/* PDFree - clean, modern, mobile-first styles (no frameworks) */

:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1a2333;
  --muted: #5b6b85;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e2e8f2;
  --success: #15803d;
  --error: #b91c1c;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(20, 40, 90, 0.07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- header ---------- */
.site-header {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: #fff;
  padding: 36px 0 30px;
  text-align: center;
}
.brand { display: flex; align-items: center; justify-content: center; gap: 10px; }
.brand-icon { font-size: 2rem; }
.brand h1 { margin: 0; font-size: 2.2rem; letter-spacing: 0.5px; }
.tagline { margin: 8px 0 4px; font-size: 1.1rem; opacity: 0.95; }
.privacy-badge {
  display: inline-block;
  margin: 10px 0 0;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.92rem;
}

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  justify-content: center;
}
.tab-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- panels ---------- */
.tool-panel {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 18px 0 8px;
}
.tool-panel.active { display: block; }
.tool-panel h2 { margin-top: 0; }
.tool-panel h3 { margin: 22px 0 10px; font-size: 1.05rem; }
.how { color: var(--muted); }
.how code, .field-label code { background: #eef2f9; padding: 1px 6px; border-radius: 6px; font-size: 0.9em; }

/* ---------- dropzone ---------- */
.dropzone {
  border: 2px dashed #b9c6e2;
  border-radius: var(--radius);
  background: #fafcff;
  text-align: center;
  padding: 34px 18px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin: 16px 0;
}
.dropzone:hover { border-color: var(--primary); }
.dropzone.drag { border-color: var(--primary); background: #eef4ff; }
.dropzone:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.dz-icon { font-size: 2rem; }
.dz-sub { color: var(--muted); font-size: 0.9rem; margin: 4px 0 0; }

/* ---------- buttons & inputs ---------- */
.btn-primary, .btn-secondary, .btn-ghost {
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-secondary { background: #eef2f9; color: var(--text); }
.btn-secondary:hover { background: #e0e8f7; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: #b9c6e2; }

.row { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; align-items: center; }

.text-input {
  width: 100%;
  max-width: 420px;
  padding: 11px 14px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.text-input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
.field-label { display: block; margin: 14px 0 6px; font-weight: 600; }

input[type="range"] { width: 100%; max-width: 420px; accent-color: var(--primary); }

.quality-pick {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 14px 0;
  display: grid;
  gap: 8px;
}
.quality-pick legend { font-weight: 700; padding: 0 8px; }

/* ---------- file list ---------- */
.file-list { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 8px; }
.file-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  background: #f4f7fd;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
}
.file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-ctrls { display: flex; gap: 6px; flex-shrink: 0; }
.file-ctrls button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  width: 34px; height: 34px;
  font-size: 1rem;
  cursor: pointer;
}
.file-ctrls button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.file-ctrls button:disabled { opacity: 0.35; cursor: not-allowed; }

/* ---------- thumbnails ---------- */
.thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
  margin: 14px 0;
}
.thumb {
  position: relative;
  border: 2px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}
.thumb canvas { width: 100%; height: auto; display: block; }
.thumb.selectable { cursor: pointer; }
.thumb.selectable:hover { border-color: #93b4f5; }
.thumb.selected { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.35); }
.thumb-label {
  display: block;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 3px 0;
  background: #f7f9fd;
}
.rot-badge {
  position: absolute;
  top: 4px; right: 4px;
  background: var(--primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
}

.fileinfo { color: var(--muted); font-size: 0.95rem; }
.hint { color: var(--muted); font-size: 0.92rem; }
.result-line { margin: 10px 0; font-size: 1.02rem; }

/* ---------- status ---------- */
.status { margin: 12px 0 0; font-size: 0.95rem; min-height: 1.2em; }
.status.show.info { color: var(--muted); }
.status.show.success { color: var(--success); font-weight: 600; }
.status.show.error { color: var(--error); font-weight: 600; }

/* ---------- sign tool ---------- */
#sig-pad {
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #fff;
  width: 100%;
  max-width: 520px;
  height: auto;
  touch-action: none;
  cursor: crosshair;
  display: block;
}
.sign-stage-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 10px; background: #eef1f7; padding: 12px; margin: 10px 0; }
#sign-stage { position: relative; display: inline-block; line-height: 0; }
#sign-preview { max-width: none; border-radius: 4px; box-shadow: var(--shadow); }
#sign-overlay {
  position: absolute;
  cursor: move;
  touch-action: none;
  user-select: none;
  -webkit-user-drag: none;
  background: transparent;
}

/* ---------- faq ---------- */
.faq {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 26px 0;
}
.faq h2 { margin-top: 0; }
.faq h3 { margin: 18px 0 4px; font-size: 1.02rem; }
.faq p { margin: 4px 0 0; color: var(--muted); }

/* ---------- footer ---------- */
.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 26px 0 40px;
  font-size: 0.92rem;
}
.site-footer .fine { font-size: 0.82rem; }

.hidden { display: none !important; }

/* ---------- responsive ---------- */
@media (max-width: 600px) {
  .tool-panel, .faq { padding: 18px 14px; }
  .brand h1 { font-size: 1.7rem; }
  .tab-btn { padding: 9px 14px; font-size: 0.88rem; }
  .file-item { flex-direction: column; align-items: stretch; }
  .file-ctrls { justify-content: flex-end; }
}