:root{
  --bg:#0b1119;
  --bg-soft:#111a25;
  --card:#152030;
  --card-2:#1b283a;
  --line:#243447;
  --txt:#e6edf6;
  --txt-2:#9fb0c4;
  --txt-3:#6b7f96;
  --brand:#4f8cff;
  --brand-2:#2f6ae4;
  --gold:#e0b356;
  --danger:#ff6b6b;
  --ok:#37d399;
  --radius:14px;
  --safe-b:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;height:100%}
body{
  background:radial-gradient(1200px 600px at 50% -10%,#16273c 0%,var(--bg) 55%) no-repeat,var(--bg);
  color:var(--txt);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  overscroll-behavior-y:none;
}
button,input,textarea,select{font-family:inherit;color:inherit}
[hidden]{display:none!important}
.auth-gate{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:28px 22px}
.auth-card{width:100%;max-width:400px;padding:34px 26px;background:var(--card);border:1px solid var(--line);border-radius:20px;text-align:center}
.auth-icon{font-size:36px;margin-bottom:16px}
.auth-card h1{font-size:21px;margin:0 0 12px}
.auth-card p{font-size:14px;color:var(--txt-2);margin:0 0 24px;line-height:1.8}
.auth-card a{display:block;font-size:14px;color:var(--brand);margin-top:18px;text-decoration:none}
.auth-card button{width:100%;padding:12px;border:0;border-radius:10px;background:var(--brand-2);color:#fff;font-size:15px;cursor:pointer}
.auth-card button:disabled{opacity:.5;cursor:default}
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-thumb{background:#2a3d54;border-radius:3px}

.app{
  max-width:520px;margin:0 auto;height:100dvh;
  display:flex;flex-direction:column;
  background:var(--bg-soft);
  box-shadow:0 0 60px rgba(0,0,0,.5);
  position:relative;
}

/* ---------- 顶部 ---------- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 14px 10px;gap:10px;
  background:linear-gradient(180deg,#16233a,#111a25);
  border-bottom:1px solid var(--line);
  padding-top:calc(14px + env(safe-area-inset-top,0px));
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-logo{
  width:38px;height:38px;flex:0 0 38px;border-radius:11px;
  display:grid;place-items:center;font-size:20px;
  background:linear-gradient(145deg,#2f6ae4,#1b3b7a);
  box-shadow:0 4px 14px rgba(79,140,255,.28);
}
.brand-txt h1{margin:0;font-size:16px;font-weight:700;letter-spacing:.5px}
.brand-txt p{margin:1px 0 0;font-size:11.5px;color:var(--txt-3)}
.topbar-actions{display:flex;gap:6px}
.icon-btn{
  width:34px;height:34px;border-radius:10px;border:1px solid var(--line);
  background:var(--card);color:var(--txt-2);font-size:16px;cursor:pointer;
  display:grid;place-items:center;transition:.18s;
}
.icon-btn:hover{color:var(--txt);border-color:#38506f;background:var(--card-2)}

/* ---------- 领域 ---------- */
.domains{
  display:flex;gap:7px;overflow-x:auto;padding:2px 12px 10px;
  scrollbar-width:none;
}
.domains::-webkit-scrollbar{display:none}
.chip{
  flex:0 0 auto;padding:7px 13px;border-radius:999px;cursor:pointer;
  border:1px solid var(--line);background:var(--card);
  font-size:12.5px;color:var(--txt-2);white-space:nowrap;transition:.18s;
}
.chip .ic{margin-right:4px}
.chip:hover{color:var(--txt)}
.chip.on{
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  border-color:transparent;color:#fff;font-weight:600;
  box-shadow:0 4px 14px rgba(79,140,255,.3);
}

/* ---------- 对话 ---------- */
.chat{
  flex:1;overflow-y:auto;overflow-x:hidden;
  padding:8px 12px 16px;
  -webkit-overflow-scrolling:touch;
}
.welcome{padding-top:6px}
.welcome-card{
  background:linear-gradient(160deg,#1a2939,#141f2e);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 15px;text-align:center;
}
.wc-icon{font-size:30px}
.welcome-card h2{margin:6px 0 6px;font-size:16px;font-weight:700}
.welcome-card p{margin:0;font-size:13px;color:var(--txt-2)}
.welcome-card strong{color:var(--gold);font-weight:600}
.wc-tips{display:flex;gap:8px;justify-content:center;margin-top:11px;flex-wrap:wrap}
.wc-tips span{font-size:11px;color:var(--txt-3);background:#0f1a26;border:1px solid var(--line);padding:4px 9px;border-radius:20px}

.quick-wrap{margin-top:16px}
.quick-title{font-size:12px;color:var(--txt-3);margin-bottom:8px;padding-left:2px}
.quick{display:flex;flex-direction:column;gap:8px}
.quick button{
  text-align:left;padding:11px 13px;border-radius:11px;cursor:pointer;
  background:var(--card);border:1px solid var(--line);color:var(--txt-2);
  font-size:13px;transition:.18s;line-height:1.5;
}
.quick button:hover{border-color:#3a5578;color:var(--txt);background:var(--card-2);transform:translateY(-1px)}

/* 消息 */
.msg{display:flex;gap:9px;margin:12px 0;animation:in .28s ease}
@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg.me{flex-direction:row-reverse}
.avatar{
  width:30px;height:30px;flex:0 0 30px;border-radius:9px;display:grid;place-items:center;
  font-size:15px;background:var(--card-2);border:1px solid var(--line);
}
.msg.me .avatar{background:linear-gradient(145deg,var(--brand),var(--brand-2));border-color:transparent}
.bubble{
  max-width:calc(100% - 44px);padding:11px 13px;border-radius:13px;
  background:var(--card);border:1px solid var(--line);
  font-size:14px;line-height:1.72;word-break:break-word;overflow-wrap:anywhere;
}
.msg.me .bubble{
  background:linear-gradient(135deg,#2f6ae4,#2557bd);border-color:transparent;color:#fff;
  border-top-right-radius:4px;
}
.msg.ai .bubble{border-top-left-radius:4px}
.bubble p{margin:0 0 8px}
.bubble p:last-child{margin-bottom:0}
.bubble ul,.bubble ol{margin:6px 0;padding-left:20px}
.bubble li{margin:3px 0}
.bubble strong{color:var(--gold);font-weight:600}
.msg.me .bubble strong{color:#ffe9b8}
.bubble h3,.bubble h4{margin:10px 0 6px;font-size:14px;color:#9cc2ff}
.bubble blockquote{
  margin:8px 0;padding:8px 11px;border-left:3px solid var(--brand);
  background:rgba(79,140,255,.08);border-radius:0 8px 8px 0;color:var(--txt-2);font-size:13px;
}
.bubble code{background:#0d1725;padding:1px 5px;border-radius:4px;font-size:12.5px;color:#f0b8b8}
.bubble pre{background:#0d1725;padding:10px;border-radius:8px;overflow-x:auto;margin:8px 0}
.bubble hr{border:none;border-top:1px solid var(--line);margin:9px 0}
.bubble table{width:100%;border-collapse:collapse;margin:8px 0;font-size:12.5px}
.bubble th,.bubble td{border:1px solid var(--line);padding:5px 7px;text-align:left}
.bubble th{background:#1a2839}

.tag{
  display:inline-block;font-size:10.5px;color:var(--txt-3);
  border:1px solid var(--line);border-radius:5px;padding:1px 5px;margin-bottom:6px;
}
.cursor{display:inline-block;width:7px;height:14px;background:var(--brand);border-radius:1px;
  vertical-align:-2px;margin-left:2px;animation:blink 1s steps(2,start) infinite}
@keyframes blink{50%{opacity:0}}
.err{color:#ffb4b4;border-color:rgba(255,107,107,.4);background:rgba(255,107,107,.08)}
.sys-tip{text-align:center;font-size:11.5px;color:var(--txt-3);margin:10px 0}

/* ---------- 输入区 ---------- */
.composer{
  border-top:1px solid var(--line);background:#101a26;
  padding:9px 12px calc(7px + var(--safe-b));
}
.composer-inner{display:flex;align-items:flex-end;gap:8px}
#input{
  flex:1;resize:none;max-height:110px;min-height:42px;
  padding:11px 13px;border-radius:12px;
  background:var(--card);border:1px solid var(--line);
  font-size:14px;line-height:1.5;outline:none;transition:.18s;
}
#input:focus{border-color:var(--brand);background:var(--card-2)}
#input::placeholder{color:var(--txt-3)}
.send{
  width:42px;height:42px;flex:0 0 42px;border:none;border-radius:12px;cursor:pointer;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
  display:grid;place-items:center;box-shadow:0 4px 14px rgba(79,140,255,.28);transition:.18s;
}
.send:active{transform:scale(.94)}
.send:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.send.stop{background:linear-gradient(135deg,#5a6b80,#3f4d5e);box-shadow:none}
.disclaimer{text-align:center;font-size:10.5px;color:var(--txt-3);margin-top:7px;line-height:1.5}

.toast{
  position:fixed;left:50%;bottom:88px;transform:translateX(-50%);
  background:rgba(20,30,44,.96);border:1px solid var(--line);color:var(--txt);
  padding:9px 16px;border-radius:10px;font-size:13px;z-index:99;
  box-shadow:0 8px 26px rgba(0,0,0,.45);animation:in .2s ease;max-width:80%;text-align:center;
}

@media (min-width:560px){
  .app{height:min(100dvh,860px);margin:max(0px,calc((100dvh - 860px)/2)) auto;border-radius:18px;overflow:hidden;border:1px solid var(--line)}
}