html, body, #cesiumContainer { width: 100%; height: 100%; margin: 0; padding: 0; overflow: hidden; }

.model-credit {
    position: fixed;
    top: 14px;
    left: 50%;
    z-index: 9998;
    max-width: min(520px, calc(100vw - 360px));
    transform: translateX(-50%);
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-height: 34px;
    padding: 7px 14px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 8px;
    background: rgba(15, 20, 28, 0.58);
    color: #f7fbff;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    font-size: 13px;
    font-weight: 650;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(6px);
    transition:
        background 0.16s ease,
        border-color 0.16s ease,
        transform 0.16s ease;
}

.model-credit:hover {
    border-color: rgba(255, 255, 255, 0.36);
    background: rgba(25, 33, 45, 0.72);
    transform: translateX(-50%) translateY(-1px);
}

.credit-row {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.model-credit a {
    color: #9ed7ff;
    text-decoration: none;
    border-bottom: 1px solid rgba(158, 215, 255, 0.55);
}

.model-credit a:hover {
    color: #d7f0ff;
    border-bottom-color: currentColor;
}

.source {
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 999;
    padding: 12px;
    margin-bottom: 0;
    border-radius: 50%;
    background-color: #fff;
    opacity: 0.9;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.15);
    transition:
        opacity 0.16s ease,
        transform 0.16s ease,
        box-shadow 0.16s ease;
}

.source:hover {
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.source img {
    display: block;
    width: 24px;
    height: 24px;
}

.hud {
    position: fixed;
    left: 12px;
    top: 12px;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.45);
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    font-size: 16px;
    line-height: 1.3;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    pointer-events: none;
}

.hud .row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}
.hud .row:last-child {
    margin-bottom: 0;
}

kbd {
    display: inline-block;
    padding: 4px 7px;
    min-width: 20px;
    text-align: center;
    font-family: ui-monospace, "SFMono-Regular", Menlo, Monaco, "Roboto Mono", "Segoe UI Mono", monospace;
    font-size: 12px;
    line-height: 1;
    color: #111;
    background: linear-gradient(#f6f6f6, #e3e3e3);
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-bottom-width: 2px;
    border-radius: 6px;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.6) inset,
        0 2px 4px rgba(0, 0, 0, 0.25);
}

.hint-text {
    color: #e6eef6;
    font-size: 13px;
}
.hint-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 返回首页链接 */
.back-link {
    position: fixed;
    left: 12px;
    bottom: 12px;
    z-index: 9999;
    color: #cfe3ff;
    background: rgba(0, 0, 0, 0.45);
    padding: 6px 10px;
    border-radius: 6px;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial;
    font-size: 13px;
    text-decoration: none;
    backdrop-filter: blur(4px);
}
.back-link:hover { color: #fff; }

@media (max-width: 768px) {
    .model-credit {
        top: 8px;
        max-width: calc(100vw - 16px);
        min-height: 30px;
        padding: 6px 10px;
        font-size: 11px;
    }
    .hud {
        display: none;
    }
    .source {
        display: none;
    }
    kbd {
        padding: 3px 6px;
        min-width: 18px;
        font-size: 11px;
    }
}