/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 定义CSS变量 - 水波主题配色 */
:root {
    --primary-color: #00bcd4;
    --secondary-color: #0097a7;
    --accent-color: #00e5ff;
    --dark-bg: #0a1929;
    --darker-bg: #051018;
    --card-bg: #112240;
    --text-primary: #ffffff;
    --text-secondary: #8892b0;
    --gradient-1: linear-gradient(135deg, #00bcd4 0%, #0097a7 100%);
    --gradient-2: linear-gradient(135deg, #0097a7 0%, #00e5ff 100%);
    --shadow: 0 10px 40px rgba(0, 188, 212, 0.15);
    --transition: all 0.3s ease;
}

/* 基础样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 25, 41, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.nav-brand {
    font-size: 24px;
    font-weight: bold;
}

.brand-link {
    color: var(--primary-color);
    text-decoration: none;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition);
}

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

.explore-btn {
    background: var(--gradient-1);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.explore-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero区域 - 水波背景 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 60px;
}

.wave-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0.1;
    border-radius: 40% 40% 0 0;
    animation: wave 15s ease-in-out infinite;
}

.wave-bg-2 {
    opacity: 0.15;
    animation: wave 12s ease-in-out infinite reverse;
    animation-delay: -2s;
}

.wave-bg-3 {
    opacity: 0.2;
    animation: wave 18s ease-in-out infinite;
    animation-delay: -4s;
}

@keyframes wave {
    0%, 100% {
        transform: translateX(-25%) translateY(0);
    }
    50% {
        transform: translateX(0) translateY(-20px);
    }
}

/* 轮播图样式 */
.slider {
    position: relative;
    width: 100%;
    max-width: 900px;
    text-align: center;
    z-index: 1;
}

.slide {
    display: none;
    animation: fadeIn 0.5s ease;
}

.slide.active {
    display: block;
}

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

.slide-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.slide-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    background: var(--gradient-1);
    color: var(--text-primary);
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 188, 212, 0.3);
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

/* 通用区块样式 */
.section {
    padding: 80px 0;
    position: relative;
}

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

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.wave-divider {
    width: 100px;
    height: 3px;
    background: var(--gradient-1);
    margin: 0 auto 50px;
    border-radius: 2px;
    position: relative;
}

.wave-divider::before,
.wave-divider::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    animation: pulse 2s ease-in-out infinite;
}

.wave-divider::before {
    left: -30px;
}

.wave-divider::after {
    right: -30px;
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% {
        transform: translateY(-50%) scale(1);
        opacity: 1;
    }
    50% {
        transform: translateY(-50%) scale(1.5);
        opacity: 0.5;
    }
}

/* 卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    transition: var(--transition);
    border: 1px solid rgba(0, 188, 212, 0.1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.card-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid rgba(136, 146, 176, 0.2);
}

.card-stats span {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 资料分类 */
.resource-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.category-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 188, 212, 0.1);
}

.category-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow);
}

.category-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.category-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.resource-count {
    font-size: 32px;
    font-weight: bold;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 应用领域 */
.field-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.field-item {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 188, 212, 0.1);
}

.field-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.field-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.field-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.field-item p {
    color: var(--text-secondary);
}

/* 底部样式 */
.footer {
    background: var(--darker-bg);
    padding: 60px 0 30px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 15px;
    background: var(--card-bg);
    border-radius: 8px;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--gradient-1);
    color: var(--text-primary);
}

.subscribe-form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.subscribe-form input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid rgba(136, 146, 176, 0.3);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

.subscribe-form input:focus {
    border-color: var(--primary-color);
}

.subscribe-form button {
    padding: 12px 25px;
    background: var(--gradient-1);
    color: var(--text-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.subscribe-form button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(136, 146, 176, 0.2);
}

.footer-bottom p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.footer-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--dark-bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .slide-content h1 {
        font-size: 32px;
    }

    .slide-content p {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .cards-grid,
    .resource-categories,
    .field-grid {
        grid-template-columns: 1fr;
    }

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

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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