/* Basic Computer Skills — navy, cream and orange scheme matching the AI Tools Playbook. */
:root{
  --navy:#16213A; --navy-2:#1F2C4A; --navy-line:#3A4766;
  --cream:#F6F3EC; --paper:#FDFBF7; --line:#E4DED2;
  --ink:#16213A; --body:#3F4A5E; --muted:#6A7386;
  --accent:#B4501E; --accent-soft:#F8E6DA; --accent-light:#F2A06B;
  --on-navy:#FDFBF7; --on-navy-muted:#C9D2E3;
  --code-bg:#16213A; --code-text:#F6F3EC;
  --shadow:0 6px 24px rgba(22,33,58,.08);
  --r-sm:8px; --r-md:14px; --r-lg:20px;
  --f-head:"Rubik", Arial, sans-serif;
  --f-body:"Nunito Sans", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --f-mono:"JetBrains Mono", "Courier New", monospace;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --cream:#0F1627; --paper:#172036; --line:#2C3856;
  --ink:#F2EEE6; --body:#C9D2E3; --muted:#9AA6BD;
  --accent:#F2A06B; --accent-soft:#2E2420;
  --navy:#0B1120; --navy-2:#141D33; --navy-line:#2C3856;
  --code-bg:#0B1120;
  --shadow:0 6px 24px rgba(0,0,0,.35);
  color-scheme:dark;
}}
:root[data-theme="dark"]{
  --cream:#0F1627; --paper:#172036; --line:#2C3856;
  --ink:#F2EEE6; --body:#C9D2E3; --muted:#9AA6BD;
  --accent:#F2A06B; --accent-soft:#2E2420;
  --navy:#0B1120; --navy-2:#141D33; --navy-line:#2C3856;
  --code-bg:#0B1120;
  --shadow:0 6px 24px rgba(0,0,0,.35);
  color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--cream);color:var(--body);font-family:var(--f-body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:var(--f-head);color:var(--ink);line-height:1.15;margin:0;text-wrap:balance}
p{margin:0}
a{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent-light);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:var(--paper);color:var(--ink);padding:8px 14px;border-radius:var(--r-sm);z-index:50}
.skip:focus{left:12px}
.wrap{max-width:1120px;margin:0 auto;padding-inline:16px}

/* Header */
.bar{position:sticky;top:0;z-index:20;background:var(--navy);border-bottom:1px solid var(--navy-line)}
.bar-in{max-width:1120px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{font-family:var(--f-head);font-weight:700;font-size:1.2rem;color:var(--on-navy);text-decoration:none}
.nav{display:flex;flex-wrap:wrap;gap:4px 18px}
.nav a{color:var(--on-navy-muted);text-decoration:none;font-weight:600;font-size:.95rem;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--on-navy)}
.nav a[aria-current="page"]{color:var(--on-navy);border-bottom-color:var(--accent-light)}
.toolnav{max-width:1120px;margin:0 auto;padding:0 16px 12px;display:flex;gap:8px;overflow-x:auto;scrollbar-width:thin}
.toolnav a{flex:none;font-size:.88rem;font-weight:600;color:var(--on-navy-muted);text-decoration:none;border:1px solid var(--navy-line);background:var(--navy-2);border-radius:999px;padding:5px 14px;white-space:nowrap}
.toolnav a span{color:var(--accent-light);margin-right:2px}
.toolnav a:hover{color:var(--on-navy)}
.toolnav a[aria-current="page"]{background:var(--accent-light);border-color:var(--accent-light);color:#16213A}
.toolnav a[aria-current="page"] span{color:#16213A}
.toolnav a.opt{border-style:dashed}

/* Hero */
.hero{background:var(--navy);color:var(--on-navy-muted);padding:56px 0 64px}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:40px;align-items:end}
.eyebrow{font-size:.85rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-light)}
.hero h1{color:var(--on-navy);font-size:clamp(2.4rem,6vw,4rem);font-weight:700;margin:10px 0 12px}
.hero .sub{color:var(--accent-light);font-weight:600}
.hero .lede{font-size:1.15rem;margin-top:14px;max-width:58ch}
.facts{display:flex;flex-direction:column;gap:14px}
.fact{border-top:1px solid var(--navy-line);padding-top:12px}
.fact h2{font-family:var(--f-body);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-light);margin-bottom:4px}
.fact p{color:var(--on-navy)}
.btn{display:inline-block;margin-top:22px;font-weight:700;text-decoration:none;border-radius:999px;padding:10px 20px;background:var(--accent-light);color:#16213A}
.btn:hover{filter:brightness(1.05)}

/* Sections */
.block{padding:56px 0}
.block.alt{background:var(--paper);border-block:1px solid var(--line)}
.kicker{font-size:.85rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.block h2{font-size:clamp(1.7rem,4vw,2.4rem);font-weight:600;margin:8px 0 28px}
.intro{max-width:66ch;margin:-12px 0 28px}

/* Feature cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:18px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:22px 24px;display:flex;flex-direction:column;gap:6px}
.block.alt .card{background:var(--cream)}
.card h3{font-size:1.2rem;font-weight:600}

/* Steps */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr));gap:22px 40px;counter-reset:step;align-items:start}
.steps li{counter-increment:step;display:flex;gap:16px;align-items:flex-start}
.step-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.steps li::before{content:counter(step);flex:none;width:44px;height:44px;border-radius:50%;background:var(--accent);color:var(--paper);display:grid;place-items:center;font-family:var(--f-head);font-weight:700}
.steps h3{font-size:1.15rem;font-weight:600;padding-top:8px}
/* Compact steps: single-line course contents */
.steps.compact{gap:16px 40px}
.steps.compact li::before{width:38px;height:38px;font-size:.95rem}
.steps.compact .step-body p{padding-top:6px;color:var(--ink);font-weight:600}

.panel{background:var(--navy);color:var(--on-navy-muted);border-radius:var(--r-lg);padding:28px;display:flex;flex-direction:column;gap:16px;align-self:start}
.panel .eyebrow{display:block}
.panel-list{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:10px}
.panel-list li::marker{color:var(--accent-light)}
.panel-list b{color:var(--on-navy)}
.panel-link{color:var(--accent-light);font-weight:700;text-decoration:none}
.panel-link:hover{text-decoration:underline}

/* Tips */
.tips-layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:28px;align-items:start}
.tips{display:flex;flex-direction:column;gap:14px}
.tip{background:var(--paper);border-left:5px solid var(--accent);border-radius:var(--r-sm);padding:16px 20px;display:flex;flex-direction:column;gap:2px}
.block.alt .tip{background:var(--cream)}
.tip h3{font-size:1.1rem;font-weight:600}
.tip-warn{background:var(--accent-soft)!important}

/* Good to know */
.note{background:var(--accent-soft);border:1px solid var(--line);border-radius:var(--r-md);padding:20px 24px;max-width:80ch}
.note h2{font-size:1.1rem;margin:0 0 6px}

/* Prev / next */
.pager{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.pager a{flex:1 1 240px;text-decoration:none;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:16px 20px;display:flex;flex-direction:column;gap:2px}
.pager a:hover{box-shadow:var(--shadow)}
.pager a span{font-size:.8rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.pager a b{font-family:var(--f-head);color:var(--ink);font-size:1.15rem}
.pager .next{text-align:right}

/* Home */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:18px}
.tool{text-decoration:none;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:24px;display:flex;flex-direction:column;gap:8px;transition:transform .15s ease, box-shadow .15s ease}
.block.alt .tool{background:var(--cream)}
.tool:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.tool .num{font-family:var(--f-head);font-weight:700;color:var(--accent)}
.tool h3{font-size:1.4rem;font-weight:700}
.tool p{color:var(--body)}
.tool .more{margin-top:auto;padding-top:6px;font-weight:700;color:var(--accent)}
.hero-home .wrap{grid-template-columns:minmax(0,1fr)}
.hero-home .lede{max-width:62ch}

/* Tables */
.tbl-wrap{overflow-x:auto;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md)}
.block.alt .tbl-wrap{background:var(--cream)}
table{width:100%;border-collapse:collapse;font-size:1rem}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
th{font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
td a{font-family:var(--f-head);font-weight:600;color:var(--ink);text-decoration:none}
td a:hover{color:var(--accent)}
td .num{color:var(--accent);font-weight:700}
td .crit{font-family:var(--f-head);font-weight:600;color:var(--ink)}

/* Flow */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:18px;counter-reset:flow}
.flow li{counter-increment:flow;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:22px 24px;display:flex;flex-direction:column;gap:6px;position:relative}
.flow .step{font-size:.85rem;font-weight:700;color:var(--accent)}
.flow .step::before{content:"Step " counter(flow) " · "}
.flow .step a{color:inherit}
.flow h3{font-size:1.2rem;font-weight:600}

/* Footer */
.foot{background:var(--navy);color:var(--on-navy-muted);text-align:center;padding:32px 16px;display:flex;flex-direction:column;gap:4px;font-size:.9rem}
.foot-brand{font-family:var(--f-head);font-weight:700;font-size:1.1rem;color:var(--on-navy);text-decoration:none}

@media (max-width:820px){
  .hero .wrap,.tips-layout{grid-template-columns:minmax(0,1fr)}
  .hero{padding:40px 0 48px}
  .block{padding:40px 0}
  .pager .next{text-align:left}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{
  .bar,.toolnav,.pager,.skip,.btn{display:none!important}
  body{background:#fff}
  .hero{background:#fff;color:#16213A}
  .hero h1,.fact p{color:#16213A}
}