/* ============================================================
   SeaChat · 简洁白色主题（响应式：手机/平板/电脑）
   图标采用 CSS mask + currentColor，随文字颜色变化
   class 名与 app.js 渲染保持一致：room-item/rn/rd、
   msg-row/self/avatar/msg-body/msg-meta/bubble/role-badge 等
   ============================================================ */
:root{
  --bg:#f3f4f6;
  --panel:#ffffff;
  --panel-2:#f7f8fa;
  --brand:#4f46e5;
  --brand-d:#4338ca;
  --brand-soft:rgba(79,70,229,.08);
  --text:#1f2430;
  --text-2:#6b7280;
  --text-3:#9ca3af;
  --border:#e7e9ee;
  --bubble-me:#4f46e5;
  --bubble-other:#ffffff;
  --radius:14px;
  --radius-s:10px;
  --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
  --shadow-lg:0 12px 32px rgba(16,24,40,.16);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.5;
  -webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;
}
button{font-family:inherit}
a{color:var(--brand)}

/* ===== 图标（mask + currentColor） ===== */
.ic{display:inline-block;width:20px;height:20px;background-color:currentColor;
  -webkit-mask:var(--i) center/contain no-repeat;mask:var(--i) center/contain no-repeat;flex:0 0 auto;vertical-align:middle}
.ic16{width:16px;height:16px}.ic18{width:18px;height:18px}.ic20{width:20px;height:20px}
.ic22{width:22px;height:22px}.ic24{width:24px;height:24px}

/* ===== 三栏布局 ===== */
.chat-shell{display:flex;height:100vh;max-width:1440px;margin:0 auto;background:var(--panel);box-shadow:var(--shadow)}
.side-left,.side-right{width:284px;flex:0 0 284px;background:var(--panel-2);display:flex;flex-direction:column;overflow:hidden}
.side-left{border-right:1px solid var(--border)}
.side-right{border-left:1px solid var(--border)}
.chat-main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--panel)}

/* ===== 左侧：房间列表 ===== */
.panel-head{display:flex;align-items:center;gap:11px;padding:16px 16px;border-bottom:1px solid var(--border)}
.logo-mini{width:38px;height:38px;border-radius:11px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.panel-head .t{font-weight:700;font-size:16px}
.panel-head .sub{font-size:12px;color:var(--text-2)}
.room-list{flex:1;overflow-y:auto;padding:8px 6px}
.room-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:var(--radius-s);cursor:pointer;margin:2px 4px;transition:background .12s}
.room-item:hover{background:#eef0f3}
.room-item.active{background:var(--brand-soft);color:var(--brand)}
.room-ico{width:38px;height:38px;border-radius:11px;background:#eceef2;color:var(--brand);display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.room-item.active .room-ico{background:#fff}
.rn{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rd{font-size:12px;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.room-admin{padding:10px 12px;border-top:1px solid var(--border)}
.adm-btn{width:100%;border:1px dashed var(--brand);background:transparent;color:var(--brand);border-radius:var(--radius-s);padding:9px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px}
.adm-btn:hover{background:var(--brand-soft)}

/* ===== 中间：聊天 ===== */
.chat-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--border);flex:0 0 auto}
.online-dot{width:9px;height:9px;border-radius:50%;background:#22c55e;flex:0 0 auto;box-shadow:0 0 0 3px rgba(34,197,94,.18)}
.ct{font-weight:700;font-size:16px}
.cs{font-size:12px;color:var(--text-2)}
.chat-head-right{margin-left:auto;display:flex;align-items:center;gap:6px}
.icon-btn{background:transparent;border:none;color:var(--text-2);width:38px;height:38px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:.12s}
.icon-btn:hover{background:#eef0f3;color:var(--text)}
.icon-btn.active{color:var(--brand);background:var(--brand-soft)}

.msg-area{flex:1;overflow-y:auto;padding:14px 0;background:var(--panel)}
.sys-line{text-align:center;color:var(--text-3);font-size:13px;padding:14px 20px;line-height:1.7}

/* 消息行 */
.msg-row{display:flex;gap:10px;padding:5px 16px;align-items:flex-start}
.msg-row.self{flex-direction:row-reverse}
.avatar{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:15px;flex:0 0 auto}
.msg-body{max-width:min(72%,580px);min-width:0}
.msg-row.self .msg-body{display:flex;flex-direction:column;align-items:flex-end}
.msg-meta{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--text-2);margin-bottom:3px}
.msg-row.self .msg-meta{flex-direction:row-reverse}
.uname{font-weight:600;color:var(--text)}
.role-badge{font-size:10px;padding:1px 6px;border-radius:6px;background:var(--brand);color:#fff;font-weight:600}
.role-badge.super{background:#d97706}.role-badge.admin{background:#0ea5e9}
.bubble{display:inline-block;padding:9px 13px;border-radius:15px;background:var(--bubble-other);color:var(--text);box-shadow:var(--shadow);word-break:break-word;white-space:pre-wrap;line-height:1.55;max-width:100%}
.msg-row.self .bubble{background:var(--bubble-me);color:#fff;border-bottom-right-radius:5px}
.msg-row:not(.self) .bubble{border-bottom-left-radius:5px}
.bubble.revoked{background:var(--panel-2);color:var(--text-3);font-style:italic}
.reply-chip{display:inline-block;font-size:12px;color:var(--text-2);border-left:3px solid var(--brand);padding:2px 8px;margin:0 0 5px;background:var(--panel-2);border-radius:0 6px 6px 0;cursor:pointer;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.msg-img{max-width:240px;max-height:280px;border-radius:12px;cursor:pointer;display:block;box-shadow:var(--shadow)}
.img-expire{display:block;font-size:11px;color:var(--text-3);margin-top:4px}
.msg-ops{display:flex;gap:2px;opacity:0;transition:.12s}
.msg-row:hover .msg-ops{opacity:1}
.msg-ops .icon-btn{width:28px;height:28px}
.msg-ops button{background:var(--panel-2);border:1px solid var(--border);color:var(--text-2);border-radius:8px;padding:3px 9px;font-size:12px;cursor:pointer}
.msg-ops button:hover{background:#eef0f3;color:var(--text)}

/* 输入区 */
.input-area{border-top:1px solid var(--border);padding:10px 14px 12px;flex:0 0 auto;background:var(--panel)}
.muted-banner{background:#fff4f4;color:#dc2626;border:1px solid #fecaca;border-radius:10px;padding:8px 12px;font-size:13px;margin-bottom:8px;text-align:center}
.reply-bar{background:var(--panel-2);border:1px solid var(--border);border-radius:10px;padding:7px 12px;font-size:13px;color:var(--text-2);margin-bottom:8px;display:none;align-items:center;gap:8px}
.reply-bar.show{display:flex}
.reply-bar .x{margin-left:auto;cursor:pointer;color:var(--text-3);display:inline-flex}
.input-row{display:flex;align-items:flex-end;gap:8px;background:var(--panel-2);border:1px solid var(--border);border-radius:14px;padding:6px 8px;transition:border-color .12s}
.input-row:focus-within{border-color:var(--brand)}
#msgInput{border:none;background:transparent;resize:none;flex:1;font:inherit;outline:none;max-height:120px;padding:8px 4px;line-height:1.5;color:var(--text)}
.send-btn{background:var(--brand);color:#fff;border:none;border-radius:11px;padding:9px 16px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px;flex:0 0 auto;transition:.12s}
.send-btn:hover{background:var(--brand-d)}
.send-btn:active{transform:scale(.97)}
.img-label{display:inline-flex}

/* ===== 右侧：在线/管理/我的 ===== */
.tabs{display:flex;border-bottom:1px solid var(--border);flex:0 0 auto}
.tab{flex:1;text-align:center;padding:13px 0;font-size:14px;color:var(--text-2);cursor:pointer;position:relative;font-weight:500}
.tab.active{color:var(--brand);font-weight:700}
.tab.active::after{content:"";position:absolute;left:50%;bottom:-1px;transform:translateX(-50%);width:28px;height:3px;border-radius:3px;background:var(--brand)}
.tab-body{flex:1;overflow-y:auto;padding:10px}
.usr-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px}
.usr-item:hover{background:#eef0f3}
.usr-ava{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;flex:0 0 auto;font-size:14px}
.usr-name{font-size:14px;font-weight:500}
.usr-sub{font-size:12px;color:var(--text-2)}
.list-btn{width:100%;text-align:left;border:1px solid var(--border);background:var(--panel);border-radius:10px;padding:11px;margin:6px 0;cursor:pointer;display:flex;align-items:center;gap:9px;color:var(--text);font-size:14px}
.list-btn:hover{background:var(--panel-2)}
.list-btn.danger{color:#dc2626;border-color:#fecaca}
.list-btn.danger:hover{background:#fff4f4}
.list-btn .ic{color:var(--brand)}
.list-btn.danger .ic{color:#dc2626}

/* ===== 顶部移动栏（手机显示） ===== */
.mobile-bar{display:none}

/* ===== 抽屉遮罩 ===== */
.drawer-mask{display:none;position:fixed;inset:0;background:rgba(17,24,39,.42);z-index:60}

/* ===== 弹窗 ===== */
.modal-mask{display:none;position:fixed;inset:0;background:rgba(17,24,39,.45);z-index:100;align-items:center;justify-content:center;padding:20px}
.modal-mask.show{display:flex}
.modal{background:var(--panel);border-radius:18px;padding:22px;width:100%;max-width:440px;box-shadow:var(--shadow-lg);max-height:86vh;overflow:auto}
.modal h3{margin:0 0 14px;font-size:18px}
.modal input,.modal textarea{width:100%;border:1px solid var(--border);border-radius:10px;padding:10px 12px;font:inherit;margin:8px 0;outline:none}
.modal input:focus,.modal textarea:focus{border-color:var(--brand)}
.modal-btns{display:flex;gap:10px;margin-top:14px}
.modal-btns button{flex:1;border:none;border-radius:11px;padding:11px;font-weight:600;cursor:pointer;font-size:14px}
#modalCancel{background:var(--panel-2);color:var(--text-2)}
#modalOk{background:var(--brand);color:#fff}
#modalOk:hover{background:var(--brand-d)}

/* ===== 图片查看 ===== */
.img-viewer{display:none;position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:200;align-items:center;justify-content:center;padding:20px}
.img-viewer.show{display:flex}
.img-viewer img{max-width:100%;max-height:100%;border-radius:10px}

/* ===== Toast ===== */
.toast-wrap{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:300;display:flex;flex-direction:column;gap:8px;align-items:center}
.toast{padding:10px 18px;background:rgba(31,36,48,.92);color:#fff;border-radius:12px;font-size:14px;box-shadow:var(--shadow-lg);animation:toastIn .2s ease}
@keyframes toastIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ===== 登录页 ===== */
.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px;background:var(--bg)}
.login-wrap{width:100%;max-width:380px}
.login-card{background:var(--panel);border-radius:20px;padding:34px 28px;box-shadow:var(--shadow-lg);text-align:center}
.logo-ring{width:60px;height:60px;border-radius:16px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.login-title{margin:0 0 4px;font-size:26px;font-weight:800;letter-spacing:.5px}
.login-sub{margin:0 0 24px;color:var(--text-2);font-size:13px}
.field{text-align:left;margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px;font-weight:500}
.field input{width:100%;border:1px solid var(--border);border-radius:12px;padding:12px 14px;font:inherit;outline:none;transition:border-color .12s;background:var(--panel-2)}
.field input:focus{border-color:var(--brand);background:#fff}
.login-btn{width:100%;background:var(--brand);color:#fff;border:none;border-radius:12px;padding:13px;font-size:15px;font-weight:700;cursor:pointer;margin-top:6px;transition:.12s}
.login-btn:hover{background:var(--brand-d)}
.login-btn:active{transform:scale(.985)}
.login-tip{font-size:13px;min-height:18px;margin:12px 0 0;color:var(--brand)}
.login-foot{margin:18px 0 0;color:var(--text-3);font-size:12px}

/* ===== 响应式 ===== */
@media(max-width:860px){
  .chat-shell{display:block;position:relative;box-shadow:none}
  .side-left,.side-right{position:fixed;top:0;bottom:0;z-index:70;width:82%;max-width:320px;
    transform:translateX(-110%);transition:transform .25s ease;box-shadow:var(--shadow-lg)}
  .side-left{left:0}
  .side-right{right:0;transform:translateX(110%)}
  .side-left.open,.side-right.open{transform:translateX(0)}
  .side-left{border-right:none}
  .side-right{border-left:none}
  .chat-main{height:100vh}
  .mobile-bar{display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--panel);z-index:10}
  .mb-title{flex:1;text-align:center;font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .drawer-mask.show{display:block}
  .msg-body{max-width:82%}
  .chat-head{display:none}
}
@media(min-width:861px){.drawer-mask{display:none!important}}
@media(max-width:420px){
  .msg-row{padding:5px 10px}
  .msg-body{max-width:88%}
}