/* ── Reset ────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* ── Tokens ───────────────────────────────────────────── */
:root {
  --bg:        #09090f;
  --card:      rgba(255, 255, 255, 0.036);
  --border:    rgba(255, 255, 255, 0.082);
  --border-hi: rgba(255, 255, 255, 0.15);
  --accent:    #7c3aed;
  --accent-b:  #0ea5e9;
  --text:      #eeeef5;
  --muted:     #888899;
  --dim:       #3a3a50;
  --r:         20px;
  --rsm:       12px;
  --ease:      cubic-bezier(.22, 1, .36, 1);
}

/* ── Base ─────────────────────────────────────────────── */
html { font-size: 16px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Background glow ──────────────────────────────────── */
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 72% 52% at 50% -8%,  rgba(124,58,237,0.20) 0%, transparent 60%),
    radial-gradient(ellipse 50% 38% at 88% 92%,  rgba(14,165,233,0.11) 0%, transparent 55%);
}

/* ── Header ───────────────────────────────────────────── */
header {
  position: relative;
  z-index: 1;
  padding: 28px 40px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.025em;
  color: var(--text);
  user-select: none;
}

.logo-icon { width: 24px; height: 24px; color: var(--accent); }

/* ── Main ─────────────────────────────────────────────── */
main {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
  padding: 8px 24px 88px;
}

/* ── Hero ─────────────────────────────────────────────── */
.hero {
  text-align: center;
  margin-bottom: 44px;
  animation: fadeUp 0.6s var(--ease) both;
}

.hero h1 {
  font-size: clamp(1.9rem, 5.2vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.048em;
  line-height: 1.16;
  margin-bottom: 14px;
}

.hero h1 span {
  background: linear-gradient(115deg, #7c3aed 0%, #0ea5e9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p { color: var(--muted); font-size: 0.98rem; }

/* ── Card ─────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 28px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition: border-color 0.35s;
  animation: fadeUp 0.6s var(--ease) 0.07s both;
}

.card:hover { border-color: var(--border-hi); }

#fileInput { display: none; }

/* ── Upload zone ──────────────────────────────────────── */
.upload-zone {
  border: 1.5px dashed rgba(255,255,255,0.11);
  border-radius: var(--rsm);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
  position: relative;
  overflow: hidden;
}

.upload-zone::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, rgba(124,58,237,0.08), transparent);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.upload-zone:hover::after, .upload-zone.over::after { opacity: 1; }

.upload-zone:hover { border-color: rgba(124,58,237,0.5); background: rgba(124,58,237,0.025); }
.upload-zone.over  { border-color: var(--accent); background: rgba(124,58,237,0.055); transform: scale(1.008); }

.upload-icon-wrap {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124,58,237,0.1);
  border: 1px solid rgba(124,58,237,0.22);
  border-radius: 14px;
  color: var(--accent);
  transition: transform 0.3s var(--ease), background 0.3s;
}

.upload-icon-wrap svg { width: 26px; height: 26px; }
.upload-zone:hover .upload-icon-wrap { transform: translateY(-3px); background: rgba(124,58,237,0.17); }

.upload-title { font-size: 0.95rem; font-weight: 500; margin-bottom: 7px; }

.upload-sub { font-size: 0.84rem; color: var(--muted); margin-bottom: 14px; }

.browse-link {
  background: none; border: none; color: var(--accent); cursor: pointer;
  font: inherit; font-weight: 500; padding: 0;
  text-decoration: underline; text-underline-offset: 3px;
  transition: color 0.2s;
}
.browse-link:hover { color: #9d5ef3; }

.upload-types { font-size: 0.71rem; font-weight: 500; color: var(--dim); letter-spacing: 0.07em; text-transform: uppercase; }

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

/* ── Add-more strip ───────────────────────────────────── */
.add-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 16px;
  border: 1.5px dashed rgba(255,255,255,0.11);
  border-radius: var(--rsm);
  cursor: pointer;
  margin-bottom: 16px;
  transition: border-color 0.22s, background 0.22s;
  animation: fadeIn 0.3s ease both;
}

.add-strip:hover, .add-strip.over {
  border-color: rgba(124,58,237,0.5);
  background: rgba(124,58,237,0.03);
}

.add-strip-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.2s;
}

.add-strip:hover .add-strip-left { color: var(--text); }

.file-count {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* ── Image grid ───────────────────────────────────────── */
.img-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
  margin-bottom: 22px;
  max-height: 370px;
  overflow-y: auto;
  padding-right: 2px;
  animation: fadeIn 0.3s ease both;
}

.img-grid::-webkit-scrollbar { width: 4px; }
.img-grid::-webkit-scrollbar-thumb { background: var(--dim); border-radius: 2px; }

/* ── Image card ───────────────────────────────────────── */
.img-card {
  position: relative;
  aspect-ratio: 1;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  animation: scaleIn 0.28s var(--ease) both;
  transition: border-color 0.2s;
}

.img-card:hover { border-color: var(--border-hi); }

.img-card > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Remove button */
.btn-remove {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(9,9,15,0.72);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.75);
  transition: opacity 0.18s, transform 0.18s, background 0.18s, border-color 0.18s;
}

.img-card:hover .btn-remove { opacity: 1; transform: scale(1); }

.btn-remove:hover {
  background: rgba(220,38,38,0.82);
  border-color: rgba(220,38,38,0.5);
}

/* Hover info overlay */
.card-info {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 20px 7px 7px;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.img-card:hover .card-info { opacity: 1; }

.card-info p {
  font-size: 0.65rem;
  font-weight: 500;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;
}

.card-info .card-size { color: rgba(255,255,255,0.6); font-size: 0.6rem; }

/* Done overlay */
.card-done {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5,150,105,0.78);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card-done svg { color: #fff; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.25)); }
.img-card.done .card-done { opacity: 1; }

/* ── Divider ──────────────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 6px 0 22px;
  animation: fadeIn 0.3s ease both;
}

.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.divider span {
  font-size: 0.71rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

/* ── Format row ───────────────────────────────────────── */
.format-row {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
  animation: fadeIn 0.35s ease both;
}

.fmt {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 10px;
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: var(--rsm);
  cursor: pointer;
  font-family: inherit;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s;
}

.fmt::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124,58,237,0.13), rgba(14,165,233,0.13));
  opacity: 0;
  transition: opacity 0.2s;
}

.fmt:hover { border-color: rgba(124,58,237,0.48); }
.fmt:hover::before { opacity: 1; }

.fmt strong {
  position: relative;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.2s;
}

.fmt em {
  position: relative;
  font-style: normal;
  font-size: 0.67rem;
  font-weight: 500;
  color: var(--dim);
  transition: color 0.2s;
}

.fmt:hover strong { color: var(--text); }

.fmt.active { border-color: transparent; background: linear-gradient(130deg, #7c3aed, #0ea5e9); }
.fmt.active::before { display: none; }
.fmt.active strong { color: #fff; }
.fmt.active em     { color: rgba(255,255,255,0.68); }

/* ── Quality wrap ─────────────────────────────────────── */
.quality-wrap {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.38s var(--ease), opacity 0.32s ease, margin 0.38s var(--ease);
  margin-bottom: 0;
}

.quality-wrap.open { max-height: 80px; opacity: 1; margin-bottom: 22px; }

.quality-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.quality-row label { font-size: 0.82rem; font-weight: 500; color: var(--muted); }
.quality-row output { font-size: 0.82rem; font-weight: 600; color: var(--accent); font-variant-numeric: tabular-nums; }

/* ── Range slider ─────────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  background: linear-gradient(
    to right,
    var(--accent)           0%,
    var(--accent)           var(--pct, 84%),
    rgba(255,255,255,0.10)  var(--pct, 84%),
    rgba(255,255,255,0.10)  100%
  );
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(124,58,237,0.30), 0 2px 6px rgba(0,0,0,0.35);
  transition: box-shadow 0.2s, transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px rgba(124,58,237,0.25), 0 2px 8px rgba(0,0,0,0.3);
  transform: scale(1.12);
}

input[type="range"]::-moz-range-track { height: 4px; background: rgba(255,255,255,0.1); border-radius: 2px; }
input[type="range"]::-moz-range-progress { background: var(--accent); height: 4px; border-radius: 2px; }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border: none; border-radius: 50%;
  background: #fff; box-shadow: 0 0 0 3px rgba(124,58,237,0.30); cursor: pointer;
}

/* ── Convert button ───────────────────────────────────── */
.btn-convert {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  background: linear-gradient(115deg, #7c3aed 0%, #0ea5e9 100%);
  border: none;
  border-radius: var(--rsm);
  color: #fff;
  font: 600 0.95rem/1 'Inter', sans-serif;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.22s var(--ease), box-shadow 0.22s, opacity 0.2s;
  animation: fadeIn 0.35s ease both;
}

.btn-convert::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.10);
  opacity: 0;
  transition: opacity 0.2s;
}

.btn-convert:not(:disabled):hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(124,58,237,0.45); }
.btn-convert:not(:disabled):hover::before { opacity: 1; }
.btn-convert:active { transform: translateY(0); box-shadow: none; }
.btn-convert:disabled { opacity: 0.65; cursor: not-allowed; }

.btn-convert.done { background: linear-gradient(115deg, #059669 0%, #10b981 100%); }

/* ── Pills ────────────────────────────────────────────── */
.pills {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  animation: fadeUp 0.6s var(--ease) 0.16s both;
}

.pill {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--muted);
  backdrop-filter: blur(10px);
}

.pill svg { flex-shrink: 0; opacity: 0.65; }

/* ── Animations ───────────────────────────────────────── */
@keyframes fadeUp  { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.82); } to { opacity: 1; transform: scale(1); } }

/* ── Scrollbar ────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--dim); border-radius: 3px; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 540px) {
  header { padding: 20px; }
  main   { padding: 6px 16px 64px; }
  .hero  { margin-bottom: 32px; }
  .card  { padding: 20px; border-radius: 16px; }
  .upload-zone { padding: 40px 16px; }
  .img-grid { grid-template-columns: repeat(auto-fill, minmax(82px, 1fr)); }
  .pills { gap: 8px; }
  .pill  { font-size: 0.72rem; padding: 7px 12px; }
}