:root {
  /* Primary Colors */
  --bg-dark: #0a1628;
  --bg-dark-secondary: #111f35;
  --bg-card: #1a2f4d;

  /* Accent Colors */
  --accent-primary: #dc2626;   /* Crimson - CTA & primary accents */
  --accent-secondary: #16a34a; /* Forest green - secondary accents */
  --accent-blue: #1e40af;      /* Dark blue - emphasis */

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #e0e7ff;
  --text-muted: #a5b4fc;

  /* Utilities */
  --border-color: #1e3a5f;
  --transition: all 0.3s ease;
}

/* ==================== RESET & TYPOGRAPHY ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: 'Geist', inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ==================== NAVBAR ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  padding: 1.5rem 2rem;
  transition: var(--transition);
}

.navbar-sticky {
  background: rgba(10, 14, 39, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
}

.navbar-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
}

.navbar-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  width: 0%;
  transition: width 0.1s linear;
}

/* ==================== HERO SECTION ==================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.15) 0%, rgba(22, 163, 74, 0.1) 100%);
  position: relative;
  transition: opacity 0.3s ease;
}

.hero-content {
  text-align: center;
  max-width: 900px;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  line-height: 1.8;
}

.accent-cyan {
  color: var(--accent-primary);
  font-weight: 700;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ==================== BUTTONS ==================== */
.btn {
  padding: 0.9rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 4px;
  transition: var(--transition);
  display: inline-block;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
  background: #b91c1c;
  box-shadow: 0 8px 20px rgba(220, 38, 38, 0.5);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn-large {
  padding: 1.2rem 3rem;
  font-size: 1.15rem;
}

.success {
  color: var(--accent-secondary);
}

/* ==================== SECTIONS ==================== */
.section {
  max-width: 1200px;
  margin: 5rem auto;
  padding: 0 2rem;
}

.section-header {
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ==================== ABOUT SECTION ==================== */
.about-section {
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.1) 0%, rgba(22, 163, 74, 0.05) 100%);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 4rem 2rem;
  margin: 6rem auto;
}

.about-content {
  max-width: 850px;
  margin: 0 auto;
  text-align: center;
}

.about-text {
  font-size: 1.3rem;
  line-height: 1.9;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
  font-weight: 500;
}

.about-philosophy {
  font-size: 1.15rem;
  color: var(--accent-primary);
  font-style: italic;
  font-weight: 700;
  margin-top: 2rem;
}

.remote-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-primary) 0%, #b91c1c 100%);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 20px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
  animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(220, 38, 38, 0.5);
  }
}

/* ==================== PROJECT CARD ==================== */
.project-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-left: 5px solid var(--accent-primary);
  border-radius: 6px;
  padding: 2.5rem;
  transition: var(--transition);
  margin-bottom: 2rem;
}

.project-card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 8px 24px rgba(220, 38, 38, 0.15);
  transform: translateY(-4px);
}

.project-header {
  margin-bottom: 2rem;
}

.project-icon {
  font-size: 1.5rem;
  margin-right: 0.5rem;
}

.project-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.project-tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.project-content {
  margin-bottom: 2rem;
}

.project-description {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.project-highlights {
  list-style: none;
  margin: 1rem 0;
}

.project-highlights li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.project-highlights li::before {
  content: '✓ ';
  color: var(--accent-secondary);
  font-weight: 700;
  margin-right: 0.5rem;
}

.tech-stack {
  margin-top: 2rem;
}

.tech-stack h4 {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tech-badge {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid;
  transition: var(--transition);
}

.tech-badge.backend {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(220, 38, 38, 0.1);
}

.tech-badge.backend:hover {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 0 15px rgba(220, 38, 38, 0.4);
}

.tech-badge.frontend {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(30, 64, 175, 0.1);
}

.tech-badge.frontend:hover {
  background: var(--accent-blue);
  color: white;
  box-shadow: 0 0 15px rgba(30, 64, 175, 0.4);
}

.tech-badge.devops {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
  background: rgba(22, 163, 74, 0.1);
}

.tech-badge.devops:hover {
  background: var(--accent-secondary);
  color: white;
  box-shadow: 0 0 15px rgba(22, 163, 74, 0.4);
}

.project-links {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.link-with-arrow {
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 4px;
  transition: var(--transition);
  border: 2px solid var(--text-secondary);
}

.link-with-arrow:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(30, 64, 175, 0.1);
}

.link-with-arrow.accent-cyan {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  font-size: 1.05rem;
  padding: 0.85rem 1.8rem;
}

.link-with-arrow.accent-cyan:hover {
  background: #b91c1c;
  border-color: #b91c1c;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
}

.arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.link-with-arrow:hover .arrow {
  transform: translateX(4px);
}

/* ==================== SKILLS SECTION ==================== */
.skill-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--border-color);
}

.tab-button {
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  border: none;
  border-bottom: 3px solid transparent;
  background: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.tab-button.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

.tab-button:hover:not(.active) {
  color: var(--text-primary);
}

.skills-content {
  display: grid;
  gap: 2rem;
}

.skill-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-blue);
  padding: 1.5rem;
  border-radius: 2px;
  transition: var(--transition);
}

.skill-item:hover {
  border-left-color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.skill-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.skill-header h4 {
  font-size: 1.05rem;
  font-weight: 700;
}

.level-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-secondary);
  background: rgba(22, 163, 74, 0.15);
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  border: 1px solid var(--accent-secondary);
}

.skill-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.skill-item .progress-bar {
  height: 4px;
  border-radius: 2px;
  background: var(--accent-blue);
  transition: var(--transition);
}

/* ==================== EXPERIENCE SECTION ==================== */
.cv-download-section {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
  margin-bottom: 3rem;
}

.download-container {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.experience-list {
  display: grid;
  gap: 1.5rem;
}

.experience-item {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  transition: var(--transition);
}

.experience-header {
  width: 100%;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  background: transparent;
  border: none;
  text-align: left;
  transition: var(--transition);
  border-left: 4px solid var(--border-color);
}

.experience-item.expanded .experience-header {
  border-left-color: var(--accent-primary);
  background: rgba(220, 38, 38, 0.08);
}

.experience-header:hover {
  border-left-color: var(--accent-blue);
}

.experience-title {
  flex: 1;
}

.experience-title h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.company {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.experience-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.period {
  font-weight: 600;
}

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

.toggle-icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  transition: transform 0.3s ease;
  color: var(--accent-blue);
}

.experience-item.expanded .toggle-icon {
  transform: rotate(90deg);
}

.experience-details {
  padding: 1.5rem 1.5rem 1.5rem 3rem;
  border-top: 1px solid var(--border-color);
  background: rgba(0, 240, 255, 0.03);
}

.experience-description {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.achievements {
  list-style: none;
  margin: 1rem 0;
}

.achievements li {
  padding: 0.4rem 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.achievements li::before {
  content: '✓ ';
  color: var(--accent-secondary);
  font-weight: 700;
  margin-right: 0.5rem;
}

.tech-used {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ==================== CONTACT SECTION ==================== */
.contact-container {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-left: 4px solid var(--accent-secondary);
  padding: 3rem;
  border-radius: 6px;
  text-align: center;
}

.contact-message {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.contact-container .btn {
  margin-bottom: 2rem;
}

.social-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.social-link {
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  padding-bottom: 0.25rem;
  transition: var(--transition);
}

.social-link:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

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

/* ==================== FOOTER ==================== */
.footer {
  background: var(--bg-dark-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  margin-top: 5rem;
  font-size: 0.9rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .navbar-content {
    flex-direction: column;
    gap: 1rem;
  }

  .navbar-links {
    gap: 1rem;
  }

  .nav-link {
    font-size: 0.8rem;
  }

  .hero-title {
    font-size: clamp(2rem, 6vw, 3rem);
  }

  .section {
    padding: 0 1rem;
  }

  .project-card,
  .contact-container,
  .cv-download-section {
    padding: 1.5rem;
  }

  .experience-meta {
    flex-direction: column;
    align-items: flex-start;
    font-size: 0.8rem;
  }

  .experience-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

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

  .btn {
    width: 100%;
    text-align: center;
  }

  .project-links {
    flex-direction: column;
    gap: 1rem;
  }

  .social-links {
    gap: 1rem;
  }

  .skill-tabs {
    flex-wrap: wrap;
  }

  .download-container {
    flex-direction: column;
  }

  .download-container .btn {
    width: 100%;
  }

  .about-section {
    padding: 2rem 1.5rem;
    margin: 4rem auto;
  }

  .about-text {
    font-size: 1.1rem;
  }

  .about-philosophy {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 1rem;
  }

  .nav-link {
    display: none;
  }

  .section {
    margin: 3rem auto;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
  }

  .tech-badges {
    gap: 0.5rem;
  }

  .tech-badge {
    padding: 0.3rem 0.7rem;
    font-size: 0.75rem;
  }

  .contact-container {
    padding: 1.5rem;
  }
}