.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 50px 0;
    position: relative;
}

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

.section-bg-dots {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(0, 82, 255, 0.08);
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-label-red { color: var(--huawei-red); background: rgba(199,0,11,0.08); }
.section-label-green { color: var(--health-green); background: rgba(0,168,107,0.08); }

.section-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-desc {
    font-size: 13px;
    color: var(--muted-fg);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: var(--radius);
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--accent-fg);
    box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
    background: var(--accent-2);
    box-shadow: var(--shadow-accent-lg);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--fg);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn-block { display: flex; justify-content: center; width: 100%; }
.btn-arrow { transition: transform 0.2s ease; }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ========== 统一顶部导航 ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(247, 249, 252, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.nav.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 18px;
    text-decoration: none;
    color: var(--fg);
}

.nav-logo .logo-accent { color: var(--huawei-red); }

.logo-icon { color: var(--accent); font-size: 20px; }

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    font-size: 13px;
    font-weight: 500;
    color: var(--muted-fg);
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-links a:hover { color: var(--fg); }
.nav-links a.active { color: var(--accent); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--fg);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-dark);
    color: var(--muted-fg-light);
    padding: 48px 0 24px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 32px;
}

.footer-brand .footer-logo {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--fg-light);
    margin-bottom: 8px;
    display: block;
}

.footer-brand .footer-logo .logo-accent { color: var(--huawei-red); }
.footer-brand p { font-size: 13px; color: var(--muted-fg-light); line-height: 1.6; }

.footer-col h5 {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--fg-light);
    margin-bottom: 12px;
}

.footer-col a {
    display: block;
    font-size: 12px;
    color: var(--muted-fg-light);
    text-decoration: none;
    margin-bottom: 8px;
    transition: color 0.2s;
}

.footer-col a:hover { color: var(--accent-2); }

.footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p { font-size: 12px; color: var(--muted-fg-light); }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg);
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .section-title { font-size: 22px; }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .footer-container { flex-direction: column; text-align: center; }
}

@media (max-width: 600px) {
    .footer-top { grid-template-columns: 1fr; }
}