/* 4. 导航栏样式 (Header) */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(6, 7, 19, 0.6);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.site-header.scrolled {
    background: rgba(6, 7, 19, 0.95);
    padding: 8px 0;
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand-logo {
    background: #ffffff;
    padding: 6px 16px;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    height: 44px;
    transition: var(--transition-smooth);
}

.brand-logo:hover {
    transform: translateY(-1px) scale(1.03);
    box-shadow: 0 6px 16px rgba(226, 30, 92, 0.25);
}

.logo-image {
    height: 30px;
    width: auto;
    display: block;
}

.nav-menu ul {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted-light);
    position: relative;
    padding: 8px 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text-white);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-smooth);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.contact-btn {
    background: var(--accent-gradient);
    color: var(--color-text-white) !important;
    padding: 8px 18px !important;
    border-radius: 4px;
    font-weight: 600;
}

.contact-btn:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.contact-btn::after {
    display: none;
}

/* 移动端菜单按钮 */
.hamburger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-menu .bar {
    display: block;
    width: 24px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--color-text-white);
    transition: var(--transition-smooth);
    border-radius: 2px;
}

/* 12. 页脚 (Footer) */
.site-footer {
    background-color: #040510;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 80px;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 64px;
    padding-bottom: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-brand-logo-wrap {
    background: #ffffff;
    padding: 6px 16px;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: flex-start;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    height: 40px;
}

.footer-logo-img {
    height: 26px;
    width: auto;
    display: block;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted-light);
    line-height: 1.7;
}

.footer-links h4, .footer-contacts h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted-light);
}

.footer-links a:hover {
    color: var(--primary-pink);
    padding-left: 4px;
}

.footer-contacts p {
    font-size: 0.9rem;
    color: var(--color-text-muted-light);
    margin-bottom: 12px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding: 32px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-muted-dark);
}

/* ==========================================================================
   13. 动画关键帧 (Animations)
   ========================================================================== */
@keyframes float1 {
    0%, 100% { transform: translateY(0) rotate(-6deg); }
    50% { transform: translateY(-12px) rotate(-8deg); }
}

@keyframes float2 {
    0%, 100% { transform: translateY(0) rotate(4deg); }
    50% { transform: translateY(-12px) rotate(6deg); }
}

@keyframes rotateSlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes scalePulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.05); }
}

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

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}