:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --sidebar-width: 255px;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  background-color: #ffffff;
  border-right: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-nav {
  padding: 0.75rem 0.5rem;
  flex-grow: 1;
  overflow-y: auto;
}

.sidebar-heading {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  padding: 0.65rem 0.85rem 0.25rem;
}

.sidebar-nav .nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  transition: background-color 0.15s ease, color 0.15s ease;
  font-size: 0.83rem;
}

.sidebar-nav .nav-link:hover {
  background-color: #f1f5f9;
  color: var(--text-primary);
}

.sidebar-nav .nav-link.active {
  background-color: #eff6ff;
  color: var(--primary-color);
  font-weight: 600;
}

.sidebar-footer {
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-color);
  background-color: #fafbfc;
}

/* Main Content Area */
.app-main {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-topbar {
  height: 58px;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-content {
  padding: 1.5rem;
  flex-grow: 1;
}

/* Clean Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.card-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-body {
  padding: 1rem;
}

/* Tables */
.table {
  color: var(--text-primary);
  margin-bottom: 0;
  font-size: 0.84rem;
}

.table th {
  background-color: #f8fafc;
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  padding: 0.65rem 0.85rem;
  white-space: nowrap;
}

.table td {
  padding: 0.65rem 0.85rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border-color);
}

/* Code & Terminal Windows */
.code-preview {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.75rem;
  font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.45;
  color: #1e293b;
  overflow-x: auto;
  white-space: pre;
}

.terminal-box {
  background-color: #0f172a;
  color: #38bdf8;
  font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.78rem;
  padding: 0.75rem;
  border-radius: 4px;
  height: 260px;
  overflow-y: auto;
  line-height: 1.45;
}

/* Forms & Inputs */
.form-control, .form-select {
  font-size: 0.84rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  padding: 0.45rem 0.65rem;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

/* Launcher Live Mockup Frame */
.launcher-mockup {
  width: 100%;
  max-width: 540px;
  margin: 0 auto;
  border: 2px solid #cbd5e1;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  background-color: #1e293b;
}

.launcher-mockup-header {
  height: 32px;
  background-color: #334155;
  color: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  font-size: 0.75rem;
  font-weight: 600;
}

.launcher-mockup-window-controls {
  display: flex;
  gap: 5px;
}

.launcher-mockup-window-controls span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.launcher-mockup-body {
  height: 280px;
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 15px;
}

.launcher-mockup-footer {
  background-color: rgba(15, 23, 42, 0.85);
  border-radius: 6px;
  padding: 10px 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Leaderboard Badges */
.rank-badge-1 {
  background-color: #fbbf24;
  color: #78350f;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.rank-badge-2 {
  background-color: #94a3b8;
  color: #0f172a;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.rank-badge-3 {
  background-color: #d97706;
  color: #ffffff;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

/* Modals */
.modal-content {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.modal-header {
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.15rem;
}

.modal-footer {
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1.15rem;
}