:root {
  --bg: #fafbfc;
  --fg: #1a1a1a;
  --muted: #555;
  --accent: #2563eb;
  --accent-dark: #1e40af;
  --border: #e5e7eb;
  --card-bg: #ffffff;
  --success: #16a34a;
  --error: #dc2626;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  margin: 0;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.92rem;
}

.site-header nav a:hover { color: var(--accent); }

.hero {
  text-align: center;
  padding: 60px 0 30px;
}

.hero h1 {
  font-size: 2.6rem;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}

.hero .lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto;
}

.ad-slot {
  background: #f1f4f8;
  border: 1px dashed #cfd6e0;
  color: #99a3ad;
  text-align: center;
  padding: 20px;
  margin: 30px 0;
  border-radius: 6px;
  min-height: 90px;
  font-size: 0.85rem;
}

.ad-slot::before {
  content: "Ad space \2014 Google AdSense";
}

/* Post-convert reveal: hide mid-slot until conversion success, then fade in. */
.ad-slot-post {
  opacity: 0;
  max-height: 0;
  padding: 0;
  margin: 0;
  min-height: 0;
  border: 0;
  overflow: hidden;
  transition: opacity 0.4s ease, max-height 0.4s ease, padding 0.4s ease, margin 0.4s ease;
}
.ad-slot-post.visible {
  opacity: 1;
  max-height: 400px;
  padding: 20px;
  margin: 30px 0;
  min-height: 90px;
  border: 1px dashed #cfd6e0;
}

/* Universal converter entry (homepage) */
.universal-entry {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 18px 0 30px;
}
.universal-picker {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.universal-picker .uni-file {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #f6f8fa;
  border-radius: 6px;
  padding: 8px 12px;
  font-weight: 500;
}
.universal-picker .uni-file .remove {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0 4px;
  line-height: 1;
}
.universal-picker .uni-target {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}
.universal-picker select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  background: #fff;
}

/* Noscript banner */
.noscript-banner {
  background: #fef2f2;
  color: var(--error);
  border: 1px solid #fecaca;
  padding: 14px 18px;
  border-radius: 8px;
  margin: 20px 0;
  text-align: center;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.card {
  display: block;
  padding: 22px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-color: var(--accent);
}

.card h3 {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.features div {
  padding: 18px;
  background: #fff;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.features h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--accent-dark);
}

.features p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.faq details {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 10px 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.site-footer {
  margin-top: 80px;
  padding: 30px 0;
  background: #fff;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
  margin: 0 4px;
}

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

/* Converter page */
.converter-app {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px;
  margin: 30px 0;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 50px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: #f0f6ff;
}

.dropzone p {
  margin: 8px 0;
  color: var(--muted);
}

.dropzone .big {
  font-size: 1.1rem;
  color: var(--fg);
  font-weight: 600;
}

.dropzone input[type=file] {
  display: none;
}

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

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

.btn:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
}

.btn-secondary {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.file-list {
  margin: 20px 0;
}

.file-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: #f6f8fa;
  border-radius: 6px;
  margin: 6px 0;
}

.file-item .name { font-weight: 500; word-break: break-all; }
.file-item .size { color: var(--muted); font-size: 0.85rem; margin-left: 12px; }
.file-item .remove {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0 8px;
}

.status {
  margin: 14px 0;
  padding: 12px;
  border-radius: 6px;
  font-size: 0.95rem;
}

.status.info { background: #eff6ff; color: var(--accent-dark); }
.status.success { background: #f0fdf4; color: var(--success); }
.status.error { background: #fef2f2; color: var(--error); }
.status.hidden { display: none; }

.progress {
  width: 100%;
  height: 6px;
  background: #e5e7eb;
  border-radius: 3px;
  margin: 8px 0;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.2s;
}

.actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.controls {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 18px 0;
}

.controls label {
  font-size: 0.92rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.controls select, .controls input {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
}

.page-intro {
  text-align: center;
  padding: 40px 0 10px;
}

.page-intro h1 {
  font-size: 2.2rem;
  margin: 0 0 12px;
}

.page-intro p {
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.content-section {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px;
  margin: 24px 0;
}

.content-section h2 {
  margin-top: 0;
  font-size: 1.4rem;
}

.content-section h3 {
  font-size: 1.1rem;
  margin-top: 22px;
}

/* Consent banner */
#fbc-consent {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  padding: 16px 18px;
  z-index: 9999;
  max-width: 720px;
  margin: 0 auto;
}
.fbc-consent-inner { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.fbc-consent-inner p { margin: 0; flex: 1 1 280px; font-size: 0.92rem; color: var(--muted); }
.fbc-consent-actions { display: flex; gap: 8px; flex-wrap: wrap; }
#fbc-consent .btn { padding: 8px 14px; font-size: 0.9rem; }

@media (max-width: 640px) {
  .site-header .container { flex-direction: column; height: auto; padding: 12px 20px; }
  .site-header nav { margin-top: 10px; }
  .site-header nav a { margin: 0 8px; font-size: 0.85rem; }
  .hero h1 { font-size: 1.9rem; }
  .hero { padding: 30px 0 20px; }
  #fbc-consent { left: 8px; right: 8px; bottom: 8px; padding: 14px; }
}