/* 桌面端特定样式 */
.book-container {
    width: min(1000px, 92vw);
    height: 500px;
    perspective: 1800px;
    margin: 0 auto;
}

.book {
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transform: rotateY(0deg) translateZ(0);
    flex-direction: row;
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.3),
        0 0 40px rgba(64, 192, 255, 0.25),
        0 0 80px rgba(56, 189, 248, 0.15);
    animation: openBook 0.8s ease-out forwards;
    will-change: transform;
    transform-origin: center;
    backface-visibility: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

@keyframes openBook {
    0% {
        transform: rotateY(-70deg) translateZ(0);
        opacity: 0;
    }
    100% {
        transform: rotateY(0deg) translateZ(0);
        opacity: 1;
    }
}

.book:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 15px 30px rgba(0, 0, 0, 0.3),
        0 0 50px rgba(64, 192, 255, 0.3),
        0 0 100px rgba(56, 189, 248, 0.2);
    transition: all 0.3s ease-out;
}

.book::after {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(
        125deg,
        rgba(56, 189, 248, 0.1),
        rgba(59, 130, 246, 0.1),
        rgba(99, 102, 241, 0.1)
    );
    border-radius: 24px;
    opacity: 0.3;
    pointer-events: none;
    z-index: -1;
}

.page {
    flex: 1;
    padding: 40px;
}

.page.left {
    border-right: 2px solid rgba(64, 192, 255, 0.3);
    animation: openLeft 0.6s ease-out forwards;
    opacity: 0;
    will-change: transform;
    backface-visibility: hidden;
    transform-origin: left center;
    transform: translate3d(0,0,0);
}

.page.right {
    animation: openRight 0.6s ease-out forwards 0.1s;
    opacity: 0;
    will-change: transform;
    backface-visibility: hidden;
    transform-origin: right center;
    transform: translate3d(0,0,0);
}

@keyframes openLeft {
    0% {
        transform: rotateY(-30deg);
        opacity: 0;
    }
    100% {
        transform: rotateY(0deg);
        opacity: 1;
    }
}

@keyframes openRight {
    0% {
        transform: rotateY(30deg);
        opacity: 0;
    }
    100% {
        transform: rotateY(0);
        opacity: 1;
    }
}

.page.left::after {
    content: '';
    position: absolute;
    right: -1px;
    top: 15%;
    height: 70%;
    width: 2px;
    background: linear-gradient(
        to bottom,
        rgba(64, 192, 255, 0),
        rgba(64, 192, 255, 0.5) 20%,
        rgba(100, 255, 218, 0.5) 50%,
        rgba(64, 192, 255, 0.5) 80%,
        rgba(64, 192, 255, 0)
    );
    box-shadow: 0 0 15px rgba(64, 192, 255, 0.5);
}

.welcome-text {
    font-size: 2.5em;
    margin-bottom: 30px;
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.8s forwards;
    opacity: 0;
    will-change: transform, opacity;
}

.book h2 {
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 1s forwards;
    opacity: 0;
    will-change: transform, opacity;
}

.button-container {
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 1.2s forwards;
    opacity: 0;
    will-change: transform, opacity;
}

@keyframes fadeIn {
    0% {
        transform: translateY(20px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

.button-container {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-top: 20px;
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 1.2s forwards;
    opacity: 0;
    will-change: transform, opacity;
}

.button {
    padding: 12px 40px;
    font-size: 1.2em;
    min-width: 160px;
    text-decoration: none;
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.1);
    border: 2px solid #38bdf8;
    border-radius: 25px;
    transition: all 0.3s ease-out;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.2);
}

.button:hover {
    color: #e2e8f0;
    transform: translateY(-3px);
    background: rgba(56, 189, 248, 0.8);
    box-shadow: 
        0 8px 25px rgba(56, 189, 248, 0.3),
        0 0 40px rgba(56, 189, 248, 0.2);
}

.button:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.2);
}

.footer-section {
    height: 120px;
}

.footer-item {
    padding: 12px 25px;
    font-size: 0.85em;
}

.footer-item:hover {
    transform: translateY(-2px);
    border-color: rgba(56, 189, 248, 0.4);
    background: rgba(15, 23, 42, 0.9);
}

.footer-item:hover a {
    color: #60a5fa;
}

.footer-item:hover .beian-icon {
    opacity: 1;
}

@keyframes float {
    0%, 100% { transform: rotateX(10deg) translateY(0); }
    50% { transform: rotateX(10deg) translateY(-20px); }
}