@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-color: #F5F5F7;
  --card-bg: #FFFFFF;
  --text-primary: #1D1D1F;
  --text-secondary: #86868B;
  --accent: #0066CC;
  --accent-hover: #0077ED;
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
  --nav-bg: rgba(255, 255, 255, 0.72);
  --border-color: rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Floating Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.navbar ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.navbar a {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity 0.2s;
}

.navbar a:hover {
  opacity: 0.7;
}

@media (max-width: 768px) {
  .navbar ul {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2.5rem;
  text-align: center;
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 650px;
  margin: 0 auto 2rem auto;
}

/* Layout */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 6rem 0;
}

/* Hero Section */
.hero {
  padding: 8rem 0 4rem 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.social-links a {
  padding: 0.6rem 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  color: var(--text-primary);
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(0,0,0,0.02);
  transition: all 0.2s ease;
}

.social-links a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.social-links a.primary-btn {
  background: var(--accent);
  color: #fff;
  border: none;
}

.social-links a.primary-btn:hover {
  background: var(--accent-hover);
}

/* Project Row / Cards */
.project-row {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text-primary);
  text-decoration: none;
  border: 1px solid var(--border-color);
  scroll-margin-top: 100px;
}

.project-card:target, .project-card:focus {
  outline: none;
}

a.project-card:hover {
  transform: scale(1.015);
  box-shadow: var(--card-shadow-hover);
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .project-card {
    flex-direction: row;
    align-items: center;
  }
  .project-card:nth-child(even) {
    flex-direction: row-reverse;
  }
}

.project-image-wrapper {
  flex: 1;
  width: 100%;
  height: 350px;
  background-color: #FAFAFC;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-contain {
  object-fit: contain;
  padding: 2rem;
}

@media (min-width: 768px) {
  .project-image-wrapper {
    height: 420px;
    border-bottom: none;
    border-right: 1px solid var(--border-color);
  }
  .project-card:nth-child(even) .project-image-wrapper {
    border-right: none;
    border-left: 1px solid var(--border-color);
  }
}

@media (max-width: 767px) {
  .project-image-wrapper:has(iframe), 
  .project-image-wrapper:has(video) {
    height: auto;
    aspect-ratio: 16 / 9;
  }
}

.project-content {
  flex: 1;
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-content h3 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.project-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

/* Card Actions */
.card-link-text {
  font-weight: 500;
  color: var(--accent);
  margin-top: auto;
  align-self: flex-start;
}
a.project-card:hover .card-link-text {
  text-decoration: underline;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
  align-self: flex-start;
}

.btn:hover {
  background: #EBEBEF;
}

/* Career Section */
.career-card {
  background: var(--card-bg);
  border-radius: 18px;
  padding: 3rem;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
  text-align: center;
}

.career-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .career-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.career-grid img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border: 1px solid var(--border-color);
}

/* Mini Cards for Open Source / Others */
.mini-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.mini-card {
  display: block;
  background: var(--card-bg);
  border-radius: 14px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  color: var(--text-primary);
  text-decoration: none;
  scroll-margin-top: 100px;
}

.mini-card:target, .mini-card:focus {
  outline: none;
}

.mini-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  text-decoration: none;
  color: var(--text-primary);
}

.mini-card h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

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

footer {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}