/* ==========================================================================
   Base Styles & Design Tokens
   ========================================================================== */
:root {
  --bg-dark: #0b0f17;
  --bg-card: #131b2e;
  --bg-alt: #0e1526;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;

  --blue-primary: #3b82f6;
  --blue-hover: #2563eb;

  --orange-primary: #f97316;
  --orange-hover: #ea580c;

  --border-color: rgba(255, 255, 255, 0.08);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;

  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
}

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

.text-blue { color: var(--blue-primary); }
.text-orange { color: var(--orange-primary); }

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 0;
  transition: var(--transition);
}

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

.nav-logo {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--blue-primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
}

.nav-btn:hover {
  background-color: var(--blue-primary);
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  position: relative;
  transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition);
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 10rem 0 6rem 0;
  display: flex;
  align-items: center;
  min-height: 90vh;
}

.hero-container {
  text-align: center;
  max-width: 850px;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 50px;
  background-color: rgba(249, 115, 22, 0.1);
  color: var(--orange-primary);
  border: 1px solid rgba(249, 115, 22, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.5rem auto;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
}

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

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

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

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

.hero-tech-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.tech-pill {
  padding: 0.35rem 0.85rem;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  font-size: 0.825rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section-header {
  margin-bottom: 3.5rem;
  text-align: center;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-line {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-primary), var(--orange-primary));
  margin: 0 auto;
  border-radius: 2px;
}

/* ==========================================================================
   About / Philosophy
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.about-card {
  background-color: var(--bg-card);
  padding: 2.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.about-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-4px);
}

.about-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

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

/* ==========================================================================
   Capabilities
   ========================================================================== */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.capability-box {
  background-color: var(--bg-card);
  padding: 2.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.capability-box h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--blue-primary);
}

.capability-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.capability-list {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.capability-list li {
  font-size: 0.875rem;
  color: var(--text-main);
  padding: 0.35rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.capability-list li::before {
  content: '▹';
  color: var(--orange-primary);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--bg-card);
  padding: 2.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.project-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--orange-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.project-title {
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
  font-weight: 600;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* ==========================================================================
   Experience Timeline
   ========================================================================== */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--blue-primary);
  transform: translateX(-50%);
  border: 3px solid var(--bg-alt);
}

.timeline-content {
  background-color: var(--bg-card);
  padding: 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.timeline-date {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--orange-primary);
}

.timeline-role {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0.25rem 0;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.timeline-content p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* ==========================================================================
   Contact & Footer
   ========================================================================== */
.contact-container {
  max-width: 800px;
}

.contact-box {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  border: 1px solid var(--border-color);
}

.contact-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.contact-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

.contact-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  background-color: var(--bg-dark);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

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

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
  .hero-title { font-size: 2.5rem; }
  .hero-subtitle { font-size: 1.25rem; }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--bg-dark);
    flex-direction: column;
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-150%);
    transition: var(--transition);
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-toggle { display: block; }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}