/* ========================================
   统一导航栏样式
   适用于所有页面的导航栏组件
   ======================================== */

/* ==================== 基础导航栏样式 ==================== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 64px;
    background: var(--nav-bg-light);  /* ⭐ 使用统一的导航栏背景色变量 */
    z-index: var(--z-fixed);
    box-shadow: none;  /* ⭐ 移除阴影 */
}

/* 导航栏占位符（防止内容被fixed的nav遮挡） */
.nav-spacer {
    height: 96px; /* 对应top-nav的高度 (48px内容 + 24px*2 padding) */
}

/* ==================== 左侧区域 ==================== */
.left-nav-section {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* ==================== 通用按钮样式 ==================== */
.nav-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.nav-btn:hover {
    transform: scale(1.1);
}

/* ==================== 头像按钮（统一样式） ==================== */
.avatar-btn,
#user-avatar-btn {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    overflow: hidden;
    background: #f5f5f5;
}

.avatar-btn:hover,
#user-avatar-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(235, 177, 195, 0.4);
}

.avatar-btn img,
#user-avatar-btn img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ==================== 返回按钮 ==================== */
.back-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-btn:hover {
    background: #F9E4E9;
    border-radius: 8px;
}

.back-btn svg {
    flex-shrink: 0;
}

/* ==================== Home按钮 ==================== */
.home-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.home-btn:hover {
    background: #F9E4E9;
    border-radius: 8px;
}

.home-btn .nav-icon-desktop {
    display: block;
}

.home-btn .nav-icon-mobile {
    display: none;
}

/* ==================== 右侧图标区域 ==================== */
.nav-icons {
    display: flex;
    align-items: center;
    gap: 48px;
}

.nav-icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-icon-btn:hover {
    transform: scale(1.1);
}

.nav-icon-btn .nav-icon-desktop {
    display: block;
}

.nav-icon-btn .nav-icon-mobile {
    display: none;
}

/* ==================== 夜间模式 ==================== */
body.dark-mode .top-nav {
    background: var(--nav-bg-dark) !important;  /* ⭐ 夜间模式时使用深色背景 */
    border-bottom: 1px solid var(--border-dark);
}

/* 头像按钮在夜间模式下的特殊处理 */
body.dark-mode .avatar-btn,
body.dark-mode #user-avatar-btn {
    background: #4A4A4A;
    padding: 3px;
}

body.dark-mode .avatar-btn img,
body.dark-mode #user-avatar-btn img {
    filter: none;
    opacity: 1;
}

body.dark-mode .avatar-btn:hover img,
body.dark-mode #user-avatar-btn:hover img {
    filter: brightness(1.3) contrast(1);
    opacity: 1;
}

body.dark-mode .nav-btn {
    color: #e0e0e0;
}

body.dark-mode .nav-btn:hover {
    background: #3a3a3a;
}

body.dark-mode .nav-icon-btn img {
    filter: invert(1);
}

/* ==================== iPad适配 (769px - 1024px) ==================== */
@media screen and (min-width: 769px) and (max-width: 1024px) {
    .top-nav {
        padding: 20px 48px;
    }
    
    .nav-spacer {
        height: 80px;
    }
    
    /* 头像按钮 - iPad */
    .avatar-btn,
    #user-avatar-btn {
        width: 56px;
        height: 56px;
    }
    
    .back-btn {
        width: 36px;
        height: 36px;
    }
    
    .home-btn {
        width: 44px;
        height: 44px;
    }
    
    .nav-icons {
        gap: 36px;
    }
}

/* ==================== 平板适配 (481px - 768px) ==================== */
@media screen and (min-width: 481px) and (max-width: 768px) {
    .top-nav {
        padding: 16px 32px;
    }
    
    .nav-spacer {
        height: 72px;
    }
    
    /* 头像按钮 - 平板 */
    .avatar-btn,
    #user-avatar-btn {
        width: 48px;
        height: 48px;
    }
    
    .back-btn {
        width: 32px;
        height: 32px;
    }
    
    .home-btn {
        width: 40px;
        height: 40px;
    }
    
    .left-nav-section {
        gap: 16px;
    }
    
    .nav-icons {
        gap: 32px;
    }
}

/* ==================== 移动端适配 (≤480px) ==================== */
@media (max-width: 480px) {
    .top-nav {
        padding: 12px 24px;
    }
    
    .nav-spacer {
        height: 64px;
    }
    
    /* 头像按钮 - 移动端 */
    .avatar-btn,
    #user-avatar-btn {
        width: 40px;
        height: 40px;
    }
    
    .back-btn {
        width: 28px;
        height: 28px;
    }
    
    .back-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .home-btn {
        width: 32px;
        height: 32px;
    }
    
    /* 移动端显示小图标 */
    .home-btn .nav-icon-desktop {
        display: none;
    }
    
    .home-btn .nav-icon-mobile {
        display: block;
    }
    
    .nav-icon-btn .nav-icon-desktop {
        display: none;
    }
    
    .nav-icon-btn .nav-icon-mobile {
        display: block;
    }
    
    .left-nav-section {
        gap: 12px;
    }
    
    .nav-icons {
        gap: 24px;
    }
}

/* ==================== 超小屏幕优化 (≤375px) ==================== */
@media (max-width: 375px) {
    .top-nav {
        padding: 10px 16px;
    }
    
    .nav-spacer {
        height: 56px;
    }
    
    /* 头像按钮 - 超小屏 */
    .avatar-btn,
    #user-avatar-btn {
        width: 36px;
        height: 36px;
    }
    
    .back-btn {
        width: 24px;
        height: 24px;
    }
    
    .back-btn svg {
        width: 18px;
        height: 18px;
    }
    
    .home-btn {
        width: 28px;
        height: 28px;
    }
    
    .left-nav-section {
        gap: 8px;
    }
    
    .nav-icons {
        gap: 16px;
    }
    
    .nav-icon-btn img {
        width: 28px !important;
        height: 28px !important;
    }
}