/* ============================================
   爆款短视频大师 - DeepSeek 风格 UI
   布局：窄侧边栏 + 居中对话
   主题：light/dark 明暗 + 5 套皮肤配色
   ============================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* ---------- 基础变量（中性色随明暗变化） ---------- */
:root {
  --primary: #4d6bfe;
  --primary2: #6e5bff;
  --primary-soft: rgba(77, 107, 254, .10);
  --primary-grad: linear-gradient(135deg, #4d6bfe 0%, #6e5bff 100%);
  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.05);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.12);
}
[data-theme="light"] {
  --bg: #ffffff;
  --bg2: #f7f7f8;
  --panel: #ffffff;
  --panel2: #f2f3f5;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #1a1a1a;
  --dim: #71717a;
  --code-bg: #f4f4f5;
  --overlay: rgba(255,255,255,.7);
}
[data-theme="dark"] {
  --bg: #1b1d21;
  --bg2: #202226;
  --panel: #2b2d31;
  --panel2: #34373d;
  --border: #3a3d43;
  --border-strong: #4a4e55;
  --text: #ececec;
  --dim: #9ca0a8;
  --code-bg: #24262b;
  --overlay: rgba(20,21,24,.75);
}
[data-theme="light"] .chat-bg { background: radial-gradient(ellipse at 50% -20%, #eef1ff 0%, transparent 60%); }
[data-theme="dark"] .chat-bg { background: radial-gradient(ellipse at 50% -20%, rgba(77,107,254,.08) 0%, transparent 60%); }

/* ---------- 皮肤（主色） ---------- */
[data-skin="blue"]   { --primary: #4d6bfe; --primary2: #6e5bff; --primary-soft: rgba(77,107,254,.10); --primary-grad: linear-gradient(135deg,#4d6bfe,#6e5bff); }
[data-skin="red"]    { --primary: #fe2c55; --primary2: #ff6b6b; --primary-soft: rgba(254,44,85,.10);  --primary-grad: linear-gradient(135deg,#fe2c55,#ff8a5c); }
[data-skin="green"]  { --primary: #10b981; --primary2: #34d399; --primary-soft: rgba(16,185,129,.10); --primary-grad: linear-gradient(135deg,#10b981,#34d399); }
[data-skin="orange"] { --primary: #f97316; --primary2: #fbbf24; --primary-soft: rgba(249,115,22,.10);  --primary-grad: linear-gradient(135deg,#f97316,#fbbf24); }
[data-skin="purple"] { --primary: #8b5cf6; --primary2: #a78bfa; --primary-soft: rgba(139,92,246,.10);  --primary-grad: linear-gradient(135deg,#8b5cf6,#a78bfa); }
[data-theme="dark"][data-skin="blue"]   { --primary: #7c8cff; --primary2: #9d8bff; --primary-soft: rgba(124,140,255,.15); --primary-grad: linear-gradient(135deg,#7c8cff,#9d8bff); }
[data-theme="dark"][data-skin="red"]    { --primary: #ff5c7a; --primary2: #ff8a5c; --primary-soft: rgba(255,92,122,.15); --primary-grad: linear-gradient(135deg,#ff5c7a,#ff8a5c); }
[data-theme="dark"][data-skin="green"]  { --primary: #34d399; --primary2: #6ee7b7; --primary-soft: rgba(52,211,153,.15); --primary-grad: linear-gradient(135deg,#34d399,#6ee7b7); }
[data-theme="dark"][data-skin="orange"] { --primary: #fb923c; --primary2: #fcd34d; --primary-soft: rgba(251,146,60,.15); --primary-grad: linear-gradient(135deg,#fb923c,#fcd34d); }
[data-theme="dark"][data-skin="purple"] { --primary: #a78bfa; --primary2: #c4b5fd; --primary-soft: rgba(167,139,250,.15); --primary-grad: linear-gradient(135deg,#a78bfa,#c4b5fd); }

html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ========== 布局 ========== */
.app { display: flex; height: 100vh; height: 100dvh; }

/* ========== 移动端顶栏 / 抽屉遮罩（默认隐藏，仅手机显示） ========== */
.mobile-topbar { display: none; }
.sidebar-backdrop { display: none; }

/* ========== 侧边栏（窄） ========== */
.sidebar {
  width: 248px; min-width: 248px;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  padding: 14px 12px;
}
.logo { display: flex; align-items: center; gap: 10px; padding: 6px 8px 14px; }
.logo-icon {
  width: 38px; height: 38px; border-radius: 12px;
  background: var(--primary-grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; color: #fff;
  box-shadow: 0 4px 14px var(--primary-soft);
  flex-shrink: 0;
}
.logo-title { font-size: 14.5px; font-weight: 700; letter-spacing: .2px; }
.logo-sub { font-size: 10px; color: var(--dim); margin-top: 1px; }

/* 新对话按钮 */
.btn-new {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--panel); border: 1px solid var(--border);
  color: var(--text); font-size: 13px; font-weight: 600;
  padding: 10px 0; border-radius: 12px; cursor: pointer;
  transition: all .2s; font-family: inherit;
}
.btn-new:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }

/* 会话列表 */
.section-label {
  font-size: 11px; color: var(--dim); letter-spacing: .5px;
  margin: 16px 8px 6px; user-select: none;
}
.session-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.session-list::-webkit-scrollbar { width: 4px; }
.session-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.session-item {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 10px; border-radius: 10px; cursor: pointer;
  font-size: 12.5px; color: var(--dim);
  transition: background .15s;
}
.session-item:hover { background: var(--panel); color: var(--text); }
.session-item.active { background: var(--panel); color: var(--text); font-weight: 600; box-shadow: var(--shadow); }
.session-item .s-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-item .s-del {
  opacity: 0; border: none; background: none; color: var(--dim);
  cursor: pointer; font-size: 12px; padding: 0 2px; transition: opacity .15s;
}
.session-item:hover .s-del { opacity: 1; }
.session-item .s-del:hover { color: var(--primary); }

/* 侧边栏底部 */
.sidebar-foot { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.ai-status-btn {
  display: flex; align-items: center; gap: 8px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 9px 11px; cursor: pointer;
  color: var(--text); font-size: 12px; text-align: left; width: 100%;
  transition: all .2s; font-family: inherit;
}
.ai-status-btn:hover { border-color: var(--primary); }
.ai-status-dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; box-shadow: 0 0 6px rgba(52,211,153,.6); flex-shrink: 0; }
.ai-status-dot.off { background: #f87171; box-shadow: 0 0 6px rgba(248,113,113,.5); }
.ai-status-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 11.5px; }
.ai-status-edit { font-size: 11px; color: var(--dim); flex-shrink: 0; }
.kb-fixed {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 12px;
  font-size: 10.5px; color: var(--dim); line-height: 1.7;
}
.kb-fixed b { color: var(--primary); }

/* ========== 主区 ========== */
.chat-area { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.chat-bg { position: absolute; inset: 0; pointer-events: none; }

/* 顶部栏 */
.chat-header {
  position: relative; z-index: 2;
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px;
}
.mode-tabs { display: flex; gap: 4px; background: var(--panel2); padding: 4px; border-radius: 12px; }
.mode-tab {
  border: none; background: transparent; color: var(--dim);
  font-size: 13px; font-weight: 600; padding: 7px 18px;
  border-radius: 9px; cursor: pointer; transition: all .2s; font-family: inherit;
}
.mode-tab:hover { color: var(--text); }
.mode-tab.active { background: var(--panel); color: var(--text); box-shadow: var(--shadow); }
.chat-header-right { display: flex; align-items: center; gap: 10px; }
.chat-status { font-size: 11.5px; color: var(--dim); display: flex; align-items: center; gap: 6px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: #34d399; }
.chat-status.busy .dot { background: var(--primary); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.theme-btn {
  background: none; border: 1px solid var(--border); color: var(--dim);
  width: 34px; height: 34px; border-radius: 10px; cursor: pointer;
  font-size: 15px; transition: all .2s; flex-shrink: 0;
}
.theme-btn:hover { border-color: var(--primary); color: var(--primary); }
.theme-btn.auto { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }

/* ========== 对话区 ========== */
.chat-messages {
  position: relative; z-index: 1;
  flex: 1; overflow-y: auto; padding: 8px 20px 12px;
  display: flex; flex-direction: column;
}
.chat-messages::-webkit-scrollbar { width: 5px; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.chat-inner { width: 100%; max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; padding-bottom: 12px; }

.msg { display: flex; gap: 12px; }
.msg.bot { align-items: flex-start; }
.msg.user { flex-direction: row-reverse; align-items: flex-start; }
.avatar {
  width: 32px; height: 32px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 16px;
  background: var(--primary-grad); color: #fff; box-shadow: 0 2px 10px var(--primary-soft);
}
.msg.user .avatar { background: var(--panel2); box-shadow: none; }
.bubble {
  max-width: 88%; padding: 12px 16px;
  font-size: 14px; line-height: 1.75;
  position: relative;
}
.msg.bot .bubble { background: var(--panel); border: 1px solid var(--border); border-radius: 4px 16px 16px 16px; box-shadow: var(--shadow); }
.msg.user .bubble { background: var(--primary-soft); border: 1px solid transparent; border-radius: 16px 4px 16px 16px; }
.bubble-name { font-size: 11px; font-weight: 700; color: var(--primary); margin-bottom: 5px; }
.msg.user .bubble-name { color: var(--dim); text-align: right; }
.bubble-text { word-break: break-word; white-space: pre-wrap; }
.bubble-text b { color: var(--primary); font-weight: 700; }
.bubble-text code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 5px; padding: 1px 5px; font-size: 12.5px; }
.bubble-text h1, .bubble-text h2, .bubble-text h3 { margin: 10px 0 6px; color: var(--text); }
.bubble-text h1 { font-size: 16px; } .bubble-text h2 { font-size: 15px; } .bubble-text h3 { font-size: 14px; }
.bubble-text ul, .bubble-text ol { padding-left: 20px; margin: 5px 0; }
.bubble-text li { margin: 2px 0; }
.bubble-text blockquote { border-left: 3px solid var(--primary); padding-left: 10px; color: var(--dim); margin: 7px 0; font-style: italic; }
.bubble-text table { border-collapse: collapse; margin: 7px 0; font-size: 12.5px; }
.bubble-text th, .bubble-text td { border: 1px solid var(--border); padding: 4px 10px; }
.bubble-text th { background: var(--panel2); }
.bubble-text hr { border: none; border-top: 1px solid var(--border); margin: 10px 0; }
.bubble-text p { margin: 5px 0; }

/* 成品文案卡片 */
.final-card {
  border: 1.5px solid var(--primary);
  border-radius: 14px; padding: 14px 16px; margin: 6px 0;
  background: var(--primary-soft);
}
.final-label { display: flex; justify-content: space-between; align-items: center; font-size: 12px; font-weight: 800; color: var(--primary); margin-bottom: 9px; }
.final-text { font-size: 15px; line-height: 1.9; white-space: pre-wrap; }
.copy-btn {
  background: var(--primary); color: #fff; border: none;
  font-size: 11px; font-weight: 700; padding: 5px 14px;
  border-radius: 20px; cursor: pointer; transition: all .2s; font-family: inherit;
}
.copy-btn:hover { opacity: .88; transform: translateY(-1px); }
.copy-btn.ok { background: #34d399; }

/* 折叠说明 */
.reason-box { background: var(--panel2); border: 1px solid var(--border); border-radius: 12px; margin-top: 10px; overflow: hidden; }
.reason-box summary { cursor: pointer; font-size: 12px; color: var(--dim); padding: 10px 14px; list-style: none; user-select: none; display: flex; align-items: center; gap: 6px; }
.reason-box summary::-webkit-details-marker { display: none; }
.reason-box summary::before { content: "▸"; transition: transform .2s; color: var(--primary); }
.reason-box[open] summary::before { transform: rotate(90deg); }
.reason-box .reason-body { padding: 10px 14px 12px; font-size: 12.5px; color: var(--dim); line-height: 1.8; border-top: 1px dashed var(--border); }

/* 消息复制按钮 */
.msg-copy {
  position: absolute; top: -8px; right: -8px;
  background: var(--panel); border: 1px solid var(--border);
  color: var(--dim); font-size: 10px; padding: 3px 9px;
  border-radius: 10px; cursor: pointer; opacity: 0;
  transition: all .2s; box-shadow: var(--shadow); z-index: 5;
}
.bubble:hover .msg-copy { opacity: 1; }
.msg-copy:hover { color: var(--primary); border-color: var(--primary); }
.msg-copy.ok { color: #34d399; border-color: #34d399; }

/* 打字动画 */
.typing .bubble-text::after { content: "▊"; animation: blink 1s infinite; color: var(--primary); }
@keyframes blink { 50% { opacity: 0; } }

/* ========== 欢迎页 ========== */
.welcome {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 20px; text-align: center;
}
.welcome-logo {
  width: 68px; height: 68px; border-radius: 22px;
  background: var(--primary-grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 34px; color: #fff;
  box-shadow: 0 12px 40px var(--primary-soft);
  margin-bottom: 20px;
  animation: float 4s ease-in-out infinite;
}
@keyframes float { 50% { transform: translateY(-6px); } }
.welcome-title { font-size: 26px; font-weight: 800; letter-spacing: .5px; }
.welcome-sub { font-size: 13.5px; color: var(--dim); margin-top: 10px; line-height: 1.7; }
.welcome-cards { display: flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; justify-content: center; }
.welcome-card {
  width: 180px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 16px; padding: 18px 16px; cursor: pointer;
  text-align: left; transition: all .2s; box-shadow: var(--shadow);
}
.welcome-card:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: var(--shadow-lg); }
.welcome-card .wc-ico { font-size: 26px; }
.welcome-card .wc-name { font-size: 14px; font-weight: 700; margin-top: 10px; }
.welcome-card .wc-desc { font-size: 11.5px; color: var(--dim); margin-top: 5px; line-height: 1.6; }
.welcome-card .wc-go { font-size: 11px; color: var(--primary); margin-top: 12px; font-weight: 600; display: none; }
.welcome-card:hover .wc-go { display: block; }

/* ========== 输入区 ========== */
.chat-input-area {
  position: relative; z-index: 2;
  padding: 8px 20px 22px;
}
.input-wrap {
  width: 100%; max-width: 780px; margin: 0 auto;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 24px; padding: 10px 12px 10px 18px;
  box-shadow: var(--shadow-lg);
  transition: border-color .2s, box-shadow .2s;
  display: flex; align-items: flex-end; gap: 8px;
}
.input-wrap:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft), var(--shadow-lg); }
#inputBox {
  flex: 1; border: none; outline: none; resize: none;
  background: transparent; color: var(--text);
  font-size: 14.5px; line-height: 1.6; font-family: inherit;
  min-height: 26px; max-height: 150px;
}
#inputBox::placeholder { color: var(--dim); }
.send-btn {
  width: 38px; height: 38px; border-radius: 50%; border: none;
  background: var(--primary-grad); color: #fff;
  font-size: 16px; cursor: pointer; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all .2s; box-shadow: 0 4px 12px var(--primary-soft);
}
.send-btn:hover { transform: translateY(-1px) scale(1.04); }
.send-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.input-toolbar {
  width: 100%; max-width: 780px; margin: 8px auto 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 6px;
}
.tool-btn {
  background: none; border: 1px solid var(--border); color: var(--dim);
  font-size: 11.5px; padding: 5px 13px; border-radius: 20px; cursor: pointer;
  transition: all .2s; font-family: inherit;
}
.tool-btn:hover { color: var(--text); border-color: var(--primary); }
.send-hint { font-size: 11px; color: var(--dim); }

/* ========== 设置面板 ========== */
.settings-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: var(--overlay); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
}
.settings-panel {
  width: 640px; max-width: 94vw; max-height: 88vh;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 20px; display: flex; flex-direction: column;
  box-shadow: var(--shadow-lg);
}
.settings-header { display: flex; justify-content: space-between; align-items: center; padding: 20px 24px; border-bottom: 1px solid var(--border); }
.settings-title { font-size: 17px; font-weight: 800; }
.settings-sub { font-size: 11.5px; color: var(--dim); margin-top: 3px; }
.settings-close {
  background: none; border: 1px solid var(--border); color: var(--dim);
  width: 32px; height: 32px; border-radius: 50%; cursor: pointer; font-size: 14px;
  transition: all .2s;
}
.settings-close:hover { color: var(--text); border-color: var(--primary); }
.settings-body { padding: 20px 24px 24px; overflow-y: auto; }
.settings-body::-webkit-scrollbar { width: 6px; }
.settings-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* 外观区块 */
.appearance-block { background: var(--panel2); border: 1px solid var(--border); border-radius: 14px; padding: 16px; margin-bottom: 18px; }
.appearance-block .ab-title { font-size: 13px; font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; gap: 6px; }
.theme-modes { display: flex; gap: 6px; margin-bottom: 14px; }
.theme-mode-btn {
  flex: 1; background: var(--panel); border: 1px solid var(--border);
  color: var(--dim); font-size: 12px; font-weight: 600; padding: 8px 0;
  border-radius: 10px; cursor: pointer; transition: all .2s; font-family: inherit;
}
.theme-mode-btn:hover { color: var(--text); }
.theme-mode-btn.active { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.skin-row { display: flex; align-items: center; gap: 12px; }
.skin-label { font-size: 12px; color: var(--dim); }
.skin-list { display: flex; gap: 10px; }
.skin-dot {
  width: 30px; height: 30px; border-radius: 50%; cursor: pointer;
  border: 2px solid transparent; transition: all .2s; position: relative;
  box-shadow: 0 2px 8px rgba(0,0,0,.12);
}
.skin-dot:hover { transform: scale(1.12); }
.skin-dot.active { border-color: var(--text); transform: scale(1.12); }
.skin-dot.active::after {
  content: "✓"; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 14px; font-weight: 800;
  text-shadow: 0 1px 3px rgba(0,0,0,.4);
}
.skin-dot.blue { background: linear-gradient(135deg,#4d6bfe,#6e5bff); }
.skin-dot.red { background: linear-gradient(135deg,#fe2c55,#ff8a5c); }
.skin-dot.green { background: linear-gradient(135deg,#10b981,#34d399); }
.skin-dot.orange { background: linear-gradient(135deg,#f97316,#fbbf24); }
.skin-dot.purple { background: linear-gradient(135deg,#8b5cf6,#a78bfa); }

/* Provider 列表 */
.provider-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.provider-empty { color: var(--dim); font-size: 12px; padding: 14px; text-align: center; border: 1px dashed var(--border); border-radius: 12px; }
.provider-card {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 14px; transition: border-color .2s;
}
.provider-card.active { border-color: var(--primary); background: var(--primary-soft); }
.provider-info { flex: 1; min-width: 0; }
.provider-name { font-size: 13px; font-weight: 700; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.provider-tag { font-size: 10px; padding: 1px 8px; border-radius: 10px; background: var(--primary-soft); color: var(--primary); }
.provider-meta { font-size: 11px; color: var(--dim); margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.provider-actions { display: flex; gap: 6px; flex-shrink: 0; }
.provider-actions .tool-btn { font-size: 10.5px; padding: 4px 10px; }
.btn-default { border-color: var(--primary) !important; color: var(--primary) !important; }
.btn-del:hover { border-color: var(--primary) !important; color: var(--primary) !important; }

/* 表单 */
.provider-form { display: flex; flex-direction: column; gap: 10px; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.form-row { display: flex; align-items: center; gap: 10px; }
.form-row label { width: 128px; font-size: 12px; color: var(--dim); flex-shrink: 0; }
.form-row input, .form-row select {
  flex: 1; background: var(--bg2); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); font-size: 12.5px; padding: 9px 12px; outline: none; font-family: inherit;
  transition: border-color .2s;
}
.form-row input:focus, .form-row select:focus { border-color: var(--primary); }
.form-row select option { background: var(--bg); }
.form-actions { justify-content: flex-end; gap: 10px; margin-top: 4px; }
.btn-primary {
  background: var(--primary-grad); border: none; color: #fff; font-size: 12.5px; font-weight: 700;
  padding: 9px 20px; border-radius: 20px; cursor: pointer; transition: all .2s; font-family: inherit;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 14px var(--primary-soft); }
.pf-test-result { font-size: 11px; color: var(--dim); max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pf-test-result.ok { color: #34d399; }
.pf-test-result.fail { color: #f87171; }
.settings-tips { font-size: 11px; color: var(--dim); line-height: 1.9; margin-top: 16px; padding: 13px; background: var(--panel2); border-radius: 12px; }
.settings-tips code { background: var(--bg); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; font-size: 10px; }

/* 加载遮罩 */
.loading-overlay {
  position: fixed; inset: 0; z-index: 400;
  background: var(--overlay); backdrop-filter: blur(4px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
}
.spinner { width: 40px; height: 40px; border-radius: 50%; border: 3px solid var(--border); border-top-color: var(--primary); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; color: var(--dim); }

/* ========== 响应式（手机/平板）：抽屉式侧边栏 + 顶栏 + 全屏设置 ========== */
@media (max-width: 860px) {
  * { -webkit-tap-highlight-color: transparent; }
  .mode-tab, .tool-btn, .send-btn, .theme-btn, .btn-primary, .copy-btn, .m-menu-btn, .m-settings-btn { touch-action: manipulation; }

  /* 顶栏（汉堡菜单 + 标题 + 设置） */
  .mobile-topbar {
    display: flex; align-items: center; gap: 10px;
    flex-shrink: 0; position: relative; z-index: 150;
    padding: 6px 12px;
    padding-top: calc(6px + env(safe-area-inset-top));
    background: var(--bg2); border-bottom: 1px solid var(--border);
  }
  .m-menu-btn, .m-settings-btn {
    width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
    background: var(--panel); border: 1px solid var(--border);
    color: var(--text); font-size: 17px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-family: inherit; transition: all .2s;
  }
  .m-menu-btn:active, .m-settings-btn:active { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
  .m-logo {
    flex: 1; min-width: 0; font-size: 15px; font-weight: 800;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  }

  /* .app 固定定位：脱离文档流 → 页面无可滚动内容，键盘弹起时 iOS 无法把输入框顶走 */
  .app {
    flex-direction: column;
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--vvh, 100dvh);
  }

  /* 侧边栏 → 左侧抽屉 */
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 210;
    width: 82vw; max-width: 320px; min-width: 0;
    transform: translateX(-105%);
    transition: transform .25s ease;
    padding-bottom: calc(14px + env(safe-area-inset-bottom));
    border-right: none;
  }
  body.sidebar-open .sidebar { transform: translateX(0); box-shadow: 0 0 40px rgba(0,0,0,.28); }
  .sidebar-backdrop {
    display: block; position: fixed; inset: 0; z-index: 200;
    background: rgba(0,0,0,.45);
    opacity: 0; pointer-events: none; transition: opacity .25s;
  }
  body.sidebar-open .sidebar-backdrop { opacity: 1; pointer-events: auto; }

  /* 主区 */
  .chat-area { flex: 1; min-height: 0; }
  .chat-header { padding: 8px 10px; gap: 8px; }
  .mode-tabs { flex: 1; }
  .mode-tab { flex: 1; padding: 7px 2px; font-size: 12.5px; white-space: nowrap; text-align: center; }
  .chat-status { display: none; }

  .chat-messages { padding: 8px 12px 10px; }
  .chat-inner { max-width: 100%; gap: 16px; }
  .msg { gap: 8px; }
  .avatar { width: 30px; height: 30px; font-size: 15px; }
  .bubble { max-width: 86%; padding: 10px 12px; font-size: 13.5px; }
  .final-card { padding: 12px 13px; }
  .final-text { font-size: 14px; }

  /* 欢迎页 */
  .welcome { padding: 12px; }
  .welcome-logo { width: 56px; height: 56px; border-radius: 18px; font-size: 28px; margin-bottom: 14px; }
  .welcome-title { font-size: 21px; }
  .welcome-sub { font-size: 12.5px; }
  .welcome-cards { width: 100%; flex-direction: column; gap: 10px; margin-top: 22px; }
  .welcome-card { width: 100%; padding: 14px 16px; }
  .welcome-card .wc-ico { font-size: 22px; }

  /* 输入区（16px 防 iOS 聚焦缩放） */
  .chat-input-area { padding: 6px 10px calc(10px + env(safe-area-inset-bottom)); }
  .input-wrap { padding: 8px 8px 8px 14px; }
  #inputBox { font-size: 16px; max-height: 120px; }
  .send-btn { width: 36px; height: 36px; }
  .send-hint { display: none; }

  /* 设置面板 → 底部全屏抽屉（键盘弹起时高度跟随 visualViewport） */
  .settings-overlay { align-items: flex-end; height: var(--vvh, 100dvh); }
  .settings-panel {
    width: 100vw; max-width: none; max-height: 94dvh;
    border-radius: 18px 18px 0 0; border-bottom: none;
  }
  .settings-header { padding: 16px 18px; }
  .settings-body { padding: 16px 18px calc(18px + env(safe-area-inset-bottom)); }
  .theme-modes { flex-wrap: wrap; }
  .theme-mode-btn { flex: 1 1 30%; min-width: 88px; }
  .skin-row { flex-wrap: wrap; }
  .form-row { flex-direction: column; align-items: stretch; gap: 6px; }
  .form-row label { width: auto; }
  .form-actions { flex-wrap: wrap; justify-content: flex-end; }
  .provider-card { flex-wrap: wrap; }
  .provider-actions { width: 100%; justify-content: flex-end; }
  .admin-login { flex-wrap: wrap; }
}