/* 
 * Design System: Impeccable (InfoGrab)
 * Dark theme, Pretendard font, no purple gradients, animations required
 */

/* Base */
:root {
  --bg-primary: #0a0a0a;
  --bg-surface: #141414;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-tertiary: #797979;
  
  --accent: #579950; /* InfoGrab brand green */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --border: #303030;
  --border-light: #404040;
  
  --radius: 4px;
  --spacing: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
}

/* Typography */
* {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  margin: 0 0 var(--spacing-md) 0;
  line-height: 1.2;
}

h1 {
  font-size: 48px;
  margin-bottom: var(--spacing-xl);
}

h2 {
  font-size: 36px;
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: 24px;
  margin-bottom: var(--spacing-md);
}

p {
  font-size: 16px;
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-secondary);
}

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

a:hover {
  color: #3e6d38;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  gap: 8px;
}

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

.btn-primary:hover {
  background-color: #3e6d38;
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.btn-ghost:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 14px;
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: 18px;
}

/* Skip nav */
.skip-nav {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--bg-primary);
  padding: 8px;
  z-index: 100;
  transition: top 0.2s;
}

.skip-nav:focus {
  top: 0;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.header {
  background-color: var(--bg-primary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mark {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
}

.header-nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-cta {
  color: var(--bg-primary);
  background-color: var(--accent);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  font-weight: 700;
}

/* Hero */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-image-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(10, 10, 10, 0.9) 0%, rgba(20, 20, 20, 0.7) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 800px;
  padding: var(--spacing-xl);
}

.hero-badge {
  display: inline-block;
  background-color: var(--accent);
  color: var(--bg-primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.hero-title {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero-accent {
  color: var(--accent);
}

.hero-desc {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* How section */
.how-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--bg-secondary);
}

.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.how-card {
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.how-card--highlight {
  border-color: var(--accent);
  background-color: var(--bg-tertiary);
}

.how-num {
  display: block;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: var(--spacing-md);
}

.how-heading {
  font-size: 20px;
  margin-bottom: var(--spacing-md);
}

.how-text {
  color: var(--text-secondary);
  font-size: 16px;
}

/* Profile Panel */
.profile-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.profile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.preset-wrap {
  display: flex;
  gap: var(--spacing-sm);
}

.preset-btn {
  padding: 10px 16px;
  min-height: 44px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  background-color: var(--bg-tertiary);
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.slider-group {
  position: relative;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.slider-value {
  color: var(--accent);
  font-weight: 700;
}

.slider {
  width: 100%;
  height: 6px;
  background-color: var(--border);
  border-radius: 3px;
  -webkit-appearance: none;
}

.slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background-color: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background-color: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  transition: transform 0.2s;
}

.slider::-moz-range-thumb:hover {
  transform: scale(1.2);
}

.slider-range {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.toggle-label {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.toggle {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  background-color: var(--border);
  border-radius: 12px;
  transition: background-color 0.2s;
}

.toggle-switch::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 2px;
  width: 20px;
  height: 20px;
  background-color: var(--bg-primary);
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle:checked + .toggle-switch {
  background-color: var(--accent);
}

.toggle:checked + .toggle-switch::after {
  transform: translateX(20px);
}

.toggle-text {
  margin-left: var(--spacing-sm);
  font-size: 16px;
}

/* Matrix Panel */
.matrix-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.matrix-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.matrix-loading {
  display: none;
  animation: shimmer 1.5s infinite;
}

.skeleton-row {
  height: 60px;
  background: linear-gradient(90deg, var(--bg-primary) 25%, var(--bg-tertiary) 50%, var(--bg-primary) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
}

.matrix-error {
  text-align: center;
  padding: var(--spacing-xl);
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--error);
}

.matrix-empty {
  text-align: center;
  padding: var(--spacing-xl);
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
}

.matrix-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-primary);
}

.matrix-table th {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
}

.matrix-table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

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

.matrix-table .tool-logo {
  font-weight: 700;
  font-size: 18px;
  width: 40px;
  text-align: center;
}

.matrix-table .score-bar {
  height: 8px;
  background-color: var(--border);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.matrix-table .score-fill {
  height: 100%;
  background-color: var(--accent);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.matrix-table .score-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  text-align: right;
  color: var(--text-tertiary);
}

.matrix-table .badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 700;
  margin-right: 4px;
}

.matrix-table .badge-free {
  background-color: var(--success);
  color: var(--bg-primary);
}

.matrix-table .badge-paid {
  background-color: var(--warning);
  color: var(--bg-primary);
}

.matrix-table .badge-archived {
  background-color: var(--error);
  color: var(--bg-primary);
}

.matrix-table .badge-kst {
  background-color: var(--accent);
  color: var(--bg-primary);
}

.matrix-table .badge-n2sf {
  background-color: var(--success);
  color: var(--bg-primary);
}

.matrix-table .badge-mobile {
  background-color: var(--text-secondary);
  color: var(--bg-primary);
}

/* Insights */
.insights-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--bg-primary);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* Detail Section */
.detail-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--bg-secondary);
}

.accordion {
  display: grid;
  gap: var(--spacing-lg);
}

.accordion-item {
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}

.accordion-header {
  padding: var(--spacing-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  transition: background-color 0.2s;
}

.accordion-header:hover {
  background-color: var(--bg-tertiary);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 var(--spacing-lg);
}

.accordion-content-inner {
  padding-bottom: var(--spacing-lg);
}

.accordion-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.accordion-item.expanded .accordion-icon {
  transform: rotate(180deg);
}

/* Feature Visual */
.feature-visual {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.feature-visual-inner {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.feature-visual-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.feature-visual-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background-color: rgba(10, 10, 10, 0.8);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  max-width: 500px;
}

.feature-visual-title {
  font-size: 32px;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.feature-visual-desc {
  font-size: 18px;
  color: var(--text-secondary);
}

/* CTA Footer */
.cta-footer {
  background-color: var(--bg-secondary);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.cta-footer-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.cta-heading {
  font-size: 36px;
  margin-bottom: var(--spacing-md);
}

.cta-desc {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 14px;
}

.footer-link {
  color: var(--text-secondary);
  margin-left: var(--spacing-md);
}

/* Toast */
.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.toast.show {
  opacity: 1;
}

/* Animations */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 32px;
  }
  
  h2 {
    font-size: 28px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-desc {
    font-size: 16px;
  }
  
  .profile-grid {
    grid-template-columns: 1fr;
  }
  
  .matrix-table {
    font-size: 14px;
  }
  
  .matrix-table th, .matrix-table td {
    padding: var(--spacing-sm);
  }
  
  .feature-visual-content {
    position: relative;
    transform: none;
    margin-top: var(--spacing-lg);
  }
}

/* Loading states animation */
.loading {
  animation: pulse 1.5s infinite;
}

/* Success animation */
.success {
  animation: slideIn 0.3s ease;
}

/* Error animation */
.error {
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}