/* Carrera de la Máquina 7K — responsive landing page */
:root{--bg:#03070c;--cyan:#00eaff;--magenta:#ff00c8;--white:#f7f8fb;--content:1120px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--white);font-family:Arial,Helvetica,sans-serif}
.site-header{height:72px;padding:8px clamp(14px,4vw,54px);display:flex;align-items:center;justify-content:space-between;gap:20px;background:#030609;border-bottom:1px solid var(--cyan);position:relative;z-index:5}
.brand{display:block;width:155px;max-width:22vw;overflow:hidden}
.brand-art{display:block;width:100%;height:50px;object-fit:cover;object-position:10% 8%;filter:grayscale(1) contrast(1.4)}
.tagline{font-size:clamp(9px,1.5vw,15px);letter-spacing:.22em;font-weight:800;font-style:italic;text-align:center;margin:0}
.menu-toggle{border:0;background:transparent;color:white;font-size:30px;line-height:1;cursor:pointer;display:none}
.main-nav{display:flex;gap:20px}.main-nav a{color:white;text-decoration:none;font-size:13px;font-weight:700}.main-nav a:hover{color:var(--cyan)}
.hero{position:relative;width:100%;overflow:hidden;background:#02060b}
.hero-slides{position:relative;width:100%;aspect-ratio:941/570;max-height:78vh}
.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .8s ease;pointer-events:none}
.hero-slide.active{opacity:1}
.hero-slide img{display:block;width:100%;height:100%;object-fit:contain;object-position:center top}
.hero-cta{position:absolute;left:5.7%;top:70%;z-index:2}
.neon-button{display:inline-flex;align-items:center;gap:18px;padding:12px 25px;color:#fff;text-decoration:none;font-weight:900;font-style:italic;letter-spacing:.04em;font-size:clamp(13px,2.2vw,24px);background:rgba(1,8,15,.9);border:3px solid var(--cyan);border-right-color:var(--magenta);border-radius:4px 18px 4px 18px;box-shadow:0 0 15px #00eaff55, inset 0 0 12px #ff00c833;transform:skew(-7deg);transition:transform .2s,box-shadow .2s}
.neon-button span{font-size:1.5em;line-height:.6}.neon-button:hover{box-shadow:0 0 22px #00eaffaa;transform:skew(-7deg) scale(1.03)}
.hero-dots{position:absolute;bottom:14px;right:18px;display:flex;gap:8px;z-index:3}
.dot{width:9px;height:9px;border:1px solid white;border-radius:50%;background:transparent;padding:0;cursor:pointer}.dot.active{background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 8px var(--cyan)}
.bio-image{width:100%;line-height:0;border-top:1px solid var(--cyan);border-bottom:1px solid var(--cyan);background:#03070c}
.bio-image img{display:block;width:100%;height:auto}
.challenge{max-width:var(--content);margin:0 auto;padding:22px clamp(16px,4vw,42px) 32px}
.challenge h2{text-align:center;font-weight:1000;font-style:italic;font-size:clamp(24px,4.5vw,48px);margin:0 0 20px;text-shadow:2px 2px 0 #30343b}
.challenge h2 span{color:var(--cyan)}
.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(12px,2.6vw,28px)}
.video-card{border:2px solid var(--cyan);border-right-color:var(--magenta);border-bottom-color:var(--magenta);border-radius:14px;overflow:hidden;background:#060d14;box-shadow:0 0 12px #00eaff1f}
.video-frame{position:relative;aspect-ratio:4/3;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;padding:12px;background:radial-gradient(circle at 50% 35%,#12384a,#07121d 55%,#03070c);color:#a8faff;font-size:13px}
.play{display:grid;place-items:center;width:54px;height:54px;border:2px solid white;border-radius:50%;font-size:22px;padding-left:4px;color:white;background:#0008;box-shadow:0 0 12px #00eaff55}
.video-card h3{font-size:clamp(12px,1.8vw,19px);font-style:italic;margin:0;padding:10px 13px 14px;line-height:1.15}.video-card h3 b{color:var(--cyan);font-size:1.3em;margin-right:7px}
.signup-section{max-width:var(--content);margin:0 auto 20px;position:relative;padding:0 4%;line-height:0}
.signup-section>img{width:100%;height:auto;display:block;border:2px solid var(--cyan);border-right-color:var(--magenta);border-bottom-color:var(--magenta);border-radius:16px}
.signup-overlay{position:absolute;right:7%;bottom:12%;display:flex;align-items:center;gap:16px;line-height:1}
.signup-overlay p{font-size:clamp(11px,1.8vw,18px);font-weight:900;font-style:italic;letter-spacing:.08em;text-shadow:0 2px 8px #000;margin:0}
.signup-overlay .neon-button{font-size:clamp(12px,1.6vw,18px);padding:10px 16px}
.site-footer{text-align:center;padding:8px 12px 24px;letter-spacing:.1em;font-weight:800;font-size:clamp(12px,1.7vw,17px)}
.site-footer p{margin:10px 0}.site-footer span{color:var(--magenta);padding:0 10px}.site-footer small{font-size:10px;letter-spacing:.25em;font-style:italic}
@media(max-width:700px){
 .site-header{height:60px;gap:10px}.brand{width:95px;max-width:25vw}.brand-art{height:40px}.tagline{letter-spacing:.12em;font-size:9px;max-width:48%}
 .menu-toggle{display:block;font-size:25px}.main-nav{display:none;position:absolute;top:59px;right:0;left:0;padding:16px 20px;background:#030609;border-bottom:1px solid var(--cyan);flex-direction:column;gap:16px}.main-nav.open{display:flex}
 .hero-slides{aspect-ratio:941/570;max-height:none}.hero-slide img{object-fit:cover;object-position:center top}
 .hero-cta{left:5%;top:auto;bottom:10%;}.hero-cta .neon-button{font-size:clamp(11px,3vw,16px);padding:8px 12px;gap:8px;border-width:2px}
 .hero-dots{bottom:7px;right:10px}.dot{width:7px;height:7px}
 .challenge{padding:18px 14px 24px}.challenge h2{margin-bottom:14px}
 .video-grid{grid-template-columns:1fr;gap:14px;max-width:440px;margin:auto}.video-frame{aspect-ratio:16/8}
 .video-card h3{font-size:16px;padding:9px 12px 11px}
 .signup-section{padding:0 3%;margin-bottom:12px}.signup-overlay{left:8%;right:8%;bottom:6%;justify-content:center;flex-direction:column;gap:8px;text-align:center}
 .signup-overlay p{font-size:12px}.signup-overlay .neon-button{font-size:13px;padding:8px 13px}
 .site-footer{padding-bottom:18px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.hero-slide{transition:none}}