# src/visual_report.py
"""
Generate a self-contained, styled HTML page from deep research results.

Takes the markdown report, sources, and stats produced by DeepResearcher
and wraps them in an editorial-quality HTML document with:
- System/local typography, no remote font provider
- Dark/light theme via prefers-color-scheme
- Hero section with animated gradient + optional hero image
- Inline OG images between sections
- Auto-generated table of contents from headings
- Collapsible compact sources list
- Print/Share toolbar
"""
import html
import json
import logging
import re
from datetime import datetime
from typing import Dict, List, Optional, Tuple

from bs4 import BeautifulSoup

from src.research_utils import strip_thinking
from urllib.parse import urlparse

import markdown

logger = logging.getLogger(__name__)

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _autolink_urls(md_text: str) -> str:
    """Convert bare URLs to markdown links before processing.

    Skips URLs already inside markdown link syntax [text](url).
    """
    # Match bare URLs not already inside ](...)
    return re.sub(
        r'(?<!\]\()(?<!\()(https?://[^\s\)<>]+)',
        r'[\1](\1)',
        md_text,
    )


def _md_to_html(md_text: str) -> str:
    """Convert markdown to HTML with common extensions."""
    md_text = _autolink_urls(md_text)
    result = markdown.markdown(
        md_text,
        extensions=["extra", "codehilite", "toc", "tables", "sane_lists"],
        extension_configs={
            "codehilite": {"css_class": "code", "guess_lang": False},
            "toc": {"marker": "", "toc_depth": "2-3"},
        },
    )
    # Make external links open in new tab
    result = re.sub(
        r'<a href="(https?://)',
        r'<a target="_blank" rel="noopener noreferrer" href="\1',
        result,
    )
    return result


def _extract_headings(md_text: str) -> List[Dict[str, str]]:
    """Pull h2/h3 headings from markdown for table of contents."""
    headings = []
    seen_slugs: Dict[str, int] = {}

    def _plain_heading_text(text: str) -> str:
        text = text.strip().rstrip("#").strip()
        text = re.sub(r'!\[([^\]]*)\]\([^)]+\)', r'\1', text)
        text = re.sub(r'\[([^\]]+)\]\([^)]+\)', r'\1', text)
        text = re.sub(r'\[([^\]]+)\]\[[^\]]+\]', r'\1', text)
        text = re.sub(r'<[^>]+>', '', text)
        text = re.sub(r'[`*_~]+', '', text)
        text = html.unescape(text)
        return re.sub(r'\s+', ' ', text).strip()

    def _make_slug(text: str) -> str:
        slug = re.sub(r'[^a-z0-9]+', '-', text.lower()).strip('-')
        if not slug:
            slug = "section"
        if slug in seen_slugs:
            seen_slugs[slug] += 1
            slug = f"{slug}-{seen_slugs[slug]}"
        else:
            seen_slugs[slug] = 0
        return slug

    for m in re.finditer(r'^(#{2,3})\s+(.+)$', md_text, re.MULTILINE):
        level = len(m.group(1))
        text = _plain_heading_text(m.group(2))
        if not text:
            continue
        headings.append({"level": level, "text": text, "slug": _make_slug(text)})
    if not headings:
        for m in re.finditer(r'^\*\*([^*]+)\*\*\s*$', md_text, re.MULTILINE):
            text = _plain_heading_text(m.group(1)).rstrip(':')
            if 3 < len(text) < 80:
                headings.append({"level": 2, "text": text, "slug": _make_slug(text)})
    return headings


def _apply_heading_ids(report_html: str, headings: List[Dict[str, str]]) -> str:
    """Force rendered h2/h3 IDs to match the generated sidebar links."""
    if not headings:
        return report_html

    soup = BeautifulSoup(report_html, "html.parser")
    rendered_headings = soup.find_all(["h2", "h3"])
    for element, heading in zip(rendered_headings, headings):
        expected_name = f"h{heading['level']}"
        if element.name != expected_name:
            logger.debug(
                "Visual report heading level mismatch: rendered %s for TOC %s",
                element.name,
                expected_name,
            )
        element["id"] = heading["slug"]
    if len(rendered_headings) != len(headings):
        logger.debug(
            "Visual report heading count mismatch: rendered=%s toc=%s",
            len(rendered_headings),
            len(headings),
        )
    return str(soup)


# Overlay buttons shown on each image: reroll (swap for the next unused
# scraped image) + hide (remove and skip on future renders). Reroll is
# wired up in the page script using the embedded spare-image pool.
_IMG_OVERLAY_BTNS = (
    '<button class="img-reroll-btn" type="button" title="Swap for another image">'
    '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="23 4 23 10 17 10"/><path d="M20.49 15a9 9 0 11-2.12-9.36L23 10"/></svg>'
    '</button>'
    '<button class="img-hide-btn" type="button" title="Hide image">'
    '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>'
    '</button>'
)


def _inject_images(report_html: str, images: List[str]) -> Tuple[str, int]:
    """Insert OG images between h2 sections as figures.

    Returns (html, consumed) where ``consumed`` is how many of ``images``
    were actually placed — the rest become the spare pool for reroll.
    """
    if not images:
        return report_html, 0

    # Find positions after closing </h2> + following paragraph
    h2_positions = [m.end() for m in re.finditer(r'</h2>', report_html)]
    if not h2_positions:
        return report_html, 0

    # Insert an image after every 2nd heading (skip first heading = title)
    img_idx = 0
    insert_after = h2_positions[1::2]  # every 2nd h2
    # Work backwards to preserve positions
    for pos in reversed(insert_after):
        if img_idx >= len(images):
            break
        img_url = images[img_idx]
        img_idx += 1
        url_esc = html.escape(img_url)
        figure = (
            f'\n<figure class="section-image" data-img-url="{url_esc}">'
            f'<img src="{url_esc}" alt="" loading="lazy" '
            f'onerror="this.parentElement.style.display=\'none\'">'
            f'{_IMG_OVERLAY_BTNS}'
            f'</figure>\n'
        )
        report_html = report_html[:pos] + figure + report_html[pos:]

    return report_html, img_idx


# ---------------------------------------------------------------------------
# HTML template
# ---------------------------------------------------------------------------

_TEMPLATE = """\
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{title}</title>
<meta name="description" content="{description}">
<meta property="og:title" content="{title}">
<meta property="og:description" content="{description}">
<meta property="og:type" content="article">
{og_image_meta}
<meta name="theme-color" content="#b8543a" media="(prefers-color-scheme: light)">
<meta name="theme-color" content="#131214" media="(prefers-color-scheme: dark)">
<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='75' font-size='75'>O</text></svg>">
<style>
*, *::before, *::after {{ box-sizing: border-box; margin: 0; padding: 0; }}

:root {{
  --font-display: 'Charter', 'Iowan Old Style', Georgia, serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --bg: #fbf9f4;
  --bg-surface: #ffffff;
  --bg-surface-alt: #f1ede4;
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.16);
  --text: #1a1817;
  --text-dim: #5a5651;
  --text-muted: #8a8580;
  --accent: #b8543a;
  --accent-light: #d97a5e;
  --accent-bg: rgba(184,84,58,0.06);
  --gold: #c9952e;
  --gold-bg: rgba(201,149,46,0.09);
  --aurora-a: rgba(184,84,58,0.10);
  --aurora-b: rgba(201,149,46,0.08);
  --aurora-c: rgba(64,98,128,0.07);
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.07);
  --max-w: 760px;
}}

@media (prefers-color-scheme: dark) {{
  :root {{
    --bg: #131214; --bg-surface: #1c1a1e; --bg-surface-alt: #25232a;
    --border: rgba(255,255,255,0.07); --border-strong: rgba(255,255,255,0.16);
    --text: #ece8e2; --text-dim: #a8a39c; --text-muted: #6f6b66;
    --accent: #e88f73; --accent-light: #f4ad95; --accent-bg: rgba(232,143,115,0.09);
    --gold: #e8c05a; --gold-bg: rgba(232,192,90,0.09);
    --aurora-a: rgba(232,143,115,0.13);
    --aurora-b: rgba(232,192,90,0.09);
    --aurora-c: rgba(125,180,224,0.10);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4); --shadow-md: 0 4px 28px rgba(0,0,0,0.55);
  }}
}}

html {{
  scroll-behavior: smooth;
  /* Give smooth-scroll some breathing room so anchors land below the
     fixed toolbar instead of being shoved straight under it. */
  scroll-padding-top: 4rem;
}}
body {{
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 17px;
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  min-height: 100vh;
}}

/* ── Aurora background ─────────────────────────────────
   Slowly-drifting layered blobs in the accent palette. Sits behind
   the content, fixed to the viewport so scrolling doesn't reset the
   composition. Subtle grain on top stops it reading as 'flat CSS'. */
body::before {{
  content: '';
  position: fixed;
  inset: -20vh -20vw;
  z-index: -2;
  background:
    radial-gradient(40vw 50vh at 18% 22%, var(--aurora-a) 0%, transparent 60%),
    radial-gradient(45vw 55vh at 82% 12%, var(--aurora-b) 0%, transparent 65%),
    radial-gradient(55vw 60vh at 50% 88%, var(--aurora-c) 0%, transparent 70%);
  filter: blur(20px);
  animation: aurora-drift 28s ease-in-out infinite alternate;
  pointer-events: none;
}}
body::after {{
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  /* Subtle film-grain — SVG turbulence baked to a data-URL. */
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.32 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.045;
  mix-blend-mode: overlay;
}}
@keyframes aurora-drift {{
  0%   {{ transform: translate3d(0,0,0) scale(1);     }}
  50%  {{ transform: translate3d(2vw,-1vh,0) scale(1.04); }}
  100% {{ transform: translate3d(-1vw,1.5vh,0) scale(1.02); }}
}}
@media (prefers-reduced-motion: reduce) {{
  body::before {{ animation: none; }}
}}

/* ── Toolbar (top-right) ──────────────────────────── */
.toolbar {{
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 100;
  display: flex;
  gap: 0.4rem;
  opacity: 0.7;
  transition: opacity 0.2s;
}}
.toolbar:hover {{ opacity: 1; }}
.toolbar button {{
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--bg-surface);
  color: var(--text);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s;
  position: relative;
}}
.toolbar button:hover {{ background: var(--bg-surface-alt); }}
.toolbar button svg {{ width: 14px; height: 14px; flex-shrink: 0; }}
.toolbar .toast {{
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--text);
  color: var(--bg);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.72rem;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}}
.toolbar .toast.show {{ opacity: 1; }}
.dropdown {{ position: relative; }}
.dropdown-menu {{
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  min-width: 140px;
}}
.dropdown-menu.open {{ display: block; }}
.dropdown-menu button {{
  display: block;
  width: 100%;
  padding: 8px 14px;
  border: none;
  background: none;
  color: var(--text);
  font-family: inherit;
  font-size: 0.8rem;
  text-align: left;
  cursor: pointer;
}}
.dropdown-menu button:hover {{ background: var(--bg-surface-alt); }}

/* ── Hero ──────────────────────────────────────────── */
.hero {{
  position: relative;
  background: transparent;
  color: var(--text);
  padding: 5.5rem 2rem 2.5rem;
  text-align: center;
  overflow: hidden;
}}
.hero::before {{
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 50% 40%, color-mix(in srgb, var(--accent) 10%, transparent) 0%, transparent 70%);
  pointer-events: none;
}}
/* A hair-thin gradient hairline divider under the hero to anchor it
   without putting it on a heavy boxed background. */
.hero::after {{
  content: '';
  position: absolute;
  left: 50%; bottom: 0;
  width: min(60%, 320px);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}}
.hero-label {{
  position: relative;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0.85;
  margin-bottom: 1.4rem;
  font-family: var(--font-body);
}}
.hero h1 {{
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 600;
  font-variation-settings: 'opsz' 120, 'SOFT' 50;
  line-height: 1.15;
  max-width: 720px;
  margin: 0 auto;
  letter-spacing: -0.02em;
  color: var(--text);
}}

/* ── Hero image ───────────────────────────────────── */
.hero-image {{
  max-width: var(--max-w);
  margin: -2rem auto 0;
  position: relative;
  z-index: 1;
  padding: 0 2rem;
}}
.hero-image img {{
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: block;
}}

/* ── Section images ───────────────────────────────── */
.section-image {{
  margin: 1.5rem 0;
  position: relative;
}}
.section-image img {{
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  display: block;
}}

/* ── Per-image hide button ────────────────────────────
   A small X that appears on hover (or always on touch) so users can
   remove irrelevant OG images. Click POSTs the URL to the backend so
   the next render skips it. */
.img-hide-btn {{
  position: absolute;
  top: 10px; right: 10px;
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.55);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, background 0.15s ease, transform 0.05s ease;
  z-index: 2;
  padding: 0;
}}
.hero-image .img-hide-btn {{ top: 14px; right: 2.5rem; }}
/* Reroll sits just to the left of the hide button. */
.img-reroll-btn {{
  position: absolute;
  top: 10px; right: 46px;
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.55);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, background 0.15s ease, transform 0.05s ease;
  z-index: 2;
  padding: 0;
}}
.hero-image .img-reroll-btn {{ top: 14px; right: calc(2.5rem + 36px); }}
.section-image:hover .img-hide-btn,
.section-image:hover .img-reroll-btn,
.hero-image:hover .img-hide-btn,
.hero-image:hover .img-reroll-btn {{ opacity: 1; }}
.img-hide-btn:hover {{ background: var(--accent); }}
.img-reroll-btn:hover {{ background: var(--accent); }}
.img-hide-btn:active,
.img-reroll-btn:active {{ transform: scale(0.92); }}
.img-reroll-btn.spinning svg {{ animation: img-reroll-spin 0.6s linear infinite; }}
.img-reroll-btn:disabled {{ display: none; }}
@keyframes img-reroll-spin {{ to {{ transform: rotate(360deg); }} }}
@media (hover: none) {{
  /* Touch devices have no hover — show the buttons at low opacity always. */
  .img-hide-btn, .img-reroll-btn {{ opacity: 0.7; }}
}}
.section-image.fading,
.hero-image.fading {{
  opacity: 0;
  transform: scale(0.96);
  transition: opacity 0.25s ease, transform 0.25s ease;
}}

/* ── Stats bar ─────────────────────────────────────── */
.stats-bar {{
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 0.9rem 2rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-dim);
}}
.stat {{ display: flex; align-items: center; gap: 0.35rem; }}
.stat-value {{ font-weight: 600; color: var(--text); }}

/* ── Layout ────────────────────────────────────────── */
.layout {{
  display: grid;
  grid-template-columns: 200px 1fr;
  max-width: calc(var(--max-w) + 260px);
  margin: 0 auto;
}}
@media (max-width: 900px) {{
  .layout {{ grid-template-columns: 1fr; }}
  .toc-sidebar {{ display: none; }}
}}

/* ── TOC sidebar ───────────────────────────────────── */
.toc-sidebar {{
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  padding: 3.2rem 0.8rem 2rem 1.4rem;
  border-right: 1px solid var(--border);
  font-size: 0.78rem;
}}
.toc-sidebar nav {{ position: relative; }}
.toc-sidebar nav a {{
  position: relative;
  display: block;
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.42rem 0.7rem 0.42rem 0.85rem;
  margin: 1px 0;
  border-radius: 6px;
  line-height: 1.4;
  letter-spacing: -0.005em;
  transition: color 0.18s ease, background 0.18s ease, padding-left 0.18s ease;
}}
/* Sliding accent indicator on the left edge of each TOC link */
.toc-sidebar nav a::before {{
  content: '';
  position: absolute;
  left: 0; top: 50%;
  width: 2px; height: 0;
  background: var(--accent);
  transform: translateY(-50%);
  border-radius: 1px;
  transition: height 0.18s ease, opacity 0.18s ease;
  opacity: 0;
}}
.toc-sidebar nav a:hover {{
  color: var(--text);
  background: var(--accent-bg);
  padding-left: 1rem;
}}
.toc-sidebar nav a:hover::before {{
  height: 60%;
  opacity: 1;
}}
.toc-sidebar nav a.active {{
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-bg);
}}
.toc-sidebar nav a.active::before {{
  height: 80%;
  opacity: 1;
}}
.toc-sidebar nav a.depth-3 {{
  padding-left: 1.3rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}}
.toc-sidebar nav a.depth-3:hover {{ padding-left: 1.45rem; }}

/* ── Content ───────────────────────────────────────── */
.content {{ max-width: var(--max-w); padding: 3rem 2.5rem 4rem; }}

/* Display headings — Fraunces optical-size driven so they get more
   contrast and personality at the larger end. */
.content h2 {{
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.4vw, 1.85rem);
  font-weight: 600;
  font-variation-settings: 'opsz' 96, 'SOFT' 50;
  margin: 3rem 0 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid transparent;
  border-image: linear-gradient(90deg, var(--accent) 0%, transparent 65%) 1;
  letter-spacing: -0.022em;
  line-height: 1.2;
  color: var(--text);
}}
.content h2:first-child {{ margin-top: 0; }}
.content h3 {{
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 600;
  font-variation-settings: 'opsz' 32;
  margin: 2.2rem 0 0.6rem;
  letter-spacing: -0.015em;
  color: var(--text);
}}
.content h4 {{
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin: 1.6rem 0 0.5rem;
}}
.content p {{ margin-bottom: 1.1rem; hanging-punctuation: first last; }}

/* Drop cap on the very first paragraph of the body — old-school editorial
   touch that anchors the reader. */
.content > p:first-of-type::first-letter,
.content > h2:first-child + p::first-letter {{
  font-family: var(--font-display);
  font-weight: 700;
  font-variation-settings: 'opsz' 144;
  font-size: 3.6em;
  line-height: 0.85;
  float: left;
  margin: 0.15em 0.12em 0 -0.04em;
  color: var(--accent);
}}

.content a {{
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s, color 0.15s;
}}
.content a:hover {{
  text-decoration-color: var(--accent);
  color: var(--accent-light);
}}
.content ul, .content ol {{ margin: 0 0 1.1rem 1.6rem; }}
.content li {{ margin-bottom: 0.4rem; }}
.content li::marker {{ color: var(--accent); }}
.content li > ul, .content li > ol {{ margin-top: 0.4rem; margin-bottom: 0; }}
.content blockquote {{
  position: relative;
  border-left: 3px solid var(--gold);
  background: var(--gold-bg);
  padding: 1.1rem 1.4rem 1.1rem 2.6rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.55;
}}
.content blockquote::before {{
  content: '\\201C';
  position: absolute;
  left: 0.5rem; top: 0.3rem;
  font-family: var(--font-display);
  font-size: 3rem;
  font-style: normal;
  color: var(--gold);
  opacity: 0.5;
  line-height: 1;
}}
.content hr {{ border: none; height: 1px; background: linear-gradient(90deg, transparent, var(--border-strong), transparent); margin: 2rem 0; }}
.content code {{ font-family: var(--font-mono); font-size: 0.86em; background: var(--bg-surface-alt); padding: 0.15em 0.4em; border-radius: 4px; }}
.content pre {{ background: var(--bg-surface-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem 1.5rem; overflow-x: auto; margin: 1.25rem 0; font-size: 0.86rem; line-height: 1.6; }}
.content pre code {{ background: none; padding: 0; }}
.content table {{ width: 100%; border-collapse: collapse; margin: 1.25rem 0; font-size: 0.9rem; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }}
.content th {{ text-align: left; padding: 0.7rem 1rem; background: var(--accent-bg); font-weight: 600; border-bottom: 2px solid var(--border-strong); }}
.content td {{ padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); vertical-align: top; }}
.content tr:last-child td {{ border-bottom: none; }}
.content tr:hover td {{ background: var(--accent-bg); }}

/* ── Sources (collapsible list) ───────────────────── */
.sources-panel {{ margin-top: 3rem; border-top: 2px solid var(--border); padding-top: 1.5rem; }}
.sources-panel details {{ margin: 0; }}
.sources-panel summary {{
  display: flex; align-items: center; gap: 0.5rem;
  cursor: pointer; font-size: 1rem; font-weight: 600;
  color: var(--text); padding: 0.5rem 0; list-style: none;
  user-select: none;
}}
.sources-panel summary::-webkit-details-marker {{ display: none; }}
.sources-panel summary::before {{
  content: '\\25B6'; font-size: 0.65em; color: var(--text-muted);
  transition: transform 0.2s;
}}
.sources-panel details[open] summary::before {{ transform: rotate(90deg); }}
.sources-list {{ padding: 0.5rem 0 0 0.25rem; }}
.sources-list a {{
  display: flex; align-items: baseline; gap: 0.5rem;
  padding: 0.35rem 0; font-size: 0.85rem;
  color: var(--text); text-decoration: none;
  transition: color 0.15s;
}}
.sources-list a:hover {{ color: var(--accent); }}
.sources-list .snum {{
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  min-width: 1.5rem; text-align: right; flex-shrink: 0;
}}
.sources-list .sdomain {{
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  margin-left: auto; flex-shrink: 0;
}}

/* ── Chat-about CTA ────────────────────────────────── */
.chat-cta {{
  margin: 3rem 0 1rem; padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-surface);
}}
.chat-cta-btn {{
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; font-size: 0.95rem; font-weight: 600;
  background: var(--accent); color: #fff;
  border: none; border-radius: 8px; cursor: pointer;
  font-family: inherit;
  transition: filter 0.15s, transform 0.05s;
}}
.chat-cta-btn:hover:not(:disabled) {{ filter: brightness(1.1); }}
.chat-cta-btn:active:not(:disabled) {{ transform: translateY(1px); }}
.chat-cta-btn:disabled {{ opacity: 0.6; cursor: progress; }}
.chat-cta-hint {{
  margin-top: 8px; font-size: 0.8rem; color: var(--text-muted);
}}

/* ── Footer ────────────────────────────────────────── */
.report-footer {{
  text-align: center; padding: 2rem; font-size: 0.75rem;
  color: var(--text-muted); border-top: 1px solid var(--border); margin-top: 2rem;
}}

/* ── Animations ────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {{
  .content h2, .content h3, .content p, .content ul, .content ol,
  .content blockquote, .content table, .content pre, .section-image {{
    animation: fadeUp 0.4s ease both;
  }}
  @keyframes fadeUp {{
    from {{ opacity: 0; transform: translateY(8px); }}
    to   {{ opacity: 1; transform: translateY(0); }}
  }}
}}

/* ── Print ─────────────────────────────────────────── */
@media print {{
  .toc-sidebar, .toolbar {{ display: none !important; }}
  .layout {{ grid-template-columns: 1fr; }}
  .hero {{ -webkit-print-color-adjust: exact; print-color-adjust: exact; }}
}}
{category_css}
</style>
</head>
<body class="{body_class}">

<!-- Toolbar: Export + Restore hidden images -->
<div class="toolbar">
  {restore_btn_html}
  <div class="dropdown">
    <button id="btn-export" title="Export">
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      Export &#9662;
    </button>
    <div class="dropdown-menu" id="export-menu">
      <button id="btn-pdf">Save as PDF</button>
      <button id="btn-html">Download HTML</button>
    </div>
  </div>
</div>

<div class="hero">
  <div class="hero-label">Odysseus &mdash; Deep Research Report</div>
  <h1>{question_html}</h1>
</div>

{hero_image_html}

<div class="stats-bar">
  {stats_html}
</div>

<div class="layout">
  <aside class="toc-sidebar">
    <nav>
      {toc_html}
    </nav>
  </aside>
  <main class="content">
    {report_html}

    {sources_html}

    {chat_cta_html}
  </main>
</div>

<div class="report-footer">
  Generated by Odysseus Deep Research &middot; {timestamp}
</div>

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    headings.forEach(function(h) {{ io.observe(h); }});
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  if (chatBtn) {{
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  const neg = /^(no|none|poor|weak|slow|low|limited|lacking|missing|basic|minimal|✗|❌|N\\/A$)/i;
  const mid = /^(moderate|average|fair|partial|some|decent|okay|mixed|varies|depends)/i;
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    const t = td.textContent.trim();
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    else if (mid.test(t)) td.classList.add('cmp-mid');
  }});
}}
</script>
</body>
</html>
"""


# ---------------------------------------------------------------------------
# Public API
# ---------------------------------------------------------------------------

def _category_css(category: Optional[str]) -> str:
    if not category:
        return ""
    # Per-category palette overrides — applied BEFORE the structural rules so
    # everything that reads --accent / --aurora-* automatically retints. The
    # default (no category) keeps the warm terracotta defined in :root.
    palettes = """
/* ── Category palettes ───────────────────────────────────
   Override the accent + aurora vars per category so each report
   type has a distinct visual identity. */
body.category-product {
  --accent: #2a8a8c;
  --accent-light: #4ab0b2;
  --accent-bg: rgba(42,138,140,0.07);
  --aurora-a: rgba(42,138,140,0.11);
  --aurora-b: rgba(201,149,46,0.06);
  --aurora-c: rgba(64,98,128,0.06);
}
body.category-comparison {
  --accent: #7a4cb8;
  --accent-light: #9d76d0;
  --accent-bg: rgba(122,76,184,0.07);
  --aurora-a: rgba(122,76,184,0.11);
  --aurora-b: rgba(184,84,58,0.05);
  --aurora-c: rgba(64,98,128,0.07);
}
body.category-howto {
  --accent: #3d8a3d;
  --accent-light: #62b162;
  --accent-bg: rgba(61,138,61,0.07);
  --aurora-a: rgba(61,138,61,0.11);
  --aurora-b: rgba(201,149,46,0.07);
  --aurora-c: rgba(42,138,140,0.05);
}
body.category-landscape {
  --accent: #b88a2e;
  --accent-light: #d4a955;
  --accent-bg: rgba(184,138,46,0.08);
  --aurora-a: rgba(184,138,46,0.13);
  --aurora-b: rgba(184,84,58,0.06);
  --aurora-c: rgba(122,76,184,0.05);
}
@media (prefers-color-scheme: dark) {
  body.category-product {
    --accent: #5cc8cb; --accent-light: #8fdde0;
    --accent-bg: rgba(92,200,203,0.10);
    --aurora-a: rgba(92,200,203,0.13);
    --aurora-b: rgba(232,192,90,0.07);
    --aurora-c: rgba(125,180,224,0.08);
  }
  body.category-comparison {
    --accent: #b896e8; --accent-light: #d0b8f0;
    --accent-bg: rgba(184,150,232,0.10);
    --aurora-a: rgba(184,150,232,0.13);
    --aurora-b: rgba(232,143,115,0.06);
    --aurora-c: rgba(125,180,224,0.08);
  }
  body.category-howto {
    --accent: #82c882; --accent-light: #a8dba8;
    --accent-bg: rgba(130,200,130,0.09);
    --aurora-a: rgba(130,200,130,0.12);
    --aurora-b: rgba(232,192,90,0.07);
    --aurora-c: rgba(92,200,203,0.07);
  }
  body.category-landscape {
    --accent: #e6c069; --accent-light: #f0d390;
    --accent-bg: rgba(230,192,105,0.10);
    --aurora-a: rgba(230,192,105,0.15);
    --aurora-b: rgba(232,143,115,0.07);
    --aurora-c: rgba(184,150,232,0.06);
  }
}

/* ── Per-category font pairings ───────────────────────
   Body font shifts between serif (long-form categories) and sans
   (practical/data categories) so each report reads as a different
   publication, not just a re-tinted version of the same template. */

/* Long-form: literary serif for both display and body */
body:not([class*="category-"]),
body.category-landscape {
  --font-body: 'Source Serif 4', 'Iowan Old Style', Georgia, serif;
}

/* Comparison: analytical serif display + clean sans body */
body.category-comparison {
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

/* How-to: friendly geometric sans, top to bottom */
body.category-howto {
  --font-display: 'Manrope', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

/* Product: techy/engineery — IBM Plex Sans display + Inter body */
body.category-product {
  --font-display: 'IBM Plex Sans', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

/* Source Serif sits visually larger than Inter at the same px — pull it
   back one notch for the categories that use it as body so line length
   and rhythm stay comparable across categories. */
body:not([class*="category-"]) body, /* no-op selector, kept for clarity */
body.category-landscape { font-size: 16.5px; }

/* Drop cap looks bad on geometric sans — kill it for those categories */
body.category-product   .content > p:first-of-type::first-letter,
body.category-howto     .content > p:first-of-type::first-letter,
body.category-comparison .content > p:first-of-type::first-letter,
body.category-product   .content > h2:first-child + p::first-letter,
body.category-howto     .content > h2:first-child + p::first-letter,
body.category-comparison .content > h2:first-child + p::first-letter {
  font-size: 1em; float: none; margin: 0; color: inherit;
  font-family: inherit; font-weight: inherit;
}

/* ── Per-category background effects ───────────────
   Each category overrides body::before so the page reads as a
   distinctly-textured surface. Aurora stays the default. */

/* Product → blueprint grid that slowly pans */
body.category-product::before {
  background:
    linear-gradient(to right, var(--aurora-a) 1px, transparent 1px),
    linear-gradient(to bottom, var(--aurora-a) 1px, transparent 1px),
    radial-gradient(70vw 60vh at 50% 50%, var(--aurora-a) 0%, transparent 75%);
  background-size: 56px 56px, 56px 56px, 100% 100%;
  filter: none;
  animation: cat-grid-pan 60s linear infinite;
}
@keyframes cat-grid-pan {
  to { background-position: 56px 56px, 56px 56px, 0 0; }
}

/* Comparison → dot grid + slow opacity pulse */
body.category-comparison::before {
  background:
    radial-gradient(circle, var(--aurora-a) 1.4px, transparent 1.8px),
    radial-gradient(60vw 55vh at 25% 25%, var(--aurora-b) 0%, transparent 65%),
    radial-gradient(60vw 55vh at 75% 75%, var(--aurora-c) 0%, transparent 65%);
  background-size: 26px 26px, 100% 100%, 100% 100%;
  filter: none;
  animation: cat-dot-pulse 14s ease-in-out infinite alternate;
}
@keyframes cat-dot-pulse {
  from { opacity: 0.65; }
  to   { opacity: 1; }
}

/* How-to → flat surface with a very subtle vignette. Drop the flow-lines
   pattern — it competes visually with the step number rails on the
   right-hand side of each H2. The reading should feel like an O'Reilly
   procedure: clean, scannable, no decoration in the way. */
body.category-howto::before {
  background:
    radial-gradient(70vw 70vh at 50% 0%, var(--aurora-a) 0%, transparent 60%),
    radial-gradient(50vw 50vh at 50% 100%, var(--aurora-b) 0%, transparent 65%);
  filter: blur(40px);
  animation: none;
}

/* Landscape → horizontal horizon bands that slowly shift sideways */
body.category-landscape::before {
  background:
    linear-gradient(
      180deg,
      transparent 0%,
      var(--aurora-a) 22%,
      transparent 35%,
      var(--aurora-b) 55%,
      transparent 68%,
      var(--aurora-c) 85%,
      transparent 100%
    );
  background-size: 100% 200%;
  filter: blur(40px);
  animation: cat-horizon-drift 36s ease-in-out infinite alternate;
}
@keyframes cat-horizon-drift {
  0%   { background-position: 0 0; }
  100% { background-position: 0 100%; }
}

@media (prefers-reduced-motion: reduce) {
  body.category-product::before,
  body.category-comparison::before,
  body.category-howto::before,
  body.category-landscape::before {
    animation: none;
  }
}

/* ─────────────────────────────────────────────────────
   PER-CATEGORY STRUCTURAL TREATMENTS
   Each category gets distinctive structural CSS so the page
   reads as a different publication — not just retinted.
   ───────────────────────────────────────────────────── */

/* ── HOWTO: O'Reilly-style numbered procedure ─────── */
body.category-howto .content { counter-reset: howto-step; }
body.category-howto .content h2 {
  counter-increment: howto-step;
  display: flex; align-items: center; gap: 14px;
  border-bottom: none;
  padding-left: 0;
  margin-top: 3.5rem;
}
body.category-howto .content h2::before {
  content: counter(howto-step);
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 30%, transparent);
}
/* Step body gets a colored left rail so you can scan "this is step 1's stuff" */
body.category-howto .content h2 ~ p,
body.category-howto .content h2 ~ ul,
body.category-howto .content h2 ~ ol,
body.category-howto .content h2 ~ pre,
body.category-howto .content h2 ~ blockquote {
  border-left: 2px solid color-mix(in srgb, var(--accent) 25%, transparent);
  padding-left: 1rem;
  margin-left: 4px;
}
body.category-howto .content h2:has(+ *) ~ h2 ~ * { border-left: none; padding-left: 0; margin-left: 0; }
/* Terminal-style code blocks — green $ prompt, monospaced, dark surface */
body.category-howto .content pre {
  background: #1a1a1e;
  color: #d4e4d4;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 8px;
  position: relative;
  padding-left: 2.6rem;
}
body.category-howto .content pre::before {
  content: '$';
  position: absolute;
  left: 1.1rem; top: 1.15rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.86rem;
  opacity: 0.85;
}
body.category-howto .content pre code { color: inherit; }

/* ── LANDSCAPE: editorial briefing with H3 player cards ─ */
body.category-landscape .content h3 {
  /* Each H3 in landscape = a "player" in the field — give it a card frame */
  margin-top: 2.5rem;
  padding: 14px 18px 4px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 4%, transparent);
  border-radius: 0 8px 8px 0;
  font-family: var(--font-display);
  font-size: 1.18rem;
}
body.category-landscape .content h3 + p {
  margin-top: 0;
  padding: 0 18px 14px;
  background: color-mix(in srgb, var(--accent) 4%, transparent);
  border-left: 3px solid var(--accent);
  margin-left: 0;
  border-radius: 0 0 8px 0;
}
/* Pull-quote treatment for any standalone blockquote */
body.category-landscape .content blockquote {
  font-size: 1.2rem;
  line-height: 1.5;
  max-width: 90%;
  margin: 2rem auto;
  text-align: center;
  border-left: none;
  border-top: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  background: transparent;
  border-radius: 0;
  padding: 1.5rem 1rem;
  font-style: italic;
}
body.category-landscape .content blockquote::before {
  display: none;
}

/* ── COMPARISON: lab-report tables with winner badges ─ */
body.category-comparison .content {
  font-feature-settings: 'tnum' on, 'ss01';  /* tabular numerals for tables */
}
body.category-comparison .content table {
  font-size: 0.92rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}
body.category-comparison .content th {
  background: color-mix(in srgb, var(--accent) 18%, var(--bg-surface));
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  font-weight: 700;
}
body.category-comparison .content td:first-child {
  font-weight: 600;
  background: color-mix(in srgb, var(--accent) 6%, transparent);
}
/* The first H3 inside a comparison report often names the recommended pick */
body.category-comparison .content h3:first-of-type::after {
  content: 'Pick';
  display: inline-block;
  margin-left: 10px;
  padding: 2px 10px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 999px;
  vertical-align: middle;
}

/* ── PRODUCT: spec-sheet cards for each H3 ─────────── */
body.category-product .content h3 {
  /* Each product gets a spec-card frame — bordered, slight bg lift */
  margin-top: 2.4rem;
  padding: 16px 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
  background: var(--bg-surface);
  border-radius: 10px;
  display: flex; align-items: baseline; gap: 10px;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
body.category-product .content h3::after {
  /* small "spec" tag on each product heading */
  content: 'SPEC';
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 3px 8px;
  border-radius: 4px;
}
body.category-product .content h3 + p,
body.category-product .content h3 + ul,
body.category-product .content h3 + table {
  margin-top: 0.8rem;
  padding-left: 4px;
}
"""
    styles = {
        "product": """
/* Product category */
.category-product .content h3 {
  display:flex; align-items:baseline; gap:8px;
  border-bottom:1px solid var(--border); padding-bottom:6px;
}
.category-product .content table {
  width:100%; border-collapse:collapse; margin:1.2em 0; font-size:0.92em;
}
.category-product .content table th {
  background:var(--accent); color:#fff; padding:8px 12px; text-align:left;
}
.category-product .content table td { padding:8px 12px; border-bottom:1px solid var(--border); }
.category-product .content table tr:nth-child(even) td { background:var(--bg-surface); }
.category-product .content ul { columns:2; column-gap:2em; }
@media (max-width:600px) { .category-product .content ul { columns:1; } }
.category-product .content a[href*="amazon"],
.category-product .content a[href*="ebay"],
.category-product .content a[href*="shop"],
.category-product .content a[href*="buy"] {
  display:inline-block; padding:3px 10px; border-radius:4px;
  background:var(--accent); color:#fff; text-decoration:none; font-size:0.85em; margin:2px 4px;
}
.quick-links-bar {
  display:flex; flex-wrap:wrap; gap:6px; padding:12px 0; margin-bottom:12px;
  border-bottom:1px solid var(--border);
}
.quick-link {
  padding:5px 12px; border-radius:16px; font-size:0.82em; text-decoration:none;
  border:1px solid var(--border); color:var(--text); transition:all 0.15s;
  white-space:nowrap;
}
.quick-link:hover {
  background:var(--accent); color:#fff; border-color:var(--accent);
}
""",
        "comparison": """
/* Comparison category */
.category-comparison .content table {
  width:100%; border-collapse:collapse; margin:1.2em 0;
}
.category-comparison .content table th {
  background:var(--accent); color:#fff; padding:10px 14px;
  text-align:center; font-weight:600; position:sticky; top:0;
}
.category-comparison .content table td {
  padding:10px 14px; border-bottom:1px solid var(--border); text-align:center;
}
.category-comparison .content table tr:nth-child(even) td { background:var(--bg-surface); }
.category-comparison .content table td:first-child {
  text-align:left; font-weight:500; background:color-mix(in srgb, var(--accent) 8%, transparent);
}
.category-comparison .content table td.cmp-pos {
  color:#2e7d32; font-weight:600;
  background:color-mix(in srgb, #4caf50 10%, transparent);
}
.category-comparison .content table td.cmp-neg {
  color:#c62828; font-weight:600;
  background:color-mix(in srgb, #f44336 8%, transparent);
}
.category-comparison .content table td.cmp-mid {
  color:#e68a00;
  background:color-mix(in srgb, #ffa726 8%, transparent);
}
.category-comparison .content h2 ~ p strong:first-child {
  display:inline-block; padding:2px 8px; border-radius:3px;
  background:color-mix(in srgb, var(--accent) 15%, transparent); font-size:0.9em;
}
""",
        "howto": """
/* How-to category */
.category-howto .content h2 {
  counter-increment:step-counter;
}
.category-howto .content h2::before {
  content:counter(step-counter);
  display:inline-flex; align-items:center; justify-content:center;
  width:28px; height:28px; border-radius:50%;
  background:var(--accent); color:#fff; font-size:0.8em; font-weight:700;
  margin-right:10px; flex-shrink:0;
}
.category-howto .content { counter-reset:step-counter; }
.category-howto .content blockquote {
  border-left:3px solid var(--accent); background:color-mix(in srgb, var(--accent) 8%, transparent);
  padding:12px 16px; border-radius:0 6px 6px 0; margin:1em 0;
}
.category-howto .content blockquote strong:first-child {
  display:inline-block; margin-bottom:4px; text-transform:uppercase;
  font-size:0.82em; letter-spacing:0.5px;
}
.category-howto .content h2#quick-guide + ol,
.category-howto .content h2#quick-guide ~ ol:first-of-type {
  background:color-mix(in srgb, var(--accent) 8%, transparent);
  border:1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius:8px; padding:14px 14px 14px 32px; font-size:0.95em; line-height:1.8;
}
.category-howto .content h2#quick-guide {
  counter-increment:none;
}
.category-howto .content h2#quick-guide::before {
  content:'\\26A1'; background:none; width:auto; height:auto; margin-right:6px;
}
""",
        "landscape": """
/* Landscape category */
.category-landscape .content h3 {
  display:flex; align-items:center; gap:8px;
  padding:8px 0; border-bottom:1px solid var(--border);
}
.category-landscape .content table {
  width:100%; border-collapse:collapse; margin:1em 0; font-size:0.92em;
}
.category-landscape .content table th {
  background:var(--accent); color:#fff; padding:8px 12px; text-align:left;
}
.category-landscape .content table td { padding:8px 12px; border-bottom:1px solid var(--border); }
.category-landscape .content table tr:nth-child(even) td { background:var(--bg-surface); }
.category-landscape .content blockquote {
  border-left:3px solid var(--gold, #d4a73a);
  background:color-mix(in srgb, var(--gold, #d4a73a) 8%, transparent);
  padding:10px 14px; border-radius:0 6px 6px 0;
}
""",
        "factcheck": """
/* Fact-check category */
.category-factcheck .hero {
  background:linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.category-factcheck .content h2:first-of-type {
  font-size:1.4em; text-align:center; padding:16px 0; border:none;
  background:color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius:8px; margin:1em 0;
}
.category-factcheck .content blockquote {
  position:relative; padding-left:20px;
}
.category-factcheck .content h2 ~ h3 {
  padding:6px 10px; border-radius:4px;
  border-left:3px solid var(--accent);
}
.category-factcheck .content strong:only-child {
  display:inline-block; padding:4px 12px; border-radius:4px;
  font-size:1.1em;
}
""",
    }
    # Always emit the per-category palette block when ANY category is set —
    # it contains body.category-X scoped rules so it only re-skins the page
    # for the matching category. The legacy `styles[category]` block adds
    # structural CSS specific to that one type.
    return palettes + styles.get(category, "")


_GENERIC_HEADINGS = {
    "report", "deep research report", "research",
    "executive summary", "summary", "tl;dr",
    "introduction", "overview", "abstract",
    "findings", "key findings", "results",
    "conclusion", "conclusions", "table of contents",
}


def _extract_report_title(markdown_text: str, fallback: str):
    """Pull a real title from the report's first heading rather than reusing
    the raw user query. Returns (title, markdown_with_title_stripped).

    Falls back to the query when no heading is present. Skips generic
    placeholders ("Executive Summary", "Introduction", etc.) and tries the
    next heading. If the chosen title was the report's own top heading, that
    heading is removed from the markdown so it doesn't duplicate the hero h1.
    """
    if not markdown_text:
        return fallback, markdown_text

    # Walk through headings (h1 first, then h2 anywhere) and use the first
    # non-generic one. Track the chosen match so we can strip it from the body.
    candidates = []
    for level, pattern in ((1, r'^# +(.+?)\s*$'), (2, r'^## +(.+?)\s*$')):
        for m in re.finditer(pattern, markdown_text, re.MULTILINE):
            cand = m.group(1).strip().rstrip('#').strip()
            if cand and cand.lower() not in _GENERIC_HEADINGS:
                candidates.append((level, m, cand))

    # Prefer h1 over h2; among same-level, prefer the earliest.
    candidates.sort(key=lambda t: (t[0], t[1].start()))
    if candidates:
        _level, match, title = candidates[0]
        stripped = markdown_text[:match.start()] + markdown_text[match.end():]
        return title, stripped.lstrip()
    return fallback, markdown_text


def generate_visual_report(
    question: str,
    report_markdown: str,
    sources: Optional[List[Dict]] = None,
    stats: Optional[Dict] = None,
    category: Optional[str] = None,
    session_id: Optional[str] = None,
    hidden_images: Optional[List[str]] = None,
) -> str:
    sources = sources or []
    stats = stats or {}
    hidden_images_set = set(hidden_images or [])

    # Strip thinking artifacts
    report_markdown = strip_thinking(report_markdown)

    # Use the report's first heading as the title (synthesized by the LLM)
    # rather than the raw user query. Fall back to the query if absent.
    synthesized, report_markdown = _extract_report_title(report_markdown, question)
    title_text = synthesized[:120] + ("..." if len(synthesized) > 120 else "")

    # Promote bold-only lines to ## headings if no markdown headings exist
    if not re.search(r'^#{2,3}\s+', report_markdown, re.MULTILINE):
        report_markdown = re.sub(
            r'^\*\*([^*]+)\*\*\s*$',
            lambda m: f'## {m.group(1).strip()}',
            report_markdown,
            flags=re.MULTILINE,
        )

    report_html = _md_to_html(report_markdown)

    headings = _extract_headings(report_markdown)
    report_html = _apply_heading_ids(report_html, headings)

    # Collect all OG images from sources (skip icons, tiny images, known junk)
    _IMAGE_BLOCKLIST = {
        "cdn.shopify.com/s/files/1/0179/4388/7926/files/icon.png",
    }
    _seen_images = set()
    all_images = []
    for s in sources:
        img = s.get("image", "")
        if (img and img.startswith("https://")
            and img not in _seen_images
            and img not in hidden_images_set
            and not img.endswith((".svg", ".ico", ".gif"))
            and not any(b in img for b in _IMAGE_BLOCKLIST)
            and "/icon" not in img.lower()
            and "/logo" not in img.lower()
            and "/favicon" not in img.lower()):
            _seen_images.add(img)
            all_images.append(img)

    # Hero image = first available. data-img-url drives the per-image hide
    # button rendered by the script at the bottom of the page.
    hero_image_html = ""
    if all_images:
        hero_url = html.escape(all_images[0])
        hero_image_html = (
            f'<div class="hero-image" data-img-url="{hero_url}">'
            f'<img src="{hero_url}" alt="" loading="lazy" '
            f'onerror="this.parentElement.style.display=\'none\'">'
            f'{_IMG_OVERLAY_BTNS}'
            f'</div>'
        )

    # Product quick-links bar
    if category == "product" and headings:
        product_headings = [h for h in headings if h["level"] == 3]
        if product_headings:
            pills = " ".join(
                f'<a href="#{h["slug"]}" class="quick-link">{html.escape(h["text"][:40])}</a>'
                for h in product_headings
            )
            report_html = f'<div class="quick-links-bar">{pills}</div>\n' + report_html

    # Inject remaining images between sections. Whatever isn't placed (hero
    # took [0], sections took the next `consumed`) becomes the spare pool the
    # reroll button draws from to swap out an irrelevant image in-page.
    section_pool = all_images[1:]
    report_html, _consumed = _inject_images(report_html, section_pool)
    spare_images = section_pool[_consumed:]

    # Build TOC
    toc_lines = []
    for h in headings:
        depth_class = f"depth-{h['level']}"
        toc_lines.append(
            f'<a href="#{h["slug"]}" class="{depth_class}">{html.escape(h["text"])}</a>'
        )
    toc_html = "\n      ".join(toc_lines) if toc_lines else ""

    # Build stats bar
    stat_items = []
    for key, label in [("Duration", "Duration"), ("Rounds", "Rounds"), ("Queries", "Queries"), ("URLs", "URLs Analyzed"), ("Model", "Model"), ("Search", "Search")]:
        val = stats.get(key)
        if val is not None:
            stat_items.append(
                f'<div class="stat"><span class="stat-value">{html.escape(str(val))}</span> {html.escape(label)}</div>'
            )
    stats_html = "\n  ".join(stat_items)

    # Build sources panel — compact collapsible list
    sources_html = ""
    if sources:
        items = []
        for i, s in enumerate(sources, 1):
            url = s.get("url", "")
            title = html.escape(s.get("title", "") or url)
            domain = ""
            try:
                domain = urlparse(url).hostname or ""
                if domain.startswith("www."):
                    domain = domain[4:]
            except Exception:
                domain = url
            items.append(
                f'<a href="{html.escape(url)}" target="_blank" rel="noopener noreferrer">'
                f'<span class="snum">{i}.</span>'
                f'<span>{title}</span>'
                f'<span class="sdomain">{html.escape(domain)}</span>'
                f'</a>'
            )
        sources_html = (
            '<div class="sources-panel">\n'
            '<details>\n'
            f'<summary>Sources ({len(sources)})</summary>\n'
            '<div class="sources-list">\n'
            + "\n".join(items)
            + "\n</div>\n</details>\n</div>"
        )

    timestamp = datetime.now().strftime("%B %d, %Y at %H:%M")

    # Build description for OG/meta tags (first 160 chars of plain text)
    desc_text = re.sub(r'[#*_\[\]()]', '', report_markdown)[:160].strip()
    og_image_meta = ""
    if all_images:
        og_image_meta = f'<meta property="og:image" content="{html.escape(all_images[0])}">'

    chat_cta_html = ""
    if session_id:
        chat_cta_html = (
            '<div class="chat-cta">'
            '<button id="btn-chat-about" class="chat-cta-btn" '
            f'data-research-id="{html.escape(session_id)}">'
            '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" '
            'stroke-width="2" stroke-linecap="round" stroke-linejoin="round" '
            'width="18" height="18">'
            '<path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>'
            '</svg>'
            '<span>Discuss</span>'
            '</button>'
            '<div class="chat-cta-hint">Opens a new chat with this report as context.</div>'
            '</div>'
        )

    # "Restore hidden images" toolbar button — only render if there are any
    # hidden images on this research AND we have a session_id (needed for
    # the POST endpoint).
    restore_btn_html = ""
    if session_id and hidden_images_set:
        restore_btn_html = (
            '<button id="btn-restore-images" type="button" '
            f'title="Restore {len(hidden_images_set)} hidden image'
            f'{"" if len(hidden_images_set) == 1 else "s"}">'
            '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" '
            'stroke-width="2" stroke-linecap="round" stroke-linejoin="round">'
            '<path d="M1 4v6h6"/><path d="M3.51 15a9 9 0 1 0 2.13-9.36L1 10"/>'
            '</svg>'
            f'Show hidden ({len(hidden_images_set)})'
            '</button>'
        )

    return _TEMPLATE.format(
        title=html.escape(title_text),
        description=html.escape(desc_text),
        og_image_meta=og_image_meta,
        question_html=html.escape(synthesized),
        hero_image_html=hero_image_html,
        stats_html=stats_html,
        toc_html=toc_html,
        report_html=report_html,
        sources_html=sources_html,
        chat_cta_html=chat_cta_html,
        restore_btn_html=restore_btn_html,
        timestamp=timestamp,
        category_css=_category_css(category),
        body_class=f"category-{category}" if category else "",
        session_id_js=json_dumps_str(session_id or ""),
        spare_images_js=_json_for_script(spare_images),
    )


def _json_for_script(value) -> str:
    """JSON-encode a value safe to embed inside a <script> block.

    json.dumps doesn't escape '/', so a string containing the literal
    substring '</script>' would terminate the script element early.
    Escape the closing slash to keep the inline JSON inert as HTML.
    """
    return json.dumps(value).replace("</", "<\\/")


def json_dumps_str(s: str) -> str:
    """JSON-encode a string so it's safe to embed inside a <script> block."""
    return _json_for_script(s)
