/* ===== 智达 AI Studio — Gemini 风格深色主题 ===== */
:root{
  --bg:#131314;
  --surface:#1e1f20;
  --surface-2:#282a2c;
  --surface-3:#343538;
  --border:#444746;
  --border-soft:#2d2e30;
  --text:#e3e3e3;
  --text-dim:#9aa0a6;
  --text-faint:#80868b;
  --accent:#a8c7fa;
  --accent-strong:#8ab4f8;
  --accent-ink:#062e6f;
  --danger:#f28b82;
  --green:#81c995;
  --yellow:#fdd663;
  --radius:28px;
  --radius-sm:12px;
  --shadow:0 2px 8px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:"Google Sans","Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:inherit;cursor:pointer}
.hidden{display:none !important}

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

/* ===== 侧边栏 ===== */
.sidebar{
  width:260px;flex-shrink:0;background:var(--bg);
  border-right:1px solid var(--border-soft);
  display:flex;flex-direction:column;transition:margin-left .25s ease;
}
.sidebar.collapsed{margin-left:-260px}
.sidebar-head{padding:12px;display:flex;gap:8px}
.btn-new{
  flex:1;display:flex;align-items:center;gap:8px;justify-content:center;
  background:var(--surface);color:var(--text);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:10px;font-size:.9rem;transition:.15s;
}
.btn-new:hover{background:var(--surface-2)}
.icon-btn{
  background:transparent;border:none;color:var(--text-dim);font-size:1.1rem;
  padding:8px;border-radius:50%;width:40px;height:40px;
}
.icon-btn:hover{background:var(--surface-2);color:var(--text)}
.chat-list{flex:1;overflow-y:auto;padding:4px 8px}
.chat-item{
  padding:10px 12px;border-radius:var(--radius-sm);color:var(--text-dim);
  font-size:.88rem;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  display:flex;align-items:center;gap:8px;
}
.chat-item:hover{background:var(--surface)}
.chat-item.active{background:var(--surface-2);color:var(--text)}
.chat-item .del{margin-left:auto;opacity:0;color:var(--text-faint)}
.chat-item:hover .del{opacity:1}
.sidebar-foot{padding:12px;border-top:1px solid var(--border-soft);font-size:.82rem;color:var(--text-dim);display:flex;flex-direction:column;gap:8px}
.mode-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--surface);border:1px solid var(--border);font-size:.78rem}
.mode-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--text-faint)}
.mode-badge.on .dot{background:var(--green)}
.sidebar-foot a{color:var(--text-dim)}

/* ===== 主区 ===== */
.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{
  display:flex;align-items:center;gap:12px;padding:10px 16px;
  border-bottom:1px solid var(--border-soft);
}
.model-select{position:relative}
.model-select select{
  appearance:none;background:transparent;border:1px solid var(--border);
  color:var(--text);padding:8px 32px 8px 14px;border-radius:var(--radius-sm);
  font-size:.88rem;cursor:pointer;
}
.model-select::after{
  content:"▾";position:absolute;right:12px;top:50%;transform:translateY(-50%);
  color:var(--text-dim);pointer-events:none;font-size:.7rem;
}
.model-select select:hover{background:var(--surface)}
.top-links{margin-left:auto;display:flex;gap:6px}
.top-links a{
  color:var(--text-dim);font-size:.85rem;padding:8px 14px;border-radius:var(--radius-sm);
}
.top-links a:hover{background:var(--surface);color:var(--text);text-decoration:none}

/* ===== 消息区 ===== */
.messages{flex:1;overflow-y:auto;padding:24px 0}
.messages-inner{max-width:820px;margin:0 auto;padding:0 24px}
.empty{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 24px}
.empty h1{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:500;margin:0 0 8px;letter-spacing:-.01em}
.empty p{color:var(--text-dim);font-size:1.05rem;margin:0}

.msg{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--border-soft)}
.msg.user{justify-content:flex-end}
.msg .avatar{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700}
.msg.user .avatar{background:linear-gradient(135deg,#8ab4f8,#a8c7fa);color:#062e6f}
.msg.assistant .avatar{background:linear-gradient(135deg,#81c995,#a8c7fa);color:#062e6f}
.msg .bubble{max-width:70%;line-height:1.7;font-size:.96rem}
.msg.user .bubble{background:var(--surface);padding:12px 18px;border-radius:18px}
.msg.assistant .bubble{width:100%}
.bubble p{margin:.4em 0}
.bubble pre{background:#0d1117;border:1px solid var(--border);border-radius:10px;padding:14px;overflow:auto;position:relative}
.bubble code{font-family:"JetBrains Mono",Consolas,monospace;font-size:.86rem}
.bubble :not(pre)>code{background:var(--surface-2);padding:2px 6px;border-radius:6px;font-size:.85em}
.bubble pre .copy{position:absolute;top:8px;right:8px;background:var(--surface);border:1px solid var(--border);color:var(--text-dim);font-size:.72rem;padding:3px 8px;border-radius:6px}
.bubble ul,.bubble ol{padding-left:1.4em}
.bubble table{border-collapse:collapse;margin:.5em 0}
.bubble th,.bubble td{border:1px solid var(--border);padding:6px 10px}
.thinking{color:var(--text-faint);font-style:italic}
.cursor{display:inline-block;width:8px;height:1.1em;background:var(--text);margin-left:2px;vertical-align:middle;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

/* ===== 输入区 ===== */
.composer{padding:12px 24px 18px;background:linear-gradient(to top,var(--bg) 70%,transparent)}
.composer-box{
  max-width:820px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:8px 8px 8px 20px;
}
.composer-box:focus-within{border-color:var(--text-faint)}
#input{
  flex:1;background:transparent;border:none;outline:none;resize:none;color:var(--text);
  font-size:1rem;line-height:1.5;max-height:200px;padding:10px 0;font-family:inherit;
}
.send-btn{
  background:var(--accent-strong);color:var(--accent-ink);border:none;width:40px;height:40px;
  border-radius:50%;font-size:1.2rem;flex-shrink:0;display:flex;align-items:center;justify-content:center;
  transition:.15s;
}
.send-btn:hover{background:var(--accent)}
.send-btn:disabled{opacity:.4;cursor:default}
.chips{max-width:820px;margin:10px auto 0;display:flex;gap:8px;flex-wrap:wrap}
.chip{background:transparent;border:1px solid var(--border);color:var(--text-dim);padding:6px 14px;border-radius:999px;font-size:.82rem}
.chip:hover{background:var(--surface);color:var(--text)}
.disclaimer{text-align:center;color:var(--text-faint);font-size:.74rem;margin-top:10px}

/* ===== 匿名提示条 ===== */
.banner{
  max-width:820px;margin:0 auto 8px;display:flex;align-items:center;gap:10px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:10px 16px;font-size:.84rem;color:var(--text-dim);
}
.banner a{font-weight:600}

/* ===== 账户页 ===== */
.auth-wrap{max-width:420px;margin:8vh auto;padding:0 20px}
.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:28px}
.auth-card h2{margin:0 0 4px;font-weight:600}
.auth-card .sub{color:var(--text-dim);font-size:.88rem;margin-bottom:20px}
.field{margin-bottom:14px}
.field label{display:block;font-size:.82rem;color:var(--text-dim);margin-bottom:6px}
.field input{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:10px;
  padding:11px 14px;color:var(--text);font-size:.95rem;outline:none;
}
.field input:focus{border-color:var(--accent)}
.btn-primary{
  width:100%;background:var(--accent-strong);color:var(--accent-ink);border:none;
  padding:12px;border-radius:10px;font-size:.95rem;font-weight:600;margin-top:6px;
}
.btn-primary:hover{background:var(--accent)}
.auth-switch{text-align:center;margin-top:16px;font-size:.86rem;color:var(--text-dim)}
.tabs{display:flex;gap:4px;max-width:960px;margin:0 auto;padding:14px 20px 0;border-bottom:1px solid var(--border-soft)}
.tab{padding:10px 16px;background:transparent;border:none;color:var(--text-dim);font-size:.92rem;border-bottom:2px solid transparent}
.tab.active{color:var(--text);border-bottom-color:var(--accent)}
.panel{max-width:960px;margin:0 auto;padding:24px 20px}
.panel h3{font-weight:600;margin:0 0 4px}
.panel .muted{color:var(--text-dim);font-size:.86rem;margin-bottom:18px}

.key-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:12px;display:flex;align-items:center;gap:14px}
.key-card .kname{font-weight:600}
.key-card .kval{font-family:monospace;font-size:.82rem;color:var(--text-dim);background:var(--bg);padding:6px 10px;border-radius:8px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.btn-sm{background:var(--surface-2);border:1px solid var(--border);color:var(--text);padding:7px 12px;border-radius:8px;font-size:.82rem}
.btn-sm:hover{background:var(--surface-3)}
.btn-sm.danger{color:var(--danger);border-color:transparent}
.btn-sm.danger:hover{background:rgba(242,139,130,.12)}

.usage-bar{height:14px;background:var(--surface);border-radius:999px;overflow:hidden;margin:8px 0 4px}
.usage-bar > div{height:100%;background:linear-gradient(90deg,#8ab4f8,#81c995)}
.usage-num{font-size:1.6rem;font-weight:700}
.usage-sub{color:var(--text-dim);font-size:.84rem}
.kv{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--border-soft);font-size:.9rem}
.kv span:first-child{color:var(--text-dim)}

.doc-section{margin-bottom:24px}
.doc-section h4{margin:0 0 8px;font-size:.95rem}
pre.code{background:#0d1117;border:1px solid var(--border);border-radius:10px;padding:14px;overflow:auto;position:relative;font-size:.82rem}
pre.code code{font-family:"JetBrains Mono",Consolas,monospace;color:#e3e3e3}
pre.code .copy{position:absolute;top:8px;right:8px;background:var(--surface);border:1px solid var(--border);color:var(--text-dim);font-size:.72rem;padding:3px 8px;border-radius:6px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--surface-3);color:var(--text);padding:10px 18px;border-radius:10px;box-shadow:var(--shadow);font-size:.88rem;opacity:0;transition:.2s;pointer-events:none;z-index:2000}
.toast.show{opacity:1}
.empty-hint{color:var(--text-faint);font-size:.88rem;text-align:center;padding:30px}

@media(max-width:720px){
  .sidebar{position:absolute;z-index:50;height:100%;box-shadow:var(--shadow)}
  .msg .bubble{max-width:85%}
  .top-links a{padding:8px 8px}
}