/* Agent-maintained plan: compact progress chip, expanded on hover/focus. */
.agent-plan-progress {
    --agent-plan-surface: var(--card-bg);
    --agent-plan-surface-hover: var(--bg-tertiary);
    --agent-plan-text: var(--text-primary);
    --agent-plan-text-secondary: var(--text-secondary);
    --agent-plan-border: var(--border-color);
    --agent-plan-spinner-track: color-mix(in srgb, var(--accent-color) 30%, transparent);
    --agent-plan-trigger-bottom: 14px;
    --agent-plan-panel-bottom: 70px;
    position: relative;
    z-index: 42;
    flex: 0 0 0;
    width: 100%;
    height: 0;
    display: flex;
    justify-content: center;
    pointer-events: none;
}

.agent-plan-progress[hidden] {
    display: none;
}

.agent-plan-progress-trigger {
    position: absolute;
    right: 50%;
    bottom: var(--agent-plan-trigger-bottom);
    transform: translateX(50%);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 46px;
    padding: 0 18px;
    border: 1px solid var(--agent-plan-border);
    border-radius: 18px;
    color: var(--agent-plan-text);
    background: var(--agent-plan-surface);
    box-shadow: var(--shadow-lg);
    font: inherit;
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    pointer-events: auto;
    transition: background-color 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.agent-plan-progress-trigger:hover,
.agent-plan-progress-trigger:focus-visible {
    color: var(--agent-plan-text);
    background: var(--agent-plan-surface-hover);
    border-color: var(--accent-color);
    outline: none;
}

.agent-plan-progress-panel {
    position: absolute;
    right: 50%;
    bottom: var(--agent-plan-panel-bottom);
    width: max-content;
    min-width: 360px;
    max-width: min(560px, calc(100vw - 40px));
    max-height: min(54vh, 440px);
    padding: 14px 18px;
    overflow: auto;
    border: 1px solid var(--agent-plan-border);
    border-radius: 18px;
    color: var(--agent-plan-text);
    background: var(--agent-plan-surface);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translate(50%, 8px) scale(0.985);
    transform-origin: bottom center;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
}

/*
 * “回到最新消息”只在用户离开底部时出现。它与任务进度同为居中浮层，
 * 两者同时可见时让任务进度上移，保留回到底部按钮靠近输入框的位置。
 */
.chat-return-latest:not([hidden]) + .agent-plan-progress:not([hidden]) {
    --agent-plan-trigger-bottom: 64px;
    --agent-plan-panel-bottom: 120px;
}

.agent-plan-progress.is-hover-active .agent-plan-progress-panel,
.agent-plan-progress:focus-within .agent-plan-progress-panel,
.agent-plan-progress.is-open .agent-plan-progress-panel {
    opacity: 1;
    transform: translate(50%, 0) scale(1);
    visibility: visible;
    pointer-events: auto;
}

.agent-plan-task {
    display: grid;
    grid-template-columns: 22px minmax(0, 1fr);
    align-items: start;
    gap: 10px;
    min-height: 34px;
    padding: 4px 0;
    font-size: 15px;
    font-weight: 570;
    line-height: 1.45;
}

.agent-plan-task-label {
    min-width: 0;
    overflow-wrap: anywhere;
}

.agent-plan-task--completed {
    color: var(--agent-plan-text-secondary);
}

.agent-plan-task--in_progress {
    color: var(--agent-plan-text);
}

.agent-plan-task--pending {
    color: var(--agent-plan-text-secondary);
}

.agent-plan-task-status {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-top: 2px;
    border: 2px solid var(--agent-plan-text-secondary);
    border-radius: 50%;
    box-sizing: border-box;
    flex: 0 0 auto;
}

.agent-plan-task-status--completed {
    border-color: var(--agent-plan-text-secondary);
    color: var(--agent-plan-text-secondary);
}

.agent-plan-task-check {
    width: 13px;
    height: 13px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.agent-plan-task-status--in_progress {
    border-color: var(--agent-plan-spinner-track);
    border-top-color: var(--accent-color);
    animation: agent-plan-spin 820ms linear infinite;
}

.agent-plan-progress-trigger .agent-plan-task-status {
    margin-top: 0;
}

@keyframes agent-plan-spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 640px) {
    .agent-plan-progress {
        --agent-plan-trigger-bottom: 10px;
        --agent-plan-panel-bottom: 66px;
    }

    .chat-return-latest:not([hidden]) + .agent-plan-progress:not([hidden]) {
        --agent-plan-trigger-bottom: 60px;
        --agent-plan-panel-bottom: 116px;
    }

    .agent-plan-progress-panel {
        min-width: min(360px, calc(100vw - 28px));
        max-width: calc(100vw - 28px);
        padding: 12px 15px;
    }

    .agent-plan-progress-trigger {
        min-height: 42px;
        padding: 0 15px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .agent-plan-progress-trigger,
    .agent-plan-progress-panel {
        transition: none;
    }

    .agent-plan-task-status--in_progress {
        animation-duration: 1.8s;
    }
}