:root {
  --primary-color: #6366f1;
  --secondary-color: #a855f7;
  --bg-color: #f8fafc;
  --text-color: #1e293b;
  --card-bg: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --glow-color: rgba(99, 102, 241, 0.4);
  --nav-bg: #ffffff;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --card-bg: #1e293b;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --nav-bg: #1e293b;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  background-color: var(--nav-bg);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--shadow-color);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 20px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.3s;
}

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

/* Hero Section */
.hero {
  text-align: center;
  padding: 80px 0;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.8;
}

/* Tool Section */
.tool-section {
  background: var(--card-bg);
  padding: 40px;
  border-radius: 24px;
  box-shadow: 0 20px 25px -5px var(--shadow-color);
  text-align: center;
  margin-bottom: 60px;
}

.glow-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: 16px 32px;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 20px var(--glow-color);
}

.glow-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--glow-color);
}

/* Article Grid */
.featured-articles {
  margin-bottom: 80px;
}

.featured-articles h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.article-card {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 10px 15px -3px var(--shadow-color);
  transition: transform 0.3s;
}

.article-card:hover {
  transform: translateY(-10px);
}

.article-card h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
}

.read-more {
  display: inline-block;
  margin-top: 20px;
  color: var(--secondary-color);
  text-decoration: none;
  font-weight: 600;
}

/* Inquiry Section */
.inquiry-section {
  background: var(--card-bg);
  padding: 60px;
  border-radius: 24px;
  margin-bottom: 60px;
}

.inquiry-form {
  max-width: 600px;
  margin: 40px auto 0;
  display: grid;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
}

input, textarea {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--shadow-color);
  background: var(--bg-color);
  color: var(--text-color);
}

.submit-button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

/* Footer */
.main-footer {
  text-align: center;
  padding: 60px 0;
  border-top: 1px solid var(--shadow-color);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 20px;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-color);
  opacity: 0.7;
}

/* Theme Toggle */
.theme-toggle button {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .nav-links { display: none; }
}