/* ===================== BASE RESET ===================== */
* {
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
}

/* ===================== HEADER ===================== */
.app-header {
  height: var(--header-height);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow-sm);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.app-header__logo {
  height: 28px;
  width: auto;
  display: block;
}

.app-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ===================== APP BODY (SIDEBAR + MAIN) ===================== */
.app-body {
  display: flex;
  min-height: calc(100vh - var(--header-height) - var(--footer-height));
}

/* ===================== SIDEBAR ===================== */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-md);
  border-left: 3px solid transparent;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar__link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.sidebar__link--active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.sidebar__icon {
  font-size: var(--font-size-lg);
}

/* ===================== MAIN CONTENT ===================== */
.main-content {
  flex: 1;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  min-width: 0;
}

/* ===================== FOOTER ===================== */
.app-footer {
  height: var(--footer-height);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}