/* ── App shell: sidebar + main content ──────────────────────────────── */
.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-black);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}

.sidebar__brand {
  padding: var(--space-5) var(--space-5) var(--space-4);
  font-weight: 800;
  font-size: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar__campaign {
  padding: var(--space-3) var(--space-5);
  font-size: 13px;
  color: var(--color-gray-400);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.sidebar__campaign strong {
  color: var(--color-white);
  display: block;
  font-size: 14px;
}

.sidebar__nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar__link {
  display: block;
  padding: 12px var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--color-gray-300);
  font-weight: 600;
  font-size: 15px;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.sidebar__link:hover {
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
  color: var(--color-white);
}
.sidebar__link.is-active {
  background: var(--color-red);
  color: var(--color-white);
}

.sidebar__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.sidebar__user {
  font-size: 14px;
  color: var(--color-gray-300);
  margin-bottom: var(--space-3);
}
.sidebar__user strong {
  display: block;
  color: var(--color-white);
}

.main {
  flex: 1;
  min-width: 0;
  padding: var(--space-8);
}

.main__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.main__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ── Mobile: sidebar becomes a top bar with hamburger ───────────────── */
.hamburger {
  display: none;
}

@media (max-width: 900px) {
  .app {
    flex-direction: column;
  }
  .sidebar {
    position: static;
    height: auto;
    width: 100%;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }
  .sidebar__brand {
    border-bottom: none;
    flex: 1;
  }
  .hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-right: var(--space-3);
    background: transparent;
    border: none;
    color: var(--color-white);
    font-size: 22px;
    cursor: pointer;
  }
  .sidebar__campaign {
    display: none;
  }
  .sidebar__nav {
    width: 100%;
    display: none;
    flex-direction: column;
  }
  .sidebar__nav.is-open {
    display: flex;
  }
  .sidebar__footer {
    width: 100%;
    display: none;
  }
  .sidebar__footer.is-open {
    display: block;
  }
  .main {
    padding: var(--space-5);
  }
}

/* ── Utility layout classes ──────────────────────────────────────────── */
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }

.center-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: var(--color-black);
  background: linear-gradient(160deg, var(--color-black) 0%, #3a0507 100%);
}