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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Language Switcher */
.language-switcher {
    position: relative;
    margin-left: 20px;
}

.lang-icon-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1.5px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.lang-icon-btn:hover {
    background: var(--primary-color);
    color: white;
}

.lang-icon {
    font-size: 18px;
    line-height: 1;
}

.lang-current {
    font-size: 13px;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    overflow: hidden;
}

.language-switcher.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-dark);
    text-align: left;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
}

.lang-option:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.lang-option.active {
    background: var(--primary-color);
    color: white;
    font-weight: 500;
}

.lang-btn:hover {
    background: var(--primary-color);
    color: white;
}

.lang-btn.active {
    background: var(--primary-color);
    color: white;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 999;
    padding: 15px 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 100px 20px 50px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><path d="M0 0L100 100M100 0L0 100" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    padding: 0 10px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    word-wrap: break-word;
    hyphens: auto;
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-tagline {
    font-size: 1.3rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.hero-tagline-en {
    font-size: 1.1rem;
    opacity: 0.85;
}

/* Section Styles */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
    position: relative;
    padding-bottom: 20px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Content Box */
.content-box {
    max-width: 900px;
    margin: 0 auto;
}

.content-text {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--text-light);
    text-align: justify;
}

/* Highlights Grid */
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.highlight-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.highlight-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.highlight-number {
    min-width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
}

.highlight-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-dark);
}

/* Partnership Grid */
.partnership-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.partnership-card {
    background: var(--bg-white);
    padding: 35px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.partnership-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.partnership-name {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.partnership-desc {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-light);
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.benefit-item {
    background: var(--bg-white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.benefit-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.benefit-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.benefit-desc {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-light);
}

/* Gallery Carousel */
.gallery-carousel {
    margin-top: 40px;
}

.carousel-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-light);
}

.carousel-slides {
    display: flex;
    transition: transform 0.5s ease-in-out;
    width: 100%;
}

.carousel-slide {
    min-width: 100%;
    height: 500px;
    object-fit: cover;
    display: block;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 24px;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
    box-shadow: var(--shadow);
}

.carousel-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn-prev {
    left: 20px;
}

.carousel-btn-next {
    right: 20px;
}

.carousel-indicators {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.carousel-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: 2px solid white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-indicator.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: scale(1.2);
}

.carousel-indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* Contact Section */
.contact-box {
    max-width: 600px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 30px;
}

.contact-icon {
    font-size: 3rem;
}

.contact-info h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.contact-info a {
    font-size: 1.1rem;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-info a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer-text {
    font-size: 0.95rem;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1.3rem;
        line-height: 1.3;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-tagline-en {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 15px;
        display: none;
    }

    .nav-right {
        gap: 10px;
    }

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

    .language-switcher {
        margin-left: 10px;
    }

    .lang-icon-btn {
        padding: 6px 10px;
        gap: 4px;
    }

    .lang-icon {
        font-size: 16px;
    }

    .lang-current {
        font-size: 12px;
    }

    .lang-dropdown {
        min-width: 100px;
    }

    .lang-option {
        padding: 8px 12px;
        font-size: 13px;
    }

    /* Hide text on mobile, show only icon */
    .lang-current {
        display: none;
    }

    .navbar {
        padding: 10px 0;
    }

    .logo {
        font-size: 18px;
    }

    .carousel-slide {
        height: 300px;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .carousel-btn-prev {
        left: 10px;
    }

    .carousel-btn-next {
        right: 10px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 15px 40px;
    }

    .hero-title {
        font-size: 1.6rem;
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        line-height: 1.3;
    }

    .section {
        padding: 50px 0;
    }

    .highlight-card,
    .partnership-card,
    .benefit-item {
        padding: 20px;
    }

    .carousel-slide {
        height: 250px;
    }

    .carousel-btn {
        width: 35px;
        height: 35px;
        font-size: 18px;
    }

    .carousel-indicator {
        width: 10px;
        height: 10px;
    }

    .language-switcher {
        margin-left: 8px;
    }

    .lang-icon-btn {
        padding: 5px 8px;
        gap: 3px;
    }

    .lang-icon {
        font-size: 14px;
    }

    .lang-current {
        font-size: 11px;
    }

    .lang-dropdown {
        min-width: 90px;
    }

    .lang-option {
        padding: 7px 10px;
        font-size: 12px;
    }

    .nav-right {
        gap: 8px;
    }
}