/* ========== GLOBAL LAYOUT STRUCTURE ==========
   Every page follows: Top Bar → Context Header → Primary + Secondary → Proof Footer
   This creates a predictable, calm experience across all screens */

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ========== TOP BAR
   Left: Project name | Center: Progress indicator | Right: Status badge */
.top-bar {
  height: var(--top-bar-height);
  background-color: var(--color-white);
  border-bottom: var(--border-width) solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.project-name {
  font-family: var(--font-headings);
  font-weight: 700;
  font-size: var(--font-size-h4);
  color: var(--color-text-primary);
  letter-spacing: var(--letter-spacing-tight);
}

.progress-indicator {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ========== CONTEXT HEADER
   Large serif headline + 1-line subtext, clear purpose, no hype */
.context-header {
  padding: var(--spacing-lg) var(--spacing-md);
  background-color: var(--color-background);
  max-width: var(--max-container-width);
  width: 100%;
  margin: 0 auto;
}

.context-header h1 {
  font-size: var(--font-size-h1);
  margin-bottom: var(--spacing-xs);
  letter-spacing: var(--letter-spacing-tight);
}

.context-subtext {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  max-width: var(--max-text-width);
  line-height: var(--line-height-relaxed);
}

/* ========== MAIN WORKSPACE
   Primary (70%) + Secondary Panel (30%) layout
   Primary: where main interaction happens
   Secondary: explanations, prompts, actions */
.main-layout {
  display: flex;
  flex: 1;
  max-width: var(--max-container-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  padding-bottom: calc(var(--footer-height) + var(--spacing-lg));
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.primary-workspace {
  flex: 0 0 calc(70% - var(--spacing-lg)/2);
  min-width: 0;
}

.secondary-panel {
  flex: 0 0 calc(30% - var(--spacing-lg)/2);
  min-width: 300px;
  position: sticky;
  top: calc(var(--top-bar-height) + var(--spacing-md));
  align-self: flex-start;
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.secondary-panel h3 {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-sm);
}

.secondary-panel p {
  font-size: var(--font-size-small);
}

.secondary-panel hr {
  border: none;
  border-top: var(--border-width) solid var(--color-border);
  margin: var(--spacing-sm) 0;
}

/* ========== PROOF FOOTER
   Persistent bottom section: Checklist of deliverables
   □ UI Built □ Logic Working □ Test Passed □ Deployed */
.proof-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: var(--footer-height);
  background-color: var(--color-white);
  border-top: var(--border-width) solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
  z-index: 50;
}

.proof-list {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.proof-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-small);
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.proof-item:hover {
  color: var(--color-accent);
}

.proof-item input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-accent);
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1024px) {
  .main-layout {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .primary-workspace {
    flex: 1;
    width: 100%;
  }

  .secondary-panel {
    flex: 1;
    width: 100%;
    position: static;
  }
}

@media (max-width: 640px) {
  .top-bar {
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-sm);
    height: auto;
  }

  .progress-indicator {
    font-size: var(--font-size-xs);
  }

  .context-header {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .context-header h1 {
    font-size: var(--font-size-h2);
  }

  .main-layout {
    padding: 0 var(--spacing-sm);
    padding-bottom: calc(var(--footer-height) + var(--spacing-md));
  }

  .proof-list {
    gap: var(--spacing-sm);
    flex-wrap: wrap;
  }
}