:root {
    --primary-cream: #FEF9C4;
    --primary-sky: #DDEBFA;
    --accent-yellow: #FFE066;
    --neutral-white: #FFFFFF;
    --neutral-light-gray: #F5F5F5;
    --neutral-dark-gray: #333333;
    --border-sky: #B4D4F7;
}

/* 基础按钮 */
.btn {
    display:inline-flex;
    gap:0.5rem;
    align-items:center;
    padding:0.6rem 1rem;
    border-radius:10px;
    text-decoration:none;
    font-weight:700;
    cursor:pointer;
}
.btn-primary {
    background: linear-gradient(90deg,#2575fc,#6a11cb);
    color:#fff;
}

/* 仿首页按钮样式（用于与首页保持一致的视觉效果） */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-sky);
    border-radius: 12px;
    background: var(--primary-cream);
    color: var(--neutral-dark-gray);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--primary-sky), transparent);
    transition: left 0.5s ease;
}
.btn:hover::before { left: 100%; }
.btn:hover {
    background: var(--primary-sky);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(221, 235, 250, 0.4);
}
.btn-primary:hover {
    background: var(--accent-yellow);
    border-color: var(--accent-yellow);
}

/* 合规声明样式（与首页一致） */
.compliance-notice {
    background: var(--primary-sky);
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 2rem;
    text-align: center;
}
.compliance-notice h4 {
    color: var(--neutral-dark-gray);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.compliance-notice p {
    color: var(--neutral-dark-gray);
    font-size: 0.875rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

/* 加载遮罩与书本动效 */
/* loading overlay removed - replaced by inline non-blocking behavior */

/* 进度条 */
.progress-container { position: fixed; top: 0; left: 0; width: 100%; height: 4px; background: var(--primary-cream); z-index: 1001; }
.progress-bar { height: 100%; background: var(--primary-sky); width: 0%; transition: width 0.3s ease; position: relative; }

/* 回到顶部 */
.scroll-to-top { position: fixed; bottom: 2rem; right: 2rem; width: 50px; height:50px; background: var(--accent-yellow); border:2px solid var(--primary-sky); border-radius:50%; display:flex; align-items:center; justify-content:center; cursor:pointer; opacity:0; visibility:hidden; transition: all 0.3s ease; z-index:1000; }
.scroll-to-top.visible { opacity:1; visibility:visible; }
.scroll-to-top:hover { transform: scale(1.1); background: var(--primary-sky); }

/* 动画 */
.fade-in-up { opacity:0; transform: translateY(30px); transition: all 0.6s ease; }
.fade-in-up.visible { opacity:1; transform: translateY(0); }

/* 导航与页脚简化样式（用于非首页页面共享） */
.navbar { background: transparent; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); transition: all 0.3s ease; position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: 80px; padding: 0; }
.navbar.scrolled { background: transparent; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08); }
.navbar .container { display:flex; align-items:center; justify-content:space-between; max-width:1200px; margin:0 auto; padding:0 1rem; height: 80px; }
.nav-link { position: relative; color:var(--neutral-dark-gray); text-decoration:none; padding:0.4rem 0.8rem; border-radius:8px; transition: all 0.3s ease; }
.nav-link:hover { background:var(--primary-sky); transform: translateY(-1px); }
.nav-link::after { content: ''; position: absolute; bottom: -2px; left: 50%; width: 0; height: 2px; background: var(--border-sky); transition: all 0.3s ease; transform: translateX(-50%); }
.nav-link:hover::after { width: 80%; }
.footer { background: var(--neutral-white); border-top: 2px solid var(--primary-sky); padding:3rem 2rem 2rem; margin-top:2rem; }
.footer-content { max-width:1200px; margin:0 auto; display:grid; grid-template-columns: repeat(4, 1fr); gap:1.5rem; }
.footer-section h3 { font-size:1rem; margin-bottom:0.6rem; }
.footer-links { list-style:none; padding:0; margin:0; }
.footer-links a { color:var(--neutral-dark-gray); text-decoration:none; display:block; margin-bottom:0.5rem; }
.compliance-link { color:var(--neutral-dark-gray); text-decoration:none; font-weight:600; transition:color 0.2s ease; }
.compliance-link:hover { color:var(--border-sky); }

@media (max-width:800px) {
    .footer-content { grid-template-columns: 1fr 1fr; }
    .container { padding:16px; }
}


/* 帮助页专用：保持与首页一致的页脚样式 */

/* Ensure any leftover loading overlays are hidden */
.loading-overlay, .loading-book, .loading-logo { display: none !important; visibility: hidden !important; opacity: 0 !important; pointer-events: none !important; }