@import url('https://fonts.googleapis.com/css2?family=Libertinus+Sans:ital,wght@0,400;0,700;1,400;1,700&display=swap');

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

:root {
    --primary-black: #000000;
    --primary-white: #ffffff;
    --gray-light: #f5f5f5;
    --gray-medium: #cccccc;
    --navy: #1e3a5f;
    --burgundy: #8b1538;
    
    /* Light mode (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-hero: #000000;
    --text-primary: #000000;
    --text-secondary: #ffffff;
    --border-color: #000000;
    --border-light: #cccccc;
    --accent-navy: #1e3a5f;
    --accent-burgundy: #8b1538;
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1a1a1a;
    --bg-hero: #000000;
    --text-primary: #ffffff;
    --text-secondary: #ffffff;
    --border-color: #ffffff;
    --border-light: #505050;
    --accent-navy: #5a8fd4;
    --accent-burgundy: #d45a7f;
}

body {
    font-family: 'Libertinus Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* General links in content */
a {
    color: var(--accent-navy);
    text-decoration: underline;
}

a:hover {
    color: var(--accent-burgundy);
}

/* Header */
header {
    background-color: var(--bg-primary);
    border-bottom: 2px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
}

.logo {
    height: 50px;
    width: auto;
}

/* Dark mode logo */
[data-theme="dark"] .logo {
    content: url('/images/MMCENT inverted.png');
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 101;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links li {
    display: flex;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    font-size: 1rem;
    line-height: 1.5;
}

.nav-links a:hover {
    opacity: 0.6;
    color: var(--text-primary);
}

.lang-switch {
    background-color: var(--text-primary);
    color: var(--bg-primary) !important;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-weight: 600;
    transition: opacity 0.3s, background-color 0.3s, color 0.3s;
}

.lang-switch:hover {
    opacity: 0.8 !important;
}

/* Dark Mode Toggle */
.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1.5;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
}

/* Hero Section */
.hero {
    background-color: var(--bg-hero);
    color: var(--text-secondary);
    padding: 6rem 2rem;
    text-align: center;
    transition: background-color 0.3s ease;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.section {
    margin-bottom: 4rem;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--border-color);
    padding-bottom: 0.5rem;
    transition: border-color 0.3s ease;
}

/* Plavi Čelik page section headers */
.app-hero ~ .container .section h2 {
    border-bottom-color: var(--navy);
}

.section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* Grid Layout */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    padding: 2rem;
    transition: transform 0.3s, background-color 0.3s, border-color 0.3s;
}

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

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Plavi Čelik page cards */
.app-hero ~ .container .card {
    border-color: var(--accent-navy);
}

.app-hero ~ .container .card h3 {
    color: var(--accent-navy);
}

/* App Page Specific */
.app-hero {
    background-color: var(--navy);
    color: var(--primary-white);
    padding: 4rem 2rem;
}

.app-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.app-features {
    list-style: none;
    padding-left: 0;
}

.app-features li {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--accent-burgundy);
    transition: background-color 0.3s ease;
}

.app-features li:before {
    content: "✓ ";
    font-weight: bold;
    margin-right: 0.5rem;
    color: var(--burgundy);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--primary-black);
    color: var(--primary-white);
    text-decoration: none;
    font-weight: 600;
    font-family: 'Libertinus Sans', sans-serif;
    font-size: 1rem;
    border: 2px solid var(--primary-black);
    transition: all 0.3s;
    margin-top: 1rem;
    cursor: pointer;
}

/* Plavi Čelik page buttons */
.app-hero ~ .container .btn {
    background-color: var(--navy);
    border-color: var(--navy);
}

.app-hero ~ .container .btn:hover {
    background-color: var(--burgundy);
    border-color: var(--burgundy);
    color: var(--primary-white);
}

.app-hero ~ .container .btn-secondary {
    background-color: var(--primary-white);
    color: var(--navy);
    border-color: var(--navy);
}

.app-hero ~ .container .btn-secondary:hover {
    background-color: var(--navy);
    color: var(--primary-white);
}

.btn:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--text-primary);
    color: var(--bg-primary);
}

/* Footer */
footer {
    background-color: var(--bg-hero);
    color: var(--text-secondary);
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
    border-top: 2px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

footer p {
    margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Libertinus Sans', sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s, background-color 0.3s, color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-light);
}

.form-group textarea {
    resize: vertical;
}

ul {
    list-style-position: inside;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    nav {
        flex-wrap: wrap;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        border-bottom: 2px solid var(--border-color);
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-height: 0;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        transition: max-height 0.3s ease-out;
    }
    
    .nav-links.active {
        max-height: min(70vh, 600px);
    }
    
    .nav-links li {
        width: 100%;
        border-top: 1px solid var(--border-light);
        display: block;
    }
    
    .nav-links a,
    .nav-links .theme-toggle,
    .nav-links .lang-switch {
        display: block;
        padding: 1rem;
        width: 100%;
        text-align: center;
    }
    
    .nav-links .theme-toggle {
        border: none;
        border-radius: 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .app-hero h1 {
        font-size: 1.8rem;
    }
    
    .section h2 {
        font-size: 1.5rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1rem;
    }
    
    .hero {
        padding: 3rem 1rem;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* Form status */
.form-error {
    color: var(--accent-burgundy);
    padding: 0.75rem 1rem;
    border: 1px solid var(--accent-burgundy);
    margin-bottom: 1rem;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    padding: 2.5rem 2rem;
    max-width: 480px;
    width: 90%;
    text-align: center;
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.modal h2 {
    margin-bottom: 0.75rem;
}

.modal p {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.modal .btn {
    min-width: 120px;
}