@layer layout {
  aside.sidebar {
    position: sticky;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--space-4);
    background-color: var(--color-background);
    border-right: 1px solid var(--color-border);
    z-index: 100;

    /* Mobile: hidden overlay */
    @media (max-width: 767px) {
      position: fixed;
      transform: translateX(-100%);
      transition: transform var(--transition-slow);
      box-shadow: var(--shadow-xl);

      &.is-open {
        transform: translateX(0);
      }
    }

    .sidebar__header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-4);

      .logo {
        font-size: var(--text-2xl);
        font-weight: var(--font-bold);
        color: var(--color-gray-900);
        text-decoration: none;
        &:hover {
          color: var(--color-primary-600);
        }
      }

      .sidebar__close {
        display: none;
        align-items: center;
        justify-content: center;
        width: 2.5rem;
        height: 2.5rem;
        padding: 0;
        background: transparent;
        border: none;
        border-radius: var(--radius-md);
        cursor: pointer;
        color: var(--color-gray-500);

        &:hover {
          background: var(--color-gray-100);
          color: var(--color-gray-700);
        }

        svg {
          width: 1.5rem;
          height: 1.5rem;
        }

        @media (max-width: 767px) {
          display: flex;
        }
      }
    }

    .sidebar__nav {
      ul {
        display: flex;
        flex-direction: column;
        gap: var(--space-2);
        padding: 0;
        margin: 0;
        li {
          list-style-type: none;
          margin: 0;
          .sidebar__nav-item {
            display: flex;
            align-items: center;
            gap: var(--space-4);
            font-size: var(--text-base);
            font-weight: var(--font-semibold);
            padding: var(--space-2) var(--space-3);
            text-decoration: none;
            color: var(--color-gray-700);
            background: transparent;
            border-radius: var(--radius-md);
            transition: var(--transition-normal);
            svg path {
              stroke: var(--color-gray-500);
            }
            &:hover {
              background: var(--color-gray-100);
            }
            &.is-active {
              background: var(--color-primary-50);
              color: var(--color-primary-700);
              svg path {
                stroke: var(--color-primary-600);
              }
            }
          }
        }
      }
    }

    .sidebar__footer {
      margin-top: auto;
      .sidebar__account-btn {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: var(--space-2) var(--space-3);
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        cursor: pointer;
        text-align: left;

        svg path {
          stroke: var(--color-gray-500);
        }

        &:hover {
          background-color: var(--color-gray-100);
        }
      }

      .sidebar__account-info {
        display: flex;
        flex-direction: column;
        min-width: 0;
      }

      .sidebar__account-name {
        font-size: var(--text-base);
        font-weight: var(--font-semibold);
        color: var(--color-gray-900);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .sidebar__account-email {
        font-size: var(--text-sm);
        color: var(--color-gray-600);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .dropdown__menu {
        width: 100%;
      }
    }
  }

  [data-theme="dark"] {
    aside.sidebar {
      .sidebar__nav {
        ul li {
          .sidebar__nav-item {
            &:hover {
              background: var(--color-hover);
            }

            &.is-active {
              background: var(--color-hover);
              color: var(--color-gray-700);

              svg path {
                stroke: var(--color-gray-600);
              }
            }
          }
        }
      }

      .sidebar__footer {
        .sidebar__account-btn {
          background: var(--color-surface);
          &:hover {
            background-color: var(--color-hover);
          }
        }
      }
    }
  }
}