:root {
  --bg-primary: #07070d;
  --bg-secondary: #0e0e1a;
  --bg-card: #15152a;
  --bg-card-hover: #1c1c38;
  --text-primary: #e8e8ed;
  --text-secondary: #a0a0b0;
  --text-muted: #6b6b7b;
  --accent: #0ea5e9;
  --accent-hover: #38bdf8;
  --accent-glow: rgba(14, 165, 233, 0.15);
  --border: #252540;
  --border-accent: #0ea5e9;
  --success: #10b981;
  --learning-bg: rgba(234, 179, 8, 0.12);
  --learning-text: #fbbf24;
  --design-bg: rgba(168, 85, 247, 0.12);
  --design-text: #c084fc;
  --private-bg: rgba(107, 107, 123, 0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-card: 0 2px 20px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

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

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

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

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

img {
  max-width: 100%;
  display: block;
}

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

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(7, 7, 13, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(7, 7, 13, 0.95);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.4);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-rotating-text {
  position: relative;
  display: inline-block;
  width: 240px;
  height: 28px;
  overflow: hidden;
  vertical-align: middle;
}

.nav-rotating-text span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  transform: translateY(12px);
  animation: rotateTitles 16s infinite;
}

.nav-rotating-text span:nth-child(1) { animation-delay: 0s; }
.nav-rotating-text span:nth-child(2) { animation-delay: 4s; }
.nav-rotating-text span:nth-child(3) { animation-delay: 8s; }
.nav-rotating-text span:nth-child(4) { animation-delay: 12s; }

@keyframes rotateTitles {
  0% { opacity: 0; transform: translateY(12px); }
  2% { opacity: 1; transform: translateY(0); }
  23% { opacity: 1; transform: translateY(0); }
  25% { opacity: 0; transform: translateY(-12px); }
  100% { opacity: 0; transform: translateY(-12px); }
}

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

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

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

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

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

.lang-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 7, 13, 0.95);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.mobile-nav-overlay.open {
  display: flex;
}

.mobile-nav-overlay a {
  font-size: 1.4rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.mobile-nav-overlay .lang-toggle {
  font-size: 1rem;
  padding: 10px 28px;
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image img {
  width: 100%;
  max-width: 420px;
  border-radius: 24px;
  border: 2px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  transition: var(--transition);
}

.hero-image img:hover {
  border-color: var(--accent);
  transform: scale(1.02);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.hero-badge i {
  color: var(--accent);
}

.hero-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 12px;
}

.hero-name span {
  color: var(--accent);
}

.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.3;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: inherit;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

.hero-cv {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-cv-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-cv .btn-outline {
  padding: 8px 18px;
  font-size: 0.82rem;
}

.hero-cv .btn-outline i {
  font-size: 0.85rem;
}

.hero-social {
  display: flex;
  gap: 16px;
  align-items: center;
}

.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: var(--transition);
}

.hero-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

/* About */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.7;
}

.about-text .highlight {
  color: var(--accent);
  font-weight: 600;
}

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

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.about-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.about-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.about-card-header i {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.9rem;
}

.about-card-header h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
}

.about-card p, .about-card li {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.about-card ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.about-card ul li {
  position: relative;
  padding-left: 16px;
}

.about-card ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.learning-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--learning-bg);
  color: var(--learning-text);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 50px;
  margin-left: 8px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.skill-category h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-category h3 i {
  color: var(--accent);
  font-size: 0.9rem;
  width: 24px;
  text-align: center;
}

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

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.skill-tag.core {
  background: var(--accent-glow);
  border-color: rgba(14, 165, 233, 0.3);
  color: var(--accent);
}

.skill-tag.learning {
  background: var(--learning-bg);
  border-color: rgba(234, 179, 8, 0.2);
  color: var(--learning-text);
}

.skill-tag.learning::after {
  content: 'Learning';
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(234, 179, 8, 0.15);
  margin-left: 4px;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.project-card.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(14, 165, 233, 0.06) 100%);
  border-color: rgba(14, 165, 233, 0.2);
}

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

.project-badges {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.project-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 4px;
}

.project-badge.private {
  background: var(--private-bg);
  color: var(--text-muted);
}

.project-badge.design {
  background: var(--design-bg);
  color: var(--design-text);
}

.project-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.project-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.project-tech span {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.project-links {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: auto;
}

.project-links a {
  font-size: 0.85rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.project-links .disabled {
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: default;
  opacity: 0.6;
}

.project-links .disabled i {
  color: var(--text-muted);
}

.project-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Certifications */
.certifications {
  background: var(--bg-secondary);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 700px;
  margin: 0 auto;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: var(--transition);
}

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

.cert-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 10px;
  color: var(--accent);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.cert-info h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.cert-info p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group label .required {
  color: var(--accent);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input.error {
  border-color: #ef4444;
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.form-submit:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-message {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-top: 12px;
  display: none;
}

.form-message.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success);
}

.form-message.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-info-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: var(--transition);
}

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

.contact-info-card i {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 8px;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-info-card a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-info-card a:hover {
  color: var(--accent);
}

.contact-info-card .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

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

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

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

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

.footer-social {
  display: flex;
  gap: 16px;
}

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

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

.footer-copy {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* 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);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 1024px) {
  .hero-name {
    font-size: 3.5rem;
  }

  .about-grid {
    gap: 40px;
  }

  .contact-grid {
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .hero-split {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-image img {
    max-width: 280px;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }

  .hero-name {
    font-size: 2.8rem;
  }

  .hero-title {
    font-size: 1.2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section-title {
    font-size: 2rem;
  }

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

  .project-card.featured {
    grid-column: 1;
  }

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

  .contact-form {
    padding: 24px;
  }

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

  .cert-item {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 64px 0;
  }

  .hero-name {
    font-size: 2.2rem;
    letter-spacing: -1px;
  }

  .hero-description {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .project-card {
    padding: 24px;
  }
}

@media (min-width: 1440px) {
  .hero-name {
    font-size: 5rem;
  }

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