:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: rgba(37, 99, 235, 0.1);
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 0.5rem;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

html,
body {
  height: 100%;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  width: 100%;
}

/* Navbar */
.navbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s;
}
.nav-link:hover {
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  font-size: 0.875rem;
  font-family: inherit;
}
.btn-primary {
  background-color: var(--primary);
  color: white;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}
.btn-outline {
  background-color: transparent;
  border-color: var(--border);
  color: var(--text-main);
}
.btn-outline:hover {
  background-color: var(--bg-body);
  border-color: var(--text-muted);
}
.btn-outline.active {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}
.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}
.btn-text {
  white-space: nowrap;
}

/* Forms */
.form-control {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.875rem;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.title-input {
  width: auto;
  min-width: 180px;
  max-width: 250px;
  padding: 0.35rem 0.75rem;
}

/* Editor Layout */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.editor-container {
  display: flex;
  flex: 1;
  height: calc(100vh - 56px - 60px); /* viewport - navbar - footer */
  overflow: hidden;
}
.editor-pane,
.preview-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  min-width: 0;
}
.editor-pane {
  border-right: 1px solid var(--border);
}
.toolbar {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 0.25rem;
}
.toolbar-spacer {
  flex: 1;
}
.toolbar-label {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.875rem;
}
.view-controls {
  display: flex;
  gap: 0.25rem;
}
.editor-textarea {
  flex: 1;
  width: 100%;
  resize: none;
  border: none;
  padding: 1.5rem;
  font-family: "JetBrains Mono", "Menlo", "Monaco", "Courier New", monospace;
  font-size: 0.9375rem;
  line-height: 1.7;
  outline: none;
  background: var(--bg-body);
  color: var(--text-main);
}
.editor-textarea::placeholder {
  color: var(--text-muted);
}
.preview-content {
  flex: 1;
  padding: 1.5rem 2rem;
  overflow-y: auto;
  background: white;
}

/* Markdown Preview Styles */
.preview-content h1 {
  font-size: 2rem;
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--text-main);
}
.preview-content h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}
.preview-content h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}
.preview-content h4 {
  font-size: 1rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}
.preview-content p {
  margin-bottom: 1rem;
  line-height: 1.7;
}
.preview-content ul,
.preview-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
.preview-content li {
  margin-bottom: 0.25rem;
  line-height: 1.6;
}
.preview-content blockquote {
  border-left: 4px solid var(--primary);
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  margin: 1rem 0;
  background: var(--bg-body);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.preview-content pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  line-height: 1.6;
}
.preview-content code {
  font-family: "JetBrains Mono", "Menlo", monospace;
  background: #f1f5f9;
  padding: 0.2rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.875em;
}
.preview-content pre code {
  background: none;
  padding: 0;
}
.preview-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}
.preview-content th,
.preview-content td {
  border: 1px solid var(--border);
  padding: 0.75rem;
  text-align: left;
}
.preview-content th {
  background: var(--bg-body);
  font-weight: 600;
}
.preview-content a {
  color: var(--primary);
  text-decoration: none;
}
.preview-content a:hover {
  text-decoration: underline;
}
.preview-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}
.preview-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* Page Content (About, Privacy, Terms) */
.page-content {
  padding: 3rem 1rem;
  max-width: 800px;
}
.page-content h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}
.page-content h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}
.page-content p {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  color: var(--text-main);
}
.page-content .lead {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.page-content .text-muted {
  color: var(--text-muted);
  margin-bottom: 2rem;
}
.feature-list {
  margin: 1rem 0 2rem 1.5rem;
}
.feature-list li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
}

/* Footer */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  margin-top: auto;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-copyright,
.footer-credit {
  color: var(--text-muted);
  font-size: 0.875rem;
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--text-main);
}
.footer-social {
  display: flex;
  gap: 1rem;
  align-items: center;
}
.footer-social a {
  color: var(--text-muted);
  transition:
    color 0.2s,
    transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer-social a:hover {
  color: var(--primary);
  transform: translateY(-2px);
}
.footer-social svg {
  width: 20px;
  height: 20px;
}

/* Toast */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--text-main);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  font-size: 0.875rem;
  animation: slideIn 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.toast.success {
  background: #16a34a;
}
.toast.error {
  background: #dc2626;
}
.toast.info {
  background: var(--primary);
}
@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .editor-container {
    flex-direction: column;
    height: auto;
    min-height: calc(100vh - 56px - 60px);
  }
  .editor-pane,
  .preview-pane {
    border-right: none;
    min-height: 50vh;
  }
  .editor-pane {
    border-bottom: 1px solid var(--border);
  }
  .toolbar {
    flex-wrap: wrap;
  }
  .title-input {
    order: 10;
    flex: 1;
    min-width: 100%;
    margin-top: 0.5rem;
  }
  .toolbar-spacer {
    display: none;
  }

  .page-content {
    padding: 2rem 1rem;
  }
  .page-content h1 {
    font-size: 2rem;
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}