/* 全局重置与变量 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a73e8;
    --primary-light: #4a9eff;
    --primary-dark: #0d47a1;
    --accent: #ff6b35;
    --accent-light: #ff8a5c;
    --green: #34a853;
    --red: #ea4335;
    --bg-primary: #0a0f1e;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);
    --text-primary: #f0f4ff;
    --text-secondary: #b0bec5;
    --text-muted: #78909c;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 渐变背景动画 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 20% 50%, rgba(26, 115, 232, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(255, 107, 53, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(52, 168, 83, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 0.8; }
    100% { transform: scale(0.95); opacity: 0.5; }
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* 通用 */
a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--accent);
}

img, svg {
    max-width: 100%;
    display: block;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

section {
    padding: 5rem 1.5rem;
    position: relative;
    z-index: 1;
}

/* 容器 */
.nav-container, .hero-content, .features-grid, .sports-grid, 
.about-content, .howto-steps, .faq-list, .knowledge-grid,
.contact-info, .footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 15, 30, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

header.scrolled {
    background: rgba(10, 15, 30, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.02);
    color: var(--text-primary);
}

.logo svg {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.nav-links li a {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--primary-light);
    border-radius: 1px;
    transition: transform 0.3s ease;
}

.nav-links li a:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.nav-links li a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.dark-mode-toggle {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.dark-mode-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(15deg);
}

.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg at 50% 50%, transparent, rgba(26, 115, 232, 0.03), transparent, rgba(255, 107, 53, 0.03), transparent);
    animation: heroGlow 20s linear infinite;
    pointer-events: none;
}

@keyframes heroGlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
    padding: 2rem;
}

.hero-content h1 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #f0f4ff 0%, var(--primary-light) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.15;
}

.hero-content p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 0.85rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(26, 115, 232, 0.4);
    color: white;
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
    border-color: var(--primary-light);
    color: var(--text-primary);
}

.hero-visual {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    animation: float 6s ease-in-out infinite;
}

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

.hero-visual svg {
    max-width: 350px;
    height: auto;
    filter: drop-shadow(0 10px 40px rgba(26, 115, 232, 0.2));
}

/* Features */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(255, 255, 255, 0.15);
}

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

.feature-card svg {
    margin: 0 auto 1.25rem;
    width: 56px;
    height: 56px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Sports */
.sports {
    background: var(--bg-primary);
}

.sports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.sport-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.sport-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.1), transparent);
    transition: var(--transition);
}

.sport-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.sport-card:hover::after {
    transform: scale(2);
    opacity: 0.3;
}

.sport-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
    color: var(--primary-light);
}

.sport-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* About */
.about {
    background: var(--bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: 1.2rem;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* Howto */
.howto {
    background: var(--bg-primary);
}

.howto-steps {
    list-style: none;
    counter-reset: step-counter;
    max-width: 700px;
    margin: 0 auto;
}

.howto-steps li {
    counter-increment: step-counter;
    position: relative;
    padding: 1.5rem 1.5rem 1.5rem 4rem;
    margin-bottom: 1rem;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.howto-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 1rem;
    top: 1.5rem;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: white;
    box-shadow: 0 2px 10px rgba(26, 115, 232, 0.3);
}

.howto-steps li:hover {
    transform: translateX(5px);
    border-color: var(--primary);
}

.howto-steps li h3 {
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.howto-steps li p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* FAQ */
.faq {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 750px;
    margin: 0 auto;
}

.faq-list details {
    margin-bottom: 0.75rem;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-list details[open] {
    border-color: var(--primary);
    box-shadow: 0 2px 12px rgba(26, 115, 232, 0.15);
}

.faq-list summary {
    padding: 1.2rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
    user-select: none;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--primary-light);
    transition: transform 0.3s ease;
    font-weight: 300;
}

.faq-list details[open] summary::after {
    transform: rotate(45deg);
}

.faq-list details[open] summary {
    border-bottom: 1px solid var(--border-color);
}

.faq-list details p {
    padding: 1rem 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Knowledge */
.knowledge {
    background: var(--bg-primary);
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.knowledge-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.8rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.knowledge-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 255, 255, 0.12);
}

.knowledge-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.knowledge-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
    flex: 1;
}

.knowledge-card a {
    color: var(--primary-light);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: var(--transition);
}

.knowledge-card a:hover {
    color: var(--accent);
    gap: 0.6rem;
}

/* Contact */
.contact {
    background: var(--bg-secondary);
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    display: grid;
    gap: 1.2rem;
}

.contact-info p {
    color: var(--text-secondary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-info p strong {
    color: var(--text-primary);
    min-width: 120px;
}

/* Footer */
footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.footer-brand .logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
}

.footer-links ul li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0.25rem 0;
}

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

.footer-legal {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-legal p {
    margin-bottom: 0.5rem;
}

.footer-legal a {
    color: var(--text-muted);
    margin: 0 0.25rem;
}

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

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
    transition: var(--transition);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(26, 115, 232, 0.4);
}

/* 滚动动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 768px) {
    header {
        padding: 0;
    }

    .nav-container {
        padding: 0.75rem 1rem;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(10, 15, 30, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li a {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
        text-align: center;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    section {
        padding: 3rem 1rem;
    }

    h2 {
        font-size: 1.6rem;
        margin-bottom: 1.5rem;
    }

    .hero {
        min-height: 90vh;
        padding-top: 5rem;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-visual svg {
        max-width: 250px;
    }

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

    .sports-grid {
        grid-template-columns: 1fr 1fr;
    }

    .knowledge-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-links ul {
        justify-content: center;
    }

    .contact-info {
        padding: 1.5rem;
    }

    .contact-info p {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.2rem;
    }

    .contact-info p strong {
        min-width: auto;
    }

    .howto-steps li {
        padding: 1.2rem 1.2rem 1.2rem 3.5rem;
    }

    .howto-steps li::before {
        left: 0.8rem;
        top: 1.2rem;
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }

    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .sports-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .faq-list summary {
        padding: 1rem 1.2rem;
        font-size: 0.95rem;
    }

    .faq-list details p {
        padding: 0.8rem 1.2rem 1.2rem;
    }
}

/* 暗色模式支持 (默认已暗色) */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #f5f7fa;
        --bg-secondary: #ffffff;
        --bg-card: rgba(255, 255, 255, 0.9);
        --bg-glass: rgba(0, 0, 0, 0.03);
        --text-primary: #1a1a2e;
        --text-secondary: #4a4a6a;
        --text-muted: #888;
        --border-color: rgba(0, 0, 0, 0.08);
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
        --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
        --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
    }

    header {
        background: rgba(255, 255, 255, 0.85);
    }

    header.scrolled {
        background: rgba(255, 255, 255, 0.95);
    }

    .hero-content h1 {
        background: linear-gradient(135deg, #1a1a2e 0%, var(--primary) 50%, var(--accent) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .nav-links li a {
        color: var(--text-secondary);
    }

    .nav-links li a:hover {
        color: var(--primary);
        background: rgba(26, 115, 232, 0.05);
    }

    .mobile-menu-toggle span {
        background: var(--text-primary);
    }

    .dark-mode-toggle {
        background: rgba(0, 0, 0, 0.05);
        border-color: rgba(0, 0, 0, 0.1);
    }

    body::before {
        opacity: 0.3;
    }
}

/* 动画辅助 */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.feature-card, .sport-card, .knowledge-card, .howto-steps li, .faq-list details {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }

.sport-card:nth-child(1) { animation-delay: 0.1s; }
.sport-card:nth-child(2) { animation-delay: 0.2s; }
.sport-card:nth-child(3) { animation-delay: 0.3s; }
.sport-card:nth-child(4) { animation-delay: 0.4s; }

.knowledge-card:nth-child(1) { animation-delay: 0.1s; }
.knowledge-card:nth-child(2) { animation-delay: 0.2s; }
.knowledge-card:nth-child(3) { animation-delay: 0.3s; }
.knowledge-card:nth-child(4) { animation-delay: 0.4s; }
.knowledge-card:nth-child(5) { animation-delay: 0.5s; }
.knowledge-card:nth-child(6) { animation-delay: 0.6s; }

.howto-steps li:nth-child(1) { animation-delay: 0.1s; }
.howto-steps li:nth-child(2) { animation-delay: 0.2s; }
.howto-steps li:nth-child(3) { animation-delay: 0.3s; }
.howto-steps li:nth-child(4) { animation-delay: 0.4s; }
.howto-steps li:nth-child(5) { animation-delay: 0.5s; }

.faq-list details:nth-child(1) { animation-delay: 0.1s; }
.faq-list details:nth-child(2) { animation-delay: 0.2s; }
.faq-list details:nth-child(3) { animation-delay: 0.3s; }
.faq-list details:nth-child(4) { animation-delay: 0.4s; }
.faq-list details:nth-child(5) { animation-delay: 0.5s; }
.faq-list details:nth-child(6) { animation-delay: 0.6s; }
.faq-list details:nth-child(7) { animation-delay: 0.7s; }
.faq-list details:nth-child(8) { animation-delay: 0.8s; }
.faq-list details:nth-child(9) { animation-delay: 0.9s; }
.faq-list details:nth-child(10) { animation-delay: 1.0s; }