/* style.css */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

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

/* Header & Navigation */
header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
}

.nav-links a {
  margin-left: 20px;
  color: var(--text-main);
  font-weight: 500;
}

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

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 20px;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 36px;
  margin-bottom: 10px;
}

.hero p {
  color: var(--text-muted);
  font-size: 18px;
  margin-bottom: 30px;
}

/* Search Bar */
.search-bar {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.search-bar input {
  width: 100%;
  padding: 15px 20px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: 30px;
  outline: none;
  transition: border-color 0.3s;
}

.search-bar input:focus {
  border-color: var(--primary-color);
}

/* Main Content & Grid */
main {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--text-main);
}

/* Categories Row */
.categories {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.category-btn {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-main);
  transition: all 0.2s;
}

.category-btn.active, .category-btn:hover {
  background-color: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

/* Tool Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 50px;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.tool-icon {
  font-size: 32px;
  margin-bottom: 15px;
}

.tool-title {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-main);
}

.tool-desc {
  font-size: 14px;
  color: var(--text-muted);
  flex-grow: 1;
}

/* Footer */
footer {
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 40px 20px;
  text-align: center;
  margin-top: 60px;
}

.footer-links {
  margin: 15px 0;
}

.footer-links a {
  margin: 0 10px;
  color: var(--text-muted);
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .nav-links { display: none; /* We will add a mobile menu later if needed */ }
}