/* ============================================
   Yuliia Diakova — Portfolio
   Clean, clickworks.me-inspired design
   ============================================ */

:root {
    --accent: #2ec4b6;
    --accent-dark: #25a99d;
    --accent-light: #e8f8f6;
    --text: #1a1a2e;
    --text-light: #555;
    --text-muted: #888;
    --bg: #ffffff;
    --bg-alt: #f9fafb;
    --border: #e8e8e8;
    --radius: 8px;
    --shadow: 0 2px 12px rgba(0,0,0,0.06);
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Navigation ---- */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: box-shadow 0.3s ease;
}

.nav.scrolled {
    box-shadow: 0 1px 8px rgba(0,0,0,0.08);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color 0.2s ease;
    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 {
    color: var(--accent);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

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

/* ---- Hero ---- */

.hero {
    padding: 160px 0 100px;
    text-align: center;
}

.hero-greeting {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 12px;
}

.hero-name {
    font-family: var(--font-heading);
    font-size: 3.2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-light);
    margin-bottom: 8px;
}

.hero-location {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.hero-intro {
    max-width: 600px;
    margin: 0 auto 36px;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-light);
}

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

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: 2px solid var(--accent);
}

.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46,196,182,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
}

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

/* ---- Section Shared ---- */

.section-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text);
    letter-spacing: -0.01em;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ---- About ---- */

.about {
    padding: 80px 0;
    background: var(--bg-alt);
}

.about-content {
    max-width: 680px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 18px;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-light);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ---- Skills ---- */

.skills {
    padding: 80px 0;
}

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

.skill-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    transition: all 0.25s ease;
}

.skill-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-3px);
}

.skill-icon {
    font-size: 1.8rem;
    margin-bottom: 16px;
}

.skill-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
}

.skill-card p {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text-light);
}

/* ---- Experience ---- */

.experience {
    padding: 80px 0;
    background: var(--bg-alt);
}

.timeline {
    max-width: 720px;
    margin: 0 auto;
    position: relative;
    padding-left: 32px;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 3px solid var(--accent);
    z-index: 1;
}

.timeline-header {
    margin-bottom: 14px;
}

.timeline-header h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.timeline-company {
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent);
    margin-right: 12px;
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

.timeline-content li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 8px;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-light);
}

.timeline-content li::before {
    content: '–';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
}

.education {
    max-width: 720px;
    margin: 56px auto 0;
    padding: 28px 32px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.education h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.education p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ---- Contact ---- */

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

.contact-intro {
    font-size: 1.05rem;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-size: 1rem;
    transition: color 0.2s ease;
    padding: 12px 24px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.contact-item:hover {
    color: var(--accent);
    border-color: var(--border);
    background: var(--bg-alt);
}

.contact-icon {
    font-size: 1.2rem;
}

/* ---- Footer ---- */

.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(8px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 72px;
    }

    .hero-name {
        font-size: 2.2rem;
    }

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

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .section-title {
        font-size: 1.6rem;
        margin-bottom: 36px;
    }

    .about,
    .skills,
    .experience,
    .contact {
        padding: 56px 0;
    }

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

@media (min-width: 769px) and (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}