---
phase: 27-component-library
plan: 01
type: execute
wave: 1
depends_on: []
files_modified:
  - paperforge/plugin/styles.css
autonomous: true
requirements:
  - COMP-01  # Pure CSS/DOM dashboard visualizations
  - COMP-02  # Obsidian CSS variable theming
  - COMP-03  # Loading states, CSS transitions, responsive breakpoints

must_haves:
  truths:
    - "Metric cards show large value + uppercase label with accent color left bar, optional progress bar variant, and CSS opacity transition on value change"
    - "Lifecycle stepper renders 6 vertical steps with circles (border-radius:50%), human-readable labels (Imported/Indexed/PDF Ready/Fulltext Ready/Deep Read/AI Ready), and CSS ::before connecting lines between steps"
    - "Health matrix renders as 2x2 CSS grid with 4 color-coded cells (PDF/OCR/Note/Asset), green/yellow/red status classes via Obsidian var(--color-*) variables, status icons, and hover tooltips"
    - "Maturity gauge renders as 6-segment horizontal bar with filled segments colored and unfilled gray, current level number displayed below, blocking checks listed as bullet points when level < 6"
    - "Bar chart renders horizontal bars with lifecycle-name label, proportional track/fill (width as percentage), count number, and smooth CSS transition: width 0.3s"
    - "All 5 components show a loading skeleton shimmer (CSS @keyframes shimmer animation) when parent has .paperforge-loading class; empty state shows muted 'No data' message"
    - "All colors use Obsidian CSS variables (var(--color-green), var(--color-yellow), var(--color-red), var(--color-cyan), var(--color-blue), var(--color-purple), var(--text-muted), var(--background-modifier-border)) and components respond to dark/light theme changes automatically"
  artifacts:
    - path: "paperforge/plugin/styles.css"
      provides: "All component CSS including loading skeletons, themed via Obsidian CSS variables"
      min_lines: 200  # new CSS content expected
  key_links:
    - from: "styles.css"
      to: "Obsidian CSS variables"
      via: "var(--color-green), var(--color-yellow), var(--color-red), var(--color-cyan), var(--color-blue), var(--color-purple), var(--text-muted), var(--background-modifier-border)"
    - from: "styles.css .paperforge-loading"
      to: "styles.css @keyframes paperforge-shimmer"
      via: "CSS animation triggering loading skeleton on child elements"
---

<objective>
Create all CSS styling for 5 visualization components in `paperforge/plugin/styles.css`. Each component gets its own clearly commented section (Section 7 through Section 11+). All styling uses Obsidian CSS variables exclusively -- no hardcoded colors. Components are fully responsive across sidebar and full-width layouts.

Purpose: Establish the visual contract that Phase 27-02 (JS render methods) will implement against. CSS class names are locked by CONTEXT.md decisions D-04 through D-23.
Output: `paperforge/plugin/styles.css` with 5 new sections appended after existing Section 6 (Setup Wizard Modal).
</objective>

<execution_context>
@C:/Users/Lin/.opencode/get-shit-done/workflows/execute-plan.md
@C:/Users/Lin/.opencode/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/phases/27-component-library/27-CONTEXT.md
@paperforge/plugin/styles.css

No prior plan SUMMARY references needed -- this is the first plan of Phase 27.
</context>

<tasks>

<task type="auto">
  <name>Task 1: Add loading skeleton CSS + enhanced metric card CSS</name>
  <files>paperforge/plugin/styles.css</files>

  <read_first>
  - paperforge/plugin/styles.css (existing file, to see pattern and append after Section 6)
  - .planning/phases/27-component-library/27-CONTEXT.md (decisions D-04, D-05, D-06, D-24, D-25, D-26, D-27, D-29)
  </read_first>

  <action>
  Append to `paperforge/plugin/styles.css` after the last line (Section 6 ends at line 658). Add TWO new sections:

  **Section 7 -- Loading Skeleton & Empty States (D-24, D-25)**

  ```css
  /* ==========================================================================
     SECTION 7 — Loading Skeleton & Empty States
     ========================================================================== */
  .paperforge-loading {
    position: relative;
    overflow: hidden;
  }

  .paperforge-loading > * {
    opacity: 0.6;
    pointer-events: none;
  }

  .paperforge-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
      90deg,
      transparent 0%,
      rgba(255, 255, 255, 0.08) 50%,
      transparent 100%
    );
    background-size: 200% 100%;
    animation: paperforge-shimmer 1.5s ease-in-out infinite;
    pointer-events: none;
  }

  @keyframes paperforge-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }

  /* Dark mode adjustment: lighter shimmer is slightly dimmer */
  .theme-dark .paperforge-loading::after {
    background: linear-gradient(
      90deg,
      transparent 0%,
      rgba(255, 255, 255, 0.04) 50%,
      transparent 100%
    );
    background-size: 200% 100%;
  }

  .paperforge-empty-state {
    text-align: center;
    padding: 24px 12px;
    color: var(--text-muted);
    font-size: var(--font-ui-small);
    font-style: italic;
  }
  ```

  **Section 8 -- Metric Card (Enhanced, D-04, D-05, D-06)**

  The existing `.paperforge-metric-card` at lines 99-143 already has the basic structure. Replace the existing block with this enhanced version that adds the optional progress bar and value transition. IMPORTANT: Keep the existing `.paperforge-metrics` grid container (lines 93-97) unchanged.

  Replace the ENTIRE existing Section 2 block (lines 99 through 143 -- the `.paperforge-metric-card`, `.paperforge-metric-value`, `.paperforge-metric-label` rules) with this enhanced version:

  ```css
  .paperforge-metric-card {
    background: var(--background-secondary);
    border: 1px solid var(--background-modifier-border);
    border-radius: var(--radius-m);
    padding: 16px 12px 14px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: border-color 0.15s, opacity 0.3s;
  }

  .paperforge-metric-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--metric-color, var(--interactive-accent));
    border-radius: 0 2px 2px 0;
  }

  .paperforge-metric-card:hover {
    border-color: var(--interactive-accent);
  }

  .paperforge-metric-value {
    font-size: clamp(18px, 4vw, 28px);
    font-weight: var(--font-bold);
    line-height: 1.1;
    color: var(--text-normal);
    letter-spacing: -0.5px;
    transition: opacity 0.3s;
  }

  .paperforge-metric-label {
    font-size: var(--font-ui-smaller);
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-medium);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Optional progress bar inside metric card (D-05) */
  .paperforge-metric-progress {
    margin-top: 10px;
    height: 4px;
    border-radius: 2px;
    background: var(--background-modifier-border);
    overflow: hidden;
  }

  .paperforge-metric-progress-fill {
    height: 100%;
    border-radius: 2px;
    background: var(--metric-color, var(--interactive-accent));
    transition: width 0.3s;
  }
  ```

  **DO NOT** touch the `.paperforge-metrics` grid container (lines 93-97). Leave it exactly as-is. Only replace the individual card/value/label rules (what was lines 99-143).

  </action>

  <acceptance_criteria>
  - `styles.css` contains `@keyframes paperforge-shimmer` with `background-position` keyframes
  - `styles.css` contains `.paperforge-loading::after` with the shimmer gradient
  - `styles.css` contains `.paperforge-empty-state` with `var(--text-muted)`, `font-style: italic`
  - `styles.css` contains `.paperforge-metric-card` with `transition: border-color 0.15s, opacity 0.3s` (D-06 opacity transition added)
  - `styles.css` contains `.paperforge-metric-progress` and `.paperforge-metric-progress-fill` classes
  - `styles.css` still contains `.paperforge-metrics` grid container class
  - All colors use `var(--*)` Obsidian CSS variables — grep for hardcoded hex/rgb: zero matches outside `.paperforge-install-log` and `.theme-dark` override
  - Shimmer animation duration is exactly `1.5s`
  </acceptance_criteria>

  <verify>
  <automated>python -c "
with open('paperforge/plugin/styles.css') as f:
    c = f.read()
assert '@keyframes paperforge-shimmer' in c, 'Missing shimmer keyframes'
assert '.paperforge-loading::after' in c, 'Missing loading pseudo-element'
assert '.paperforge-empty-state' in c, 'Missing empty state'
assert '.paperforge-metric-card' in c, 'Missing metric card'
assert '.paperforge-metric-progress-fill' in c, 'Missing progress fill'
assert 'transition: border-color 0.15s, opacity 0.3s' in c, 'Missing opacity transition'
assert 'var(--text-muted)' in c, 'Hardcoded color detected'
print('Task 1 CSS verification: ALL CHECKS PASSED')
"</automated>
  </verify>

  <done>
  Loading skeleton shimmer CSS is defined as @keyframes paperforge-shimmer with 1.5s animation. Enhanced metric card has opacity 0.3s transition on value change and optional progress bar sub-element. Empty state has muted italic styling. All use Obsidian CSS variables.
  </done>
</task>

<task type="auto">
  <name>Task 2: Add lifecycle stepper CSS + health matrix CSS</name>
  <files>paperforge/plugin/styles.css</files>

  <read_first>
  - paperforge/plugin/styles.css (output after Task 1, to append after Section 8)
  - .planning/phases/27-component-library/27-CONTEXT.md (decisions D-07 through D-16, D-26, D-27, D-29)
  </read_first>

  <action>
  Append to `paperforge/plugin/styles.css` after Section 8 (Metric Card). Add TWO sections:

  **Section 9 -- Lifecycle Stepper (D-07 through D-11)**

  ```css
  /* ==========================================================================
     SECTION 9 — Lifecycle Stepper
     ========================================================================== */
  .paperforge-lifecycle-stepper {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    position: relative;
  }

  .paperforge-lifecycle-stepper .step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    position: relative;
    min-height: 36px;
  }

  .paperforge-lifecycle-stepper .step-indicator {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: var(--font-bold);
    position: relative;
    z-index: 1;
    background: var(--background-modifier-border);
    color: var(--text-muted);
    border: 2px solid var(--background-modifier-border);
    transition: background 0.2s, border-color 0.2s, color 0.2s;
  }

  /* Connecting line between steps via ::before on each step (D-09) */
  .paperforge-lifecycle-stepper .step::before {
    content: '';
    position: absolute;
    left: 22px;  /* centers under the 24px indicator circle */
    top: 32px;   /* below the indicator */
    bottom: -8px;
    width: 2px;
    background: var(--background-modifier-border);
    z-index: 0;
  }

  .paperforge-lifecycle-stepper .step:last-child::before {
    display: none;
  }

  .paperforge-lifecycle-stepper .step-label {
    font-size: var(--font-ui-small);
    color: var(--text-muted);
    font-weight: var(--font-medium);
    line-height: 1.3;
  }

  /* -- State: completed (D-10) -- */
  .paperforge-lifecycle-stepper .step.completed .step-indicator {
    background: var(--color-green);
    border-color: var(--color-green);
    color: var(--text-on-accent);
  }

  .paperforge-lifecycle-stepper .step.completed .step-indicator::after {
    content: '\u2713';  /* checkmark */
  }

  .paperforge-lifecycle-stepper .step.completed .step-label {
    color: var(--text-normal);
  }

  .paperforge-lifecycle-stepper .step.completed::before {
    background: var(--color-green);
  }

  /* -- State: current (D-10) -- */
  .paperforge-lifecycle-stepper .step.current .step-indicator {
    background: var(--interactive-accent);
    border-color: var(--interactive-accent);
    color: var(--text-on-accent);
    animation: paperforge-step-pulse 2s ease-in-out infinite;
  }

  @keyframes paperforge-step-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255,255,255,0.3); }
    50% { box-shadow: 0 0 0 6px rgba(255,255,255,0); }
  }

  .paperforge-lifecycle-stepper .step.current .step-label {
    color: var(--text-normal);
    font-weight: var(--font-semibold);
  }

  /* -- State: pending (D-10) -- */
  .paperforge-lifecycle-stepper .step.pending .step-indicator {
    opacity: 0.4;
  }

  .paperforge-lifecycle-stepper .step.pending .step-label {
    opacity: 0.5;
  }
  ```

  **Section 10 -- Health Matrix (D-12 through D-16)**

  ```css
  /* ==========================================================================
     SECTION 10 — Health Matrix
     ========================================================================== */
  .paperforge-health-matrix {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .paperforge-health-cell {
    background: var(--background-secondary);
    border: 1px solid var(--background-modifier-border);
    border-radius: var(--radius-m);
    padding: 14px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    cursor: help;
    transition: border-color 0.15s;
    position: relative;
  }

  .paperforge-health-cell:hover {
    border-color: var(--interactive-accent);
  }

  .paperforge-health-cell-icon {
    font-size: 18px;
    line-height: 1;
  }

  .paperforge-health-cell-label {
    font-size: var(--font-ui-smaller);
    font-weight: var(--font-medium);
    color: var(--text-normal);
    text-transform: uppercase;
    letter-spacing: 0.3px;
  }

  /* Status coloring (D-14) */
  .paperforge-health-cell.ok {
    border-left: 3px solid var(--color-green);
  }

  .paperforge-health-cell.ok .paperforge-health-cell-icon {
    color: var(--color-green);
  }

  .paperforge-health-cell.warn {
    border-left: 3px solid var(--color-yellow);
  }

  .paperforge-health-cell.warn .paperforge-health-cell-icon {
    color: var(--color-yellow);
  }

  .paperforge-health-cell.fail {
    border-left: 3px solid var(--color-red);
  }

  .paperforge-health-cell.fail .paperforge-health-cell-icon {
    color: var(--color-red);
  }

  /* Tooltip on hover (D-16) */
  .paperforge-health-cell[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--background-modifier-hover);
    color: var(--text-normal);
    font-size: 11px;
    padding: 4px 10px;
    border-radius: var(--radius-s);
    white-space: nowrap;
    pointer-events: none;
    z-index: 100;
    border: 1px solid var(--background-modifier-border);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  }

  .paperforge-health-cell[title]:hover::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--background-modifier-border);
    pointer-events: none;
    z-index: 100;
  }
  ```

  </action>

  <acceptance_criteria>
  - `styles.css` contains `.paperforge-lifecycle-stepper` with `flex-direction: column`
  - `styles.css` contains `.step-indicator` with `border-radius: 50%` and `width: 24px; height: 24px`
  - `styles.css` contains `.step::before` with positioned connecting line (`top: 32px`, `width: 2px`)
  - `styles.css` contains `.step.completed` rules referencing `var(--color-green)`
  - `styles.css` contains `.step.current` rules referencing `var(--interactive-accent)` and `@keyframes paperforge-step-pulse`
  - `styles.css` contains `.step.pending` with `opacity: 0.4`
  - `styles.css` contains `.paperforge-health-matrix` with `grid-template-columns: 1fr 1fr`
  - `styles.css` contains `.paperforge-health-cell.ok` with `var(--color-green)`, `.warn` with `var(--color-yellow)`, `.fail` with `var(--color-red)`
  - `styles.css` contains hover tooltip via `[title]:hover::after` with `attr(title)` content
  - All colors use `var(--*)` — zero hardcoded hex/rgb values
  </acceptance_criteria>

  <verify>
  <automated>python -c "
with open('paperforge/plugin/styles.css') as f:
    c = f.read()
assert '.paperforge-lifecycle-stepper' in c, 'Missing lifecycle stepper'
assert '.step-indicator' in c and 'border-radius: 50%' in c, 'Missing step indicator circle'
assert '.step.completed' in c and 'var(--color-green)' in c, 'Missing completed state'
assert '.step.current' in c and 'var(--interactive-accent)' in c, 'Missing current state'
assert '@keyframes paperforge-step-pulse' in c, 'Missing pulse animation'
assert '.step.pending' in c, 'Missing pending state'
assert '.paperforge-health-matrix' in c, 'Missing health matrix'
assert 'grid-template-columns: 1fr 1fr' in c, 'Wrong grid layout'
assert '.paperforge-health-cell.ok' in c, 'Missing ok class'
assert '.paperforge-health-cell.warn' in c, 'Missing warn class'
assert '.paperforge-health-cell.fail' in c, 'Missing fail class'
assert 'attr(title)' in c, 'Missing tooltip via attr'
print('Task 2 CSS verification: ALL CHECKS PASSED')
"</automated>
  </verify>

  <done>
  Lifecycle stepper renders 6 vertical steps with border-radius circles, ::before connecting lines, and completed/current/pending CSS class states. Health matrix renders as 2x2 grid with color-coded cells using Obsidian CSS variables and hover tooltips. Pulse animation defined for current step.
  </done>
</task>

<task type="auto">
  <name>Task 3: Add maturity gauge CSS + bar chart CSS</name>
  <files>paperforge/plugin/styles.css</files>

  <read_first>
  - paperforge/plugin/styles.css (output after Task 2, to append after Section 10)
  - .planning/phases/27-component-library/27-CONTEXT.md (decisions D-17 through D-23, D-26, D-27, D-29)
  </read_first>

  <action>
  Append to `paperforge/plugin/styles.css` after Section 10 (Health Matrix). Add TWO sections:

  **Section 11 -- Maturity Gauge (D-17 through D-20)**

  ```css
  /* ==========================================================================
     SECTION 11 — Maturity Gauge
     ========================================================================== */
  .paperforge-maturity-gauge {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .paperforge-maturity-gauge .gauge-track {
    display: flex;
    gap: 4px;
    height: 16px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--background-modifier-border);
  }

  .paperforge-maturity-gauge .gauge-segment {
    flex: 1;
    height: 100%;
    border-radius: 2px;
    background: var(--background-modifier-border);
    transition: background 0.3s;
  }

  .paperforge-maturity-gauge .gauge-segment.filled {
    background: var(--interactive-accent);
  }

  /* Gradient variant: each filled segment gets progressively richer color (the agent's discretion) */
  .paperforge-maturity-gauge .gauge-segment.filled.level-1 { background: var(--color-cyan); }
  .paperforge-maturity-gauge .gauge-segment.filled.level-2 { background: var(--color-blue); }
  .paperforge-maturity-gauge .gauge-segment.filled.level-3 { background: var(--color-purple); }
  .paperforge-maturity-gauge .gauge-segment.filled.level-4 { background: var(--color-green); }
  .paperforge-maturity-gauge .gauge-segment.filled.level-5 { background: var(--color-yellow); }
  .paperforge-maturity-gauge .gauge-segment.filled.level-6 { background: var(--color-red); }

  .paperforge-maturity-gauge .gauge-level {
    font-size: var(--font-ui-medium);
    font-weight: var(--font-bold);
    color: var(--text-normal);
    text-align: center;
  }

  .paperforge-maturity-gauge .gauge-blockers {
    list-style: disc;
    padding-left: 20px;
    margin: 4px 0 0;
  }

  .paperforge-maturity-gauge .gauge-blockers li {
    font-size: var(--font-ui-smaller);
    color: var(--text-muted);
    line-height: 1.5;
  }
  ```

  **Section 12 -- Bar Chart (D-21 through D-23)**

  ```css
  /* ==========================================================================
     SECTION 12 — Bar Chart
     ========================================================================== */
  .paperforge-bar-chart {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 4px 0;
  }

  .paperforge-bar-chart .bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .paperforge-bar-chart .bar-label {
    font-size: var(--font-ui-smaller);
    color: var(--text-muted);
    flex: 0 0 90px;
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: var(--font-medium);
  }

  .paperforge-bar-chart .bar-track {
    flex: 1;
    height: 20px;
    border-radius: 4px;
    background: var(--background-modifier-border);
    overflow: hidden;
    position: relative;
  }

  .paperforge-bar-chart .bar-fill {
    height: 100%;
    border-radius: 4px;
    background: var(--interactive-accent);
    transition: width 0.3s;
    min-width: 2px;
  }

  .paperforge-bar-chart .bar-count {
    font-size: var(--font-ui-smaller);
    font-weight: var(--font-bold);
    color: var(--text-normal);
    flex: 0 0 30px;
    text-align: left;
    font-variant-numeric: tabular-nums;
  }

  /* Color variants for bar fills based on lifecycle stage */
  .paperforge-bar-chart .bar-fill.stage-imported { background: var(--color-cyan); }
  .paperforge-bar-chart .bar-fill.stage-indexed { background: var(--color-blue); }
  .paperforge-bar-chart .bar-fill.stage-pdf-ready { background: var(--color-purple); }
  .paperforge-bar-chart .bar-fill.stage-fulltext-ready { background: var(--color-green); }
  .paperforge-bar-chart .bar-fill.stage-deep-read { background: var(--color-yellow); }
  .paperforge-bar-chart .bar-fill.stage-ai-ready { background: var(--color-red); }
  ```

  </action>

  <acceptance_criteria>
  - `styles.css` contains `.paperforge-maturity-gauge` with `flex-direction: column`
  - `styles.css` contains `.gauge-segment.filled` with `var(--interactive-accent)` background
  - `styles.css` contains `.gauge-segment.filled.level-1` through `.level-6` with distinct var(--color-*) values
  - `styles.css` contains `.gauge-blockers` as `list-style: disc` with `padding-left: 20px`
  - `styles.css` contains `.paperforge-bar-chart` with `flex-direction: column`
  - `styles.css` contains `.bar-row` with `display: flex; align-items: center`
  - `styles.css` contains `.bar-fill` with `transition: width 0.3s` (D-23)
  - `styles.css` contains `.bar-fill.stage-imported` through `.stage-ai-ready` color variant classes
  - All colors use `var(--*)` — zero hardcoded hex/rgb values
  </acceptance_criteria>

  <verify>
  <automated>python -c "
with open('paperforge/plugin/styles.css') as f:
    c = f.read()
assert '.paperforge-maturity-gauge' in c, 'Missing maturity gauge'
assert '.gauge-segment.filled' in c, 'Missing filled segment'
assert '.gauge-segment.filled.level-1' in c, 'Missing level-1 color'
assert '.gauge-segment.filled.level-6' in c, 'Missing level-6 color'
assert '.gauge-blockers' in c, 'Missing blockers list'
assert '.paperforge-bar-chart' in c, 'Missing bar chart'
assert '.bar-row' in c, 'Missing bar row'
assert '.bar-fill' in c, 'Missing bar fill'
assert 'transition: width 0.3s' in c, 'Missing width transition'
assert '.bar-fill.stage-imported' in c, 'Missing stage-imported color'
assert '.bar-fill.stage-ai-ready' in c, 'Missing stage-ai-ready color'
print('Task 3 CSS verification: ALL CHECKS PASSED')
"</automated>
  </verify>

  <done>
  Maturity gauge renders as segmented progress bar with 6 level-specific color classes, level number display, and blocking checks list. Bar chart renders horizontal bars with lifecycle stage color variants, transition: width 0.3s. All components use Obsidian CSS variables.
  </done>
</task>

</tasks>

<verification>
1. All 5 component CSS rule sets exist in styles.css (metric card, lifecycle stepper, health matrix, maturity gauge, bar chart)
2. Loading skeleton shimmer keyframes defined
3. Empty state defined
4. @keyframes paperforge-shimmer and @keyframes paperforge-step-pulse both defined
5. All CSS uses var(--*) for colors — grep for `#[0-9a-f]` or `rgb(` returns zero matches outside exceptions (`.paperforge-install-log` hardcoded color is pre-existing)
6. Section header comments follow existing pattern: `/* ===== SECTION N — Name ===== */`
7. No hardcoded colors outside the two allowed exceptions: `.paperforge-install-log` pre-existing dark background, and `.theme-dark .paperforge-loading::after`
</verification>

<success_criteria>
- [ ] styles.css has all 12 sections (6 existing + 6 new: Loading Skeleton, Metric Card enhanced, Lifecycle Stepper, Health Matrix, Maturity Gauge, Bar Chart)
- [ ] Each new section has a header comment matching `/* ===== SECTION N — Name ===== */` pattern
- [ ] All component class names match CONTEXT.md decisions (D-04 through D-23)
- [ ] All colors reference Obsidian CSS variables
- [ ] Loading skeleton is a reusable class (`.paperforge-loading`) that any component can use
- [ ] Empty state is a reusable class (`.paperforge-empty-state`)
- [ ] CSS transitions defined for metric value opacity, bar-fill width, and gauge segment color
- [ ] Health matrix tooltip implemented via `[title]:hover::after`
- [ ] Lifecycle stepper connecting lines via `::before` pseudo-element
- [ ] No npm dependencies, no external CSS frameworks, no JS chart libraries (D-03)
</success_criteria>

<output>
After completion, create `.planning/phases/27-component-library/27-01-SUMMARY.md`
</output>
