@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500&family=DM+Mono:wght@400;500&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff; --bg-2: #f5f5f7; --bg-3: #ebebed; --bg-4: #dcdde0;
  --border: rgba(0,0,0,0.08); --border-hover: rgba(0,0,0,0.15);
  --text-1: #111113; --text-2: #5c5f6e; --text-3: #9a9ca8;
  --accent: #4a6fff; --accent-dim: rgba(74,111,255,0.10);
  --danger: #ff6b6b; --success: #3aaa5c;
  --radius: 14px; --radius-sm: 8px;
  --font: 'DM Sans', sans-serif; --mono: 'DM Mono', monospace;
}

html, body {
  height: 100%; background: var(--bg); color: var(--text-1);
  font-family: var(--font); font-size: 15px; line-height: 1.6;
}

/* ── 消息气泡 ── */
.message { display: flex; gap: 12px; margin-bottom: 24px; animation: fadeUp 0.2s ease; }
@keyframes fadeUp { from { opacity:0; transform:translateY(6px); } to { opacity:1; transform:none; } }
.message.user { flex-direction: row-reverse; }
.avatar { width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 500; }
.avatar.user { background: var(--accent-dim); border: 1px solid rgba(108,143,255,0.3); color: var(--accent); }
.avatar.ai { background: var(--bg-3); border: 1px solid var(--border); color: var(--text-2); }
.bubble-wrap { display: flex; flex-direction: column; gap: 4px; max-width: 80%; }
.message.user .bubble-wrap { align-items: flex-end; }
.bubble { padding: 11px 16px; border-radius: var(--radius); font-size: 14.5px; line-height: 1.65; word-break: break-word; }
.message.user .bubble { background: var(--accent-dim); border: 1px solid rgba(108,143,255,0.2); border-bottom-right-radius: 4px; white-space: pre-wrap; }
.message.ai .bubble { background: var(--bg-2); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.message.ai .bubble p { margin-bottom: 8px; }
.message.ai .bubble p:last-child { margin-bottom: 0; }
.message.ai .bubble strong { font-weight: 500; }
.message.ai .bubble ul, .message.ai .bubble ol { padding-left: 20px; margin-bottom: 8px; }
.message.ai .bubble li { margin-bottom: 4px; }
.message.ai .bubble h1,.message.ai .bubble h2,.message.ai .bubble h3 { font-weight: 500; margin: 12px 0 6px; }
.message.ai .bubble h1:first-child,.message.ai .bubble h2:first-child,.message.ai .bubble h3:first-child { margin-top: 0; }
.message.ai .bubble table { border-collapse: collapse; width: 100%; margin-bottom: 8px; font-size: 13px; }
.message.ai .bubble th,.message.ai .bubble td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.message.ai .bubble th { background: var(--bg-3); font-weight: 500; }
.message.ai .bubble code { font-family: var(--mono); font-size: 12px; background: var(--bg-3); padding: 1px 5px; border-radius: 4px; }
.message.ai .bubble pre { background: var(--bg-3); padding: 12px; border-radius: var(--radius-sm); margin-bottom: 8px; overflow-x: auto; }
.message.ai .bubble pre code { background: none; padding: 0; }
.bubble-meta { font-size: 11px; color: var(--text-3); padding: 0 4px; }

/* ── 输入区 ── */
.input-area { border-top: 1px solid var(--border); background: var(--bg); padding: 16px 24px 20px; flex-shrink: 0; }
.input-wrap { max-width: 760px; margin: 0 auto; }
.input-box { display: flex; align-items: flex-end; gap: 8px; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 10px 10px 14px; transition: border-color 0.15s; }
.input-box:focus-within { border-color: rgba(108,143,255,0.4); }
.input-box textarea { flex: 1; background: none; border: none; outline: none; resize: none; font-family: var(--font); font-size: 14.5px; color: var(--text-1); line-height: 1.6; min-height: 24px; max-height: 180px; overflow-y: auto; padding: 0; }
.input-box textarea::placeholder { color: var(--text-3); }
.input-actions { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.icon-btn { width: 34px; height: 34px; border-radius: var(--radius-sm); border: none; background: none; cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--text-3); transition: all 0.15s; font-size: 17px; }
.icon-btn:hover { background: var(--bg-3); color: var(--text-2); }
.icon-btn.recording { color: var(--danger); animation: recPulse 1s infinite; }
@keyframes recPulse { 0%,100%{opacity:1} 50%{opacity:0.4} }
.send-btn { width: 34px; height: 34px; border-radius: var(--radius-sm); border: none; background: var(--accent); cursor: pointer; display: flex; align-items: center; justify-content: center; color: #fff; transition: all 0.15s; font-size: 16px; flex-shrink: 0; }
.send-btn:hover:not(:disabled) { background: #7d9fff; transform: scale(1.04); }
.send-btn:disabled { background: var(--bg-4); color: var(--text-3); cursor: not-allowed; }
.input-hint { font-size: 11px; color: var(--text-3); margin-top: 8px; text-align: center; }

/* ── 消息操作栏 ── */
.msg-actions { display: flex; gap: 4px; margin-top: 6px; padding: 0 2px; opacity: 0; transition: opacity 0.15s; }
.message.ai:hover .msg-actions { opacity: 1; }
.action-btn { display: flex; align-items: center; gap: 5px; padding: 4px 10px; border-radius: 20px; border: 1px solid var(--border); background: var(--bg-3); color: var(--text-3); font-size: 11px; cursor: pointer; font-family: var(--font); transition: all 0.15s; white-space: nowrap; }
.action-btn:hover { border-color: var(--border-hover); color: var(--text-2); background: var(--bg-4); }
.action-btn.success { color: var(--success); border-color: rgba(116,199,138,0.4); }
.action-btn.deep-btn { color: #ff9a4a; border-color: rgba(255,154,74,0.3); background: rgba(255,154,74,0.08); }
.action-btn.deep-btn:hover { background: rgba(255,154,74,0.15); border-color: rgba(255,154,74,0.5); }
.action-btn.deep-btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── 代码块 ── */
.code-block { position: relative; margin-bottom: 10px; }
.code-toolbar { display: flex; align-items: center; justify-content: space-between; background: var(--bg-4); border: 1px solid var(--border); border-bottom: none; border-radius: var(--radius-sm) var(--radius-sm) 0 0; padding: 5px 12px; }
.code-lang { font-size: 11px; color: var(--text-3); font-family: var(--mono); text-transform: uppercase; }
.code-actions { display: flex; gap: 4px; }
.code-btn { display: flex; align-items: center; gap: 4px; padding: 3px 9px; border-radius: 12px; border: 1px solid var(--border); background: none; color: var(--text-3); font-size: 11px; cursor: pointer; font-family: var(--font); transition: all 0.15s; }
.code-btn:hover { background: var(--bg-3); color: var(--text-2); }
.code-btn.success { color: var(--success); }
.code-block pre { border-radius: 0 0 var(--radius-sm) var(--radius-sm) !important; margin-bottom: 0 !important; border: 1px solid var(--border); }

/* ── 附件预览 ── */
.attachment-preview { margin-bottom: 8px; }
.attachment-preview img { max-width: 240px; max-height: 180px; border-radius: 10px; display: block; border: 1px solid var(--border); }
.file-chip { display: inline-flex; align-items: center; gap: 7px; padding: 7px 12px; border-radius: var(--radius-sm); background: var(--bg-3); border: 1px solid var(--border); font-size: 12px; color: var(--text-2); }
.pending-attachments { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.pending-item { display: flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: var(--radius-sm); background: var(--bg-3); border: 1px solid var(--border); font-size: 12px; color: var(--text-2); }
.pending-item img { width: 36px; height: 36px; object-fit: cover; border-radius: 5px; }
.pending-remove { cursor: pointer; color: var(--text-3); font-size: 14px; background: none; border: none; padding: 0 0 0 4px; }
.pending-remove:hover { color: var(--danger); }

/* ── 打字动画 ── */
.typing { display: flex; gap: 4px; align-items: center; padding: 12px 16px; }
.typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--text-3); animation: pulse 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse { 0%,80%,100%{opacity:0.3;transform:scale(0.8)} 40%{opacity:1;transform:scale(1)} }

/* ── 错误气泡 ── */
.error-bubble { background: rgba(255,107,107,0.1); border: 1px solid rgba(255,107,107,0.2); color: #ff9a9a; font-size: 13px; padding: 10px 14px; border-radius: var(--radius-sm); }

/* ── Toast ── */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(10px); background: var(--bg-3); border: 1px solid var(--border); padding: 10px 18px; border-radius: 20px; font-size: 13px; color: var(--text-2); opacity: 0; transition: all 0.2s; pointer-events: none; z-index: 200; white-space: nowrap; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── 语音弹窗 ── */
.voice-modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(4px); z-index: 100; align-items: center; justify-content: center; }
.voice-modal.open { display: flex; }
.voice-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: 20px; padding: 40px 48px; display: flex; flex-direction: column; align-items: center; gap: 20px; min-width: 300px; }
.voice-orb { width: 80px; height: 80px; border-radius: 50%; background: var(--danger); display: flex; align-items: center; justify-content: center; font-size: 32px; cursor: pointer; animation: orbPulse 1.5s infinite; }
@keyframes orbPulse { 0%{box-shadow:0 0 0 0 rgba(255,107,107,0.4)} 70%{box-shadow:0 0 0 20px rgba(255,107,107,0)} 100%{box-shadow:0 0 0 0 rgba(255,107,107,0)} }
.voice-timer { font-size: 28px; font-family: var(--mono); color: var(--text-1); }
.voice-cancel { padding: 8px 20px; border-radius: 20px; border: 1px solid var(--border); background: none; color: var(--text-2); cursor: pointer; font-family: var(--font); font-size: 13px; }

/* ── 预览弹窗 ── */
.preview-modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(6px); z-index: 300; flex-direction: column; }
.preview-modal.open { display: flex; }
.preview-header { height: 52px; background: var(--bg-2); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 20px; gap: 12px; flex-shrink: 0; }
.preview-title { font-size: 13px; color: var(--text-2); flex: 1; font-family: var(--mono); }
.preview-close { width: 32px; height: 32px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: none; color: var(--text-2); cursor: pointer; font-size: 16px; display: flex; align-items: center; justify-content: center; }
.preview-close:hover { background: var(--bg-3); }
.preview-iframe { flex: 1; border: none; background: #fff; }

/* ── 空状态 ── */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 60vh; gap: 12px; color: var(--text-3); }
.empty-icon { font-size: 40px; opacity: 0.4; }
.empty-title { font-size: 20px; font-weight: 500; color: var(--text-2); }
.empty-sub { font-size: 14px; }
.suggestions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; justify-content: center; }
.suggestion-chip { padding: 8px 16px; border-radius: 20px; border: 1px solid var(--border); color: var(--text-2); font-size: 13px; cursor: pointer; transition: all 0.15s; background: transparent; font-family: var(--font); }
.suggestion-chip:hover { border-color: var(--border-hover); color: var(--text-1); background: var(--bg-3); }

/* ── 聊天页面布局 ── */
.chat-layout { display: flex; flex-direction: column; height: 100vh; background: var(--bg); }
.topbar { height: 52px; flex-shrink: 0; border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 24px; gap: 12px; }
.topbar-title { font-size: 14px; font-weight: 500; color: var(--text-2); flex: 1; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); flex-shrink: 0; transition: all 0.3s; }
.status-dot.online { background: var(--success); box-shadow: 0 0 6px rgba(116,199,138,0.5); }
.messages { flex: 1; overflow-y: auto; padding: 32px 0; scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }
.messages::-webkit-scrollbar { width: 4px; }
.messages::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 2px; }
.msg-group { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* ── 移动端 ── */
@media (max-width: 768px) {
  .topbar { padding: 0 12px; }
  .topbar-title { font-size: 13px; }
  .messages { padding: 16px 0; }
  .msg-group { padding: 0 12px; }
  .bubble { font-size: 14px; padding: 10px 13px; }
  .bubble-wrap { max-width: 90%; }
  .input-area { padding: 10px 12px 16px; }
  .input-hint { display: none; }
  .icon-btn { width: 30px; height: 30px; font-size: 15px; }
  .send-btn { width: 36px; height: 36px; }
}
@media (max-width: 480px) {
  .avatar { width: 28px; height: 28px; font-size: 11px; }
  .message { gap: 8px; margin-bottom: 16px; }
}