/* Modern Light Theme IT Portfolio - Simplified */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --accent-color: #0284c7;
  --accent-hover: #0369a1;
  --header-height: 80px;
  --container-width: 1200px;
  --border-radius: 12px;
  --transition: all 0.2s ease;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-secondary); /* Light gray background for contrast with white cards */
  color: var(--text-primary);
  line-height: 1.5;
}

/* Typography */
h1 {
  font-size: 2.5rem;
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

p {
  color: var(--text-secondary);
  font-size: 1rem;
}

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

/* Layout */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95); /* More opaque */
  backdrop-filter: blur(8px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
}

header .container {
    display: flex; /* Ensure flex behavior inside header container */
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

nav {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.cta-button {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  background: var(--accent-color);
  color: #ffffff;
  border-radius: 6px; /* Slightly squarer for professional look */
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

.cta-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Filter Section */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid rgba(0,0,0,0.1);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.filter-btn.active {
    background: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); /* Better responsiveness */
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: all 0.4s ease; /* Smooth transition for filtering */
  border: 1px solid rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-hover-shadow);
  border-color: rgba(2, 132, 199, 0.2);
}

/* Image Placeholder & Overlay */
.project-image-placeholder {
  height: 180px;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid rgba(0,0,0,0.03);
  position: relative; /* For overlay positioning */
  overflow: hidden;
}

.project-image-placeholder i {
    font-size: 3.5rem;
    color: var(--accent-color);
    opacity: 0.9;
    transition: var(--transition);
}

.project-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    transition: transform 0.4s ease;
}

/* Hover Effect: Overlay */
.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(2, 132, 199, 0.9); /* Accent color with opacity */
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    backdrop-filter: blur(2px);
    z-index: 10;
}

.project-card:hover .card-overlay {
    opacity: 1;
}

.project-card:hover .project-image-placeholder i {
    transform: scale(1.1);
    opacity: 0; /* Hide icon when overlay appears */
}

.project-card:hover .project-image-placeholder img {
    transform: scale(1.05); /* Slight zoom for image on hover */
}

.view-btn {
    color: #ffffff;
    border: 1px solid #ffffff;
    padding: 0.6rem 1.5rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.project-card:hover .view-btn {
    transform: translateY(0);
}

.view-btn:hover {
    background: #ffffff;
    color: var(--accent-color);
}

.project-content {
  padding: 1.5rem;
  flex-grow: 1; /* Pushes content effectively */
}

.project-tags {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.project-tag {
  font-size: 0.75rem;
  color: var(--accent-color);
  background: rgba(2, 132, 199, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-weight: 500;
}

/* Tech Stack Section */
.tech-stack {
  text-align: center;
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(0,0,0,0.05); /* Subtle separation */
}

.tech-stack h3 {
    color: var(--text-secondary);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.tech-icons {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  opacity: 0.6;
}

.tech-icon {
  font-size: 2.5rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.tech-icon:hover {
  color: var(--accent-color);
  transform: translateY(-3px);
  opacity: 1;
}

/* Footer */
footer {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 2rem 0;
  border-top: 1px solid rgba(0,0,0,0.05);
}

/* Responsive */
@media (max-width: 600px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}