/* Reset and Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Theme Variables */
:root {
    /* Colors */
    --bg-primary: #f4f4f4;
    --bg-secondary: #f8f9fa;
    --bg-grid: #e2e2e2;
    --bg-tertiary: #f1f3f4;
    --nav-scroll-bg: #c3c3c340;
    --text-primary: #333333;
    --text-secondary: #494949;
    --led-text: #fff;
    --led-text-shadow: #00abe5;
    --google-blue: #4285F4;
    --google-red: #DB4437;
    --google-yellow: #F4B400;
    --google-green: #0F9D58;

    /* Interaction Colors */
    --hover-overlay: rgba(0, 0, 0, 0.05);
    --active-overlay: rgba(0, 0, 0, 0.1);

    /* Derived Colors */
    --nav-bg: rgba(255, 255, 255, 0.6);
    --nav-bg-dark: rgba(26, 26, 26, 0.6);
    --card-bg: #ffffff;
    --card-border: #e0e0e0;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-nav: 0 8px 32px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-all: all var(--transition-normal);
    --transition-transform: transform var(--transition-normal);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Container */
    --container-width: 1200px;
    --content-width: 800px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-5xl: 50px;

    /* Navbar */
    --nav-height: 5rem;
}

.highlight-color-green {
    background-color: #4adbc899;
}

.highlight-color-purple {
    background-color: #6335ed66;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-grid: #333333;
    --bg-tertiary: #333333;
    --nav-scroll-bg: #9e9e9e40;
    --led-text: lch(81 55.6 211.56);
    --led-text-shadow: lch(68 51.7 231.99 / 0.7);
    /*--line-color: rgb(from var(--bg-primary) r g b / 0.2);*/
    --text-primary: #ffffff;
    --text-secondary: #dddddd;
    --nav-bg: var(--nav-bg-dark);
    --card-bg: #2d2d2d;
    --card-border: #404040;
    --hover-overlay: rgba(255, 255, 255, 0.05);
    --active-overlay: rgba(255, 255, 255, 0.1);
}

/* Enhanced Typography */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Progress Bar */
.progress-bar {
    position: fixed;
    bottom: 0;
    left: calc(var(--radius-5xl) / 2);
    width: 0;
    height: 3px;
    background: linear-gradient(to right, var(--google-blue), var(--google-red), var(--google-yellow), var(--google-green));
    z-index: 1001;
    transition: width var(--transition-fast) linear;
}

/* Enhanced Layout */
.easter-egg-landing {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    /* background-image:
            radial-gradient(circle at 100% 100%, var(--bg-secondary) 0%, transparent 50%),
            radial-gradient(circle at 0% 0%, var(--bg-secondary) 0%, transparent 50%); */
    background-image: linear-gradient(var(--bg-grid) 1px, transparent 1px), linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: 3em 3em;
}

/* Enhanced Navigation */
.easter-egg-nav {
    position: fixed;
    top: var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--nav-bg);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    box-shadow: var(--shadow-nav);
    border-radius: var(--radius-5xl);
    width: 90%;
    max-width: 1000px;
    transition: var(--transition-all);
}

/* Add new styles for scrolled state */
.easter-egg-nav.scrolled {
    top: var(--spacing-xs);
    padding: calc(var(--spacing-xs) * 0.6) var(--spacing-sm);
    transform: translateX(-50%) translateY(-2px);
    box-shadow: var(--shadow-nav);
    border: 1px solid rgba(255, 255, 255, 0.25);
    background-color: var(--nav-scroll-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

[data-theme="dark"] .easter-egg-nav.scrolled {
    background-color: var(--nav-scroll-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.easter-egg-nav.scrolled:hover {
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .easter-egg-nav.scrolled:hover {
    background-color: rgba(45, 45, 45, 0.95);
}

.easter-egg-nav.scrolled .easter-egg-nav__brand {
    font-size: 1.1rem;
}
.easter-egg-nav.scrolled .easter-egg-nav__brand img {
    width: 40px;
    height: 40px;
}

.easter-egg-nav.scrolled .easter-egg-nav__link {
    padding: 0 var(--spacing-sm);
    font-size: 0.95rem;
}
.easter-egg-nav.scrolled .easter-egg-nav__link:hover::after {
    background: none;
}

.easter-egg-nav:hover {
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.nav-hidden {
    transform: translateX(-50%);
}

.easter-egg-nav__container {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-sm);
}

.easter-egg-nav__brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: 1.2rem;
    text-decoration: none;
}

.easter-egg-nav__brand img {
    width: 50px;
    height: 50px;
    transition: all var(--transition-normal);
}

.easter-egg-nav__brand span {
    background: linear-gradient(45deg, var(--google-blue), var(--google-red));
    -webkit-background-clip: text;
    color: transparent;
}
.easter-egg-nav__brand:hover img {
    transform: scale(1.1);
    filter: drop-shadow(0 0 10px rgba(0, 0, 0, 0.1));
}
.easter-egg-nav__brand:hover span {
    background: linear-gradient(45deg, var(--google-red), var(--google-blue));
    -webkit-background-clip: text;
    color: transparent;
}

.easter-egg-nav__menu-toggle {
    display: none;
}

.easter-egg-nav__links {
    display: flex;
    text-align: center;
    gap: var(--spacing-lg);
}

.easter-egg-nav__link {
    align-self: center;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
}

.easter-egg-nav__link > .easter-egg-nav__link__title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.easter-egg-nav__link img {
    width: 20px;
    height: 20px;
}

.easter-egg-nav__link > .easter-egg-nav__link__text {
    display: block;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 400;
}

.easter-egg-nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--google-blue);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.easter-egg-nav__link:hover::after {
    width: 100%;
}

.easter-egg-nav__link:hover {
    background-color: var(--hover-overlay);
}

.easter-egg-nav__theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 1.25rem;
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.easter-egg-nav__theme-toggle:hover {
    background-color: var(--hover-overlay);
    /*transform: rotate(360deg);*/
}

/* Enhanced Main Content */
.easter-egg-main {
    max-width: var(--container-width);
    margin: var(--spacing-lg) auto;
    margin-top: var(--nav-height);
    padding: 0 var(--spacing-sm);
    flex: 1;
}

.easter-egg-content {
    max-width: var(--content-width);
    margin: 0 auto;
}

/* Enhanced Sections */
.easter-egg-section {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-all);
}

.easter-egg-section:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

/* Enhanced Typography */
.easter-egg-title {
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 3rem);
    text-align: center;
    margin: var(--spacing-xl) 0;
    color: var(--text-primary);
    background: linear-gradient(45deg, var(--google-blue), var(--google-red));
    -webkit-background-clip: text;
    color: transparent;
    transition: all var(--transition-normal);
}

.easter-egg-section__title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
    transition: all var(--transition-normal);
}

.easter-egg-section__title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--google-blue), transparent);
    transform-origin: left;
    transform: scaleX(0.3);
    transition: transform var(--transition-normal);
}

.easter-egg-section:hover .easter-egg-section__title::after {
    transform: scaleX(1);
}

.easter-egg-section__subtitle {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    padding-left: var(--spacing-sm);
    border-left: 3px solid var(--google-green);
    transition: all var(--transition-normal);
}

.easter-egg-section__h4title {
    font-size: 1.1rem;
    padding-left: var(--spacing-md);
    color: var(--text-secondary);
    margin: var(--spacing-md) 0 var(--spacing-sm);
    position: relative;
    transition: all var(--transition-normal);
}

.easter-egg-section__h4title::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--google-green);
}

.easter-egg-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.easter-egg-section.key-facts-section {
    padding: 0;
    background-color: transparent;
    border: none;
    box-shadow: none;
}

.easter-egg-section.key-facts-section h2.easter-egg-section__title {
    display: none;
}

/* Enhanced Fun Facts Grid */
.key-facts-grid {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--spacing-xs);
    perspective: 1000px;
}

.key-facts-card {
    background-color: var(--bg-secondary);
    /*box-shadow: inset 0 0 1px rgba(0, 0, 0, 0.2);*/
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xs) var(--spacing-sm); /* 从 var(--spacing-lg) 改为 var(--spacing-sm) */
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    min-height: 100px; /* 添加最小高度限制 */
    display: flex; /* 添加弹性布局 */
    flex-direction: column;
}

.key-facts-card strong {
    margin-bottom: var(--spacing-xs);
}

.key-facts-card p {
    margin: auto 0; /* 使 p 元素在剩余空间中垂直居中 */
}

.key-facts-card:hover {
    transform: translateY(-8px) rotateX(10deg);
    box-shadow: var(--shadow-xl);
}

.key-facts-card--blue {
    border-left: 4px solid var(--google-blue);
}

.key-facts-card--red {
    border-left: 4px solid var(--google-red);
}

.key-facts-card--yellow {
    border-left: 4px solid var(--google-yellow);
}

.key-facts-card--green {
    border-left: 4px solid var(--google-green);
}

.key-facts-card__title {
    display: block;
    margin-bottom: var(--spacing-xs); /* 从 var(--spacing-sm) 改为 var(--spacing-xs) */
    font-weight: 600;
    font-size: 1.1rem; /* 从 1.2rem 改小到 1.1rem */
}

.key-facts-card--blue .key-facts-card__title {
    color: var(--google-blue);
}

.key-facts-card--red .key-facts-card__title {
    color: var(--google-red);
}

.key-facts-card--yellow .key-facts-card__title {
    color: var(--google-yellow);
}

.key-facts-card--green .key-facts-card__title {
    color: var(--google-green);
}

/* Enhanced Steps List */
.steps-list {
    list-style-position: inside;
    margin: var(--spacing-md) 0;
    counter-reset: step;
}

.steps-list__item {
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    counter-increment: step;
    display: flex;
    align-items: center;
}

.steps-list__item::before {
    content: counter(step);
    background-color: var(--google-blue);
    color: white;
    width: 1.5em;
    height: 1.5em;
    min-width: 20px;
    min-height: 20px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-sm);
    font-size: 0.9rem;
    font-weight: bold;
}

@media (max-width: 480px) {
    .steps-list__item {
        padding: var(--spacing-xs);
    }
    .steps-list__item::before {
        width: 1.3em;
        height: 1.3em;
        min-width: 18px;
        min-height: 18px;
        font-size: 0.8rem;
        margin-right: calc(var(--spacing-sm) * 0.75);
    }
}

.steps-list__item:hover {
    transform: translateX(8px);
    background-color: var(--bg-tertiary);
}

/* Enhanced FAQ Section */
.faq-container {
    display: grid;
    gap: var(--spacing-md);
}

.faq-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-item__question {
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item__question::after {
    content: '▼';
    font-size: 0.8rem;
    transition: transform var(--transition-normal);
}

details[open] .faq-item__question::after {
    transform: rotate(180deg);
}

.faq-item__answer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--card-border);
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-normal);
}

details[open] .faq-item__answer {
    transform: translateY(0);
    opacity: 1;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background-color: var(--google-green);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    border: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32' height='32' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' d='M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Enhanced Footer */
.easter-egg-footer {
    /* background-color: var(--bg-secondary); */
    background-color: rgb(from var(--bg-secondary) r g b / 0.8);
    border-top: 1px solid var(--card-border);
    padding: var(--spacing-xl) var(--spacing-sm);
    margin-top: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.easter-egg-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right,
    var(--google-blue),
    var(--google-red),
    var(--google-yellow),
    var(--google-green));
}

.easter-egg-footer__content {
    max-width: var(--container-width);
    margin: 0 auto;
    text-align: center;
    color: var(--text-secondary);
    position: relative;
}

/* Meta Info */
.easter-egg-hint {
    width: fit-content;
    text-align: center;
    color: var(--led-text);
    filter: drop-shadow(0 0 5px var(--led-text-shadow))  drop-shadow(0 0 10px var(--led-text))  drop-shadow(0 0 10px var(--led-text))  drop-shadow(0 0 10px var(--led-text-shadow));
    margin: 0 auto var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    --line-color: rgb(from var(--text-primary) r g b / 0.3);
    background-image: linear-gradient(
            45deg,
            transparent,
            transparent calc(50% - 0.5px),
            var(--line-color) calc(50% - 0.5px),
            var(--line-color) calc(50% + 0.5px),
            transparent calc(50% + 0.5px));
    background-size: 8px 8px;
}
[data-theme="dark"] .easter-egg-hint {
    filter: drop-shadow(0 0 3px var(--led-text-shadow)) drop-shadow(0 0 15px var(--led-text));
}
.easter-egg-hint::before,
.easter-egg-hint::after {
    content: '';
    height: 2px;
    width: 50px;
    background: linear-gradient(to right, transparent, var(--led-text));
}

.easter-egg-hint::after {
    background: linear-gradient(to left, transparent, var(--led-text));
}

.easter-egg-CTA__button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-md) auto;
    font-size: 18px;
    font-weight: 500;
    line-height: 27px;
    text-align: center;
    color: rgb(0, 0, 0);
    background-color: rgb(206, 255, 26);
    border: 2px solid black;
    border-radius: 4px;
    box-shadow: rgb(0, 0, 0) 4px 4px 0px 0px;
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-font-smoothing: antialiased;
    user-select: none;
}
.easter-egg-CTA__button svg {
    height: 1.5em;
    width: 1.5em;
    transform: rotate(90deg);
    margin-left: var(--spacing-xs);
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}
@media (hover: hover) and (pointer: fine) {
    .easter-egg-CTA__button:hover {
        box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;
        transform: matrix(1, 0, 0, 1, 2, 2);
    }
    .easter-egg-CTA__button:hover svg {
        transform: rotate(90deg) translateY(-10px);
    }
}

.easter-egg-CTA__button:active {
    box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;
    transform: matrix(1, 0, 0, 1, 4, 4);
    background-color: rgb(186, 230, 23);
}

.easter-egg-CTA__button:active svg {
    transform: rotate(90deg) translateY(-10px);
}

/* 深色主题样式 */
[data-theme="dark"] .easter-egg-CTA__button {
    color: white;
    background: linear-gradient(to right, #070e41, #263381);
    border: 2px solid rgb(76, 100, 255);
    box-shadow: rgb(76, 100, 255) 4px 4px 0px 0px;
}

@media (hover: hover) and (pointer: fine) {
    [data-theme="dark"] .easter-egg-CTA__button:hover {
        box-shadow: rgba(76, 100, 255, 0) 0px 0px 0px 0px;
        transform: matrix(1, 0, 0, 1, 2, 2);
    }
}

[data-theme="dark"] .easter-egg-CTA__button:active {
    box-shadow: rgba(76, 100, 255, 0) 0px 0px 0px 0px;
    transform: matrix(1, 0, 0, 1, 4, 4);
    background: linear-gradient(to right, #050a30, #1a2465);
}

/* Enhanced Responsive Design */
@media (max-width: 1024px) {
    :root {
        --container-width: 90%;
        --content-width: 90%;
    }
    
    .easter-egg-nav__container {
        padding: 0;
    }

    .easter-egg-nav__brand {
        gap: 0;
        font-size: 1rem;
    }

    .easter-egg-nav__links {
        gap: var(--spacing-xs);
    }

    .easter-egg-nav__link--faq {
        display: none;
    }

    .key-facts-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .key-facts-card:first-child {
        grid-column: 1 / -1; /* 从第一列开始到最后一列 */
    }
}

@media (max-width: 768px) {
    .easter-egg-nav.scrolled{
        padding: 0 0 calc(var(--spacing-xs) / 2) 0;
    }

    .easter-egg-nav.scrolled .easter-egg-nav__brand img {
        width: 40px;
        height: 40px;
    }

    .easter-egg-nav__links {
        display: none;
        position: fixed;
        top: calc(var(--nav-height) - var(--spacing-sm));
        left: 5%;
        right: 5%;
        width: 90%;
        background: var(--bg-secondary);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
        flex-direction: column;
        gap: var(--spacing-md);
        border: 1px solid var(--card-border);
        box-shadow: var(--shadow-xl);
        z-index: 999;
        max-height: calc(100vh - var(--nav-height) - var(--spacing-md));
        max-height: calc(100dvh - var(--nav-height) - var(--spacing-md));
        overflow-y: auto;
        opacity: 0;
        transform: translateY(-10px);
        transition: var(--transition-all);
    }

    .easter-egg-nav__links.active {
        display: flex;
        opacity: 1;
        transform: translateY(0);
    }

    .easter-egg-nav__link {
        width: 100%;
        text-align: left;
        padding: var(--spacing-sm);
    }

    .easter-egg-nav__link > .easter-egg-nav__link__title {
        justify-content: flex-start;
    }

    .easter-egg-nav__menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 30px;
        height: 20px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }

    .easter-egg-nav__menu-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background-color: var(--text-secondary);
        transition: all var(--transition-normal);
    }

    .easter-egg-nav__menu-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .easter-egg-nav__menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .easter-egg-nav__menu-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    .easter-egg-nav__theme-toggle {
        margin-left: auto;
        margin-right: var(--spacing-md);
    }

    .easter-egg-section {
        padding: var(--spacing-lg);
    }

    .easter-egg-section__title {
        font-size: 1.5rem;
    }
}

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

    .easter-egg-section {
        padding: var(--spacing-md);
    }

    .back-to-top {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }
}

/* 添加遮罩层样式 */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition-normal);
    touch-action: none;
    overscroll-behavior: contain;
}

.nav-overlay.active {
    display: block;
    opacity: 1;
}

/* 当导航菜单打开时禁止 body 滚动 */
body.nav-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

.easter-egg-nav__link.dropdown {
    position: relative;
    cursor: pointer;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--card-bg);
    min-width: 250px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--card-border);
    z-index: 1000;
}

.dropdown-content h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--card-border);
}

.dropdown-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dropdown-content li {
    margin: var(--spacing-xs) 0;
}

.dropdown-content a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.dropdown-content a:hover {
    color: var(--text-primary);
    background-color: var(--hover-overlay);
}

/* Desktop: Show dropdown on hover */
@media (min-width: 769px) {
    .easter-egg-nav__link.dropdown:hover .dropdown-content {
        display: block;
        animation: fadeIn var(--transition-normal);
    }
}

/* Mobile: Show dropdown on click */
@media (max-width: 768px) {
    .dropdown-content {
        position: static;
        margin: var(--spacing-sm) 0;
        width: 100%;
        box-shadow: none;
        border-left: 2px solid var(--google-blue);
    }

    .easter-egg-nav__link.dropdown.active .dropdown-content {
        display: block;
        animation: slideDown var(--transition-normal);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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