gradient-btn);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700;
  color: #fff; flex-shrink: 0;
}

/* ---- ROADMAP ---- */
.roadmap-track {
  position: relative;
  padding-left: 2rem;
}
.roadmap-track::before {
  content: '';
  position: absolute;
  left: 0.6rem; top: 0; bottom: 0;
  width: 2px;
  background: var(--gradient-hero);
  border-radius: 2px;
}
.roadmap-node {
  position: relative;
  padding-bottom: 2rem;
}
.roadmap-node::before {
  content: '';
  position: absolute;
  left: -1.65rem; top: 0.15rem;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--gradient-btn);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.2);
}

/* ---- LEVEL SECTION HEADER ---- */
.level-section {
  margin-bottom: 2.5rem;
}
.level-section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
}
.level-section-icon { font-size: 1.5rem; }
.level-section-title { font-size: 1rem; font-weight: 700; }