/* ============================================================
   Dinis Akulov — Data Science & AI Solutions
   Professional Company Profile
   ============================================================ */

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

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111620;
    --bg-card: #161c28;
    --bg-card-hover: #1c2332;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0b0;
    --text-muted: #5f6677;
    --accent: #4f8cff;
    --accent-hover: #6ba0ff;
    --accent-glow: rgba(79, 140, 255, 0.15);
    --border: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --nav-height: 72px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.section {
    padding: 100px 0;
}

.section__title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section__subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 640px;
    margin: 0 auto 56px;
    line-height: 1.7;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

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

.btn--primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.btn--outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn--outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.nav--scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.4);
}

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

.nav__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent), #7c6ff7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav__links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.925rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav__links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.2s ease;
}

.nav__links a:hover,
.nav__links a:focus-visible {
    color: var(--text-primary);
}

.nav__links a:hover::after,
.nav__links a:focus-visible::after {
    width: 100%;
}

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

/* Language Switch */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 0.85rem;
    font-weight: 600;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    padding: 4px 6px;
    transition: var(--transition);
    border-radius: 4px;
}

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

.lang-btn.active {
    color: var(--accent);
}

.lang-divider {
    color: var(--text-muted);
    user-select: none;
}

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

.nav__burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav__burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav__burger.active span:nth-child(2) {
    opacity: 0;
}
.nav__burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 999;
    padding: 32px 24px;
    flex-direction: column;
    gap: 8px;
}

.mobile-menu.open {
    display: flex;
}

.mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 500;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.mobile-menu a:hover {
    color: var(--text-primary);
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero__bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79, 140, 255, 0.08), transparent),
        radial-gradient(ellipse 50% 50% at 80% 80%, rgba(124, 111, 247, 0.06), transparent);
    pointer-events: none;
}

.hero__inner {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 60px 0;
}

.hero__overline {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 20px;
}

.hero__title {
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #e8eaed 0%, #9aa0b0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero__cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* --- About --- */
.about {
    background: var(--bg-secondary);
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.about__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: var(--transition);
}

.about__card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.about__icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.about__card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.about__card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* --- Services --- */
.services__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #7c6ff7);
    opacity: 0;
    transition: var(--transition);
}

.service__card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.service__card:hover::before {
    opacity: 1;
}

.service__icon {
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.service__card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.service__card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* --- Projects --- */
.projects__grid {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.project__card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.project__card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.project__image {
    position: relative;
    overflow: hidden;
    min-height: 320px;
}

.project__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.project__card:hover .project__image img {
    transform: scale(1.04);
}

.project__body {
    padding: 36px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project__category {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 12px;
}

.project__body h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
}

.project__body p {
    color: var(--text-secondary);
    font-size: 0.925rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.project__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project__tags span {
    font-size: 0.78rem;
    font-weight: 500;
    padding: 4px 12px;
    background: rgba(79, 140, 255, 0.1);
    color: var(--accent);
    border-radius: 20px;
    border: 1px solid rgba(79, 140, 255, 0.15);
}

.project__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    margin-top: auto;
}

.project__link:hover {
    gap: 12px;
    color: var(--accent-hover);
}

/* --- Achievements --- */
.achievements {
    background: var(--bg-secondary);
}

.achievements__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.achievement__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
}

.achievement__card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.achievement__number {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent), #7c6ff7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.achievement__label {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.achievement__detail {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* --- Contact --- */
.contact {
    text-align: center;
}

.contact__text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto 40px;
}

.contact__links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.contact__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
}

.contact__link:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.contact__link ion-icon {
    font-size: 1.3rem;
}

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

.footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

/* --- Process / How We Work --- */
.process {
    background: var(--bg-primary);
}

.process__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.process__card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.process__card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-3px);
}

.process__step {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: rgba(79, 140, 255, 0.08);
    position: absolute;
    top: 8px;
    right: 16px;
    line-height: 1;
    pointer-events: none;
}

.process__icon {
    font-size: 2.25rem;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.process__card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.process__card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* --- CTA Banner --- */
.cta {
    padding: 60px 0;
}

.cta__box {
    background: linear-gradient(135deg, #4f8cff 0%, #7c6ff7 100%);
    border-radius: var(--radius-lg);
    padding: 56px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta__box::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 120% at 50% 50%, rgba(255,255,255,0.1), transparent);
    pointer-events: none;
}

.cta__title {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 14px;
    letter-spacing: -0.02em;
    position: relative;
}

.cta__text {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 520px;
    margin: 0 auto 28px;
    line-height: 1.6;
    position: relative;
}

.btn--white {
    background: #fff;
    color: #4f8cff;
    font-weight: 700;
    position: relative;
}

.btn--white:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* --- Animations --- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate {
    animation: fadeUp 0.6s ease forwards;
}

.animate--hidden {
    opacity: 0;
    transform: translateY(24px);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about__grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }

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

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

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

    .project__image {
        max-height: 280px;
    }
}

@media (max-width: 768px) {
    .nav__links {
        display: none;
    }

    .nav__burger {
        display: flex;
    }

    .section {
        padding: 72px 0;
    }

    .section__title {
        font-size: 2rem;
    }

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

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

    .hero__title {
        font-size: 2.8rem;
    }

    .footer__inner {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero__cta {
        flex-direction: column;
        align-items: center;
    }

    .contact__links {
        flex-direction: column;
        align-items: center;
    }
}