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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-hover: #1c2333;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
  --font-sans: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
}

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

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

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s;
}

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

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Sections */
section {
  padding: 100px 0 80px;
  min-height: 100vh;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 48px;
}

.cursor {
  animation: blink 1s step-end infinite;
}

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

/* Hero */
#hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  padding-top: 64px;
  position: relative;
}

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

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 8px;
}

.hero-text h1 {
  font-size: 3rem;
  line-height: 1.1;
  margin-bottom: 8px;
}

.hero-text h1 span {
  color: var(--accent);
}

.hero-title {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--green);
  margin-bottom: 20px;
  min-height: 1.6rem;
}

.hero-bio {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
}

.btn {
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  display: inline-block;
}

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

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

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

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

.hero-socials {
  display: flex;
  gap: 20px;
}

.hero-socials a {
  color: var(--text-muted);
  font-size: 1.4rem;
  transition: color 0.2s, transform 0.2s;
}

.hero-socials a:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

/* Code Window */
.code-window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.code-header {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--orange); }
.dot.green { background: var(--green); }

.code-window pre {
  padding: 20px;
  overflow-x: auto;
}

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

.code-window .kw { color: #ff7b72; }
.code-window .var { color: #79c0ff; }
.code-window .key { color: #ffa657; }
.code-window .str { color: #a5d6ff; }
.code-window .fn { color: #d2a8ff; }

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  animation: bounce 2s infinite;
}

.scroll-indicator i {
  font-size: 0.8rem;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* About */
#about {
  background: var(--surface);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: transform 0.2s, border-color 0.2s;
}

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

.about-card i {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

.skill-category h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--accent);
}

.skill-category h3 i {
  margin-right: 8px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tags span {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  border: 1px solid rgba(88, 166, 255, 0.15);
}

/* Projects */
#projects {
  background: var(--surface);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}

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

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.project-header i {
  font-size: 1.8rem;
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: color 0.2s;
}

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

.project-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.project-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}

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

.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  background: rgba(63, 185, 80, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
}

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

.contact-intro {
  grid-column: 1 / -1;
  color: var(--text-muted);
  font-size: 1rem;
  text-align: center;
  margin-bottom: 16px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group textarea {
  resize: vertical;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-info i {
  color: var(--accent);
  width: 20px;
  text-align: center;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer i {
  color: var(--red);
}

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

  .hero-text h1 {
    font-size: 2.2rem;
  }

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

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

  .code-window {
    font-size: 0.7rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .hamburger {
    display: flex;
  }

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

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 24px;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s;
  z-index: 2000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.error {
  color: var(--red);
}