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

:root {
    --color-bg: #0a0a0f;
    --color-bg-alt: #12121a;
    --color-bg-card: #1a1a26;
    --color-bg-card-hover: #222233;
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-accent: #22d3ee;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-border: #1e293b;
    --color-border-light: #334155;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
    --header-height: 72px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ===== Container ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-height);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.header--scrolled {
    background: rgba(10, 10, 15, 0.95);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.125rem;
}

.logo__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    color: #fff;
}

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

.nav__link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition);
}

.nav__link:hover {
    color: var(--color-text);
}

.nav__link:hover::after {
    width: 100%;
}

.header__actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    background: none;
    border: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 0.8125rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
}

.lang-switch__current {
    color: var(--color-primary-light);
}

.lang-switch__separator {
    color: var(--color-text-muted);
}

.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.burger span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

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

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

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

/* ===== Hero ===== */
.hero {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.hero__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 40px;
    max-width: 500px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-family: var(--font-main);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.hero__visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    width: 320px;
    height: 320px;
}

.hero__cell {
    border-radius: var(--radius-md);
    animation: pulse 4s ease-in-out infinite;
}

.hero__cell--1 {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(99, 102, 241, 0.1));
    border: 1px solid rgba(99, 102, 241, 0.2);
    animation-delay: 0s;
}

.hero__cell--2 {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.3), rgba(34, 211, 238, 0.1));
    border: 1px solid rgba(34, 211, 238, 0.2);
    animation-delay: 1s;
}

.hero__cell--3 {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.3), rgba(168, 85, 247, 0.1));
    border: 1px solid rgba(168, 85, 247, 0.2);
    animation-delay: 2s;
}

.hero__cell--4 {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.3), rgba(34, 197, 94, 0.1));
    border: 1px solid rgba(34, 197, 94, 0.2);
    animation-delay: 3s;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
}

/* ===== Sections ===== */
.section {
    padding: 100px 0;
}

.section__title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.section__subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 48px;
    max-width: 600px;
}

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

.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-top: 48px;
}

.about__text p {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about__cards {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.info-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    transition: var(--transition);
}

.info-card:hover {
    border-color: var(--color-border-light);
    background: var(--color-bg-card-hover);
}

.info-card__label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.info-card__value {
    font-size: 0.9375rem;
    color: var(--color-text);
    font-weight: 500;
}

/* ===== OKVED ===== */
.okved__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
    margin-top: 48px;
}

.okved__item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
    flex-wrap: wrap;
}

.okved__item:hover {
    border-color: var(--color-border-light);
}

.okved__item--primary {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.05);
}

.okved__code {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 64px;
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-light);
    border-radius: 6px;
    font-size: 0.8125rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.okved__label {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    background: rgba(34, 211, 238, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.okved__desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    width: 100%;
}

/* ===== IT Codes ===== */
.it-codes {
    background: var(--color-bg-alt);
}

.it-codes__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.it-code-card {
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.it-code-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition);
}

.it-code-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
}

.it-code-card:hover::before {
    opacity: 1;
}

.it-code-card__code {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary-light);
    margin-bottom: 12px;
}

.it-code-card__title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.it-code-card__desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== Services ===== */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.service-card {
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.service-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.service-card__icon {
    color: var(--color-primary-light);
    margin-bottom: 20px;
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.service-card__desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-card__features {
    margin-bottom: 24px;
    flex-grow: 1;
}

.service-card__features li {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.service-card__features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.service-card__price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary-light);
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

/* ===== Tech ===== */
.tech {
    background: var(--color-bg-alt);
}

.tech__categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.tech-category {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.tech-category__title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

.tech-category__items {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
}

.tech-badge:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

.tech-badge__icon {
    font-size: 0.5rem;
    color: var(--color-accent);
}

/* ===== Contacts ===== */
.contacts__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-top: 48px;
}

.contacts__info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-item__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-primary-light);
}

.contact-item__label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.contact-item__value {
    font-size: 0.9375rem;
    color: var(--color-text);
}

.contact-item__link {
    transition: color var(--transition);
}

.contact-item__link:hover {
    color: var(--color-primary-light);
}

.contacts__legal {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.contacts__legal-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.legal-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.legal-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.legal-item__label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.legal-item__value {
    font-size: 0.9375rem;
    color: var(--color-text);
}

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer__copy {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.footer__inn {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ===== Mobile Nav Overlay ===== */
.nav-overlay {
    display: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero__inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero__subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero__visual {
        display: none;
    }

    .hero__title {
        font-size: 2.75rem;
    }

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

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

    .it-codes__grid {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 768px) {
    .nav {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 99;
    }

    .nav.active {
        display: flex;
    }

    .nav__link {
        font-size: 1.25rem;
    }

    .burger {
        display: flex;
    }

    .hero {
        padding-top: calc(var(--header-height) + 40px);
        padding-bottom: 40px;
        min-height: auto;
    }

    .hero__title {
        font-size: 2rem;
    }

    .hero__subtitle {
        font-size: 1rem;
    }

    .section {
        padding: 60px 0;
    }

    .section__title {
        font-size: 1.75rem;
    }

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

    .footer__inner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 1.75rem;
    }

    .container {
        padding: 0 16px;
    }

    .service-card,
    .it-code-card {
        padding: 24px;
    }
}