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BOS_AI / app.py
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"""
BOS AI Training Platform
A guided, module based course on using AI at BOS Security, delivered as a
HuggingFace Gradio Space.
Content: modules.py (lessons and takeaways), quizzes.py (knowledge checks),
teams.py (tools by team), figures.py (SVG diagrams). Logo: logo.png.
Pages: 0 = Overview, 1..N = modules, N+1 = Tools by team.
Progress is kept per browser session (gr.State), not stored server side.
"""

import base64
import html
import re
from pathlib import Path

import gradio as gr
from modules import MODULES, IT_HELP
from quizzes import QUIZZES
from teams import TEAMS, TEAMS_INTRO
from figures import FIGURES, TEAM_FIGURE
from videos import VIDEOS, LINKS, TEAM_LINKS

# Palette sampled from the BOS logo, teal as the single accent
BLUE = "#15516B"
BLUE_DEEP = "#0E3A4D"
TEAL = "#13A89E"
TEAL_DEEP = "#0E7F78"
INK = "#1B2430"
MUTED = "#61707E"
PAPER = "#FFFFFF"
WASH = "#F3F6F9"
RULE = "#E1E8ED"
MISS = "#C0563A"

LOGO_PATH = Path(__file__).with_name("logo.png")
LOGO_SRC = ""
if LOGO_PATH.exists():
    LOGO_SRC = "data:image/png;base64," + base64.b64encode(LOGO_PATH.read_bytes()).decode()

N = len(MODULES)
HOME, TEAM_PAGE = 0, N + 1
MAXQ = max(len(q) for q in QUIZZES)
TOTAL_Q = sum(len(q) for q in QUIZZES)


def _minutes(m):
    words = sum(len(re.sub(r"<[^>]+>", " ", s["body"]).split()) for s in m["sections"])
    return max(3, round(words / 200) + 1)


MINUTES = [_minutes(m) for m in MODULES]

CSS = f"""
:root {{ --blue: {BLUE}; --blue-deep: {BLUE_DEEP}; --teal: {TEAL}; --teal-deep: {TEAL_DEEP}; --ink: {INK}; --muted: {MUTED};
         --paper: {PAPER}; --wash: {WASH}; --rule: {RULE}; --miss: {MISS};
         --shadow: 0 1px 2px rgba(14,58,77,.05), 0 8px 24px -12px rgba(14,58,77,.18); }}
* {{ font-family: Arial, Helvetica, sans-serif !important; }}
body, .gradio-container {{ background: var(--wash) !important; color: var(--ink); }}
.gradio-container {{ max-width: 1320px !important; margin: 0 auto !important; padding: 18px 22px 64px !important; }}
footer {{ display: none !important; }}
.gradio-container .block, .gradio-container .form {{ box-shadow: none; }}
@keyframes rise {{ from {{ opacity: 0; transform: translateY(8px); }} to {{ opacity: 1; transform: none; }} }}
@media (prefers-reduced-motion: reduce) {{ *, *::before, *::after {{ animation: none !important; transition: none !important; }} }}
/* Top bar */
.topbar {{ display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
           background: var(--paper); border: 1px solid var(--rule); border-radius: 16px; padding: 14px 22px; box-shadow: var(--shadow); }}
.topbar .brand {{ display: flex; align-items: center; gap: 18px; }}
.topbar img {{ height: 46px; width: auto; display: block; }}
.topbar .divider {{ width: 1px; height: 38px; background: var(--rule); }}
.topbar h1 {{ margin: 0; font-size: 19px; font-weight: 700; color: var(--blue); letter-spacing: -0.01em; }}
.topbar .tag {{ margin: 2px 0 0; font-size: 13px; color: var(--muted); }}
.topbar .right {{ display: flex; align-items: center; gap: 12px; }}
.topbar .tool {{ font-size: 13px; color: var(--muted); padding: 8px 14px; border: 1px solid var(--rule); border-radius: 999px; background: var(--wash); }}
.topbar .tool b {{ color: var(--blue); }}
.rail .pct {{ margin: 12px 4px 0; text-align: center; font-size: 13px; font-weight: 700; color: var(--teal-deep); padding: 9px 14px; border-radius: 10px; background: #E7F6F4; }}
.track {{ height: 5px; background: var(--rule); border-radius: 999px; overflow: hidden; margin: 12px 6px 6px; }}
.track div {{ height: 100%; background: linear-gradient(90deg, var(--teal), var(--teal-deep)); border-radius: 999px; transition: width .45s cubic-bezier(.2,.8,.2,1); }}
/* Rail */
.rail {{ background: var(--paper) !important; border: 1px solid var(--rule) !important; border-radius: 16px !important; box-shadow: var(--shadow);
         padding: 12px 10px 14px !important; position: sticky; top: 16px; align-self: flex-start; gap: 3px !important; }}
.rail .rail-head {{ padding: 6px 12px 10px; font-size: 12.5px; color: var(--muted); }}
.rail .rail-sub {{ padding: 14px 12px 6px; font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--rule); margin-top: 8px; }}
.rail button {{ width: 100%; justify-content: flex-start !important; text-align: left !important; padding: 11px 12px !important; margin: 0 !important;
                border-radius: 10px !important; font-size: 14.5px !important; line-height: 1.35 !important; font-weight: 400 !important; white-space: normal !important;
                transition: background .15s ease, color .15s ease, transform .1s ease; }}
.rail button.secondary {{ background: transparent !important; border: 1px solid transparent !important; color: var(--ink) !important; box-shadow: none !important; }}
.rail button.secondary:hover {{ background: var(--wash) !important; }}
.rail button.primary {{ background: #E7F6F4 !important; border: 1px solid #C6EBE7 !important; color: var(--blue) !important; font-weight: 700 !important; box-shadow: none !important; }}
.rail button.stop {{ background: transparent !important; border: 1px solid transparent !important; color: var(--teal-deep) !important; box-shadow: none !important; }}
.rail button.stop:hover {{ background: var(--wash) !important; }}
.rail button:active {{ transform: scale(.985); }}
.rail button:focus-visible {{ outline: 2px solid var(--teal) !important; outline-offset: 2px; }}
/* Cards shared */
.card {{ background: var(--paper); border: 1px solid var(--rule); border-radius: 16px; box-shadow: var(--shadow); animation: rise .3s ease both; }}
/* Overview */
.hero {{ display: grid; grid-template-columns: 1fr 220px; gap: 32px; align-items: center; padding: 44px 52px;
         background: linear-gradient(135deg, var(--blue-deep) 0%, var(--blue) 55%, #17667f 100%); color: #fff; border-color: transparent; }}
.hero .eyebrow {{ font-size: 13px; color: #A9D8D3; font-weight: 700; margin: 0 0 10px; }}
.hero h2 {{ font-size: 40px; line-height: 1.08; margin: 0 0 14px; letter-spacing: -0.02em; color: #fff; }}
.hero p {{ font-size: 17px; line-height: 1.55; color: #D5E3EA; margin: 0 0 22px; max-width: 58ch; }}
.hero .stats {{ display: flex; gap: 26px; flex-wrap: wrap; }}
.hero .stat b {{ display: block; font-size: 22px; color: #fff; }}
.hero .stat span {{ font-size: 13px; color: #A9C4D0; }}
.hero .ring {{ display: flex; flex-direction: column; align-items: center; gap: 10px; }}
.hero .ring svg {{ width: 160px; height: 160px; }}
.hero .ring .label {{ font-size: 13px; color: #A9D8D3; }}
.resume {{ display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 24px; margin-top: 16px; border-left: 5px solid var(--teal); }}
.resume .t {{ font-size: 13px; color: var(--muted); margin: 0 0 3px; }}
.resume .n {{ font-size: 18px; font-weight: 700; color: var(--blue); margin: 0; }}
.resume button {{ background: var(--teal); color: #fff; border: none; border-radius: 10px; padding: 12px 20px; font-weight: 700; font-size: 14px; cursor: pointer; white-space: nowrap; transition: background .15s ease, transform .1s ease; }}
.resume button:hover {{ background: var(--teal-deep); }}
.resume button:active {{ transform: scale(.98); }}
.grid-head {{ display: flex; align-items: baseline; justify-content: space-between; margin: 30px 4px 14px; }}
.grid-head h3 {{ font-size: 20px; color: var(--blue); margin: 0; }}
.grid-head span {{ font-size: 13.5px; color: var(--muted); }}
.mgrid {{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }}
.mcard {{ position: relative; display: flex; flex-direction: column; gap: 10px; padding: 22px 22px 20px; background: var(--paper); border: 1px solid var(--rule);
          border-radius: 16px; box-shadow: var(--shadow); cursor: pointer; text-align: left; font: inherit; color: var(--ink);
          transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; animation: rise .3s ease both; }}
.mcard:hover {{ transform: translateY(-3px); border-color: #BFE3DF; box-shadow: 0 2px 4px rgba(14,58,77,.05), 0 16px 32px -14px rgba(14,58,77,.25); }}
.mcard:focus-visible {{ outline: 2px solid var(--teal); outline-offset: 2px; }}
.mcard .row {{ display: flex; align-items: center; justify-content: space-between; }}
.mcard .num {{ width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: var(--blue); color: #fff; font-weight: 700; font-size: 15px; }}
.mcard.done .num {{ background: var(--teal); }}
.mcard .status {{ font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; background: var(--wash); color: var(--muted); }}
.mcard.done .status {{ background: #E7F6F4; color: var(--teal-deep); }}
.mcard.required .status.req {{ background: var(--blue); color: #fff; }}
.mcard h4 {{ margin: 6px 0 0; font-size: 18px; line-height: 1.25; color: var(--blue); letter-spacing: -0.01em; }}
.mcard p {{ margin: 0; font-size: 14.5px; line-height: 1.5; color: var(--muted); flex: 1; }}
.mcard .foot {{ display: flex; justify-content: space-between; font-size: 12.5px; color: var(--muted); padding-top: 12px; border-top: 1px solid var(--rule); }}
.mcard .foot b {{ color: var(--teal-deep); font-weight: 700; }}
.mcard.ref {{ background: linear-gradient(180deg, #F7FBFB, #EEF7F6); }}
/* Reader */
.reader {{ padding: 46px 64px 38px; }}
.reader .meta {{ display: flex; align-items: center; gap: 12px; margin-bottom: 16px; font-size: 13px; color: var(--muted); }}
.pill {{ display: inline-block; padding: 4px 11px; border-radius: 999px; font-weight: 700; font-size: 12px; background: #E7F6F4; color: var(--teal-deep); }}
.pill.required {{ background: var(--blue); color: #fff; }}
.pill.done {{ background: var(--teal); color: #fff; }}
.reader h2 {{ font-size: 36px; line-height: 1.1; color: var(--blue); margin: 0 0 12px; letter-spacing: -0.02em; }}
.reader .summary {{ font-size: 18.5px; color: var(--muted); margin: 0 0 34px; padding-bottom: 26px; border-bottom: 1px solid var(--rule); max-width: 62ch; line-height: 1.45; }}
.reader h3 {{ font-size: 21px; color: var(--blue); margin: 38px 0 12px; letter-spacing: -0.01em; }}
.reader h3:first-of-type {{ margin-top: 0; }}
.reader p {{ font-size: 17px; line-height: 1.68; margin: 0 0 15px; max-width: 68ch; color: var(--ink); }}
.reader p b {{ color: var(--blue); }}
.fig {{ margin: 24px 0 30px; padding: 24px 26px 16px; background: var(--wash); border: 1px solid var(--rule); border-radius: 14px; max-width: 760px; }}
.fig svg {{ width: 100%; height: auto; display: block; }}
.fig figcaption {{ margin-top: 12px; font-size: 13.5px; color: var(--muted); line-height: 1.45; }}
.takeaways {{ margin-top: 44px; padding: 26px 30px; border-radius: 14px; background: linear-gradient(135deg, #EEF7F6, #F7FBFB); border: 1px solid #CFEAE7; max-width: 760px; }}
.takeaways h3 {{ margin: 0 0 14px !important; font-size: 17px !important; color: var(--teal-deep) !important; }}
.takeaways ol {{ margin: 0; padding-left: 0; list-style: none; counter-reset: t; }}
.takeaways li {{ counter-increment: t; display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: start; font-size: 16px; line-height: 1.55; margin-bottom: 10px; color: var(--ink); }}
.takeaways li::before {{ content: counter(t); width: 26px; height: 26px; border-radius: 8px; background: var(--teal); color: #fff; font-weight: 700; font-size: 13px; display: grid; place-items: center; margin-top: 1px; }}
.help {{ margin-top: 22px; padding: 18px 22px; background: var(--wash); border-radius: 12px; border-left: 4px solid var(--blue); max-width: 760px; }}
.help p {{ margin: 0; max-width: none; font-size: 15px; }}
.help p b {{ color: var(--blue); }}
/* Watch panel */
.watch {{ margin: 0 0 36px; padding: 22px 24px 20px; background: linear-gradient(180deg, #F7FBFB, var(--wash)); border: 1px solid var(--rule); border-radius: 14px; max-width: 760px; }}
.watch .wh {{ display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; }}
.watch .wh h3 {{ margin: 0 !important; font-size: 17px !important; color: var(--teal-deep) !important; }}
.watch .wh span {{ font-size: 13px; color: var(--muted); }}
.watch .frame {{ position: relative; width: 100%; padding-top: 56.25%; border-radius: 12px; overflow: hidden; background: #0E3A4D; box-shadow: 0 10px 28px -14px rgba(14,58,77,.45); }}
.watch .frame iframe {{ position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }}
.watch .wt {{ margin: 14px 0 4px; font-size: 16px; font-weight: 700; color: var(--blue); }}
.watch .wb {{ margin: 0; font-size: 14.5px; line-height: 1.55; color: var(--ink); max-width: none; }}
.watch .ws {{ margin: 8px 0 0; font-size: 12.5px; color: var(--muted); max-width: none; }}
.watch .ws a {{ color: var(--teal-deep); text-decoration: none; font-weight: 700; }}
.watch + .watch {{ margin-top: -18px; }}
/* Further learning cards */
.more {{ margin-top: 26px; max-width: 760px; }}
.more h3 {{ font-size: 17px !important; color: var(--blue) !important; margin: 0 0 12px !important; }}
.more .lgrid {{ display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }}
.more a.lcard {{ display: block; padding: 16px 18px; border: 1px solid var(--rule); border-radius: 12px; background: var(--paper); text-decoration: none; color: var(--ink);
                 transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease; }}
.more a.lcard:hover {{ border-color: #BFE3DF; transform: translateY(-2px); box-shadow: var(--shadow); }}
.more a.lcard .lt {{ font-size: 15px; font-weight: 700; color: var(--blue); margin: 0 0 3px; max-width: none; }}
.more a.lcard .lm {{ font-size: 12.5px; color: var(--teal-deep); font-weight: 700; margin: 0 0 8px; max-width: none; }}
.more a.lcard .lb {{ font-size: 14px; line-height: 1.5; color: var(--muted); margin: 0; max-width: none; }}
@media (max-width: 720px) {{ .more .lgrid {{ grid-template-columns: 1fr; }} }}
/* Quiz */
.quiz {{ background: var(--paper) !important; border: 1px solid var(--rule) !important; border-radius: 16px !important; box-shadow: var(--shadow);
         padding: 30px 40px 28px !important; margin-top: 16px; gap: 4px !important; }}
.quiz .qhead {{ display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 8px; }}
.quiz .qhead h3 {{ font-size: 21px; color: var(--blue); margin: 0; }}
.quiz .qhead span {{ font-size: 13px; color: var(--muted); }}
.quiz .qsub {{ color: var(--muted); font-size: 15px; margin: 0 0 8px; max-width: 70ch; }}
.quiz, .quiz .block, .quiz .form, .quiz fieldset, .quiz .wrap {{ background: var(--paper) !important; color: var(--ink) !important; }}
.quiz .block, .quiz .form {{ border: none !important; box-shadow: none !important; padding: 12px 0 6px !important; margin: 0 !important; }}
.quiz fieldset {{ border: none !important; padding: 0 !important; margin: 0 !important; }}
.quiz span[data-testid="block-info"], .quiz .block > label > span, .quiz legend {{ font-size: 16.5px !important; font-weight: 700 !important; color: var(--ink) !important;
                                                                                 background: transparent !important; margin-bottom: 10px !important; display: block; line-height: 1.4; }}
.quiz .wrap {{ display: flex; flex-direction: column; gap: 7px !important; }}
.quiz .wrap label {{ display: flex !important; align-items: center; gap: 12px; padding: 12px 15px !important; border: 1px solid var(--rule) !important; border-radius: 10px !important;
                      background: var(--paper) !important; cursor: pointer; font-size: 15px; box-shadow: none !important; transition: border-color .12s ease, background .12s ease, transform .08s ease; }}
.quiz .wrap label:hover {{ border-color: var(--teal) !important; background: #FAFDFD !important; }}
.quiz .wrap label:active {{ transform: scale(.995); }}
.quiz .wrap label.selected {{ border-color: var(--teal) !important; background: #E7F6F4 !important; }}
.quiz .wrap label, .quiz .wrap label span, .quiz .wrap label * {{ color: var(--ink) !important; }}
.quiz .wrap label.selected span {{ color: var(--blue) !important; font-weight: 700; }}
.quiz .wrap label input[type="radio"] {{ appearance: auto !important; -webkit-appearance: radio !important; width: 18px; height: 18px; margin: 0; accent-color: var(--teal);
                                          background: #fff !important; border: 1px solid var(--muted) !important; border-radius: 50% !important; box-shadow: none !important; }}
.quiz .check {{ background: var(--blue) !important; border: 1px solid var(--blue) !important; color: #fff !important; box-shadow: none !important; border-radius: 10px !important;
                font-weight: 700 !important; padding: 13px 24px !important; margin-top: 10px; width: auto; transition: background .15s ease, transform .1s ease; }}
.quiz .check:hover {{ background: var(--blue-deep) !important; }}
.quiz .check:active {{ transform: scale(.98); }}
.result {{ margin-top: 14px; animation: rise .25s ease both; }}
.result .scorecard {{ display: flex; align-items: center; gap: 18px; padding: 16px 20px; border-radius: 12px; background: var(--wash); margin-bottom: 14px; }}
.result .scorecard svg {{ width: 64px; height: 64px; flex: none; }}
.result .scorecard .s1 {{ font-size: 18px; font-weight: 700; color: var(--blue); margin: 0 0 2px; }}
.result .scorecard .s2 {{ font-size: 14px; color: var(--muted); margin: 0; }}
.result .item {{ padding: 14px 16px; border-radius: 10px; margin-bottom: 10px; font-size: 15px; line-height: 1.5; }}
.result .item.ok {{ background: #E7F6F4; border-left: 4px solid var(--teal); }}
.result .item.miss {{ background: #FBEFEA; border-left: 4px solid var(--miss); }}
.result .item p {{ margin: 0 0 6px; }}
.result .item p:last-child {{ margin: 0; }}
.result .item b {{ color: var(--blue); }}
.result .warn {{ color: var(--miss); font-weight: 700; }}
/* Tools by team */
.teamwrap .tabs {{ margin-top: 14px; background: var(--paper) !important; border: 1px solid var(--rule) !important; border-radius: 16px !important; box-shadow: var(--shadow); padding: 10px 44px 34px !important; }}
.teamwrap .tabs button {{ font-size: 15px !important; font-weight: 700 !important; color: var(--muted) !important; border: none !important; border-bottom: 3px solid transparent !important;
                           border-radius: 0 !important; padding: 14px 18px !important; background: transparent !important; box-shadow: none !important; }}
.teamwrap .tabs button.selected {{ color: var(--blue) !important; border-bottom-color: var(--teal) !important; }}
.teamwrap .tabitem {{ border: none !important; padding: 4px 0 0 !important; background: transparent !important; }}
.teamwrap .tabitem h3 {{ font-size: 19px; color: var(--blue); margin: 26px 0 8px; }}
.teamwrap .tabitem h3:first-child {{ margin-top: 12px; }}
.teamwrap .tabitem p {{ font-size: 16.5px; line-height: 1.65; margin: 0 0 12px; max-width: 72ch; color: var(--ink); }}
.teamwrap .tabitem p b {{ color: var(--blue); }}
/* Nav */
.navrow {{ margin-top: 14px; align-items: center; }}
.navrow button {{ border-radius: 10px !important; font-weight: 700 !important; font-size: 14px !important; padding: 13px 22px !important; transition: background .15s ease, transform .1s ease; }}
.navrow button:active {{ transform: scale(.98); }}
.navrow .primary {{ background: var(--teal) !important; border: 1px solid var(--teal) !important; color: #fff !important; box-shadow: none !important; }}
.navrow .primary:hover {{ background: var(--teal-deep) !important; }}
.navrow .secondary {{ background: var(--paper) !important; border: 1px solid var(--rule) !important; color: var(--blue) !important; box-shadow: none !important; }}
.navrow .secondary:hover {{ background: var(--wash) !important; }}
.progress {{ text-align: center; color: var(--muted); font-size: 14px; }}
@media (max-width: 1000px) {{ .mgrid {{ grid-template-columns: repeat(2, 1fr); }} .hero {{ grid-template-columns: 1fr; padding: 32px; }} .hero .ring {{ display: none; }} }}
@media (max-width: 720px) {{
  .rail {{ position: static; }} .mgrid {{ grid-template-columns: 1fr; }}
  .reader {{ padding: 28px 22px; }} .quiz {{ padding: 22px 20px !important; }} .teamwrap .tabs {{ padding: 8px 18px 24px !important; }}
  .reader h2 {{ font-size: 28px; }} .hero h2 {{ font-size: 30px; }} .topbar .divider {{ display: none; }}
}}
"""

FORCE_LIGHT = """
() => {
  const strip = () => {
    document.body.classList.remove('dark');
    document.documentElement.classList.remove('dark');
    document.querySelectorAll('.dark').forEach(el => el.classList.remove('dark'));
  };
  strip();
  new MutationObserver(strip).observe(document.body, { attributes: true, attributeFilter: ['class'] });
}
"""

THEME = gr.themes.Default(primary_hue="teal", neutral_hue="slate").set(
    body_background_fill=WASH, body_background_fill_dark=WASH,
    block_background_fill=PAPER, block_background_fill_dark=PAPER,
    block_label_text_color=INK, block_label_text_color_dark=INK,
    body_text_color=INK, body_text_color_dark=INK,
    border_color_primary=RULE, border_color_primary_dark=RULE,
    checkbox_label_background_fill=PAPER, checkbox_label_background_fill_dark=PAPER,
    checkbox_label_background_fill_selected="#E7F6F4", checkbox_label_background_fill_selected_dark="#E7F6F4",
    checkbox_label_text_color=INK, checkbox_label_text_color_dark=INK,
    checkbox_label_text_color_selected=BLUE, checkbox_label_text_color_selected_dark=BLUE,
    checkbox_background_color=PAPER, checkbox_background_color_dark=PAPER,
    checkbox_background_color_selected=TEAL, checkbox_background_color_selected_dark=TEAL,
    checkbox_border_color=MUTED, checkbox_border_color_dark=MUTED,
)


# Rendering helpers

def ring(pct: int, size=160, stroke=12, track="rgba(255,255,255,.18)", color=TEAL, text_color="#fff", sub=""):
    r = (size - stroke) / 2
    c = 2 * 3.14159 * r
    dash = c * pct / 100
    sub_el = f'<text x="50%" y="66%" text-anchor="middle" font-size="{size*0.085}" fill="{text_color}" opacity=".75" font-family="Arial">{html.escape(sub)}</text>' if sub else ""
    return (
        f'<svg viewBox="0 0 {size} {size}" role="img" aria-label="{pct} percent complete">'
        f'<circle cx="{size/2}" cy="{size/2}" r="{r}" fill="none" stroke="{track}" stroke-width="{stroke}"/>'
        f'<circle cx="{size/2}" cy="{size/2}" r="{r}" fill="none" stroke="{color}" stroke-width="{stroke}" stroke-linecap="round" '
        f'stroke-dasharray="{dash:.1f} {c:.1f}" transform="rotate(-90 {size/2} {size/2})" style="transition:stroke-dasharray .6s ease"/>'
        f'<text x="50%" y="{"52%" if sub else "50%"}" dominant-baseline="middle" text-anchor="middle" font-size="{size*0.21}" font-weight="700" fill="{text_color}" font-family="Arial">{pct}%</text>'
        f"{sub_el}</svg>"
    )


def pct_done(progress: dict) -> int:
    return round(100 * len(progress) / N)


def figure(svg_markup: str, caption: str) -> str:
    return f'<figure class="fig">{svg_markup}<figcaption>{html.escape(caption)}</figcaption></figure>'


def render_home(progress: dict) -> str:
    done = len(progress)
    pct = pct_done(progress)
    next_idx = next((i for i in range(N) if i not in progress), None)
    total_min = sum(MINUTES)
    parts = [f"""
<div class="card hero">
  <div>
    <p class="eyebrow">BOS Security company training</p>
    <h2>Using AI well, and safely, at BOS</h2>
    <p>Six short modules that build on each other: what AI is, how it works, how to get real results from Claude Enterprise, and where the hard lines on client and company data sit. Each module ends with a knowledge check.</p>
    <div class="stats">
      <div class="stat"><b>{N}</b><span>modules</span></div>
      <div class="stat"><b>{total_min} min</b><span>total reading</span></div>
      <div class="stat"><b>{TOTAL_Q}</b><span>check questions</span></div>
      <div class="stat"><b>{done} of {N}</b><span>completed</span></div>
    </div>
  </div>
  <div class="ring">{ring(pct, sub="complete")}<span class="label">Progress this session</span></div>
</div>"""]
    if next_idx is not None:
        m = MODULES[next_idx]
        label = "Start here" if done == 0 else "Continue where you left off"
        parts.append(f"""
<div class="card resume">
  <div><p class="t">{label}</p><p class="n">Module {next_idx + 1}. {html.escape(m['title'])}</p></div>
  <button type="button" onclick="document.getElementById('rail-{next_idx + 1}').click()">{'Begin module' if done == 0 else 'Resume'}</button>
</div>""")
    else:
        parts.append("""
<div class="card resume">
  <div><p class="t">All modules completed</p><p class="n">You have completed the BOS AI training path. Keep the Tools by team page handy.</p></div>
  <button type="button" onclick="document.getElementById('rail-team').click()">Open Tools by team</button>
</div>""")
    parts.append(f'<div class="grid-head"><h3>Learning path</h3><span>Read in order. Each module builds on the one before it.</span></div><div class="mgrid">')
    for i, m in enumerate(MODULES):
        is_done = i in progress
        req = m["depth"].lower() == "required"
        cls = "mcard" + (" done" if is_done else "") + (" required" if req else "")
        if is_done:
            status = f'<span class="status">Scored {progress[i][0]} of {progress[i][1]}</span>'
        elif req:
            status = '<span class="status req">Required</span>'
        else:
            status = f'<span class="status">{html.escape(m["depth"])}</span>'
        parts.append(f"""
<button type="button" class="{cls}" style="animation-delay:{i*40}ms" onclick="document.getElementById('rail-{i + 1}').click()">
  <div class="row"><span class="num">{'&#10003;' if is_done else i + 1}</span>{status}</div>
  <h4>{html.escape(m['title'])}</h4>
  <p>{html.escape(m['summary'])}</p>
  <div class="foot"><span>{MINUTES[i]} min read{(' + ' + str(sum(v['minutes'] for v in VIDEOS.get(i, []))) + ' min video') if VIDEOS.get(i) else ''}</span><b>{len(QUIZZES[i])} questions</b></div>
</button>""")
    parts.append(f"""
<button type="button" class="mcard ref" style="animation-delay:{N*40}ms" onclick="document.getElementById('rail-team').click()">
  <div class="row"><span class="num" style="background:var(--teal-deep)">&#9776;</span><span class="status">Reference</span></div>
  <h4>Tools by team</h4>
  <p>Where Claude fits next to Zoho, Apollo, and Microsoft 365 for Staffing, Security, Sales, and VirtuGuard.</p>
  <div class="foot"><span>4 teams</span><b>Open any time</b></div>
</button></div>""")
    return "\n".join(parts)


def render_module(idx: int, progress: dict) -> str:
    m = MODULES[idx]
    req = m["depth"].lower() == "required"
    pills = f'<span class="pill{" required" if req else ""}">{html.escape(m["depth"])}</span>'
    if idx in progress:
        pills += f'<span class="pill done">Scored {progress[idx][0]} of {progress[idx][1]}</span>'
    parts = [
        '<div class="card reader">',
        f'<div class="meta">{pills}<span>Module {idx + 1} of {N}</span><span>{MINUTES[idx]} min read</span></div>',
        f'<h2>{html.escape(m["title"])}</h2>',
        f'<p class="summary">{html.escape(m["summary"])}</p>',
    ]
    for v in VIDEOS.get(idx, []):
        parts.append(watch_panel(v))
    for s in m["sections"]:
        parts.append(f'<h3>{html.escape(s["heading"])}</h3>')
        parts.append(s["body"])
        fig = FIGURES.get((idx, s["heading"]))
        if fig:
            parts.append(figure(*fig))
    parts.append('<div class="takeaways"><h3>Key takeaways</h3><ol>' + "".join(f"<li>{html.escape(t)}</li>" for t in m["takeaways"]) + "</ol></div>")
    parts.append(link_cards(LINKS.get(idx, [])))
    parts.append(f'<div class="help"><p><b>Need help?</b> {html.escape(IT_HELP)}</p></div>')
    parts.append("</div>")
    return "\n".join(parts)


def watch_panel(v: dict) -> str:
    src = f"https://www.youtube-nocookie.com/embed/{v['id']}?rel=0&modestbranding=1"
    return (
        '<div class="watch">'
        f'<div class="wh"><h3>Watch</h3><span>Anthropic, {v["minutes"]} min</span></div>'
        f'<div class="frame"><iframe src="{src}" title="{html.escape(v["title"])}" loading="lazy" '
        'allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" '
        'referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe></div>'
        f'<p class="wt">{html.escape(v["title"])}</p><p class="wb">{html.escape(v["blurb"])}</p>'
        f'<p class="ws">Published by Anthropic. <a href="{v["source"]}" target="_blank" rel="noopener">Open the original tutorial page</a></p>'
        "</div>"
    )


def link_cards(links: list, heading: str = "Go further with Anthropic's free courses") -> str:
    if not links:
        return ""
    cards = "".join(
        f'<a class="lcard" href="{l["url"]}" target="_blank" rel="noopener"><p class="lt">{html.escape(l["title"])}</p>'
        f'<p class="lm">{html.escape(l["meta"])}</p><p class="lb">{html.escape(l["blurb"])}</p></a>'
        for l in links
    )
    return f'<div class="more"><h3>{html.escape(heading)}</h3><div class="lgrid">{cards}</div></div>'


def render_team_header() -> str:
    return (
        '<div class="card reader" style="padding-bottom:22px">'
        '<div class="meta"><span class="pill">Reference</span><span>Tools by team</span></div>'
        "<h2>Where Claude fits next to Zoho, Apollo, and Microsoft 365</h2>"
        f"{TEAMS_INTRO}{figure(*TEAM_FIGURE)}{link_cards(TEAM_LINKS, 'Role based tutorials from Anthropic')}</div>"
    )


def track(idx: int, progress: dict) -> str:
    return f'<div class="track"><div style="width:{pct_done(progress)}%"></div></div>'


def pct_badge(progress: dict) -> str:
    return f'<div class="pct">{pct_done(progress)}% complete</div>'


def progress_text(page: int) -> str:
    if page == HOME:
        return '<div class="progress">Overview</div>'
    if page == TEAM_PAGE:
        return '<div class="progress">Reference</div>'
    return f'<div class="progress">Module {page} of {N}</div>'


def rail_labels(progress: dict):
    labels = ["Overview"]
    for i, m in enumerate(MODULES):
        mark = "\u2713  " if i in progress else ""
        labels.append(f"{mark}{i + 1}.  {m['title']}")
    labels.append("Tools by team")
    return labels


def rail_updates(page: int, progress: dict):
    labels = rail_labels(progress)
    out = []
    for i, lab in enumerate(labels):
        if i == page:
            variant = "primary"
        elif 1 <= i <= N and (i - 1) in progress:
            variant = "stop"
        else:
            variant = "secondary"
        out.append(gr.update(value=lab, variant=variant))
    return out


def quiz_updates(page: int):
    qs = QUIZZES[page - 1] if 1 <= page <= N else []
    out = []
    for i in range(MAXQ):
        if i < len(qs):
            out.append(gr.update(label=f"{i + 1}. {qs[i]['q']}", choices=qs[i]["options"], value=None, visible=True))
        else:
            out.append(gr.update(visible=False, value=None))
    return out


def quiz_head(page: int) -> str:
    n = len(QUIZZES[page - 1]) if 1 <= page <= N else 0
    return (f'<div class="qhead"><h3>Knowledge check</h3><span>{n} questions</span></div>'
            '<p class="qsub">Pick one answer per question, then check. Anything you miss shows the correct answer and why. '
            'Checking your answers marks the module complete for this session; you can retake it any time.</p>')


def show(page: int, progress: dict):
    page = max(HOME, min(TEAM_PAGE, page))
    on_home, on_team = page == HOME, page == TEAM_PAGE
    on_module = not on_home and not on_team
    next_label = "Start module 1" if on_home else ("Tools by team" if page == N else "Next module")
    return [
        page,
        gr.update(visible=on_home),
        gr.update(visible=on_module),
        gr.update(visible=on_team),
        render_home(progress) if on_home else "",
        render_module(page - 1, progress) if on_module else "",
        track(page, progress),
        pct_badge(progress),
        progress_text(page),
        gr.update(interactive=page > HOME, value="Overview" if page == 1 else "Previous module"),
        gr.update(interactive=page < TEAM_PAGE, value=next_label),
        quiz_head(page),
        "",
        *rail_updates(page, progress),
        *quiz_updates(page),
    ]


def grade(page: int, progress: dict, *answers):
    idx = page - 1
    qs = QUIZZES[idx]
    unanswered = [i + 1 for i, a in enumerate(answers[: len(qs)]) if a is None]
    if unanswered:
        nums = ", ".join(str(n) for n in unanswered)
        word = "question" if len(unanswered) == 1 else "questions"
        return [progress, f'<div class="result"><p class="warn">Answer {word} {nums} before checking.</p></div>',
                gr.update(), gr.update(), gr.update(), *[gr.update() for _ in range(N + 2)]]
    items, correct = [], 0
    for i, q in enumerate(qs):
        chosen, right = answers[i], q["options"][q["answer"]]
        if chosen == right:
            correct += 1
            items.append(f'<div class="item ok"><p><b>Question {i + 1}.</b> Correct.</p><p>{html.escape(right)}</p></div>')
        else:
            items.append(f'<div class="item miss"><p><b>Question {i + 1}.</b> Not quite. You chose: {html.escape(chosen)}</p>'
                         f'<p><b>Correct answer:</b> {html.escape(right)}</p><p>{html.escape(q["why"])}</p></div>')
    pct = round(100 * correct / len(qs))
    progress = dict(progress)
    progress[idx] = (correct, len(qs))
    if correct == len(qs):
        s1, s2 = f"All {len(qs)} correct.", "Module marked complete. Move on when you are ready."
    else:
        s1, s2 = f"{correct} of {len(qs)} right.", "Read the explanations below, then move on. You can retake the check any time."
    card = (f'<div class="scorecard">{ring(pct, size=64, stroke=7, track="#E1E8ED", color=TEAL if pct == 100 else BLUE, text_color=BLUE)}'
            f'<div><p class="s1">{s1}</p><p class="s2">{s2}</p></div></div>')
    result = f'<div class="result">{card}{"".join(items)}</div>'
    return [progress, result, track(page, progress), pct_badge(progress),
            render_module(idx, progress), *rail_updates(page, progress)]


with gr.Blocks(css=CSS, js=FORCE_LIGHT, theme=THEME, title="BOS AI Training") as demo:
    logo_html = f'<img src="{LOGO_SRC}" alt="BOS">' if LOGO_SRC else ""
    with gr.Row(elem_classes=["topbar-row"]):
        topbar = gr.HTML(f"""
<div class="topbar">
  <div class="brand">{logo_html}<div class="divider"></div>
    <div><h1>AI Training Platform</h1><p class="tag">Six modules with knowledge checks, plus a tools by team reference.</p></div>
  </div>
  <div class="right"><div class="tool">Company standard: <b>Claude Enterprise</b></div></div>
</div>""")
    bar = gr.HTML(track(HOME, {}))
    page_state = gr.State(HOME)
    progress_state = gr.State({})

    with gr.Row(equal_height=False):
        with gr.Column(scale=3, min_width=250, elem_classes=["rail"]):
            gr.HTML('<div class="rail-head">Learning path</div>')
            rail_btns = [gr.Button("Overview", variant="primary", elem_id="rail-0")]
            for i, m in enumerate(MODULES):
                rail_btns.append(gr.Button(f"{i + 1}.  {m['title']}", variant="secondary", elem_id=f"rail-{i + 1}"))
            gr.HTML('<div class="rail-sub">Reference</div>')
            rail_btns.append(gr.Button("Tools by team", variant="secondary", elem_id="rail-team"))
            pct_html = gr.HTML(pct_badge({}))

        with gr.Column(scale=8):
            with gr.Column(visible=True) as home_view:
                home = gr.HTML(render_home({}))

            with gr.Column(visible=False) as module_view:
                content = gr.HTML("")
                with gr.Column(elem_classes=["quiz"]):
                    qhead = gr.HTML(quiz_head(1))
                    radios = [gr.Radio(choices=[], label="", visible=False) for _ in range(MAXQ)]
                    check_btn = gr.Button("Check answers", elem_classes=["check"])
                    result = gr.HTML("")

            with gr.Column(visible=False, elem_classes=["teamwrap"]) as team_view:
                gr.HTML(render_team_header())
                with gr.Tabs():
                    for t in TEAMS:
                        with gr.Tab(t["name"]):
                            gr.HTML(t["html"])

            with gr.Row(elem_classes=["navrow"]):
                prev_btn = gr.Button("Previous module", variant="secondary", interactive=False)
                progress_lbl = gr.HTML(progress_text(HOME))
                next_btn = gr.Button("Start module 1", variant="primary")

    outputs = [page_state, home_view, module_view, team_view, home, content, bar, pct_html, progress_lbl,
               prev_btn, next_btn, qhead, result, *rail_btns, *radios]
    for i, b in enumerate(rail_btns):
        b.click(lambda prog, i=i: show(i, prog), inputs=progress_state, outputs=outputs)
    prev_btn.click(lambda p, prog: show(p - 1, prog), inputs=[page_state, progress_state], outputs=outputs)
    next_btn.click(lambda p, prog: show(p + 1, prog), inputs=[page_state, progress_state], outputs=outputs)
    check_btn.click(grade, inputs=[page_state, progress_state, *radios],
                    outputs=[progress_state, result, bar, pct_html, content, *rail_btns])
    demo.load(lambda: show(HOME, {}), outputs=outputs)

if __name__ == "__main__":
    demo.launch()