/* Duelink AI floating launcher (FAB) */
.duelink-ai-assistant {
    position: relative;
    z-index: 9990;
}

:root {
    --duelink-ai-fab-size: 56px;
    --duelink-ai-fab-gap: 12px;
    --duelink-ai-fab-right: 20px;
    --duelink-ai-fab-bottom: 20px;
    /* index 等页面：右下角控件统一堆叠 */
    --duelink-stack-right: 10px;
    --duelink-stack-base: 20px;
    --duelink-stack-size: 56px;
    --duelink-stack-gap: 12px;
}

.duelink-ai-fab {
    position: fixed;
    right: var(--duelink-ai-fab-right);
    bottom: var(--duelink-ai-fab-bottom);
    z-index: 999;
    width: var(--duelink-ai-fab-size);
    height: var(--duelink-ai-fab-size);
    padding: 0;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: linear-gradient(135deg, #206b8b 0%, #2690b7 100%);
    box-shadow: 0 4px 16px rgba(32, 107, 139, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease, bottom 0.25s ease;
}

.duelink-ai-fab:hover,
.duelink-ai-fab:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(32, 107, 139, 0.42);
    outline: none;
}

.duelink-ai-fab:focus-visible {
    box-shadow: 0 0 0 3px rgba(38, 144, 183, 0.35), 0 8px 24px rgba(32, 107, 139, 0.42);
}

.duelink-ai-fab.is-open {
    transform: scale(0.94);
    opacity: 0.88;
    z-index: 10001;
}

.duelink-ai-fab__graphic {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin-top: 5px;
}

.duelink-ai-fab__icon {
    display: block;
    width: 100%;
    height: 100%;
}

.duelink-ai-fab__badge {
    position: absolute;
    top: -1px;
    right: -1px;
    min-width: 22px;
    padding: 2px 5px;
    border-radius: 8px;
    background: #fff;
    color: #206b8b;
    font-size: 10px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 6px rgba(15, 35, 48, 0.16);
    pointer-events: none;
}

.duelink-ai-hint {
    position: fixed;
    right: calc(var(--duelink-ai-fab-right) + var(--duelink-ai-fab-size) + 16px);
    bottom: calc(var(--duelink-ai-fab-bottom) + 8px);
    z-index: 998;
    max-width: 240px;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    background: #fff;
    box-shadow: 0 4px 20px rgba(15, 35, 48, 0.12);
    opacity: 0;
    transform: translateX(8px);
    transition: opacity 0.25s ease, transform 0.25s ease, bottom 0.25s ease;
    pointer-events: none;
}

.duelink-ai-hint.active {
    opacity: 1;
    transform: translateX(0);
}

.duelink-ai-hint::after {
    content: '';
    position: absolute;
    right: -6px;
    bottom: 18px;
    width: 12px;
    height: 12px;
    background: #fff;
    border-right: 1px solid #e2e8f0;
    border-bottom: 1px solid #e2e8f0;
    transform: rotate(-45deg);
}

.duelink-ai-hint p {
    margin: 0;
    font-size: 13px;
    line-height: 1.55;
    color: #334155;
    font-weight: 500;
}

/*
 * index 等（.back-top + .floating-banner 同页）：
 * 自下而上 AI → TOP → 会員登録再表示，避免与横幅/ pill 重叠
 */
body:has(.duelink-ai-assistant):has(.back-top) {
    --duelink-ai-fab-right: var(--duelink-stack-right);
    --duelink-ai-fab-bottom: var(--duelink-stack-base);
}

body:has(.duelink-ai-assistant):has(.back-top) .back-top {
    right: var(--duelink-stack-right);
    bottom: calc(var(--duelink-stack-base) + var(--duelink-stack-size) + var(--duelink-stack-gap));
    z-index: 1000;
}

body:has(.duelink-ai-assistant):has(.back-top) .floating-banner-reopen.is-visible {
    right: var(--duelink-stack-right);
    bottom: calc(var(--duelink-stack-base) + (var(--duelink-stack-size) + var(--duelink-stack-gap)) * 2);
    z-index: 1001;
}

/* 底部横幅展开时，整列堆叠移到横幅上方 */
body:has(.floating-banner:not(.hidden)) {
    --duelink-stack-base: 92px;
}

@media (max-width: 1024px) {
    body:has(.floating-banner:not(.hidden)) {
        --duelink-stack-base: 128px;
    }
}

@media (max-width: 768px) {
    :root {
        --duelink-ai-fab-size: 52px;
        --duelink-stack-size: 52px;
    }

    .duelink-ai-fab {
        --duelink-ai-fab-right: 20px;
        --duelink-ai-fab-bottom: 16px;
    }

    body:has(.duelink-ai-assistant):has(.back-top) {
        --duelink-stack-right: 20px;
        --duelink-stack-base: 16px;
    }

    body:has(.floating-banner:not(.hidden)) {
        --duelink-stack-base: 148px;
    }

    .duelink-ai-fab__graphic {
        width: 38px;
        height: 38px;
        margin-top: 4px;
    }

    .duelink-ai-fab__badge {
        top: 0;
        right: 0;
        min-width: 20px;
        padding: 2px 4px;
        font-size: 9px;
    }

    .duelink-ai-hint {
        max-width: 180px;
        padding: 10px 12px;
    }

    .duelink-ai-hint p {
        font-size: 12px;
    }
}