/* ============================================
   otft.co.kr - Developer Tools
   공통 스타일 (확장 용이)
   ============================================ */

:root {
  /* Colors - Dark Theme */
  --bg-primary: #0f1419;
  --bg-secondary: #1a2332;
  --bg-tertiary: #243447;
  --bg-card: #1e2a3a;
  
  --text-primary: #e7e9ea;
  --text-secondary: #8b98a5;
  --text-muted: #6e767d;
  
  --accent: #1d9bf0;
  --accent-hover: #1a8cd8;
  --accent-muted: rgba(29, 155, 240, 0.15);
  
  --success: #00ba7c;
  --error: #f4212e;
  --warning: #ffd400;
  
  --border: #38444d;
  --border-focus: var(--accent);
  
  /* Typography */
  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --sidebar-width: 260px;
  --header-height: 56px;
  --radius: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========== Layout ========== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ========== Sidebar ========== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition: transform var(--transition), width var(--transition);
}

.sidebar-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
}

.sidebar-logo:hover {
  color: var(--accent-hover);
}

.sidebar-nav {
  padding: 1rem 0;
}

.nav-section {
  margin-bottom: 1.5rem;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0 1.25rem;
  margin-bottom: 0.5rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1.25rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

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

.nav-link.active {
  background: var(--accent-muted);
  color: var(--accent);
  border-left-color: var(--accent);
}

/* ========== Main Content ========== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-header {
  height: var(--header-height);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 50;
}

.main-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.main-body {
  flex: 1;
  padding: 2rem;
}

/* ========== Cards ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ========== Form Elements ========== */
.form-group {
  margin-bottom: 1rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

textarea.form-input,
input.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color var(--transition);
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

textarea.form-input:focus,
input.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-muted);
}

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

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

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

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

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

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

.btn-icon {
  padding: 0.5rem;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* ========== Toolbar (Copy, Clear 등) ========== */
.toolbar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ========== Output Area ========== */
.output-area {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  min-height: 80px;
  white-space: pre-wrap;
  word-break: break-all;
}

.output-area.success {
  border-color: var(--success);
}

.output-area.error {
  border-color: var(--error);
  color: var(--error);
}

/* ========== Dashboard Grid ========== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: all var(--transition);
}

.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tool-card-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-muted);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.tool-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.tool-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========== Toast (Copy feedback) ========== */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.75rem 1.25rem;
  background: var(--success);
  color: white;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 1000;
  animation: slideIn 0.3s ease;
}

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

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .main-body {
    padding: 1rem;
  }
  
  .main-header {
    padding: 0 1rem;
  }
}

/* ========== Utility ========== */
.text-mono {
  font-family: var(--font-mono);
}

.text-success {
  color: var(--success);
}

.text-error {
  color: var(--error);
}

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

/* ========== Main Footer ========== */
.main-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--accent);
}

.nav-link-lotto {
  margin-top: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}