:root {
  --bg: #0b0f19;
  --bg-card: #111827;
  --bg-secondary: #1f2937;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent: #00D4AA;
  --accent-hover: #00b894;
  --accent-secondary: #6366f1;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #22c55e;
  --border: #374151;
  --border-light: #1f2937;
  --input-bg: #1f2937;
  --gradient: linear-gradient(135deg, #00D4AA 0%, #6366f1 100%);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
.site-header {
  background: rgba(11, 15, 25, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.main-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.main-nav a:hover {
  color: var(--accent);
}

.nav-cta {
  background: var(--gradient);
  color: #fff !important;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
}

.nav-cta:hover {
  opacity: 0.9;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
  position: relative;
}

.hero h1 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  position: relative;
}

.hero-cta {
  display: inline-flex;
  gap: 1rem;
  position: relative;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 3rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 1.75rem;
  transition: all 0.2s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: rgba(0, 212, 170, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.card-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card-meta span {
  background: var(--bg-secondary);
  padding: 0.25rem 0.625rem;
  border-radius: 6px;
}

/* Tool Page */
.tool-page {
  padding: 3rem 0 5rem;
}

.tool-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.tool-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.tool-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.tool-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
  color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.9375rem;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group select {
  cursor: pointer;
}

.form-group select option {
  background: var(--bg-card);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.radio-group input[type="radio"] {
  accent-color: var(--accent);
}

.radio-group label:has(input:checked) {
  border-color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-light);
}

.checkbox-group:last-child {
  border-bottom: none;
}

.checkbox-group input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  margin-top: 2px;
  cursor: pointer;
}

.checkbox-group label {
  cursor: pointer;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  flex: 1;
}

.checkbox-group.checked label {
  color: var(--text-primary);
  text-decoration: line-through;
}

/* Output */
.output-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.output-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.output-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--accent);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-item {
  text-align: center;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: 10px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.alert {
  padding: 1rem 1.25rem;
  border-radius: 10px;
  font-size: 0.875rem;
  margin: 1rem 0;
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.alert-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: var(--success);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.data-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tr:hover td {
  background: rgba(0, 212, 170, 0.02);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-low {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.badge-medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.badge-high {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

/* Risk Bar */
.risk-bar {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin: 1rem 0;
}

.risk-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* Progress */
.progress-container {
  margin: 1.5rem 0;
}

.progress-bar {
  height: 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient);
  border-radius: 6px;
  transition: width 0.5s ease;
}

.progress-text {
  text-align: center;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Tags */
.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-light);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-top: none;
    flex-direction: column;
    padding: 1rem;
    gap: 0.75rem;
  }

  .main-nav.active {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Utility */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.4s ease;
}