/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242736;
  --accent: #6c63ff;
  --accent2: #00d4aa;
  --text: #e8eaf0;
  --text-muted: #8b8fa8;
  --border: #2e3147;
  --success: #00d4aa;
  --error: #ff6b6b;
  --warning: #ffb347;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
  background: linear-gradient(135deg, #1a1d27 0%, #0f1117 100%);
  border-bottom: 1px solid var(--border);
}
header h1 { font-size: 2rem; font-weight: 700; margin-bottom: .3rem; }
header p { color: var(--text-muted); font-size: .95rem; }

main {
  max-width: 860px;
  margin: 2rem auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ===== TYPE GRID ===== */
.type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .75rem;
}
.type-grid.four-cols { grid-template-columns: repeat(4, 1fr); }
.type-btn {
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem .75rem;
  cursor: pointer;
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .3rem;
  transition: all .2s;
}
.type-btn:hover { border-color: var(--accent); transform: translateY(-2px); }
.type-btn.active { border-color: var(--accent); background: rgba(108,99,255,.12); }
.type-btn .icon { font-size: 1.8rem; }
.type-btn strong { font-size: .9rem; }
.type-btn small { font-size: .75rem; color: var(--text-muted); text-align: center; }

/* ===== DROP ZONE ===== */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(108,99,255,.06);
}
.drop-zone.drop-ok { border-color: var(--success); background: rgba(0,212,170,.05); }
.drop-zone.drop-error { border-color: var(--error); background: rgba(255,107,107,.05); }
.drop-icon { font-size: 2.5rem; }
.link { color: var(--accent); cursor: pointer; text-decoration: underline; }
.hint { font-size: .8rem; color: var(--text-muted); }

/* ===== UPLOAD STATUS ===== */
.upload-status {
  margin-top: 1rem;
  display: grid;
  gap: .5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .9rem 1rem;
  transition: border-color .3s;
}
.upload-status.ok { border-color: var(--success); }
.upload-status.error { border-color: var(--error); }

.upload-feedback {
  font-size: .9rem;
  font-weight: 600;
  min-height: 1.2rem;
}
.upload-feedback.ok { color: var(--success); }
.upload-feedback.error { color: var(--error); }
.upload-feedback.loading { color: var(--text-muted); }

.upload-progress-label {
  font-size: .78rem;
  color: var(--text-muted);
}

#uploadProgress {
  width: 100%;
  height: 10px;
  appearance: none;
  -webkit-appearance: none;
  border: none;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
#uploadProgress::-webkit-progress-bar {
  background: var(--border);
  border-radius: 999px;
}
#uploadProgress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 999px;
  transition: width .2s;
}
#uploadProgress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 999px;
}

#uploadProgressText {
  font-size: .78rem;
  color: var(--text-muted);
}

/* ===== PREVIEW ===== */
.preview-wrap {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  flex-wrap: wrap;
}
#previewImg {
  max-width: 180px;
  max-height: 180px;
  border-radius: 8px;
  border: 1px solid var(--border);
  object-fit: contain;
  background: var(--surface2);
}
.file-meta {
  flex: 1;
  font-size: .85rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: .3rem;
}
.file-meta span { color: var(--text); }
.badge {
  display: inline-block;
  background: rgba(108,99,255,.2);
  color: var(--accent);
  border-radius: 20px;
  padding: .15rem .6rem;
  font-size: .75rem;
  font-weight: 600;
}

/* ===== OPTIONS ===== */
.options-panel {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.options-panel label {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .9rem;
  color: var(--text-muted);
}
.options-panel label span { color: var(--accent2); font-weight: 700; }
.options-panel select,
.options-panel input[type="number"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .45rem .7rem;
  color: var(--text);
  font-size: .9rem;
  outline: none;
  transition: border-color .2s;
}
.options-panel select:focus,
.options-panel input[type="number"]:focus { border-color: var(--accent); }
.options-panel input[type="range"] { accent-color: var(--accent); cursor: pointer; }
.toggle-wrap { flex-direction: row !important; align-items: center; gap: .5rem !important; }
.toggle-wrap input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }

/* ===== CONVERT BUTTON ===== */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: .85rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  width: 100%;
}
.btn-primary:hover:not(:disabled) { background: #7c75ff; transform: translateY(-1px); }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; }

/* ===== PROCESSING PROGRESS ===== */
.progress-wrap {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}
.progress-bar::after {
  content: '';
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .3s;
}
.progress-bar.indeterminate::after {
  width: 40%;
  animation: indeterminate 1.2s ease-in-out infinite;
}
@keyframes indeterminate {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}
#progressText { font-size: .85rem; color: var(--text-muted); }

/* ===== RESULTS ===== */
.results-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.result-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  flex-wrap: wrap;
}
.result-preview img {
  max-width: 120px;
  max-height: 120px;
  border-radius: 6px;
  border: 1px solid var(--border);
  object-fit: contain;
  background: repeating-conic-gradient(#333 0% 25%, #444 0% 50%) 0 0/16px 16px;
}
.compare-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(100px, 160px));
  gap: .75rem;
  align-items: start;
}
.compare-card { display: flex; flex-direction: column; gap: .3rem; }
.compare-card span { font-size: .75rem; color: var(--text-muted); }
.compare-card img {
  max-width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
  object-fit: contain;
  background: repeating-conic-gradient(#333 0% 25%, #444 0% 50%) 0 0/16px 16px;
}
.result-info { flex: 1; display: flex; flex-direction: column; gap: .4rem; min-width: 0; }
.result-info h3 { font-size: .9rem; font-weight: 600; }
.result-stats { display: flex; gap: .5rem; flex-wrap: wrap; font-size: .8rem; }
.stat { background: rgba(0,212,170,.12); color: var(--accent2); border-radius: 20px; padding: .15rem .6rem; }
.stat.warn { background: rgba(255,179,71,.12); color: var(--warning); }
.result-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .3rem; }
.btn-sm {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .35rem .8rem;
  color: var(--text);
  font-size: .8rem;
  cursor: pointer;
  transition: all .15s;
}
.btn-sm:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm.primary { border-color: var(--accent); color: var(--accent); }
.code-block {
  background: #0d0f1a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .75rem 1rem;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: .75rem;
  color: #a8e6cf;
  overflow-x: auto;
  white-space: pre;
  margin-top: .5rem;
  max-height: 160px;
  overflow-y: auto;
  display: none;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: .85rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}
footer a { color: var(--accent); text-decoration: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 800px) {
  .type-grid.four-cols { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .type-grid, .type-grid.four-cols { grid-template-columns: 1fr; }
  .preview-wrap { flex-direction: column; }
  .result-item { flex-direction: column; }
  .compare-row { grid-template-columns: 1fr; }
}