/* ==============================
   项目22：菜单过渡动画
   Menu Transition
   ============================== */

/* ========== 全局样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: #fff;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========== 主内容区 ========== */
.main-content {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========== 菜单按钮（右上角） ========== */
.menu-toggle {
    position: fixed;
    top: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.menu-toggle:hover {
    transform: scale(1.1);
}

.menu-toggle i {
    font-size: 28px;
    position: absolute;
    transition: all 0.3s ease;
}

/* 菜单图标（汉堡菜单） */
.menu-icon {
    color: #000;
    opacity: 1;
    transition: all 0.3s ease;
}

/* 关闭图标（X） */
.close-icon {
    color: #fff;
    opacity: 0;
    transform: rotate(-90deg);
    transition: all 0.3s ease;
}

/* 菜单打开状态 */
.menu-toggle.active .menu-icon {
    color: #fff;
    opacity: 0;
    transform: rotate(90deg);
}

.menu-toggle.active .close-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* ========== 内容区域 ========== */
.content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.title {
    font-size: 3rem;
    color: #000;
    margin-bottom: 20px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    font-weight: 400;
}

/* ========== 菜单遮罩层 ========== */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translateX(100%);
    transition: transform 1s cubic-bezier(0.77, 0, 0.175, 1);
}

/* 菜单打开状态 */
.menu-overlay.active {
    transform: translateX(0);
}

/* ========== 圆环光晕 ========== */
.menu-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 235, 153, 0.3) 0%, rgba(255, 235, 153, 0) 70%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
    transition-delay: 0.3s;
}

.menu-overlay.active .menu-glow {
    opacity: 1;
}

/* ========== 菜单导航 ========== */
.menu-nav {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.4s ease;
    transition-delay: 0.2s;
}

.menu-overlay.active .menu-nav {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 菜单列表 ========== */
.menu-list {
    list-style: none;
    text-align: center;
}

.menu-item {
    margin: 30px 0;
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.4s ease;
}

/* 每个菜单项依次出现 */
.menu-overlay.active .menu-item:nth-child(1) {
    transition-delay: 0.3s;
    opacity: 1;
    transform: translateX(0);
}

.menu-overlay.active .menu-item:nth-child(2) {
    transition-delay: 0.4s;
    opacity: 1;
    transform: translateX(0);
}

.menu-overlay.active .menu-item:nth-child(3) {
    transition-delay: 0.5s;
    opacity: 1;
    transform: translateX(0);
}

.menu-overlay.active .menu-item:nth-child(4) {
    transition-delay: 0.6s;
    opacity: 1;
    transform: translateX(0);
}

.menu-overlay.active .menu-item:nth-child(5) {
    transition-delay: 0.7s;
    opacity: 1;
    transform: translateX(0);
}

/* ========== 菜单链接 ========== */
.menu-link {
    display: inline-block;
    font-size: 2.2rem;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    position: relative;
    transition: all 0.3s ease;
    font-family: 'Comic Sans MS', 'Comic Sans', cursive, sans-serif;
}

.menu-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background: #fff;
    transition: width 0.3s ease;
}

.menu-link:hover {
    transform: translateX(10px);
}

.menu-link:hover::after {
    width: 100%;
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    .menu-toggle {
        top: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    .menu-toggle i {
        font-size: 24px;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .menu-close {
        top: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    .menu-close i {
        font-size: 24px;
    }

    .menu-link {
        font-size: 1.8rem;
    }

    .menu-item {
        margin: 25px 0;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .menu-link {
        font-size: 1.4rem;
    }

    .menu-item {
        margin: 20px 0;
    }
}