/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #55aff9;
  --accent-hover: #7bc4fc;
  --accent-soft: rgba(85, 175, 249, 0.15);
  --border: #30363d;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.2s ease;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

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

/* Subtle gradient overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-soft), transparent);
  pointer-events: none;
  z-index: 0;
}

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

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

/* ===== Header & Navigation ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: inherit !important;
  display: inline-flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0;
  line-height: 1.2;
  text-decoration: none !important;
}

.logo-bracket {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
  font-size: 1.05em;
}

.logo-text {
  color: var(--text-primary);
  font-weight: 700;
  text-transform: lowercase;
  padding: 0 0.2em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

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

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

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

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 2rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.hero-content {
  flex: 1;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.6s ease forwards;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.1s forwards;
}

.hero-title .highlight {
  color: var(--accent);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.2s forwards;
}

.hero-description {
  max-width: 500px;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.3s forwards;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.4s forwards;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

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

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

/* Hero visual */
.hero-visual {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  height: 400px;
  pointer-events: none;
}

.hero-blob {
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  animation: pulse 8s ease-in-out infinite;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 20%, transparent 70%);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

/* ===== Section Styles ===== */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
  position: relative;
  z-index: 1;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
}

/* ===== About Section ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  max-width: 600px;
}

.about-logo {
  width: 280px;
  height: 280px;
  object-fit: contain;
  border-radius: var(--radius-lg);
}

/* ===== Skills Section ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}

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

.skill-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
}

.skill-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.skill-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== Projects Section ===== */
.projects-grid {
  display: grid;
  gap: 2rem;
}

.project-card {
  display: grid;
  grid-template-columns: minmax(260px, 300px) 1fr;
  gap: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  align-items: stretch;
}

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

.project-image {
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  min-height: 0;
  padding: 0;
}

.project-thumb {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  display: block;
  flex-shrink: 0;
}

.project-info {
  padding: 2rem;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.project-info h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.project-info > p {
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 6px;
}

.project-links {
  display: flex;
  gap: 1.5rem;
}

.project-links a {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* ===== Contact Section ===== */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

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

.contact-links {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1rem;
  max-width: 420px;
  margin: 0 auto;
}

.contact-row-social {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary) !important;
  font-weight: 500;
  transition: all var(--transition);
  text-decoration: none;
}

.contact-link:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  color: var(--accent) !important;
}

.contact-link--email {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.contact-link--icon {
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem 1rem;
}

.contact-link-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.contact-link-img--github {
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

.contact-link--icon:hover .contact-link-img--github {
  opacity: 1;
}

.contact-icon {
  font-size: 1.25rem;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

.footer-note {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  opacity: 0.7;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-visual {
    width: 60%;
    opacity: 0.5;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .about-image {
    order: -1;
    justify-self: start;
  }
  
  .project-card {
    grid-template-columns: 1fr;
  }

  .project-image {
    max-height: none;
  }

  .project-thumb {
    max-width: none;
    width: 100%;
    aspect-ratio: 1 / 1;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .hero {
    padding-top: 6rem;
  }
  
  .hero-visual {
    display: none;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    text-align: center;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}