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+# Phase 9: Calendar CSS (`styles.css`)
+
+**Status:** Not started
+**Depends on:** Phase 3 (calendar-renderer.ts — must match the CSS classes used in rendering)
+**Modifies:** `styles.css`
+
+---
+
+## Overview
+
+Append calendar styles to the plugin's stylesheet. Use Obsidian CSS variables for theme compatibility (light/dark).
+
+---
+
+## CSS Classes
+
+```
+.ai-pulse-calendar              — container
+.ai-pulse-calendar-nav          — month navigation bar
+.ai-pulse-calendar-nav-title    — "March 2026" (clickable → opens monthly note — from fork)
+.ai-pulse-calendar-nav-year     — year label (clickable → opens yearly note — from fork)
+.ai-pulse-calendar-nav-quarter  — quarter label, e.g. "Q1" (clickable → opens quarterly note — from fork)
+.ai-pulse-calendar-nav-btn      — < > Today buttons
+.ai-pulse-calendar-grid         — the 7-column grid (8-column when week numbers shown)
+.ai-pulse-calendar-weekday      — header cells (Mon, Tue...)
+.ai-pulse-calendar-weeknum      — week number cell (from fork: can be left or right column)
+.ai-pulse-calendar-day          — individual day cell
+.ai-pulse-calendar-day.today    — today highlight
+.ai-pulse-calendar-day.has-note — day with a note
+.ai-pulse-calendar-day.active   — currently open note's date
+.ai-pulse-calendar-day.other-month — padding days from adjacent months
+.ai-pulse-calendar-dots         — dot container within day cell
+.ai-pulse-calendar-dot          — individual dot (word count)
+```
+
+---
+
+## Notes
+
+- Use `var(--background-primary)`, `var(--text-normal)`, `var(--interactive-accent)`, etc. for theme compatibility.
+- The grid should be responsive within the sidebar width.
+- Day cells should have consistent sizing — use CSS Grid with `grid-template-columns: repeat(7, 1fr)` (or 8 when week numbers are shown).
+- Today highlight should use `var(--interactive-accent)` with reduced opacity for the background.
+- "has-note" dots should be small circles below the day number.
+- "other-month" days should have reduced opacity.
+- "active" day should have a distinct border or background to show it's the currently open note.