:root{--bg:#fff;--ink:#212121;--slate:#6b6b80;--green:#003c33;--stone:#eeece7;--wash:#edfce9;--blue:#1863dc;--coral:#ff7759;--hair:#e5e7eb;--card:#fff;--soft:#faf9f6;--body2:#444;--btn-bg:#212121;--btn-fg:#fff;--btn-hover:#000;--foot:#17171c;--r:16px;--font-d:"Space Grotesk","Inter",system-ui,sans-serif;--font-b:"Inter",system-ui,sans-serif;--font-m:"JetBrains Mono",ui-monospace,monospace;color-scheme:light}
:root[data-theme=dark]{--bg:#0e1014;--ink:#ececf1;--slate:#9b9cb0;--green:#0a2f2a;--stone:#151820;--wash:#10261f;--blue:#7aa9ff;--hair:#2a2e38;--card:#151820;--soft:#1b1f29;--body2:#c4c5d0;--btn-bg:#ececf1;--btn-fg:#111;--btn-hover:#fff;--foot:#0a0b0e;color-scheme:dark}
@media(prefers-color-scheme:dark){:root:not([data-theme]){--bg:#0e1014;--ink:#ececf1;--slate:#9b9cb0;--green:#0a2f2a;--stone:#151820;--wash:#10261f;--blue:#7aa9ff;--hair:#2a2e38;--card:#151820;--soft:#1b1f29;--body2:#c4c5d0;--btn-bg:#ececf1;--btn-fg:#111;--btn-hover:#fff;--foot:#0a0b0e;color-scheme:dark}}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;font:16px/1.55 var(--font-b);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:var(--font-d);font-weight:500;line-height:1.1;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2.4rem,6vw,4.2rem)}h2{font-size:clamp(1.8rem,4vw,2.8rem)}h3{font-size:1.35rem}
a{color:var(--blue)}p{margin:0 0 1em}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.eyebrow{font:500 .78rem var(--font-m);text-transform:uppercase;letter-spacing:.08em;color:var(--slate);margin-bottom:12px;display:block}
.nav{position:sticky;top:0;background:var(--bg);border-bottom:1px solid var(--hair);z-index:10}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font:500 1.05rem var(--font-d);color:var(--ink);text-decoration:none}
.brand img{width:30px;height:30px}
.nav nav{display:flex;gap:22px;align-items:center}
.nav nav a{color:var(--ink);text-decoration:none;font-size:.95rem}
.nav nav a:hover{color:var(--blue)}
.nav nav a[aria-current=page]{text-decoration:underline;text-underline-offset:6px}
.btn,.nav nav a.btn{display:inline-block;background:var(--btn-bg);color:var(--btn-fg);padding:12px 22px;border-radius:32px;text-decoration:none;font-weight:500;border:0;cursor:pointer;font-size:.95rem;font-family:inherit}
.btn:hover,.nav nav a.btn:hover{background:var(--btn-hover);color:var(--btn-fg)}
.btn.alt,.nav nav a.btn.alt{background:transparent;color:var(--ink);border:1px solid var(--ink)}
.btn.alt:hover{background:var(--soft);color:var(--ink)}
.btn.block{display:block;text-align:center;width:100%}
.nav nav a.btn{padding:10px 20px}
.theme-toggle{width:38px;height:38px;border-radius:50%;border:1px solid var(--hair);background:transparent;color:var(--ink);display:grid;place-items:center;cursor:pointer;padding:0}
.theme-toggle:hover{background:var(--soft)}
.theme-toggle svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .sun{display:none}
:root[data-theme=dark] .theme-toggle .sun{display:block}:root[data-theme=dark] .theme-toggle .moon{display:none}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.hero{padding:88px 0 72px}.hero p.lead{font-size:1.2rem;color:var(--slate);max-width:640px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.band{padding:80px 0}.band.stone{background:var(--stone)}.band.green{background:var(--green);color:#fff}.band.green .eyebrow{color:#9fd3c7}
.grid{display:grid;gap:20px}.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.card{background:var(--card);border:1px solid var(--hair);border-radius:var(--r);padding:28px;display:flex;flex-direction:column}
.card.feature{border-color:var(--ink)}
.meta{font:.8rem var(--font-m);color:var(--slate);margin-bottom:12px}
.card ul{padding-left:18px;margin:0 0 20px;color:var(--body2)}.card li{margin-bottom:6px}
.card .push{margin-top:auto}
.card .more{font-size:.9rem;margin:0 0 16px}
.price{font:500 2rem var(--font-d)}.price small{font:.85rem var(--font-b);color:var(--slate)}
.opts{display:grid;gap:8px;margin:12px 0 16px}
.opt{display:flex;justify-content:space-between;align-items:center;border:1px solid var(--hair);border-radius:12px;padding:10px 14px;font-size:.92rem;cursor:pointer}
.opt input{margin-right:8px}.opt:has(input:checked){border-color:var(--ink);background:var(--soft)}
details{border-bottom:1px solid var(--hair);padding:16px 0}summary{cursor:pointer;font:500 1.05rem var(--font-d)}details p{margin:10px 0 0;color:var(--body2)}
.steps{counter-reset:s;list-style:none;padding:0}.steps li{counter-increment:s;padding:0 0 18px 48px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:50%;background:var(--coral);color:#fff;display:grid;place-items:center;font:500 .9rem var(--font-m)}
form label{display:block;font-size:.9rem;margin:14px 0 6px}
input[type=text],input[type=email],input[type=password],textarea,select{width:100%;padding:12px;border:1px solid var(--hair);border-radius:10px;font:inherit;background:var(--card);color:var(--ink)}
.footer{background:var(--foot);color:#c9c9d0;padding:56px 0 32px;font-size:.9rem;border-top:1px solid var(--hair)}.footer a{color:#fff}.footer .cols{display:flex;gap:40px;flex-wrap:wrap;justify-content:space-between}
.footer .addr{max-width:320px;line-height:1.6}.footer .links{line-height:1.9}.footer .links strong{color:#fff;display:block;margin-bottom:4px}
.legal{max-width:760px;padding:56px 20px 80px;margin:0 auto}.legal h2{font-size:1.4rem;margin-top:1.6em}
.note{background:var(--wash);border-radius:12px;padding:14px 18px;font-size:.92rem}
.card details{border:0;padding:0 0 16px}.card details summary{font:500 .95rem var(--font-b);color:var(--blue)}.card details ol{padding-left:20px;margin:10px 0}.card details p{font-size:.9rem}

/* Content pages: blog, courses, about */
.page-head{padding:64px 0 32px}.page-head h1{font-size:clamp(2rem,5vw,3.2rem);max-width:820px}
.page-head p.lead{font-size:1.15rem;color:var(--slate);max-width:680px}
.crumbs{font-size:.85rem;color:var(--slate);margin-bottom:20px}.crumbs a{color:var(--slate)}
.prose{max-width:760px;margin:0 auto;padding:0 20px 72px}
.prose h2{font-size:1.7rem;margin:1.8em 0 .5em}.prose h3{margin-top:1.4em}
.prose p,.prose li{font-size:1.05rem;color:var(--body2)}.prose li{margin-bottom:.4em}
.prose strong{color:var(--ink)}
.post-meta{font:.8rem var(--font-m);color:var(--slate);margin:0 0 28px}
.tablewrap{overflow-x:auto;margin:1.4em 0;border:1px solid var(--hair);border-radius:12px}
table.cmp{border-collapse:collapse;width:100%;min-width:560px;font-size:.93rem}
.cmp th,.cmp td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--hair);vertical-align:top}
.cmp thead th{background:var(--stone);font:500 .85rem var(--font-m);color:var(--ink)}
.cmp tbody th{font-weight:500;color:var(--ink);white-space:nowrap}.cmp td{color:var(--body2)}
.cmp tr:last-child th,.cmp tr:last-child td{border-bottom:0}
.verdict{background:var(--wash);border-radius:12px;padding:18px 22px;margin:1.6em 0}.verdict p{margin:0 0 .6em;color:var(--ink)}.verdict p:last-child{margin:0}
.cta-box{border:1px solid var(--hair);background:var(--card);border-radius:var(--r);padding:26px;margin:2.4em 0}.cta-box h3{margin-bottom:.3em}.cta-box p{margin-bottom:1em}
.disclose{font-size:.88rem;color:var(--slate);border-left:3px solid var(--hair);padding-left:14px;margin:1.6em 0}
.related{border-top:1px solid var(--hair);margin-top:2.4em;padding-top:1.4em}.related h2{font-size:1.2rem;margin:0 0 .6em}.related ul{padding-left:18px}
.post-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.post-card{background:var(--card);border:1px solid var(--hair);border-radius:var(--r);padding:24px;display:flex;flex-direction:column;text-decoration:none;color:var(--ink)}
.post-card:hover{border-color:var(--ink)}.post-card h3{font-size:1.25rem;margin:8px 0 .5em}.post-card p{color:var(--body2);font-size:.95rem;margin:0 0 1em}
.post-card .go{margin-top:auto;color:var(--blue);font-size:.9rem}
.tag{display:inline-block;font:500 .72rem var(--font-m);text-transform:uppercase;letter-spacing:.06em;color:var(--slate)}
.facts{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));margin:1.4em 0}.facts div{border:1px solid var(--hair);border-radius:12px;padding:14px 16px;background:var(--card)}.facts b{display:block;font:.75rem var(--font-m);color:var(--slate);text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px;font-weight:500}.facts span{color:var(--ink);font-weight:500}

/* App screens: auth, checkout, dashboard, course player */
.auth-card{max-width:440px;margin:56px auto 80px;background:var(--card);border:1px solid var(--hair);border-radius:var(--r);padding:32px}
.auth-card h1{font-size:1.8rem}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:var(--stone);padding:4px;border-radius:12px;margin-bottom:22px}
.tabs button{border:0;background:transparent;color:var(--ink);padding:10px;border-radius:9px;font:500 .92rem var(--font-b);cursor:pointer}.tabs button[aria-selected=true]{background:var(--card);box-shadow:0 1px 3px rgba(0,0,0,.18)}
.alert{background:#fde8e4;color:#8a1f0d;border-radius:10px;padding:10px 14px;font-size:.92rem;margin:14px 0 0}
:root[data-theme=dark] .alert{background:#3a1c16;color:#ffb4a3}
.alert a{color:inherit}.muted{color:var(--slate)}[hidden]{display:none!important}
.bar{height:8px;border-radius:99px;background:var(--hair);overflow:hidden;margin:6px 0 10px}.bar span{display:block;height:100%;background:var(--coral);border-radius:99px;transition:width .3s}
.checkout{display:grid;gap:28px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:start;padding-bottom:80px}
.summary{background:var(--card);border:1px solid var(--hair);border-radius:var(--r);padding:28px;position:sticky;top:88px}
.summary .total{font:500 1.15rem var(--font-d);margin:16px 0}.fine{font-size:.85rem;color:var(--slate)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.9rem;margin:14px 0}.check input{margin-top:4px}
.learn{display:grid;grid-template-columns:300px minmax(0,1fr);gap:32px;align-items:start;padding:28px 0 80px}
.side{position:sticky;top:88px;background:var(--card);border:1px solid var(--hair);border-radius:var(--r);padding:20px}
.side ol{list-style:none;margin:12px 0 0;padding:0;counter-reset:m}.side li{counter-increment:m;border-top:1px solid var(--hair)}
.side li a{display:flex;gap:10px;padding:10px 4px;color:var(--ink);text-decoration:none;font-size:.92rem}.side li a::before{content:counter(m);flex:0 0 24px;height:24px;border-radius:50%;border:1px solid var(--hair);display:grid;place-items:center;font:.75rem var(--font-m)}
.side li.done a::before{content:"✓";background:var(--coral);border-color:var(--coral);color:#fff}.side li a[aria-current=true]{font-weight:500;color:var(--blue)}
.lesson h1{font-size:clamp(1.6rem,3.5vw,2.4rem)}.video{aspect-ratio:16/9;background:var(--stone);border-radius:var(--r);overflow:hidden;margin:18px 0}.video:empty{display:none}.video iframe{width:100%;height:100%;border:0}
.lesson .nav-btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
@media(max-width:860px){.checkout,.learn{grid-template-columns:1fr}.summary,.side{position:static}}
@media(max-width:700px){.nav nav{gap:12px}.nav nav a,.brand{white-space:nowrap}.brand{font-size:.95rem;gap:8px}.nav nav a.btn{padding:8px 14px}.nav .wrap{gap:8px}.nav nav a.hide-m{display:none}.hero{padding:56px 0 48px}.band{padding:56px 0}.page-head{padding:40px 0 20px}.footer .cols{gap:28px}}
@media(max-width:420px){.brand{font-size:0}.brand img{width:34px;height:34px}}