/* ============================================
   Prefile — Shared Styles
   Dark theme, indigo/violet accent
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --bg-input: #1e1e1e;
  --text-primary: #ececec;
  --text-secondary: #8e8e8e;
  --text-muted: #666;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-subtle: rgba(99, 102, 241, 0.1);
  --accent-border: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --border: #2a2a2a;
  --border-hover: #3a3a3a;
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --radius-lg: 1rem;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 900px;
  --header-height: 56px;
  --transition: 150ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

/* ---- Header ---- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  text-decoration: none;
}

.header-logo .logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
}

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

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

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

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

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

.btn-icon {
  padding: 0.5rem;
  min-width: 36px;
  justify-content: center;
}

/* ---- Layout ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-content {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

/* ---- Input / Textarea ---- */
.input,
.textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
}

.input:focus,
.textarea:focus {
  border-color: var(--accent);
}

.textarea {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  resize: vertical;
  min-height: 200px;
  line-height: 1.7;
}

/* ---- Card ---- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

/* ---- Tabs ---- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.tab {
  padding: 0.6rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}

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

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---- Output field ---- */
.output-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.5rem 0.5rem 0.85rem;
}

.output-field input {
  flex: 1;
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  outline: none;
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(100%);
  padding: 0.6rem 1.2rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  opacity: 0;
  transition: all 300ms ease;
  pointer-events: none;
  z-index: 1000;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- Markdown rendered content ---- */
.rendered-content {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-primary);
}

.rendered-content h1,
.rendered-content h2,
.rendered-content h3,
.rendered-content h4,
.rendered-content h5,
.rendered-content h6 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-weight: 600;
  line-height: 1.3;
}

.rendered-content h1 { font-size: 1.8rem; }
.rendered-content h2 { font-size: 1.4rem; }
.rendered-content h3 { font-size: 1.15rem; }

.rendered-content h1:first-child,
.rendered-content h2:first-child,
.rendered-content h3:first-child {
  margin-top: 0;
}

.rendered-content p {
  margin-bottom: 1em;
}

.rendered-content ul,
.rendered-content ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.rendered-content li {
  margin-bottom: 0.3em;
}

.rendered-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent);
}

.rendered-content pre {
  margin-bottom: 1em;
  padding: 1rem 1.2rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.rendered-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.65;
}

.rendered-content blockquote {
  margin-bottom: 1em;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.rendered-content blockquote p:last-child {
  margin-bottom: 0;
}

.rendered-content table {
  width: 100%;
  margin-bottom: 1em;
  border-collapse: collapse;
}

.rendered-content th,
.rendered-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.rendered-content th {
  background: var(--bg-tertiary);
  font-weight: 600;
  font-size: 0.85rem;
}

.rendered-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
}

.rendered-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

.rendered-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---- Viewer Toolbar ---- */
.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.viewer-toolbar .file-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.viewer-toolbar .file-badge {
  padding: 0.2rem 0.5rem;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid var(--accent-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
}

/* ---- Empty / Error States ---- */
.state-message {
  text-align: center;
  padding: 4rem 2rem;
}

.state-message .state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.state-message h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.state-message p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 400px;
  margin: 0 auto;
}

/* ---- Loading spinner ---- */
.spinner {
  width: 24px;
  height: 24px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Footer ---- */
.footer {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .header {
    padding: 0 1rem;
  }

  .container {
    padding: 0 1rem;
  }

  .viewer-toolbar {
    flex-wrap: wrap;
  }

  .viewer-toolbar .file-info {
    width: 100%;
  }
}