/* ============================================================
   COMPONENTS.CSS — Buttons, Tags, Lab Visualizers
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: 2px;
  transition: opacity var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard),
              background-color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
  will-change: transform, opacity;
  position: relative;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--color-accent);
  color: #000;
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: rgba(245, 245, 245, 0.3);
  color: var(--color-text);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid transparent;
  padding: 0.875rem 0;
}

.btn-ghost:hover {
  color: var(--color-text);
}

/* Btn arrow icon */
.btn-arrow {
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-standard);
}
.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: rgba(245, 245, 245, 0.04);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--ease-standard),
              background var(--duration-fast) var(--ease-standard);
}

.tag.accent {
  color: var(--color-accent);
  background: var(--color-accent-dim);
  border-color: rgba(0, 229, 255, 0.2);
}

/* ---------- Section Label / Eyebrow ---------- */
.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-eyebrow::after {
  content: '';
  height: 1px;
  width: 3rem;
  background: var(--color-accent);
  flex-shrink: 0;
}

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: var(--color-border);
  margin-block: var(--space-md);
}

/* ============================================================
   LAB VISUALIZERS
   ============================================================ */

/* --- Event Loop Visualizer --- */
.event-loop-wrap {
  position: relative;
  height: 240px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

.loop-column {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.loop-col-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--color-text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.loop-stack {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.25rem;
  min-height: 140px;
  justify-content: flex-start;
}

.loop-task {
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 2px;
  padding: 0.3rem 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--color-accent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  will-change: transform, opacity;
  transform-origin: center;
}

.loop-task.macro {
  background: rgba(245, 245, 245, 0.04);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.loop-task.call-stack {
  background: rgba(0, 229, 255, 0.15);
  border-color: rgba(0, 229, 255, 0.35);
  color: var(--color-accent);
}

.loop-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.loop-btn {
  padding: 0.3rem 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}
.loop-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.loop-status {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--color-text-dim);
  margin-top: 0.5rem;
}

/* --- Hydration vs CSR Demo --- */
.hydration-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.hydration-panel {
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: 1rem;
}

.hydration-panel-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hydration-timeline {
  position: relative;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.hydration-progress {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
  width: 0%;
  transition: width var(--duration-slow) var(--ease-standard);
}

.hydration-phases {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: 0.75rem;
}

.hydration-phase {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--color-text-dim);
}

.phase-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
  flex-shrink: 0;
  transition: background var(--duration-base) var(--ease-standard);
}

.phase-dot.done { background: var(--color-accent); }

.hydration-metric {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  margin-top: 0.75rem;
  color: var(--color-text-muted);
}

.hydration-metric span {
  color: var(--color-accent);
}

/* --- Render Optimization --- */
.render-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.render-panel {
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: 1rem;
}

.render-panel-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.render-canvas-wrap {
  position: relative;
  height: 100px;
  background: rgba(245,245,245,0.02);
  border-radius: 2px;
  overflow: hidden;
}

.render-canvas-wrap canvas {
  width: 100%;
  height: 100%;
}

.render-stats {
  display: flex;
  justify-content: space-between;
  margin-top: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--color-text-dim);
}

.render-stats .val { color: var(--color-accent); }

.lab-run-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.35rem 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}
.lab-run-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================================
   VISION BACKGROUND PARTICLES (canvas layer)
   ============================================================ */
#vision-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  z-index: 0;
}

.vision-content {
  position: relative;
  z-index: 1;
}

/* ============================================================
   CTA MICRO-INTERACTIONS
   ============================================================ */
.cta-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 2rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  width: clamp(260px, 30vw, 340px);
  background: rgba(245,245,245,0.02);
  cursor: pointer;
  transition: border-color var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard),
              background var(--duration-base) var(--ease-standard);
  will-change: transform;
  text-align: left;
}

.cta-card:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
  transform: translateY(-3px);
}

.cta-card:active {
  transform: translateY(-1px);
}

.cta-card-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.cta-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.cta-card-desc {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 28ch;
}

.cta-card-arrow {
  margin-top: 0.5rem;
  color: var(--color-accent);
  font-size: 1rem;
  transition: transform var(--duration-fast) var(--ease-standard);
}
.cta-card:hover .cta-card-arrow {
  transform: translateX(4px);
}

/* ============================================================
   MOBILE ADJUSTMENTS
   ============================================================ */
@media (max-width: 640px) {
  .event-loop-wrap {
    grid-template-columns: 1fr;
    height: auto;
  }

  .loop-stack {
    min-height: 80px;
  }

  .hydration-compare,
  .render-compare {
    grid-template-columns: 1fr;
  }

  .cta-options {
    flex-direction: column;
    align-items: center;
  }

  .cta-card {
    width: 100%;
    max-width: 340px;
  }

  .nav-links { display: none; }
}