:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --text-dim: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #16a34a;
  --error: #dc2626;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 40px 0 28px;
  text-align: center;
}
.site-header h1 { font-size: 2rem; margin-bottom: 6px; }
.tagline { color: var(--text-dim); font-size: 0.95rem; }

/* Ad slot */
.ad-slot {
  max-width: 728px;
  margin: 24px auto;
  min-height: 90px;
  background: repeating-linear-gradient(45deg, #f1f5f9, #f1f5f9 10px, #e8edf3 10px, #e8edf3 20px);
  border: 1px dashed var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* Tool grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 32px 0;
}

.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.08); }
.tool-icon { font-size: 1.6rem; margin-bottom: 10px; }
.tool-card h2 { font-size: 1.15rem; margin-bottom: 6px; }
.tool-card p { font-size: 0.88rem; color: var(--text-dim); }

/* Sections */
.section { padding: 24px 0; }
.section h2 { font-size: 1.3rem; margin-bottom: 12px; }
.section h3 { font-size: 1rem; margin: 16px 0 6px; }
.section p, .section li { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 8px; }
.section ul, .section ol { padding-left: 22px; }

.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 24px;
}

/* Footer */
.site-footer {
  margin-top: auto;
  text-align: center;
  padding: 28px 20px;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--card);
}
.site-footer nav { margin-top: 6px; }
.site-footer a { color: var(--text-dim); margin: 0 8px; }

/* ===== Tool pages ===== */
.tool-page { padding: 32px 0 48px; flex: 1; }
.back-link { color: var(--accent); text-decoration: none; font-size: 0.85rem; }
.tool-title { font-size: 1.7rem; margin: 10px 0 4px; }
.tool-subtitle { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 24px; }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--accent); background: #eff6ff; }
.drop-zone strong { color: var(--text); }
.drop-zone .hint { font-size: 0.82rem; margin-top: 6px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; align-items: center; }

button, .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}
button:hover, .btn:hover { background: var(--accent-hover); }
button.secondary, .btn.secondary { background: var(--border); color: var(--text); }
button.secondary:hover { background: #cbd5e1; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

label.inline { display: inline-flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--text-dim); }
input[type="number"], input[type="range"], select {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
}
input[type="number"] { width: 90px; }

.file-list { margin-top: 16px; }
.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  font-size: 0.85rem;
}
.file-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-item .sizes { color: var(--text-dim); white-space: nowrap; }
.file-item .sizes .saved { color: var(--success); font-weight: 600; }
.file-item a.dl { color: var(--accent); font-weight: 600; white-space: nowrap; }
.file-item .status { color: var(--text-dim); font-size: 0.8rem; white-space: nowrap; }
.file-item .status.done { color: var(--success); }
.file-item .status.error { color: var(--error); }

.msg { font-size: 0.85rem; margin-top: 8px; min-height: 1.2em; }
.msg.ok { color: var(--success); }
.msg.error { color: var(--error); }

@media (max-width: 640px) {
  .site-header h1 { font-size: 1.5rem; }
  .tool-title { font-size: 1.35rem; }
  .panel { padding: 16px; }
}