/* ===== CSS Variables ===== */
:root {
    --color-dark: #1a1a2e;
    --color-dark-light: #25253d;
    --color-gray: #4a4a5a;
    --color-light: #f5f5f7;
    --color-white: #ffffff;
    --color-accent: #10b981;
    --color-accent-dark: #059669;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --container-width: 1140px;
    --header-height: 70px;

    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    transform: translateY(-2px);
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
}

.logo:hover {
    color: var(--color-accent);
}

.nav-list {
    display: flex;
    gap: 32px;
}

.nav-list a {
    font-weight: 500;
    color: var(--color-gray);
}

.nav-list a:hover {
    color: var(--color-accent);
}

/* Language Switch */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    background-color: var(--color-light);
    padding: 8px 16px;
    border-radius: 20px;
}

.lang-link {
    color: var(--color-gray);
}

.lang-link:hover,
.lang-link.active {
    color: var(--color-accent);
}

.lang-separator {
    color: var(--color-gray);
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-dark);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-light) 100%);
    color: var(--color-white);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-light);
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0.9;
}

/* ===== Sections ===== */
.section {
    padding: 80px 0;
}

.section h2 {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--color-dark);
}

/* ===== About Section ===== */
.about {
    background-color: var(--color-white);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    color: var(--color-gray);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

/* Tech List */
.tech-list {
    text-align: left;
    max-width: 700px;
    margin: 20px auto 40px;
}

.tech-list li {
    margin-bottom: 12px;
    color: var(--color-gray);
    line-height: 1.5;
}

.tech-list li strong {
    color: var(--color-dark);
}

.about-highlights {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.about-highlights li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--color-dark);
}

.about-highlights li::before {
    content: '';
    width: 8px;
    height: 8px;
    background-color: var(--color-accent);
    border-radius: 50%;
}

.about-highlights a {
    color: var(--color-accent);
    text-decoration: underline;
}

.about-highlights a:hover {
    color: var(--color-accent-dark);
}

/* ===== Services Section ===== */
.services {
    background-color: var(--color-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background-color: var(--color-white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    color: var(--color-accent);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
    color: var(--color-dark);
}

.service-card p {
    color: var(--color-gray);
    font-size: 0.95rem;
}

/* ===== Contact Section ===== */
.contact {
    background-color: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--color-dark);
}

.contact-info > p {
    color: var(--color-gray);
    margin-bottom: 30px;
}

.contact-item {
    margin-bottom: 20px;
}

.contact-item strong {
    display: block;
    color: var(--color-dark);
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--color-gray);
}

.contact-nip {
    margin-top: 10px;
    font-weight: 500;
    color: var(--color-dark);
}

/* Contact Form */
.contact-form {
    background-color: var(--color-light);
    padding: 40px;
    border-radius: 12px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    font-family: var(--font-family);
    border: 2px solid transparent;
    border-radius: 8px;
    background-color: var(--color-white);
    transition: var(--transition);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-light);
    padding: 50px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
}

.footer-brand .logo {
    color: var(--color-white);
    font-size: 1.25rem;
}

.footer-brand p {
    margin-top: 10px;
    color: var(--color-gray);
}

.footer-info p {
    color: var(--color-gray);
    font-size: 0.9rem;
    text-align: right;
}

.footer-bottom {
    border-top: 1px solid var(--color-dark-light);
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    color: var(--color-gray);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section {
        padding: 60px 0;
    }

    .section h2 {
        font-size: 1.75rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
        order: 2;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .lang-switch {
        order: 1;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer-info p {
        text-align: center;
    }

    .about-highlights {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 130px 0 70px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .contact-form {
        padding: 25px;
    }

    .btn {
        padding: 12px 24px;
    }
}