docs: introduce Mercury Notebook Deliverable Pattern

studies/202607_CTM_GenesysCX/config.toml

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+# Mercury app-shell theme — NTT DATA brand (light), modern surfaces.
+# See docs/brand.md for the source palette.
+#
+# Loaded from the directory where you launch `mercury` (this project root);
+# restart the server to apply changes. Only keys in mercury/config.py
+# CSS_VARIABLE_MAP emit a CSS variable — anything else in DEFAULT_THEME is
+# either derived or component-baked (e.g. success/warning/danger, slider
+# track, widget bg) and silently no-ops here. Omitted keys are derived
+# from the ones below.
+
+[main]
+title = "CTM × Genesys — Business Case"
+favicon_emoji = "📊"
+footer = "CTM × Genesys CCaaS study"
+notebooks_button_label = "Analyses"
+
+[welcome]
+header = "CTM × Genesys CCaaS"
+message = """
+Interactive business-case notebooks. **Corrected Business Case** keeps
+Genesys's claimed benefits verbatim and adds the costs the pitch omitted;
+**Migration + WFM** strips out every AI capability and prices the platform
+move alone. Tune the 🟡 inputs live for the client, then export the
+personalized report source with `python scripts/export_report.py`.
+"""
+
+[theme]
+# ── Type — Georgia headings, Arial body. Both web-safe system fonts,
+#    so no font_url / network fetch. Georgia ships only normal+bold, so
+#    heading weight is 700 (the default 800 would render as faux-bold). ──
+font_family         = "Arial, 'Helvetica Neue', Helvetica, sans-serif"
+heading_font_family = "Georgia, 'Times New Roman', Times, serif"
+font_size           = "15px"
+font_weight         = "normal"
+heading_font_weight = "700"
+
+# ── Text — NTT ink scale ──
+text_color       = "#2e404d"   # body
+muted_text_color = "#586671"   # captions / secondary
+
+# ── Surfaces — white content floating on a soft neutral canvas (depth).
+#    For a strictly-white page instead, set background_color = "#ffffff". ──
+background_color         = "#f4f5f6"   # outer page
+content_background_color = "#ffffff"   # notebook column
+surface_color            = "#ffffff"
+card_background_color    = "#f8f8f8"   # brand card
+border_color             = "#d5d9db"   # brand border
+border_radius            = "10px"      # modern rounding
+
+# ── Accents — Future Blue. primary_color also drives the Run button + focus. ──
+primary_color             = "#0072bc"
+accent_color              = "#0072bc"
+focus_border_color        = "#0072bc"
+hover_background_color     = "#eef5fb"  # light blue tint
+selected_background_color = "#dcecfa"
+
+# ── Sidebar — clean white, hairline divider ──
+sidebar_background_color = "#ffffff"
+sidebar_text_color       = "#2e404d"
+sidebar_title_color      = "#151d2c"
+sidebar_shadow           = "1px 0 0 #d5d9db"
+
+# ── Top bar — deep NTT navy (brand heading-primary) ──
+topbar_background_color = "#151d2c"
+topbar_text_color       = "#ffffff"
+topbar_border_color     = "rgba(255,255,255,0.08)"
+
+# ── Footer ──
+footer_background_color = "#ffffff"
+footer_text_color       = "#586671"
+footer_border_color     = "#d5d9db"
+
+# ── Run button — subtle brand-blue gradient (else derives from primary) ──
+run_button_background       = "linear-gradient(180deg, #0087dc 0%, #0072bc 100%)"
+run_button_background_hover = "linear-gradient(180deg, #1a93e6 0%, #0079c8 100%)"
+run_button_text_color       = "#ffffff"
+
+# ── Depth — soft, navy-tinted shadows (modern) ──
+shadow_sm = "0 1px 2px rgba(21,29,44,0.05)"
+shadow_md = "0 6px 18px rgba(21,29,44,0.08)"
+shadow_lg = "0 16px 40px rgba(21,29,44,0.10)"