:root{
  --blue:#2AABEE;
  --blue-strong:#1788d8;
  --bg:#eef3f8;
  --panel:#ffffff;
  --panel-soft:#f8fbff;
  --line:#dfe7f0;
  --text:#1f2937;
  --muted:#6b7a90;
  --shadow:0 12px 30px rgba(40,72,100,.08);
  --bubble-in:#ffffff;
  --bubble-out:#e8f4ff;
  --green:#27a46a;
  --danger:#ef476f;
  --mark:#ffe08a;
}
:root[data-theme="dark"]{
  --bg:#0f1721;
  --panel:#17212b;
  --panel-soft:#1c2733;
  --line:#26313d;
  --text:#e7edf3;
  --muted:#8696a8;
  --shadow:0 12px 30px rgba(0,0,0,.35);
  --bubble-in:#1c2733;
  --bubble-out:#2b5278;
  --mark:#8a6d1a;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--text);
  background:var(--bg);
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  overscroll-behavior:none;
}
body.locked{overflow:hidden}
body.locked .app{filter:blur(10px) saturate(.9);pointer-events:none;user-select:none}

.app{height:100%;display:grid;grid-template-rows:auto 1fr}
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 16px;
  background:linear-gradient(135deg,var(--blue) 0%,var(--blue-strong) 100%);
  color:#fff;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.logo{width:12px;height:12px;border-radius:999px;background:#fff;box-shadow:0 0 0 5px rgba(255,255,255,.15);flex:0 0 auto}
.title{font-size:16px;font-weight:800}
.subtitle{margin-top:2px;font-size:12px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:min(48vw,600px)}
.top-actions{display:flex;align-items:center;gap:8px}
.status{display:inline-flex;align-items:center;gap:6px;font-size:12px;background:rgba(255,255,255,.16);padding:5px 10px;border-radius:999px}
.dot{width:8px;height:8px;border-radius:999px;background:#ffce54}
.dot.ok{background:#7CFFA9}
.dot.err{background:#ff8fa6}

.layout{display:grid;grid-template-columns:340px 1fr;min-height:0}
.panel{min-height:0;display:flex;flex-direction:column;background:var(--panel)}
.side{border-right:1px solid var(--line)}
.side-head{display:flex;gap:8px;padding:10px;border-bottom:1px solid var(--line)}
.input{
  flex:1;min-width:0;padding:8px 10px;border-radius:10px;border:1px solid var(--line);
  background:var(--panel-soft);color:var(--text);outline:none;font-size:13px;
}
.input:focus{border-color:var(--blue)}
.small-input{max-width:150px;padding:6px 8px}

.btn{
  border:1px solid var(--line);background:var(--panel-soft);color:var(--text);
  border-radius:10px;padding:8px 14px;cursor:pointer;font-size:13px;white-space:nowrap;
}
.btn:hover{border-color:var(--blue)}
.btn.primary{background:var(--blue-strong);border-color:var(--blue-strong);color:#fff}
.btn.small{padding:6px 10px;font-size:12px}
.btn.active{background:var(--blue);border-color:var(--blue);color:#fff}
.icon-btn{
  border:none;background:rgba(255,255,255,.16);color:#fff;border-radius:10px;
  width:32px;height:32px;cursor:pointer;font-size:15px;line-height:1;
}
.compose-row .icon-btn{background:var(--panel-soft);color:var(--text);border:1px solid var(--line)}
.mini{
  border:1px solid var(--line);background:var(--panel-soft);color:var(--muted);
  border-radius:8px;padding:2px 8px;font-size:12px;cursor:pointer;
}
.mini:hover{color:var(--text);border-color:var(--blue)}

.chat-list{flex:1;overflow-y:auto;padding:6px}
.chat-item{
  padding:10px 12px;border-radius:12px;cursor:pointer;margin-bottom:2px;
  border:1px solid transparent;
}
.chat-item:hover{background:var(--panel-soft)}
.chat-item.active{background:var(--panel-soft);border-color:var(--blue)}
.chat-head-row{display:flex;align-items:center;justify-content:space-between;gap:8px}
.chat-name{font-weight:700;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-actions{display:flex;align-items:center;gap:6px;flex:0 0 auto}
.unread{
  min-width:20px;height:20px;border-radius:999px;background:var(--blue);color:#fff;
  font-size:11px;display:inline-flex;align-items:center;justify-content:center;padding:0 6px;font-weight:700;
}
.chat-pin{border:none;background:none;color:var(--muted);font-size:12px;cursor:pointer;padding:2px 4px}
.chat-pin.active{color:var(--blue-strong);font-weight:700}
.preview{margin-top:3px;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meta{margin-top:3px;display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}

.chat{min-width:0}
.chat-head{
  display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);
  background:var(--panel);
}
.chat-head-main{flex:1;min-width:0}
.chat-title{font-weight:800;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-sub{font-size:12px;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-head-actions{display:flex;align-items:center;gap:8px}
.back{display:none}

.message-list{
  flex:1;overflow-y:auto;padding:16px 18px;display:flex;flex-direction:column;gap:10px;
  background:var(--bg);
  overflow-anchor:none;
}
.load-older{align-self:center;margin-bottom:4px}
.empty{color:var(--muted);text-align:center;padding:40px 10px;font-size:13px}
.message{max-width:min(680px,86%);display:flex;flex-direction:column;gap:4px}
.message.in{align-self:flex-start}
.message.out{align-self:flex-end;align-items:flex-end}
.mmeta{display:flex;gap:8px;align-items:center;font-size:11px;color:var(--muted)}
.pill{background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:1px 8px}
.bubble{
  padding:9px 12px;border-radius:14px;background:var(--bubble-in);border:1px solid var(--line);
  font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word;box-shadow:var(--shadow);
}
.message.out .bubble{background:var(--bubble-out)}
.message.pending{opacity:.6}
.message.failed .bubble{border-color:var(--danger)}
.send-state{font-size:11px;color:var(--muted)}
.send-state.failed{color:var(--danger)}
mark.match{background:var(--mark);border-radius:3px;padding:0 1px}

.media-card{
  background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  max-width:360px;box-shadow:var(--shadow);
}
.media-frame{position:relative;display:block;background:#0004;min-height:60px}
.media-frame img.thumb, .media-frame video{
  display:block;width:100%;max-height:320px;object-fit:contain;background:#000;
}
.media-frame img.thumb{cursor:pointer}
.media-frame.ph{display:flex;align-items:center;justify-content:center;height:90px;font-size:30px;color:var(--muted);background:var(--panel-soft)}
.play-badge{
  position:absolute;inset:0;margin:auto;width:52px;height:52px;border-radius:999px;
  background:rgba(0,0,0,.55);color:#fff;font-size:20px;display:flex;align-items:center;justify-content:center;
  pointer-events:none;
}
.media-info{padding:8px 10px;font-size:12px;color:var(--muted);display:flex;flex-direction:column;gap:4px}
.media-title{font-weight:700;color:var(--text)}
.media-actions{display:flex;gap:8px}
.media-actions a{color:var(--blue-strong);text-decoration:none;font-size:12px}
.media-audio{padding:8px}
.media-audio audio{width:260px;max-width:100%}
.actions{display:flex;gap:6px}

.compose-area{border-top:1px solid var(--line);background:var(--panel);padding:8px 12px}
.replying{
  display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);
  padding:4px 8px;margin-bottom:6px;border-left:3px solid var(--blue);background:var(--panel-soft);border-radius:6px;
}
.compose-row{display:flex;align-items:flex-end;gap:8px}
.emoji-row{display:flex;gap:4px}
#compose{
  flex:1;min-height:40px;max-height:130px;resize:vertical;padding:9px 12px;border-radius:12px;
  border:1px solid var(--line);background:var(--panel-soft);color:var(--text);outline:none;
  font-size:14px;font-family:inherit;
}
#compose:focus{border-color:var(--blue)}

.toast{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);
  background:var(--text);color:var(--bg);padding:9px 16px;border-radius:999px;font-size:13px;
  opacity:0;pointer-events:none;transition:.25s;z-index:60;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

.lightbox{
  position:fixed;inset:0;background:rgba(0,0,0,.85);display:none;align-items:center;justify-content:center;z-index:70;
}
.lightbox.show{display:flex}
.lightbox-body img,.lightbox-body video{max-width:94vw;max-height:88vh;border-radius:8px}
.lightbox-close{
  position:absolute;top:14px;right:16px;border:none;background:rgba(255,255,255,.15);color:#fff;
  width:38px;height:38px;border-radius:999px;font-size:16px;cursor:pointer;
}

.settings-mask{
  position:fixed;inset:0;background:rgba(15,23,33,.55);display:none;align-items:center;justify-content:center;z-index:80;
}
.settings-mask.show{display:flex}
.settings-card{
  width:min(420px,92vw);background:var(--panel);border-radius:16px;padding:20px;box-shadow:var(--shadow);
}
.settings-title{margin:0 0 14px;font-size:16px}
.settings-grid{display:flex;flex-direction:column;gap:12px}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:12px;color:var(--muted)}
.field input{
  padding:9px 11px;border-radius:10px;border:1px solid var(--line);background:var(--panel-soft);
  color:var(--text);outline:none;
}
.settings-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}

.lock-screen{
  position:fixed;inset:0;background:rgba(15,23,33,.62);backdrop-filter:blur(4px);
  display:none;align-items:center;justify-content:center;z-index:90;
}
.lock-screen.show{display:flex}
.lock-card{
  width:min(360px,90vw);background:var(--panel);border-radius:18px;padding:26px;text-align:center;box-shadow:var(--shadow);
}
.lock-title{margin:0 0 8px;font-size:18px}
.lock-desc{font-size:13px;color:var(--muted);min-height:18px}
.lock-row{margin:16px 0 12px}
#lockInput{
  width:100%;padding:11px 12px;border-radius:12px;border:1px solid var(--line);
  background:var(--panel-soft);color:var(--text);outline:none;text-align:center;font-size:16px;letter-spacing:3px;
}
#lockInput:focus{border-color:var(--blue)}

@media (max-width:920px){
  .layout{grid-template-columns:1fr}
  body[data-view="list"] .chat{display:none}
  body[data-view="chat"] .side{display:none}
  .back{display:inline-block}
  .subtitle{max-width:40vw}
  .small-input{max-width:110px}
  .emoji-row{display:none}
  .message{max-width:92%}
}