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

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-success: #16a34a;
  --color-success-light: #f0fdf4;
  --color-danger: #dc2626;
  --color-danger-light: #fef2f2;
  --color-warning: #d97706;
  --color-warning-light: #fffbeb;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
  --transition: 0.15s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-gray-800);
  background: var(--color-gray-50);
  min-height: 100vh;
}

/* ===== Layout ===== */
#app { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; }

/* ===== Header ===== */
.header {
  background: #fff;
  border-bottom: 1px solid var(--color-gray-200);
  margin: 0 -16px 24px;
  padding: 14px 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner { max-width: 760px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.header-title { display: flex; align-items: center; gap: 8px; }
.header-icon { font-size: 22px; }
.header-title h1 { font-size: 19px; font-weight: 700; color: var(--color-gray-900); }
.header-badges { display: flex; gap: 6px; flex-wrap: wrap; }

/* ===== Badges ===== */
.badge {
  display: inline-flex; align-items: center; gap: 3px;
  font-size: 11px; font-weight: 600;
  padding: 3px 8px; border-radius: 99px;
  white-space: nowrap;
}
.badge-green { background: var(--color-success-light); color: var(--color-success); }
.badge-blue { background: var(--color-primary-light); color: var(--color-primary); }
.badge-gray { background: var(--color-gray-100); color: var(--color-gray-500); }
.badge-gray:hover { background: var(--color-gray-200); color: var(--color-gray-700); }
.badge-orange { background: var(--color-warning-light); color: var(--color-warning); }
.badge-red { background: var(--color-danger-light); color: var(--color-danger); }

/* ===== Dropzone ===== */
.dropzone {
  background: #fff;
  border: 2.5px dashed var(--color-gray-300);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  outline: none;
}
.dropzone:hover, .dropzone:focus {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}
.dropzone.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  border-style: solid;
}
.dropzone.has-files {
  padding: 16px 20px;
  border-style: solid;
  border-color: var(--color-gray-200);
}
.dropzone-content { pointer-events: none; }
.dropzone-icon { font-size: 40px; margin-bottom: 10px; }
.dropzone-primary { font-size: 16px; font-weight: 600; color: var(--color-gray-700); margin-bottom: 6px; }
.dropzone-secondary { font-size: 13px; color: var(--color-gray-500); margin-bottom: 6px; }
.dropzone-link { color: var(--color-primary); text-decoration: underline; }
.dropzone-formats { font-size: 12px; color: var(--color-gray-400); }

/* ===== Preset ===== */
.preset-section {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin: 16px 0;
}
.preset-label { font-size: 13px; font-weight: 600; color: var(--color-gray-600); white-space: nowrap; }
.preset-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.preset-btn {
  display: flex; flex-direction: column; align-items: center;
  padding: 8px 14px;
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: 13px; font-weight: 600;
  color: var(--color-gray-600);
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.3;
}
.preset-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}
.preset-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}
.preset-desc {
  font-size: 11px; font-weight: 400;
  opacity: 0.8;
  margin-top: 2px;
}
.preset-btn.active .preset-desc { opacity: 1; }

/* ===== File List ===== */
.file-list-section {
  background: #fff;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
}
.file-list-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-gray-100);
  background: var(--color-gray-50);
}
.file-list-title { font-size: 13px; font-weight: 600; color: var(--color-gray-600); }
.btn-text-danger {
  font-size: 12px; color: var(--color-danger);
  background: none; border: none; cursor: pointer; padding: 2px 6px;
}
.btn-text-danger:hover { text-decoration: underline; }

.file-list { list-style: none; }
.file-item {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-gray-100);
  transition: background var(--transition);
}
.file-item:last-child { border-bottom: none; }
.file-item:hover { background: var(--color-gray-50); }

.file-thumb {
  width: 48px; height: 48px;
  border-radius: 5px;
  object-fit: cover;
  background: var(--color-gray-100);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  overflow: hidden;
}
.file-thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 5px; }

.file-info { min-width: 0; }
.file-name {
  font-size: 13px; font-weight: 500;
  color: var(--color-gray-800);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  margin-bottom: 3px;
}
.file-meta {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-size: 12px; color: var(--color-gray-500);
}
.file-size-arrow { color: var(--color-gray-300); }
.file-size-result { font-weight: 600; color: var(--color-gray-700); }
.file-size-result.done { color: var(--color-success); }

.reduction-badge {
  display: inline-flex; align-items: center;
  font-size: 11px; font-weight: 700;
  padding: 2px 6px; border-radius: 99px;
  background: var(--color-success-light);
  color: var(--color-success);
}

.file-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.btn-icon {
  width: 28px; height: 28px;
  border-radius: 5px;
  border: 1px solid var(--color-gray-200);
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.btn-icon:hover { background: var(--color-gray-100); }
.btn-download {
  width: auto; padding: 4px 10px;
  font-size: 12px; font-weight: 600;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-download:hover { background: var(--color-primary-light); }

.file-item.processing .file-name::after {
  content: '';
  display: inline-block;
  width: 12px; height: 12px;
  border: 2px solid var(--color-gray-300);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: 6px;
  vertical-align: middle;
}
.file-item.error .file-name { color: var(--color-danger); }
.file-item.done .file-thumb { outline: 2px solid var(--color-success); outline-offset: 1px; }

.file-summary {
  padding: 10px 14px;
  font-size: 13px; color: var(--color-gray-600);
  background: var(--color-gray-50);
  border-top: 1px solid var(--color-gray-100);
}

/* ===== Action Section ===== */
.action-section { display: flex; justify-content: center; margin: 12px 0; }

/* ===== Progress ===== */
.progress-section { margin: 12px 0; }
.progress-bar-wrap {
  height: 8px; background: var(--color-gray-200);
  border-radius: 99px; overflow: hidden; margin-bottom: 8px;
}
.progress-bar {
  height: 100%; background: var(--color-primary);
  border-radius: 99px;
  transition: width 0.3s ease;
}
.progress-text { font-size: 13px; color: var(--color-gray-500); text-align: center; }

/* ===== Result Summary ===== */
.result-summary {
  background: var(--color-success-light);
  border: 1.5px solid #86efac;
  border-radius: var(--radius);
  padding: 12px 16px;
  text-align: center;
  margin: 12px 0;
}
.result-summary .summary-main {
  font-size: 16px; font-weight: 700; color: var(--color-success);
  margin-bottom: 2px;
}
.result-summary .summary-sub { font-size: 13px; color: var(--color-gray-600); }

/* ===== Result Actions ===== */
.result-actions {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  margin: 12px 0;
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 28px;
  background: var(--color-primary);
  color: #fff;
  font-size: 15px; font-weight: 700;
  border: none; border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
  box-shadow: var(--shadow);
}
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-primary:disabled { background: var(--color-gray-300); cursor: not-allowed; box-shadow: none; }

.btn-secondary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 22px;
  background: #fff;
  color: var(--color-gray-700);
  font-size: 15px; font-weight: 600;
  border: 1.5px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--color-gray-400); background: var(--color-gray-50); }

/* ===== Spinner ===== */
.spinner {
  width: 16px; height: 16px;
  border: 2.5px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Footer ===== */
.footer {
  margin-top: 32px;
  padding: 16px;
  text-align: center;
  font-size: 12px;
  color: var(--color-gray-400);
  border-top: 1px solid var(--color-gray-200);
}
.footer strong { color: var(--color-gray-600); }

/* ===== Utilities ===== */
.hidden { display: none !important; }

/* ===== Responsive (Mobile) ===== */
@media (max-width: 480px) {
  .header-title h1 { font-size: 17px; }
  .dropzone { padding: 28px 16px; }
  .dropzone-icon { font-size: 32px; }
  .dropzone-primary { font-size: 15px; }
  .preset-section { flex-direction: column; align-items: flex-start; gap: 6px; }
  .preset-buttons { width: 100%; }
  .preset-btn { flex: 1; padding: 8px 6px; font-size: 12px; }
  .file-item { grid-template-columns: 44px 1fr auto; gap: 8px; padding: 8px 10px; }
  .file-thumb { width: 40px; height: 40px; }
  .btn-primary, .btn-secondary { padding: 11px 18px; font-size: 14px; }
  .result-actions { flex-direction: column; }
  .result-actions .btn-primary,
  .result-actions .btn-secondary { width: 100%; justify-content: center; }
}