/* TUSTOCK landing - base, navegacion, hero y seccion del sistema.
   Direccion: DESIGN.md (paleta Stitch). Azul = unico acento interactivo;
   naranja solo como marcador del plan recomendado. Jerarquia por capa tonal. */

:root{
  color-scheme:dark;
  --bg:#10131a;
  --surface-lowest:#0b0e15;
  --surface-low:#191b23;
  --surface:#1d2027;
  --surface-high:#272a31;
  --surface-highest:#32353c;
  --on-surface:#e0e2ec;
  --on-surface-variant:#c2c6d6;
  --outline:#8c909f;
  --outline-variant:#424753;
  --primary:#adc6ff;
  --primary-container:#4d8eff;
  --primary-hover:#3d7df0;
  --on-primary-container:#00285d;
  --tertiary:#ffb786;
  --success:#50d890;
  --danger:#ffb4ab;
  --font-body:'Inter',system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-data:'Geist Mono',"SF Mono",Consolas,monospace;
  --container:1160px;
  --gutter:24px;
  --radius-sm:4px;
  --radius:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:24px;
  --transition:.15s ease;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:84px}
body{font-family:var(--font-body);font-size:16px;line-height:1.55;color:var(--on-surface);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
ul{list-style:none}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:2px}

.container{max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}
.section{padding:76px 0}
.section-head{max-width:62ch;margin-bottom:34px}
.section-title{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:-.02em;line-height:1.15}
.section-lead{margin-top:12px;color:var(--on-surface-variant);font-size:16px}
.label{font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--outline)}
.num{font-family:var(--font-data);font-variant-numeric:tabular-nums}
.icon{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.icon-fill{fill:currentColor;stroke:none}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:16px;top:-48px;z-index:60;background:var(--primary-container);color:var(--on-primary-container);padding:10px 16px;border-radius:var(--radius);font-weight:600;transition:top var(--transition)}
.skip:focus{top:12px}

/* Botones: primario relleno azul, secundario outline, foco visible siempre. */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:12px 22px;border-radius:var(--radius);font-size:15px;font-weight:600;line-height:1;transition:background var(--transition),border-color var(--transition),color var(--transition),transform var(--transition);text-align:center}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--primary-container);color:var(--on-primary-container)}
.btn-primary:hover{background:var(--primary-hover)}
.btn-outline{border:1px solid var(--outline-variant);color:var(--on-surface)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{min-height:44px;padding:9px 16px;font-size:14px}
.btn .icon{width:18px;height:18px}

/* Navegacion: unica superficie con glass (dose cap). */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;background:rgba(16,19,26,.82);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--outline-variant)}
.nav-inner{max-width:var(--container);margin:0 auto;padding:0 var(--gutter);height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.nav-logo{font-size:19px;font-weight:800;letter-spacing:.01em}
.nav-logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:14px;font-weight:500;color:var(--on-surface-variant);transition:color var(--transition)}
.nav-links a:hover{color:var(--primary)}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-menu-btn{display:none;width:44px;height:44px;align-items:center;justify-content:center;color:var(--on-surface)}
.nav-menu-btn .icon{width:24px;height:24px}
.theme-toggle{display:inline-flex;width:44px;height:44px;align-items:center;justify-content:center;border:1px solid var(--outline-variant);border-radius:var(--radius);color:var(--on-surface-variant);transition:color var(--transition),border-color var(--transition)}
.theme-toggle:hover{color:var(--primary);border-color:var(--primary)}
.theme-toggle .icon{width:20px;height:20px}
.theme-toggle .t-sun{display:none}
.theme-toggle .t-moon{display:inline-flex}
html[data-theme="dark"] .theme-toggle .t-sun{display:inline-flex}
html[data-theme="dark"] .theme-toggle .t-moon{display:none}
.theme-toggle-mobile{width:100%;height:auto;min-height:44px;justify-content:flex-start;gap:10px;border:0;border-top:1px solid var(--outline-variant);border-radius:0;padding:13px 0}
.theme-toggle-text{font-size:16px;font-weight:500}
.nav-mobile{display:none}
.nav-mobile.open{display:block;position:fixed;top:64px;left:0;right:0;z-index:49;background:var(--surface-lowest);border-bottom:1px solid var(--outline-variant);padding:4px var(--gutter) 14px}
.nav-mobile a{display:block;padding:13px 0;font-size:16px;font-weight:500;color:var(--on-surface-variant);border-bottom:1px solid var(--outline-variant)}
.nav-mobile a:last-child{border-bottom:0}

/* Hero: composicion asimetrica (texto + dato). */
.hero{padding:132px 0 68px;border-bottom:1px solid var(--outline-variant)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:48px;align-items:start}
.hero h1{font-size:clamp(30px,4.6vw,52px);font-weight:800;line-height:1.07;letter-spacing:-.03em;max-width:15ch}
.hero-sub{margin-top:20px;max-width:55ch;font-size:clamp(16px,1.4vw,18px);color:var(--on-surface-variant)}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-note{margin-top:18px;font-size:14px;color:var(--outline);max-width:50ch}
.hero-panel{background:var(--surface-low);border:1px solid var(--outline-variant);border-radius:var(--radius-lg);padding:24px}
.hero-panel .label{display:block;margin-bottom:10px}
.hero-num{font-family:var(--font-data);font-size:clamp(34px,5vw,46px);font-weight:800;letter-spacing:-.02em;line-height:1}
.hero-panel-sub{margin-top:12px;font-size:14px;color:var(--on-surface-variant)}
.hero-divider{height:1px;background:var(--outline-variant);margin:18px 0}
.hero-fact{display:flex;justify-content:space-between;gap:12px;font-size:14px;color:var(--on-surface-variant);padding:5px 0}
.hero-fact .num{color:var(--on-surface);font-weight:700}

/* Visual del producto: captura real si existe, si no ilustracion rotulada. */
.shot{margin:0}
.shot-media{position:relative;border:1px solid var(--outline-variant);border-radius:var(--radius-lg);overflow:hidden;background:var(--surface-lowest);aspect-ratio:16/10}
.shot-img{position:absolute;inset:0;z-index:2;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .3s ease}
.shot-img.is-loaded{opacity:1}
.shot figcaption{margin-top:12px;font-size:13px;color:var(--outline)}
.illo{position:absolute;inset:0;z-index:1;display:flex;flex-direction:column}
.illo-bar{display:flex;align-items:center;gap:6px;padding:11px 16px;border-bottom:1px solid var(--outline-variant)}
.illo-dot{width:9px;height:9px;border-radius:50%;background:var(--outline-variant)}
.illo-bar span{margin-left:10px;font-size:11px;color:var(--outline);font-family:var(--font-data)}
.illo-body{flex:1;padding:16px;display:grid;grid-template-columns:1.1fr 1fr;gap:14px;min-height:0}
.illo-focus{background:var(--surface);border:1px solid var(--outline-variant);border-radius:var(--radius-md);padding:18px;display:flex;flex-direction:column;justify-content:center}
.illo-focus .label{display:block;margin-bottom:12px}
.illo-value{width:72%;height:32px;border-radius:6px;background:linear-gradient(90deg,var(--surface-high),var(--surface-highest))}
.illo-focus p{margin-top:14px;font-size:12px;color:var(--outline)}
.illo-col{display:flex;flex-direction:column;gap:12px}
.illo-card{flex:1;background:var(--surface);border:1px solid var(--outline-variant);border-radius:var(--radius-md);padding:14px}
.illo-line{height:8px;border-radius:4px;background:var(--surface-highest);margin-bottom:9px}
.illo-line.w80{width:80%}.illo-line.w60{width:60%}.illo-line.w40{width:40%}
.illo-bars{display:flex;align-items:flex-end;gap:7px;height:100%;min-height:52px}
.illo-bars i{flex:1;background:var(--outline-variant);border-radius:3px 3px 0 0}
.spec-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:36px}
.spec{padding-top:16px;border-top:2px solid var(--outline-variant)}
.spec h3{font-size:15px;font-weight:600;margin-bottom:6px}
.spec p{font-size:14px;color:var(--on-surface-variant)}

/* Motion: reveal agrupado por bloque. Solo con JS, nunca obligatorio. */
.motion .reveal{opacity:0;transform:translateY(18px);transition:opacity .45s ease,transform .45s ease}
.motion .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .motion .reveal{opacity:1;transform:none;transition:none}
  .shot-img{transition:none}
}
.lite .reveal{opacity:1!important;transform:none!important;transition:none!important}
.lite .shot-img{transition:none}
.lite .nav{backdrop-filter:none;-webkit-backdrop-filter:none;background:var(--bg)}