/* SESMO Pre-Security Course — DARK (black & blue) theme, matching the internal LMS (src/index.css). */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg:#030712; --bg-alt:#0a0a0f; --surface:#0d1117; --surface-2:#12141a; --surface-3:#171a21;
  --primary:#00b4ff; --secondary:#38bdf8; --primary-dim:#0e7fb8;
  --text:#e4e4e7; --text-2:#b3b7c0; --muted:#71717a;
  --border:#1e293b; --border-2:#26324a;
  --ok:#22c55e; --ok-bg:rgba(34,197,94,.14); --bad:#ff4757; --bad-bg:rgba(255,71,87,.13); --warn:#fbbf24;
  --radius:12px;
  --glow:0 0 0 1px rgba(0,180,255,.15), 0 8px 30px rgba(0,180,255,.08);
  --mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
html { scroll-behavior:smooth; }
body { font-family:'Inter',system-ui,sans-serif; background:var(--bg); color:var(--text); line-height:1.7; -webkit-font-smoothing:antialiased; }
.container { max-width:1100px; margin:0 auto; padding:0 24px; }
.reader { max-width:800px; }
a { color:var(--secondary); }
em { color:var(--text); }

/* Nav */
nav { position:sticky; top:0; z-index:100; background:rgba(3,7,18,.82); backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px); border-bottom:1px solid var(--border); }
.nav-inner { display:flex; align-items:center; justify-content:space-between; height:64px; }
.nav-logo { font-size:1.3rem; font-weight:800; letter-spacing:-.02em; text-decoration:none; color:#fff; }
.nav-logo span { color:var(--primary); }
.nav-links { display:flex; gap:26px; list-style:none; align-items:center; }
.nav-links a { font-size:.9rem; font-weight:500; color:var(--text-2); text-decoration:none; transition:color .2s; }
.nav-links a:hover { color:var(--primary); }
.btn-nav { font-size:.85rem; font-weight:600; background:var(--primary); color:#03121c; padding:9px 22px; border-radius:8px; text-decoration:none; transition:box-shadow .2s,transform .15s; }
.btn-nav:hover { box-shadow:0 0 18px rgba(0,180,255,.5); transform:translateY(-1px); }
.nav-links a.btn-nav, .nav-links a.btn-nav:hover { color:#03121c; }  /* beat .nav-links a specificity so button text stays dark/legible */
@media (max-width:640px){ .nav-links { gap:14px; } .nav-links a.hide-sm { display:none; } }

/* Hero */
.hero { position:relative; overflow:hidden; padding:76px 0 60px; background:radial-gradient(1200px 400px at 20% -10%, rgba(0,180,255,.12), transparent 60%), linear-gradient(180deg,#05070f 0%,#030712 100%); border-bottom:1px solid var(--border); }
.hero::before { content:''; position:absolute; inset:0; background-image:linear-gradient(rgba(30,41,59,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(30,41,59,.5) 1px,transparent 1px); background-size:46px 46px; mask-image:radial-gradient(700px 300px at 30% 0%, #000 40%, transparent 80%); opacity:.6; pointer-events:none; }
.hero .container { position:relative; }
.tag { display:inline-block; font-size:.72rem; font-weight:600; letter-spacing:.08em; text-transform:uppercase; color:var(--primary); background:rgba(0,180,255,.1); border:1px solid rgba(0,180,255,.28); border-radius:99px; padding:4px 14px; margin-bottom:16px; }
.hero h1 { font-size:clamp(1.9rem,4vw,2.8rem); font-weight:800; letter-spacing:-.02em; line-height:1.12; color:#fff; max-width:16ch; }
.hero p.lead { margin-top:16px; font-size:1.08rem; color:var(--text-2); max-width:60ch; }
.hero .meta { margin-top:22px; display:flex; gap:22px; flex-wrap:wrap; font-size:.86rem; color:var(--muted); }
.hero .meta b { color:var(--secondary); }

/* Module cards */
.modules { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:20px; padding:48px 0; }
.mod-card { display:flex; flex-direction:column; background:linear-gradient(180deg,var(--surface-2),var(--surface)); border:1px solid var(--border); border-radius:var(--radius); padding:24px; text-decoration:none; color:inherit; transition:transform .2s,box-shadow .2s,border-color .2s; }
.mod-card:hover { transform:translateY(-3px); box-shadow:var(--glow); border-color:var(--primary-dim); }
.mod-num { font-size:.75rem; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--primary); }
.mod-card h3 { margin:8px 0; font-size:1.18rem; color:#fff; line-height:1.3; }
.mod-card p { font-size:.92rem; color:var(--text-2); }
.mod-card .sub { margin-top:14px; font-size:.82rem; color:var(--muted); }
.mod-card .go { margin-top:16px; font-size:.85rem; font-weight:600; color:var(--secondary); }
.mod-card .done-badge { display:none; align-self:flex-start; margin-top:12px; font-size:.72rem; font-weight:700; color:var(--ok); background:var(--ok-bg); padding:3px 10px; border-radius:99px; }
.mod-card.done { border-color:rgba(34,197,94,.4); }
.mod-card.done .done-badge { display:inline-block; }

/* Article / prose */
.reader { padding:40px 0 80px; }
.crumbs { font-size:.82rem; color:var(--muted); margin-bottom:8px; }
.crumbs a { color:var(--text-2); text-decoration:none; }
.reader > h1 { font-size:clamp(1.7rem,3.4vw,2.3rem); font-weight:800; color:#fff; letter-spacing:-.02em; line-height:1.18; margin-bottom:8px; }
.reader > .intro { font-size:1.06rem; color:var(--text-2); margin-bottom:8px; }
.section { padding:36px 0; border-top:1px solid var(--border); }
.section:first-of-type { border-top:none; }
.section h2 { font-size:1.45rem; font-weight:700; color:#fff; margin-bottom:14px; letter-spacing:-.01em; }
.section h2 .sec-no { color:var(--primary); }
.section h3 { font-size:1.08rem; font-weight:700; color:var(--secondary); margin:24px 0 8px; }
.section p { margin:13px 0; color:var(--text); }
.section ul, .section ol { margin:12px 0 12px 22px; }
.section li { margin:7px 0; color:var(--text); }
.section li::marker { color:var(--primary); }
.section strong { font-weight:700; color:#fff; }
.section code { font-family:var(--mono); font-size:.85em; background:var(--surface-3); border:1px solid var(--border-2); border-radius:5px; padding:1px 6px; color:#7fd0ff; }
pre { background:#05080f; color:#d7dbe3; border:1px solid var(--border); border-radius:10px; padding:16px 18px; overflow-x:auto; margin:16px 0; font-size:.85rem; line-height:1.6; font-family:var(--mono); }
pre code { background:none; border:none; color:inherit; padding:0; }
pre .c-kw { color:#00b4ff; } pre .c-str { color:#7ee787; } pre .c-cmt { color:#6b7280; } pre .c-warn { color:#ff7b8a; }

/* Callouts */
.inshort { margin:20px 0; padding:14px 18px; background:rgba(0,180,255,.06); border-left:3px solid var(--primary); border-radius:0 8px 8px 0; }
.inshort p { margin:0; color:var(--text-2); }
.inshort b { color:var(--primary); }
.tryit { margin:20px 0; padding:16px 18px 18px; background:var(--surface); border:1px solid var(--border-2); border-radius:10px; }
.tryit .tryit-h { font-size:.74rem; letter-spacing:.09em; text-transform:uppercase; color:var(--warn); font-weight:700; margin-bottom:8px; display:flex; align-items:center; gap:7px; }
.tryit p { margin:8px 0; }
.tryit ol { margin:8px 0 4px 20px; }
.note { margin:18px 0; padding:12px 16px; background:rgba(251,191,36,.07); border:1px solid rgba(251,191,36,.3); border-radius:8px; font-size:.93rem; color:var(--text-2); }
.note b { color:var(--warn); }
.callout { margin:22px 0; padding:16px 18px; background:linear-gradient(180deg,rgba(0,180,255,.09),rgba(0,180,255,.03)); border:1px solid rgba(0,180,255,.3); border-radius:10px; font-size:.95rem; color:var(--text-2); }
.callout b { color:#fff; }
.muted-note { margin:16px 0; padding-left:14px; border-left:2px solid var(--border-2); font-size:.9rem; font-style:italic; color:var(--muted); }

/* Diagram figure */
figure.diagram { margin:22px 0; padding:18px; background:var(--surface); border:1px solid var(--border); border-radius:12px; text-align:center; overflow-x:auto; }
figure.diagram svg { max-width:100%; height:auto; }
figure.diagram figcaption { margin-top:12px; font-size:.82rem; color:var(--muted); }

/* Tables */
.tbl-wrap { overflow-x:auto; margin:16px 0; border:1px solid var(--border); border-radius:10px; }
table { border-collapse:collapse; width:100%; font-size:.9rem; min-width:440px; }
th, td { text-align:left; padding:11px 15px; border-bottom:1px solid var(--border); vertical-align:top; color:var(--text); }
th { background:var(--surface-2); font-weight:700; color:var(--secondary); }
tr:last-child td { border-bottom:none; }
tbody tr:hover { background:rgba(255,255,255,.02); }

/* Glossary */
.glossary { margin:14px 0; padding:6px 20px; background:var(--surface); border:1px solid var(--border); border-radius:12px; }
.glossary dt { font-weight:700; color:var(--primary); margin-top:14px; font-size:.95rem; }
.glossary dd { margin:3px 0 0; color:var(--text-2); font-size:.93rem; }
.glossary dt:first-child { margin-top:6px; }
.glossary + p, .glossary { margin-bottom:14px; }

/* Recap */
.recap { margin:22px 0; padding:18px 22px; background:linear-gradient(180deg,var(--surface-2),var(--surface)); border:1px solid var(--border-2); border-radius:12px; }
.recap h3 { color:#fff; margin:0 0 8px; font-size:1.05rem; }
.recap ul { margin:8px 0 0 20px; }
.recap li { color:var(--text-2); }

/* Quiz */
.quiz { margin:26px 0 6px; padding:22px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); }
.quiz.module-quiz { border-color:var(--primary-dim); box-shadow:var(--glow); }
.quiz h4 { font-size:.76rem; letter-spacing:.08em; text-transform:uppercase; color:var(--primary); font-weight:700; margin-bottom:14px; }
.quiz .q { list-style:none; margin:0 0 18px; padding:0; }
.quiz .q-text { font-weight:600; margin-bottom:8px; color:var(--text); }
.quiz .opt { display:block; margin:6px 0; padding:9px 13px; border:1px solid var(--border-2); border-radius:8px; cursor:pointer; background:var(--bg-alt); transition:border-color .15s,background .15s; font-size:.92rem; color:var(--text); }
.quiz .opt:hover { border-color:var(--primary); }
.quiz .opt input { margin-right:9px; accent-color:var(--primary); }
.quiz .opt.correct { border-color:var(--ok); background:var(--ok-bg); }
.quiz .opt.wrong { border-color:var(--bad); background:var(--bad-bg); }
.quiz .q-explain { display:none; margin-top:8px; font-size:.88rem; color:var(--text-2); padding:9px 13px; background:var(--bg-alt); border-radius:8px; border:1px dashed var(--border-2); }
.quiz .q.checked .q-explain { display:block; }
.quiz-check { margin-top:6px; font-size:.86rem; font-weight:600; background:var(--primary); color:#03121c; border:none; padding:10px 22px; border-radius:8px; cursor:pointer; transition:box-shadow .2s; }
.quiz-check:hover { box-shadow:0 0 16px rgba(0,180,255,.45); }
.quiz-result { margin-top:12px; font-weight:600; font-size:.95rem; display:none; }
.quiz-result.show { display:block; }
.quiz-result.pass { color:var(--ok); }
.quiz-result.fail { color:var(--bad); }

/* Pager */
.pager { display:flex; justify-content:space-between; gap:14px; margin-top:44px; padding-top:26px; border-top:1px solid var(--border); }
.pager a { flex:1; text-decoration:none; padding:16px 18px; border:1px solid var(--border); border-radius:var(--radius); color:var(--text-2); background:var(--surface); transition:border-color .2s,box-shadow .2s; }
.pager a:hover { border-color:var(--primary-dim); box-shadow:var(--glow); }
.pager a.next { text-align:right; }
.pager .dir { font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); }
.pager .ttl { display:block; margin-top:3px; font-weight:600; color:#fff; font-size:.95rem; }
.pager a.disabled { opacity:.35; pointer-events:none; }

/* Progress */
.progress-wrap { margin:8px 0 0; }
.progress-track { height:8px; background:var(--surface-3); border-radius:99px; overflow:hidden; border:1px solid var(--border); }
.progress-fill { height:100%; width:0; background:linear-gradient(90deg,var(--primary-dim),var(--primary)); box-shadow:0 0 12px rgba(0,180,255,.5); transition:width .4s; }
.progress-label { font-size:.82rem; color:var(--text-2); margin-top:8px; }

/* Footer */
footer { background:var(--bg-alt); color:#fff; padding:40px 0; margin-top:20px; border-top:1px solid var(--border); }
footer .nav-logo { color:#fff; }
footer p { color:var(--muted); font-size:.88rem; margin-top:8px; max-width:52ch; }
footer a { color:var(--secondary); }