/*
   General breakpoints:
   - Desktop: ≥ 1024px  (default in style.css)
   - Tablet:  600–1023px
   - Mobile:  ≤ 768px
*/

/* ================================
   TABLET LAYOUT (≤ 1024px)
   ================================ */
@media (max-width: 1024px) {
    #sidebar {
        width: 25%;
        min-width: 180px;
        padding: 1rem;
    }

    .main-content {
        margin-left: 25%;
        width: calc(100% - 25%);
        padding: 2rem;
    }

    table {
        font-size: 0.9rem;
    }
}

/* ================================
   MOBILE LAYOUT (≤ 768px)
   ================================ */
@media (max-width: 768px) {

    /* 1. 汉堡包菜单面板 (Sidebar) */
    #sidebar {
        position: fixed;
        left: -100%; /* 默认隐藏 */
        top: 0;
        height: 100dvh; /* 使用动态视口高度 */
        width: 70%;
        max-width: 280px;

        /* 修正：使用在 style.css 中定义的 --sidebar-color */
        background-color: var(--sidebar-color, #5e5a89);

        backdrop-filter: blur(6px);
        color: white;
        padding: 2rem 1.5rem;
        flex-direction: column;
        justify-content: flex-start;
        transition: left 0.35s ease;
        z-index: 1001; /* 必须在 overlay 之上 */
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.4);
    }

    /* 2. 菜单激活时的状态 */
    #menu-toggle:checked + #sidebar {
        left: 0; /* 显示侧边栏 */
    }

    /* 3. 汉堡包图标按钮 */
    .hamburger {
        position: fixed;
        top: 1rem;
        left: 1rem;
        z-index: 1100; /* 必须在所有元素之上 */
        cursor: pointer;
        width: 30px;
        height: 22px;
        display: flex; /* 改为 flex 以便显示 */
        flex-direction: column;
        justify-content: space-between;
    }

    .hamburger span {
        display: block;
        height: 4px;
        width: 100%;

        background-color: var(--accent, #4f86f7);

        border-radius: 4px;
        transition: all 0.3s ease;
    }

    /* 4. 汉堡包 "X" 动画 (当菜单激活时) */
    #menu-toggle:checked ~ .hamburger span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    #menu-toggle:checked ~ .hamburger span:nth-child(2) {
        opacity: 0;
    }

    #menu-toggle:checked ~ .hamburger span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    /* 5. 主内容区域在移动端推开 */
    .main-content {
        margin-left: 0;
        width: 100%; /* 占满全宽 */
        padding: 1.5rem;
        padding-top: 4rem; /* 增加顶部内边距，避免内容被汉堡包按钮遮挡 */
    }

    /* 6. 遮罩层 (Overlay) */
    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100dvh;
        background: rgba(0, 0, 0, 0.4);
        opacity: 0;
        pointer-events: none; /* 默认不可点击 */
        transition: opacity 0.3s ease;
        z-index: 1000; /* 在侧边栏之下，在主内容之上 */
    }

    /* 菜单激活时显示遮罩层 */
    #menu-toggle:checked ~ .overlay {
        opacity: 1;
        pointer-events: all; /* 允许点击（用于关闭菜单，虽然我们没加 JS，但这是标准做法）*/
    }

    /* 7. 移动端表单和表格调整 */
    form,
    table,
    .media-frame {
        width: 100%;
        max-width: 100%;
    }

    form {
        padding: 1rem;
    }

    th, td {
        font-size: 0.85rem;
        padding: 0.4rem;
    }

    footer {
        text-align: center;
        font-size: 0.8rem;
    }
}

/* ================================
   SMALL MOBILE LAYOUT (≤ 480px)
   ================================ */
@media (max-width: 480px) {
    .main-content {
        padding: 1rem;
        padding-top: 4rem; /* 同样需要顶部内边距 */
        font-size: 0.9rem;
    }

    h1, h2, h3 {
        font-size: 1.2rem;
    }

    nav ul {
        padding-left: 0;
    }

    .hamburger {
        width: 25px;
        height: 18px;
    }

    .hamburger span {
        height: 3px;
    }
}