/* ============================================================================
   4dbAI Hotsite — Design System
   Família visual coerente com AZAPPX (dark, circuit blue).
   ========================================================================= */
:root {
  --bg-base:#0a0e1a; --bg-elevated:#0d1424; --bg-card:#111a2e; --bg-card-hover:#142039;
  --border-subtle:rgba(56,189,248,0.10); --border-default:rgba(56,189,248,0.18); --border-strong:rgba(56,189,248,0.32);
  --text-primary:#f8fafc; --text-secondary:#cbd5e1; --text-tertiary:#7c8aa5; --text-faint:#5a6b87;
  --accent:#38bdf8; --accent-bright:#7dd3fc; --accent-deep:#2563eb; --accent-glow:rgba(56,189,248,0.35);
  --gradient-hero: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(37,99,235,0.28), transparent), radial-gradient(ellipse 50% 40% at 80% 100%, rgba(56,189,248,0.10), transparent);
  --gradient-card: linear-gradient(160deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  --s-1:4px; --s-2:8px; --s-3:12px; --s-4:16px; --s-5:24px; --s-6:32px; --s-7:48px; --s-8:64px; --s-9:96px; --s-10:128px;
  --r-sm:8px; --r-md:12px; --r-lg:16px; --r-xl:24px; --r-2xl:32px;
  --shadow-card:0 20px 60px -20px rgba(0,0,0,0.6); --shadow-glow:0 0 40px -10px var(--accent-glow);
  --fs-xs:13px; --fs-sm:14px; --fs-base:16px; --fs-lg:18px; --fs-xl:22px; --fs-2xl:28px; --fs-3xl:36px; --fs-4xl:48px; --fs-5xl:64px; --fs-6xl:80px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --content-max:1200px; --content-narrow:880px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{margin:0;background:var(--bg-base);color:var(--text-secondary);font-family:'Inter',sans-serif;font-size:var(--fs-base);line-height:1.65;font-feature-settings:'cv02','cv03','cv11';-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;}
img,svg{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit;}

body::before{content:'';position:fixed;inset:0;background-image:linear-gradient(rgba(56,189,248,0.025) 1px,transparent 1px),linear-gradient(90deg,rgba(56,189,248,0.025) 1px,transparent 1px);background-size:60px 60px;pointer-events:none;z-index:0;mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);}

h1,h2,h3,h4,h5{font-family:'Sora',sans-serif;font-weight:700;color:var(--text-primary);letter-spacing:-0.025em;line-height:1.15;margin:0;}
h1{font-size:clamp(40px,5.5vw,var(--fs-6xl));font-weight:800;letter-spacing:-0.04em;}
h2{font-size:clamp(32px,4vw,var(--fs-4xl));font-weight:700;letter-spacing:-0.03em;}
h3{font-size:var(--fs-2xl);}
h4{font-size:var(--fs-xl);}
p{margin:0;}
.eyebrow{font-family:'Sora',sans-serif;font-size:var(--fs-xs);font-weight:600;letter-spacing:0.18em;text-transform:uppercase;color:var(--accent);margin-bottom:var(--s-4);}

.container{max-width:var(--content-max);margin:0 auto;padding:0 var(--s-5);position:relative;z-index:1;}
.container-narrow{max-width:var(--content-narrow);margin:0 auto;padding:0 var(--s-5);position:relative;z-index:1;}
section{padding:var(--s-9) 0;position:relative;}
@media (max-width:768px){section{padding:var(--s-8) 0;}}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:var(--s-4) var(--s-5);background:rgba(10,14,26,0.6);backdrop-filter:blur(20px) saturate(150%);-webkit-backdrop-filter:blur(20px) saturate(150%);border-bottom:1px solid var(--border-subtle);transition:background 0.3s var(--ease-out);}
.nav-inner{max-width:var(--content-max);margin:0 auto;display:flex;align-items:center;justify-content:space-between;}
.nav-brand{font-family:'Sora',sans-serif;font-weight:800;font-size:22px;letter-spacing:-0.02em;color:var(--text-primary);}
.nav-brand .ai{color:var(--accent);}
.nav-links{display:flex;gap:var(--s-6);align-items:center;}
.nav-links a{font-size:var(--fs-sm);font-weight:500;color:var(--text-secondary);transition:color 0.2s var(--ease-out);}
.nav-links a:hover{color:var(--text-primary);}
.lang-switch{font-size:11px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;color:var(--text-tertiary);padding:5px 9px;border:1px solid var(--border-subtle);border-radius:6px;transition:all .2s var(--ease-out);}
.lang-switch:hover{color:var(--accent);border-color:var(--border-default);}
.nav-cta{padding:10px 18px;border-radius:var(--r-sm);background:var(--accent);color:var(--bg-base) !important;font-weight:600;font-size:var(--fs-sm);transition:transform 0.2s var(--ease-out),box-shadow 0.2s var(--ease-out);}
.nav-cta:hover{transform:translateY(-1px);box-shadow:var(--shadow-glow);}
.nav-toggle{display:none;}
@media (max-width:768px){
  .nav-links{display:none;}
  .nav-toggle{display:flex;flex-direction:column;gap:5px;padding:8px;}
  .nav-toggle span{width:22px;height:2px;background:var(--text-primary);border-radius:2px;}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--bg-elevated);padding:var(--s-5);border-bottom:1px solid var(--border-default);}
}

.btn{display:inline-flex;align-items:center;gap:var(--s-2);padding:14px 24px;border-radius:var(--r-md);font-family:'Inter',sans-serif;font-weight:600;font-size:var(--fs-sm);letter-spacing:0.01em;transition:all 0.2s var(--ease-out);white-space:nowrap;}
.btn-primary{background:var(--accent);color:var(--bg-base);box-shadow:0 4px 20px -4px var(--accent-glow);}
.btn-primary:hover{background:var(--accent-bright);transform:translateY(-2px);box-shadow:0 8px 30px -4px var(--accent-glow);}
.btn-ghost{background:transparent;color:var(--text-primary);border:1px solid var(--border-default);}
.btn-ghost:hover{background:var(--bg-card);border-color:var(--border-strong);}
.btn .arrow{transition:transform 0.2s var(--ease-out);}
.btn:hover .arrow{transform:translateX(3px);}

.hero{position:relative;padding:180px 0 var(--s-10);overflow:hidden;background:var(--gradient-hero);}
.hero-content{position:relative;z-index:2;text-align:center;max-width:900px;margin:0 auto;}
.hero h1{margin-bottom:var(--s-5);background:linear-gradient(180deg,var(--text-primary) 0%,#a5b4d4 100%);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero h1 .accent{background:linear-gradient(135deg,var(--accent-bright) 0%,var(--accent) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-sub{font-size:clamp(18px,1.8vw,22px);color:var(--text-secondary);max-width:700px;margin:0 auto var(--s-7);line-height:1.55;}
.hero-ctas{display:inline-flex;gap:var(--s-3);flex-wrap:wrap;justify-content:center;}
.hero-circuit-bg{position:absolute;inset:0;opacity:0.4;pointer-events:none;z-index:1;}
.hero-circuit-bg path{stroke:var(--accent);stroke-width:0.8;fill:none;}
.hero-circuit-bg circle.dot,.hero-circuit-bg rect.dot{fill:var(--accent);}
.hero-circuit-bg .pulse{animation:pulse 3s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:.4;}50%{opacity:1;}}

.manifesto{text-align:center;background:radial-gradient(ellipse 50% 70% at 50% 50%,rgba(37,99,235,0.08),transparent),var(--bg-base);}
.manifesto .big-quote{font-family:'Sora',sans-serif;font-size:clamp(30px,4vw,48px);font-weight:700;letter-spacing:-0.025em;line-height:1.25;max-width:900px;margin:0 auto var(--s-5);color:var(--text-primary);}
.manifesto .big-quote em{font-style:normal;background:linear-gradient(135deg,var(--accent-bright) 0%,var(--accent) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;}
.manifesto p{font-size:var(--fs-lg);color:var(--text-secondary);max-width:720px;margin:0 auto;line-height:1.7;}

.section-header{margin-bottom:var(--s-8);max-width:720px;}
.section-header.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-header h2{margin-bottom:var(--s-3);}
.section-header p{color:var(--text-secondary);font-size:var(--fs-lg);}

.capability{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-8);align-items:center;padding:var(--s-7) 0;}
.capability.reverse{direction:rtl;}
.capability.reverse > *{direction:ltr;}
@media (max-width:900px){.capability,.capability.reverse{grid-template-columns:1fr;direction:ltr;gap:var(--s-5);}}
.capability-text .num{font-family:'Sora',sans-serif;font-weight:800;font-size:14px;color:var(--accent);letter-spacing:0.1em;margin-bottom:var(--s-3);}
.capability-text h3{font-size:clamp(24px,2.4vw,32px);margin-bottom:var(--s-4);line-height:1.2;}
.capability-text p{color:var(--text-secondary);font-size:var(--fs-base);line-height:1.7;margin-bottom:var(--s-3);}
.capability-text ul{list-style:none;padding:0;margin:var(--s-4) 0 0;display:flex;flex-direction:column;gap:var(--s-2);}
.capability-text li{display:flex;align-items:flex-start;gap:var(--s-2);font-size:var(--fs-sm);color:var(--text-secondary);}
.capability-text li::before{content:'';width:16px;height:16px;flex-shrink:0;margin-top:4px;background:rgba(56,189,248,0.15);border-radius:4px;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2338bdf8' stroke-width='3'><path d='M5 12l5 5L20 7'/></svg>");background-size:11px;background-position:center;background-repeat:no-repeat;}
.capability-visual{position:relative;background:var(--gradient-card);border:1px solid var(--border-default);border-radius:var(--r-xl);padding:var(--s-6);min-height:240px;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.capability-visual svg{width:100%;max-width:360px;height:auto;}

.compat-section{background:radial-gradient(ellipse 70% 60% at 50% 50%,rgba(37,99,235,0.10),transparent),var(--bg-elevated);border-top:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);}
.compat-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-7);align-items:center;}
@media (max-width:900px){.compat-grid{grid-template-columns:1fr;gap:var(--s-6);}}
.compat-left h2{font-size:clamp(32px,3.8vw,52px);margin-bottom:var(--s-4);}
.compat-left .lead{font-size:var(--fs-lg);color:var(--text-secondary);line-height:1.6;margin-bottom:var(--s-5);}
.compat-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--s-4);margin-top:var(--s-5);}
.stat{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--r-md);padding:var(--s-5);}
.stat-num{font-family:'Sora',sans-serif;font-weight:800;font-size:36px;color:var(--accent);line-height:1;margin-bottom:var(--s-2);letter-spacing:-0.03em;}
.stat-num .plus{font-size:24px;vertical-align:super;}
.stat-label{font-size:var(--fs-xs);color:var(--text-tertiary);font-weight:500;line-height:1.4;}
.coverage{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--r-lg);padding:var(--s-6);}
.coverage h3{font-size:var(--fs-lg);margin-bottom:var(--s-5);color:var(--text-primary);font-family:'Sora',sans-serif;display:flex;align-items:center;gap:var(--s-2);}
.coverage h3 .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);}
.coverage-list{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-2) var(--s-4);list-style:none;padding:0;margin:0;}
@media (max-width:500px){.coverage-list{grid-template-columns:1fr;}}
.coverage-list li{display:flex;align-items:center;gap:var(--s-2);font-size:var(--fs-sm);color:var(--text-secondary);}
.coverage-list li::before{content:'';width:14px;height:14px;flex-shrink:0;background:rgba(56,189,248,0.15);border-radius:4px;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2338bdf8' stroke-width='3'><path d='M5 12l5 5L20 7'/></svg>");background-size:10px;background-position:center;background-repeat:no-repeat;}

.sgbds{display:flex;flex-wrap:wrap;gap:var(--s-2);margin-top:var(--s-5);}
.sgbd{padding:6px 14px;background:rgba(56,189,248,0.06);border:1px solid var(--border-subtle);border-radius:999px;font-size:var(--fs-xs);font-weight:500;color:var(--text-secondary);letter-spacing:0.01em;}

.usecases{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--s-5);}
@media (max-width:800px){.usecases{grid-template-columns:1fr;}}
.usecase{background:var(--gradient-card);border:1px solid var(--border-subtle);border-radius:var(--r-lg);padding:var(--s-6);transition:all .3s var(--ease-out);}
.usecase:hover{border-color:var(--border-default);transform:translateY(-2px);}
.usecase .tag{display:inline-block;font-size:11px;font-weight:600;letter-spacing:0.12em;text-transform:uppercase;color:var(--accent);margin-bottom:var(--s-3);}
.usecase h4{font-size:var(--fs-xl);margin-bottom:var(--s-3);color:var(--text-primary);}
.usecase p{color:var(--text-secondary);font-size:var(--fs-base);line-height:1.65;margin-bottom:var(--s-3);}
.usecase ul{list-style:none;padding:0;margin:var(--s-3) 0 0;display:flex;flex-direction:column;gap:var(--s-2);}
.usecase li{display:flex;align-items:flex-start;gap:var(--s-2);font-size:var(--fs-sm);color:var(--text-secondary);}
.usecase li::before{content:'→';color:var(--accent);flex-shrink:0;font-weight:700;}

.arch-section{background:radial-gradient(ellipse 60% 70% at 50% 50%,rgba(37,99,235,0.10),transparent),var(--bg-elevated);border-top:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);}
.arch-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:var(--s-4);margin-top:var(--s-6);}
.arch-grid .arch-item{grid-column:span 2;}
@media (max-width:800px){
  .arch-grid{grid-template-columns:1fr;}
  .arch-grid .arch-item{grid-column:auto;}
}
/* When there are exactly 5 items, center the last row (4th and 5th) */
.arch-grid .arch-item:nth-child(4):nth-last-child(2){grid-column:2 / span 2;}
.arch-grid .arch-item:nth-child(5):nth-last-child(1){grid-column:4 / span 2;}
@media (max-width:800px){
  .arch-grid .arch-item:nth-child(4):nth-last-child(2),
  .arch-grid .arch-item:nth-child(5):nth-last-child(1){grid-column:auto;}
}
.arch-item{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--r-md);padding:var(--s-5);}
.arch-item .icon{width:36px;height:36px;background:rgba(56,189,248,0.1);border:1px solid var(--border-default);border-radius:8px;display:flex;align-items:center;justify-content:center;margin-bottom:var(--s-3);}
.arch-item .icon svg{width:18px;height:18px;stroke:var(--accent);fill:none;stroke-width:1.8;}
.arch-item h4{font-size:var(--fs-base);font-family:'Sora',sans-serif;font-weight:600;margin-bottom:var(--s-2);color:var(--text-primary);}
.arch-item p{color:var(--text-secondary);font-size:var(--fs-sm);line-height:1.55;}

.evolution{background:var(--bg-base);}
.evo-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--s-7);align-items:center;}
@media (max-width:900px){.evo-grid{grid-template-columns:1fr;}}
.evo-list{display:flex;flex-direction:column;gap:var(--s-3);list-style:none;padding:0;margin:0;}
.evo-list li{background:var(--gradient-card);border:1px solid var(--border-subtle);border-radius:var(--r-md);padding:var(--s-4);font-size:var(--fs-base);color:var(--text-secondary);display:flex;align-items:center;gap:var(--s-3);}
.evo-list .dash{width:24px;height:1px;background:var(--accent);flex-shrink:0;}

.final-cta{text-align:center;padding:var(--s-10) 0;background:radial-gradient(ellipse 60% 80% at 50% 50%,rgba(56,189,248,0.10),transparent),var(--bg-base);border-top:1px solid var(--border-subtle);}
.final-cta h2{max-width:800px;margin:0 auto var(--s-4);}
.final-cta p{color:var(--text-secondary);font-size:var(--fs-lg);max-width:600px;margin:0 auto var(--s-6);}

.footer{padding:var(--s-7) 0 var(--s-5);border-top:1px solid var(--border-subtle);background:var(--bg-base);}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:var(--s-6);margin-bottom:var(--s-6);}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr;}}
.footer-col h4{font-size:var(--fs-xs);font-weight:600;letter-spacing:0.12em;text-transform:uppercase;color:var(--text-tertiary);margin-bottom:var(--s-4);font-family:'Sora',sans-serif;}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--s-2);}
.footer-col a{color:var(--text-secondary);font-size:var(--fs-sm);transition:color 0.2s;}
.footer-col a:hover{color:var(--text-primary);}
.footer-brand{font-family:'Sora',sans-serif;font-weight:800;font-size:24px;color:var(--text-primary);margin-bottom:var(--s-3);display:block;}
.footer-brand .ai{color:var(--accent);}
.footer-tagline{color:var(--text-tertiary);font-size:var(--fs-sm);max-width:360px;line-height:1.6;margin-bottom:var(--s-3);}
.footer-byline{font-size:var(--fs-xs);color:var(--text-faint);}
.footer-byline a{color:var(--text-tertiary);}
.footer-byline a:hover{color:var(--accent);}
.footer-bottom{padding-top:var(--s-4);border-top:1px solid var(--border-subtle);display:flex;justify-content:space-between;flex-wrap:wrap;gap:var(--s-3);font-size:var(--fs-xs);color:var(--text-faint);}

.js-loaded .reveal{opacity:0;transform:translateY(20px);transition:opacity 0.8s var(--ease-out),transform 0.8s var(--ease-out);}
.js-loaded .reveal.visible{opacity:1;transform:translateY(0);}

/* Contextual section-link: discrete inline CTA at end of home sections */
.section-link{display:flex;justify-content:center;margin-top:var(--s-7);}
.section-link a{display:inline-flex;align-items:center;gap:var(--s-2);padding:10px 20px;font-family:'Inter',sans-serif;font-size:var(--fs-sm);font-weight:500;color:var(--accent);border:1px solid var(--border-default);border-radius:var(--r-md);background:rgba(56,189,248,0.04);transition:all 0.2s var(--ease-out);}
.section-link a:hover{background:rgba(56,189,248,0.10);border-color:var(--border-strong);color:var(--accent-bright);transform:translateY(-1px);}
.section-link a svg{transition:transform 0.2s var(--ease-out);}
.section-link a:hover svg{transform:translateX(3px);}

::selection{background:var(--accent);color:var(--bg-base);}