:root {
    --text-color: #ffffff;
    --accent-color: #00d2ff;
    --glass-border: rgba(255, 255, 255, 0.2);
    --btn-bg: rgba(255, 255, 255, 0.1);
}

body, html {
    margin: 0; padding: 0; min-height: 100%;
    font-family: 'Inter', 'PingFang SC', sans-serif;
    background: #0a0a0b; overflow-x: hidden; color: var(--text-color);
}

/* 导航栏 */
.glass-nav {
    position: fixed; top: 0; width: 100%; z-index: 1000;
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 2rem; box-sizing: border-box;
    background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-btn {
    color: white; text-decoration: none; margin-left: 10px;
    font-size: 0.85rem; font-weight: 600; padding: 8px 18px; border-radius: 50px;
    background: var(--btn-bg); border: 1px solid var(--glass-border);
    transition: all 0.3s ease; display: inline-block;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2); border-color: var(--accent-color);
    transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0, 210, 255, 0.2);
}

/* Hero 区域：自适应垂直居中布局 */
.hero-section {
    position: relative;
    width: 100%;
    height: 100vh; /* 撑满屏幕高度 */
    display: flex;
    flex-direction: column;
    justify-content: center; /* 水平居中 */
    align-items: center;     /* 垂直居中 */
    padding: 0 20px;
    box-sizing: border-box;
    overflow: hidden;
}

.hero-content-pure {
    text-align: center;
    z-index: 1;
    width: 100%;
    max-width: 800px;
    /* 核心修改：向上平移 12%，实现“居中偏上”，为底部留出视觉空间 */
    transform: translateY(-12%); 
    will-change: transform, opacity;
}

.hero-content-pure h1 { 
    font-size: clamp(2rem, 8vw, 3.5rem); /* 自适应字体大小 */
    font-weight: 800; 
    margin: 0 auto 1.5rem;
    line-height: 1.2;
    white-space: normal;
    word-wrap: break-word;
}

.hero-content-pure p { 
    font-size: clamp(0.9rem, 4vw, 1.2rem);
    opacity: 0.8; 
    margin: 0 auto 2.5rem;
    max-width: 600px;
    line-height: 1.6;
    white-space: normal;
    word-wrap: break-word;
}

/* 按钮容器确保按钮在 text-align 下居中 */
.btn-container {
    display: flex;
    justify-content: center;
    width: 100%;
}

.btn-visit {
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    padding: 14px 40px;
    border-radius: 100px;
    font-weight: 700;
    transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: inline-block;
    box-shadow: 0 10px 20px rgba(0, 210, 255, 0.3);
}

/* 动画状态控制 */
.hero-content-pure h1, 
.hero-content-pure p, 
.hero-content-pure .btn-container {
    transition: all 0.7s cubic-bezier(0.23, 1, 0.32, 1);
    opacity: 0;
    transform: translateY(30px);
}

.hero-content-pure.active h1, 
.hero-content-pure.active p, 
.hero-content-pure.active .btn-container {
    opacity: 1;
    transform: translateY(0);
}

/* 背景图 */
.hero-bg {
    position: absolute; inset: 0; 
    background-size: cover; background-position: center;
    transition: opacity 1s ease; filter: brightness(0.35); z-index: -1;
}

/* 底部 Swiper 修复 */
.bottom-nav-container {
    position: absolute; bottom: 30px; width: 100%; height: 180px; z-index: 10;
}

.swiper { 
    width: 95%; height: 100%; padding: 25px 0 !important; overflow: visible !important;
}

.nav-card {
    background: rgba(255,255,255,0.05); border-radius: 16px; overflow: hidden;
    cursor: pointer; transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent; height: 120px !important;
}

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

.grayscale { filter: grayscale(100%); opacity: 0.5; }

.swiper-slide-active.nav-card {
    border-color: var(--accent-color);
    animation: pulse 2.5s infinite ease-in-out;
    filter: none; opacity: 1;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.card-info {
    position: absolute; bottom: 0; width: 100%; padding: 8px;
    background: linear-gradient(transparent, rgba(0,0,0,0.85)); text-align: center;
}
.card-info h3 { margin: 0; font-size: 12px; }

@media (max-width: 767px) {
    .hero-section { padding-top: 60px; }
    .hero-content-pure { transform: translateY(-15%); } /* 移动端再往上提一点 */
}