/* YzzyStudy site (home, legal pages, 404).
   Palette from the logo: navy for text and structure, orange only for the
   rising-arrow motif and small accents. Warm paper background, calm bands. */
:root{
  --paper:#f7f5f0; --surface:#ffffff; --ink:#132c4a; --text:#28313f; --muted:#535c6b;
  --rule:#e3ded3; --rule-2:#d3ccbe;
  --accent:#f07a1f;          /* the logo's orange: graphics, never body text */
  --accent-ink:#a64a0b;      /* orange dark enough for small text */
  --sky:#eaf1f6; --sage:#ecf3ee; --sun:#fdf1e4;
  --logo-accent:#f07a1f;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif;
  --r:16px; color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --paper:#0f1826; --surface:#162235; --ink:#e7edf5; --text:#d4dbe6; --muted:#a3afc0;
  --rule:#243349; --rule-2:#31435d; --accent:#f59240; --accent-ink:#f7a765;
  --sky:#132338; --sage:#132a26; --sun:#2a2014; --logo-accent:#f59240; color-scheme:dark}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(76px + env(safe-area-inset-top,0px))}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--text);font:17px/1.65 var(--sans);-webkit-font-smoothing:antialiased;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
a{color:var(--ink);text-underline-offset:3px}
:focus-visible{outline:3px solid #2f6fd6;outline-offset:3px;border-radius:6px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;border-radius:8px;z-index:20}
.skip:focus{left:12px}

/* logo */
.yz-mark{height:34px;width:auto;color:var(--ink);display:block}
.yz-word{height:19px;width:auto;color:var(--ink);display:block}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}

/* navigation */
.nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--paper) 92%,transparent);
  backdrop-filter:saturate(1.2) blur(8px);-webkit-backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid transparent}
.nav.scrolled{border-bottom-color:var(--rule)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.nav nav{display:flex;align-items:center;gap:26px}
.nav nav a{text-decoration:none;color:var(--muted);font-weight:550;font-size:15px}
.nav nav a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:12px;
  font:650 16px var(--sans);text-decoration:none;border:1.5px solid var(--rule-2);color:var(--ink);background:var(--surface);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(19,44,74,.10)}
.btn.solid{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn.small{min-height:42px;padding:0 16px;font-size:15px}
@media (prefers-reduced-motion:reduce){.btn{transition:none}.btn:hover{transform:none}}

/* hero */
.hero{position:relative;padding:64px 0 40px;overflow:hidden}
.hero .hero-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:52px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:700 13px var(--sans);letter-spacing:.07em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 16px}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--accent);border-radius:2px}
h1{font:800 clamp(38px,5.4vw,60px)/1.06 var(--sans);color:var(--ink);letter-spacing:-.025em;margin:0 0 20px}
h1 .u{background:linear-gradient(transparent 70%,color-mix(in srgb,var(--accent) 38%,transparent) 70%,color-mix(in srgb,var(--accent) 38%,transparent) 92%,transparent 92%)}
.lede{font-size:clamp(18px,2vw,20px);color:var(--muted);max-width:34em;margin:0 0 28px}
.cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.fine{font-size:14px;color:var(--muted);margin:14px 0 0}
.shot{position:relative;background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);padding:10px;
  box-shadow:0 1px 2px rgba(19,44,74,.05),0 18px 44px rgba(19,44,74,.10)}
.shot img{border-radius:10px}
.shot.tilt{transform:rotate(-1.2deg)}
.hero-art{position:relative}
.hero-art .line{position:absolute;left:-8%;top:-18%;width:118%;height:auto;z-index:-1;color:var(--accent)}

/* facts */
.facts{display:grid;grid-template-columns:repeat(5,1fr);gap:0;background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);margin-top:64px}
.facts div{padding:18px 20px;border-left:1px solid var(--rule)}
.facts div:first-child{border-left:0}
.facts b{display:block;font:800 30px/1.1 var(--sans);color:var(--ink);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.facts span{font-size:14px;color:var(--muted)}
.facts-note{font-size:14px;color:var(--muted);margin:10px 2px 0}

/* sections */
section{padding:84px 0}
.band-sky{background:var(--sky)} .band-sage{background:var(--sage)} .band-sun{background:var(--sun)}
h2{font:800 clamp(28px,3.6vw,40px)/1.15 var(--sans);color:var(--ink);letter-spacing:-.02em;margin:0 0 14px}
.sub{color:var(--muted);font-size:19px;max-width:40em;margin:0 0 40px}
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pain{background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);padding:24px}
.pain q{display:block;font:700 19px/1.4 var(--sans);color:var(--ink);quotes:"“" "”";margin-bottom:10px}
.pain p{margin:0;color:var(--muted);font-size:16px}
.bridge{margin:30px 0 0;font-size:19px;color:var(--ink);font-weight:600}

.feature{display:grid;grid-template-columns:.9fr 1.2fr;gap:52px;align-items:center;margin:0 0 96px}
.feature.flip{grid-template-columns:1.2fr .9fr}
.feature:last-child{margin-bottom:0}
.feature.flip .text{order:2}
.feature h3{font:800 clamp(24px,2.8vw,30px)/1.2 var(--sans);color:var(--ink);letter-spacing:-.015em;margin:0 0 12px}
.feature p{margin:0 0 14px;color:var(--text)}
.feature .tag{display:inline-block;font:700 12.5px var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:10px}
.ticks{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:8px}
.ticks li{position:relative;padding-left:28px;color:var(--text)}
.ticks li::before{content:"";position:absolute;left:0;top:.45em;width:16px;height:9px;border-left:2.5px solid var(--accent);border-bottom:2.5px solid var(--accent);transform:rotate(-45deg)}
.fade-bottom{-webkit-mask-image:linear-gradient(#000 78%,transparent);mask-image:linear-gradient(#000 78%,transparent)}

.small-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:8px}
.mini{background:var(--surface);border:1px solid var(--rule);border-radius:14px;padding:20px}
.mini svg{width:26px;height:26px;color:var(--ink);margin-bottom:10px}
.mini svg .a{color:var(--accent)}
.mini h4{margin:0 0 6px;font:700 16.5px var(--sans);color:var(--ink)}
.mini p{margin:0;color:var(--muted);font-size:15px}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.step{background:var(--surface);border:1px solid var(--rule);border-radius:var(--r);padding:26px;position:relative}
.step::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:36px;height:36px;border-radius:50%;
  background:var(--ink);color:var(--paper);font:800 16px var(--sans);margin-bottom:14px}
.step h3{margin:0 0 8px;font:700 19px var(--sans);color:var(--ink)}
.step p{margin:0;color:var(--muted)}

.promises{display:grid;grid-template-columns:repeat(2,1fr);gap:16px 40px;max-width:900px}
.promise{display:flex;gap:14px}
.promise svg{flex:none;width:24px;height:24px;margin-top:3px;color:var(--accent)}
.promise b{color:var(--ink)}
.promise p{margin:0}

.faq{max-width:820px}
.faq details{border-top:1px solid var(--rule);padding:4px 0}
.faq details:last-child{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center;min-height:60px;
  font:650 18px var(--sans);color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:400 26px var(--sans);color:var(--accent-ink);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 18px;color:var(--text);max-width:44em}

.final{text-align:center}
.final .wrap{max-width:760px}
.final h2{margin-bottom:12px}
.final p{color:var(--muted);font-size:19px;margin:0 0 28px}

footer{border-top:1px solid var(--rule);padding:36px 0 48px;color:var(--muted);font-size:14.5px}
footer .wrap{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:start}
footer nav{display:flex;gap:20px;flex-wrap:wrap}
footer p{margin:10px 0 0;max-width:46em}

/* legal pages and 404 */
.legal{max-width:760px;margin:0 auto;padding:24px 22px 70px}
.legal h1{font-size:clamp(32px,5vw,44px)}
.legal h2{font-size:22px;margin-top:34px}
.legal .updated{color:var(--muted);font-size:14.5px}

@media (max-width:900px){
  .hero .hero-grid,.feature,.feature.flip{grid-template-columns:1fr;gap:34px}
  .feature.flip .text{order:0}
  .facts{grid-template-columns:repeat(2,1fr)}
  .facts div{border-left:0;border-top:1px solid var(--rule)}
  .facts div:nth-child(-n+2){border-top:0}
  .facts div:nth-child(odd){border-right:1px solid var(--rule)}
  .facts div:last-child{grid-column:1 / -1;border-right:0}
  .pains,.steps,.small-grid,.promises{grid-template-columns:1fr}
  .nav nav a:not(.btn){display:none}
  section{padding:60px 0}
  .feature{margin-bottom:64px}
  footer .wrap{grid-template-columns:1fr}
}
@media (min-width:901px) and (max-width:1100px){.small-grid{grid-template-columns:repeat(2,1fr)}}
@media (prefers-color-scheme:dark){.shot img{filter:brightness(.9)}}