/* --- Design System & CSS Variables --- */
:root {
  --bg-primary: #030712;
  --bg-secondary: #0b0f19;
  --bg-tertiary: #111827;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  
  --accent-cyan: #38bdf8;
  --accent-purple: #818cf8;
  --accent-emerald: #34d399;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  
  --border-color: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.15);
  --glass-bg: rgba(3, 7, 18, 0.7);
  --glass-border: rgba(255, 255, 255, 0.06);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, monospace;
  
  --max-width: 1100px;
  --header-height: 70px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

/* --- Layout & Typography Spacing --- */
section {
  padding: 100px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 40px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  letter-spacing: -0.02em;
}

/* --- Sticky Glassmorphic Header --- */
#main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--glass-bg);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.02em;
}

.logo-icon {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease-out;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #030712;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.35);
}

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

.btn-secondary:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.03);
}

/* --- Hero Section --- */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + 40px);
}

.hero-content {
  max-width: 650px;
  z-index: 2;
}

.badge-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.badge {
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 20px;
  color: var(--accent-cyan);
}

.badge-pulse {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-emerald);
}

.badge-pulse::before {
  content: '';
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 8px var(--accent-emerald); }
  100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
  font-size: 4.5rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

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

.hero-glowing-blob {
  position: absolute;
  top: 50%;
  right: -5%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(129, 140, 248, 0.03) 70%, transparent 100%);
  filter: blur(40px);
  z-index: 1;
  pointer-events: none;
  animation: float-blob 8s ease-in-out infinite alternate;
}

@keyframes float-blob {
  from { transform: translate(0px, -50%) scale(1); }
  to { transform: translate(-30px, -45%) scale(1.1); }
}

/* --- About Section --- */
.about-section {
  border-top: 1px solid var(--border-color);
}

.about-content {
  max-width: 800px;
}

.lead-text {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 24px;
}

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

/* --- Projects Section --- */
.projects-section {
  border-top: 1px solid var(--border-color);
}

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

.project-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), 0 0 20px rgba(56, 189, 248, 0.05);
}

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

.tech-tag {
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-mono);
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--text-secondary);
}

.project-card-title {
  font-size: 1.4rem;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.project-card-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

/* --- Skills Section --- */
.skills-section {
  border-top: 1px solid var(--border-color);
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.skills-category {
  background-color: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
}

.category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

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

.skill-tag {
  font-size: 0.8rem;
  font-weight: 500;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.skill-tag:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background-color: rgba(56, 189, 248, 0.02);
}

/* --- Contact Section --- */
.contact-section {
  border-top: 1px solid var(--border-color);
  text-align: center;
  padding-bottom: 140px;
}

.contact-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px auto;
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
}

.contact-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px 32px;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.contact-icon {
  font-size: 2rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.contact-title {
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.contact-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.contact-card:hover .contact-value {
  color: var(--accent-cyan);
}

/* --- Footer --- */
#main-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 40px 24px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Media Queries --- */
@media (max-width: 768px) {
  .hero-title {
    font-size: 3.2rem;
  }
  .hero-subtitle {
    font-size: 1.4rem;
  }
  .nav-links {
    display: none; /* simple mobile fallback, hiding links or we could expand them */
  }
  section {
    padding: 60px 24px;
  }
}

/* --- Scroll entry reveals & Scroll effects (supported browsers) --- */
@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: view()) and (animation-range: entry)) {
    @keyframes reveal {
      from {
        opacity: 0;
        transform: translateY(40px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .scroll-reveal {
      animation: reveal auto linear backwards;
      animation-timeline: view();
      animation-range: entry 10% entry 40%;
    }
  }
}