/* Maria Morozova — Personal Site */

:root {
    --bg: #0a0a0f;
    --surface: #14141f;
    --surface-hover: #1c1c2e;
    --border: #252538;
    --text: #e5e5ee;
    --text-secondary: #8888a0;
    --accent: #a78bfa;
    --accent-hover: #8b5cf6;
    --accent-glow: rgba(167, 139, 250, 0.12);
    --radius: 12px;
    --max-width: 800px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    text-decoration: underline;
}

/* Layout */

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

section {
    padding: 80px 0;
}

section h2 {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 48px;
    letter-spacing: -0.01em;
}

/* Nav */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent);
    letter-spacing: 0.02em;
}

.nav-logo:hover {
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text);
    text-decoration: none;
}

/* Hero */

.hero {
    text-align: center;
    padding: 140px 0 80px;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #6d5bbe);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
    box-shadow: 0 0 40px var(--accent-glow);
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.hero .tagline {
    font-size: 1.2rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 4px;
}

.hero .subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.banner-quote {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 28px;
    padding: 12px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: inline-block;
    background: var(--surface);
}

.hero-meta {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.hero-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-hover);
}

/* About */

.about {
    border-top: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: border-color 0.2s, transform 0.15s;
}

.about-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.about-icon {
    color: var(--accent);
    margin-bottom: 14px;
    line-height: 1;
}

.about-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Experience */

.experience {
    border-top: 1px solid var(--border);
}

.timeline {
    position: relative;
    padding-left: 32px;
    max-width: 600px;
    margin: 0 auto;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--surface);
    border: 2px solid var(--border);
    z-index: 1;
}

.timeline-marker.current {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: block;
    margin-bottom: 4px;
}

.timeline-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.timeline-company {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Skills */

.skills {
    border-top: 1px solid var(--border);
}

.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.skill-group h3 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.825rem;
    color: var(--text);
    transition: border-color 0.2s, background 0.2s;
}

.tag:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

/* Certifications */

.certifications {
    border-top: 1px solid var(--border);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.cert-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: border-color 0.2s;
}

.cert-card:hover {
    border-color: var(--accent);
}

.cert-issuer {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    display: block;
    margin-bottom: 6px;
}

.cert-card h3 {
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.4;
}

/* Testimonials */

.testimonials {
    border-top: 1px solid var(--border);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.testimonial-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    border-left: 3px solid var(--accent);
}

.testimonial-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    font-style: italic;
}

/* Contact */

.contact {
    border-top: 1px solid var(--border);
    text-align: center;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 28px;
}

.contact-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */

.footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Responsive */

@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero .tagline {
        font-size: 1.05rem;
    }

    .banner-quote {
        font-size: 0.75rem;
        letter-spacing: 0.08em;
    }

    .about-grid,
    .testimonial-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: 56px 0;
    }

    .hero {
        padding: 100px 0 56px;
    }

    .nav-links {
        gap: 16px;
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .timeline {
        padding-left: 28px;
    }
}