/* ── Toolkit PDF Tools — Dark Theme ── */
:root {
  --bg: #0f172a; --bg-2: #1e293b; --bg-3: #2d3a4d;
  --border: #334155;
  --text: #e2e8f0; --text-2: #94a3b8; --text-3: #64748b;
  --primary: #60a5fa; --primary-2: #a78bfa;
  --success: #34d399; --warning: #fbbf24; --danger: #f87171;
  --radius: 10px; --radius-lg: 16px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh; line-height: 1.6;
}
.container { max-width: 860px; margin: 0 auto; padding: 60px 20px 40px; }

/* ── HEADER ── */
header { text-align: center; margin-bottom: 32px; }
.back-link {
  display: inline-block; margin-bottom: 20px; margin-top: 16px;
  color: var(--text-2); text-decoration: none; font-size: 0.88em;
}
.back-link:hover { color: var(--primary); }
header h1 {
  font-size: 2em;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}
header p { color: var(--text-2); max-width: 540px; margin: 0 auto; }

/* ── NAV TABS ── */
.nav-tabs {
  display: flex; justify-content: center; flex-wrap: wrap;
  gap: 6px; margin-bottom: 28px;
}
.nav-tab {
  padding: 8px 18px; border-radius: 8px;
  background: var(--bg-2); border: 1px solid var(--border);
  color: var(--text-2); text-decoration: none;
  font-size: 0.88em; font-weight: 500;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.nav-tab:hover { border-color: var(--primary); color: var(--primary); }
.nav-tab.active {
  background: var(--primary); border-color: var(--primary);
  color: var(--bg); font-weight: 600;
}

/* ── PRIVACY BADGE ── */
.privacy-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(52,211,153,0.08); border: 1px solid rgba(52,211,153,0.2);
  border-radius: 20px; padding: 6px 14px;
  font-size: 0.82em; color: #34d399; margin-bottom: 28px;
}

/* ── DROP ZONE ── */
.drop-zone {
  border: 2px dashed var(--border); border-radius: var(--radius-lg);
  padding: 40px 20px; text-align: center;
  cursor: pointer; transition: border-color 0.2s, background 0.2s;
  margin-bottom: 20px;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(96,165,250,0.05);
}
.drop-zone .icon { font-size: 2.5em; margin-bottom: 12px; }
.drop-zone p { color: var(--text-2); font-size: 0.92em; }
.drop-zone .hint { font-size: 0.78em; color: var(--text-3); margin-top: 4px; }

/* ── CONTROLS ── */
.controls {
  display: flex; gap: 10px; flex-wrap: wrap;
  justify-content: center; margin-bottom: 20px;
}
select {
  padding: 10px 16px; border-radius: 8px;
  background: var(--bg-2); border: 1px solid var(--border);
  color: var(--text); font-size: 0.9em;
  cursor: pointer;
}
select:focus { outline: none; border-color: var(--primary); }

/* ── FILE LIST ── */
.file-list {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px;
  max-height: 220px; overflow-y: auto; margin-bottom: 16px;
  text-align: left;
}
.file-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 0; border-bottom: 1px solid var(--border);
  font-size: 0.88em;
}
.file-item:last-child { border-bottom: none; }
.file-item .name { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.file-item .size { color: var(--text-3); margin-left: 10px; font-size: 0.82em; white-space: nowrap; }
.file-item .remove {
  background: none; border: 0; color: var(--text-3);
  cursor: pointer; margin-left: 8px; font-size: 1em;
  padding: 2px 6px; border-radius: 4px;
}
.file-item .remove:hover { background: rgba(248,113,113,0.1); color: var(--danger); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: 8px;
  font-size: 0.95em; font-weight: 600; cursor: pointer;
  border: 0; transition: opacity 0.2s, transform 0.2s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: var(--bg);
}
.btn-success { background: var(--success); color: var(--bg); }
.btn-outline {
  background: transparent; border: 1px solid var(--border); color: var(--text-2);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ── ACTION BAR ── */
.action-bar { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 20px; }

/* ── PROGRESS ── */
.progress-wrap { margin: 16px 0; }
.progress-bar-bg {
  background: var(--bg-2); border-radius: 6px; height: 8px;
  overflow: hidden; margin-bottom: 6px;
}
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-2)); border-radius: 6px; transition: width 0.3s; }
.progress-text { font-size: 0.82em; color: var(--text-3); text-align: center; }

/* ── RESULT ── */
.result-box {
  background: rgba(52,211,153,0.06); border: 1px solid rgba(52,211,153,0.2);
  border-radius: var(--radius); padding: 20px; margin: 16px 0;
  text-align: center;
}
.result-box .savings { font-size: 1.4em; font-weight: 700; color: var(--success); margin-bottom: 4px; }
.result-box .desc { font-size: 0.85em; color: var(--text-2); margin-bottom: 12px; }

/* ── ERROR ── */
.error-msg {
  background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.2);
  border-radius: 8px; padding: 12px 16px; margin: 12px 0;
  color: var(--danger); font-size: 0.88em; text-align: center;
}

/* ── LOADING ── */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(15,23,42,0.8);
  display: flex; align-items: center; justify-content: center;
  z-index: 999; backdrop-filter: blur(4px);
}
.loading-box {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 40px;
  text-align: center;
}
.loading-box .spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-box p { color: var(--text-2); font-size: 0.92em; }

/* ── PDF PAGE PREVIEW ── */
.page-preview-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px; margin: 16px 0;
}
.page-thumb {
  border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden; cursor: pointer;
  transition: border-color 0.2s;
}
.page-thumb:hover { border-color: var(--primary); }
.page-thumb.selected { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(96,165,250,0.3); }
.page-thumb canvas { display: block; width: 100%; }
.page-thumb .page-num {
  background: var(--bg-2); text-align: center;
  font-size: 0.72em; color: var(--text-3); padding: 3px;
}

/* ── OTHER TOOLS ── */
.other-tools {
  margin-top: 36px; padding-top: 24px;
  border-top: 1px solid var(--border);
}
.other-tools h3 { font-size: 0.95em; color: var(--text-2); margin-bottom: 12px; text-align: center; }
.other-tools-links { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

/* ── FOOTER ── */
footer {
  text-align: center; padding: 30px 0;
  color: var(--text-3); font-size: 0.82em;
  border-top: 1px solid var(--border); margin-top: 40px;
}
footer a { color: var(--text-2); text-decoration: none; margin: 0 8px; }
footer a:hover { color: var(--primary); }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .container { padding: 50px 16px 30px; }
  header h1 { font-size: 1.6em; }
  .drop-zone { padding: 28px 16px; }
  .btn { width: 100%; }
}