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

:root {
  --bg: #0f0f13;
  --bg-alt: #18181d;
  --surface: #1e1e24;
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --border: #27272a;
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(15, 15, 19, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

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

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-content {
  max-width: 720px;
}

.hero-greeting {
  font-size: 1.125rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

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

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

/* Sections */
.section {
  padding: 100px 0;
}

.section-alt {
  background-color: var(--bg-alt);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

/* About */
.about-text p {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  max-width: 720px;
}

.about-stats {
  display: flex;
  gap: 48px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background-color: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.1);
}

.project-image {
  aspect-ratio: 16 / 9;
  background-color: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-placeholder {
  font-size: 3rem;
  font-weight: 800;
  color: var(--border);
  letter-spacing: -0.03em;
}

.project-info {
  padding: 24px;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.project-description {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.project-tags span {
  padding: 4px 12px;
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--accent);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 16px;
}

.project-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}

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

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}

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

.skill-category h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--accent);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  padding: 6px 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.skill-category li::before {
  content: '▹';
  color: var(--accent);
  margin-right: 8px;
}

/* Experience Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -26px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 3px solid var(--bg);
}

.timeline-content {
  background-color: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
}

.timeline-header {
  margin-bottom: 12px;
}

.timeline-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-company {
  font-size: 0.9375rem;
  color: var(--accent);
  font-weight: 500;
}

.timeline-date {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.timeline-content p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* Contact */
.contact-intro {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 480px;
}

.contact-form {
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: border-color var(--transition);
  outline: none;
}

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

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

.contact-links {
  display: flex;
  gap: 24px;
  margin-top: 40px;
}

.contact-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition);
}

.contact-link:hover {
  color: var(--accent);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.footer-content {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 16px 24px;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  z-index: 200;
  animation: slideIn 0.3s ease;
}

.toast.success {
  background-color: #22c55e;
  color: #fff;
}

.toast.error {
  background-color: #ef4444;
  color: #fff;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-toggle {
    display: flex;
  }

  .section {
    padding: 64px 0;
  }

  .about-stats {
    gap: 24px;
  }

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

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

@media (max-width: 480px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}