/* style.css, the landing page (index.html) and the placeholder page (ai.html).
   Same restraint as learn.css: hairlines, whitespace, one accent, nothing blinking.
   Colours all come from tokens.css. */


*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  font-family:"Inter","Inter Fallback",system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--text);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
  min-height:100vh;display:flex;flex-direction:column;
}
h1,h2,h3{font-weight:600;letter-spacing:-.015em;line-height:1.25}
a{color:var(--accent-text);text-underline-offset:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

.skip{position:absolute;left:12px;top:-60px;z-index:50;background:var(--ink);color:var(--on-ink);
  padding:8px 14px;border-radius:8px;text-decoration:none;font-size:.9rem}
.skip:focus{top:12px}

/* ---------- nav (shared) ---------- */
.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 92%,transparent);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
.nav::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad)}
.nav-in{max-width:760px;margin:0 auto;padding:11px 22px;display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.brand{text-decoration:none;color:var(--text);font-weight:600;font-size:.95rem;letter-spacing:-.01em}
.brand-mark span{color:var(--accent-text)}
.brand-sub{font-size:.8rem;color:var(--muted);font-weight:400}
.sp{flex:1}
.nav-in.center{align-items:center}
.brand-row{display:flex;align-items:center;gap:10px}
.btn{background:none;border:0;padding:2px 0;font-family:inherit;font-size:.82rem;
  color:var(--muted);text-decoration:none;cursor:pointer;white-space:nowrap}
.btn:hover{color:var(--text)}

.wrap{max-width:760px;margin:0 auto;padding:52px 22px 80px;width:100%;flex:1}

/* placeholder page */
.soon-card{padding:64px 0;max-width:56ch}
.soon-card h1{font-size:1.8rem;margin-bottom:14px}
.soon-card p{
  color:var(--muted);font-size:1.06rem;line-height:1.7;margin-bottom:22px;
  font-family:"Source Serif 4","Source Serif Fallback","Iowan Old Style",Georgia,serif;
}
.soon-card .icon{display:none}

footer{max-width:760px;margin:0 auto;width:100%;padding:22px 22px 40px;
  border-top:1px solid var(--rule);color:var(--faint);font-size:.8rem}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--text)}

/* ================= landing page ================= */
.wide{max-width:1120px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px;width:100%}

.landing .nav-in{max-width:1120px;padding:12px 24px;align-items:center;flex-wrap:nowrap}
.landing .brand{display:flex;align-items:center;gap:10px;font-size:1rem}
.brand-logo{display:block;border-radius:22%}
.foot-brand{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--text)}
.nav-links{display:flex;gap:22px;margin-left:auto}
.nav-links a{color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500}
.nav-links a:hover{color:var(--text)}
.theme-btn{font:500 .82rem/1 inherit;font-family:inherit;color:var(--text-2);background:transparent;
  border:1px solid var(--rule-2);border-radius:999px;padding:8px 14px;cursor:pointer;min-height:36px}
.theme-btn:hover{border-color:var(--text-2)}

/* hero */
.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;padding-top:72px;padding-bottom:80px}
.eyebrow{font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-text);margin-bottom:18px}
.hero h1{text-wrap:balance;font-size:clamp(2.2rem,5.2vw,3.6rem);line-height:1.06;letter-spacing:-.035em;font-weight:800;margin-bottom:22px}
.nw{white-space:nowrap}
.grad{background:linear-gradient(90deg,#e8401a 0%,#D82424 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
[data-theme="dark"] .grad{background-image:linear-gradient(90deg,#F2C31E 0%,#F5A623 45%,#F0600C 100%)}
.lede{font-size:1.12rem;line-height:1.7;color:var(--text-2);max-width:56ch;margin-bottom:30px}

.cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:40px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;
  border-radius:12px;font-weight:600;font-size:.98rem;text-decoration:none;transition:transform .15s ease,background .15s ease}
.button.primary{background:var(--ink);color:var(--on-ink)}
.button.primary:hover{transform:translateY(-1px)}
.button.ghost{color:var(--text);border:1px solid var(--rule-2)}
.button.ghost:hover{border-color:var(--text-2)}

.stats{list-style:none;display:grid;grid-template-columns:repeat(4,auto);justify-content:start;gap:8px 34px}
.stats li{display:flex;flex-direction:column}
.stats b{font-size:1.7rem;font-weight:700;letter-spacing:-.02em;line-height:1.1}
.stats span{font-size:.82rem;color:var(--muted)}

/* the 8-step flow card */
.flow{position:relative;background:var(--card);border:1px solid var(--rule);border-radius:18px;padding:22px 22px 10px;
  box-shadow:0 1px 0 var(--rule),0 24px 48px -28px rgba(0,0,0,.25)}
.flow::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;border-radius:18px 18px 0 0;background:var(--grad)}
.flow figcaption{font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.flow ol{list-style:none}
.flow li{display:flex;gap:14px;align-items:baseline;padding:10px 0;border-top:1px solid var(--rule)}
.flow li:first-child{border-top:0}
.flow .n{font:600 .75rem/1 "JetBrains Mono","JetBrains Mono Fallback",ui-monospace,monospace;color:var(--accent-text);min-width:20px}
.flow b{display:block;font-size:.95rem;font-weight:600}
.flow small{display:block;font-size:.84rem;color:var(--muted);line-height:1.45}

/* bands */
.band{background:var(--bg-soft);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:72px 0}
.sec-h{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.025em;margin-bottom:32px}

.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.steps li{position:relative}
.step-n{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;
  background:var(--grad);color:#fff;font-weight:700;font-size:.9rem;margin-bottom:14px;text-shadow:0 1px 1px rgba(0,0,0,.25)}
.steps h3{font-size:1.15rem;margin-bottom:6px}
.steps p{color:var(--text-2);font-size:.97rem}

/* cards */
.inside{padding-top:80px;padding-bottom:80px}
.group-h{font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:34px 0 14px}
.group-h:first-of-type{margin-top:0}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.cards.three{grid-template-columns:repeat(3,1fr)}
.card{display:flex;flex-direction:column;gap:6px;padding:22px;border:1px solid var(--rule);border-radius:14px;
  background:var(--card);color:inherit;text-decoration:none;transition:border-color .15s ease,transform .15s ease}
.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card strong{font-size:1.06rem;font-weight:600}
.card strong::after{content:" →";color:var(--faint);transition:color .15s ease}
.card:hover strong::after{color:var(--accent)}
.card>span:last-child{color:var(--muted);font-size:.92rem;line-height:1.55}
.card.feature{padding:26px}
.card.feature strong{font-size:1.25rem}
.tag{align-self:flex-start;font-size:.72rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;
  color:var(--accent-text);background:color-mix(in srgb,var(--accent) 12%,transparent);padding:4px 9px;border-radius:999px;margin-bottom:6px}
.card.muted{background:transparent;border-style:dashed}
.soon{font-style:normal;font-size:.72rem;font-weight:500;color:var(--muted);border:1px solid var(--rule-2);
  border-radius:999px;padding:2px 8px;margin-left:6px;vertical-align:2px}

.principles{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.principles h3{font-size:1.02rem;margin-bottom:8px;padding-top:14px;border-top:2px solid var(--accent)}
.principles p{color:var(--text-2);font-size:.93rem}

.closer{text-align:center;padding-top:88px;padding-bottom:96px}
.closer h2{font-size:clamp(1.6rem,3.4vw,2.3rem);letter-spacing:-.03em;margin-bottom:10px}
.closer p{color:var(--muted);margin:0 auto 26px;max-width:48ch}

.site-foot{max-width:none;padding:0;border-top:1px solid var(--rule);color:var(--muted)}
.foot-in{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;padding-top:26px;padding-bottom:34px}
.foot-in nav{display:flex;flex-wrap:wrap;gap:6px 20px;flex:1}
.foot-in nav a{color:var(--muted);font-size:.88rem}
.foot-in small{color:var(--muted);font-size:.82rem}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero{grid-template-columns:1fr;gap:44px;padding-top:52px;padding-bottom:60px}
  .principles{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:720px){
  .nav-links{display:none}
  .theme-btn{margin-left:auto}
  .steps{grid-template-columns:1fr;gap:26px}
  .cards.three{grid-template-columns:1fr}
  .band{padding:56px 0}
  .inside{padding-top:60px;padding-bottom:60px}
}
@media (max-width:560px){
  .wide,.landing .nav-in{padding-left:16px;padding-right:16px}
  .hero{padding-top:40px}
  .lede{font-size:1.03rem}
  .eyebrow{font-size:.72rem;letter-spacing:.04em}
  .cta .button{flex:1 1 100%}
  .stats{grid-template-columns:repeat(2,1fr);gap:18px 20px}
  .cards,.cards.three,.principles{grid-template-columns:1fr}
  .closer{padding-top:64px;padding-bottom:72px}
}