:root {
  --bg-color: #020617; /* 검정에 가까운 다크 슬레이트 */
  --panel-bg: #0F172A; /* 어두운 남색 */
  --card-bg: #1E293B; /* 조금 더 밝은 남색 */
  --card-hover: #334155;
  --primary-color: #10B981; /* 민트/초록 */
  --primary-hover: #059669;
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --border-color: #334155;
  --error-color: #EF4444;
  --highlight-yellow: #FBBF24;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Pretendard', -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

.screen { display: none; height: 100%; }
.screen.active { display: block; }

/* Login */
#login-screen {
  align-items: center; 
  justify-content: center;
}
#login-screen.active { display: flex; }

.login-card {
  background: var(--panel-bg);
  padding: 40px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-align: center;
  max-width: 400px;
  width: 100%;
}
.badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.2);
  color: var(--primary-color);
  font-size: 11px;
  font-weight: bold;
  padding: 4px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}
.highlight { color: var(--primary-color); }
.version { color: var(--text-muted); font-size: 13px; margin-bottom: 24px; }
.login-card input {
  width: 100%;
  padding: 14px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: white;
  border-radius: 6px;
  margin-bottom: 12px;
  font-size: 15px;
  letter-spacing: 4px; /* 마스킹 간격 넓게 */
}
.login-card input:focus { outline: none; border-color: var(--primary-color); }
.login-card button {
  width: 100%;
  padding: 14px;
  background: var(--primary-color);
  color: #020617;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  font-size: 15px;
  cursor: pointer;
  transition: 0.2s;
}
.login-card button:hover { background: var(--primary-hover); }
.error-text { color: var(--error-color); font-size: 13px; margin-top: 8px; min-height: 18px; }

/* Main Screen Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 30px;
  border-bottom: 1px solid var(--border-color);
  background: var(--panel-bg);
  height: 80px;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-left h1 { font-size: 20px; margin-left: 8px; }
.version-text { color: var(--text-muted); font-size: 12px; }

.header-right { display: flex; align-items: center; gap: 12px; }
.secondary-btn {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
}
.secondary-btn:hover { background: var(--card-bg); }

.primary-outline-btn {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
  font-weight: bold;
}
.primary-outline-btn:hover { background: rgba(16, 185, 129, 0.1); }

.category-count-box {
  background: var(--card-bg);
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: bold;
  border: 1px solid var(--border-color);
  color: var(--primary-color);
}

/* Layout */
.main-layout {
  display: flex;
  padding: 24px 30px;
  gap: 24px;
  height: calc(100vh - 80px);
  overflow: hidden;
}

/* Left: Category Area */
.category-area {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  overflow-y: auto;
  padding-right: 8px;
  align-content: start;
}
.category-area::-webkit-scrollbar { width: 8px; }
.category-area::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
.category-area::-webkit-scrollbar-track { background: transparent; }

.category-card {
  background: var(--panel-bg);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}
.category-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.1);
}
.cat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.cat-number {
  font-size: 20px;
  font-weight: bold;
  color: var(--primary-color);
  background: var(--bg-color);
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.cat-actions { display: flex; gap: 8px; align-items: center; }

.delete-cat-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
  transition: 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.delete-cat-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error-color);
}

.cat-count { font-size: 13px; color: var(--text-muted); font-weight: bold;}
.small-btn {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.2s;
}
.small-btn:hover { background: var(--border-color); color: white; }

.drop-zone {
  flex: 1;
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  min-height: 120px;
  background: var(--bg-color);
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary-color);
  background: rgba(16, 185, 129, 0.05);
  color: var(--primary-color);
}
.thumbnail-container {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.thumb {
  width: 44px; height: 44px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}
.thumb-more {
  width: 44px; height: 44px;
  border-radius: 6px;
  background: var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: bold; color: white;
}

/* Right: Settings */
.settings-panel {
  width: 380px;
  background: var(--panel-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.settings-panel::-webkit-scrollbar { width: 6px; }
.settings-panel::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

.panel-header h2 { font-size: 18px; margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 12px; display:flex; align-items:center; gap:8px;}

.setting-group { margin-bottom: 20px; }
.setting-group label { display: block; font-size: 14px; margin-bottom: 8px; color: var(--text-muted); }
.setting-group input[type="text"], .setting-group input[type="number"] {
  width: 100%;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: white;
  padding: 12px;
  border-radius: 6px;
  font-size: 14px;
}
.setting-group input:focus { outline: none; border-color: var(--primary-color); }
.input-with-suffix { display: flex; align-items: center; gap: 8px; }
.input-with-suffix input { flex: 1; }

.options-group {
  background: var(--bg-color);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.checkbox-label { display: flex; align-items: center; gap: 8px; cursor: pointer; color: var(--text-main); font-size: 14px; margin-bottom: 12px;}
.checkbox-label:last-of-type { margin-bottom: 8px; }
.highlight-label { color: var(--highlight-yellow); font-weight: bold; }
.help-text { font-size: 12px; color: var(--text-muted); line-height: 1.4; }
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }

.stats-box {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  font-size: 14px;
}
.stat-item { display: flex; justify-content: space-between; margin-bottom: 8px; }
.stat-item:last-child { margin-bottom: 0; }

.primary-btn {
  width: 100%;
  background: var(--primary-color);
  color: #020617;
  border: none;
  padding: 16px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}
.primary-btn:hover { background: var(--primary-hover); }
.primary-btn:disabled { background: var(--border-color); color: var(--text-muted); cursor: not-allowed; }

/* Log Box */
.log-container {
  margin-top: auto;
  padding-top: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.log-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.log-header h3 { font-size: 14px; color: var(--text-muted); }
.log-box {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px;
  font-family: monospace;
  font-size: 12px;
  color: var(--text-muted);
  flex: 1;
  min-height: 120px;
  overflow-y: auto;
  white-space: pre-wrap;
  line-height: 1.5;
}
.log-box::-webkit-scrollbar { width: 6px; }
.log-box::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

@media (max-width: 1400px) {
  .settings-panel { width: 340px; }
}

@media (max-width: 1000px) {
  body { overflow: auto; }
  .category-area { grid-template-columns: 1fr; }
  .main-layout { flex-direction: column; height: auto; overflow: visible; }
  .settings-panel { width: 100%; min-height: 800px; }
  .log-container { min-height: 200px; }
}