:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f8fa;
  --text-primary: #1a1a1a;
  --text-secondary: #6b7280;
  --accent-primary: #2563eb;
  --accent-secondary: #6366f1;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --code-border: #1f2937;
  --notice-info-bg: #eef4ff;
  --notice-info-border: #c7d2fe;
  --notice-info-text: #1e3a8a;
  --notice-warn-bg: #fff7ed;
  --notice-warn-border: #fde68a;
  --notice-warn-text: #7c2d12;
}

[data-theme="dark"] {
  --bg-primary: #1f1f23;
  --bg-secondary: #2a2a2f;
  --text-primary: #ececec;
  --text-secondary: #a1a1aa;
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --border-color: #374151;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
  --code-bg: #0b1324;
  --code-text: #d1d5db;
  --code-border: #293244;
  --notice-info-bg: #162036;
  --notice-info-border: #2a3a5f;
  --notice-info-text: #c7d2fe;
  --notice-warn-bg: #2b241a;
  --notice-warn-border: #4a3a20;
  --notice-warn-text: #facc15;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4rem;
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  z-index: 100;
}

.theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
}

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

/* Hero Section */
.hero {
  text-align: center;
  max-width: 600px;
  animation: fadeInUp 0.8s ease-out;
}

.logo {
  margin-bottom: 2rem;
  animation: pulse 2s infinite;
}

.logo svg {
  filter: drop-shadow(0 8px 16px rgba(37, 99, 235, 0.3));
}

.title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* Countdown Timer */
.countdown {
  text-align: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.countdown-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 500px;
}

.countdown-item {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.countdown-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-primary);
}

.countdown-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.countdown-item:hover::before {
  transform: scaleX(1);
}

.countdown-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
  font-variant-numeric: tabular-nums;
}

.countdown-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Newsletter Section */
.newsletter {
  text-align: center;
  max-width: 500px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.newsletter-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.newsletter-form {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.newsletter-input {
  flex: 1;
  padding: 1rem 1.5rem;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.newsletter-input::placeholder {
  color: var(--text-secondary);
}

.newsletter-button {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.newsletter-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.newsletter-button:active {
  transform: translateY(0);
}

.newsletter-success {
  color: #10b981;
  font-weight: 500;
  animation: fadeIn 0.5s ease-out;
}

/* Contact Section */
.contact {
  text-align: center;
  max-width: 600px;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.contact-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.contact-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.contact-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.contact-item svg {
  color: var(--accent-primary);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.social-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Home Page Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  width: 100%;
  max-width: 1200px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.tool-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text-primary);
}

.tool-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-primary);
}

.tool-icon {
  margin-bottom: 1.5rem;
  color: var(--accent-primary);
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.tool-card:hover .tool-icon {
  background: var(--accent-primary);
  color: white;
  transform: scale(1.1);
}

.tool-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Desktop App Teaser */
.desktop-app-teaser {
  text-align: center;
  max-width: 800px;
  padding: 3rem 2rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  margin-top: 2rem;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.desktop-app-teaser h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.desktop-app-teaser p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
    gap: 3rem;
  }
  
  .theme-toggle {
    top: 1rem;
    right: 1rem;
    width: 48px;
    height: 48px;
  }
  
  .countdown-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .countdown-item {
    padding: 1rem 0.5rem;
  }
  
  .countdown-number {
    font-size: 2rem;
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .newsletter-button {
    justify-content: center;
  }
  
  .contact-grid {
    gap: 0.75rem;
  }
  
  .contact-item {
    padding: 0.875rem 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 1rem;
    gap: 2rem;
  }
  
  .title {
    font-size: 2.5rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .countdown-grid {
    grid-template-columns: 1fr;
    max-width: 200px;
  }
  
  .social-links {
    gap: 0.75rem;
  }
  
  .social-link {
    width: 44px;
    height: 44px;
  }
}

/* Navigation */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 90;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-group {
  position: relative;
}

.nav-group-label {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
}

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

.nav-submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  min-width: 240px;
  padding: 0.5rem;
  z-index: 95;
}

.nav-group:hover .nav-submenu {
  display: block;
}

.nav-submenu .nav-link {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.5rem 0.75rem;
}

@media (max-width: 768px) {
  .nav-submenu {
    position: static;
    display: none;
    min-width: auto;
    margin-top: 0.25rem;
  }
  .nav-group:hover .nav-submenu {
    display: block;
  }
}

.nav-link {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
  position: relative;
}

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

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-primary);
  border-radius: 2px;
}

/* Adjust main container for fixed nav */
.container {
  margin-top: 60px; /* Space for nav */
}

/* Tool Sections */
.tool-section {
  width: 100%;
  max-width: 900px;
  animation: fadeInUp 0.5s ease-out;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

/* Forms */
.tool-form {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea,
.code-input {
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all 0.3s ease;
  width: 100%;
}

.code-input {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  min-height: 150px;
  resize: vertical;
  background: var(--code-bg);
  color: var(--code-text);
  border-color: var(--code-border);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.code-input:focus,
.result-box textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  background: var(--code-bg);
  color: var(--code-text);
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.primary-button,
.secondary-button {
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.secondary-button {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
}

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

/* Converter */
.dropzone {
  width: 100%;
  border: 2px dashed var(--border-color);
  border-radius: 0.75rem;
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dropzone:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.hidden-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.file-info {
  margin-top: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.code-boxes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  width: 100%;
}

.code-box {
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
  background: var(--bg-primary);
  box-shadow: var(--shadow);
}

.code-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
}

.code-box-title {
  font-weight: 600;
  color: var(--text-primary);
}

.copy-btn {
  background: transparent;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.25rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.copy-btn.copied {
  color: #10b981;
  border-color: #10b981;
}

.code-box-content {
  padding: 1rem;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  font-size: 0.9rem;
  overflow-x: auto;
  border-top: 1px solid var(--code-border);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  background: var(--bg-primary);
  padding: 1rem;
}

.faq-question {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.faq-answer {
  color: var(--text-secondary);
}

/* Results Area */
.results-area {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  animation: fadeIn 0.5s ease-out;
}

.notice-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.notice-info {
  background: var(--notice-info-bg);
  border-color: var(--notice-info-border);
  color: var(--notice-info-text);
}

.notice-warn {
  background: var(--notice-warn-bg);
  border-color: var(--notice-warn-border);
  color: var(--notice-warn-text);
}

.result-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.result-box h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.result-box textarea {
  width: 100%;
  min-height: 200px;
  padding: 1rem;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 0.5rem;
  color: var(--code-text);
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  font-size: 0.85rem;
  resize: vertical;
}

/* Tables */
.results-table-container {
  overflow-x: auto;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  animation: fadeIn 0.5s ease-out;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

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

.results-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-secondary);
}

.results-table td {
  color: var(--text-primary);
}

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

.results-table .label-cell {
  width: 30%;
  font-weight: 500;
  color: var(--text-secondary);
}

.results-table .value-cell {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  word-break: break-all;
}

.visit-counter {
  position: fixed;
  bottom: 12px;
  right: 16px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.7;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 4px 8px;
  box-shadow: var(--shadow);
  z-index: 80;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    -webkit-overflow-scrolling: touch;
  }
  
  .nav-link {
    white-space: nowrap;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .container {
    margin-top: 100px;
  }
}