:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-surface-3: #e2e8f0;
  --color-border: #cbd5e1;
  --color-border-subtle: #e2e8f0;
  --color-primary: #0f172a;
  --color-primary-hover: #1e293b;
  --color-accent: #0284c7;
  --color-accent-hover: #0369a1;
  --color-naver: #03c75a;
  --color-naver-hover: #02b150;
  --color-astro: #ff5d01;
  --color-google: #4285f4;
  --color-tistory: #ea5455;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.sstudio-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: 14px 24px;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.studio-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.5px;
}

.badge-version {
  font-size: 0.72rem;
  font-weight: 800;
  background: #e0f2fe;
  color: var(--color-accent);
  padding: 2px 8px;
  border-radius: 9999px;
  border: 1px solid #bae6fd;
}

.badge-status {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.badge-status.connected {
  background: #dcfce7;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.badge-status.disconnected {
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

/* Tab Navigation */
.tab-container {
  display: inline-flex;
  background: var(--color-surface-2);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  gap: 4px;
}

.tab-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.6);
}

.tab-btn.active {
  background: var(--color-surface);
  color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  font-weight: 800;
}

/* Layout */
.main-container {
  max-width: 1480px;
  margin: 0 auto;
  padding: 24px;
}

.grid-2col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 480px;
  gap: 24px;
  align-items: start;
}

@media (max-width: 1100px) {
  .grid-2col {
    grid-template-columns: 1fr;
  }
}

/* Card Panel */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-border-subtle);
  padding-bottom: 14px;
}

.panel-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Form Elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  font-size: 0.82rem;
  font-weight: 800;
  color: #334155;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: #ffffff;
  color: var(--color-text);
  font-size: 0.92rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.form-textarea {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  resize: vertical;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-naver {
  background: var(--color-naver);
  color: #ffffff;
}
.btn-naver:hover {
  background: var(--color-naver-hover);
}

.btn-astro {
  background: var(--color-astro);
  color: #ffffff;
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-3);
}

.btn-danger {
  background: #fee2e2;
  color: var(--color-danger);
  border-color: #fca5a5;
}
.btn-danger:hover {
  background: #fecaca;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-info { background: #e0f2fe; color: #075985; border: 1px solid #bae6fd; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

/* Markdown Preview */
.markdown-body {
  font-size: 0.94rem;
  line-height: 1.7;
  color: #1e293b;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  color: #0f172a;
  font-weight: 800;
  margin-top: 1.4em;
  margin-bottom: 0.6em;
}

.markdown-body h2 {
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--color-border-subtle);
}

.markdown-body p {
  margin: 0.8em 0;
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
}

.markdown-body table th, .markdown-body table td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  font-size: 0.88rem;
}

.markdown-body table th {
  background: var(--color-surface-2);
  font-weight: 700;
}

/* Batch Table */
.batch-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 14px;
}

.batch-table th, .batch-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border-subtle);
  text-align: left;
  font-size: 0.88rem;
}

.batch-table th {
  background: var(--color-surface-2);
  font-weight: 800;
  color: #475569;
}

.batch-table tr:hover td {
  background: #f8fafc;
}