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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f0f2f5;
  min-height: 100vh;
  color: #1f2937;
}

/* ── Top Nav ── */
.topnav {
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 52px;
  gap: 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.topnav .logo {
  font-size: 15px;
  font-weight: 700;
  color: #6366f1;
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.3px;
}
.topnav .nav-links {
  display: flex;
  gap: 2px;
  overflow-x: auto;
}
.topnav .nav-links a {
  font-size: 13px;
  color: #6b7280;
  text-decoration: none;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.topnav .nav-links a:hover { color: #6366f1; background: #f5f3ff; }
.topnav .nav-links a.active { color: #6366f1; background: #ede9fe; font-weight: 600; }

/* ── Page Layout ── */
.page {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 16px 48px;
}
.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.07);
  padding: 32px 36px;
  width: 100%;
  max-width: 600px;
}
.card-wide { max-width: 720px; }

.card h1 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.card .subtitle { font-size: 13px; color: #6b7280; margin-bottom: 24px; }

/* ── Drop Zone ── */
.drop-zone {
  border: 2px dashed #d1d5db;
  border-radius: 12px;
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  background: #fafafa;
  position: relative;
  transition: border-color 0.2s, background 0.2s;
}
.drop-zone:hover, .drop-zone.drag-over { border-color: #6366f1; background: #f5f3ff; }
.drop-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop-icon { font-size: 40px; margin-bottom: 8px; }
.drop-text { font-size: 14px; font-weight: 600; color: #374151; margin-bottom: 3px; }
.drop-hint { font-size: 12px; color: #9ca3af; }

/* ── File Item (for lists) ── */
.file-list { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 9px;
  padding: 10px 12px;
  cursor: grab;
  transition: box-shadow 0.15s, background 0.15s;
  user-select: none;
}
.file-item:hover { background: #f5f3ff; border-color: #c4b5fd; }
.file-item.dragging { opacity: 0.4; }
.file-item.drag-target { border-color: #6366f1; background: #ede9fe; }
.file-item .drag-handle { color: #d1d5db; font-size: 16px; cursor: grab; }
.file-item .fi-icon { font-size: 22px; }
.file-item .fi-details { flex: 1; overflow: hidden; }
.file-item .fi-name { font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-item .fi-meta { font-size: 11px; color: #9ca3af; margin-top: 1px; }
.file-item .fi-remove { background: none; border: none; color: #9ca3af; cursor: pointer; font-size: 15px; padding: 3px; border-radius: 4px; }
.file-item .fi-remove:hover { color: #ef4444; }

/* ── Sections / Options ── */
.section { margin-top: 20px; }
.section-title { font-size: 11px; font-weight: 700; color: #9ca3af; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px; }

.slider-group { margin-bottom: 14px; }
.slider-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 5px; }
.slider-label { font-size: 13px; color: #374151; font-weight: 500; }
.slider-value { font-size: 12px; font-weight: 700; color: #6366f1; background: #ede9fe; padding: 2px 8px; border-radius: 6px; min-width: 48px; text-align: center; }

input[type="range"] { -webkit-appearance: none; width: 100%; height: 5px; border-radius: 5px; background: #e5e7eb; outline: none; cursor: pointer; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 17px; height: 17px; border-radius: 50%; background: #6366f1; cursor: pointer; box-shadow: 0 1px 4px rgba(99,102,241,0.35); }

.toggle-row { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; }
.toggle-label { font-size: 13px; color: #4b5563; }
.toggle { position: relative; width: 36px; height: 20px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track { position: absolute; inset: 0; background: #d1d5db; border-radius: 20px; cursor: pointer; transition: 0.2s; }
.toggle-track::before { content: ''; position: absolute; width: 14px; height: 14px; background: white; border-radius: 50%; left: 3px; top: 3px; transition: 0.2s; }
input:checked + .toggle-track { background: #6366f1; }
input:checked + .toggle-track::before { transform: translateX(16px); }

/* ── Presets ── */
.presets { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 16px; }
.preset-btn { flex: 1; min-width: 72px; padding: 7px 4px; border: 1.5px solid #e5e7eb; border-radius: 8px; background: #fff; cursor: pointer; text-align: center; transition: all 0.15s; }
.preset-btn:hover { border-color: #6366f1; background: #f5f3ff; }
.preset-btn.active { border-color: #6366f1; background: #ede9fe; }
.preset-name { font-size: 12px; font-weight: 600; color: #374151; }
.preset-desc { font-size: 10px; color: #9ca3af; margin-top: 1px; }
.preset-btn.active .preset-name { color: #4f46e5; }

/* ── Main Button ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 11px 20px;
  border: none; border-radius: 9px;
  font-size: 14px; font-weight: 600;
  cursor: pointer; transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: #6366f1; color: #fff; width: 100%; margin-top: 18px; }
.btn-primary:hover:not(:disabled) { background: #4f46e5; }
.btn-primary:disabled { background: #a5b4fc; cursor: not-allowed; }
.btn-success { background: #059669; color: #fff; width: 100%; }
.btn-success:hover { background: #047857; }
.btn-gray { background: #e5e7eb; color: #374151; }
.btn-gray:hover { background: #d1d5db; }

/* ── Progress ── */
.progress-area { display: none; margin-top: 16px; }
.progress-area.show { display: block; }
.progress-bar-wrap { background: #e5e7eb; border-radius: 6px; height: 7px; overflow: hidden; }
.progress-bar { height: 100%; background: linear-gradient(90deg, #6366f1, #8b5cf6); border-radius: 6px; width: 0%; transition: width 0.4s ease; }
.progress-text { font-size: 12px; color: #6b7280; text-align: center; margin-top: 7px; }

/* ── Result ── */
.result { display: none; margin-top: 20px; border-radius: 12px; overflow: hidden; border: 1px solid #e5e7eb; }
.result.show { display: block; }
.result-header { padding: 13px 18px; display: flex; align-items: center; gap: 9px; }
.result-header.ok   { background: #ecfdf5; }
.result-header.warn { background: #fffbeb; }
.result-header.fail { background: #fef2f2; }
.result-icon  { font-size: 20px; }
.result-title { font-size: 14px; font-weight: 600; }
.result-header.ok   .result-title { color: #065f46; }
.result-header.warn .result-title { color: #92400e; }
.result-header.fail .result-title { color: #991b1b; }
.result-body { padding: 16px 18px; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; margin-bottom: 13px; }
.stat-box { text-align: center; padding: 9px 6px; background: #f9fafb; border-radius: 8px; }
.stat-value { font-size: 16px; font-weight: 700; }
.stat-value.green { color: #059669; }
.stat-value.red   { color: #dc2626; }
.stat-label { font-size: 10px; color: #9ca3af; margin-top: 2px; }

.method-tag { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 20px; margin-bottom: 10px; }
.method-tag.dpi    { background: #ede9fe; color: #5b21b6; }
.method-tag.stream { background: #dbeafe; color: #1e40af; }

.info-row { font-size: 12px; color: #6b7280; text-align: center; margin-bottom: 10px; }
.info-row strong { color: #374151; }

.error-msg { font-size: 13px; color: #991b1b; }

/* ── Paste Toast ── */
.paste-toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 9999;
  background: #1f2937; color: #fff;
  padding: 10px 16px; border-radius: 10px;
  font-size: 13px; font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  opacity: 0; transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
}
.paste-toast.show { opacity: 1; transform: translateY(0); }