/* ============================================
   新版导航 — 下拉菜单与响应式
   ============================================ */
.nav-menu { gap: 0; }
.nav-link { padding: 8px 13px; }
.nav-item { position: relative; }
.has-dropdown > .nav-link { position: relative; padding-right: 26px; }
.has-dropdown > .nav-link::before {
    content: '';
    position: absolute;
    top: 55%;
    right: 10px;
    width: 0; height: 0;
    border: 4px solid transparent;
    border-top-color: rgba(255,255,255,0.45);
    transform: translateY(-50%);
    transition: border-top-color 0.2s;
}
.has-dropdown:hover > .nav-link::before { border-top-color: var(--text-white); }
.nav-dropdown {
    position: absolute;
    top: 100%; left: 0;
    min-width: 190px;
    background: rgba(18,21,31,0.97);
    border: 1px solid rgba(255,255,255,0.12);
    border-top: 2px solid var(--accent);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 8px 0;
    opacity: 0; visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
    z-index: 1001;
    box-shadow: 0 16px 40px rgba(0,0,0,0.35);
}
.has-dropdown:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(2px); }
.nav-dropdown a {
    display: block;
    padding: 10px 22px;
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    white-space: nowrap;
    transition: all 0.2s;
}
.nav-dropdown a:hover { color: var(--text-white); background: rgba(37,118,181,0.25); }

@media (max-width: 900px) {
    .nav-item { width: 100%; }
    .has-dropdown > .nav-link { padding-right: 12px; }
    .has-dropdown > .nav-link::before { display: none; }
    .nav-dropdown {
        position: static;
        opacity: 1; visibility: visible; transform: none;
        background: transparent;
        border: none;
        backdrop-filter: none; -webkit-backdrop-filter: none;
        box-shadow: none;
        padding: 0;
    }
    .nav-dropdown a {
        padding: 12px 0 12px 28px;
        font-size: 15px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-dropdown a:hover { background: transparent; color: var(--text-white); }
}

/* ============================================
   页脚五列布局
   ============================================ */
.footer-top { grid-template-columns: 1.7fr 1fr 1fr 0.8fr 1fr; }
@media (max-width: 1200px) { .footer-top { grid-template-columns: 1fr 1fr 1fr; } }
@media (max-width: 900px) { .footer-top { grid-template-columns: 1fr 1fr; } }

/* ============================================
   通用扩展组件
   ============================================ */
.hex-icon.big { width: 48px; height: 48px; }
a.product-card { display: block; }
a.angular-card { display: block; }
.section-gray .arch-grid { border-color: var(--border); }
.section-gray .arch-layer { border-right-color: var(--border); }
.section-gray .arch-layer:hover { background: rgba(37,118,181,0.04); }
.section-gray .arch-layer h4 { color: var(--text-primary); }
.section-gray .arch-layer p { color: var(--text-secondary); }
.section-gray .arch-layer .layer-tag { border-color: var(--border); color: var(--text-secondary); }

/* 客户案例筛选与卡片 */
.case-filter { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 48px; }
.case-tab {
    padding: 10px 26px;
    font-family: var(--font-cn);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--surface);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}
.case-tab:hover { border-color: var(--primary); color: var(--primary); }
.case-tab.active { background: var(--primary); border-color: var(--primary); color: var(--text-white); }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 28px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    display: flex;
    flex-direction: column;
}
.case-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px; height: 0;
    background: var(--primary);
    transition: height 0.35s;
}
.case-card[data-color="accent"]::before { background: var(--accent); }
.case-card[data-color="green"]::before { background: var(--green); }
.case-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.case-card:hover::before { height: 100%; }
.case-card .case-cat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-en);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--primary);
    margin-bottom: 14px;
    text-transform: uppercase;
}
.case-card[data-color="accent"] .case-cat { color: var(--accent); }
.case-card[data-color="green"] .case-cat { color: var(--green); }
.case-card h4 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; line-height: 1.5; }
.case-card .case-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.case-card .case-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.case-card .case-tag {
    font-size: 11px;
    padding: 3px 10px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    background: var(--light-bg);
}
.case-card.hide { display: none; }
@media (max-width: 1200px) { .case-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 900px) { .case-grid { grid-template-columns: 1fr; } }

/* 代理流程步骤 */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 32px 28px;
    position: relative;
    transition: all 0.3s;
}
.step-card:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); transform: translateY(-4px); }
.step-card .step-num {
    font-family: var(--font-en);
    font-size: 36px;
    font-weight: 800;
    line-height: 1;
    color: rgba(37,118,181,0.18);
    margin-bottom: 16px;
}
.step-card.accent .step-num { color: rgba(227,70,73,0.20); }
.step-card.green .step-num { color: rgba(62,165,117,0.22); }
.step-card h5 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.step-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
@media (max-width: 1200px) { .steps-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 900px) { .steps-grid { grid-template-columns: 1fr; } }

/* 双中台大卡片 */
.middleware-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.middleware-card {
    background: var(--dark-bg-2);
    border: 1px solid var(--border-dark);
    padding: 48px 40px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}
.middleware-card::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(circle at 20% 20%, rgba(37,118,181,0.12), transparent 55%),
                radial-gradient(circle at 80% 80%, rgba(227,70,73,0.08), transparent 55%);
}
.middleware-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.middleware-card > * { position: relative; z-index: 1; }
.middleware-card .mw-tag { font-family: var(--font-en); font-size: 12px; font-weight: 700; letter-spacing: 2px; color: var(--primary-light); margin-bottom: 14px; }
.middleware-card .mw-tag.accent { color: var(--accent); }
.middleware-card h3 { font-size: 26px; font-weight: 900; color: var(--text-white); margin-bottom: 16px; }
.middleware-card .mw-desc { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.8; margin-bottom: 24px; }
.middleware-card .mw-list { display: flex; flex-direction: column; gap: 10px; }
.middleware-card .mw-list li {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    display: flex; align-items: center; gap: 10px;
}
.middleware-card .mw-list li::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent);
    flex-shrink: 0;
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
@media (max-width: 900px) { .middleware-grid { grid-template-columns: 1fr; } }

/* 相关产品/方案芯片 */
.sol-links { display: flex; flex-wrap: wrap; gap: 10px; }
.sol-link-chip {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 18px;
    border: 1px solid var(--border);
    font-size: 13px; font-weight: 600;
    color: var(--text-secondary);
    background: var(--surface);
    transition: all 0.2s;
}
.sol-link-chip:hover { border-color: var(--primary); color: var(--primary); }