/* ============================================
   DataYunk 数允凯 - 苹果风格样式系统
   杭州数允凯科技有限公司
   ============================================ */

/* CSS 变量定义 */
:root {
    /* 颜色系统 */
    --color-white: #FFFFFF;
    --color-off-white: #FAFAFA;
    --color-light-gray: #F5F5F7;
    --color-gray: #86868B;
    --color-dark-gray: #1D1D1F;
    --color-black: #000000;
    --color-primary: #0071E3;
    --color-primary-hover: #0077ED;
    --color-success: #34C759;

    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* 字号 */
    --font-size-xs: 14px;
    --font-size-sm: 16px;
    --font-size-base: 18px;
    --font-size-lg: 24px;
    --font-size-xl: 32px;
    --font-size-2xl: 48px;
    --font-size-3xl: 64px;
    --font-size-4xl: 80px;

    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    --spacing-4xl: 128px;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

    /* 过渡 */
    --transition-fast: 200ms;
    --transition-base: 300ms;
    --transition-slow: 600ms;
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.6, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark-gray);
    background-color: var(--color-white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-base) var(--ease-out);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    transition: all var(--transition-base) var(--ease-out);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

.logo-img {
    height: 32px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-regular);
    color: var(--color-dark-gray);
    opacity: 0.8;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base) var(--ease-out);
}

.nav-link:hover {
    opacity: 1;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-btn {
    background: transparent;
    padding: var(--spacing-xs);
    color: var(--color-dark-gray);
    opacity: 0.8;
}

.search-btn:hover {
    opacity: 1;
}

.search-btn svg {
    fill: currentColor;
}

.cta-btn {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.cta-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 20px;
    height: 2px;
    background: var(--color-dark-gray);
    transition: all var(--transition-base) var(--ease-out);
}

/* ============================================
   Hero 英雄区
   ============================================ */
.hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-off-white) 0%, var(--color-light-gray) 100%);
    position: relative;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark-gray);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray);
    margin-bottom: var(--spacing-xl);
    font-weight: var(--font-weight-regular);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   全宽视频区
   ============================================ */
.video-section {
    width: 100%;
    background: var(--color-black);
    position: relative;
    padding: 0;
}

.hero-video {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}

.video-container {
    position: relative;
    width: 100%;
    background: var(--color-black);
}

.hero-video-player {
    width: 100%;
    height: auto;
    display: block;
    max-height: 80vh;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: all var(--transition-base) var(--ease-out);
    cursor: pointer;
    z-index: 10;
}

.video-overlay:hover {
    background: rgba(0, 0, 0, 0.5);
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.video-play-button {
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.video-play-button:hover {
    transform: scale(1.15);
}

.video-play-button:active {
    transform: scale(0.95);
}

.video-play-button svg {
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.4));
}

/* 旧版产品图片样式（保留兼容） */
.product-hero {
    filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.15));
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
}

.video-section .scroll-indicator .scroll-icon {
    border-color: rgba(255, 255, 255, 0.6);
}

.video-section .scroll-indicator .scroll-icon::before {
    background: rgba(255, 255, 255, 0.6);
}

.scroll-icon {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-gray);
    border-radius: var(--radius-full);
    position: relative;
}

.scroll-icon::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-gray);
    border-radius: 2px;
    animation: scroll-down 2s infinite;
}

@keyframes scroll-down {
    0%, 100% { transform: translate(-50%, 0); opacity: 1; }
    50% { transform: translate(-50%, 12px); opacity: 0.3; }
}

/* ============================================
   按钮样式
   ============================================ */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 12px 32px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    box-shadow: 0 4px 16px rgba(0, 113, 227, 0.2);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 113, 227, 0.3);
}

.btn-primary.large {
    padding: 16px 48px;
    font-size: var(--font-size-base);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    padding: 12px 32px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* ============================================
   产品亮点区
   ============================================ */
.highlights {
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: var(--color-white);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    color: var(--color-dark-gray);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.highlight-card {
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-lg);
    background: var(--color-light-gray);
    transition: all var(--transition-slow) var(--ease-out);
}

.highlight-card:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.highlight-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.highlight-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark-gray);
}

.highlight-desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray);
    line-height: 1.7;
}

/* ============================================
   产品展示区
   ============================================ */
.product-showcase {
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: var(--color-light-gray);
}

.showcase-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.showcase-content {
    padding: var(--spacing-xl);
}

.showcase-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--color-dark-gray);
}

.showcase-desc {
    font-size: var(--font-size-base);
    color: var(--color-gray);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.feature-list {
    margin-bottom: var(--spacing-xl);
}

.feature-list li {
    font-size: var(--font-size-sm);
    color: var(--color-dark-gray);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    padding-left: var(--spacing-lg);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.showcase-image {
    position: relative;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   技术优势区
   ============================================ */
.tech-section {
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: var(--color-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.tech-item {
    padding: var(--spacing-xl);
    border-left: 3px solid var(--color-primary);
    background: var(--color-light-gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-base) var(--ease-out);
}

.tech-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.tech-number {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

.tech-item h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark-gray);
}

.tech-item p {
    font-size: var(--font-size-sm);
    color: var(--color-gray);
}

/* ============================================
   用户评价区
   ============================================ */
.testimonials {
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: var(--color-light-gray);
}

.testimonial-slider {
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial-track {
    display: flex;
    gap: var(--spacing-xl);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.testimonial-track::-webkit-scrollbar {
    display: none;
}

.testimonial-card {
    flex: 0 0 100%;
    max-width: 600px;
    margin: 0 auto;
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    scroll-snap-align: center;
}

.stars {
    color: #FFB800;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    font-size: var(--font-size-base);
    color: var(--color-dark-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

.author-name {
    font-weight: var(--font-weight-semibold);
    color: var(--color-dark-gray);
}

.author-title {
    font-size: var(--font-size-xs);
    color: var(--color-gray);
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.slider-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-gray);
    opacity: 0.3;
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-out);
}

.slider-dot.active {
    opacity: 1;
    background: var(--color-primary);
    transform: scale(1.2);
}

/* ============================================
   CTA区域
   ============================================ */
.cta-section {
    padding: var(--spacing-4xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, #005BB5 100%);
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.cta-section .btn-primary {
    background: var(--color-white);
    color: var(--color-primary);
}

.cta-section .btn-primary:hover {
    background: var(--color-off-white);
    transform: translateY(-3px) scale(1.05);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-dark-gray);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-xl);
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    font-size: var(--font-size-xs);
    color: var(--color-gray);
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-legal p {
    font-size: var(--font-size-xs);
    color: var(--color-gray);
}

.legal-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.legal-links a {
    font-size: var(--font-size-xs);
    color: var(--color-gray);
}

.legal-links a:hover {
    color: var(--color-white);
}

.beian-info {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.beian-info a {
    color: var(--color-gray);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color var(--transition-base) var(--ease-out);
}

.beian-info a:hover {
    color: var(--color-white);
}

.beian-icon {
    height: 14px;
    width: 14px;
    vertical-align: middle;
    margin-right: 2px;
}

.separator {
    color: var(--color-gray);
    opacity: 0.5;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-gray);
    transition: all var(--transition-base) var(--ease-out);
}

.social-links a:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-3px);
}

/* ============================================
   响应式设计 - 平板
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 56px;
        --font-size-3xl: 48px;
        --font-size-2xl: 36px;
    }

    .showcase-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .hero {
        min-height: 50vh;
    }

    .hero-video-player {
        max-height: 60vh;
    }
}

/* ============================================
   响应式设计 - 手机
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 40px;
        --font-size-3xl: 36px;
        --font-size-2xl: 28px;
        --font-size-xl: 24px;
        --spacing-4xl: 64px;
        --spacing-3xl: 48px;
    }

    .nav-menu {
        position: fixed;
        top: 48px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: saturate(180%) blur(20px);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base) var(--ease-out);
        box-shadow: var(--shadow-md);
    }

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

    .nav-actions {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero {
        flex-direction: column;
        padding: var(--spacing-3xl) var(--spacing-md);
        min-height: auto;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta button {
        width: 100%;
    }

    .hero-video-player {
        max-height: 50vh;
    }

    .video-play-button svg {
        width: 80px;
        height: 80px;
    }

    .scroll-indicator {
        display: none;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .beian-info {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .separator {
        display: none;
    }
}

/* ============================================
   视频弹窗样式
   ============================================ */
.video-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base) var(--ease-out);
}

.video-modal.active {
    display: flex;
    opacity: 1;
}

.video-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 1200px;
    z-index: 2;
    animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.9) translateY(20px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.video-modal-content video {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.video-close-btn {
    position: absolute;
    top: -50px;
    right: 0;
    background: transparent;
    color: var(--color-white);
    padding: var(--spacing-sm);
    cursor: pointer;
    opacity: 0.8;
    transition: all var(--transition-base) var(--ease-out);
    z-index: 3;
}

.video-close-btn:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.video-close-btn svg {
    stroke: currentColor;
}

/* 移动端视频弹窗优化 */
@media (max-width: 768px) {
    .video-modal-content {
        width: 95%;
        max-width: none;
    }

    .video-close-btn {
        top: -40px;
        right: -5px;
    }

    .video-modal-content video {
        border-radius: var(--radius-md);
    }
}