:root {
  /* Core Colors - Clean Theme */
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #eff6ff;
  
  --secondary: #64748b;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  
  --bg: #f9fafb;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-focus: #3b82f6;
  
  --text: #111827;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  
  /* Layout */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --container-max: 1200px;
}

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

body {
  font-family: 'Roboto', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  color: var(--text);
}

.container-custom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.75rem 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text);
}

.logo-area img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.logo-area span {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.nav-menu {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 5rem 0;
  text-align: center;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
}

.hero-title {
  font-size: 3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Buttons */
.btn-primary {
  background-color: var(--primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: background-color 0.2s, transform 0.1s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-outline {
  background-color: transparent;
  color: var(--text);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  transition: background-color 0.2s, border-color 0.2s;
  cursor: pointer;
}

.btn-outline:hover {
  background-color: var(--bg);
  border-color: var(--text-light);
}

/* Cards */
.card-clean {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s;
}

.card-clean:hover {
  box-shadow: var(--shadow-md);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-header {
  margin-bottom: 3rem;
  text-align: center;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.section-desc {
  color: var(--text-muted);
}

/* Table */
.table-container {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

table.clean-table {
  width: 100%;
  border-collapse: collapse;
}

.clean-table th {
  background-color: #f8fafc;
  text-align: left;
  padding: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.clean-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

.clean-table tr:last-child td {
  border-bottom: none;
}

.clean-table tr:hover {
  background-color: #fcfcfc;
}

/* Footer */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  text-align: center;
  font-size: 0.875rem;
}

/* Filters */
.filters {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.input-clean {
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--text);
  font-size: 0.875rem;
  min-width: 200px;
}

.input-clean:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-menu {
    width: 100%;
    justify-content: center;
  }
}