/**
 * AI Assistant — standalone stylesheet
 * 独立样式文件，不依赖宿主页面的 CSS 变量。
 * 通过 CSS 变量提供主题定制入口，宿主页面可通过覆盖变量适配主题。
 */

/* ---- Theme Variables ---- */
/* :root defaults pick up host-page variables if available, fallback to built-in values */
:root {
    --ai-primary: var(--primary, #6366f1);
    --ai-primary-dark: var(--primary-dark, var(--primary, #4f46e5));
    --ai-secondary: var(--secondary, #00d4aa);
    --ai-accent: var(--accent, #f59e0b);
    --ai-dark: var(--dark, #1a1a2e);
    --ai-darker: var(--darker, #12122a);
    --ai-light: var(--light, #f8fafc);
    --ai-gray: var(--gray, #94a3b8);
    --ai-card-bg: var(--card-bg, rgba(255,255,255,0.06));
    --ai-card-border: var(--card-border, rgba(255,255,255,0.1));
}

/* ========================================
   Panel & Layout
   ======================================== */

.ai-assistant-panel {
    position: fixed; top: 48px; right: 0; bottom: 0;
    width: 420px; min-width: 300px; max-width: 650px;
    display: flex; flex-direction: column;
    background: var(--ai-darker);
    color: var(--ai-light);
    border-left: 1px solid var(--ai-card-border);
    overflow: hidden;
    z-index: 1500;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
    box-shadow: -4px 0 24px rgba(0,0,0,0.1);
}
.ai-assistant-panel.open { transform: translateX(0); }

.ai-assistant-panel-resize-handle {
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 5px; cursor: col-resize; z-index: 1;
}
.ai-assistant-panel-resize-handle:hover,
.ai-assistant-panel-resize-handle.active { background: var(--ai-primary); }

/* ---- Backdrop ---- */
.ai-assistant-backdrop {
    display: none; position: fixed; inset: 0; z-index: 1499;
    background: rgba(0,0,0,0.15);
}

/* ---- Toggle Button ---- */
.ai-assistant-toggle-btn {
    position: fixed; right: 0; top: 50%; transform: translateY(-50%);
    width: 40px; padding: 8px 6px;
    border-radius: 8px 0 0 8px;
    background: linear-gradient(135deg, var(--ai-primary), var(--ai-primary-dark));
    box-shadow: -2px 0 16px rgba(99,102,241,0.35);
    z-index: 1400; border: none; color: #fff; cursor: pointer;
    font-size: 1rem; font-weight: 600;
    transition: padding-left 0.2s, box-shadow 0.2s;
    display: flex; flex-direction: column; align-items: center;
    gap: 4px; line-height: 1.2;
}
.ai-assistant-toggle-btn span {
    font-size: 0.85rem; writing-mode: vertical-rl; letter-spacing: 2px;
}
.ai-assistant-toggle-btn:hover {
    padding-left: 10px;
    box-shadow: -4px 0 24px rgba(99,102,241,0.55);
}
.ai-assistant-toggle-btn .badge {
    position: absolute; top: -2px; right: -2px;
    width: 18px; height: 18px; border-radius: 50%;
    background: var(--ai-accent); color: #000; font-size: 0.6rem;
    font-weight: 700; display: none; align-items: center; justify-content: center;
}

/* ---- Header ---- */
.ai-assistant-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--ai-card-border);
    flex-shrink: 0;
}
.ai-assistant-header-left {
    display: flex; align-items: center; gap: 6px;
}
.ai-assistant-logo { font-size: 1.1rem; }
.ai-assistant-title { font-size: 0.85rem; font-weight: 600; }
.ai-assistant-header-actions { display: flex; gap: 4px; }
.ai-assistant-btn-icon {
    background: none; border: none; color: var(--ai-gray);
    cursor: pointer; font-size: 0.85rem; padding: 2px 4px;
    border-radius: 4px; font-family: inherit;
}
.ai-assistant-btn-icon:hover { color: var(--ai-light); background: rgba(0,0,0,0.04); }
.ai-conv-new-btn {
    background: rgba(99,102,241,0.2); border: none; color: var(--ai-primary);
    cursor: pointer; font-size: 1rem; font-weight: 600;
    padding: 2px 8px; border-radius: 4px; font-family: inherit;
    line-height: 1.4;
}
.ai-conv-new-btn:hover { background: rgba(99,102,241,0.35); }

/* ---- Messages ---- */
.ai-assistant-messages {
    flex: 1; overflow-y: auto; padding: 0.75rem;
    display: flex; flex-direction: column; gap: 0.75rem;
}
.ai-assistant-messages::-webkit-scrollbar { width: 4px; }
.ai-assistant-messages::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.06); border-radius: 2px; }

/* ---- Welcome ---- */
.ai-assistant-welcome {
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; text-align: center; padding: 1.5rem 0;
    color: var(--ai-gray); gap: 0.5rem; flex: 1;
}
.ai-assistant-welcome-icon { font-size: 2.5rem; opacity: 0.4; }
.ai-assistant-welcome p { font-size: 0.85rem; margin: 0; }
.ai-assistant-welcome-hints { font-size: 0.75rem !important; opacity: 0.6; }
.ai-assistant-quick-actions {
    display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
    margin-top: 0.75rem;
}
.ai-assistant-quick-actions button {
    background: var(--ai-card-bg); border: 1px solid var(--ai-card-border);
    color: var(--ai-light); font-size: 0.72rem; padding: 5px 10px;
    border-radius: 14px; cursor: pointer; font-family: inherit;
    white-space: nowrap; transition: all 0.15s;
}
.ai-assistant-quick-actions button:hover {
    border-color: var(--ai-primary); background: rgba(99,102,241,0.12);
}

/* ---- Input ---- */
.ai-assistant-input-area {
    display: flex; align-items: flex-end; gap: 6px;
    padding: 0.5rem 0.75rem; border-top: 1px solid var(--ai-card-border);
    flex-shrink: 0;
}
.ai-assistant-input {
    flex: 1; background: var(--ai-card-bg); border: 1px solid var(--ai-card-border);
    border-radius: 8px; color: var(--ai-light); font-size: 0.82rem;
    padding: 8px 10px; resize: none; font-family: inherit;
    line-height: 1.4; max-height: 120px; outline: none;
    transition: border-color 0.15s;
}
.ai-assistant-input:focus { border-color: var(--ai-primary); }
.ai-assistant-input::placeholder { color: var(--ai-gray); opacity: 0.5; }
.ai-assistant-send-btn, .ai-assistant-stop-btn {
    width: 34px; height: 34px; border-radius: 8px; border: none;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; transition: all 0.15s;
}
.ai-assistant-send-btn { background: var(--ai-primary); color: #fff; }
.ai-assistant-send-btn:hover { background: var(--ai-primary-dark); }
.ai-assistant-stop-btn { background: rgba(239,68,68,0.2); color: #ef4444; }
.ai-assistant-stop-btn:hover { background: rgba(239,68,68,0.35); }

/* ========================================
   Chat Messages
   ======================================== */

.ai-message { display: flex; flex-direction: column; max-width: 100%; }
.ai-message.user { align-items: flex-end; }
.ai-message.assistant { align-items: flex-start; flex-direction: row; gap: 6px; }
.ai-message-avatar { font-size: 1rem; flex-shrink: 0; margin-top: 2px; }
.ai-message-body {
    max-width: 100%; padding: 0.6rem 0.75rem; border-radius: 12px;
    font-size: 0.82rem; line-height: 1.55; word-break: break-word;
    overflow-wrap: break-word;
}
.ai-message.user .ai-message-body {
    background: var(--ai-primary); color: #fff;
    border-radius: 14px 4px 14px 14px;
}
.ai-message.assistant .ai-message-body {
    background: var(--ai-card-bg); flex: 1;
    border-radius: 4px 14px 14px 14px;
}
.ai-message-body p { margin: 0 0 0.5rem; }
.ai-message-body p:last-child { margin-bottom: 0; }
.ai-message-body h2, .ai-message-body h3, .ai-message-body h4 {
    margin: 0.5rem 0 0.35rem; font-weight: 600;
}
.ai-message-body h2 { font-size: 0.95rem; }
.ai-message-body h3 { font-size: 0.85rem; }
.ai-message-body h4 { font-size: 0.8rem; }
.ai-message-body ul, .ai-message-body ol { margin: 0.25rem 0; padding-left: 1.2rem; }
.ai-message-body li { margin-bottom: 0.15rem; font-size: 0.8rem; }
.ai-message-body code {
    background: rgba(0,0,0,0.04); padding: 1px 5px;
    border-radius: 3px; font-size: 0.78rem;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
}
.ai-message-body pre {
    background: #f1f4f9; border-radius: 8px; padding: 0.65rem 0.75rem;
    overflow-x: auto; font-size: 0.78rem; margin: 0.5rem 0;
    border: 1px solid rgba(0,0,0,0.06);
}
.ai-message-body pre code { background: none; padding: 0; font-size: 0.78rem; }
.ai-message-body strong { font-weight: 600; }
.ai-message-body em { font-style: italic; }
.ai-message-body del { text-decoration: line-through; opacity: 0.7; }
.ai-message-body a { color: var(--ai-accent); text-decoration: underline; }
.ai-message-body a:hover { color: var(--ai-primary); }
.ai-message-body blockquote {
    border-left: 3px solid var(--ai-accent); margin: 0.4rem 0;
    padding: 0.3rem 0.6rem; color: var(--ai-gray);
}
.ai-message-body hr {
    border: none; border-top: 1px solid rgba(0,0,0,0.06);
    margin: 0.5rem 0;
}
.ai-message-body table {
    border-collapse: collapse; width: 100%; margin: 0.5rem 0; font-size: 0.78rem;
}
.ai-message-body th, .ai-message-body td {
    border: 1px solid rgba(0,0,0,0.08); padding: 4px 8px; text-align: left;
}
.ai-message-body th { background: rgba(0,0,0,0.04); font-weight: 600; }
.ai-message-body img { max-width: 100%; border-radius: 6px; }

/* ---- Typing Indicator ---- */
.ai-typing-indicator { display: inline-flex; gap: 4px; padding: 4px 0; }
.ai-typing-indicator span {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--ai-gray); animation: ai-typing 1.4s ease-in-out infinite;
}
.ai-typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes ai-typing {
    0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
    30% { opacity: 1; transform: translateY(-2px); }
}

/* ---- Tool Executing ---- */
.ai-tool-executing {
    display: flex; align-items: center; gap: 6px;
    padding: 6px 0; font-size: 0.75rem; color: var(--ai-gray);
    border-top: 1px solid var(--ai-card-border); margin-top: 8px;
}

/* ========================================
   Proposal Card
   ======================================== */

.ai-message-proposal {
    border: 1px solid var(--ai-accent); border-radius: 10px;
    padding: 0.75rem; margin-top: 0.75rem;
    background: rgba(245,158,11,0.06);
    transition: border-color 0.2s;
}
.ai-message-proposal.applied {
    border-color: var(--ai-secondary); background: rgba(0,212,170,0.06);
}
.ai-message-proposal.rejected {
    border-color: var(--ai-card-border); opacity: 0.6;
}
.ai-proposal-title {
    display: flex; align-items: center; gap: 6px;
    font-size: 0.78rem; font-weight: 600; margin-bottom: 6px;
}
.ai-proposal-icon { font-size: 0.9rem; }
.ai-proposal-content { margin-bottom: 8px; }
.ai-proposal-content pre {
    background: #f1f4f9; border-radius: 6px; padding: 0.5rem;
    font-size: 0.75rem; overflow-x: auto; max-height: 200px;
    overflow-y: auto; margin: 0;
}
.ai-proposal-content code { font-size: 0.75rem; }
.ai-proposal-actions { display: flex; gap: 6px; }
.ai-proposal-btn {
    font-size: 0.72rem; padding: 4px 12px; border-radius: 6px;
    border: 1px solid; cursor: pointer; font-family: inherit;
    transition: all 0.15s;
}
.ai-proposal-btn.apply {
    background: rgba(0,212,170,0.15); border-color: var(--ai-secondary);
    color: var(--ai-secondary);
}
.ai-proposal-btn.apply:hover { background: rgba(0,212,170,0.3); }
.ai-proposal-btn.reject {
    background: rgba(239,68,68,0.1); border-color: #ef4444;
    color: #ef4444;
}
.ai-proposal-btn.reject:hover { background: rgba(239,68,68,0.2); }
.ai-proposal-status { font-size: 0.72rem; font-weight: 500; }
.ai-proposal-status.applied { color: var(--ai-secondary); }
.ai-proposal-status.rejected { color: var(--ai-gray); }

/* ========================================
   Tool Call Summary
   ======================================== */

.ai-tool-summary { display: flex; flex-direction: column; gap: 8px; }
.ai-tool-summary-item {
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 8px; overflow: hidden;
}
.ai-tool-summary-header {
    display: flex; align-items: center; gap: 6px;
    padding: 8px 12px; font-size: 0.8rem;
    background: rgba(0,0,0,0.03);
    border-bottom: 1px solid rgba(0,0,0,0.04);
}
.ai-tool-summary-status {
    margin-left: auto; font-size: 0.7rem; opacity: 0.6;
}
.ai-tool-summary-content {
    padding: 10px 12px; font-size: 0.8rem;
}
.ai-tool-summary-content pre {
    margin: 0; padding: 8px; background: rgba(0,0,0,0.04);
    border: none; border-radius: 4px; max-height: 140px;
    overflow: auto; font-size: 0.72rem;
}
.ai-tool-summary-content pre::-webkit-scrollbar { width: 4px; }
.ai-tool-summary-content pre::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.08); border-radius: 2px; }

/* ========================================
   Conversation Dropdown
   ======================================== */

.ai-conv-dropdown { position: relative; }
.ai-conv-dropdown-btn {
    display: flex; align-items: center; gap: 4px;
    padding: 4px 8px; border-radius: 6px;
    background: rgba(0,0,0,0.04); border: none;
    color: var(--ai-light); font-size: 0.85rem; font-weight: 500;
    cursor: pointer; max-width: 180px;
    transition: background 0.15s;
}
.ai-conv-dropdown-btn:hover { background: rgba(0,0,0,0.1); }
.ai-conv-dropdown-title {
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    max-width: 140px;
}
.ai-conv-dropdown-arrow {
    font-size: 0.65rem; opacity: 0.6; flex-shrink: 0;
}
.ai-conv-dropdown-menu {
    position: absolute; top: calc(100% + 4px); left: 0;
    width: 240px; background: var(--ai-dark); border: 1px solid rgba(0,0,0,0.06);
    border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    z-index: 100; overflow: hidden;
}
.ai-conv-dropdown-list {
    max-height: 240px; overflow-y: auto;
}
.ai-conv-dropdown-list::-webkit-scrollbar { width: 4px; }
.ai-conv-dropdown-list::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.08); border-radius: 2px; }
.ai-conv-dropdown-item {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 12px; cursor: pointer; transition: background 0.1s;
    border-bottom: 1px solid rgba(0,0,0,0.04);
}
.ai-conv-dropdown-item:hover { background: rgba(0,0,0,0.04); }
.ai-conv-dropdown-item.active {
    background: rgba(99,102,241,0.15);
}
.ai-conv-dropdown-item-title {
    flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    font-size: 0.82rem; color: var(--ai-light);
}
.ai-conv-dropdown-item-date {
    font-size: 0.7rem; color: var(--ai-gray); flex-shrink: 0;
}
.ai-conv-dropdown-item-delete {
    flex-shrink: 0; width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    border: none; background: none; color: var(--ai-gray);
    font-size: 1rem; cursor: pointer; border-radius: 4px;
    opacity: 0; transition: opacity 0.15s, background 0.15s, color 0.15s;
}
.ai-conv-dropdown-item:hover .ai-conv-dropdown-item-delete { opacity: 1; }
.ai-conv-dropdown-item-delete:hover { background: rgba(239,68,68,0.15); color: #ef4444; }
.ai-conv-dropdown-new {
    display: block; width: 100%; padding: 10px;
    border: none; background: none; color: var(--ai-primary);
    font-size: 0.82rem; cursor: pointer; text-align: center;
    border-top: 1px solid rgba(0,0,0,0.04);
    transition: background 0.15s;
}
.ai-conv-dropdown-new:hover { background: rgba(0,0,0,0.04); }

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 1023px) {
    .ai-assistant-panel { width: min(100vw, 420px); }
}
@media (max-width: 768px) {
    .ai-assistant-panel { width: min(100vw, 420px); }
    .ai-assistant-toggle-btn {
        width: 32px; padding: 6px 4px; font-size: 0.85rem;
    }
}