:root {
  --bg-0: #07090f;
  --bg-1: #0b0f1a;
  --bg-2: #0f1525;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --fg: #f1f5f9;
  --fg-soft: #cbd5e1;
  --muted: #94a3b8;
  --muted-2: #64748b;
  --accent: #60a5fa;
  --accent-2: #818cf8;
  --accent-3: #22d3ee;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,.35), 0 1px 2px rgba(0,0,0,.4);
  --shadow-lg: 0 24px 64px rgba(0,0,0,.45), 0 8px 24px rgba(0,0,0,.3);
  --ease: cubic-bezier(.22,.61,.36,1);
}

* { box-sizing: border-box; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: rgba(255,255,255,.08); border-radius: 999px; }
*::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.16); }

html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }
body {
  position: relative;
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11";
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.005em;
  background: var(--bg-0);
  min-height: 100dvh;
  padding:
    env(safe-area-inset-top)
    env(safe-area-inset-right)
    calc(env(safe-area-inset-bottom) + 32px)
    env(safe-area-inset-left);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Animated ambient background */
body::before, body::after {
  content: "";
  position: fixed;
  inset: -20% -20% auto auto;
  width: 70vw;
  height: 70vw;
  border-radius: 50%;
  filter: blur(120px);
  opacity: .35;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(circle at 30% 30%, #1d4ed8 0%, transparent 60%);
  animation: drift 22s var(--ease) infinite alternate;
}
body::after {
  inset: auto auto -20% -20%;
  background: radial-gradient(circle at 60% 60%, #0e7490 0%, transparent 60%);
  animation-duration: 28s;
  animation-direction: alternate-reverse;
}
@keyframes drift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(-8%, 6%) scale(1.1); }
}
@media (prefers-reduced-motion: reduce) {
  body::before, body::after { animation: none; }
}

/* layout */
header {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 24px 8px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  box-shadow: 0 6px 18px rgba(96,165,250,.4), inset 0 1px 0 rgba(255,255,255,.25);
}
.brand-mark svg { color: #fff; }
.brand-text h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.brand-text p { margin: 0; font-size: 13px; color: var(--muted); }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 16px 24px 0;
  display: grid;
  gap: 28px;
}

/* Drop zone */
.drop {
  position: relative;
  border-radius: var(--radius);
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  outline: none;
  background:
    linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01)),
    var(--bg-1);
  border: 1px solid var(--border);
  transition: transform .25s var(--ease), border-color .2s, background .2s;
  overflow: hidden;
  isolation: isolate;
}
.drop::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, transparent 30%, rgba(96,165,250,.5) 50%, transparent 70%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .25s var(--ease);
  pointer-events: none;
  z-index: 1;
}
.drop:hover { border-color: var(--border-strong); background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02)), var(--bg-2); }
.drop:focus-visible { border-color: var(--accent); }
.drop.over {
  transform: scale(1.01);
  border-color: var(--accent);
}
.drop.over::before { opacity: 1; }

.drop-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(96,165,250,.2), rgba(34,211,238,.1));
  border: 1px solid rgba(96,165,250,.3);
  display: grid;
  place-items: center;
  color: var(--accent);
  transition: transform .3s var(--ease);
}
.drop.over .drop-icon { transform: translateY(-2px) scale(1.05); }
.drop-title {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.drop-sub { margin: 0; color: var(--muted); font-size: 14px; }
.drop-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
}
.drop-hint kbd {
  display: inline-block;
  font: 600 11px/1 ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 2px 5px;
  color: var(--fg-soft);
}

.drop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 18px;
}
.btn.btn-pill {
  width: auto;
  height: 38px;
  padding: 0 16px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-2);
}
.btn.btn-pill:hover { background: rgba(96,165,250,.12); border-color: rgba(96,165,250,.4); color: var(--fg); }
.btn.btn-pill svg { width: 14px; height: 14px; }

/* sections */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 12px;
}
.section-head h2 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0;
}
.section-head .count {
  font-size: 12px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}

ul.list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }

/* row card */
.row {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color .2s, background .2s, transform .2s var(--ease);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
}
.row:hover { border-color: var(--border-strong); background: var(--surface-2); }
.row.queue.done { border-color: rgba(52,211,153,.35); }
.row.queue.error { border-color: rgba(248,113,113,.4); }

/* thumbnail */
.thumb {
  width: 64px;
  height: 64px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
  cursor: pointer;
}
.thumb img,
.thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.thumb .icon-fallback {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.thumb .icon-fallback svg { color: var(--accent); margin-bottom: 4px; }
.thumb .badge {
  position: absolute;
  bottom: 4px;
  right: 4px;
  background: rgba(0,0,0,.7);
  color: #fff;
  border-radius: 4px;
  padding: 1px 4px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  backdrop-filter: blur(6px);
}
.thumb .play {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0,0,0,.25);
  color: #fff;
  pointer-events: none;
}
.row.queue .thumb { cursor: default; }
.row.queue.done .thumb { cursor: pointer; }

/* row info */
.info { min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.info .name {
  font-weight: 500;
  font-size: 14.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--fg);
  letter-spacing: -.005em;
}
.info .meta {
  font-size: 12.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.info .meta .dot { margin: 0 6px; opacity: .5; }

/* progress bar */
.progress {
  margin-top: 8px;
  height: 4px;
  background: rgba(255,255,255,.06);
  border-radius: 999px;
  overflow: hidden;
  grid-column: 1 / -1;
}
.progress > span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  border-radius: inherit;
  transition: width .15s linear;
  box-shadow: 0 0 12px rgba(96,165,250,.5);
}
.row.error .progress > span { background: var(--err); box-shadow: none; }
.row.done .progress > span { background: linear-gradient(90deg, var(--ok), #6ee7b7); box-shadow: 0 0 12px rgba(52,211,153,.4); }

.status {
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
}
.row.error .status { color: var(--err); }
.row.done .status { color: var(--ok); }
.status .spinner {
  width: 10px;
  height: 10px;
  border: 1.5px solid rgba(255,255,255,.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  flex-shrink: 0;
}
.row.done .status .spinner,
.row.error .status .spinner { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* actions */
.actions { display: flex; gap: 4px; }
.btn {
  appearance: none;
  background: var(--surface);
  color: var(--fg-soft);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0;
  font: inherit;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, transform .08s;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.btn:hover { background: var(--surface-2); border-color: var(--border-strong); color: var(--fg); }
.btn:active { transform: scale(.93); }
.btn.danger:hover { background: rgba(248,113,113,.12); border-color: rgba(248,113,113,.35); color: var(--err); }
.btn svg { width: 16px; height: 16px; }
.btn-text {
  width: auto;
  padding: 0 12px;
  height: 36px;
  font-size: 13px;
}

.refresh-btn { width: 28px; height: 28px; border-radius: 8px; }
.refresh-btn svg { width: 14px; height: 14px; }

.empty {
  text-align: center;
  padding: 32px 20px;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
}
.empty svg { color: var(--muted-2); margin-bottom: 8px; }
.empty p { margin: 0; font-size: 14px; }

/* lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(2,4,10,.92);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  z-index: 100;
  display: grid;
  grid-template-rows: auto 1fr auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s var(--ease);
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  padding-top: max(14px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,.3);
}
.lightbox-head .name {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lightbox-head .meta { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.lightbox-body {
  display: grid;
  place-items: center;
  padding: 20px;
  overflow: auto;
  min-height: 0;
}
.lightbox-body > * { max-width: 100%; max-height: 100%; }
.lightbox-body img,
.lightbox-body video {
  max-width: min(100%, 1400px);
  max-height: 80vh;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  background: #000;
}
.lightbox-body iframe,
.lightbox-body embed {
  width: min(100%, 1100px);
  height: 80vh;
  background: #fff;
  border: 0;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}
.lightbox-body .unsupported {
  text-align: center;
  color: var(--muted);
  padding: 40px;
}
.lightbox-body .unsupported svg { color: var(--accent); }
.lightbox-body .unsupported p { margin: 12px 0 16px; }
.lightbox-foot {
  padding: 14px 20px;
  padding-bottom: max(14px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.3);
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

/* toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: max(20px, calc(env(safe-area-inset-bottom) + 12px));
  transform: translateX(-50%) translateY(20px);
  background: rgba(15, 21, 37, .92);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s var(--ease), transform .2s var(--ease);
  max-width: calc(100vw - 32px);
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* folder group */
.folder-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  transition: border-color .2s;
}
.folder-group:hover { border-color: var(--border-strong); }
.folder-head {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px;
  cursor: pointer;
  user-select: none;
  transition: background .15s;
}
.folder-head:hover { background: rgba(255,255,255,.03); }
.folder-icon {
  width: 64px;
  height: 64px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(129,140,248,.18), rgba(96,165,250,.1));
  border: 1px solid rgba(129,140,248,.28);
  display: grid;
  place-items: center;
  color: var(--accent-2);
  position: relative;
}
.folder-icon .chevron {
  position: absolute;
  bottom: 4px;
  right: 4px;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: rgba(0,0,0,.5);
  color: #fff;
  display: grid;
  place-items: center;
  transition: transform .25s var(--ease);
}
.folder-group.collapsed .folder-icon .chevron { transform: rotate(-90deg); }
.folder-files {
  border-top: 1px solid var(--border);
  padding: 8px 12px 12px;
  display: grid;
  gap: 8px;
  background: rgba(0,0,0,.2);
  transition: max-height .25s var(--ease), opacity .2s;
  max-height: 9999px;
}
.folder-group.collapsed .folder-files {
  max-height: 0;
  overflow: hidden;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
}
.folder-files .row {
  border-radius: 10px;
  background: var(--surface);
  padding: 8px 10px;
  grid-template-columns: 44px 1fr auto;
  gap: 12px;
}
.folder-files .row:hover { background: var(--surface-2); }
.folder-files .thumb { width: 44px; height: 44px; }
.folder-files .info .name { font-size: 13.5px; }
.folder-files .info .meta { font-size: 11.5px; }
.folder-files .btn { width: 30px; height: 30px; border-radius: 8px; }

@media (max-width: 600px) {
  .folder-head { grid-template-columns: 56px 1fr auto; gap: 12px; padding: 10px; }
  .folder-icon { width: 56px; height: 56px; }
  .folder-files { padding: 6px 10px 10px; }
  .folder-files .row { grid-template-columns: 40px 1fr auto; }
  .folder-files .thumb { width: 40px; height: 40px; }
}

/* row enter animation */
@keyframes rowIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
.row { animation: rowIn .25s var(--ease); }

/* small screens */
@media (max-width: 600px) {
  header { padding: 28px 18px 4px; }
  main { padding: 12px 18px 0; gap: 22px; }
  .drop { padding: 36px 18px; }
  .row { padding: 10px; gap: 12px; grid-template-columns: 56px 1fr auto; }
  .thumb { width: 56px; height: 56px; }
  .info .name { font-size: 14px; }
  .info .meta { font-size: 12px; }
  .lightbox-body { padding: 12px; }
  .lightbox-body img,
  .lightbox-body video { max-height: 70vh; }
  .lightbox-body iframe,
  .lightbox-body embed { height: 70vh; }
}