/* =============================================================================
   TeslaBrainstorm — dizajn sistem
   Tema: „elektro-mreža uma” — Tesla (struja) + mozak (neuroni) + mape uma (čvorovi).
   Tamne „strujne” sekcije + svetle čitljive sekcije za dug tekst.
   ========================================================================== */

/* ---- Fontovi (self-hosted, latin + latin-ext za srpsku latinicu) --------- */
@font-face{
  font-family:'Sora';font-style:normal;font-weight:400 800;font-display:swap;
  src:url('/assets/fonts/sora-latin-ext.woff2') format('woff2');
  unicode-range:U+0100-024F,U+0259,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face{
  font-family:'Sora';font-style:normal;font-weight:400 800;font-display:swap;
  src:url('/assets/fonts/sora-latin.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face{
  font-family:'Inter';font-style:normal;font-weight:400 700;font-display:swap;
  src:url('/assets/fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range:U+0100-024F,U+0259,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face{
  font-family:'Inter';font-style:normal;font-weight:400 700;font-display:swap;
  src:url('/assets/fonts/inter-latin.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

/* ---- Tokeni -------------------------------------------------------------- */
:root{
  --ink:#08131f; --navy-900:#0a2237; --navy-800:#0d3a5c; --navy-700:#114a72;
  --current:#1a9fe0; --current-bright:#34c6ff; --current-deep:#0f7ec2;
  --glow:rgba(52,198,255,.30);
  --paper:#f5f9fc; --paper-2:#e9f1f8;
  --text:#0f2233; --text-soft:#4b6072;
  --invert:#eef6fc; --invert-soft:#9fbdd2;
  --line-d:#dbe8f2; --line-i:rgba(255,255,255,.12);

  --font-display:'Sora',ui-sans-serif,system-ui,'Segoe UI',Roboto,sans-serif;
  --font-body:'Inter',ui-sans-serif,system-ui,'Segoe UI',Roboto,Arial,sans-serif;

  --wrap:1140px; --gap:clamp(1rem,3vw,2rem);
  --radius:16px; --radius-lg:24px;
  --shadow:0 12px 40px -12px rgba(8,19,31,.18);
  --shadow-cyan:0 16px 50px -16px var(--glow);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---- Reset / baza -------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body);color:var(--text);background:var(--paper);
  line-height:1.65;font-size:clamp(1rem,.96rem + .2vw,1.075rem);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--current-deep);text-decoration:none}
a:hover{color:var(--current)}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.1;font-weight:700;letter-spacing:-.02em;color:var(--navy-800)}
h1{font-size:clamp(2.2rem,1.5rem + 3.4vw,4rem);font-weight:800}
h2{font-size:clamp(1.7rem,1.25rem + 2vw,2.7rem)}
h3{font-size:clamp(1.2rem,1.05rem + .7vw,1.5rem)}
p{margin:0 0 1rem}
strong{font-weight:700;color:var(--navy-800)}
:focus-visible{outline:3px solid var(--current);outline-offset:3px;border-radius:4px}
::selection{background:var(--current);color:#fff}

/* ---- Layout -------------------------------------------------------------- */
.wrap{width:min(100% - 2.4rem,var(--wrap));margin-inline:auto}
.section{padding:clamp(3.5rem,2rem + 7vw,7rem) 0}
.section--tight{padding:clamp(2.5rem,1.5rem + 4vw,4rem) 0}
.section--dark{background:var(--ink);color:var(--invert);position:relative}
.section--dark h1,.section--dark h2,.section--dark h3{color:#fff}
.section--navy{background:linear-gradient(160deg,var(--navy-800),var(--navy-900) 70%,var(--ink));color:var(--invert)}
.section--navy h2,.section--navy h3{color:#fff}
.section--paper2{background:var(--paper-2)}
.eyebrow{font-family:var(--font-display);font-weight:600;font-size:.82rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--current-deep);display:inline-flex;align-items:center;gap:.6rem;margin-bottom:1rem}
.eyebrow::before{content:"";width:26px;height:2px;background:linear-gradient(90deg,var(--current),transparent)}
.section--dark .eyebrow,.section--navy .eyebrow{color:var(--current-bright)}
.lead{font-size:clamp(1.1rem,1rem + .5vw,1.3rem);color:var(--text-soft);max-width:60ch}
.section--dark .lead,.section--navy .lead{color:var(--invert-soft)}
.center{text-align:center}.center .lead,.center .eyebrow{margin-inline:auto}
.center .eyebrow{justify-content:center}

/* ---- Dugmad -------------------------------------------------------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  font-family:var(--font-display);font-weight:600;font-size:1rem;line-height:1;
  padding:.95rem 1.7rem;border-radius:999px;border:1px solid transparent;cursor:pointer;
  transition:transform .2s var(--ease),box-shadow .25s var(--ease),background .2s,color .2s}
.btn:active{transform:translateY(1px)}
.btn--primary{background:linear-gradient(135deg,var(--current-bright),var(--current-deep));color:#fff;
  box-shadow:0 10px 30px -10px var(--glow)}
.btn--primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 18px 44px -12px var(--glow)}
.btn--ghost{background:transparent;color:var(--navy-800);border-color:var(--line-d)}
.btn--ghost:hover{border-color:var(--current);color:var(--current-deep)}
.section--dark .btn--ghost,.section--navy .btn--ghost,.hero .btn--ghost{color:#fff;border-color:rgba(255,255,255,.28)}
.section--dark .btn--ghost:hover,.hero .btn--ghost:hover{border-color:var(--current-bright);background:rgba(255,255,255,.06)}
.btn--lg{padding:1.1rem 2.1rem;font-size:1.08rem}
.btn-row{display:flex;flex-wrap:wrap;gap:.9rem}

/* ---- Header -------------------------------------------------------------- */
.site-header{position:sticky;top:0;z-index:50;transition:background .3s,box-shadow .3s;
  background:rgba(8,19,31,.82);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-i)}
.site-header.scrolled{background:rgba(8,19,31,.95);box-shadow:0 10px 30px -14px rgba(0,0,0,.55)}
.nav{display:flex;align-items:center;gap:1.4rem;padding:.85rem 0}
.brand{display:flex;align-items:center;gap:.65rem;margin-right:auto;color:#fff}
.brand:hover{color:#fff}
.brand img{width:80px;height:auto;filter:drop-shadow(0 2px 8px var(--glow))}
.brand b{font-family:var(--font-display);font-weight:800;font-size:1.05rem;letter-spacing:-.01em;line-height:1;color:#fff}
.brand span{display:block;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--invert-soft);font-weight:500}
.nav-links{display:flex;align-items:center;gap:.3rem;list-style:none}
.nav-links a{color:var(--invert-soft);font-weight:500;font-size:.95rem;padding:.5rem .8rem;border-radius:8px;transition:color .2s,background .2s}
.nav-links a:hover,.nav-links a[aria-current]{color:#fff;background:rgba(255,255,255,.07)}
.nav-cta{display:flex;align-items:center;gap:.5rem}
.site-header .btn--ghost{color:#fff;border-color:rgba(255,255,255,.28)}
.site-header .btn--ghost:hover{color:#fff;border-color:var(--current-bright);background:rgba(255,255,255,.06)}
.nav-toggle{display:none;background:none;border:0;color:#fff;padding:.4rem;cursor:pointer}
.nav-toggle svg{width:28px;height:28px}

/* ---- Hero ---------------------------------------------------------------- */
.hero{position:relative;background:radial-gradient(120% 90% at 78% 8%,#123a5b 0%,var(--navy-900) 42%,var(--ink) 100%);
  color:var(--invert);overflow:hidden;isolation:isolate}
.hero__canvas{position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.9}
.hero__inner{display:grid;grid-template-columns:1.05fr .95fr;gap:2rem;align-items:center;
  padding:clamp(3rem,2rem + 6vw,6.5rem) 0 clamp(3.5rem,2rem + 6vw,6rem)}
.hero h1{color:#fff;max-width:14ch}
.hero h1 .grad{background:linear-gradient(120deg,var(--current-bright),#7fe0ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin:1.3rem 0 2rem;color:#cfe4f3;max-width:46ch}
.hero__badges{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:2.2rem}
.chip{display:inline-flex;align-items:center;gap:.45rem;font-size:.82rem;font-weight:500;
  padding:.42rem .85rem;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid var(--line-i);color:var(--invert)}
.chip svg{width:15px;height:15px;color:var(--current-bright)}
.hero__art{position:relative;justify-self:center}
.hero__art img{width:min(100%,420px);filter:drop-shadow(0 20px 60px rgba(0,0,0,.5))}
.hero__glow{position:absolute;inset:-10% -10% auto auto;width:70%;aspect-ratio:1;
  background:radial-gradient(circle,var(--glow),transparent 66%);z-index:-1;filter:blur(10px)}

/* pulsirajuća „struja” u naslovu */
.spark{color:var(--current-bright)}

/* ---- Stat traka ---------------------------------------------------------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-i);
  border:1px solid var(--line-i);border-radius:var(--radius);overflow:hidden}
.stat{background:var(--ink);padding:1.5rem 1.2rem;text-align:center}
.section--navy .stat{background:rgba(255,255,255,.02)}
.stat b{display:block;font-family:var(--font-display);font-weight:800;font-size:clamp(1.6rem,1.2rem + 1.6vw,2.3rem);color:#fff}
.stat span{font-size:.85rem;color:var(--invert-soft)}
.stat b .u{color:var(--current-bright)}

/* ---- Moduli (čvorovi mape uma) ------------------------------------------- */
.modules{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(1rem,2vw,1.6rem)}
.module{position:relative;background:#fff;border:1px solid var(--line-d);border-radius:var(--radius-lg);
  padding:2rem 1.9rem;transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s;overflow:hidden}
.module::before{content:"";position:absolute;left:0;top:0;height:100%;width:4px;
  background:linear-gradient(var(--current-bright),var(--current-deep));transform:scaleY(0);transform-origin:top;transition:transform .35s var(--ease)}
.module:hover{transform:translateY(-6px);box-shadow:var(--shadow-cyan);border-color:transparent}
.module:hover::before{transform:scaleY(1)}
.module__node{display:flex;align-items:center;gap:1rem;margin-bottom:1.1rem}
.module__num{flex:0 0 auto;width:54px;height:54px;border-radius:14px;display:grid;place-items:center;
  font-family:var(--font-display);font-weight:800;font-size:1.25rem;color:var(--current-deep);
  background:radial-gradient(circle at 30% 30%,#eaf6ff,#d3ebfb);border:1px solid #cbe6fa}
.module:hover .module__num{color:#fff;background:linear-gradient(135deg,var(--current-bright),var(--current-deep));border-color:transparent}
.module h3{margin:0}
.module__tag{color:var(--text-soft);font-size:.95rem;margin:.1rem 0 1.1rem}
.module ul{list-style:none;display:grid;gap:.55rem}
.module li{position:relative;padding-left:1.6rem;font-size:.95rem;color:var(--text)}
.module li::before{content:"";position:absolute;left:0;top:.55em;width:8px;height:8px;border-radius:50%;
  background:var(--current);box-shadow:0 0 0 3px rgba(26,159,224,.15)}

/* ---- Feature/split ------------------------------------------------------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,4rem);align-items:center}
.split--rev .split__media{order:2}
.split__media img{border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.bojan-card{position:relative;display:inline-block}
.bojan-card img{border-radius:var(--radius-lg);width:min(100%,340px)}
.bojan-card::after{content:"";position:absolute;inset:auto -14px -14px auto;width:66%;height:66%;
  border:2px solid var(--current);border-radius:var(--radius-lg);z-index:-1}

.checklist{list-style:none;display:grid;gap:.8rem;margin:1.2rem 0}
.checklist li{position:relative;padding-left:2rem;color:var(--text)}
.section--dark .checklist li,.section--navy .checklist li{color:var(--invert)}
.checklist li::before{content:"";position:absolute;left:0;top:.15em;width:22px;height:22px;border-radius:50%;
  background:var(--current);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center/16px no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center/16px no-repeat}

/* ---- Cena / CTA kartica -------------------------------------------------- */
.price-card{background:#fff;border-radius:var(--radius-lg);border:1px solid var(--line-d);
  box-shadow:var(--shadow);padding:clamp(1.8rem,1rem + 3vw,3rem);text-align:center;max-width:520px;margin-inline:auto}
.price-card .price{font-family:var(--font-display);font-weight:800;font-size:clamp(3rem,2rem + 4vw,4.5rem);
  color:var(--navy-800);line-height:1;display:flex;align-items:baseline;justify-content:center;gap:.3rem}
.price-card .price small{font-size:.32em;font-weight:600;color:var(--text-soft)}
.price-card .note{color:var(--text-soft);font-size:.92rem}
.price-card .checklist{text-align:left;max-width:300px;margin-inline:auto}
/* Kartica je uvek bela — tekst tamni čak i unutar tamne sekcije. */
.price-card,.section--dark .price-card .checklist li,.section--navy .price-card .checklist li{color:var(--text)}

/* ---- Forme --------------------------------------------------------------- */
.field{margin-bottom:1.1rem}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.4rem;color:var(--navy-800)}
.field input,.field textarea,.field select{width:100%;font:inherit;color:var(--text);background:#fff;
  border:1px solid var(--line-d);border-radius:12px;padding:.85rem 1rem;transition:border-color .2s,box-shadow .2s}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--current);box-shadow:0 0 0 4px rgba(26,159,224,.14)}
.form-card{background:#fff;border:1px solid var(--line-d);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);padding:clamp(1.6rem,1rem + 2.5vw,2.6rem)}
.form-narrow{max-width:460px;margin-inline:auto}

/* ---- Alert / flash ------------------------------------------------------- */
.alert{padding:.9rem 1.1rem;border-radius:12px;margin-bottom:1rem;font-size:.95rem;border:1px solid}
.alert--success{background:#e8f7ee;border-color:#b7e6c8;color:#12683a}
.alert--error{background:#fdecec;border-color:#f4c6c6;color:#a12525}
.alert--info{background:#e9f2fb;border-color:#c3ddf3;color:#164e7e}

/* ---- Zaglavlje podstranice ----------------------------------------------- */
.page-head{background:radial-gradient(120% 140% at 80% -10%,#123a5b,var(--navy-900) 55%,var(--ink));
  color:var(--invert);padding:clamp(2.5rem,2rem + 4vw,4.5rem) 0 clamp(2rem,1.5rem + 3vw,3.5rem)}
.page-head h1{color:#fff;margin:.3rem 0 .6rem}
.page-head .lead{color:var(--invert-soft)}
.crumbs{display:flex;flex-wrap:wrap;gap:.4rem;font-size:.82rem;color:var(--invert-soft);margin-bottom:.4rem;list-style:none}
.crumbs a{color:var(--invert-soft)}.crumbs a:hover{color:var(--current-bright)}
.crumbs li::after{content:"/";margin-left:.4rem;opacity:.5}
.crumbs li:last-child::after{content:""}

/* ---- Proza (pravne strane, blog) ---------------------------------------- */
.prose{max-width:74ch}
.prose h2{margin:2.4rem 0 1rem}.prose h3{margin:1.8rem 0 .8rem;color:var(--navy-700)}
.prose ul,.prose ol{margin:0 0 1.2rem 1.3rem;display:grid;gap:.4rem}
.prose a{text-decoration:underline}

/* ---- Footer -------------------------------------------------------------- */
.site-footer{background:var(--ink);color:var(--invert-soft);padding:clamp(3rem,2rem + 3vw,4.5rem) 0 2rem;border-top:1px solid var(--line-i)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:2rem}
.site-footer h4{color:#fff;font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;margin-bottom:1rem;font-family:var(--font-display)}
.site-footer ul{list-style:none;display:grid;gap:.5rem}
.site-footer a{color:var(--invert-soft)}.site-footer a:hover{color:var(--current-bright)}
.footer-brand p{max-width:36ch;font-size:.92rem;margin-top:1rem}
.footer-social{display:flex;gap:.7rem;margin-top:1.2rem}
.footer-social a{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:rgba(255,255,255,.06);border:1px solid var(--line-i)}
.footer-social a:hover{background:var(--current-deep);color:#fff}
.footer-social svg{width:20px;height:20px}
.footer-bottom{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--line-i);
  display:flex;flex-wrap:wrap;gap:.6rem 1.4rem;justify-content:space-between;font-size:.85rem}
.footer-bottom a{color:var(--invert)}

/* ---- Reveal animacija (samo kad ima JS-a; bez JS-a sadržaj je vidljiv) ---- */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .reveal.in{opacity:1;transform:none}

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width:900px){
  .hero__inner,.split,.split--rev .split__media{grid-template-columns:1fr;order:0}
  .hero__art{grid-row:1;max-width:300px}
  .modules,.footer-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav-links,.nav-cta .btn--ghost{display:none}
  .nav-toggle{display:block}
  .site-header.nav-open{background:var(--ink)}
  .nav-open .nav-links{display:flex;position:absolute;inset:100% 0 auto;flex-direction:column;
    background:var(--ink);padding:1rem 1.2rem 1.6rem;gap:.2rem;border-bottom:1px solid var(--line-i)}
  .nav-open .nav-links a{padding:.8rem 1rem}
}
@media (max-width:560px){ .stats{grid-template-columns:1fr 1fr} .btn{width:100%} .btn-row .btn{flex:1 1 auto} }

/* ---- Reduced motion ------------------------------------------------------ */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}