:root {
  --color-bg: #f0f2f5;
  --color-white: #ffffff;
  --color-primary: #e74c3c;
  --color-secondary: #34495e;
  --color-light: #ffe6e1;
  --font-base: 'Montserrat', sans-serif;
  --transition: 0.3s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-secondary);
  line-height: 1.6;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(10px);
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: background var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-secondary);
}

nav a {
  margin: 0 1rem;
  color: var(--color-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}

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

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
}

/* Main Hero (Index) */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 2rem;
  max-width: 1200px;
  margin: 6rem auto 2rem;
  background: var(--color-white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.hero-image {
  background: var(--color-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  width: 70%;
  max-width: 280px;
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition);
}

.hero-image img:hover {
  transform: scale(1.05);
}

.hero-content {
  padding: 3rem;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 700;
}

.hero-content p {
  font-size: 1.125rem;
  line-height: 1.4;
}

.hero-content .btn {
  align-self: start;
  padding: 0.75rem 1.5rem;
  background: var(--color-white);
  color: var(--color-primary);
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: background var(--transition);
}

.hero-content .btn:hover {
  background: #f7f7f7;
}

/* Project Detail Pages */
.project-detail {
  max-width: 900px;
  margin: 8rem auto 4rem;
  padding: 0 1rem;
}

.hero-project {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-project img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  margin-bottom: 1rem;
}

.hero-project h1 {
  font-size: 2.5rem;
  color: var(--color-secondary);
}

.project-content h2 {
  margin-top: 1.5rem;
  color: var(--color-secondary);
}

.project-content p,
.project-content ul {
  margin: 1rem 0;
}

.project-content li {
  margin-left: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition);
}

.btn:hover {
  background: #c0392b;
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem auto;
  max-width: 1000px;
  padding: 0 1rem;
}

.skill-card {
  background: var(--color-white);
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  text-align: center;
  font-weight: 600;
  transition: transform 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-4px);
}

/* Code Blocks */
.code-container {
  background: #2d2d2d;
  border: 1px solid #444;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin-top: 1rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.95rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: #777;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-content {
    padding: 2rem;
  }
}