/* ============================================
   Yulia Ekeltchik - Professional Website
   Color Palette: Mint / Turquoise
   ============================================ */

:root {
    --mint-50: #f0fdfa;
    --mint-100: #ccfbf1;
    --mint-200: #99f6e4;
    --mint-300: #5eead4;
    --mint-400: #2dd4bf;
    --mint-500: #14b8a6;
    --mint-600: #0d9488;
    --mint-700: #0f766e;
    --mint-800: #115e59;
    --mint-900: #134e4a;
    --mint-950: #042f2e;

    --gray-50: #f8fafb;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    --white: #ffffff;
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    color: var(--gray-800);
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 12px 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

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

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.navbar.scrolled .nav-logo {
    color: var(--mint-700);
}

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

.nav-links a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--mint-300);
    transition: var(--transition);
}

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

.navbar.scrolled .nav-links a {
    color: var(--gray-600);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--mint-600);
}

.navbar.scrolled .nav-links a::after {
    background: var(--mint-500);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--mint-900) 0%, var(--mint-700) 30%, var(--mint-500) 70%, var(--mint-400) 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(255,255,255,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 40%);
    z-index: -1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--white), transparent);
}

.hero-decoration {
    position: absolute;
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
    width: 600px;
    height: 600px;
    opacity: 1;
    animation: spin-slow 60s linear infinite;
}

@keyframes spin-slow {
    from { transform: translateY(-50%) rotate(0deg); }
    to { transform: translateY(-50%) rotate(360deg); }
}

.hero-content {
    padding: 120px 0 80px;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--mint-200);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.hero-name {
    font-family: var(--font-heading);
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-weight: 300;
    color: var(--mint-100);
    margin-bottom: 8px;
}

.hero-location {
    font-size: 0.95rem;
    color: var(--mint-200);
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-cta {
    display: inline-block;
    padding: 14px 36px;
    background: rgba(255, 255, 255, 0.15);
    color: var(--white);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    transition: var(--transition);
}

.hero-cta:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

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

.section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 60px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--mint-400), var(--mint-600));
    margin: 16px auto 0;
    border-radius: 2px;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--gray-600);
    font-size: 1.02rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--mint-700);
    font-weight: 600;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-card {
    padding: 28px;
    background: var(--mint-50);
    border-radius: 12px;
    border: 1px solid var(--mint-100);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(13, 148, 136, 0.1);
    border-color: var(--mint-200);
}

.stat-icon {
    color: var(--mint-500);
    display: block;
    margin-bottom: 8px;
    line-height: 1;
}

.stat-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 6px;
}

.stat-card p {
    color: var(--gray-500);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Expertise Section */
.expertise {
    background: var(--gray-50);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.expertise-card {
    background: var(--white);
    padding: 36px 28px;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.expertise-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(13, 148, 136, 0.1);
    border-color: var(--mint-300);
}

.expertise-icon {
    color: var(--mint-500);
    margin-bottom: 20px;
}

.expertise-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 12px;
}

.expertise-card p {
    color: var(--gray-500);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* Background / Timeline Section */
.timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--mint-300), var(--mint-100));
}

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

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

.timeline-marker {
    position: absolute;
    left: -36px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--white);
    border: 3px solid var(--mint-400);
    z-index: 1;
}

.timeline-item:first-child .timeline-marker {
    background: var(--mint-400);
    border-color: var(--mint-400);
}

.timeline-content {
    background: var(--white);
    padding: 28px 32px;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    border-color: var(--mint-200);
}

.timeline-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--mint-600);
    background: var(--mint-50);
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.timeline-content h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.timeline-org {
    font-size: 0.9rem;
    color: var(--mint-600);
    font-weight: 500;
    margin-bottom: 12px;
}

.timeline-content p:last-child {
    color: var(--gray-500);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Mobile Nav Toggle - hidden on desktop */
.nav-toggle {
    display: none !important;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
    -webkit-appearance: none;
    appearance: none;
    outline: none;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    border-radius: 1px;
}

.navbar.scrolled .nav-toggle span {
    background: var(--gray-700);
}

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

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

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

/* Contact Section */
.contact {
    background: linear-gradient(135deg, var(--mint-900) 0%, var(--mint-700) 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 15% 85%, rgba(255,255,255,0.04) 0%, transparent 50%),
        radial-gradient(circle at 85% 15%, rgba(255,255,255,0.03) 0%, transparent 40%);
}

.contact .section-title {
    color: var(--white);
    position: relative;
    z-index: 1;
}

.contact .section-title::after {
    background: linear-gradient(90deg, var(--mint-300), var(--mint-200));
}

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.contact-intro {
    color: var(--mint-100);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 40px;
}

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

.contact-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 28px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

a.contact-card:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    padding: 30px 0;
    text-align: center;
    background: var(--mint-950);
    color: var(--mint-300);
    font-size: 0.85rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 600px) {
    .section {
        padding: 70px 0;
    }

    .nav-toggle {
        display: flex !important;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        flex-direction: column;
        background: var(--white);
        padding: 100px 40px 40px;
        gap: 24px;
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
        transition: var(--transition);
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links a {
        color: var(--gray-700) !important;
        font-size: 1.05rem;
    }

    .nav-links a:hover {
        color: var(--mint-600) !important;
    }

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

    .hero-content {
        padding: 100px 0 60px;
    }

    .hero-decoration {
        width: 400px;
        height: 400px;
        right: -150px;
    }

    .section-title {
        font-size: 1.8rem;
    }

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

    .timeline {
        padding-left: 30px;
    }
}