/* =====================================================
   top_nav.css — 顶部导航栏 (Windows 7 Aero Glass 风格)
   ===================================================== */

/* ---------- 全局重置与基础 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Segoe UI", "Microsoft YaHei", "微软雅黑", Tahoma, sans-serif;
    background: #1a1a2e;
    min-height: 100vh;
}

/* ---------- 导航栏容器：Aero Glass 毛玻璃效果 ---------- */
.aero-topnav {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 60px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    user-select: none;
}

/* 顶部高光 (Aero Glass 特征) */
.aero-topnav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
}

/* ---------- 左侧 Logo 区域 ---------- */
.aero-topnav__left {
    display: flex;
    align-items: center;
    gap: 6px;
    position: relative;
}

.aero-topnav__logo {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.aero-topnav__logo:hover {
    background: rgba(255, 255, 255, 0.1);
}

.aero-topnav__logo img {
    width: 36px;
    height: 36px;
    display: block;
}

.aero-topnav__logo-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    cursor: pointer;
    transition: transform 0.25s ease;
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

.aero-topnav__logo-arrow--open {
    transform: rotate(180deg);
}

/* ---------- Logo 下拉菜单 (Aero Glass 弹窗) ---------- */
.aero-topnav__logo-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: 520px;
    background: rgba(30, 30, 50, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 12px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    z-index: 1100;
    overflow: hidden;
}

/* 下拉菜单顶部高光 */
.aero-topnav__logo-dropdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.aero-topnav__logo-dropdown--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* ---------- 左右分栏布局 ---------- */
.aero-topnav__dropdown-grid {
    display: flex;
    min-height: 280px;
}

.aero-topnav__dropdown-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 14px 0;
}

.aero-topnav__dropdown-right {
    flex: 1;
    padding: 14px 0 14px 0;
    position: relative;
}

/* 中间竖线分隔 */
.aero-topnav__dropdown-divider-vertical {
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    margin: 8px 0;
}

/* ---------- 左侧区域：上/下分半 ---------- */
.aero-topnav__dropdown-left-top {
    flex: 1;
    padding: 0 16px 12px 16px;
    position: relative;
}

/* 左侧区域横线分隔（仅在左侧显示） */
.aero-topnav__dropdown-left-divider {
    height: 1px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), transparent);
    margin: 0 16px;
}

.aero-topnav__dropdown-left-bottom {
    flex: 1;
    padding: 12px 16px 0 16px;
}

/* ---------- 标题样式 ---------- */
.aero-topnav__dropdown-title {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 10px;
    padding: 0 4px;
}

/* ---------- 选项列表 ---------- */
.aero-topnav__dropdown-items {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.aero-topnav__dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    transition: background 0.15s ease, color 0.15s ease;
    text-decoration: none;
}

.aero-topnav__dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.aero-topnav__dropdown-item img {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    display: block;
    border-radius: 3px;
}

.aero-topnav__dropdown-item span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---------- 右侧部分选项 ---------- */
.aero-topnav__dropdown-right .aero-topnav__dropdown-title {
    padding-left: 16px;
}

.aero-topnav__dropdown-right .aero-topnav__dropdown-items {
    padding: 0 16px;
}

/* ---------- 网站名称 ---------- */
.aero-topnav__site-name {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    padding: 6px 14px;
    border-radius: 6px;
    transition: background 0.2s ease;
    text-decoration: none;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    margin-left: 4px;
}

.aero-topnav__site-name:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ---------- 中间区域 ---------- */
.aero-topnav__center {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ---------- 支持区域 ---------- */
.aero-topnav__support {
    position: relative;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    transition: background 0.2s ease, color 0.2s ease;
}

.aero-topnav__support:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.aero-topnav__support-arrow {
    font-size: 10px;
    transition: transform 0.25s ease;
    color: rgba(255, 255, 255, 0.5);
}

.aero-topnav__support:hover .aero-topnav__support-arrow {
    transform: rotate(180deg);
}

/* ---------- 支持下划线菜单 ---------- */
.aero-topnav__support-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 150px;
    background: rgba(30, 30, 50, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 10px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    z-index: 1100;
}

.aero-topnav__support-dropdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.aero-topnav__support-dropdown--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.aero-topnav__support-dropdown-item {
    display: block;
    padding: 10px 14px;
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    text-decoration: none;
    white-space: nowrap;
}

.aero-topnav__support-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

/* ---------- 右侧按钮区域 ---------- */
.aero-topnav__right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ---------- 按钮通用样式 (Aero Glass) ---------- */
.aero-topnav__btn {
    padding: 7px 18px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    outline: none;
}

/* 下载按钮 */
.aero-topnav__btn--download {
    background: linear-gradient(135deg, rgba(0, 153, 255, 0.6), rgba(0, 102, 204, 0.6));
    color: #fff;
    border: 1px solid rgba(0, 153, 255, 0.3);
    backdrop-filter: blur(4px);
}

.aero-topnav__btn--download:hover {
    background: linear-gradient(135deg, rgba(0, 153, 255, 0.8), rgba(0, 102, 204, 0.8));
    box-shadow: 0 4px 15px rgba(0, 153, 255, 0.3);
    transform: translateY(-1px);
}

.aero-topnav__btn--download:active {
    transform: translateY(0);
}

/* 登录按钮 */
.aero-topnav__btn--login {
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
}

.aero-topnav__btn--login:hover {
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* ---------- 登录后用户头像 + 昵称 ---------- */
.aero-topnav__user {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 0.2s ease;
    position: relative;
}

.aero-topnav__user:hover {
    background: rgba(255, 255, 255, 0.1);
}

.aero-topnav__user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.2);
    display: block;
    object-fit: cover;
}

.aero-topnav__user-nickname {
    color: #fff;
    font-size: 13px;
    font-weight: 500;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---------- 用户下拉菜单 ---------- */
.aero-topnav__user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: rgba(30, 30, 50, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 12px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    z-index: 1100;
}

.aero-topnav__user-dropdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.aero-topnav__user-dropdown--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.aero-topnav__user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    text-decoration: none;
}

.aero-topnav__user-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.aero-topnav__user-dropdown-item img {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: block;
}

/* 退出选项特殊样式 */
.aero-topnav__user-dropdown-item--danger {
    color: rgba(255, 100, 100, 0.8);
}

.aero-topnav__user-dropdown-item--danger:hover {
    background: rgba(255, 60, 60, 0.15);
    color: #ff6b6b;
}

/* 用户下拉菜单分隔线 */
.aero-topnav__user-dropdown-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 4px 8px;
}

/* ---------- 隐藏辅助 ---------- */
.aero-topnav__hidden {
    display: none !important;
}

/* =====================================================
   响应式布局
   ===================================================== */

/* 中等屏幕 */
@media (max-width: 900px) {
    .aero-topnav {
        padding: 0 16px;
    }

    .aero-topnav__logo-dropdown {
        width: 440px;
    }
}

/* 小屏幕 */
@media (max-width: 680px) {
    .aero-topnav {
        padding: 0 12px;
        height: 52px;
    }

    .aero-topnav__site-name {
        font-size: 14px;
        padding: 4px 8px;
    }

    .aero-topnav__support {
        font-size: 12px;
        padding: 4px 10px;
    }

    .aero-topnav__btn {
        padding: 5px 12px;
        font-size: 12px;
    }

    .aero-topnav__logo-dropdown {
        width: 360px;
        left: 0;
        right: auto;
    }

    .aero-topnav__user-nickname {
        display: none;
    }

    .aero-topnav__logo img {
        width: 30px;
        height: 30px;
    }
}

/* 超小屏幕 */
@media (max-width: 480px) {
    .aero-topnav__support {
        display: none;
    }

    .aero-topnav__logo-dropdown {
        width: 300px;
    }

    .aero-topnav__btn--login {
        padding: 5px 10px;
        font-size: 11px;
    }

    .aero-topnav__btn--download {
        padding: 5px 10px;
        font-size: 11px;
    }
}