/* Shared styles for thavionai.com/education/<module>.html — generated pages, see scripts/build_education.py */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #06060c;
  --bg2: #0a0a14;
  --bg3: #0f0f1b;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(255,255,255,0.14);
  --text: #eceef6;
  --text2: #a4a9be;
  --text3: #6c718a;
  --blue: #3b82f6;
  --blue2: #60a5fa;
  --green: #34d399;
  --grad: linear-gradient(92deg, #8b5cf6 0%, #d946ef 100%);
  --red: #f87171;
  --amber: #fbbf24;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.track-devops { --accent: #60a5fa; --accent-bg: rgba(59,130,246,0.10); --accent-border: rgba(59,130,246,0.3); }
.track-sre    { --accent: #34d399; --accent-bg: rgba(16,185,129,0.10); --accent-border: rgba(16,185,129,0.3); }
.track-ai     { --accent: #a78bfa; --accent-bg: rgba(139,92,246,0.10); --accent-border: rgba(139,92,246,0.3); }
.track-security { --accent: #fb7185; --accent-bg: rgba(251,113,133,0.10); --accent-border: rgba(251,113,133,0.3); }
.track-data   { --accent: #fbbf24; --accent-bg: rgba(251,191,36,0.10); --accent-border: rgba(251,191,36,0.3); }
.track-certs  { --accent: #22d3ee; --accent-bg: rgba(34,211,238,0.10); --accent-border: rgba(34,211,238,0.3); }

html { scroll-behavior: smooth; scroll-padding-top: 130px; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.6; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }
[hidden] { display: none !important; }

/* NAV (matches the main site) */
body > nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 5%; height: 64px;
  background: rgba(6,6,12,0.75); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; letter-spacing: -0.3px; }
.nav-logo-icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; color: white;
}
img.nav-logo-icon { background: none; display: block; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 14px; color: var(--text2); font-weight: 500; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.nav-cta {
  padding: 8px 16px; border-radius: 10px; font-size: 13px; font-weight: 600;
  background: var(--grad); color: white; box-shadow: 0 6px 22px rgba(168,85,247,0.3); transition: transform 0.15s, box-shadow 0.15s;
}
.nav-links a.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(168,85,247,0.45); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text2); border-radius: 2px; }

/* HERO */
.lesson-hero {
  padding: 112px 0 40px;
  background: radial-gradient(ellipse 80% 70% at 50% 0%, var(--accent-bg) 0%, transparent 70%);
}
.crumbs { font-size: 12.5px; color: var(--text3); font-weight: 500; margin-bottom: 18px; }
.crumbs a { color: var(--text2); }
.crumbs a:hover { color: var(--accent); }
.lesson-hero h1 { font-size: clamp(30px, 5vw, 44px); font-weight: 800; letter-spacing: -1px; line-height: 1.12; margin-bottom: 14px; }
.lede { font-size: 17px; color: var(--text2); line-height: 1.65; max-width: 680px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.chip {
  font-size: 11.5px; font-weight: 600; padding: 4px 11px; border-radius: 20px;
  background: var(--accent-bg); border: 1px solid var(--accent-border); color: var(--accent);
}
.chip-quiz { background: rgba(16,185,129,0.12); border-color: rgba(16,185,129,0.35); color: #6ee7b7; }

/* SUBNAV */
.subnav {
  position: sticky; top: 64px; z-index: 50;
  background: rgba(6,6,12,0.9); backdrop-filter: blur(16px);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.subnav .wrap { display: flex; gap: 4px; overflow-x: auto; }
.subnav a {
  padding: 13px 14px; font-size: 13.5px; font-weight: 600; color: var(--text3);
  border-bottom: 2px solid transparent; white-space: nowrap; transition: color 0.15s;
}
.subnav a:hover { color: var(--text); }
.subnav a.on { color: var(--accent); border-bottom-color: var(--accent); }

/* LESSON BODY */
main.wrap { padding-top: 44px; padding-bottom: 80px; }
.intro { font-size: 17px; color: var(--text); line-height: 1.75; margin-bottom: 28px; }
.box-label { font-size: 11px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.objectives {
  padding: 22px 24px; border-radius: 14px; margin-bottom: 8px;
  background: var(--accent-bg); border: 1px solid var(--accent-border);
}
.lesson .objectives ul { list-style: none; display: grid; gap: 8px; margin: 0; }
.lesson .objectives li { font-size: 14.5px; color: var(--text); padding-left: 24px; position: relative; }
.objectives li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

.lesson section { margin-top: 48px; }
.lesson h2, .panel h2 { font-size: 24px; font-weight: 800; letter-spacing: -0.4px; line-height: 1.25; margin-bottom: 16px; }
.lesson p { font-size: 15.5px; color: #cbd5e1; line-height: 1.8; margin-bottom: 16px; }
.lesson ul, .lesson ol { margin: 0 0 18px 22px; display: grid; gap: 8px; }
.lesson li { font-size: 15.5px; color: #cbd5e1; line-height: 1.7; padding-left: 4px; }
.lesson li::marker { color: var(--accent); font-weight: 700; }
.lesson strong, .panel strong { color: var(--text); font-weight: 650; }
code {
  font-family: var(--mono); font-size: 0.875em;
  padding: 2px 6px; border-radius: 5px;
  background: rgba(255,255,255,0.07); color: #e2e8f0;
  overflow-wrap: anywhere;
}

.code { margin: 0 0 22px; border-radius: 12px; border: 1px solid var(--border2); background: #0c0c14; overflow: hidden; }
.code-cap { padding: 10px 16px 0; font-size: 12.5px; color: var(--text2); }
.code-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 10px 8px 16px; border-bottom: 1px solid var(--border);
  font-family: var(--mono); font-size: 11px; color: var(--text3); text-transform: lowercase;
}
.copy {
  font: inherit; font-family: 'Inter', sans-serif; font-size: 11.5px; font-weight: 600;
  padding: 4px 10px; border-radius: 6px; cursor: pointer;
  background: rgba(255,255,255,0.05); color: var(--text2); border: 1px solid var(--border2);
}
.copy:hover { color: var(--text); background: rgba(255,255,255,0.1); }
.code pre { padding: 16px; overflow-x: auto; }
.code pre code { padding: 0; background: none; font-size: 13px; line-height: 1.7; color: #e2e8f0; white-space: pre; }

.callout { margin: 0 0 22px; padding: 16px 18px; border-radius: 12px; border: 1px solid var(--border2); border-left-width: 3px; background: rgba(255,255,255,0.03); }
.callout strong { display: block; font-size: 11px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 4px; }
.callout p { margin: 0; font-size: 14.5px; line-height: 1.7; }
.callout-tip { border-left-color: var(--green); } .callout-tip > strong { color: #6ee7b7; }
.callout-warning { border-left-color: var(--amber); } .callout-warning > strong { color: var(--amber); }
.callout-note { border-left-color: var(--blue2); } .callout-note > strong { color: var(--blue2); }

.table-wrap { overflow-x: auto; margin: 0 0 22px; border-radius: 12px; border: 1px solid var(--border2); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-size: 11.5px; letter-spacing: 0.8px; text-transform: uppercase; color: var(--text3); background: rgba(255,255,255,0.03); }
th, td { padding: 11px 14px; border-bottom: 1px solid var(--border); vertical-align: top; color: #cbd5e1; line-height: 1.6; }
tr:last-child td { border-bottom: none; }

/* DIAGRAMS (inline SVG generated by scripts/diagrams.py) */
.diagram { margin: 4px 0 26px; }
.diagram-scroll { overflow-x: auto; padding: 4px 0; }
.diagram svg { color: var(--text2); font-family: 'Inter', -apple-system, sans-serif; }
.diagram figcaption { font-size: 13px; color: var(--text2); line-height: 1.6; margin-top: 8px; padding-left: 12px; border-left: 2px solid var(--accent-border); }
.dg-node { fill: rgba(255,255,255,0.035); stroke: var(--border2); stroke-width: 1.2; }
.dg-node-line { fill: none; stroke: var(--border2); stroke-width: 1.2; }
.dg-accent { fill: var(--accent-bg); stroke: var(--accent-border); }
.dg-muted { fill: transparent; stroke: rgba(148,163,184,0.45); stroke-dasharray: 5 4; }
.dg-danger { fill: rgba(248,113,113,0.08); stroke: rgba(248,113,113,0.55); }
.dg-ok { fill: rgba(16,185,129,0.08); stroke: rgba(16,185,129,0.5); }
.dg-actor { fill: rgba(255,255,255,0.06); }
.dg-store { fill: rgba(255,255,255,0.035); }
.dg-group { fill: rgba(255,255,255,0.02); stroke: rgba(148,163,184,0.35); stroke-width: 1; stroke-dasharray: 4 4; }
.dg-group-label { fill: var(--text3); }
.dg-label-bg { fill: var(--bg); opacity: 0.92; }

/* PANELS */
.panel {
  margin-top: 56px; padding: 30px; border-radius: 18px;
  border: 1px solid var(--border2);
  background: linear-gradient(160deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
}
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.practice ol { margin-left: 22px; display: grid; gap: 10px; }
.practice li { font-size: 15px; color: #cbd5e1; line-height: 1.7; padding-left: 4px; }
.practice li::marker { color: var(--accent); font-weight: 700; }
.ghost {
  font: inherit; font-size: 12.5px; font-weight: 600; padding: 8px 14px; border-radius: 8px; cursor: pointer;
  background: rgba(255,255,255,0.05); color: var(--text2); border: 1px solid var(--border2);
}
.ghost:hover { color: var(--text); background: rgba(255,255,255,0.1); }

/* CHEAT SHEET */
.focus, .pitfalls { margin-top: 8px; padding: 20px 22px; border-radius: 12px; background: var(--accent-bg); border: 1px solid var(--accent-border); }
.pitfalls { margin-top: 20px; background: rgba(251,191,36,0.06); border-color: rgba(251,191,36,0.25); }
.cheats h3 { font-size: 13px; font-weight: 700; letter-spacing: 0.4px; margin-bottom: 12px; }
.pitfalls h3 { color: var(--amber); }
.focus ul, .pitfalls ul { margin-left: 18px; display: grid; gap: 7px; }
.focus li, .pitfalls li { font-size: 14.5px; color: #dbe3ee; line-height: 1.65; }
.cheat-grid { display: grid; gap: 18px; margin-top: 20px; }
.cheat-group { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: rgba(0,0,0,0.2); }
.cheat-group h3 { margin: 0; padding: 11px 14px; color: var(--accent); background: rgba(255,255,255,0.03); border-bottom: 1px solid var(--border); }
.cheat-group td { font-size: 13.5px; padding: 9px 14px; }
.cheat-group td:first-child { width: 46%; }
.cheat-group td code { background: none; padding: 0; color: #e2e8f0; font-size: 12.5px; white-space: pre-wrap; word-break: break-word; }

/* QUIZ */
.quiz-sub { font-size: 14px; color: var(--text2); margin-bottom: 24px; }
.q { padding: 22px 0; border-top: 1px solid var(--border); }
.q-num { font-size: 11px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--text3); margin-bottom: 6px; }
.q-text { font-size: 16px; font-weight: 650; line-height: 1.55; margin-bottom: 14px; }
.opts { display: grid; gap: 8px; }
.opt {
  display: flex; gap: 12px; align-items: flex-start; width: 100%; text-align: left;
  font: inherit; font-size: 14.5px; line-height: 1.55; color: #cbd5e1; cursor: pointer;
  padding: 12px 14px; border-radius: 10px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border2); transition: all 0.15s;
}
.opt > span:last-child { min-width: 0; overflow-wrap: anywhere; }
.lesson p, .lesson li, .panel li, td, .q-text, .explain { overflow-wrap: break-word; }
.opt:hover:not(:disabled) { background: rgba(255,255,255,0.07); color: var(--text); border-color: var(--accent-border); }
.opt:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.opt:disabled { cursor: default; }
.opt-key {
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 6px; margin-top: 1px;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; background: rgba(255,255,255,0.07); color: var(--text2);
}
.opt.right { border-color: rgba(16,185,129,0.6); background: rgba(16,185,129,0.1); color: var(--text); }
.opt.right .opt-key { background: var(--green); color: #04130d; }
.opt.wrong { border-color: rgba(248,113,113,0.6); background: rgba(248,113,113,0.08); color: var(--text); }
.opt.wrong .opt-key { background: var(--red); color: #1f0707; }
.explain { margin-top: 12px; padding: 12px 14px; border-radius: 10px; font-size: 14px; line-height: 1.65; color: #cbd5e1; background: rgba(255,255,255,0.04); }
.explain b { color: var(--text); }
.result {
  margin-top: 8px; padding: 22px; border-radius: 14px; text-align: center;
  border: 1px solid var(--border2); background: rgba(255,255,255,0.03);
}
.result.pass { border-color: rgba(16,185,129,0.5); background: rgba(16,185,129,0.08); }
.result-score { font-size: 34px; font-weight: 800; letter-spacing: -1px; }
.result p { font-size: 14.5px; color: var(--text2); margin: 6px 0 16px; }
.btn {
  font: inherit; font-size: 14px; font-weight: 600; padding: 11px 22px; border-radius: 10px; cursor: pointer; border: none;
  background: linear-gradient(135deg, #3b82f6, #6366f1); color: white;
}
.btn:hover { filter: brightness(1.1); }

/* DONE + PAGER */
.done-row { margin-top: 32px; }
.done {
  display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--border2); background: rgba(255,255,255,0.03); font-size: 15px; font-weight: 600;
}
.done input { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; }
.feedback-row { margin-top: 28px; text-align: center; font-size: 14px; color: var(--text3); }
.feedback-row a { color: var(--accent); text-decoration: none; font-weight: 600; }
.feedback-row a:hover { text-decoration: underline; }
.pager { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: stretch; margin-top: 20px; }
.pager-link {
  display: flex; flex-direction: column; gap: 2px; padding: 16px 18px; border-radius: 12px;
  border: 1px solid var(--border2); background: rgba(255,255,255,0.03); transition: all 0.15s;
}
a.pager-link:hover { border-color: var(--accent-border); background: var(--accent-bg); }
.pager-link span { font-size: 11.5px; color: var(--text3); font-weight: 600; }
.pager-link strong { font-size: 14px; font-weight: 650; line-height: 1.4; }
.pager-next { text-align: right; }
.pager-link.is-empty { visibility: hidden; }
.pager-up { align-self: center; font-size: 12.5px; color: var(--text3); font-weight: 600; padding: 0 8px; text-align: center; }
.pager-up:hover { color: var(--accent); }

/* FOOTER */
footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
footer p, .footer-legal a { font-size: 12.5px; color: var(--text3); }
.footer-legal { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-legal a:hover { color: var(--text2); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 0;
    position: fixed; top: 64px; left: 0; right: 0;
    background: rgba(10,10,15,0.98); border-bottom: 1px solid var(--border); padding: 16px 0;
  }
  .nav-links.open a { padding: 12px 5%; border-bottom: 1px solid var(--border); }
  .nav-links.open a.nav-cta { margin: 12px 5% 4px; text-align: center; }
  .lesson-hero { padding-top: 96px; }
  .panel { padding: 22px 18px; }
  .cheat-group tr { display: block; padding: 9px 14px; border-bottom: 1px solid var(--border); }
  .cheat-group tr:last-child { border-bottom: none; }
  .cheat-group td { display: block; width: auto !important; padding: 0; border: none; }
  .cheat-group td:first-child { margin-bottom: 3px; }
  .pager { grid-template-columns: 1fr 1fr; }
  .pager-up { grid-column: 1 / -1; order: 3; padding: 8px; }
  .pager-link.is-empty { display: none; }
  .footer-row { flex-direction: column; text-align: center; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* "Print cheat sheet" prints only the cheat sheet, in ink-friendly colours */
@media print {
  body.print-cheats > *:not(main), body.print-cheats main > *:not(#cheatsheet), body.print-cheats [data-print] { display: none !important; }
  body.print-cheats, body.print-cheats .panel, body.print-cheats .focus, body.print-cheats .pitfalls,
  body.print-cheats .cheat-group, body.print-cheats .cheat-group h3 { background: #fff !important; color: #000 !important; border-color: #bbb !important; }
  body.print-cheats main { padding: 0; }
  body.print-cheats .panel { margin: 0; padding: 0; border: none; }
  body.print-cheats * { color: #000 !important; }
  body.print-cheats .cheat-group { break-inside: avoid; }
}

.save-hint { margin-top: 10px; font-size: 12.5px; color: var(--text3); }
.save-hint a { color: var(--accent); }