/* ===== THEORY PAGE STYLES ===== */

.theory-layout {
  display: flex;
  min-height: 100vh;
  padding-top: 64px;
}

/* Sidebar */
.theory-sidebar {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  width: 240px;
  flex-shrink: 0;
  padding: 2rem 1.25rem;
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  background: var(--bg-secondary);
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-left: 0.5rem;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.toc-link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.toc-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}

.toc-link.active {
  color: var(--accent-blue);
  background: rgba(59,130,246,0.08);
  border-left-color: var(--accent-blue);
}

/* Main Content */
.theory-main {
  flex: 1;
  min-width: 0;
  padding: 0 0 6rem;
}

.page-title-section {
  padding: 3.5rem 3rem 2rem;
  background: radial-gradient(ellipse at 50% 0%, rgba(59,130,246,0.1) 0%, transparent 70%);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0;
}

.page-title-section h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  margin: 0.75rem 0;
}

.page-title-section p {
  color: var(--text-secondary);
}

/* Theory Sections */
.theory-section {
  padding: 3.5rem 3rem;
  border-bottom: 1px solid var(--border-color);
}

.theory-section:last-child { border-bottom: none; }

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

.theory-section h2 {
  font-size: clamp(1.4rem, 3vw, 1.875rem);
  font-weight: 800;
  margin-bottom: 1.25rem;
  line-height: 1.2;
}

.theory-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
  color: var(--text-primary);
}

.theory-section p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  font-size: 0.975rem;
  max-width: 720px;
}

.theory-section strong { color: var(--text-primary); }
.theory-section em { color: var(--accent-cyan); font-style: normal; }

/* Math Blocks */
.math-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-blue);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.math-block.compact {
  padding: 0.75rem 1rem;
  margin: 0.75rem 0;
}

.math-equation {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--code-accent);
  line-height: 1.8;
  font-weight: 500;
}

.math-equation.small {
  font-size: 0.875rem;
}

.math-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  margin-bottom: 0;
}


/* Info Cards */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: transform var(--transition-base);
}

.info-card:hover { transform: translateY(-2px); }

.info-card.highlight-blue  { border-top: 2px solid var(--accent-blue); }
.info-card.highlight-cyan  { border-top: 2px solid var(--accent-cyan); }
.info-card.highlight-purple{ border-top: 2px solid var(--accent-purple); }

.info-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent-blue);
}

.info-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.info-card p {
  font-size: 0.85rem;
  margin: 0;
}

/* Algorithm Box */
.algorithm-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.5rem 0;
}

[data-theme="light"] .algorithm-box {
  background: var(--bg-card);
}

.algo-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

[data-theme="light"] .algo-header {
  background: rgba(0,0,0,0.03);
}

.algo-badge {
  padding: 0.2rem 0.6rem;
  background: rgba(59,130,246,0.2);
  color: var(--accent-blue);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.algorithm-box pre {
  border: none;
  border-radius: 0;
  margin: 0;
}

/* Steps */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.step-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(59,130,246,0.15);
  border: 1px solid rgba(59,130,246,0.25);
  color: var(--accent-blue);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}

.step-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.step-content p {
  font-size: 0.875rem;
  margin: 0;
}

/* Formula Table */
.formula-table {
  margin: 1.5rem 0;
  overflow-x: auto;
}

.formula-table table, .comparison-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.formula-table th, .comparison-table th {
  background: rgba(59,130,246,0.1);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(59,130,246,0.2);
}

.formula-table td, .comparison-table td {
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

.formula-table tr:last-child td, .comparison-table tr:last-child td { border-bottom: none; }
.formula-table tr:hover td, .comparison-table tr:hover td { background: rgba(255,255,255,0.02); }

.comparison-table td.pro { color: var(--accent-green); }
.comparison-table td.con { color: #f87171; }
.comparison-table td.neutral { color: var(--accent-orange); }

/* Callouts */
.callout {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 1.5rem 0;
}

.callout-cyan {
  background: rgba(6,182,212,0.1);
  border: 1px solid rgba(6,182,212,0.25);
  color: var(--lpf-color);
}

.callout-purple {
  background: rgba(139,92,246,0.1);
  border: 1px solid rgba(139,92,246,0.25);
  color: var(--hpf-color);
}


/* Code Block */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.5rem 0;
}


.code-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border-color);
}

.code-lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.code-block pre { border: none; border-radius: 0; margin: 0; }

/* Window Cards */
.window-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.window-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color var(--transition-fast);
}

.window-card:hover { border-color: rgba(59,130,246,0.3); }

.window-name {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.rectangular-win { background: rgba(248,113,113,0.12); color: #f87171; }
.hamming-win     { background: rgba(6,182,212,0.12); color: var(--accent-cyan); }
.blackman-win    { background: rgba(139,92,246,0.12); color: var(--accent-purple); }
.hann-win        { background: rgba(16,185,129,0.12); color: var(--accent-green); }

.window-specs {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.window-specs li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.825rem;
  color: var(--text-muted);
}

.window-specs li code {
  background: rgba(255,255,255,0.06);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

.window-note {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin: 0.5rem 0 0;
  font-style: italic;
}

/* Application Grid */
.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-base);
}

.app-card:hover {
  border-color: rgba(59,130,246,0.3);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.app-emoji { font-size: 2rem; margin-bottom: 0.75rem; }

.app-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.app-card p {
  font-size: 0.85rem;
  margin: 0;
}

/* CTA Final */
.cta-final {
  background: radial-gradient(ellipse at 50% 100%, rgba(59,130,246,0.1) 0%, transparent 70%);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  margin-top: 2.5rem;
}

.cta-final h3 { font-size: 1.4rem; font-weight: 800; margin-bottom: 0.75rem; }
.cta-final p { color: var(--text-secondary); margin-bottom: 1.5rem; }

/* Comparison Table */
.comparison-table { margin: 1.5rem 0; overflow-x: auto; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .theory-sidebar { display: none; }
  .theory-section { padding: 2.5rem 1.5rem; }
  .page-title-section { padding: 2.5rem 1.5rem 1.5rem; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .app-grid { grid-template-columns: 1fr 1fr; }
  .window-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .info-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr; }
  .theory-section { padding: 2rem 1rem; }
}