:root {
  --bg-color: #f4f7f6;
  --text-color: #1a1a1a;
  --card-bg: rgba(255, 255, 255, 0.7);
  --primary-color: #4f46e5;
  --secondary-color: #818cf8;
  --nav-bg: rgba(255, 255, 255, 0.9);
  --footer-bg: #111827;
  --footer-text: #9ca3af;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --card-bg: rgba(30, 41, 59, 0.7);
  --primary-color: #6366f1;
  --secondary-color: #4f46e5;
  --nav-bg: rgba(15, 23, 42, 0.9);
  --footer-bg: #030712;
  --footer-text: #6b7280;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-color); line-height: 1.6; display: flex; flex-direction: column; min-height: 100vh; }
header { background-color: var(--nav-bg); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; box-shadow: var(--shadow); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); text-decoration: none; display: flex; align-items: center; gap: 0.5rem; }
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-color); font-weight: 500; transition: var(--transition); }
.nav-links a:hover { color: var(--primary-color); }
.theme-toggle { background: none; border: none; color: var(--text-color); font-size: 1.2rem; cursor: pointer; padding: 0.5rem; border-radius: 50%; transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.theme-toggle:hover { background-color: var(--card-bg); }
main { flex: 1; max-width: 1200px; margin: 2rem auto; padding: 0 2rem; width: 100%; }
h1 { font-size: 2.5rem; margin-bottom: 0.5rem; text-align: center; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.subtitle { text-align: center; margin-bottom: 3rem; color: var(--text-color); opacity: 0.8; }
.hero { text-align: center; padding: 4rem 0; }
.category { margin-bottom: 3rem; }
.category h2 { font-size: 1.8rem; margin-bottom: 1.5rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--card-bg); display: inline-block; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.5rem; }
.tool-card { background-color: var(--card-bg); backdrop-filter: blur(10px); border: 1px solid rgba(255, 255, 255, 0.1); padding: 1.5rem; border-radius: var(--border-radius); text-decoration: none; color: var(--text-color); transition: var(--transition); box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 0.5rem; }
.tool-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); border-color: var(--primary-color); }
.tool-card h3 { font-size: 1.1rem; color: var(--primary-color); }
.tool-card p { font-size: 0.9rem; opacity: 0.8; }
footer { background-color: var(--footer-bg); color: var(--footer-text); padding: 4rem 2rem 2rem; margin-top: 4rem; }
.footer-content { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.footer-section h4 { color: #fff; font-size: 1.2rem; margin-bottom: 1rem; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { color: var(--footer-text); text-decoration: none; transition: var(--transition); display: inline-block; }
.footer-links a:hover { color: var(--primary-color); transform: translateX(5px); }
.social-icons { display: flex; gap: 1rem; margin-top: 1rem; }
.social-icon { width: 40px; height: 40px; border-radius: 50%; background-color: rgba(255, 255, 255, 0.1); display: flex; align-items: center; justify-content: center; color: #fff; text-decoration: none; transition: var(--transition); }
.social-icon:hover { background-color: var(--primary-color); transform: translateY(-3px); }
.footer-bottom { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid rgba(255, 255, 255, 0.1); }
.adsense-container { margin: 2rem 0; padding: 1rem; background: var(--card-bg); border-radius: var(--border-radius); text-align: center; min-height: 100px; display: flex; align-items: center; justify-content: center; border: 1px dashed var(--primary-color); }
.tool-header { text-align: center; margin-bottom: 2rem; }
.tool-workspace { background: var(--card-bg); padding: 2rem; border-radius: var(--border-radius); box-shadow: var(--shadow); max-width: 800px; margin: 0 auto; }
.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; }
.input-group input, .input-group select, .input-group textarea { width: 100%; padding: 0.75rem; border: 1px solid rgba(128, 128, 128, 0.3); border-radius: 8px; background: var(--bg-color); color: var(--text-color); font-family: inherit; transition: var(--transition); }
.input-group input:focus, .input-group select:focus, .input-group textarea:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.2); }
.btn { background: var(--primary-color); color: white; border: none; padding: 0.75rem 1.5rem; border-radius: 8px; font-weight: 600; cursor: pointer; transition: var(--transition); display: inline-block; }
.btn:hover { background: var(--secondary-color); transform: translateY(-2px); }
.result-box { margin-top: 1.5rem; padding: 1rem; background: var(--bg-color); border-radius: 8px; border-left: 4px solid var(--primary-color); }
@media (max-width: 768px) { .nav-links { display: none; } }
.content-box { background: var(--card-bg); padding: 3rem; border-radius: var(--border-radius); box-shadow: var(--shadow); max-width: 800px; margin: 0 auto; }
.content-box h2 { color: var(--primary-color); margin-top: 1.5rem; margin-bottom: 1rem; }
.content-box p { margin-bottom: 1rem; }