:root {
  --bg: #0a0b10;
  --surface: rgba(255,255,255,0.04);
  --surface-2: rgba(255,255,255,0.06);
  --surface-hover: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.16);
  --accent: #6c63ff;
  --accent-glow: rgba(108,99,255,0.3);
  --cyan: #06b6d4;
  --rose: #f43f5e;
  --amber: #f59e0b;
  --emerald: #10b981;
  --text: #e8e9f0;
  --muted: #7b7f99;
  --ok: #34d399;
  --err: #f87171;
  --warn: #fbbf24;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
}

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

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  overflow-x: hidden;
}

/* ── Background orbs ── */
.bg-orb { position: fixed; border-radius: 50%; filter: blur(100px); pointer-events: none; z-index: 0; opacity: 0.3; }
.orb-a { width: 500px; height: 500px; background: radial-gradient(circle, #6c63ff 0%, transparent 70%); top: -180px; right: -120px; animation: orbFloat 14s ease-in-out infinite alternate; }
.orb-b { width: 400px; height: 400px; background: radial-gradient(circle, #06b6d4 0%, transparent 70%); bottom: -150px; left: -100px; animation: orbFloat 18s ease-in-out infinite alternate-reverse; }
.orb-c { width: 300px; height: 300px; background: radial-gradient(circle, #f43f5e 0%, transparent 70%); top: 40%; left: 50%; animation: orbFloat 20s ease-in-out infinite alternate; }

/* ── App shell ── */
#app { position: relative; z-index: 1; width: min(860px, calc(100% - 2rem)); margin: 0 auto; padding: 2.5rem 0 4rem; }

/* ── Header ── */
.site-header { text-align: center; margin-bottom: 2rem; }
.logo { font-size: 2.4rem; display: block; margin-bottom: 0.3rem; }
.site-title { font-size: 1.7rem; font-weight: 800; letter-spacing: -0.03em; background: linear-gradient(135deg, var(--accent), var(--cyan)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.site-sub { margin-top: 0.3rem; color: var(--muted); font-size: 0.9rem; }
.badges { display: flex; justify-content: center; gap: 0.45rem; margin-top: 0.9rem; flex-wrap: wrap; }
.badge { font-size: 0.68rem; font-weight: 600; padding: 0.22rem 0.6rem; border-radius: 20px; border: 1px solid rgba(108,99,255,0.2); background: rgba(108,99,255,0.08); color: #9b94ff; }

/* ── Search ── */
.search-wrap { margin-bottom: 1.8rem; }
.search-input { width: 100%; padding: 0.7rem 1rem 0.7rem 2.6rem; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; font-size: 0.92rem; outline: none; transition: border-color 0.2s, box-shadow 0.2s; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%237b7f99' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: 0.8rem center; }
.search-input::placeholder { color: var(--muted); }
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

/* ── Category sections ── */
.category { margin-bottom: 2rem; }
.category-title { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 0.7rem; padding-left: 0.15rem; }
.category-title .cat-icon { margin-right: 0.3rem; }

/* ── Tool grid ── */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0.7rem; }
.tool-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem; cursor: pointer; transition: all 0.18s ease; text-decoration: none; color: inherit; display: flex; flex-direction: column; gap: 0.35rem; }
.tool-card:hover { background: var(--surface-hover); border-color: var(--border-hover); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,0,0,0.3); }
.tool-card .tc-icon { font-size: 1.5rem; }
.tool-card .tc-name { font-size: 0.88rem; font-weight: 700; }
.tool-card .tc-desc { font-size: 0.74rem; color: var(--muted); line-height: 1.4; }

/* ── Tool View (work page) ── */
.tool-view { animation: fadeSlideUp 0.25s ease both; }
.tool-topbar { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 1.5rem; }
.btn-back { background: var(--surface); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius-sm); padding: 0.4rem 0.9rem; font: inherit; font-size: 0.82rem; font-weight: 600; cursor: pointer; transition: background 0.15s; }
.btn-back:hover { background: var(--surface-hover); }
.tool-heading { font-size: 1.3rem; font-weight: 800; }

/* ── Drop zone ── */
.drop-zone { border: 2px dashed var(--border); border-radius: var(--radius); background: var(--surface); padding: 2.5rem 2rem; text-align: center; cursor: pointer; transition: border-color 0.2s, background 0.2s, box-shadow 0.2s; outline: none; }
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--accent); background: rgba(108,99,255,0.06); box-shadow: 0 0 0 4px var(--accent-glow); }
.dz-icon { font-size: 2.2rem; margin-bottom: 0.6rem; }
.dz-label { font-size: 0.95rem; font-weight: 600; }
.dz-sub { font-size: 0.8rem; color: var(--muted); margin-top: 0.25rem; }

/* ── File list (in tool view) ── */
.tv-file-list { margin-top: 1rem; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.tv-file-item { display: flex; align-items: center; gap: 0.7rem; padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); font-size: 0.85rem; animation: fadeIn 0.15s ease both; }
.tv-file-item:last-child { border-bottom: none; }
.tv-file-icon { font-size: 1.1rem; flex-shrink: 0; }
.tv-file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; }
.tv-file-size { color: var(--muted); font-size: 0.76rem; flex-shrink: 0; }
.tv-file-remove { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 0.9rem; padding: 0.15rem 0.3rem; transition: color 0.15s; flex-shrink: 0; }
.tv-file-remove:hover { color: var(--err); }
.tv-file-move { background: none; border: none; color: var(--muted); cursor: grab; font-size: 0.8rem; padding: 0.15rem; }

/* ── Options panel ── */
.opts-panel { margin-top: 1rem; padding: 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); display: flex; flex-wrap: wrap; gap: 0.8rem; align-items: center; }
.opt-group { display: flex; align-items: center; gap: 0.4rem; }
.opt-label { font-size: 0.78rem; color: var(--muted); font-weight: 500; }
.opt-select, .opt-input { background: var(--surface-2); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius-xs); padding: 0.35rem 0.6rem; font: inherit; font-size: 0.8rem; outline: none; }
.opt-select:focus, .opt-input:focus { border-color: var(--accent); }
.opt-checkbox { accent-color: var(--accent); width: 14px; height: 14px; }

/* ── Action buttons ── */
.action-row { margin-top: 1.2rem; display: flex; gap: 0.6rem; flex-wrap: wrap; }
.btn-action { background: var(--accent); border: none; color: #fff; border-radius: var(--radius-sm); padding: 0.65rem 1.6rem; font: inherit; font-size: 0.9rem; font-weight: 700; cursor: pointer; transition: opacity 0.15s, box-shadow 0.15s, transform 0.15s; }
.btn-action:hover { opacity: 0.9; box-shadow: 0 6px 20px var(--accent-glow); transform: translateY(-1px); }
.btn-action:disabled { opacity: 0.35; cursor: not-allowed; transform: none; box-shadow: none; }

/* ── Results ── */
.result-area { margin-top: 1.2rem; }
.result-item { display: flex; align-items: center; gap: 0.6rem; padding: 0.7rem 1rem; border: 1px solid rgba(52,211,153,0.2); background: rgba(52,211,153,0.06); border-radius: var(--radius-sm); margin-bottom: 0.5rem; animation: fadeIn 0.2s ease both; }
.result-icon { font-size: 1rem; }
.result-name { flex: 1; font-size: 0.85rem; font-weight: 600; }
.result-dl { background: var(--ok); color: #000; border: none; border-radius: var(--radius-xs); padding: 0.3rem 0.8rem; font: inherit; font-size: 0.78rem; font-weight: 700; cursor: pointer; text-decoration: none; transition: opacity 0.15s; }
.result-dl:hover { opacity: 0.85; }

/* ── Status / Loader ── */
.status-bar { margin-top: 1rem; padding: 0.7rem 1rem; border-radius: var(--radius-sm); font-size: 0.82rem; font-weight: 500; }
.status-bar.loading { background: rgba(251,191,36,0.08); border: 1px solid rgba(251,191,36,0.2); color: var(--warn); }
.status-bar.ok { background: rgba(52,211,153,0.08); border: 1px solid rgba(52,211,153,0.2); color: var(--ok); }
.status-bar.error { background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.2); color: var(--err); }

.progress-bar { height: 5px; border-radius: 5px; background: rgba(255,255,255,0.06); margin-top: 0.5rem; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 5px; background: linear-gradient(90deg, var(--accent), var(--cyan)); transition: width 0.3s ease; width: 0%; }

/* ── Image preview grid ── */
.preview-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 0.5rem; margin-top: 0.8rem; }
.preview-thumb { border-radius: var(--radius-xs); border: 1px solid var(--border); object-fit: cover; width: 100%; height: 100px; background: repeating-conic-gradient(rgba(255,255,255,0.04) 0% 25%, transparent 0% 50%) 0/14px 14px; }

/* ── Ad Slots ── */
.ad-slot { margin: 1.5rem 0; border-radius: var(--radius); border: 1px dashed rgba(255,255,255,0.06); background: rgba(255,255,255,0.015); padding: 0.5rem 0.7rem 0.7rem; min-height: 90px; max-height: 140px; overflow: hidden; display: flex; flex-direction: column; align-items: center; gap: 0.3rem; }
.ad-label { font-size: 0.6rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.14); align-self: flex-start; }
.ad-slot .adsbygoogle { width: 100%; min-height: 90px; max-height: 110px; }
.ad-slot.ad-slot-empty { display: none; }

/* ── Utilities ── */
.hidden { display: none !important; }

/* ── API Status Badge ── */
.api-status { padding: 0.3rem 0.7rem; border-radius: 999px; font-size: 0.75rem; font-weight: 700; border: 1px solid var(--border); background: var(--surface); transition: all 0.3s; }
.api-status.checking { color: var(--warn); border-color: rgba(251,191,36,0.3); background: rgba(251,191,36,0.05); }
.api-status.up { color: var(--ok); border-color: rgba(52,211,153,0.3); background: rgba(52,211,153,0.05); box-shadow: 0 0 10px rgba(52,211,153,0.1); }
.api-status.down { color: var(--err); border-color: rgba(248,113,113,0.3); background: rgba(248,113,113,0.05); }

/* ── Floating Feedback Button ── */
.feedback-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1200;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.7rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  transition: all 0.3s ease;
}
.feedback-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
  box-shadow: 0 8px 32px var(--accent-glow);
  transform: translateY(-3px);
}
.feedback-btn:active { transform: translateY(0); }

/* ── Feedback Modal ── */
.feedback-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1300;
  display: none;
  align-items: center;
  justify-content: center;
}
.feedback-modal.active {
  display: flex;
}
.feedback-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: -1;
}
.feedback-modal-content {
  background: rgba(15, 15, 20, 0.65);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  width: min(500px, calc(100% - 2rem));
  max-height: 90vh;
  overflow-y: auto;
  z-index: 1;
}
.feedback-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.feedback-modal-header h2 {
  font-size: 1.3rem;
  margin: 0;
}
.feedback-modal-close {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}
.feedback-modal-close:hover {
  background: var(--surface-hover);
}

/* ── Feedback Form ── */
.feedback-form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.form-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.required {
  color: var(--rose);
}
.form-group input,
.form-group select,
.form-group textarea {
  background: rgba(255, 255, 255, 0.08);
  border: 1.5px solid var(--border);
  color: var(--text);
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted);
}
.form-group select {
  cursor: pointer;
}
.form-group select option {
  background: var(--bg);
  color: var(--text);
}
.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
  border-color: var(--accent-glow);
  background: rgba(255, 255, 255, 0.12);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: flex-end;
  padding-top: 0.5rem;
}
.btn-primary,
.btn-secondary {
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108, 99, 255, 0.3);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--surface-hover);
}

.feedback-status {
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.9rem;
  display: none;
}
.feedback-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  color: var(--ok);
  border: 1px solid rgba(16, 185, 129, 0.2);
}
.feedback-status.error {
  display: block;
  background: rgba(244, 63, 94, 0.1);
  color: var(--err);
  border: 1px solid rgba(244, 63, 94, 0.2);
}
.feedback-status.loading {
  display: block;
  background: rgba(6, 182, 212, 0.1);
  color: var(--cyan);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

@media (max-width: 520px) {
  .feedback-btn { bottom: 1rem; right: 1rem; padding: 0.5rem 0.9rem; font-size: 0.85rem; }
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 9px; }

/* ── Animations ── */
@keyframes orbFloat { from { transform: translate(0,0) scale(1); } to { transform: translate(20px,20px) scale(1.06); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeSlideUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }

/* ── Responsive ── */
@media (max-width: 520px) {
  #app { padding: 1.5rem 0 2rem; }
  .site-title { font-size: 1.3rem; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
  .tool-card { padding: 0.85rem; }
  .ad-slot { margin: 1rem 0; max-height: 120px; padding: 0.35rem 0.5rem 0.5rem; }
  .ad-slot .adsbygoogle { max-height: 96px; }
}

/* ── Organize PDF Grid ── */
.organize-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 1rem; margin-top: 1rem; padding: 1rem; background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius); min-height: 200px; }
.page-card { position: relative; background: #fff; border-radius: var(--radius-xs); padding: 0.5rem; display: flex; flex-direction: column; align-items: center; cursor: grab; transition: transform 0.2s, box-shadow 0.2s; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.page-card:active { cursor: grabbing; }
.page-card:hover { transform: translateY(-3px); box-shadow: 0 8px 15px rgba(0,0,0,0.2); }
.page-card.sortable-ghost { opacity: 0.4; }
.page-thumb { width: 100%; height: auto; border: 1px solid #ddd; object-fit: contain; background: #fafafa; border-radius: 4px; transition: transform 0.3s ease; }
.page-num { margin-top: 0.5rem; font-size: 0.75rem; color: #333; font-weight: 600; text-align: center; }
.page-controls { position: absolute; top: 5px; right: 5px; display: flex; gap: 0.3rem; opacity: 0; transition: opacity 0.2s; }
.page-card:hover .page-controls { opacity: 1; }
.btn-page-ctrl { background: rgba(0,0,0,0.7); color: #fff; border: none; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; cursor: pointer; transition: background 0.2s; }
.btn-page-ctrl:hover { background: var(--accent); }
.btn-page-ctrl.del:hover { background: var(--err); }