/* ==========================================================================
   1. Globalni Stilovi & Boje
   ========================================================================== */
:root {
    --deep-charcoal: #2F2F2F; /* Primarna siva iz image_7.png */
    --sovereign-blue: #0055AA; /* Primarna plava iz image_7.png */
    --pure-white: #FFFFFF;
    --light-grey: #F5F7FA; /* Suptilna pozadina za sekcije */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px; /* Baza za em/rem */
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', sans-serif;
    color: var(--deep-charcoal);
    line-height: 1.6;
    background-color: var(--pure-white);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3, h4 {
    color: var(--deep-charcoal);
    font-weight: 600; /* Semi-Bold za QUANT delove */
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

h1 { font-size: 1.8rem; margin-bottom: 1.5rem; text-align: center; }
h2 { font-size: 1.1rem; font-weight: 400; text-align: center; max-width: 800px; margin: 0 auto 2.5rem; }
h3 { font-size: 1.4rem; margin-bottom: 2rem; text-align: center; }
h4 { font-size: 1.1rem; margin-bottom: 1rem; }

p { font-weight: 400; margin-bottom: 1rem; } /* Regular za ARS delove */

a { text-decoration: none; color: inherit; transition: all 0.3s ease; }

/* ==========================================================================
   2. Elementi (Dugmad & Logo kontrola)
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--sovereign-blue);
    color: var(--pure-white);
    font-weight: 600;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    border-radius: 0; /* Strog oblik */
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn:hover {
    background-color: #004488;
    transform: translateY(-2px);
}

/* Logo Stilizacija - Čista kontrola SVG visine */
.logo {
    display: inline-flex;
    align-items: center;
    padding: 10px 0; /* Vertikalni sigurni prostor */
}

.logo-image {
    height: 60px; /* Glavna visina na desktopu */
    width: auto;  /* Prilagođava širinu automatski */
    display: block;  /* Uklanja prazan prostor ispod slike */
    max-width: 100%; /* Responzivnost */
    image-rendering: -webkit-optimize-contrast; /* Skaliranje na Retina ekranima */
}

/* ==========================================================================
   3. Header (Zaglavlje)
   ========================================================================== */
.main-header {
    background-color: var(--pure-white);
    padding: 0; /* Visina kontrolisana paddingom logotipa */
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-header { font-size: 0.8rem; padding: 0.5rem 1.5rem; }

/* Mobilni Meni hamburger (skriven na desktopu) */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}
.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--deep-charcoal);
}

/* ==========================================================================
   4. Hero Section
   ========================================================================== */
.hero {
    background-color: var(--pure-white);
    padding: 10rem 0 6rem; /* Padding za "iznad preloma" efekt */
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.cta-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.btn-hero { font-size: 1.1rem; padding: 1rem 3rem; }

/* placeholder za beli checkmark iz logotipa */
.cta-check {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.2rem;
    height: 1.2rem;
    background-image: url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M21 7L9 19l-5.5-5.5 1.41-1.41L9 16.17 19.59 5.59 21 7z"/></svg>');
    background-size: cover;
}

/* ==========================================================================
   5. Value Proposition (ARS vs QUANT Fuzija)
   ========================================================================== */
.value-proposition {
    background-color: var(--light-grey);
    padding: 6rem 0;
}
.value-proposition h3 {
    letter-spacing: 0.12em; 
    margin-bottom: 3.5rem;
    font-weight: 600;
    color: var(--deep-charcoal);
}

/* Grid za 2 kolone */
.fused-approach-wrapper {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    align-items: stretch;
}

.ars-skill, .quant-logic {
    background-color: var(--pure-white);
    padding: 3rem;
    border: 1px solid rgba(0,0,0,0.05);
}

.quant-logic h4 { color: var(--sovereign-blue); }

/* ==========================================================================
   6. Target Market (3 kolone responzivno)
   ========================================================================== */
.target-market {
    padding: 6rem 0;
}

/* Grid za 3 kolone */
.market-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.market-card {
    background-color: var(--pure-white);
    padding: 3rem;
    border: 1px solid rgba(0,0,0,0.05);
    text-align: center;
}

/* placeholder za ikone (koje će biti SVG) */
.icon {
    width: 60px;
    height: 60px;
    background-color: rgba(0, 85, 170, 0.7); /* Sovereign Blue sa opacity */
    margin: 0 auto 1.5rem;
    border-radius: 50%;
}
.stake-section {
    padding: 6rem 0;
    background-color: var(--pure-white);
}

.section-title {
    font-size: 1.8rem;
    letter-spacing: 0.1em;
    text-align: center;
    margin-bottom: 4rem;
    color: var(--deep-charcoal);
}

.stake-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 2x2 grid za desktop */
    gap: 2.5rem;
}

.stake-card {
    padding: 2.5rem;
    border-left: 3px solid var(--sovereign-blue); /* Diskretna linija koja daje ton */
    background: #f9f9f9; /* Veoma svetla siva za kontrast */
    transition: transform 0.3s ease;
}

.stake-card:hover {
    transform: translateY(-5px);
}

.stake-label {
    display: block;
    font-family: 'Inter', sans-serif; /* Ili tvoj sistemski font */
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.2em;
    color: var(--sovereign-blue);
    margin-bottom: 1.5rem;
}

.stake-card h5 {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 1rem;
    color: var(--deep-charcoal);
}

.stake-card p {
    font-size: 1rem;
    line-height: 1.6;
    color: #555;
}

/* Responzivnost */
@media (max-width: 768px) {
    .stake-grid {
        grid-template-columns: 1fr;
    }
}
/* ==========================================================================
   7. About the Architect
   ========================================================================== */
.about-architect {
    background-color: var(--light-grey);
    padding: 6rem 0;
}

.architect-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 50px;
}

.architect-photo {
    flex: 1;
    max-width: 400px;
}

/*placeholder za portret */
.photo-placeholder {
    width: 100%;
    height: auto;
    object-fit: cover;
    border: 1px solid rgba(0,0,0,0.1);
}

.architect-text {
    flex: 1.5;
}

.architect-subtitle { font-weight: 600; text-transform: uppercase; margin-bottom: 2rem; color: var(--sovereign-blue); }

/* --- THE PRINCIPAL SECTION --- */
.principal-section {
    padding: 10rem 0; /* Ekstremni whitespace za utisak važnosti */
    background-color: var(--pure-white);
    border-bottom: 1px solid #eee;
}

.principal-wrapper {
    max-width: 900px; /* Užeg opsega radi lakšeg čitanja i fokusa */
    margin: 0 auto;
}

/* Oznaka iznad naslova (Industrial Label style) */
.label {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.3em;
    color: var(--sovereign-blue);
    margin-bottom: 3rem;
    position: relative;
}

/* Mala linija pored label-a za inženjerski šmek */
.label::before {
    content: "";
    display: inline-block;
    width: 30px;
    height: 2px;
    background-color: var(--sovereign-blue);
    vertical-align: middle;
    margin-right: 15px;
}

.principal-content h2 {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.1;
    color: var(--deep-charcoal);
    margin-bottom: 2.5rem;
    letter-spacing: -0.02em;
}

.principal-content p {
    font-size: 1.25rem;
    line-height: 1.7;
    color: #444;
    margin-bottom: 2rem;
    max-width: 800px;
}

/* Isticanje ključnog dela teksta u drugom pasusu */
.principal-content p:last-child {
    font-weight: 500;
    color: var(--deep-charcoal);
    border-left: 2px solid #eee;
    padding-left: 2rem;
    margin-top: 3rem;
}

/* Responzivnost za mobilne uređaje */
@media (max-width: 768px) {
    .principal-section {
        padding: 6rem 0;
    }
    
    .principal-content h2 {
        font-size: 2rem;
    }
    
    .principal-content p {
        font-size: 1.1rem;
    }
}

/* ==========================================================================
   8. Contact Form
   ========================================================================== */
/* --- CONTACT SECTION --- */
.contact-section.light-theme {
    padding: 100px 0;
    background-color: #ffffff;
    color: var(--deep-charcoal);
    border-top: 1px solid #f0f0f0;
}

.contact-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.contact-header {
    text-align: center;
    margin-bottom: 50px;
}

.contact-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* FORM LAYOUT */
.contact-form {
    background: #f9f9f9;
    padding: 50px;
    border: 1px solid #eee;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.form-group {
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--sovereign-blue);
    margin-bottom: 8px;
}

.form-group input, 
.form-group select, 
.form-group textarea {
    background: transparent;
    border: none;
    border-bottom: 1px solid #ccc;
    padding: 10px 0;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus, 
.form-group textarea:focus {
    border-bottom: 1px solid var(--sovereign-blue);
}

/* FOOTER & BUTTON */
.form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    gap: 30px;
}

.privacy-note {
    font-size: 0.8rem;
    color: #777;
    line-height: 1.5;
    max-width: 350px;
}

.privacy-note strong {
    color: var(--deep-charcoal);
}

.submit-btn {
    background-color: var(--sovereign-blue);
    color: #fff;
    border: none;
    padding: 15px 35px;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    text-transform: uppercase;
    transition: opacity 0.3s;
}

.submit-btn:hover {
    opacity: 0.9;
}

@media (max-width: 768px) {
    .form-row, .form-footer {
        grid-template-columns: 1fr;
        flex-direction: column;
        align-items: flex-start;
    }
}

/* PRIVACY NOTE */
.privacy-note {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.privacy-note p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    line-height: 1.8;
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
}

.privacy-note strong {
    color: var(--sovereign-blue);
    font-weight: 700;
}

.tech-seal {
    display: block;
    margin-top: 0.5rem;
    font-family: 'Courier New', Courier, monospace; /* Inženjerski šmek */
    font-size: 0.75rem;
    color: var(--sovereign-blue);
    opacity: 0.8;
}

.lock-icon {
    margin-right: 8px;
    vertical-align: middle;
}

@media (max-width: 650px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}


.btn-form { align-self: flex-start; }

/* ==========================================================================
   9. Footer
   ========================================================================== */
.main-footer {
    background-color: var(--light-grey); /* Svetlo siva pozadina umesto tamne */
    color: var(--deep-charcoal); /* Tamni tekst za čitljivost */
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(0,0,0,0.05); /* Suptilna linija za razgraničenje */
}

.footer-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

/* Pošto je pozadina svetla, logo u footeru koristi standardne boje */
.footer-logo {
    opacity: 0.9;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 600; /* Malo jači font za bolju vidljivost na svetlom */
    color: var(--deep-charcoal);
    letter-spacing: 0.05em;
}

.footer-links a:hover {
    color: var(--sovereign-blue); /* Plavi hover efekat */
}

.copyright {
    text-align: center;
    font-size: 0.75rem;
    color: #888;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding-top: 1.5rem;
    margin-top: 2rem;
}

.copyright a {
    color: var(--sovereign-blue);
    font-weight: 400;
}

/* Prilagođavanje za mobilni */
@media (max-width: 768px) {
    .footer-flex {
        flex-direction: column;
        gap: 25px;
    }
    .footer-links {
        gap: 15px;
    }
}

/* ==========================================================================
   10. MEDIA QUERIES (Logika Responzivnosti)
   ========================================================================== */

/* Tablet i manji ekrani (Breakpoint - 992px) */
@media (max-width: 992px) {
    h1 { font-size: 1.6rem; }
    
    .fused-approach-wrapper { grid-template-columns: 1fr; gap: 0; } /* Vertikalno ređanje 2 kolone */
    .ars-skill, .quant-logic { padding: 2rem; border-bottom: none; }

    .market-grid { grid-template-columns: 1fr; gap: 20px; } /* Vertikalno ređanje 3 kolone */
    
    .architect-flex { flex-direction: column-reverse; text-align: center; gap: 30px; } /* Slika iznad teksta */
    .architect-photo { margin: 0 auto; }
}

/* Mobilni ekrani (Breakpoint - 768px) */
@media (max-width: 768px) {
    html { font-size: 14px; } /* Smanjuje bazu radi kompaktnosti */
    
    .logo-image { height: 28px; } /* Nešto manji logo radi uštede prostora */

    .hero { padding: 8rem 0 4rem; }
    
    .btn-header { display: none; } /* Uklanja Contact dugme u headeru */
    .mobile-menu-btn { display: flex; } /* Aktivira hamburger */

    .value-proposition, .target-market, .about-architect, .contact-section { padding: 4rem 0; }
    
    .ars-skill, .quant-logic { padding: 2rem; }
    
    .contact-form { padding: 0; width: 100%; }
    .btn-form { width: 100%; text-align: center; } /* Dugme celom širinom */
    
    .footer-flex { flex-direction: column; text-align: center; gap: 30px; }
    .footer-links { flex-direction: column; gap: 10px; }
}