/* ============================================================
   X Article to Markdown — Styles
   ============================================================ */

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

/* --- Tokens ------------------------------------------------- */
:root {
  --bg: #f8f9fb;
  --bg-subtle: #f0f2f5;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border: #e5e7eb;
  --border-subtle: #f3f4f6;
  --primary: #0f172a;
  --primary-hover: #1e293b;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.08);
  --success: #10b981;
  --success-soft: rgba(16, 185, 129, 0.08);
  --error: #ef4444;
  --error-soft: rgba(239, 68, 68, 0.08);
  --info: #3b82f6;
  --info-soft: rgba(59, 130, 246, 0.08);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0b;
    --bg-subtle: #111113;
    --surface: #161618;
    --surface-raised: #1c1c1f;
    --text: #f0f0f0;
    --text-secondary: #a0a0a8;
    --text-tertiary: #6b6b73;
    --border: #2a2a2e;
    --border-subtle: #1f1f23;
    --primary: #f0f0f0;
    --primary-hover: #ffffff;
    --accent: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.1);
    --success: #34d399;
    --success-soft: rgba(52, 211, 153, 0.1);
    --error: #f87171;
    --error-soft: rgba(248, 113, 113, 0.1);
    --info: #60a5fa;
    --info-soft: rgba(96, 165, 250, 0.1);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
  }
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* Touch targets: min 44px for mobile accessibility */
button, input, .tool-logo {
  min-height: 44px;
}

/* Prevent zoom on input focus (iOS) */
@media (max-width: 600px) {
  input[type="url"] {
    font-size: 16px;
  }
}

/* --- Page Layout -------------------------------------------- */
.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.25rem 2rem;
}

/* --- Hero / Header ------------------------------------------ */
.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.logo-icon {
  color: var(--text);
}

.logo-arrow {
  color: var(--text-tertiary);
}

.logo-md-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.5rem;
  background: var(--accent);
  color: #fff;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-md-badge svg {
  display: none;
}

.logo-md-badge::after {
  content: "MD";
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 420px;
  margin: 0 auto;
}

/* --- Input Card --------------------------------------------- */
.input-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1rem;
}

.input-row {
  display: flex;
  gap: 0.625rem;
}

.input-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.875rem;
  color: var(--text-tertiary);
  pointer-events: none;
  flex-shrink: 0;
}

#url-input {
  width: 100%;
  padding: 0.75rem 0.875rem 0.75rem 2.625rem;
  font-size: 0.95rem;
  font-family: var(--sans);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

#url-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#url-input::placeholder {
  color: var(--text-tertiary);
}

#convert-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--sans);
  background: var(--primary);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
}

#convert-btn:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-sm);
}

#convert-btn:active {
  transform: scale(0.97);
}

#convert-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.input-hint {
  margin-top: 0.625rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* Loading spinner in button */
#convert-btn.loading .btn-icon {
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* --- Status ------------------------------------------------- */
.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1rem;
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.status.error {
  background: var(--error-soft);
  color: var(--error);
}

.status.info {
  background: var(--info-soft);
  color: var(--info);
}

.status.success {
  background: var(--success-soft);
  color: var(--success);
}

.status-icon::before {
  font-size: 1rem;
}

.status.error .status-icon::before { content: "\2715"; }
.status.info .status-icon::before { content: "\21BB"; }
.status.success .status-icon::before { content: "\2713"; }

/* --- Output ------------------------------------------------- */
.output-section {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.output-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
}

.output-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.output-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: var(--mono);
}

.output-actions {
  display: flex;
  gap: 0.375rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--sans);
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn-action.copied {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.output-body {
  position: relative;
}

#markdown-output {
  width: 100%;
  min-height: 420px;
  padding: 1.25rem;
  font-family: var(--mono);
  font-size: 0.825rem;
  line-height: 1.7;
  border: none;
  background: var(--surface);
  color: var(--text);
  resize: vertical;
  outline: none;
  tab-size: 2;
}

/* --- Features ----------------------------------------------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.feature {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.feature-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.feature strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.1rem;
}

.feature span {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- Use Cases ---------------------------------------------- */
.use-cases {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.use-cases h2 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 0.25rem;
}

.use-cases-sub {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.use-case {
  padding: 1.125rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.use-case:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.use-case-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 0.625rem;
}

.use-case strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.use-case span {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* Works-with tags */
.works-with {
  margin-top: 1.5rem;
  text-align: center;
}

.works-with-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: 0.625rem;
}

.tool-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.tool-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.625rem 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.15s;
  cursor: default;
  min-width: 76px;
}

.tool-logo span {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.tool-logo:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  transform: translateY(-2px);
}

.tool-logo:hover span {
  color: var(--text);
}

/* --- FAQ ---------------------------------------------------- */
.faq {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.faq h2 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 1.25rem;
}

.faq-item {
  margin-bottom: 1.25rem;
}

.faq-item h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--text);
}

.faq-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Footer ------------------------------------------------- */
footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  padding-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.75rem;
}

.footer-links a {
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 0.75rem;
  transition: color 0.15s;
}

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

/* --- Responsive --------------------------------------------- */
/* --- Tablet ------------------------------------------------- */
@media (max-width: 768px) {
  .features {
    grid-template-columns: 1fr 1fr;
  }

  .tool-logos {
    gap: 0.5rem;
  }

  .tool-logo {
    min-width: 64px;
    padding: 0.5rem 0.625rem;
  }
}

/* --- Mobile ------------------------------------------------- */
@media (max-width: 600px) {
  .page {
    padding: 1.5rem 0.875rem 1.25rem;
  }

  .hero {
    margin-bottom: 1.75rem;
  }

  .logo {
    padding: 0.375rem 0.75rem;
    gap: 0.375rem;
  }

  .logo-icon {
    width: 24px;
    height: 24px;
  }

  h1 {
    font-size: 1.35rem;
  }

  .tagline {
    font-size: 0.9rem;
  }

  /* Input */
  .input-card {
    padding: 1rem;
  }

  .input-row {
    flex-direction: column;
    gap: 0.5rem;
  }

  #url-input {
    font-size: 0.9rem;
    padding: 0.875rem 0.875rem 0.875rem 2.5rem;
  }

  #convert-btn {
    width: 100%;
    justify-content: center;
    padding: 0.875rem;
    font-size: 1rem;
  }

  .input-hint {
    font-size: 0.75rem;
  }

  /* Output */
  .output-toolbar {
    flex-direction: column;
    gap: 0.5rem;
    align-items: stretch;
  }

  .output-meta {
    justify-content: space-between;
  }

  .output-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.375rem;
  }

  .btn-action {
    justify-content: center;
    padding: 0.5rem;
  }

  #markdown-output {
    min-height: 300px;
    font-size: 0.78rem;
    padding: 1rem;
  }

  /* Features */
  .features {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
  }

  .feature {
    gap: 0.625rem;
  }

  .feature-icon {
    width: 32px;
    height: 32px;
  }

  .feature-icon svg {
    width: 16px;
    height: 16px;
  }

  /* Use cases */
  .use-cases {
    margin-top: 2rem;
    padding-top: 1.5rem;
  }

  .use-cases h2 {
    font-size: 1.1rem;
  }

  .use-cases-sub {
    font-size: 0.85rem;
    margin-bottom: 1rem;
  }

  .use-cases-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .use-case {
    padding: 0.875rem;
  }

  /* Tool logos */
  .works-with {
    margin-top: 1.25rem;
  }

  .tool-logos {
    gap: 0.375rem;
  }

  .tool-logo {
    min-width: 0;
    padding: 0.5rem;
    flex: 1;
    min-width: 56px;
  }

  .tool-logo svg {
    width: 20px;
    height: 20px;
  }

  .tool-logo span {
    font-size: 0.6rem;
  }

  /* Status */
  .status {
    font-size: 0.8rem;
    padding: 0.625rem 0.875rem;
  }

  /* Footer */
  footer {
    margin-top: 1.5rem;
    font-size: 0.75rem;
  }
}

/* --- Small phones ------------------------------------------- */
@media (max-width: 380px) {
  .page {
    padding: 1.25rem 0.75rem 1rem;
  }

  h1 {
    font-size: 1.2rem;
  }

  .tool-logos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .tool-logo {
    min-width: 0;
  }
}