/* ===== 小花火 AI assistant (js/assistant.js) ===== */

/* desktop: in the bottom-right corner until the visitor drags her somewhere else
   (js/assistant.js, 2026-10-22: bigger, and draggable); phones: bottom-left, see below */
.assistant-fab {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 600;
    width: 96px;
    height: 96px;
    padding: 0;
    border-radius: 50%;
    border: 2px solid var(--line);
    background: var(--surface);
    box-shadow: 0 4px 0 var(--edge), 0 6px 16px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: transform 0.08s ease, box-shadow 0.08s ease, border-color 0.2s;
    -webkit-tap-highlight-color: transparent;
}
.assistant-fab:hover {
    border-color: var(--primary);
}
.assistant-fab:active {
    transform: translateY(4px);
    box-shadow: 0 0 0 transparent;
}
.assistant-fab-face {
    display: block;
    width: 84px;
    margin: 0 auto;
    pointer-events: none;
}
@media (min-width: 769px) and (pointer: fine) {
    .assistant-fab { cursor: grab; touch-action: none; }
    .assistant-fab.dragging {
        cursor: grabbing;
        transform: scale(1.06);
        transition: none;
        box-shadow: 0 10px 0 var(--edge), 0 16px 30px rgba(0, 0, 0, 0.25);
    }
}
/* the tour already has 小花火 on screen */
body:has(.tour) .assistant-fab,
body:has(.tour) .assistant-hint {
    display: none;
}

/* first-visit nudge, to the left of the button */
.assistant-hint {
    position: fixed;
    right: 128px;
    bottom: 54px;
    z-index: 600;
    padding: 7px 12px;
    border-radius: 14px 14px 4px 14px;
    background: var(--primary);
    color: var(--on-primary);
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
    box-shadow: 0 3px 0 var(--primary-edge);
    pointer-events: none;
    animation: assistant-hint 2.4s ease-in-out infinite;
}
.assistant-hint[hidden] {
    display: none;
}
@keyframes assistant-hint {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-4px); }
}
@keyframes assistant-hint-phone {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(4px); }
}

/* --- the chat panel: beside the button on desktop --- */
.assistant-panel {
    position: fixed;
    right: 128px;
    bottom: 20px;
    z-index: 650;
    display: flex;
    flex-direction: column;
    width: min(390px, calc(100vw - 120px));
    height: min(600px, calc(100vh - 120px));
    border-radius: 18px;
    background: var(--surface);
    border: 2px solid var(--line);
    box-shadow: 0 5px 0 var(--edge), 0 14px 34px rgba(0, 0, 0, 0.22);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.98);
    transform-origin: bottom right;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}
.assistant-panel.show {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.assistant-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
    background: var(--surface-2);
}
.assistant-head-face {
    width: 38px;
    height: 38px;
    flex: none;
}
.assistant-head-text {
    flex: 1;
    min-width: 0;
    line-height: 1.25;
}
.assistant-head-text b {
    display: block;
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--text);
}
.assistant-head-text small {
    font-size: 0.75rem;
    color: var(--text-muted);
}
.assistant-icon-btn {
    flex: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
}
.assistant-icon-btn:hover {
    border-color: var(--primary);
    color: var(--text);
}

.assistant-log {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.assistant-msg {
    max-width: 85%;
    padding: 9px 12px;
    border-radius: 14px;
    font-size: 0.9rem;
    line-height: 1.6;
    overflow-wrap: break-word;
}
.assistant-msg.model {
    align-self: flex-start;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-bottom-left-radius: 4px;
    color: var(--text);
}
.assistant-msg.user {
    align-self: flex-end;
    background: var(--primary);
    color: var(--on-primary);
    border-bottom-right-radius: 4px;
}
.assistant-msg code {
    padding: 0 4px;
    border-radius: 4px;
    background: var(--primary-soft);
    font-size: 0.85em;
}
.assistant-sub {
    display: inline-block;
    margin-left: 1.1em;
    color: var(--text-muted);
}
.assistant-msg.typing {
    display: flex;
    gap: 4px;
    padding: 12px 14px;
}
.assistant-msg.typing i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: assistant-dot 1s ease-in-out infinite;
}
.assistant-msg.typing i:nth-child(2) { animation-delay: 0.15s; }
.assistant-msg.typing i:nth-child(3) { animation-delay: 0.3s; }
@keyframes assistant-dot {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(-4px); opacity: 1; }
}

.assistant-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 0 12px 8px;
}
.assistant-chips:empty {
    display: none;
}
.assistant-chip {
    padding: 5px 10px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    text-align: left;
}
.assistant-chip:hover {
    border-color: var(--primary);
    color: var(--text);
}

.assistant-form {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 10px 12px 6px;
    border-top: 1px solid var(--line);
}
.assistant-input {
    flex: 1;
    min-width: 0;
    resize: none;
    max-height: 96px;
    padding: 9px 12px;
    border-radius: 12px;
    border: 2px solid var(--border-input);
    background: var(--bg-input);
    color: var(--text);
    font: inherit;
    font-size: 0.9rem;
    line-height: 1.4;
}
.assistant-input:focus {
    outline: none;
    border-color: var(--primary);
}
.next-btn.assistant-send {
    flex: none;
    padding: 9px 14px;
    font-size: 0.88rem;
}
.next-btn.assistant-send:disabled {
    opacity: 0.6;
    cursor: default;
}
.assistant-note {
    margin: 0;
    padding: 0 12px 10px;
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-muted);
}

/* phones: above the tab bar, and the panel takes most of the screen */
@media (max-width: 768px) {
    /* slides out of the way while scrolling down (js/assistant.js) */
    .assistant-fab, .assistant-hint {
        transition: transform 0.25s ease, opacity 0.25s ease, box-shadow 0.08s ease;
    }
    .assistant-fab.fab-tucked, .assistant-hint.fab-tucked {
        transform: translateX(-90px);
        opacity: 0;
        pointer-events: none;
        animation: none;
    }
    /* bottom-left, whole, just inside the page's side margin; she slides away while
       scrolling down, so she doesn't sit on the text being read */
    .assistant-fab {
        right: auto;
        left: 10px;
        bottom: calc(80px + env(safe-area-inset-bottom));
        width: 50px;
        height: 50px;
    }
    .assistant-fab:active {
        transform: translateY(3px);
    }
    .assistant-fab-face {
        width: 44px;
    }
    .assistant-hint {
        right: auto;
        left: 70px;
        bottom: calc(92px + env(safe-area-inset-bottom));
        border-radius: 14px 14px 14px 4px;
        animation-name: assistant-hint-phone;
    }
    .assistant-panel {
        left: 12px;
        right: 12px;
        transform-origin: bottom left;
        width: auto;
        top: calc(68px + env(safe-area-inset-top));
        bottom: calc(146px + env(safe-area-inset-bottom));
        height: auto;
    }
}

@media (prefers-reduced-motion: reduce) {
    .assistant-hint, .assistant-msg.typing i {
        animation: none;
    }
}
@media print {
    .assistant-fab, .assistant-hint, .assistant-panel {
        display: none;
    }
}