/* ============ THEORY SLIDES ============ */
.theory-slide {
  width: 1000px; padding: 30px 36px; border-radius: 16px;
  background: rgba(13,17,23,0.95); border: 1px solid #21262d;
  font-size: 1rem;
  opacity: 0.15;
  visibility: visible;
  transition: opacity 0.6s, visibility 0.6s;
  overflow: hidden;
}
/* Prevent inline images from overflowing slides */
.theory-slide .theory-col-text img { max-width: 100%; max-height: 180px; object-fit: contain; border-radius: 8px; }
.theory-slide.active { opacity: 1; }
.theory-slide.present { opacity: 1; }
/* Overview mode: show all slides */
.impress-overview .theory-slide { opacity: 0.7 !important; visibility: visible !important; }
/* Ensure iframe is clickable on active slide */
.theory-slide:not(.active) .theory-video-wrap { pointer-events: none; }
.theory-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.theory-icon { font-size: 2.5rem; }
.theory-badge {
  font-size: 0.72rem; font-weight: 600; padding: 3px 12px; border-radius: 10px;
  background: rgba(240,136,62,0.12); color: #f0883e; border: 1px solid rgba(240,136,62,0.3);
}
.theory-slide h1 {
  font-size: 2rem; font-weight: 800; margin-bottom: 4px;
  background: linear-gradient(135deg, #f0883e, #58a6ff);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.theory-skill { font-size: 0.9rem; color: #8b949e; margin-bottom: 16px; }
.theory-subtitle { font-size: 0.85rem; color: #58a6ff; margin-bottom: 16px; font-weight: 500; }
.theory-desc { font-size: 1rem; color: #c9d1d9; line-height: 1.7; margin-bottom: 20px; }
.theory-meta { display: flex; gap: 12px; flex-wrap: wrap; }
.t-meta-item {
  padding: 5px 14px; border-radius: 12px; font-size: 0.8rem; font-weight: 600;
  background: rgba(255,255,255,0.04); border: 1px solid #30363d; color: #8b949e;
}

/* ============ TALL / WIDE SLIDE ============ */
.theory-slide-tall { width: 1000px; min-height: auto; }
.theory-slide-wide { width: 1400px; }
.theory-video-wrap {
  margin-top: 12px; border-radius: 8px; overflow: hidden;
  border: 1px solid #21262d; background: #000;
  max-height: 280px;
  position: relative; z-index: 10;
}
.theory-video-wrap iframe {
  width: 100%; height: 280px; display: block;
  pointer-events: auto;
}

/* ============ LEARNING OBJECTIVES (Cards Grid) ============ */
.theory-slide h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 20px; color: #e6edf3; display: flex; align-items: center; gap: 10px; }
/* Octicons in headings */
.th-icon { width: 28px; height: 28px; filter: invert(1); opacity: 0.8; flex-shrink: 0; }
/* Octicons in cards */
.tc-icon { width: 32px; height: 32px; filter: invert(1); opacity: 0.6; margin-bottom: 6px; }
.theory-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.theory-card {
  padding: 20px; border-radius: 12px;
  background: rgba(255,255,255,0.03); border: 1px solid #21262d;
}
.theory-card .tc-icon { font-size: 1.8rem; display: block; margin-bottom: 8px; }
.theory-card strong { font-size: 0.95rem; color: #e6edf3; }
.theory-card p { font-size: 0.82rem; color: #8b949e; margin-top: 4px; line-height: 1.5; }

/* ============ FLOW STEPS ============ */
.flow-steps {
  display: flex; align-items: center; gap: 0; flex-wrap: wrap; justify-content: center;
  margin-bottom: 20px;
}
.flow-step {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 18px; border-radius: 12px;
  background: rgba(255,255,255,0.03); border: 1px solid #21262d;
  min-width: 160px;
}
.flow-num {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 800;
  background: rgba(88,166,255,0.15); color: #58a6ff; border: 1px solid rgba(88,166,255,0.3);
  flex-shrink: 0;
}
.flow-content strong { font-size: 0.85rem; color: #e6edf3; display: block; }
.flow-content p { font-size: 0.72rem; color: #8b949e; margin-top: 2px; }
.flow-content code { font-size: 0.7rem; background: rgba(88,166,255,0.08); color: #58a6ff; padding: 1px 5px; border-radius: 4px; }
.flow-arrow { font-size: 1.2rem; color: #484f58; margin: 0 6px; }
.flow-note { font-size: 0.82rem; color: #8b949e; text-align: center; }

/* Flow step cards (horizontal: 4 columns with images) */
.flow-steps-hz {
  display: flex; align-items: flex-start; gap: 0;
  margin: 14px 0 10px;
}
.flow-hz-arrow {
  display: flex; align-items: center; font-size: 1rem; color: #484f58;
  padding: 0 4px; flex-shrink: 0; min-height: 60px;
}
.flow-step-card {
  flex: 1; min-width: 0;
  border-radius: 8px; overflow: hidden;
  border: 1px solid #21262d; background: rgba(255,255,255,0.02);
}
.flow-step-header {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
}
.flow-step-card img {
  width: 100%; max-height: 140px; object-fit: cover; object-position: top;
  display: block; opacity: 0.85; transition: opacity 0.3s;
  border-top: 1px solid #21262d;
}
.flow-step-card:hover img { opacity: 1; }

/* ============ TWO-COL LAYOUT ============ */
.theory-two-col { display: flex; gap: 24px; align-items: flex-start; }
.theory-col-text { flex: 1; min-width: 0; }
.theory-col-img { flex: 0 0 200px; display: flex; align-items: center; justify-content: center; padding-top: 16px; }
.theory-col-img img { max-width: 100%; border-radius: 12px; }
.theory-col-text p { font-size: 0.82rem; color: #c9d1d9; line-height: 1.6; margin-bottom: 8px; }
.theory-col-text em { color: #58a6ff; font-style: normal; font-weight: 600; }
.theory-col-text h3 { font-size: 1rem; font-weight: 700; color: #e6edf3; margin: 16px 0 8px; }

.theory-list { list-style: none; padding: 0; }
.theory-list li {
  padding: 4px 0 4px 20px; position: relative;
  font-size: 0.8rem; color: #c9d1d9; line-height: 1.4;
}
.theory-list li::before {
  content: '•'; position: absolute; left: 4px; color: #58a6ff; font-weight: 700;
}

.theory-highlight {
  padding: 10px 16px; border-radius: 8px; margin: 12px 0;
  background: rgba(88,166,255,0.06); border-left: 3px solid #58a6ff;
  font-size: 0.85rem; color: #c9d1d9;
}
.theory-highlight a { color: #58a6ff; text-decoration: none; }
.theory-highlight a:hover { text-decoration: underline; }

.theory-code-block {
  padding: 14px 18px; border-radius: 8px; margin: 12px 0;
  background: rgba(255,255,255,0.03); border: 1px solid #21262d;
  font-size: 0.82rem; color: #c9d1d9; line-height: 1.7;
  font-family: 'SFMono-Regular', Consolas, monospace;
}
.theory-code-block code {
  background: rgba(88,166,255,0.1); color: #58a6ff; padding: 1px 6px; border-radius: 4px;
}

/* pre code block (syntax-highlighted) */
pre.theory-code {
  padding: 14px 18px; border-radius: 8px; margin: 12px 0;
  background: rgba(255,255,255,0.03); border: 1px solid #21262d;
  font-size: 0.82rem; color: #c9d1d9; line-height: 1.7;
  font-family: 'SFMono-Regular', Consolas, monospace;
  white-space: pre; overflow-x: auto;
}
pre.theory-code code { background: none; padding: 0; }
.code-key { color: #79c0ff; }
.code-comment { color: #8b949e; font-style: italic; }

/* ============ GIT FLOW DIAGRAM ============ */
.git-flow {
  padding: 14px 18px; border-radius: 8px; margin: 12px 0;
  background: rgba(255,255,255,0.03); border: 1px solid #21262d;
  font-size: 0.82rem; color: #6e7681; line-height: 1.9;
  font-family: 'SFMono-Regular', Consolas, monospace;
}
.git-flow .gf-main { color: #7ee787; }
.git-flow .gf-branch { color: #58a6ff; }
.git-flow .gf-commit { color: #f0883e; }
.git-flow .gf-pr { color: #d2a8ff; }
.git-flow .gf-merge { color: #f778ba; }
.git-flow .gf-dim { color: #484f58; }
.git-flow .gf-active { font-weight: bold; }
.git-flow .gf-highlight {
  background: rgba(88,166,255,0.08); padding: 1px 6px; border-radius: 3px;
}

/* ============ SUMMARY ============ */
.theory-summary {
  display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px;
}
.summary-item {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 18px; border-radius: 10px;
  background: rgba(255,255,255,0.02); border: 1px solid #21262d;
}
.summary-icon { font-size: 1.6rem; flex-shrink: 0; }
.summary-item strong { font-size: 0.9rem; color: #e6edf3; }
.summary-item p { font-size: 0.78rem; color: #8b949e; margin-top: 2px; }
.summary-cta { display: flex; gap: 12px; justify-content: center; margin-top: 8px; }