/* Header 共用樣式 */
.site-header {
    background: rgba(253, 246, 240, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: transform 0.6s ease, 
                opacity 0.6s ease, 
                background 0.3s ease;
    transform: translateY(0);
    opacity: 1;
}

/* 向下滾動時隱藏 */
.site-header.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

/* 向上滾動或滾動一定距離後顯示並加強樣式 */
.site-header.scrolled {
    background: rgba(253, 246, 240, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(0);
    opacity: 1;
}

/* Logo 樣式 */
.header-logo {
    width: 40px;
    height: 40px;
    transition: transform 0.3s ease;
}

.header-logo:hover {
    transform: scale(1.1);
}

/* 導航選單樣式 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: #4a4a4a;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #f09877;
    background: rgba(240, 152, 119, 0.1);
}

.nav-link.active {
    color: #f09877;
    background: rgba(240, 152, 119, 0.15);
}

/* 下載按鈕樣式 */
.download-btn {
    background: linear-gradient(45deg, #f09877, #e87b8d);
    color: white;
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(240, 152, 119, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(240, 152, 119, 0.4);
}

/* Demo 按鈕樣式 - 顯著但獨特 */
.demo-btn {
    background: linear-gradient(45deg, #4f46e5, #7c3aed);
    color: white;
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(79, 70, 229, 0.3);
    position: relative;
    overflow: hidden;
}

.demo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(79, 70, 229, 0.4);
}

.demo-btn.active {
    background: linear-gradient(45deg, #3730a3, #6b21a8);
    box-shadow: 0 3px 15px rgba(55, 48, 163, 0.4);
}

/* 手機版選單按鈕 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #4a4a4a;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.3s ease;
}

.mobile-menu-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* 手機版選單 */
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 1rem;
}

.mobile-menu.active {
    display: block;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-nav .nav-link {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    text-align: center;
}

.mobile-nav .download-btn {
    margin-top: 0.5rem;
    text-align: center;
    padding: 0.75rem 1.5rem;
}

.mobile-nav .demo-btn {
    margin-top: 0.5rem;
    text-align: center;
    padding: 0.75rem 1.5rem;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
}

/* 淡入動畫 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-header {
    animation: fadeInDown 0.6s ease-out;
}