/* 通用布局 */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    position: relative;
    padding: var(--spacing-2xl) 0;
}

.section-dark {
    background-color: var(--color-bg-secondary);
}

.section-darker {
    background-color: var(--color-bg-primary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--color-accent-red);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: currentColor;
    transition: width var(--transition-base);
}

.btn:hover::before {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-red) 0%, var(--color-accent-red-dark) 100%);
    color: white;
    box-shadow: var(--shadow-glow-red);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(229, 57, 53, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    border-color: var(--color-accent-red);
    color: var(--color-accent-red);
    background: rgba(229, 57, 53, 0.08);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 0.9rem;
}

.btn-xl {
    padding: 1.25rem 2.5rem;
    font-size: 1rem;
}

.btn-icon {
    width: 1.2em;
    height: 1.2em;
}

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-red), var(--color-accent-orange));
    z-index: 10000;
    transition: width 0.1s linear;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-base);
    padding: 1rem 0;
}

.navbar.scrolled {
    background: rgba(10, 10, 12, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
}

.navbar-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-logo {
    display: flex;
    align-items: center;
}

.navbar-logo img {
    height: 40px;
    width: auto;
    filter: drop-shadow(0 0 8px rgba(229, 57, 53, 0.3));
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    list-style: none;
}

.navbar-link {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

.navbar-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-red);
    transition: width var(--transition-fast);
}

.navbar-link:hover,
.navbar-link.active {
    color: var(--color-text-primary);
}

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

.navbar-cta {
    margin-left: var(--spacing-sm);
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.navbar-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.navbar-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* 滚动显现动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-active {
    opacity: 1;
    transform: translateY(0);
}

/* 页脚 */
.footer {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    height: 48px;
    width: auto;
    margin-bottom: var(--spacing-sm);
}

.footer-slogan {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--color-accent-red);
}

.footer-divider {
    height: 1px;
    background: var(--color-divider);
    margin-bottom: var(--spacing-lg);
}

.footer-bottom {
    text-align: center;
}

.footer-health {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

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