/* Toast 容器 */
#toast-stage {
    position: fixed;
    top: 80px;
    right: 24px;
    width: 320px;
    z-index: 9999;
    pointer-events: none;
}

#toast-container {
    position: relative;
    width: 100%;
    height: 400px;
    perspective: 1200px;
    transform-style: preserve-3d;
}

/* Toast 基础 */
.toast {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 18px 24px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 500;
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    pointer-events: auto;
    transform-origin: center top;
    will-change: transform, opacity;
}

/* ========== 进入动画状态 ========== */
.toast.entering {
    opacity: 0;
    transform: translateX(-120px) translateZ(50px) rotateY(25deg);
    transition: none;
}

.toast.entering.show {
    opacity: 1;
    transform: translateX(0) translateZ(0) rotateY(0);
    transition:
        transform 0.6s cubic-bezier(0.23, 1, 0.32, 1),
        opacity 0.5s cubic-bezier(0.23, 1, 0.32, 1),
        filter 0.4s ease;
}

/* ========== 堆叠层级系统 ========== */
.toast:nth-child(1) {
    z-index: 5;
    transform: translateZ(0) translateY(0) scale(1);
    opacity: 1;
    filter: brightness(1);
}

.toast:nth-child(2) {
    z-index: 4;
    transform: translateZ(-50px) translateY(24px) scale(0.94);
    opacity: 0.9;
    filter: brightness(0.97);
}

.toast:nth-child(3) {
    z-index: 3;
    transform: translateZ(-100px) translateY(48px) scale(0.88);
    opacity: 0.75;
    filter: brightness(0.94);
}

.toast:nth-child(4) {
    z-index: 2;
    transform: translateZ(-150px) translateY(72px) scale(0.82);
    opacity: 0.6;
    filter: brightness(0.91);
}

.toast:nth-child(5) {
    z-index: 1;
    transform: translateZ(-200px) translateY(96px) scale(0.76);
    opacity: 0.45;
    filter: brightness(0.88);
}

.toast:nth-child(n+6) {
    display: none;
}

/* ========== 层级过渡 ========== */
.toast.shift-down {
    transition:
        transform 0.5s cubic-bezier(0.23, 1, 0.32, 1),
        opacity 0.4s ease,
        filter 0.4s ease;
}

/* ========== 悬停展开 ========== */
#toast-stage:hover .toast {
    transition:
        transform 0.5s cubic-bezier(0.23, 1, 0.32, 1),
        opacity 0.4s ease,
        filter 0.4s ease;
}

#toast-stage:hover .toast:nth-child(1) {
    transform: translateZ(0) translateY(0) scale(1) !important;
    opacity: 1 !important;
    filter: brightness(1) !important;
}

#toast-stage:hover .toast:nth-child(2) {
    transform: translateZ(0) translateY(80px) scale(1) !important;
    opacity: 1 !important;
    filter: brightness(1) !important;
}

#toast-stage:hover .toast:nth-child(3) {
    transform: translateZ(0) translateY(160px) scale(1) !important;
    opacity: 1 !important;
    filter: brightness(1) !important;
}

#toast-stage:hover .toast:nth-child(4) {
    transform: translateZ(0) translateY(240px) scale(1) !important;
    opacity: 1 !important;
    filter: brightness(1) !important;
}

#toast-stage:hover .toast:nth-child(5) {
    transform: translateZ(0) translateY(320px) scale(1) !important;
    opacity: 1 !important;
    filter: brightness(1) !important;
}

/* ========== 退出动画 ========== */
.toast.exiting {
    opacity: 0 !important;
    transform: translateX(100px) translateZ(-100px) scale(0.8) rotateY(-15deg) !important;
    transition:
        transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
        opacity 0.3s ease !important;
    pointer-events: none;
}

#toast-stage:hover .toast.exiting {
    opacity: 0 !important;
    transform: translateX(80px) scale(0.9) !important;
    transition:
        transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        opacity 0.25s ease !important;
}

#toast-stage:hover .toast.exiting:nth-child(1) {
    transform: translateX(80px) translateY(0) scale(0.9) !important;
}

#toast-stage:hover .toast.exiting:nth-child(2) {
    transform: translateX(80px) translateY(80px) scale(0.9) !important;
}

#toast-stage:hover .toast.exiting:nth-child(3) {
    transform: translateX(80px) translateY(160px) scale(0.9) !important;
}

#toast-stage:hover .toast.exiting:nth-child(4) {
    transform: translateX(80px) translateY(240px) scale(0.9) !important;
}

#toast-stage:hover .toast.exiting:nth-child(5) {
    transform: translateX(80px) translateY(320px) scale(0.9) !important;
}

/* ========== 补位动画 ========== */
.toast.reordering {
    transition:
        transform 0.5s cubic-bezier(0.23, 1, 0.32, 1),
        opacity 0.4s ease,
        filter 0.4s ease;
}

/* ========== 类型样式 ========== */
.toast.success {
    background: rgba(240, 253, 244, 0.85);
    color: #166534;
    border-color: rgba(22, 163, 74, 0.2);
}

.toast.error {
    background: rgba(254, 242, 242, 0.85);
    color: #991b1b;
    border-color: rgba(220, 38, 38, 0.2);
}

.toast.info {
    background: rgba(239, 246, 255, 0.85);
    color: #1e40af;
    border-color: rgba(37, 99, 235, 0.2);
}

.toast.warning {
    background: rgba(255, 251, 235, 0.85);
    color: #92400e;
    border-color: rgba(217, 119, 6, 0.2);
}

/* ========== 深色模式 ========== */
.dark .toast.success {
    background: rgba(22, 163, 74, 0.15);
    color: #86efac;
    border-color: rgba(22, 163, 74, 0.25);
}

.dark .toast.error {
    background: rgba(220, 38, 38, 0.15);
    color: #fca5a5;
    border-color: rgba(220, 38, 38, 0.25);
}

.dark .toast.info {
    background: rgba(37, 99, 235, 0.15);
    color: #93c5fd;
    border-color: rgba(37, 99, 235, 0.25);
}

.dark .toast.warning {
    background: rgba(217, 119, 6, 0.15);
    color: #fcd34d;
    border-color: rgba(217, 119, 6, 0.25);
}

/* ========== 手机端适配 ========== */
@media (max-width: 640px) {
    #toast-stage {
        top: auto;
        bottom: 80px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        width: calc(100% - 32px);
        max-width: 400px;
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }

    #toast-container {
        height: auto;
        min-height: 80px;
        perspective: none;
        transform-style: flat;
        display: flex;
        flex-direction: column-reverse;
        align-items: center;
        gap: 8px;
    }

    .toast {
        position: relative;
        width: 100%;
        max-width: 100%;
        padding: 16px 20px;
        border-radius: 16px;
        font-size: 15px;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.1);
        min-height: 56px;
        /* 默认最终状态 */
        transform: translateY(0) scale(1);
        opacity: 1;
    }

    /* 入场：从下方滑入（与出场方向相反，对称） */
    .toast.entering {
        transform: translateY(20px) scale(0.95);
        opacity: 0;
        transition: none;
    }

    .toast.entering.show {
        transform: translateY(0) scale(1);
        opacity: 1;
        /* 与出场动画时间一致 */
        transition:
            transform 0.3s ease,
            opacity 0.25s ease;
    }

    /* 只显示最新 */
    .toast:nth-child(n+2) {
        display: none;
    }

    .toast:nth-child(1) {
        transform: translateY(0) scale(1);
        opacity: 1;
        z-index: 10;
    }

    /* 出场：向下滑出 + 缩小（与入场对称） */
    .toast.exiting {
        transform: translateY(20px) scale(0.95) !important;
        opacity: 0 !important;
        transition:
            transform 0.3s ease,
            opacity 0.25s ease !important;
    }

    .toast.swiping {
        transition: none !important;
        opacity: 0.8;
    }

    .dark .toast {
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
    }
}

@media (max-width: 380px) {
    #toast-stage {
        width: calc(100% - 24px);
        bottom: 70px;
    }

    .toast {
        padding: 14px 16px;
        font-size: 14px;
        min-height: 52px;
    }
}