:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #1e222b;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-2: #1d4ed8;
  --border: #e5e7eb;
  --success: #16a34a;
  --danger: #dc2626;
  --warn: #b45309;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

h1 {
  font-weight: 700;
  font-size: 24px;
  margin: 0 0 16px;
}

.field {
  margin: 16px 0;
}

.label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

input[type="file"],
select,
input[type="range"] {
  width: 100%;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  outline: none;
  box-shadow: var(--shadow);
}

input[type="range"] {
  appearance: none;
  height: 36px;
  padding: 0 10px;
  background: linear-gradient(to right, #eef2ff, #ffffff);
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: #e5e7eb;
  border-radius: 999px;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
  margin-top: -6px;
  box-shadow: 0 1px 2px rgba(0,0,0,.2);
}
input[type="range"]::-moz-range-track {
  height: 6px;
  background: #e5e7eb;
  border-radius: 999px;
}
input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
  border: none;
  box-shadow: 0 1px 2px rgba(0,0,0,.2);
}

.checkbox label {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0 8px;
}

button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--primary);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: background .2s ease, transform .05s ease;
  box-shadow: var(--shadow);
}

button:hover { background: var(--primary-2); }
button:disabled { opacity: .6; cursor: not-allowed; }

.notice {
  margin: 8px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px dashed var(--warn);
  color: var(--warn);
  font-size: 14px;
  background: #fff7ed;
}

.results {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 12px;
}

@media (min-width: 640px) {
  .results {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1024px) {
  .results {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  gap: 8px;
  box-shadow: var(--shadow);
}

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
}

.meta {
  font-size: 12px;
  color: var(--muted);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef2ff;
  color: #1e3a8a;
  font-size: 11px;
  border: 1px solid #c7d2fe;
}

.size {
  color: var(--success);
}

.error {
  color: var(--danger);
}

.thumb {
  width: 100%;
  height: 160px;
  object-fit: contain;
  background: #f3f4f6;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.sep { height: 1px; background: var(--border); margin: 4px 0; }

.btn-secondary {
  background: #f3f4f6;
  color: #111827;
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: #e5e7eb;
}

/* Loader */
.loader[hidden] { display: none !important; }
.loader {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,.6);
  backdrop-filter: blur(2px);
  display: grid;
  place-items: center;
  z-index: 9999;
}
.loader-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 10px;
  min-width: 240px;
  justify-items: center;
}
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid #e5e7eb;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
.loader-text {
  font-weight: 600;
}
.loader-hint {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}