:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sb-w: 268px;
  --msg-w: 780px;
  --msg-gap: 24px;
  --logo-w: 56px;
  --r-newchat: 20px;
  --r-search: 20px;
  --r-item: 8px;
  --r-bubble: 20px 20px 6px 20px;
  --r-table: 6px;
  --r-input: 28px;
  --r-toggle: 10px;
  --r-send: 12px;
  --newchat-align: center;
  --bg-primary: #ffffff;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f2f3f5;
  --bg-sidebar: #f7f8fa;
  --bg-input: #ffffff;
  --bg-message-user: #e8efff;
  --bg-message-ai: #ffffff;
  --bg-hover: rgba(15, 23, 42, 0.05);
  --bg-active: #e6ebff;
  --bg-newchat: transparent;
  --bg-newchat-hover: rgba(61, 90, 254, 0.07);
  --bg-toggle-on: #e6ebff;
  --text-primary: #1f2329;
  --text-secondary: #2b2f36;
  --text-tertiary: #8a8f98;
  --text-user: #1f2329;
  --text-on-accent-soft: #3d5afe;
  --border-primary: #e8eaee;
  --border-secondary: #d5d8de;
  --border-focus: #3d5afe;
  --accent: #3d5afe;
  --accent-hover: #2f4be6;
  --accent-soft: rgba(61, 90, 254, 0.1);
  --sb-border: 1px solid #eceef1;
  --newchat-border: 1.5px solid #3d5afe;
  --search-bg: #eceef2;
  --search-border: 1px solid transparent;
  --toggle-bg: #f2f3f5;
  --toggle-border: 1px solid transparent;
  --send-off: #c9d1f6;
  --send-off-fg: #ffffff;
  --input-shadow: 0 4px 24px rgba(31, 35, 41, 0.07);
  --input-shadow-focus: 0 4px 28px rgba(61, 90, 254, 0.12);
}
[data-theme="dark"] {
  --bg-primary: #1f2023;
  --bg-secondary: #26272b;
  --bg-tertiary: #2c2d32;
  --bg-sidebar: #18191c;
  --bg-input: #2b2c31;
  --bg-message-user: #2f3550;
  --bg-message-ai: #1f2023;
  --bg-hover: rgba(255, 255, 255, 0.06);
  --bg-active: rgba(61, 90, 254, 0.2);
  --bg-newchat: transparent;
  --bg-newchat-hover: rgba(124, 146, 255, 0.12);
  --bg-toggle-on: rgba(61, 90, 254, 0.24);
  --text-primary: #f2f4f8;
  --text-secondary: #dfe2e8;
  --text-tertiary: #8e939c;
  --text-user: #f2f4f8;
  --text-on-accent-soft: #a9b8ff;
  --border-primary: #33353b;
  --border-secondary: #44464d;
  --border-focus: #5c74ff;
  --accent: #5c74ff;
  --accent-hover: #4a63f5;
  --accent-soft: rgba(92, 116, 255, 0.14);
  --sb-border: 1px solid #26272b;
  --newchat-border: 1.5px solid #5c74ff;
  --search-bg: #232428;
  --search-border: 1px solid transparent;
  --toggle-bg: #34353b;
  --toggle-border: 1px solid transparent;
  --send-off: #3d3f47;
  --send-off-fg: #7d818a;
  --input-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --input-shadow-focus: 0 4px 28px rgba(0, 0, 0, 0.45);
}
body { font-family: var(--font-sans); font-size: 16px; }
.message-content code, pre[class*="language-"], code[class*="language-"], .code-block-lang { font-family: var(--font-mono) !important; }

.sidebar { width: var(--sb-w); min-width: var(--sb-w); border-right: var(--sb-border); }
body.sidebar-collapsed .sidebar { margin-left: calc(-1 * var(--sb-w)); }
.sidebar-header { border-bottom: none; padding: 14px 12px 8px 16px; justify-content: space-between; }
.dlg-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--accent); font-size: 20px; font-weight: 700; letter-spacing: -0.02em; min-width: 0; }
.dlg-brand svg { width: 28px; height: 28px; flex-shrink: 0; }
.collapse-sidebar-btn { background: transparent; border: none; width: 34px; height: 34px; }
.collapse-sidebar-btn:hover { transform: none; background: var(--bg-hover); color: var(--text-primary); }
.dlg-actions { padding: 6px 12px 8px; display: flex; flex-direction: column; gap: 8px; }
.dlg-actions .new-chat-btn { flex: none; width: 100%; height: 40px; padding: 0 14px; box-shadow: none; font-size: 14px; border-radius: var(--r-newchat); background: var(--bg-newchat); color: var(--text-on-accent-soft); border: var(--newchat-border); justify-content: var(--newchat-align); }
.dlg-actions .new-chat-btn::before { display: none; }
.dlg-actions .new-chat-btn:hover { transform: none; box-shadow: none; background: var(--bg-newchat-hover); }
.dlg-find { position: relative; }
.dlg-find svg { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); width: 15px; height: 15px; color: var(--text-tertiary); pointer-events: none; }
.dlg-find input { width: 100%; height: 36px; padding: 0 10px 0 33px; border: var(--search-border); border-radius: var(--r-search); background: var(--search-bg); color: var(--text-primary); font: inherit; font-size: 13.5px; outline: none; -webkit-appearance: none; appearance: none; }
.dlg-find input:focus { border-color: var(--accent); }
.chat-history { padding: 4px 10px 12px; }
.chat-history-title { text-transform: none; letter-spacing: 0; font-size: 12px; font-weight: 500; padding: 12px 10px 6px; margin-top: 0 !important; color: var(--text-tertiary); }
.dlg-noresults { padding: 16px 10px; font-size: 13px; color: var(--text-tertiary); }
.chat-item { padding: 8px 10px; border-radius: var(--r-item); }
.chat-item.active { background: var(--bg-active); }
.chat-item-title { color: var(--text-primary); }
@media (hover: none) { .delete-chat { opacity: 0.55; } }
.sidebar-footer { border-top: none; padding: 8px 10px 12px; }
.dlg-frow { display: flex; gap: 4px; align-items: center; }
.dlg-frow .settings-btn { flex: 1; }
.dlg-theme { width: 40px; height: 40px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; border: none; background: transparent; color: var(--text-secondary); border-radius: 8px; cursor: pointer; }
.dlg-theme:hover { background: var(--bg-hover); }
.dlg-theme svg { width: 18px; height: 18px; }
.dlg-theme .dlg-sun { display: none; }
[data-theme="dark"] .dlg-theme .dlg-sun { display: block; }
[data-theme="dark"] .dlg-theme .dlg-moon { display: none; }

.main-content { position: relative; height: 100dvh; }
.chat-header { height: 52px; padding: 0 16px; gap: 10px; }
.chat-header > div:first-child { min-width: 0; }
.dlg-hnew { display: none; width: 36px; height: 36px; align-items: center; justify-content: center; border: none; background: transparent; color: var(--text-secondary); border-radius: 8px; cursor: pointer; flex-shrink: 0; }
.dlg-hnew:hover { background: var(--bg-hover); }
.dlg-hnew svg { width: 20px; height: 20px; }
.toggle-sidebar { border: none; width: 36px; height: 36px; }

.messages-container { padding: 16px 20px 24px; gap: var(--msg-gap); }
.message { max-width: var(--msg-w); }
.message-content { font-size: 16px; line-height: 1.75; color: var(--text-primary); overflow-wrap: anywhere; }
.message.user .message-content { background: var(--bg-message-user); color: var(--text-user); border-radius: var(--r-bubble); padding: 10px 16px; max-width: 80%; white-space: pre-wrap; box-shadow: none; }
.message.ai .message-content { padding: 2px 0 0; background: transparent; border: none; box-shadow: none; }
.message.ai:last-child .message-actions { opacity: 1; }
.message-actions { margin-top: 6px; }
.msg-action-btn { width: 30px; height: 30px; }
.message-content p { margin: 0 0 14px; }
.message-content p:last-child { margin-bottom: 0; }
.message-content ul { list-style: disc; }
.message-content ol { list-style: decimal; }
.message-content li > p { margin: 0; }
.message-content li > ul, .message-content li > ol { margin: 4px 0; }
.message-content h4, .message-content h5, .message-content h6 { color: var(--text-primary); margin: 16px 0 8px; font-size: 1em; font-weight: 600; }
.message-content blockquote { border-left: 3px solid var(--border-secondary); background: transparent; border-radius: 0; color: var(--text-tertiary); padding: 2px 0 2px 14px; margin: 10px 0; }
.message-content code:not([class*="language-"]):not(pre code) { color: var(--text-primary); background: var(--bg-tertiary); }
.message-content img { max-width: 100%; border-radius: 10px; cursor: zoom-in; }
.dlg-tbl { overflow-x: auto; margin: 14px 0; border: 1px solid var(--border-primary); border-radius: var(--r-table); }
.dlg-tbl table { border-collapse: collapse; width: 100%; font-size: 14.5px; line-height: 1.55; margin: 0; border: none; }
.dlg-tbl th, .dlg-tbl td { padding: 9px 14px; border: none; border-bottom: 1px solid var(--border-primary); text-align: left; vertical-align: top; }
.dlg-tbl th { background: var(--bg-tertiary); font-weight: 600; color: var(--text-primary); white-space: nowrap; }
.dlg-tbl tr:last-child td { border-bottom: none; }
.dlg-tbl td + td, .dlg-tbl th + th { border-left: 1px solid var(--border-primary); }
.dlg-mblock { overflow-x: auto; margin: 12px 0; text-align: center; }
.dlg-mraw { font-family: var(--font-mono); font-size: 0.9em; color: var(--text-tertiary); }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.thinking-content { background: transparent; border-left: 2px solid var(--border-secondary); border-radius: 0; padding: 0 0 0 14px; margin: 4px 0 12px 13px; white-space: pre-wrap; }
.thinking-icon { background: transparent; }
.thinking-icon svg { color: var(--accent); }
.dlg-err { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--text-secondary); }
.dlg-err button { border: 1px solid var(--border-secondary); background: transparent; color: var(--text-primary); border-radius: 16px; padding: 5px 14px; font: inherit; font-size: 13px; cursor: pointer; }
.dlg-err button:hover { background: var(--bg-hover); }
.dlg-stopped { display: block; margin-top: 8px; font-size: 13px; color: var(--text-tertiary); }

.scroll-to-bottom { position: absolute; bottom: 150px; }
.input-container { padding: 4px 20px calc(14px + env(safe-area-inset-bottom)); background: transparent; border: none; }
.input-wrapper { flex-direction: column; align-items: stretch; gap: 6px; max-width: var(--msg-w); margin: 0 auto; border-radius: var(--r-input); padding: 12px 12px 10px 16px; background: var(--bg-input); border: 1px solid var(--border-primary); box-shadow: var(--input-shadow); }
.input-wrapper:focus-within { border-color: var(--border-secondary); box-shadow: var(--input-shadow-focus); }
.input-field { font-size: 16px; min-height: 28px; padding: 2px 0 4px; background: transparent; }
.input-wrapper .input-actions { max-width: none; margin: 0; gap: 8px; padding: 0; display: flex; align-items: center; }
.dlg-spacer { flex: 1; }
.input-toggle { height: 32px; padding: 0 12px; border-radius: var(--r-toggle); background: var(--toggle-bg); border: var(--toggle-border); color: var(--text-primary); font-size: 13px; }
.input-toggle:hover { background: var(--bg-hover); }
.input-toggle.active { background: var(--bg-toggle-on); border-color: var(--accent); color: var(--text-on-accent-soft); }
.input-toggle .toggle-cost { opacity: 0.55; }
.attach-btn { width: 34px; height: 34px; background: transparent; border: none; color: var(--text-tertiary); }
.attach-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.attach-btn svg { width: 19px; height: 19px; }
.send-button { width: 34px; height: 34px; border-radius: var(--r-send); background: var(--accent); color: #fff; flex-shrink: 0; }
.send-button svg { width: 18px; height: 18px; }
.send-button:disabled { opacity: 1; background: var(--send-off); color: var(--send-off-fg); cursor: default; }
.send-button:hover:not(:disabled) { transform: none; background: var(--accent-hover); }
.send-button .dlg-istop { display: none; }
.send-button.dlg-stop .dlg-isend { display: none; }
.send-button.dlg-stop .dlg-istop { display: block; }
.attached-files { max-width: var(--msg-w); margin-left: auto; margin-right: auto; }

.welcome-message { padding: 24px 16px 20px; max-width: 760px; }
.dlg-wtitle { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 8px; }
.dlg-wtitle svg { width: var(--logo-w); height: var(--logo-w); flex-shrink: 0; }
.welcome-message h2 { font-size: 26px; font-weight: 600; margin: 0; }
.welcome-message p { font-size: 15px; }

.main-content.dlg-empty .messages-container { flex: 1 1 0; min-height: 0; justify-content: safe flex-end; overflow-y: auto; padding-bottom: 8px; }
.main-content.dlg-empty .welcome-message { margin: 0 auto; }
.main-content.dlg-empty::after { content: ''; flex: 1 1 0; }
.main-content.dlg-empty .scroll-to-bottom { display: none; }

#aiart-top-banner, #top-promo-banner, #chatBotBar { position: relative !important; z-index: 5 !important; flex-shrink: 0; animation: none !important; }
#aiart-top-banner[style*="block"] ~ #top-promo-banner { display: none !important; }
#aiart-top-banner, #top-promo-banner { background: var(--bg-secondary) !important; border-bottom: 1px solid var(--border-primary) !important; box-shadow: none !important; }
.aiart-top-title, .top-promo-title { color: var(--text-primary) !important; font-family: var(--font-sans) !important; }
.aiart-top-sub, .top-promo-sub { color: var(--text-tertiary) !important; font-family: var(--font-sans) !important; }
@media (min-width: 769px) {
    .aiart-top-inner, .top-promo-inner { min-height: 0 !important; padding: 10px 16px !important; }
    .aiart-top-title, .top-promo-title { font-size: 17px !important; }
    .aiart-top-sub, .top-promo-sub { font-size: 13.5px !important; }
    .aiart-top-btn, .top-promo-btn { padding: 10px 18px !important; font-size: 14px !important; }
}

@media (max-width: 768px) {
    .dlg-hnew { display: flex; }
    .chat-header { padding: 0 8px; }
    .messages-container { padding: 12px 14px 20px; }
    .input-container { padding: 4px 10px calc(10px + env(safe-area-inset-bottom)); }
    .input-wrapper { padding: 10px 10px 8px 14px; }
    .input-toggle { padding: 0 10px; }
    .input-toggle .toggle-cost { display: none; }
    .main-content.dlg-empty::after { display: none; }
    .main-content.dlg-empty .messages-container { justify-content: safe center; }
    .welcome-message h2 { font-size: 21px; }
    .aiart-top-inner, .top-promo-inner { flex-direction: row !important; align-items: center !important; gap: 10px !important; padding: 8px 40px 8px 12px !important; }
    .aiart-top-sub, .top-promo-sub { display: none !important; }
    .aiart-top-title, .top-promo-title { font-size: 14px !important; }
    .aiart-top-text, .top-promo-text { flex: 1; min-width: 0; }
    .aiart-top-btn, .top-promo-btn { padding: 8px 12px !important; font-size: 12.5px !important; }
    .top-promo-btns { flex-wrap: wrap; gap: 6px !important; }
    #aiart-top-close, #top-promo-close { top: 50% !important; transform: translateY(-50%); right: 8px !important; padding: 5px !important; }
}
@media (max-width: 600px) {
    .chat-title { display: none; }
    .limit-display { padding: 5px 9px; font-size: 12px; }
    .header-actions { gap: 4px; }
}

.dlg-wtitle { flex-direction: column; gap: 14px; margin-bottom: 10px; }
.dlg-wtitle svg { border-radius: 16px; box-shadow: 0 6px 20px rgba(61, 90, 254, 0.25); }
.welcome-message h2 { font-size: 28px; letter-spacing: -0.02em; }
.mode-tabs { margin: 18px auto 0; }
.suggestions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; max-width: 640px; margin: 18px auto 0; }
.suggestion-chip { padding: 12px 14px; border-radius: 14px; background: var(--bg-secondary); border: 1px solid var(--border-primary); text-align: left; box-shadow: none; }
.suggestion-chip:hover { transform: none; box-shadow: none; border-color: var(--accent); background: var(--bg-secondary); }
.suggestion-title { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.suggestion-title svg { color: var(--accent); }
.suggestion-desc { font-size: 12.5px; color: var(--text-tertiary); }
.main-content.dlg-empty::after { display: none; }
.main-content.dlg-empty .messages-container { justify-content: safe center; }
.message.user { flex-direction: row-reverse; align-items: flex-end; gap: 6px; }
.message.user .message-actions { margin: 0 0 4px; flex-shrink: 0; }
.thinking-header { border-radius: 10px; }
.code-block-wrapper { border-radius: 10px; }
.dlg-brand span { color: var(--text-primary); font-size: 17px; font-weight: 650; }
.dlg-brand span b { color: var(--accent); font-weight: 700; }
@media (max-width: 768px) {
    .suggestions { gap: 8px; margin-top: 14px; }
    .suggestion-desc { display: none; }
    .suggestion-chip { padding: 10px 12px; border-radius: 12px; }
    .suggestion-title { font-size: 13px; gap: 6px; }
    .suggestion-title svg { width: 16px; height: 16px; flex-shrink: 0; }
    .mode-tabs { margin-top: 14px; }
    .welcome-message { padding: 12px 4px; }
    .message.user { flex-direction: column; align-items: stretch; gap: 0; }
    .message.user .message-actions { margin: 4px 0 0; }
    .dlg-wtitle { gap: 10px; }
    .dlg-wtitle svg { width: 46px; height: 46px; border-radius: 13px; }
}