/* ====================================
 * 导航与全局布局
 * ==================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: linear-gradient(120deg, rgba(10, 22, 40, 0.92), rgba(6, 18, 35, 0.92));
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(232, 233, 234, 0.08);
    box-shadow: 0 18px 40px rgba(4, 12, 22, 0.28);
}

.header .container {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

.header::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    background: linear-gradient(90deg, rgba(0, 200, 150, 0.45), rgba(226, 232, 240, 0.12) 45%, rgba(0, 180, 180, 0.45));
    opacity: 0.85;
    pointer-events: none;
}

.header--compact {
    background: rgba(7, 16, 30, 0.98);
    box-shadow: 0 20px 45px rgba(2, 10, 20, 0.55);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    height: 78px;
    flex-wrap: nowrap;
}

.logo {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    letter-spacing: 0;
    white-space: nowrap;
    max-width: 100%;
    flex-shrink: 0;
}

.logo__text {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.logo__name {
    font-size: 1.05rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    letter-spacing: 0.02em;
    line-height: 1.3;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-xs);
    position: relative;
    padding: 0;
    flex-wrap: nowrap;
}

.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    flex: 0 0 auto;
}

.nav-item::after {
    display: none;
}

.nav-item:last-child::after {
    display: none;
}

.nav-item--cta {
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-lg);
    border-left: 1px solid rgba(148, 163, 184, 0.18);
}

.nav-link {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding: 12px 18px;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    position: relative;
    border-radius: var(--border-radius-lg);
    transition: color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(145deg, rgba(14, 80, 115, 0.16), rgba(0, 200, 150, 0.08));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 10px;
    height: 2px;
    border-radius: var(--border-radius-full);
    background: linear-gradient(90deg, rgba(0, 200, 150, 0), rgba(0, 200, 150, 0.7), rgba(0, 200, 150, 0));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}

.nav-link__label {
    font-size: 0.94rem;
    color: inherit;
    white-space: nowrap;
}

.nav-link__sub {
    display: none !important;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(12, 56, 92, 0.35);
    box-shadow: 0 16px 32px rgba(3, 25, 46, 0.32);
}

.nav-link:hover::before,
.nav-link.active::before {
    opacity: 1;
}

.nav-link:hover::after,
.nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}

/* 二级导航 (Dropdown) */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 16px);
    left: 0;
    min-width: 240px;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    background: rgba(15, 25, 44, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(232, 233, 234, 0.1);
    box-shadow: var(--shadow-soft);
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.dropdown-item a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    transition: background 0.3s ease, color 0.3s ease;
}

.dropdown-item a::after {
    content: '↗';
    font-size: 0.75rem;
    opacity: 0.4;
}

.dropdown-item a:hover {
    background: rgba(0, 200, 150, 0.12);
    color: var(--color-white);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-actions__cta {
    min-width: 160px;
    text-align: center;
}

.nav-hotline {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: flex-start;
    text-align: left;
}

.nav-hotline__label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: rgba(148, 163, 184, 0.75);
}

.nav-hotline__value {
    font-size: 1.05rem;
    font-weight: var(--font-weight-semi);
    letter-spacing: 0.08em;
    color: var(--color-white);
}

.menu-toggle {
    margin-left: auto;
}

/* 移动端菜单 */
.menu-toggle {
    display: none;
    font-size: 1.8rem;
    color: var(--color-text-primary);
    cursor: pointer;
    }

/* 页脚 */
.footer {
    background: linear-gradient(160deg, rgba(10, 24, 40, 0.95), rgba(6, 14, 28, 0.98));
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(0, 200, 150, 0.18), transparent 48%);
    opacity: 0.8;
}

.footer .container {
    position: relative;
    z-index: 2;
}

.footer h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.footer p,
.footer a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer a:hover {
    color: var(--color-white);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.footer-bottom {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(232, 233, 234, 0.1);
    text-align: center;
    color: rgba(226, 232, 240, 0.6);
    font-size: 0.85rem;
}

.footer-industrial {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.footer-industrial span {
    display: inline-block;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid rgba(232, 233, 234, 0.2);
    background: rgba(11, 28, 45, 0.75);
    position: relative;
}

.footer-industrial span::before,
.footer-industrial span::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 2px;
    background: rgba(232, 233, 234, 0.4);
}

.footer-industrial span::before { left: -14px; }
.footer-industrial span::after { right: -14px; }

.footer__cta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    background: linear-gradient(150deg, rgba(10, 30, 48, 0.65), rgba(8, 16, 32, 0.92));
    border: 1px solid rgba(232, 233, 234, 0.08);
    box-shadow: var(--shadow-soft);
}

.footer__eyebrow {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer__cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.footer__cta-actions .btn {
    min-width: 160px;
    text-align: center;
}

.footer__col {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links li span {
    color: var(--color-text-secondary);
}

/* 响应式处理 */
@media (max-width: 1080px) {
    .header .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }

    .logo {
        max-width: 240px;
    }

    .logo__name {
        font-size: 0.95rem;
    }

    .nav-menu {
        position: fixed;
        top: 78px;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-lg);
        background: rgba(10, 18, 35, 0.98);
        width: min(420px, 90vw);
        transform: translateX(100%);
        transition: transform 0.4s ease;
        backdrop-filter: blur(16px);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-item::after {
        display: none;
    }

    .nav-link {
        width: 100%;
        padding: 16px 20px;
        font-size: 1.1rem;
        gap: 0;
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
    }

    .dropdown-menu {
        position: relative;
        inset: 0;
        margin-top: var(--spacing-xs);
        width: 100%;
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
        backdrop-filter: none;
        background: rgba(17, 35, 57, 0.35);
        border: 1px solid rgba(232, 233, 234, 0.05);
        display: none;
    }

    .nav-item.open > .dropdown-menu {
        display: block;
    }

    .dropdown-item a::after {
        content: '';
    }

    .menu-toggle {
        display: block;
    }

    .nav-item--cta {
        width: 100%;
        margin-left: 0;
        padding: var(--spacing-md) 0 0;
        border-top: 1px solid rgba(232, 233, 234, 0.08);
        border-left: none;
    }

    .nav-actions {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
        gap: var(--spacing-sm);
    }

    .nav-actions__cta {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer__cta-actions {
        justify-content: flex-start;
    }
}

@media (max-width: 640px) {
    .navbar {
        height: 72px;
    }

    .header .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }

    .logo__name {
        font-size: 0.9rem;
    }

    .footer-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .footer__cta {
        grid-template-columns: minmax(0, 1fr);
        text-align: left;
    }
}