/* ===== CORE ADVANTAGES 核心优势 ===== */
.core-adv { padding: 80px 0 60px; background: #fff; overflow: visible; }
.core-adv-title-container { position: relative; text-align: center; margin-bottom: 90px; height: 45px; }
.core-adv-label { font-family: Source Han Sans CN, sans-serif; font-weight: 400; font-size: 36px; color: #DDD6D6; position: relative; z-index: 1; text-transform: uppercase; margin: 0; }
.core-adv-title { font-family: Source Han Sans CN, sans-serif; font-weight: bold; font-size: 36px; color: #354059; position: absolute; top: calc(50% + 18px); left: 50%; transform: translate(-50%, -50%); z-index: 2; margin: 0; white-space: nowrap; }

.ca-scene {
    position: relative;
    width: 100%;
    min-height: 380px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.ca-arch-wrap {
    position: relative;
    width: min(600px, 100%);
    flex-shrink: 0;
}
.ca-arch-svg { width: 100%; display: block; overflow: visible; }

.arch-ring { stroke-width: 1.5; fill: none; }
.arch-ring-mid   { stroke: rgba(26,111,196,0.20); }
.arch-ring-inner { stroke: rgba(26,111,196,0.28); }

.ca-line { stroke: rgba(26,111,196,0.22); stroke-width: 1; stroke-dasharray: 5 5; }
.ca-pulse { fill: #1a6fc4; opacity: 0.9; }

.ca-icon-g { cursor: pointer; transition: transform 0.3s ease; transform-box: fill-box; transform-origin: center; }
.ca-icon-bg { fill: #eef4fd; stroke: rgba(26,111,196,0.28); stroke-width: 1; transition: fill 0.3s, stroke 0.3s; }
.ca-icon-path { color: #5a80b0; transition: color 0.3s; }
.ca-icon-path * { stroke: #5a80b0; transition: stroke 0.3s; }
.ca-icon-g:hover .ca-icon-bg,
.ca-icon-g.is-active .ca-icon-bg { fill: #1a6fc4; stroke: #1a6fc4; }
.ca-icon-g:hover .ca-icon-path *,
.ca-icon-g.is-active .ca-icon-path * { stroke: #ffffff; }

.ca-hub-circle-outer { fill: rgba(26,111,196,0.08); stroke: rgba(26,111,196,0.15); stroke-width: 1; }
.ca-hub-circle-inner { fill: url(#hubGrad); filter: drop-shadow(0 6px 20px rgba(26,111,196,0.45)); }

.ca-hub-text-main { font-size: 14px; font-weight: 700; fill: #fff; }
.ca-hub-text-sub  { font-size: 12px; fill: rgba(255,255,255,0.75); }

.ca-item {
    position: absolute;
    width: 185px;
    padding: 14px 12px 14px 14px;
    background: #fff;
    border: 1px solid #eef1f6;
    border-radius: 6px;
    cursor: default;
    transition: background 0.25s, border-color 0.25s, box-shadow 0.25s, opacity 0.3s;
    opacity: 0.6;
    box-shadow: 0 2px 8px rgba(26,111,196,0.04);
    z-index: 10;
}
.ca-item::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 0;
    background: linear-gradient(180deg, #1a6fc4, #42a5f5);
    transition: height 0.4s ease;
    border-radius: 2px 0 0 2px;
}
.ca-item.is-active {
    opacity: 1;
    border-color: rgba(26,111,196,0.25);
    box-shadow: 0 4px 20px rgba(26,111,196,0.12);
    background: #f7fbff;
}
.ca-item.is-active::before { height: 100%; }

.ca-num { font-size: 13px; font-weight: 700; color: #a0b0c8; letter-spacing: 2px; margin-bottom: 4px; }
.ca-title { font-size: 16px; font-weight: 700; color: #1a2340; margin-bottom: 6px; line-height: 1.45; }
.ca-item.is-active .ca-title { color: #1a6fc4; }
.ca-desc { font-size: 14px; color: #6b7a90; line-height: 1.65; }

@media (max-width: 960px) {
    .ca-scene { min-height: 320px; }
    .ca-arch-wrap { width: min(500px, 90%); }
    .ca-item { width: 145px; font-size: 11px; padding: 10px; }
}
@media (max-width: 600px) {
    .ca-scene { min-height: 0; flex-direction: column; padding-bottom: 24px; }
    .ca-arch-wrap { width: 90%; }
    .ca-item { position: static; width: 90%; margin: 8px auto; opacity: 1; }
}