/**
 * TopBar 样式
 * 汉堡折叠导航栏 - 全屏展开菜单
 * 左侧：Logo + 汉堡图标 | 点击展开全屏黑色导航
 */

/* ====================
   导航栏容器 - 固定悬浮于页面左上角，无背景
   ==================== */
.topbar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    z-index: 10001;
    background: transparent;
    pointer-events: none;
}

/* ====================
   顶部导航栏
   ==================== */
.topbar {
    width: 100%;
    height: 100%;
    background: transparent;
    display: flex;
    align-items: center;
    padding: 0 5vw;
    z-index: 10001;
    box-sizing: border-box;
    pointer-events: auto;
}

.topbar__container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* 左侧：Logo + 汉堡图标 */
.topbar__left {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Logo 区域 */
.topbar__logo {
    display: flex;
    align-items: center;
    height: 100%;
}

.topbar__logo img {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1) opacity(0.7);
    transition: opacity 0.3s ease;
}

.topbar__logo:hover img {
    opacity: 0.9;
}

/* ====================
   汉堡图标按钮
   ==================== */
.topbar__hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 7px;
    width: 36px;
    height: 36px;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 6px;
    border-radius: 6px;
    transition: background 0.3s ease;
}

.topbar__hamburger:hover {
    background: rgba(255, 255, 255, 0.08);
}

.topbar__hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background: rgba(255, 255, 255, 0.75);
    border-radius: 2px;
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.3s ease,
                background 0.3s ease;
    transform-origin: center;
}

/* 汉堡图标激活态 → X 形 */
.topbar__hamburger--active .topbar__hamburger-line:first-child {
    transform: translateY(4.5px) rotate(45deg);
    background: rgba(255, 255, 255, 0.9);
}

.topbar__hamburger--active .topbar__hamburger-line:last-child {
    transform: translateY(-4.5px) rotate(-45deg);
    background: rgba(255, 255, 255, 0.9);
}

/* ====================
   全屏导航遮罩层
   ==================== */
.topbar__overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.96);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s cubic-bezier(0.23, 1, 0.32, 1),
                visibility 0.5s;
}

.topbar__overlay--open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 导航链接容器 */
.topbar__overlay-nav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0 5vw;
    width: 100%;
    max-width: 1200px;
}

/* 单个导航链接 */
.topbar__overlay-link {
    display: flex;
    align-items: baseline;
    text-decoration: none;
    padding: 20px 0;
    width: 100%;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar__overlay-link:last-child {
    border-bottom: none;
}

/* 展开后依次动画出现 */
.topbar__overlay--open .topbar__overlay-link:nth-child(1) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.1s;
}

.topbar__overlay--open .topbar__overlay-link:nth-child(2) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.2s;
}

.topbar__overlay--open .topbar__overlay-link:nth-child(3) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.3s;
}

.topbar__overlay--open .topbar__overlay-link:nth-child(4) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.4s;
}

.topbar__overlay--open .topbar__overlay-link:nth-child(5) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.5s;
}

/* 中文标签 */
.topbar__overlay-label {
    font-size: 3.0rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 4px;
    line-height: 1.3;
    font-family: var(--font-family, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif);
    transition: color 0.3s ease;
}

/* 分隔符 */
.topbar__overlay-divider {
    font-size: 3.0rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.25);
    margin: 0 16px;
    line-height: 1.3;
}

/* 英文文字 */
.topbar__overlay-text {
    font-size: 3.0rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.45);
    letter-spacing: 6px;
    line-height: 1.3;
    font-family: var(--font-family, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);
    transition: color 0.3s ease;
}

/* Hover 效果 */
.topbar__overlay-link:hover .topbar__overlay-label {
    color: #ffffff;
}

.topbar__overlay-link:hover .topbar__overlay-text {
    color: rgba(255, 255, 255, 0.85);
}

.topbar__overlay-link:hover .topbar__overlay-divider {
    color: rgba(255, 255, 255, 0.5);
}

/* 当前页面高亮 */
.topbar__overlay-link.active .topbar__overlay-label {
    color: #ffffff;
}

.topbar__overlay-link.active .topbar__overlay-text {
    color: rgba(255, 255, 255, 0.85);
}

/* ====================
   菜单打开时禁止页面滚动
   ==================== */
body.topbar-menu-open {
    overflow: hidden;
}

/* ====================
   响应式设计
   ==================== */

/* 平板端 */
@media (max-width: 768px) {
    .topbar-container {
        height: 50px;
    }

    .topbar {
        padding: 0 4vw;
    }

    .topbar__left {
        gap: 12px;
    }

    .topbar__logo img {
        height: 36px;
    }

    .topbar__hamburger {
        width: 32px;
        height: 32px;
        gap: 6px;
    }

    .topbar__hamburger-line {
        width: 20px;
    }

    .topbar__hamburger--active .topbar__hamburger-line:first-child {
        transform: translateY(4px) rotate(45deg);
    }

    .topbar__hamburger--active .topbar__hamburger-line:last-child {
        transform: translateY(-4px) rotate(-45deg);
    }

    .topbar__overlay-nav {
        padding: 0 6vw;
    }

    .topbar__overlay-link {
        padding: 16px 0;
    }

    .topbar__overlay-label {
        font-size: 2.2rem;
        letter-spacing: 3px;
    }

    .topbar__overlay-divider {
        font-size: 2.2rem;
        margin: 0 12px;
    }

    .topbar__overlay-text {
        font-size: 2.2rem;
        letter-spacing: 4px;
    }
}

/* 移动端 */
@media (max-width: 480px) {
    .topbar {
        padding: 0 3vw;
    }

    .topbar__left {
        gap: 10px;
    }

    .topbar__logo img {
        height: 32px;
    }

    .topbar__overlay-nav {
        padding: 0 5vw;
    }

    .topbar__overlay-link {
        padding: 14px 0;
    }

    .topbar__overlay-label {
        font-size: 1.6rem;
        letter-spacing: 2px;
    }

    .topbar__overlay-divider {
        font-size: 1.6rem;
        margin: 0 8px;
    }

    .topbar__overlay-text {
        font-size: 1.6rem;
        letter-spacing: 3px;
    }
}