/* ===================================
   NGP VALTER - Monochrome Modern Design
   =================================== */

:root {
    --primary: #ffffff;
    --primary-hover: #e0e0e0;
    --black: #0a0a0a;
    --dark-surface: #1a1a1a;
    --white: #ffffff;
    --gray-text: #a0a0a0;
    --white-text: #ffffff;
    --soft-white: #e0e0e0;
    --gray-border: #333333;
    --radius-lg: 1rem;
    --radius-md: 0.5rem;
    --container-max: 1280px;
    
    /* Shadows */
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-md: 0 20px 50px rgba(0,0,0,0.8);
    --shadow-lg: 0 25px 50px rgba(0,0,0,0.9);
    --shadow-primary: 0 10px 30px rgba(255, 255, 255, 0.1);
    --shadow-card: 0 8px 20px rgba(0,0,0,0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--black);
    color: var(--white-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Tipografija */
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 900; line-height: 1.1; text-transform: uppercase; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800; text-transform: uppercase; letter-spacing: -0.01em; }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); font-weight: 700; text-transform: uppercase; }

.text-primary { color: var(--primary); }
.small-text { font-size: 0.75rem; opacity: 0.6; font-weight: 600; margin-top: -0.5rem; }

/* Gumbi */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    font-size: 0.9rem;
    text-decoration: none;
}

.btn-primary { background: var(--white); color: var(--black); box-shadow: var(--shadow-primary); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }

.btn-outline { background: transparent; border: 1px solid var(--white); color: var(--white); }
.btn-outline:hover { background: var(--white); color: var(--black); }

.btn-dark { background: var(--black); color: var(--white); border: 1px solid var(--gray-border); }
.btn-dark:hover { background: #222; }

.btn-block { width: 100%; margin-top: auto; height: 3.5rem; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0; width: 100%;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--gray-border);
    z-index: 1000;
    height: 70px;
}

.nav-content { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.logo img { height: 35px; filter: brightness(0) invert(1); }

.nav-links { display: flex; gap: 2rem; }
.nav-links a { text-decoration: none; color: var(--soft-white); font-weight: 500; transition: color 0.3s; position: relative; font-size: 0.9rem; }
.nav-links a:hover { color: var(--white); }

.mobile-menu-btn { display: none; background: none; border: none; color: var(--white); cursor: pointer; }

@media (max-width: 992px) {
    .mobile-menu-btn { display: block; }
    .nav-links {
        position: fixed;
        top: 70px; left: 0; width: 100%;
        background: var(--black);
        flex-direction: column;
        padding: 2rem 1.5rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--gray-border);
        transform: translateY(-150%);
        transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
        text-align: center;
    }
    .nav-links.active { transform: translateY(0); }
    .nav-links a { font-size: 1.2rem; }
}

/* Hero */
.hero { padding: 10rem 0 6rem; background: var(--black); position: relative; text-align: center; }
.hero-text-only { display: flex; justify-content: center; }
.hero-text { max-width: 800px; }
.hero p { font-size: 1.2rem; color: var(--gray-text); margin-bottom: 2.5rem; margin-left: auto; margin-right: auto; }
.hero-btns { display: flex; gap: 1rem; justify-content: center; }

/* Mission Section */
.mission { padding: 6rem 0; background: var(--dark-surface); }
.mission-content { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
@media (max-width: 992px) {
    .mission-content { grid-template-columns: 1fr; text-align: center; }
}

.mission-text p { color: var(--gray-text); margin-bottom: 2rem; }
.mission-text ul { list-style: none; }
.mission-text li { 
    color: var(--soft-white); 
    margin-bottom: 1rem; 
    padding-left: 1.5rem; 
    position: relative; 
    font-weight: 500;
}
.mission-text li::before { 
    content: "→"; 
    position: absolute; 
    left: 0; 
    color: var(--white); 
}

.mission-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.stat-item { text-align: center; }
.stat-number { font-size: 2.5rem; font-weight: 900; color: var(--white); }
.stat-label { font-size: 0.8rem; color: var(--gray-text); text-transform: uppercase; letter-spacing: 0.05em; }

/* Activities Section */
.activities { padding: 6rem 0; background: var(--black); }
.activities-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; max-width: 1100px; margin: 0 auto; }
@media (min-width: 768px) {
    .activities-grid { grid-template-columns: repeat(3, 1fr); }
}

.activity-card { 
    text-align: center; 
    padding: 3rem 2rem; 
    border-radius: var(--radius-md); 
    background: var(--dark-surface); 
    border: 1px solid var(--gray-border);
    transition: all 0.3s ease; 
}
.activity-card:hover { transform: translateY(-8px); border-color: var(--white); }
.activity-card .activity-icon { 
    width: 60px; height: 60px; margin: 0 auto 1.5rem; 
    display: flex; align-items: center; justify-content: center; 
    border-radius: 50%; background: var(--black); 
}
.activity-card .activity-icon i { font-size: 1.5rem; color: var(--white); }
.activity-card h3 { margin-bottom: 1rem; color: var(--white); }
.activity-card p { font-size: 0.95rem; color: var(--gray-text); line-height: 1.6; }

/* About Section */
.about { padding: 6rem 0; background: var(--dark-surface); }
.about-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 4rem; align-items: center; }
@media (max-width: 992px) {
    .about-grid { grid-template-columns: 1fr; text-align: center; }
    .about-grid .about-image { order: -1; margin-bottom: 3rem; }
}

.about-text p { color: var(--gray-text); margin-bottom: 1.5rem; font-size: 1.1rem; }
.about-image img { width: 100%; height: auto; filter: grayscale(1); opacity: 0.8; }

/* Contact Section */
.contact { padding: 6rem 0; background: var(--black); border-top: 1px solid var(--gray-border); }
.contact-grid { max-width: 900px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
@media (max-width: 992px) {
    .contact-grid { grid-template-columns: 1fr; text-align: center; }
}

.contact-info h4 { color: var(--white); margin-bottom: 0.5rem; font-size: 1.1rem; }
.contact-info p { color: var(--gray-text); margin-bottom: 2rem; font-size: 1.2rem; }

.contact-form form { background: var(--dark-surface); padding: 2rem; border-radius: var(--radius-md); border: 1px solid var(--gray-border); }
.form-group { margin-bottom: 1.5rem; }
.form-group input, .form-group textarea { 
    width: 100%; padding: 1rem; 
    background: var(--black); 
    border: 1px solid var(--gray-border); 
    color: var(--white); 
    border-radius: 0.4rem; 
    font-size: 1rem;
    transition: border-color 0.3s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--white); }

/* Footer */
.footer { border-top: 1px solid var(--gray-border); padding: 5rem 0 2rem; background: var(--black); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; }

@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
}

.footer-brand img { height: 40px; margin-bottom: 1.5rem; filter: brightness(0) invert(1); }
.footer-brand p { color: var(--gray-text); font-size: 0.9rem; line-height: 1.7; }

.footer-links h4, .footer-contact h4 { margin-bottom: 1.5rem; font-size: 0.7rem; letter-spacing: 0.15em; font-weight: 800; color: var(--white); text-transform: uppercase; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 0.8rem; }
.footer-links a { color: var(--gray-text); text-decoration: none; transition: color 0.3s; font-weight: 500; font-size: 0.85rem; }
.footer-links a:hover { color: var(--white); }

.footer-bottom { margin-top: 4rem; text-align: center; padding-top: 2rem; border-top: 1px solid var(--gray-border); color: var(--gray-text); font-size: 0.8rem; font-weight: 500; }

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--white);
    color: var(--black);
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--primary-hover);
}