:root {
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --secondary-color: #1e88e5;
    --accent-color: #1e88e580;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

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

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

.nav-actions {
    display: flex;
    gap: 1rem;
}

/* 按钮 */
.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
    text-decoration: none;
}

.btn-secondary {
    display: inline-block;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
}

.btn-outline {
    display: inline-block;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.875rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    text-decoration: none;
}

.btn-large {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    border-radius: 12px;
    text-decoration: none;
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, #1e88e515 0%, #1e88e525 100%);
    padding: 6rem 0 4rem;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.gradient-text {
    display: block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-features {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat-item {
    text-align: left;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Hero 视觉效果 */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-card {
    position: relative;
    background: white;
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s, box-shadow 0.3s;
    width: 360px;
}

.card-1 {
    z-index: 2;
}

.card-1:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 25px 40px -5px rgba(0, 0, 0, 0.15), 0 15px 15px -5px rgba(0, 0, 0, 0.08);
}

.card-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ff6b6b, #ee5a6f);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.card-image {
    width: 100%;
    height: 240px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    margin-bottom: 1.25rem;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 平台介绍 */
.intro-section {
    padding: 4rem 0;
    background: white;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-text {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    text-align: justify;
}

.intro-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 功能特色 */
.features-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-icon-wrapper {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-svg {
    width: 32px;
    height: 32px;
    color: white;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.feature-list strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 最新更新 */
.updates-section {
    padding: 4rem 0;
    background: white;
}

.updates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.update-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s;
}

.update-card:hover {
    border-color: var(--primary-color);
}

.update-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.update-list {
    list-style: none;
}

.update-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
}

.update-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
    line-height: 1.3;
}

.update-list strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 即将推出 */
.upcoming-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.upcoming-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.upcoming-item {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s;
}

.upcoming-item:hover {
    transform: translateY(-5px);
}

.upcoming-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.upcoming-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 邀请计划 */
.invite-section {
    padding: 4rem 0;
    background: white;
}

.invite-intro {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
}

.invite-intro strong {
    color: var(--primary-color);
    font-weight: 600;
}

.invite-highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    margin-bottom: 2rem;
}

.invite-highlight p {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.highlight-text {
    font-size: 1.75rem;
    font-weight: 700;
}

.invite-methods,
.invite-rules {
    margin-top: 3rem;
}

.invite-methods h3,
.invite-rules h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.method-item {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    font-weight: 500;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.method-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.invite-rules ul {
    list-style: none;
}

.invite-rules ul li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.125rem;
}

.invite-rules ul li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.25rem;
}

.invite-rules ul ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.invite-rules strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* CTA 区域 */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.cta-content {
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.cta-section .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-brand .brand-name {
    color: white;
    -webkit-text-fill-color: white;
}

.footer-brand .logo-icon {
    filter: brightness(0) invert(1);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: color 0.3s;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* 语言切换器 */
.language-switcher {
    position: relative;
    margin-right: 1rem;
}

.current-language {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.current-language::after {
    content: '▼';
    font-size: 0.75rem;
    transition: transform 0.3s;
}

.language-switcher.active .current-language::after {
    transform: rotate(180deg);
}

.current-language:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    z-index: 1000;
}

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

.language-option {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text-secondary);
    font-weight: 500;
}

.language-option:first-child {
    border-radius: 8px 8px 0 0;
}

.language-option:last-child {
    border-radius: 0 0 8px 8px;
}

.language-option:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.language-option.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    /* 移动端隐藏英雄视觉卡片 */
    .hero-visual {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .nav-menu {
        display: none;
    }

    .features-grid,
    .updates-grid {
        grid-template-columns: 1fr;
    }

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

    /* 移动端隐藏语言切换按钮 */
    .language-switcher {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-features {
        display: flex;
        flex-direction: row;
        gap: 0.5rem;
        justify-content: space-between;
        flex-wrap: nowrap;
    }

    .feature-tag {
        flex: 1;
        padding: 0.5rem 0.5rem;
        font-size: 0.75rem;
        gap: 0.25rem;
        justify-content: center;
    }

    .feature-tag span {
        display: block;
        text-align: center;
    }

    .feature-icon {
        width: 16px;
        height: 16px;
    }

    .hero-stats {
        display: flex;
        flex-direction: row;
        gap: 1rem;
        justify-content: space-between;
    }

    .stat-item {
        flex: 1;
        text-align: center;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .btn-secondary,
    .btn-primary {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
}