/* ===== CSS Variables ===== */
:root {
  --color-bg: #0f1117;
  --color-bg-secondary: #161822;
  --color-bg-card: #1c1f2e;
  --color-bg-card-hover: #242840;
  --color-primary: #6c63ff;
  --color-primary-light: #8b85ff;
  --color-accent: #00d4aa;
  --color-text: #e2e4ed;
  --color-text-muted: #9196ab;
  --color-text-heading: #ffffff;
  --color-border: #2a2d3e;
  --color-tag-bg: rgba(108, 99, 255, 0.15);
  --color-tag-text: #a5a0ff;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
  color: var(--color-text-heading);
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }

.section-title {
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
  font-size: 1.05rem;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text-heading);
  letter-spacing: -0.5px;
}

.nav-logo span {
  color: var(--color-primary);
}

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

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding: 0.25rem 0;
}

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

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

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

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

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

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 70px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108, 99, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-greeting {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 1rem;
  margin-bottom: 1rem;
  display: block;
}

.hero h1 {
  margin-bottom: 1.25rem;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.3);
}

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

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

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.85rem;
}

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

.about-text p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.skill-category h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-primary-light);
  margin-bottom: 0.75rem;
}

.skill-category ul li {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  padding: 0.25rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category ul li::before {
  content: '▹';
  color: var(--color-accent);
  font-size: 0.75rem;
}

/* ===== Projects Section ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.project-icon {
  font-size: 1.5rem;
  color: var(--color-primary);
}

.project-links {
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

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

.project-card h3 {
  margin-bottom: 0.75rem;
}

.project-card h3 a {
  color: var(--color-text-heading);
}

.project-card h3 a:hover {
  color: var(--color-primary-light);
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1.25rem;
}

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

.project-tags span {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ===== Blog Section ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.blog-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}

.blog-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card-content {
  padding: 1.75rem;
}

.blog-card-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.blog-card-meta .date {
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.blog-card-meta .tag {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.15rem 0.6rem;
  border-radius: 50px;
}

.blog-card h3 {
  margin-bottom: 0.75rem;
  transition: color var(--transition);
}

.blog-card:hover h3 {
  color: var(--color-primary-light);
}

.blog-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.blog-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1rem;
  color: var(--color-primary-light);
  font-size: 0.9rem;
  font-weight: 500;
}

.blog-card:hover .read-more {
  color: var(--color-accent);
}

/* Blog Post Overlay */
.blog-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  justify-content: center;
  align-items: flex-start;
  padding: 2rem;
  overflow-y: auto;
}

.blog-overlay.active {
  display: flex;
}

.blog-post-full {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  max-width: 800px;
  width: 100%;
  margin: 2rem auto;
  padding: 3rem;
  position: relative;
}

.blog-post-full .close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition);
  line-height: 1;
}

.blog-post-full .close-btn:hover {
  color: var(--color-text-heading);
}

.blog-post-full h2 {
  margin-bottom: 0.75rem;
}

.blog-post-full .post-meta {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-post-full .post-body {
  line-height: 1.8;
  color: var(--color-text);
}

.blog-post-full .post-body p {
  margin-bottom: 1.25rem;
}

.blog-post-full .post-body h3 {
  margin: 2rem 0 1rem;
}

.blog-post-full .post-body code {
  background: var(--color-bg-card);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--color-accent);
}

.blog-post-full .post-body pre {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.blog-post-full .post-body pre code {
  background: none;
  padding: 0;
}

.blog-post-full .post-body ul,
.blog-post-full .post-body ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.blog-post-full .post-body li {
  margin-bottom: 0.5rem;
  list-style: disc;
  color: var(--color-text-muted);
}

/* ===== Resume Section ===== */
.resume-section {
  background: var(--color-bg-secondary);
}

.resume-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.resume-container > p {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.resume-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.resume-highlights .highlight-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  text-align: center;
}

.highlight-item .icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.highlight-item h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.highlight-item p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.resume-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

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

.contact-content > p {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
  transform: translateY(-2px);
}

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

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--color-text-muted);
}

.footer a:hover {
  color: var(--color-primary-light);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 2rem;
    gap: 1.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog-post-full {
    padding: 1.5rem;
    margin: 1rem;
  }

  section {
    padding: 3.5rem 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

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

  .resume-highlights {
    grid-template-columns: 1fr;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}