:root {
  --bg: #f6f8fb;
  --white: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;

  --blue: #2563eb;
  --blue-soft: #eff6ff;

  --green: #16a34a;
  --green-soft: #ecfdf5;

  --orange: #f59e0b;
  --orange-soft: #fffbeb;

  --purple: #7c3aed;
  --purple-soft: #f5f3ff;

  --danger: #ef4444;
  --danger-soft: #fef2f2;

  --radius: 18px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Universal */
.sidebar {
  width: 260px;
  background: var(--white);
  border-right: 1px solid var(--border);
  padding: 28px 20px;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  margin-bottom: 42px;
  padding-left: 8px;
}

.logo-img {
  width: 200px;
  height: auto;
  display: block;
}

/* Menu */
.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-menu a,
.nav-group-title {
  text-decoration: none;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 13px 14px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  transition: 0.25s ease;
}

.nav-menu a i,
.nav-group-title i {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--blue-soft);
  color: var(--blue);
}

/* FIFO Group */
.nav-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-group-title {
  cursor: default;
  background: #f9fafb;
  border: 1px solid transparent;
}

.nav-group.active .nav-group-title {
  background: var(--blue-soft);
  color: var(--blue);
  border-color: #dbeafe;
}

.nav-submenu {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-left: 16px;
  padding-left: 12px;
  border-left: 2px solid #e5e7eb;
}

.nav-submenu a {
  font-size: 13px;
  padding: 11px 12px;
  border-radius: 12px;
}

.nav-submenu a i {
  width: 18px;
  font-size: 13px;
}

.nav-submenu a:hover,
.nav-submenu a.active {
  background: var(--blue-soft);
  color: var(--blue);
}

/* Main Content */
.main {
  flex: 1;
  padding: 28px;
  min-width: 0;
}

/* Responsive Layout */
@media (max-width: 850px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    padding: 22px 18px;
  }

  .logo {
    margin-bottom: 24px;
  }

  .nav-menu {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .nav-menu a,
  .nav-group-title {
    white-space: nowrap;
  }

  .nav-group {
    min-width: 230px;
    flex-shrink: 0;
  }

  .nav-submenu {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
  }
}

@media (max-width: 600px) {
  .main {
    padding: 18px;
  }

  .logo-img {
    width: 130px;
  }

  .sidebar {
    padding: 18px;
  }

  .nav-menu a,
  .nav-group-title {
    font-size: 14px;
    padding: 12px;
  }

  .nav-submenu a {
    font-size: 12px;
    padding: 10px;
  }
}

.topbar {
    display: flex;
    justify-content: flex-end;
    padding: 16px 24px 0;
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: #fff2f2;
    color: #e5484d;
    border: 1px solid #fdeaea;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-logout:hover {
    background: #fdeaea;
}

.btn-logout i {
    font-size: 13px;
}