:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #d1d5db;
  --blue: #2563eb;
  --green: #0f766e;
  --red: #b91c1c;
  --panel-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Noto Sans KR", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  padding: 22px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.title-row {
  min-width: 240px;
}

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

.subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab {
  border: 1px solid var(--line);
  background: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s ease;
}

.tab.active {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.14);
  color: var(--blue);
}

main {
  padding: 24px;
  display: grid;
  gap: 20px;
}

.panel {
  display: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--panel-shadow);
  padding: 24px;
}

.panel.active {
  display: block;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
}

.panel-header h2 {
  margin: 0;
  font-size: 20px;
}

.panel-header p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

button {
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #fff;
  border-radius: 10px;
  padding: 10px 18px;
  cursor: pointer;
  font-weight: 600;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

label {
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

label.full-width {
  grid-column: 1 / -1;
}

input[type="date"],
input[type="text"],
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  font-size: 15px;
  padding: 12px 14px;
}

textarea {
  min-height: 280px;
  resize: vertical;
}

.status-bar {
  padding: 14px 16px;
  border-radius: 14px;
  background: #eef2ff;
  color: var(--ink);
  border: 1px solid rgba(59, 130, 246, 0.15);
}

.status-bar.error {
  background: #fee2e2;
  border-color: rgba(185, 28, 28, 0.2);
  color: var(--red);
}

.content-block {
  margin-top: 20px;
}

.muted {
  color: var(--muted);
}

.channel-block,
.video-block {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 18px;
  background: #fff;
}

.channel-block h3,
.video-block h4 {
  margin: 0 0 10px;
}

.meta {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 12px;
}

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

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--ink);
  font-size: 13px;
}

.chip.muted {
  background: #f8fafc;
  color: var(--muted);
}

.comment-item {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

.comment-meta {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
  margin-bottom: 6px;
}

.comment-text {
  color: var(--ink);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
}

@media (max-width: 720px) {
  .panel-header {
    flex-direction: column;
    align-items: stretch;
  }

  .tabs {
    width: 100%;
    justify-content: space-between;
  }
}