:root {
    --color-primary: #0b1220;
    --color-secondary: #1f3a5f;
    --color-accent: #18a999;
    --color-background: #f7fafc;
    --color-surface: #ffffff;
    --color-text: #111827;
    --color-muted: #64748b;
    --color-border: #d7dee8;
    --color-error: #b42318;
    --color-success: #067647;
    --color-white: #ffffff;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-heading: var(--font-sans);
    --shadow-card: 0 18px 45px rgba(15, 23, 42, 0.08);
    --radius-card: 18px;
    --radius-control: 10px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-background);
    color: var(--color-text);
    font-family: var(--font-sans);
    line-height: 1.6;
}

a {
    color: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(24, 169, 153, 0.45);
    outline-offset: 3px;
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(11, 18, 32, 0.96);
    color: var(--color-white);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 76px;
}

.logo {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    padding: 4px;
    background: var(--color-white);
    border-radius: 50%;
    text-decoration: none;
}

.logo img {
    display: block;
    width: auto;
    height: 54px;
}

/* Menu toggle (mobile) */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-control);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    margin: 0 auto;
    background: var(--color-white);
    transition: transform 0.25s, opacity 0.25s;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Nav */
.nav ul,
.footer ul {
    display: flex;
    gap: 18px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.nav a,
.footer a,
.lang-switcher a {
    text-decoration: none;
}

.nav a,
.lang-switcher a {
    color: rgba(255, 255, 255, 0.82);
    font-weight: 600;
}

.nav a:hover,
.lang-switcher a:hover,
.lang-switcher a.active {
    color: var(--color-accent);
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    white-space: nowrap;
}

/* Sections */
main section {
    padding: 72px 0;
}

.hero,
.about-hero,
.services-hero,
.realisations-hero,
.contact-hero {
    color: var(--color-white);
    background:
        radial-gradient(circle at 15% 20%, rgba(24, 169, 153, 0.32), transparent 28%),
        linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.hero {
    min-height: 520px;
    display: grid;
    align-items: center;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    line-height: 1.15;
    margin: 0 0 18px;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 5.5rem);
    letter-spacing: -0.05em;
}

h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
}

p {
    margin: 0 0 18px;
}

.tagline,
.about-hero p,
.services-hero p,
.realisations-hero p,
.contact-hero p {
    max-width: 720px;
    color: rgba(255, 255, 255, 0.82);
    font-size: 1.2rem;
}

.hero-subtext {
    max-width: 620px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
    margin-bottom: 28px;
}

.lead-text {
    font-size: 1.15rem;
    color: var(--color-muted);
}

.cta-text {
    color: rgba(255, 255, 255, 0.7);
    max-width: 560px;
    margin: 0 auto 24px;
}

/* Buttons */
.btn-primary,
button[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 22px;
    border: 0;
    border-radius: var(--radius-control);
    background: var(--color-accent);
    color: var(--color-primary);
    cursor: pointer;
    font-weight: 800;
    text-decoration: none;
    box-shadow: 0 12px 28px rgba(24, 169, 153, 0.24);
}

.btn-primary:hover,
button[type="submit"]:hover {
    filter: brightness(0.95);
}

/* Grids */
.values-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.team-grid,
.services-list .container,
.realisations-list .container,
.expertise-grid,
.footer-content {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

/* Cards */
.value-card,
.team-member,
.service-card,
.realisation-card,
.tech-card,
.expertise-card,
.contact-info,
.contact-form,
.legal-notice .container,
.privacy-policy .container {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 28px;
    box-shadow: var(--shadow-card);
}

.value-card h3,
.service-card h2,
.realisation-card h2,
.tech-card h3,
.expertise-card h3 {
    color: var(--color-secondary);
}

.service-card,
.realisation-card {
    position: relative;
    overflow: hidden;
}

.service-card::before,
.realisation-card::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(24, 169, 153, 0.12), rgba(31, 58, 95, 0.04));
}

.service-card > *,
.realisation-card > * {
    position: relative;
}

.fa-icon {
    display: inline-flex;
    width: 42px;
    height: 42px;
    padding: 10px;
    margin-bottom: 18px;
    border-radius: 14px;
    background: var(--color-primary);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.14);
}

.realisation-card {
    min-height: 260px;
    padding: 34px;
    background:
        radial-gradient(circle at 90% 12%, rgba(24, 169, 153, 0.2), transparent 32%),
        linear-gradient(160deg, #ffffff, #eef6f8);
}

.realisations-list .container {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
}

.technologies {
    background: var(--color-surface);
}

.technologies .lead-text {
    max-width: 840px;
}

/* CTA */
.cta {
    text-align: center;
    background: var(--color-primary);
    color: var(--color-white);
}

/* Contact */
.contact-content .container {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 24px;
}

.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 7px;
    font-weight: 700;
}

input,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    color: var(--color-text);
    font: inherit;
}

textarea {
    resize: vertical;
}

.captcha-group {
    display: grid;
    gap: 10px;
}

.captcha-image {
    display: block;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    background: var(--color-background);
}

.honeypot {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-error,
.form-success {
    padding: 12px 14px;
    margin-bottom: 18px;
    border-radius: var(--radius-control);
    font-weight: 700;
}

.form-error {
    color: var(--color-error);
    background: #fef3f2;
}

.form-success {
    color: var(--color-success);
    background: #ecfdf3;
}

/* Legal */
.legal-notice .container,
.privacy-policy .container {
    max-width: 800px;
    padding: 28px 32px;
}

.legal-notice,
.privacy-policy {
    padding: 48px 0;
}

.legal__title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-primary);
}

.legal__subtitle {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 8px;
    color: var(--color-secondary);
}

.legal__intro p {
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: 24px;
}

.legal__block {
    margin-bottom: 20px;
}

.legal__block:last-child {
    margin-bottom: 0;
}

.legal__block p,
.legal__block li {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text);
}

.legal__block p {
    margin-bottom: 10px;
}

.legal__block ul {
    padding-left: 20px;
    margin: 0 0 12px;
}

.legal__block li {
    margin-bottom: 6px;
}

.legal__version code {
    display: inline-block;
    padding: 4px 8px;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    font-size: 0.85rem;
    color: var(--color-muted);
}

/* Footer */
.footer {
    padding: 48px 0 24px;
    background: var(--color-primary);
    color: rgba(255, 255, 255, 0.78);
}

.footer h3,
.footer h4 {
    color: var(--color-white);
}

.footer-about {
    max-width: 340px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.9rem;
}

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

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: underline;
}

.footer-bottom a:hover {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding-top: 28px;
    margin-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
    margin: 0;
}

.footer-bottom nav {
    display: flex;
    gap: 18px;
    margin-left: auto;
    text-align: right;
}

/* Error 404 */
.error-404 {
    text-align: center;
    min-height: 400px;
    display: grid;
    align-items: center;
    color: var(--color-white);
    background:
        radial-gradient(circle at 15% 20%, rgba(24, 169, 153, 0.32), transparent 28%),
        linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.error-404 h1 {
    font-size: clamp(5rem, 18vw, 12rem);
    margin-bottom: 8px;
}

.error-404 p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 1024px) {
    .values-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tech-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 860px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(11, 18, 32, 0.98);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        padding: 16px;
    }

    .nav.open {
        display: block;
    }

    .nav ul {
        flex-direction: column;
        gap: 12px;
    }

    .header .container {
        position: relative;
        flex-wrap: wrap;
    }

    .footer-content,
    .contact-content .container {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-bottom nav {
        margin-left: 0;
        text-align: left;
    }

    .values-grid,
    .tech-grid,
    .team-grid,
    .services-list .container,
    .realisations-list .container,
    .expertise-grid {
        grid-template-columns: 1fr;
    }

    main section {
        padding: 52px 0;
    }

    .hero {
        min-height: 420px;
    }

    .lang-switcher {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .values-grid {
        grid-template-columns: 1fr;
    }

    .header .container {
        gap: 12px;
    }

    .logo {
        max-width: calc(100% - 120px);
    }

    .logo img {
        height: 44px;
    }
}