html {
    height: 100%;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    min-height: 100vh;
    height: 100%;
    background-image: url('../images/background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: white;
    position: relative;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

main {
    position: relative;
    z-index: 2;
    display: block;
    min-height: calc(100vh - 200px);
    padding: 2rem;
}

header {
    position: relative;
    z-index: 2;
    padding: 2rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 50px;
    width: auto;
}

.logo-container h1 {
    font-size: 2.5rem;
    font-weight: bold;
    color: white;
}

.content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px 60px 20px;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.download-container {
    position: relative;
    z-index: 2;
    margin-top: 40px;
    text-align: center;
}

.download-button {
    display: inline-block;
    padding: 12px 30px;
    font-size: 18px;
    color: white;
    text-decoration: none;
    background-color: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.download-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.content h2 {
    font-size: 3rem;
    margin-bottom: 2rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.content p {
    font-size: 1.5rem;
    line-height: 1.8;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
    color: rgba(255, 255, 255, 0.75);
}

@media (max-width: 768px) {
    header {
        padding: 1rem 2rem;
    }

    .logo-container h1 {
        font-size: 1.8rem;
    }

    .download-button {
        padding: 0.6rem 1.5rem;
        font-size: 1rem;
    }

    .content h2 {
        font-size: 2rem;
    }

    .content p {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .logo-container h1 {
        font-size: 1.5rem;
    }

    .logo {
        height: 40px;
    }

    .download-button {
        padding: 0.5rem 1.2rem;
        font-size: 0.9rem;
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-selector select {
    padding: 8px 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    padding-right: 35px;
}

.language-selector {
    position: relative;
}

.language-selector::after {
    content: "▼";
    font-size: 12px;
    color: white;
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.language-selector select:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.language-selector select:focus {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.6);
}

.language-selector select option {
    background-color: #2c3e50;
    color: white;
    padding: 10px;
}

footer {
    position: relative;
    z-index: 2;
    width: 100%;
    text-align: center;
    padding: 1rem 0;
    color: rgba(255, 255, 255, 0.75);
    background: #000;
}

footer a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.footer-sep {
    margin: 0 8px;
    color: rgba(255,255,255,0.4);
    font-weight: bold;
    font-size: 1.1em;
}
.footer-link {
    color: #b3d1ff;
    text-decoration: underline;
    margin: 0 2px;
    transition: color 0.2s;
}
.footer-link:hover {
    color: #fff;
}
.footer-copyright {
    color: rgba(255,255,255,0.7);
    font-size: 1em;
}

/* 顶部菜单栏样式 */
.navbar {
    margin-left: 2rem;
}
.navbar ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}
.navbar li {
    display: inline-block;
}
.navbar a {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    padding: 8px 16px;
    border-radius: 20px;
    transition: background 0.2s;
}
.navbar a:hover, .navbar a.active {
    background: rgba(255,255,255,0.15);
}

/* 产品功能介绍分屏样式 */
.features-section {
    width: 100%;
    margin: 0 auto 40px auto;
    display: block;
    gap: 0;
    position: relative;
    z-index: 2;
}
/* 强制产品功能卡片背景为图片 */
.feature-slide {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 40px;
    border-radius: 24px;
    padding: 32px 24px;
    max-width: 900px;
    width: 100%;
    box-shadow: 0 8px 32px 0 rgba(30,34,54,0.22), 0 1.5px 8px 0 rgba(44,62,80,0.10);
    margin: 60px auto 60px auto;
    min-height: 320px;
    text-align: left;
    background: none !important;
    background-color: transparent !important;
}
.feature-slide::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    background: linear-gradient(135deg, rgba(30,34,54,0.60) 60%, rgba(44,62,80,0.50) 100%), url('../images/bk1.png') center/cover no-repeat;
    opacity: 1;
    pointer-events: none;
    border-radius: 24px;
}
.feature-img, .feature-text {
    position: relative;
    z-index: 1;
}
.feature-slide {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 40px;
    border-radius: 24px;
    padding: 32px 24px;
    max-width: 900px;
    width: 100%;
    box-shadow: 0 8px 32px 0 rgba(30,34,54,0.22), 0 1.5px 8px 0 rgba(44,62,80,0.10);
    margin: 60px auto 60px auto;
    min-height: 320px;
    text-align: left;
}
.feature-img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
    flex-shrink: 0;
    background: #fff2;
}
.feature-text {
    max-width: 400px;
    flex: 1;
}
.feature-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #fff;
}
.feature-text p {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.85);
}

/* 公司信息区样式 */
.company-section {
    background: linear-gradient(135deg, rgba(36,54,94,0.96) 60%, rgba(52,82,123,0.92) 100%);
    border-radius: 20px;
    margin: 60px auto 60px auto;
    padding: 32px 24px;
    max-width: 900px;
    width: 100%;
    text-align: left;
    color: #fff;
    box-shadow: 0 8px 32px 0 rgba(30,34,54,0.22), 0 1.5px 8px 0 rgba(44,62,80,0.10);
    min-height: 320px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.company-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}
.company-section p {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: rgba(255,255,255,0.85);
}
.company-info-list {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 22px;
    align-items: flex-start;
}
.company-info-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    font-size: 1.15rem;
    background: rgba(255,255,255,0.07);
    border-radius: 12px;
    padding: 14px 18px;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 1px 6px rgba(0,0,0,0.07);
}
.company-label {
    font-weight: bold;
    min-width: 90px;
    color: #e0e6f6;
}
.company-value {
    color: #fff;
    word-break: break-all;
    margin-left: 8px;
}

.feature-slide, .company-section {
    box-shadow: 0 8px 32px 0 rgba(30,34,54,0.28), 0 2px 8px 0 rgba(44,62,80,0.13), 0 0.5px 1.5px 0 rgba(255,255,255,0.08) inset;
    border: 1.5px solid rgba(255,255,255,0.13);
    backdrop-filter: blur(2.5px);
    -webkit-backdrop-filter: blur(2.5px);
    outline: 1.5px solid rgba(255,255,255,0.10);
    outline-offset: -4px;
    transition: box-shadow 0.3s, transform 0.3s;
}
.feature-slide:hover, .company-section:hover {
    box-shadow: 0 16px 48px 0 rgba(30,34,54,0.38), 0 4px 16px 0 rgba(44,62,80,0.18), 0 1px 3px 0 rgba(255,255,255,0.10) inset;
    transform: translateY(-4px) scale(1.015);
}

@media (max-width: 900px) {
    .feature-slide {
        flex-direction: column !important;
        gap: 20px;
        padding: 18px 4vw;
        text-align: center;
        min-width: 0;
        width: 96vw;
        max-width: 99vw;
        margin: 32px auto;
    }
    .feature-img {
        width: 60vw;
        max-width: 220px;
        min-width: 120px;
        height: 60vw;
        max-height: 220px;
        min-height: 120px;
    }
    .feature-text {
        max-width: 100%;
        padding: 0 2vw;
    }
    .company-section {
        padding: 18px 4vw;
        width: 96vw;
        max-width: 99vw;
        margin: 32px auto;
        min-width: 0;
    }
    .company-info-list {
        max-width: 100%;
        gap: 12px;
    }
    .company-info-item {
        font-size: 1rem;
        padding: 10px 8px;
    }
}
@media (max-width: 600px) {
    header {
        flex-direction: column;
        padding: 0.5rem 0.5rem 0 0.5rem;
        gap: 8px;
    }
    .logo {
        height: 32px;
    }
    .logo-container h1 {
        font-size: 1.1rem;
    }
    .navbar {
        margin-left: 0;
        width: 100%;
    }
    .navbar ul {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
        align-items: flex-start;
        background: rgba(30,34,54,0.92);
        border-radius: 12px;
        padding: 6px 0;
    }
    .navbar li {
        width: 100%;
    }
    .navbar a {
        font-size: 1rem;
        padding: 8px 18px;
        display: block;
        width: 100%;
        border-radius: 8px;
    }
    .content {
        padding: 40px 4vw 24px 4vw;
        min-height: 60vh;
    }
    .download-button {
        padding: 0.7rem 1.2rem;
        font-size: 1rem;
        border-radius: 18px;
    }
    .feature-slide {
        flex-direction: column !important;
    }
    .feature-slide, .company-section {
        border-radius: 14px;
        min-height: 0;
        padding: 12px 2vw;
    }
    .feature-img {
        width: 80vw;
        max-width: 160px;
        min-width: 80px;
        height: 80vw;
        max-height: 160px;
        min-height: 80px;
    }
    .feature-text h3 {
        font-size: 1.1rem;
    }
    .feature-text p {
        font-size: 0.95rem;
    }
    .company-section h2 {
        font-size: 1.1rem;
    }
    .company-info-item {
        font-size: 0.95rem;
        padding: 8px 4px;
        border-radius: 8px;
    }
    .scroll-down-tip {
        font-size: 0.95rem;
        margin-top: 32px;
    }
    .arrow-down {
        width: 22px;
        height: 22px;
        border-width: 3px;
    }
    footer {
        font-size: 0.92em;
        flex-wrap: wrap;
        line-height: 1.7;
        padding: 0.7em 0.2em;
    }
    .footer-sep {
        margin: 0 4px;
    }
    .footer-copyright {
        display: block;
        margin: 4px 0;
    }
} 

.scroll-down-tip {
    margin-top: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    font-size: 1.1rem;
    opacity: 0.85;
    animation: fadeInUp 1.2s;
}
.arrow-down {
    width: 32px;
    height: 32px;
    margin-top: 8px;
    border-left: 4px solid #fff;
    border-bottom: 4px solid #fff;
    transform: rotate(-45deg);
    animation: arrowBounce 1.2s infinite;
    opacity: 0.8;
}
@keyframes arrowBounce {
    0%, 100% { transform: translateY(0) rotate(-45deg); }
    50% { transform: translateY(12px) rotate(-45deg); }
}
@keyframes fadeInUp {
    0% { opacity: 0; transform: translateY(30px); }
    100% { opacity: 0.85; transform: translateY(0); }
}