/* Clone of oleksii210.vercel.app - Portfolio */

:root {
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-section: #0d1117;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --border: #30363d;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --radius: 8px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header / Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  gap: 1rem;
  position: relative;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text) !important;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-social {
  display: flex;
  gap: 0.75rem;
}

.nav-social a {
  color: var(--text-muted);
  font-size: 1.1rem;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.25rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-social {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
  }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(88, 166, 255, 0.08), transparent),
    linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-section) 100%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-name {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-tagline .typed {
  color: var(--accent);
  font-weight: 600;
}

.hero-tagline .cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-contacts {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.hero-contacts a {
  color: var(--text-muted);
  font-size: 1.25rem;
}

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

.custom-colors {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.7;
}

/* Sections */
.section {
  padding: 4rem 0;
  background: var(--bg-section);
}

.section:nth-child(even) {
  background: #0a0e14;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 2rem;
  font-weight: 700;
}

.section-title .accent {
  color: var(--text-muted);
  font-weight: 500;
  display: block;
  margin-top: 0.25rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 1rem;
}

.about-text p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  max-width: 540px;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.about-image-placeholder {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}

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

.service-icon {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.service-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Skills */
.skills-list {
  max-width: 700px;
  margin-bottom: 1rem;
}

.skill-item {
  margin-bottom: 1.25rem;
}

.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.skill-bar {
  height: 8px;
  background: var(--bg-card);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #79b8ff);
  border-radius: 4px;
  width: 0;
  transition: width 1s ease-out;
}

.skill-item.visible .skill-fill {
  width: var(--pct, 0%);
}

/* Portfolio */
.portfolio-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.portfolio-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

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

.portfolio-card.hide {
  display: none;
}

.card-image {
  height: 180px;
  overflow: hidden;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.portfolio-secondary-card .card-image {
  height: 160px;
}

.portfolio-secondary-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portfolio-card .card-category {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 1rem 1rem 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.portfolio-card h3 {
  font-size: 1.1rem;
  margin: 0 1rem 0.5rem;
}

.portfolio-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 1rem 1rem;
  line-height: 1.5;
}

.portfolio-card p strong {
  color: var(--text);
}

.card-links {
  display: flex;
  gap: 1rem;
  padding: 0 1rem 1rem;
  flex-wrap: wrap;
}

.card-links a {
  font-size: 0.85rem;
}

/* Portfolio secondary */
.portfolio-secondary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.portfolio-secondary-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

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

.portfolio-secondary-card .card-image {
  height: 160px;
}

.portfolio-secondary-card h3 {
  font-size: 1.1rem;
  margin: 1rem 1rem 0.5rem;
}

.portfolio-secondary-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 1rem 1rem;
}

.card-link {
  display: inline-block;
  margin: 0 1rem 1rem;
  font-size: 0.9rem;
}

/* Contact */
.contact-subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
  margin-bottom: 1rem;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.contact-form h3,
.contact-info h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 1rem;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-muted);
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-item i {
  color: var(--accent);
  margin-top: 0.25rem;
  width: 1.25rem;
  text-align: center;
}

.contact-item h6 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--text);
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.footer {
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-dark);
}

.footer p {
  font-size: 0.9rem;
  color: var(--text-muted);
}