* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Jost', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #333;
    overflow-x: hidden;
    background: #000;
}

/* 全屏Hero区域 */
.hero-section {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 700px;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    padding: 60px 80px;
}

/* 视频背景 */
.hero-bg-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

/* 图片背景 */
.hero-bg-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hydraulic-pump.jpg');
    background-size: cover;
    background-position: center;
    z-index: 1;
}

/* 背景遮罩 */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(0, 0, 0, 0.5) 0%,
        rgba(0, 0, 0, 0.3) 50%,
        rgba(0, 0, 0, 0.6) 100%
    );
    z-index: 2;
}

/* Hero内容 */
.hero-content {
    position: relative;
    z-index: 3;
    color: #fff;
    max-width: 800px;
}

.hero-subtitle {
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.hero-subtitle::before {
    content: '';
    width: 40px;
    height: 2px;
    background: #dd3232;
}

.hero-title {
    font-size: clamp(48px, 8vw, 100px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 30px;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.hero-title span {
    color: #dd3232;
}

.hero-description {
    font-size: 18px;
    font-weight: 300;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
}

/* 滚动提示 */
.scroll-indicator {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.8), rgba(255,255,255,0));
    margin-bottom: 15px;
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: #dd3232;
    animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
    0% {
        top: -20px;
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        top: 60px;
        opacity: 0;
    }
}

.scroll-indicator span {
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

.scroll-indicator:hover span {
    color: #fff;
}

/* 导航栏 */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.nav-bar.scrolled {
    background: rgba(0, 0, 0, 0.9);
    padding: 15px 60px;
    backdrop-filter: blur(10px);
}

.nav-logo {
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    letter-spacing: 3px;
}

.nav-logo span {
    color: #dd3232;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: #fff;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #dd3232;
    transition: width 0.3s ease;
}

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

/* 内容区块 */
.content-section {
    position: relative;
    background: #fff;
    padding: 120px 80px;
}

.content-section.dark {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    position: relative;
}

.content-section.dark::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/fadongjisiergedetu.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    z-index: 0;
}

.content-section.dark .section-container {
    position: relative;
    z-index: 1;
}

/* 视频背景区块 */
.video-section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.video-bg .fallback-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-bg video {
    position: absolute;
    top: 0;
    left: 0;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(0, 0, 0, 0.7) 0%,
        rgba(0, 0, 0, 0.4) 50%,
        rgba(0, 0, 0, 0.8) 100%
    );
    z-index: 2;
}

.video-content {
    position: relative;
    z-index: 3;
    padding: 100px 80px;
    max-width: 100%;
}

.video-content .section-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.video-content .content-text {
    color: #fff;
}

.video-content .section-label {
    color: #dd3232;
}

.video-content .section-label::before {
    background: #dd3232;
}

.video-content .section-title {
    color: #fff;
    font-size: clamp(36px, 5vw, 56px);
}

.video-content .section-description {
    color: rgba(255, 255, 255, 0.8);
}

.video-feature-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 40px;
    transition: all 0.3s ease;
}

.video-feature-card:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.video-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.video-feature-item:last-child {
    margin-bottom: 0;
}

.video-feature-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #dd3232 0%, #ff5252 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.video-feature-icon i {
    font-size: 20px;
    color: #fff;
}

.video-feature-text h4 {
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.video-feature-text p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

.play-button-large {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: rgba(221, 50, 50, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
    box-shadow: 0 0 60px rgba(221, 50, 50, 0.4);
}

.play-button-large:hover {
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow: 0 0 80px rgba(221, 50, 50, 0.6);
}

.play-button-large i {
    font-size: 36px;
    color: #fff;
    margin-left: 5px;
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 两栏布局 */
.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.two-column.reverse {
    direction: rtl;
}

.two-column.reverse > * {
    direction: ltr;
}

.content-text {
    padding-right: 40px;
}

.two-column.reverse .content-text {
    padding-right: 0;
    padding-left: 40px;
}

.section-label {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: #dd3232;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.section-label::before {
    content: '';
    width: 30px;
    height: 2px;
    background: #dd3232;
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 30px;
    color: #333;
}

.content-section.dark .section-title {
    color: #fff;
}

.section-description {
    font-size: 16px;
    line-height: 1.9;
    color: #666;
    margin-bottom: 30px;
}

.content-section.dark .section-description {
    color: rgba(255, 255, 255, 0.7);
}

.content-image {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

.content-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.6s ease;
}

.content-image:hover img {
    transform: scale(1.05);
}

/* 价值观网格 */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.value-card {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.value-card:hover {
    background: #fff;
    border-color: rgba(221, 50, 50, 0.2);
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.content-section.dark .value-card {
    background: rgba(255, 255, 255, 0.05);
}

.content-section.dark .value-card:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(221, 50, 50, 0.3);
}

.value-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #dd3232 0%, #ff5252 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
}

.value-icon i {
    font-size: 24px;
    color: #fff;
}

.value-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.content-section.dark .value-title {
    color: #fff;
}

.value-text {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
}

.content-section.dark .value-text {
    color: rgba(255, 255, 255, 0.6);
}

/* 统计数字 */
.stats-section {
    background: linear-gradient(135deg, #dd3232 0%, #ff5252 100%);
    padding: 100px 80px;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/about-background.jpg') center/cover;
    opacity: 0.1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    color: #fff;
}

.stat-number {
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.9;
}

/* 全屏图文区块 */
.fullwidth-section {
    position: relative;
    height: 80vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.fullwidth-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.fullwidth-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.3) 100%);
}

.fullwidth-content {
    position: relative;
    z-index: 2;
    padding: 0 80px;
    max-width: 600px;
    color: #fff;
}

/* Footer */
.footer-section {
    background: #0a0a0a;
    padding: 60px 80px 30px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 2px;
}

.footer-logo span {
    color: #dd3232;
}

.footer-copyright {
    text-align: center;
    padding-top: 30px;
    font-size: 13px;
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Hero入场动画 */
.hero-content {
    animation: heroFadeIn 1.2s ease-out forwards;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    animation: slideIn 0.8s ease-out 0.3s forwards;
    opacity: 0;
}

.hero-title {
    animation: slideIn 0.8s ease-out 0.5s forwards;
    opacity: 0;
}

.hero-description {
    animation: slideIn 0.8s ease-out 0.7s forwards;
    opacity: 0;
}

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

/* 滚动指示器动画 */
.scroll-indicator {
    animation: fadeInUp 0.8s ease-out 1.2s forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* 响应式 */
@media (max-width: 1200px) {
    .hero-section {
        padding: 60px;
    }
    .content-section {
        padding: 80px 60px;
    }
    .two-column {
        gap: 60px;
    }
}

@media (max-width: 992px) {
    .nav-bar {
        padding: 15px 30px;
    }
    .nav-links {
        display: none;
    }
    .hero-section {
        padding: 40px;
    }
    .content-section {
        padding: 60px 40px;
    }
    .two-column {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .two-column.reverse {
        direction: ltr;
    }
    .content-text {
        padding-right: 0;
    }
    .two-column.reverse .content-text {
        padding-left: 0;
    }
    .values-grid {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .video-content {
        padding: 60px 40px;
    }
    .video-content .section-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 30px;
        min-height: 600px;
    }
    .hero-title {
        font-size: 36px;
    }
    .content-section {
        padding: 40px 20px;
    }
    .stats-section {
        padding: 60px 20px;
    }
    .fullwidth-content {
        padding: 0 30px;
    }
    .footer-section {
        padding: 40px 20px 20px;
    }
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}