:root{--sky:#1a1530;--sky2:#221a35;--wall:#3a2b4a;--building:#2a2342;--ink:#0f1424;--paper:#f4efe6;--amber:#ffb627;--amber-d:#d98e12;--dusk:#ff8a4c;--muted:#b9b0c9;--r:18px;
--fh:'League Gothic',Impact,'Arial Narrow',sans-serif;--fm:'JetBrains Mono',ui-monospace,monospace;--fb:'Montserrat',system-ui,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--sky);color:var(--paper);font:500 16px/1.6 var(--fb);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video{max-width:100%;display:block}a{color:inherit}
.amber{color:var(--amber)}.muted{color:var(--muted)}.center{text-align:center;margin-top:2.5rem}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;z-index:99;background:var(--amber);color:var(--ink);padding:.5rem 1rem}
.btn{display:inline-flex;align-items:center;gap:.6rem;background:var(--amber);color:var(--ink);font:900 1rem/1 var(--fb);text-transform:uppercase;letter-spacing:.02em;text-decoration:none;padding:1rem 1.5rem;border-radius:999px;border:3px solid var(--ink);box-shadow:0 5px 0 var(--amber-d),0 10px 30px rgba(255,182,39,.25);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-2px);box-shadow:0 7px 0 var(--amber-d),0 14px 36px rgba(255,182,39,.35)}.btn:active{transform:translateY(3px);box-shadow:0 2px 0 var(--amber-d)}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid #fff;outline-offset:3px}
.btn-ghost{background:transparent;color:var(--paper);border-color:rgba(244,239,230,.4);box-shadow:none}.btn-ghost:hover{border-color:var(--amber);color:var(--amber);box-shadow:none}
.btn-sm{padding:.6rem 1rem;font-size:.8rem;box-shadow:0 3px 0 var(--amber-d)}
.tag,.ysi-label{font:700 .78rem/1 var(--fm);letter-spacing:.14em;color:var(--amber)}
.hud{position:relative;background:rgba(15,20,36,.82);border:1px solid rgba(255,182,39,.25);border-radius:10px;padding:1rem 1.2rem}
.hud::before,.hud::after{content:"";position:absolute;width:14px;height:14px;border:3px solid var(--amber)}
.hud::before{top:-2px;left:-2px;border-right:0;border-bottom:0;border-top-left-radius:8px}.hud::after{bottom:-2px;right:-2px;border-left:0;border-top:0;border-bottom-right-radius:8px}
/* nav */
.nav{position:fixed;inset:0 0 auto;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 1rem;background:rgba(26,21,48,.6);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.06)}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;font:400 1.6rem/1 var(--fh);letter-spacing:.02em}.brand img{border-radius:50%}
.nav nav{display:none;gap:1.8rem}.nav nav a{text-decoration:none;font:700 .8rem var(--fm);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.nav nav a:hover{color:var(--amber)}
@media(min-width:760px){.nav{padding:.8rem 2rem}.nav nav{display:flex}}
/* hero */
.hero{position:relative;min-height:100svh;display:grid;align-items:center;padding:6rem 1.25rem 4rem;overflow:hidden;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:-1}
.hero-video{width:100%;height:100%;object-fit:cover;object-position:35% 50%;transform:scale(1.08)}
.hero-shade{position:absolute;inset:0;background:radial-gradient(ellipse at 75% 20%,rgba(255,138,76,.28),transparent 55%),linear-gradient(180deg,rgba(26,21,48,.55),rgba(26,21,48,.75) 55%,var(--sky))}
.stars{position:absolute;inset:0;background-image:radial-gradient(1.5px 1.5px at 12% 20%,#fff8,transparent),radial-gradient(1.5px 1.5px at 70% 12%,#fff9,transparent),radial-gradient(1px 1px at 40% 35%,#fff7,transparent),radial-gradient(2px 2px at 88% 40%,#ffd08a,transparent),radial-gradient(1px 1px at 25% 60%,#fff6,transparent);animation:tw 6s ease-in-out infinite alternate}
@keyframes tw{to{opacity:.4}}
.hero-in{max-width:1180px;width:100%;margin:0 auto}
.hero-hud{display:inline-flex;align-items:center;gap:.5rem;font:700 .75rem var(--fm);letter-spacing:.12em;padding:.55rem .9rem}
.dot{width:9px;height:9px;border-radius:50%;background:#ff5a3c;box-shadow:0 0 10px #ff5a3c;animation:pulse 1.4s infinite}@keyframes pulse{50%{opacity:.3}}
.hero-title{font:400 clamp(5rem,24vw,13rem)/.85 var(--fh);margin:1.2rem 0 .6rem;letter-spacing:.01em;text-shadow:0 6px 0 rgba(15,20,36,.6)}
.hero-title .ln{display:inline-block}
.hero-title .amber{text-shadow:0 6px 0 var(--ink),0 0 50px rgba(255,182,39,.45)}
.hero-q{font:900 clamp(1.5rem,5.5vw,2.6rem)/1.15 var(--fb);margin:.4rem 0}
.rot{display:inline-block;color:var(--ink);background:var(--amber);padding:0 .35em;border-radius:8px;transform:rotate(-2deg)}
.hero-sub{max-width:34rem;color:#ddd5e8;font-size:1.05rem}
.hero-cta{display:flex;flex-wrap:wrap;gap:1rem;margin-top:1.6rem}
.scroll-hint{position:absolute;bottom:1.2rem;left:50%;translate:-50%;font:700 1.4rem var(--fm);color:var(--amber);animation:bob 1.6s ease-in-out infinite}@keyframes bob{50%{transform:translateY(8px)}}
/* sections */
.sec{padding:5rem 1.25rem;max-width:1240px;margin:0 auto}
.sec-alt{max-width:none;background:radial-gradient(ellipse at 20% 0%,rgba(255,138,76,.12),transparent 50%),var(--sky2)}
.sec-alt>*{max-width:1200px;margin-left:auto;margin-right:auto}
.sec-head{margin-bottom:2.5rem}.sec-head h2,.guide h2{font:400 clamp(3rem,10vw,5.5rem)/.9 var(--fh);margin:.6rem 0;letter-spacing:.01em}.sec-head p{color:var(--muted);max-width:40rem;margin:0}
.grid{display:grid;gap:1.5rem;grid-template-columns:1fr}
@media(min-width:640px){.grid{grid-template-columns:repeat(2,1fr)}}@media(min-width:1000px){.grid{grid-template-columns:repeat(3,1fr)}}
.ep{background:var(--building);border-radius:var(--r);overflow:hidden;border:1px solid rgba(255,255,255,.07);transition:transform .25s,border-color .25s,box-shadow .25s;display:flex;flex-direction:column}
.ep:hover{transform:translateY(-6px);border-color:rgba(255,182,39,.5);box-shadow:0 20px 40px rgba(0,0,0,.35)}
.ep-media{position:relative;aspect-ratio:16/9;background:var(--ink)}.ep-media img,.ep-media iframe{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border:0}
.ep-play{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(transparent 50%,rgba(15,20,36,.5));border:0;cursor:pointer;padding:0}
.play-ic{width:64px;height:64px;border-radius:50%;background:var(--amber);border:3px solid var(--ink);box-shadow:0 4px 0 var(--amber-d);position:relative;transition:transform .2s}
.play-ic::after{content:"";position:absolute;left:24px;top:17px;border-left:20px solid var(--ink);border-top:12px solid transparent;border-bottom:12px solid transparent}
.ep:hover .play-ic{transform:scale(1.12)}
.ep-body{padding:1.1rem 1.2rem 1.3rem;display:flex;flex-direction:column;flex:1}
.ep-num{font:700 .72rem var(--fm);letter-spacing:.14em;color:var(--amber)}
.ep h3{font:900 1.15rem/1.25 var(--fb);margin:.35rem 0 .5rem}.ep p{color:var(--muted);font-size:.92rem;margin:0 0 1rem;flex:1}
.ep-link{font:700 .8rem var(--fm);color:var(--amber);text-decoration:none}.ep-link:hover{text-decoration:underline}
/* science */
.steps{list-style:none;padding:0;display:grid;gap:1.2rem;grid-template-columns:1fr;margin-bottom:2.5rem}@media(min-width:800px){.steps{grid-template-columns:repeat(3,1fr)}}
.step{background:rgba(58,43,74,.55);border-radius:var(--r);padding:1.5rem;border-top:4px solid var(--amber)}
.step-n{font:400 3.4rem/1 var(--fh);color:var(--amber)}.step h3{font:900 1.2rem var(--fb);margin:.3rem 0}.step p{margin:0;color:var(--muted)}
.facts{display:grid;gap:1.2rem;grid-template-columns:1fr}@media(min-width:640px){.facts{grid-template-columns:repeat(2,1fr)}}
.fact p{margin:.6rem 0;font-weight:700}.fact small{color:var(--muted);font:400 .75rem var(--fm)}
/* guide */
.guide{position:relative;max-width:none;overflow:hidden;background:radial-gradient(circle at 80% 15%,rgba(170,160,230,.25),transparent 40%),linear-gradient(#1a1530,#120f24)}
.moon{position:absolute;width:420px;height:420px;right:-120px;top:-120px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#fff,#d9d4f5 55%,#b6aee6);opacity:.16;filter:blur(1px)}
.guide-in{position:relative;max-width:1200px;margin:0 auto;display:grid;gap:3rem;align-items:center}@media(min-width:900px){.guide-in{grid-template-columns:1fr 1fr}}
.guide-art{position:relative;padding-bottom:12%}
.g-cover{width:82%;border-radius:14px;box-shadow:0 30px 60px rgba(0,0,0,.5);transform:rotate(-3deg);border:3px solid var(--ink)}
.g-prev{position:absolute;width:55%;right:0;bottom:0;border-radius:10px;box-shadow:0 20px 40px rgba(0,0,0,.5);transform:rotate(4deg);border:3px solid var(--ink)}
.g-hook{font:700 1.2rem/1.45 var(--fb)}
.g-list{list-style:none;padding:0;margin:1.2rem 0 1.8rem}.g-list li{padding:.55rem 0 .55rem 2.2rem;position:relative;font-weight:700}
.g-list li::before{content:"✓";position:absolute;left:0;top:.45rem;width:1.5rem;height:1.5rem;display:grid;place-items:center;border-radius:50%;background:var(--amber);color:var(--ink);font-size:.85rem;font-weight:900}
.g-buy{display:flex;align-items:center;gap:1.4rem;flex-wrap:wrap;margin-bottom:.8rem}.price{font:400 3.6rem/1 var(--fh);color:var(--amber)}
/* footer */
.foot{background:#0f0c1e;padding:3rem 1.25rem;border-top:1px solid rgba(255,255,255,.06)}
.foot-in{max-width:1200px;margin:0 auto;display:grid;gap:1rem}.foot p{margin:0;color:var(--muted)}
.foot-links{display:flex;flex-wrap:wrap;gap:.6rem 1.6rem}.foot-links a{font:700 .82rem var(--fm);text-decoration:none;color:var(--paper)}.foot-links a:hover{color:var(--amber)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.hero-video{display:none}.hero-bg{background:url(../video/hero-poster.webp) 35% 50%/cover}}