:root {
  --bg-main: #f8fafc;
  --bg-panel: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --primary: #d97706;
  --primary-soft: #fef3c7;
  --primary-hover: #b45309;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --radius: 16px;
}

* { box-sizing: border-box; }
a { text-decoration: none; color: inherit; }

body {
  margin: 0;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(217, 119, 6, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(245, 158, 11, 0.05) 0%, transparent 40%);
}

.shell { max-width: 860px; margin: 0 auto; padding: 20px; padding-top: 0; }

/* Header */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  margin-bottom: 25px;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 10px;
}

.brandMark {
  background: transparent;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-size: 22px;
  line-height: 1;
}

.navLink {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-left: 12px;
  padding-right: 10px;
}

.navLink:hover { color: var(--primary); }

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.panelHead {
  margin-bottom: 15px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.panelTitle { font-size: 1.1rem; font-weight: 700; }
.panelSub { font-size: 0.9rem; color: var(--text-muted); margin-top: 4px; }

.footer {
  text-align: center;
  margin-top: 60px;
  color: var(--text-muted);
  font-size: 0.875rem;
}