*,*::before,*::after{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0}
body{
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);color:var(--text);
  -webkit-font-smoothing:antialiased;
  overscroll-behavior:none;
}

/* ---------- 主题 ---------- */
body[data-theme="dark"]{
  --bg:#0d1117; --panel:#151d27; --panel2:#1c2633; --me:#2f7ef0; --me-text:#fff;
  --text:#e8eef7; --dim:#8a99ad; --line:#202c39; --accent:#4f9cf9;
  --bubble-her:#1b2430; --bubble-me:#2f7ef0;
}
body[data-theme="light"]{
  --bg:#eef2f7; --panel:#ffffff; --panel2:#f2f5fa; --me:#2f7ef0; --me-text:#fff;
  --text:#16202c; --dim:#6b7a8c; --line:#dbe3ee; --accent:#2f7ef0;
  --bubble-her:#ffffff; --bubble-me:#2f7ef0;
}
body[data-theme="qq"]{
  --bg:#eef3fa; --panel:#ffffff; --panel2:#f3f7fd; --me:#12b7f5; --me-text:#fff;
  --text:#13202c; --dim:#6d7f93; --line:#e0e8f3; --accent:#12b7f5;
  --bubble-her:#ffffff; --bubble-me:#12b7f5;
}

/* ---------- 布局 ---------- */
#app{
  position:fixed;inset:0;display:flex;flex-direction:column;
  background:var(--bg);background-size:cover;background-repeat:no-repeat;background-position:center top;
  transition:background .25s;
}
.top{
  flex:0 0 auto;display:flex;align-items:center;gap:8px;
  padding:calc(10px + env(safe-area-inset-top)) 12px 10px;
  background:var(--panel);border-bottom:1px solid var(--line);
  position:relative;z-index:5;
}
.top .who{display:flex;align-items:center;gap:10px;flex:1;min-width:0}
.ava{width:40px;height:40px;border-radius:50%;overflow:hidden;background:var(--panel2);display:block;flex:0 0 auto}
.ava img{width:100%;height:100%;object-fit:cover;display:block;border-radius:50%}
.ava.big{width:64px;height:64px}
.meta{min-width:0}
.name{font-size:16px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.state{font-size:12px;color:var(--dim);margin-top:1px;display:flex;align-items:center;gap:5px}
.state::before{content:"";width:7px;height:7px;border-radius:50%;background:#3ecf8e;flex:0 0 7px}
.icon{
  appearance:none;border:0;background:transparent;color:var(--text);
  font-size:22px;line-height:1;width:36px;height:36px;border-radius:10px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;flex:0 0 auto;
}
.icon:active{background:var(--panel2)}

.msgs{
  flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;
  padding:14px 12px 8px;display:flex;flex-direction:column;gap:12px;
  scroll-behavior:smooth;
}
.msgs::-webkit-scrollbar{width:0}

/* ---------- 消息 ---------- */
.row{display:flex;gap:8px;align-items:flex-end;max-width:100%}
.row .ava.sm{width:34px;height:34px;flex:0 0 34px}
.bubble{
  max-width:min(76%,560px);padding:9px 13px;border-radius:var(--radius,14px);
  background:var(--bubble-her);color:var(--text);
  font-size:var(--fs,16px);line-height:1.5;word-break:break-word;white-space:pre-wrap;
  box-shadow:0 1px 0 rgba(0,0,0,.04);
}
body[data-theme="dark"] .bubble{box-shadow:none}
.row.me{flex-direction:row-reverse}
.row.me .bubble{background:var(--bubble-me);color:var(--me-text);border-bottom-right-radius:4px}
.row.her .bubble{border-bottom-left-radius:4px}

.row .time{align-self:center;color:var(--dim);font-size:11px}

.bubble.media{padding:0;background:transparent;box-shadow:none;border-radius:0}
.bubble.media img{max-width:min(38vw,150px);max-height:190px;object-fit:contain;border-radius:12px;display:block;cursor:zoom-in;background:transparent}

.sticker{background:transparent;box-shadow:none;padding:0}
.sticker img{width:72px;height:72px;object-fit:contain;border-radius:8px;background:transparent}

.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;max-width:min(72vw,360px)}
.card img{width:100%;display:block}

/* typing */
.typing{display:inline-flex;gap:4px;padding:6px 2px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--dim);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.25;transform:translateY(0)}30%{opacity:1;transform:translateY(-2px)}}

.sys{text-align:center;color:var(--dim);font-size:12px;margin:4px 0}
.stub{
  position:absolute;left:0;right:0;bottom:calc(64px + env(safe-area-inset-bottom));
  text-align:center;font-size:11px;color:var(--dim);pointer-events:none;
}

/* ---------- 输入栏 ---------- */
.composer{
  flex:0 0 auto;display:flex;align-items:flex-end;gap:8px;
  padding:8px 10px calc(8px + env(safe-area-inset-bottom));
  background:var(--panel);border-top:1px solid var(--line);overflow:hidden;
}
.box{flex:1 1 auto;min-width:0;background:var(--panel2);border-radius:20px;padding:6px 12px;min-height:40px;display:flex;align-items:center;overflow:hidden}
.box textarea{
  width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--text);
  font:inherit;font-size:var(--fs,16px);line-height:1.45;resize:none;max-height:120px;
}
.box textarea::placeholder{color:var(--dim)}
.send{
  width:40px;height:40px;border-radius:50%;border:0;flex:0 0 40px;
  background:var(--me);color:#fff;font-size:20px;display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.send:disabled{opacity:.45}
.icon.plus,.icon.emo{width:36px;height:36px;font-size:24px;color:var(--dim)}

/* ---------- 抽屉 ---------- */
.mask{position:fixed;inset:0;background:rgba(0,0,0,.45);opacity:0;pointer-events:none;transition:.2s;z-index:30}
.mask.on{opacity:1;pointer-events:auto}
.drawer{
  position:fixed;left:0;right:0;bottom:0;z-index:31;
  background:var(--panel);border-top:1px solid var(--line);
  border-radius:18px 18px 0 0;
  max-height:82vh;overflow-y:auto;
  padding:16px 16px calc(20px + env(safe-area-inset-bottom));
  transform:translateY(102%);transition:transform .26s cubic-bezier(.2,.8,.2,1);
}
.drawer.on{transform:translateY(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.drawer-head h3{margin:0;font-size:16px}
.link{background:none;border:0;color:var(--accent);font-size:14px;cursor:pointer;padding:6px}
.field{margin:14px 0}
.field > label{display:block;font-size:12px;color:var(--dim);margin-bottom:8px}
.field input[type=text],#nameInput{
  width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:10px;
  color:var(--text);font:inherit;font-size:15px;padding:10px 12px;outline:0;
}
.ava-row{display:flex;align-items:center;gap:14px}
.upload{
  border:1px solid var(--line);background:var(--panel2);color:var(--text);
  border-radius:10px;padding:8px 14px;font-size:13px;cursor:pointer;
}
.swatches{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.swatches .b{
  aspect-ratio:1/1;border-radius:12px;border:2px solid transparent;cursor:pointer;
  background-size:cover;background-position:center;
}
.swatches .b.on{border-color:var(--accent)}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  border:1px solid var(--line);background:var(--panel2);color:var(--text);
  border-radius:99px;padding:8px 16px;font-size:14px;cursor:pointer;
}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}
.drawer .tip{font-size:12px;color:var(--dim);line-height:1.6;margin:16px 0 0}

/* ---------- 表情面板 ---------- */
.emoji{
  position:fixed;left:0;right:0;bottom:0;z-index:29;
  background:var(--panel);border-top:1px solid var(--line);
  padding:12px 12px calc(12px + env(safe-area-inset-bottom));
  display:grid;grid-template-columns:repeat(6,1fr);gap:10px;
  transform:translateY(105%);transition:transform .22s;
  max-height:46vh;overflow-y:auto;
}
.emoji.on{transform:translateY(0)}
.emoji button{background:var(--panel2);border:0;border-radius:10px;padding:6px;cursor:pointer;font-size:26px;line-height:1;aspect-ratio:1/1}
.emoji button img{width:100%;height:100%;object-fit:contain}

/* ---------- 登录 ---------- */
.login{position:fixed;inset:0;z-index:30;display:none;align-items:center;justify-content:center;background:var(--bg);padding:24px}
.login.on{display:flex}
.login-card{width:100%;max-width:340px;text-align:center}
.login-ava{width:88px;height:88px;border-radius:50%;object-fit:cover;margin-bottom:12px}
.login-card h2{margin:0 0 6px;font-size:19px}
.login-sub{color:var(--dim);font-size:13px;margin:0 0 18px}
.login-card input{width:100%;margin-bottom:10px;background:var(--panel2);border:1px solid var(--line);border-radius:10px;color:var(--text);font:inherit;padding:12px 14px;outline:0}
.login-card .primary{width:100%;background:var(--me);color:#fff;border:0;border-radius:10px;padding:12px;font-size:15px;font-weight:600;cursor:pointer;margin-top:4px}
.login-err{color:#f4585a;font-size:13px;min-height:18px;margin:8px 0 0}
.login-tip{color:var(--dim);font-size:11px;margin-top:14px;line-height:1.6}

/* ---------- 会话列表 ---------- */
.sessions{position:fixed;left:0;top:0;bottom:0;width:min(78vw,320px);z-index:22;background:var(--panel);border-right:1px solid var(--line);padding:calc(14px + env(safe-area-inset-top)) 12px 14px;transform:translateX(-102%);transition:transform .24s cubic-bezier(.2,.8,.2,1);overflow-y:auto}
.sessions.on{transform:translateX(0)}
.session-list{list-style:none;margin:8px 0 0;padding:0}
.session-list li{padding:11px 12px;border-radius:10px;cursor:pointer;margin-bottom:4px}
.session-list li.on{background:var(--panel2)}
.session-list li:active{background:var(--panel2)}
.session-list .sl-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.session-list .sl-time{font-size:11px;color:var(--dim);margin-top:3px}
.session-list .dim{color:var(--dim);font-size:13px;padding:12px}

button.ghost{background:transparent;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:9px 14px;font-size:13px;cursor:pointer}

/* ---------- 新建：背景上传 / 相册拍照面板 ---------- */
.bg-preview{width:56px;height:56px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);background-size:cover;background-position:center;flex:0 0 auto}
.sheet{
  position:fixed;left:0;right:0;bottom:0;z-index:31;display:flex;flex-direction:column;gap:8px;
  padding:12px 16px calc(16px + env(safe-area-inset-bottom));
  background:var(--panel);border-top:1px solid var(--line);border-radius:18px 18px 0 0;
  transform:translateY(102%);transition:transform .22s ease;
}
.sheet.on{transform:translateY(0)}
.sheet button{background:var(--panel2);border:0;border-radius:14px;padding:14px;font:inherit;color:var(--text);cursor:pointer}
.sheet button[data-k=cancel]{color:var(--dim)}
#app{background-size:cover;background-position:center;background-attachment:fixed}