@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-ExtraLight-3.otf") format("opentype");
    font-weight: 200;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-Light-5.otf") format("opentype");
    font-weight: 300;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-Regular-1.otf") format("opentype");
    font-weight: 400;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-Medium-6.otf") format("opentype");
    font-weight: 500;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-SemiBold-7.otf") format("opentype");
    font-weight: 600;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-Bold-2.otf") format("opentype");
    font-weight: 700;
}

@font-face {
    font-family: "SourceHanSerifCN";
    src: url("../Fonts/SourceHanSerifCN-Heavy-4.otf") format("opentype");
    font-weight: 900;
}

/* CSS 变量 - 深色主题 */
:root {
    --bg-primary: #000;
    --bg-secondary: #1d1d1f;
    --bg-elevated: #2c2c2e;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --border-color: rgba(245, 245, 247, 0.1);
    --header-bg: rgba(0, 0, 0, 0.8);
    --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.6);
    --card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.8);
    --link-color: #2997ff;
    --link-hover-bg: rgba(41, 151, 255, 0.08);
    --link-active-bg: rgba(41, 151, 255, 0.15);
}

/* 浅色主题 */
[data-theme="light"] {
    --bg-primary: #fff;
    --bg-secondary: #f5f5f7;
    --bg-elevated: #fbfbfd;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --border-color: rgba(0, 0, 0, 0.1);
    --header-bg: rgba(251, 251, 253, 0.8);
    --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.15);
    --link-color: #0066cc;
    --link-hover-bg: rgba(0, 102, 204, 0.08);
    --link-active-bg: rgba(0, 102, 204, 0.15);
}

/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "PingFang SC", "Helvetica Neue", "SourceHanSerifCN", sans-serif;
    margin: 0;
    overflow-x: hidden;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1), color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 视频容器 */
.video-wrapper {
    position: relative;
    width: 100%;
    overflow: hidden;
    transition: height 0.8s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.video-wrapper.full-height {
    height: 100vh;
}

.video-wrapper.cropped {
    height: 500px;
    border-radius: 0 0 28px 28px;
    margin-bottom: 80px;
}

.bg-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 1;
    transition: opacity 0.8s cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--header-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    padding: 12px 0;
    box-sizing: border-box;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.header-content {
    max-width: 980px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 22px;
}

.header-title {
    flex: 1;
    text-align: center;
}

.header h3 {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", sans-serif;
    text-align: center;
    margin: 0;
    font-size: 21px;
    line-height: 1.19048;
    font-weight: 600;
    letter-spacing: 0.011em;
    color: var(--text-primary);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.header h6 {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
    text-align: center;
    margin: 2px 0 0 0;
    font-size: 12px;
    line-height: 1.33337;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--text-secondary);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.header-line {
    width: 100%;
    height: 1px;
    background-color: var(--border-color);
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 主题切换按钮 */
.theme-toggle {
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.theme-toggle:hover {
    background-color: var(--link-hover-bg);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-primary);
    transition: fill 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 滚动提示 */
#scroll-indicator {
    position: fixed;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    color: var(--text-primary);
    z-index: 100;
    cursor: pointer;
    animation: bounce 2s cubic-bezier(0.28, 0.11, 0.32, 1) infinite;
    opacity: 0.8;
    transition: opacity 0.3s ease, color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

#scroll-indicator:hover {
    opacity: 1;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-12px);
    }
}

.arrow {
    color: var(--text-primary);
    font-weight: 400;
    letter-spacing: -0.022em;
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 容器 */
.container {
    padding-top: 0;
    max-width: 100%;
    margin: 0 auto;
}

.page-content.hidden {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.28, 0.11, 0.32, 1), transform 0.8s cubic-bezier(0.28, 0.11, 0.32, 1);
    pointer-events: none;
}

.page-content.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.main {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}

/* 标题和文本 */
.page-title {
    font-size: 56px;
    line-height: 1.07143;
    font-weight: 600;
    letter-spacing: -0.005em;
    text-align: center;
    max-width: 980px;
    margin: 100px auto 0;
    padding: 0 22px;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro SC", "PingFang SC", sans-serif;
    color: var(--text-primary);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-subtitle {
    font-size: 28px;
    line-height: 1.14286;
    font-weight: 400;
    letter-spacing: 0.007em;
    text-align: center;
    max-width: 980px;
    margin: 6px auto 0;
    padding: 0 22px;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro SC", "PingFang SC", sans-serif;
    color: var(--text-secondary);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-intro {
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    max-width: 692px;
    margin: 40px auto 80px;
    padding: 0 22px;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro SC", "PingFang SC", sans-serif;
    color: var(--text-secondary);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-intro p {
    margin: 0 0 1.4em;
}

.page-intro p:last-child {
    margin-bottom: 0;
}

.page-text-contact {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro SC", "PingFang SC", sans-serif;
    font-size: 32px;
    line-height: 1.125;
    font-weight: 600;
    letter-spacing: 0.004em;
    color: var(--text-primary);
    max-width: 980px;
    margin: 120px auto 100px;
    padding: 0 22px;
    text-align: center;
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-text-contact a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-text-contact a:hover {
    text-decoration: underline;
}

.page-list-title {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: 0;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro SC", "PingFang SC", sans-serif;
    color: var(--text-primary);
    margin-bottom: 24px;
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.page-cutline {
    display: none;
}

/* 视频展示区 */
.page-show-video1 {
    width: 100%;
    max-width: 980px;
    margin: 0 auto 120px;
    text-align: center;
    padding: 0 22px;
    box-sizing: border-box;
}

.show-video {
    width: 100%;
    height: auto;
    max-height: 70vh;
    object-fit: contain;
    border-radius: 18px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1), box-shadow 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.show-video:hover {
    transform: scale(1.01);
    box-shadow: var(--card-shadow-hover);
}

/* 按钮 */
.button {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 60px 0 80px;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    text-decoration: none;
    font-size: 17px;
    line-height: 1.17648;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--link-color);
    padding: 12px 22px;
    background-color: transparent;
    border: none;
    border-radius: 980px;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1), color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", sans-serif;
}

.btn img {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    transition: transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.btn:hover {
    background-color: var(--link-hover-bg);
    color: var(--link-color);
}

.btn:hover img {
    transform: translateX(2px);
}

.btn:active {
    background-color: var(--link-active-bg);
}

/* 图片轮播 */
.image-slider {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 18px;
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.image-slider .slides {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.image-slider img {
    width: 100%;
    height: auto;
    flex-shrink: 0;
    border-radius: 0;
    display: block;
}

.dots {
    text-align: center;
    margin-top: 20px;
}

.dot {
    height: 8px;
    width: 8px;
    margin: 0 6px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1), transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    cursor: pointer;
}

.dot:hover {
    background-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.2);
}

.dot.active {
    background-color: #f5f5f7;
    transform: scale(1.3);
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 60px 22px 40px;
    position: relative;
    z-index: 2;
    max-width: 980px;
    margin: 120px auto 0;
    font-size: 12px;
    line-height: 1.33337;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--text-tertiary);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
    border-top: 1px solid var(--border-color);
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1), border-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.footer p {
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 1068px) {
    .page-title {
        font-size: 40px;
        line-height: 1.1;
        margin: 60px auto 20px;
    }
}

@media (max-width: 735px) {
    .page-title {
        font-size: 40px;
        line-height: 1.1;
        margin: 60px auto 0;
    }

    .page-subtitle {
        font-size: 21px;
        line-height: 1.19048;
    }

    .page-intro {
        font-size: 17px;
        line-height: 1.47059;
        margin: 30px auto 60px;
    }

    .page-text-contact {
        font-size: 28px;
        margin: 80px auto 80px;
    }

    .page-list-title {
        font-size: 32px;
    }

    .page-show-video1 {
        margin-bottom: 80px;
    }

    .footer {
        text-align: center;
        padding: 40px 22px 30px;
        margin-top: 80px;
    }

    .theme-toggle {
        right: 12px;
    }
}