/* =========================================================
   TERMINAL // IM  —— 终端暗色主题
   色板：
     --bg        #090c0a   主背景（近黑，微绿）
     --panel     #0e1310   面板背景
     --raised    #131a15   悬浮/输入区
     --line      #1f2b23   描边
     --text      #d6ecd f  正文（磷光白绿）——见下方实际值
     --dim       #5f7a6c   次要文字
     --accent    #37e07d   磷光绿（主强调 / 大厅）
     --accent-2  #ffb454   琥珀（私聊 / 未读）
     --danger    #ff5f56   错误/退出
   字体：系统等宽字体栈，全站等宽，强化"终端"识别度
   ========================================================= */

:root{
  --bg:#090c0a;
  --panel:#0e1310;
  --raised:#131a15;
  --raised-2:#182019;
  --line:#1f2b23;
  --line-soft:#17201a;
  --text:#d7ecdd;
  --dim:#5f7a6c;
  --dim-2:#3d5347;
  --accent:#37e07d;
  --accent-soft:#173625;
  --accent-2:#ffb454;
  --accent-2-soft:#3a2c14;
  --danger:#ff5f56;
  --danger-soft:#2e1615;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Fira Code", Menlo, Consolas, "Cascadia Mono", monospace;
  --radius: 3px;
}

*{ box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html,body{ height:100%; }
@supports (height: 100dvh){
  html,body{ height:100dvh; }
}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--mono);
  font-size:14px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

/* 细微扫描线氛围层，弱化处理，不喧宾夺主 */
body::before{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  z-index:9999;
  background:repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0.012) 0px,
    rgba(255,255,255,0.012) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode:overlay;
}
@media (prefers-reduced-motion: reduce){
  body::before{ display:none; }
}

a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }

::selection{ background:var(--accent); color:#04140a; }

/* 滚动条 */
::-webkit-scrollbar{ width:9px; height:9px; }
::-webkit-scrollbar-track{ background:var(--panel); }
::-webkit-scrollbar-thumb{ background:var(--line); border-radius:5px; }
::-webkit-scrollbar-thumb:hover{ background:var(--dim-2); }

button, input, textarea{ font-family:inherit; font-size:inherit; color:inherit; }

.icon{ width:1em; height:1em; display:inline-block; vertical-align:-0.15em; flex:none; }

/* ---------- 通用：焦点可见 ---------- */
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }

/* ---------- 顶部小标签 / eyebrow ---------- */
.eyebrow{
  color:var(--dim);
  letter-spacing:0.12em;
  font-size:11px;
  text-transform:uppercase;
}

/* =========================================================
   带 ASCII 边角的终端面板（登录/注册/设定代号 用）
   ========================================================= */
.crt-frame{
  position:relative;
  min-height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:32px 16px;
  padding-top:calc(32px + env(safe-area-inset-top));
  padding-bottom:calc(32px + env(safe-area-inset-bottom));
}

.term-card{
  position:relative;
  width:100%;
  max-width:420px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 26px 26px;
}
.term-card::before,
.term-card::after,
.panel::before,
.panel::after{
  content:"";
  position:absolute;
  width:10px; height:10px;
  border:1px solid var(--dim-2);
  opacity:0.7;
}
.term-card::before, .panel::before{ top:-1px; left:-1px; border-right:none; border-bottom:none; }
.term-card::after, .panel::after{ top:-1px; right:-1px; border-left:none; border-bottom:none; }

.term-card__bar{
  display:flex; align-items:center; gap:8px;
  margin:-4px 0 20px;
  color:var(--dim);
  font-size:12px;
}
.term-card__bar .dot{ width:8px; height:8px; border-radius:50%; background:var(--line); }
.term-card__bar .dot.g{ background:var(--accent); box-shadow:0 0 6px var(--accent); }

.term-card h1{
  margin:0 0 4px;
  font-size:17px;
  letter-spacing:0.03em;
  color:var(--text);
}
.term-card h1 .caret{ color:var(--accent); }
.term-card p.sub{
  margin:0 0 22px;
  color:var(--dim);
  font-size:12.5px;
}

/* ---------- 表单元素 ---------- */
.field{ margin-bottom:16px; }
.field label{
  display:flex; align-items:center; gap:6px;
  font-size:11.5px;
  color:var(--dim);
  text-transform:uppercase;
  letter-spacing:0.08em;
  margin-bottom:7px;
}
.field label .icon{ color:var(--dim-2); }

.input-line{
  display:flex;
  align-items:center;
  background:var(--raised);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:0 10px;
  transition:border-color .15s ease;
}
.input-line:focus-within{ border-color:var(--accent); }
.input-line .prefix{ color:var(--dim-2); margin-right:6px; user-select:none; }
.input-line input{
  flex:1;
  background:transparent;
  border:0;
  outline:0;
  color:var(--text);
  padding:10px 2px;
}
.input-line input::placeholder{ color:var(--dim-2); }

.hint{ font-size:11.5px; color:var(--dim); margin-top:6px; }
.err{ font-size:12px; color:var(--danger); margin-top:6px; }

.alert{
  border:1px solid var(--danger);
  background:var(--danger-soft);
  color:#ffb3ae;
  border-radius:var(--radius);
  padding:10px 12px;
  font-size:12.5px;
  margin-bottom:18px;
}
.alert.ok{
  border-color:var(--accent);
  background:var(--accent-soft);
  color:#bdf5d4;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  width:100%;
  background:var(--accent-soft);
  border:1px solid var(--accent);
  color:var(--accent);
  padding:11px 14px;
  border-radius:var(--radius);
  cursor:pointer;
  letter-spacing:0.04em;
  transition:background .15s ease, color .15s ease;
}
.btn:hover{ background:var(--accent); color:#04140a; }
.btn.btn-ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--dim);
}
.btn.btn-ghost:hover{ background:var(--raised-2); color:var(--text); }
.btn.btn-sm{ width:auto; padding:7px 12px; font-size:12.5px; }
.btn.btn-icon{ width:36px; padding:0; height:36px; }

.term-card__foot{
  margin-top:18px;
  font-size:12.5px;
  color:var(--dim);
  text-align:center;
}

/* =========================================================
   聊天主界面布局
   ========================================================= */
.app{
  height:100vh;
  height:100dvh;
  display:grid;
  grid-template-columns:260px 1fr;
  background:var(--bg);
  overflow:hidden;
}

.side{
  border-right:1px solid var(--line);
  background:var(--panel);
  display:flex;
  flex-direction:column;
  min-height:0;
}
.side__head{
  padding:16px 16px 14px;
  border-bottom:1px solid var(--line);
}
.side__head .brand{
  display:flex; align-items:center; gap:8px;
  color:var(--accent);
  font-size:13.5px;
  letter-spacing:0.05em;
}
.side__head .who{
  margin-top:10px;
  display:flex; align-items:center; justify-content:space-between;
  font-size:12px;
  color:var(--dim);
}
.side__head .who .name{ color:var(--text); }
.side__head .who .name .caret-blink{ color:var(--accent); }

.side__search{ padding:12px 14px; border-bottom:1px solid var(--line); }

.nav-group{ padding:8px 8px; }
.nav-group__label{
  padding:8px 8px 4px;
  font-size:10.5px;
  letter-spacing:0.12em;
  color:var(--dim-2);
  text-transform:uppercase;
}
.nav-item{
  display:flex; align-items:center; gap:9px;
  width:100%;
  background:transparent;
  border:1px solid transparent;
  color:var(--dim);
  padding:9px 9px;
  border-radius:var(--radius);
  cursor:pointer;
  text-align:left;
  font-size:13px;
  position:relative;
}
.nav-item .icon{ color:var(--dim-2); }
.nav-item:hover{ background:var(--raised); color:var(--text); }
.nav-item.active{
  background:var(--accent-soft);
  border-color:var(--accent-dim, #1d7a45);
  color:var(--accent);
}
.nav-item.active .icon{ color:var(--accent); }
.nav-item .badge{
  margin-left:auto;
  background:var(--accent-2);
  color:#241a08;
  font-size:10.5px;
  padding:1px 6px;
  border-radius:8px;
  font-weight:600;
}
.nav-item .status-dot{ width:7px; height:7px; border-radius:50%; background:var(--dim-2); flex:none; }
.nav-item .status-dot.online{ background:var(--accent); box-shadow:0 0 5px var(--accent); }

.side__foot{
  margin-top:auto;
  padding:12px;
  border-top:1px solid var(--line);
}

.results{ margin-top:8px; display:flex; flex-direction:column; gap:4px; max-height:180px; overflow:auto; }
.result-item{
  display:flex; align-items:center; gap:8px;
  padding:7px 8px;
  border-radius:var(--radius);
  cursor:pointer;
  font-size:12.5px;
  color:var(--text);
  border:1px solid transparent;
}
.result-item:hover{ border-color:var(--line); background:var(--raised); }
.result-item .rid{ color:var(--dim); font-size:11px; margin-left:auto; }

/* ---------- 主区域 ---------- */
.main{
  display:flex;
  flex-direction:column;
  min-width:0;
  min-height:0;
}
.main__head{
  display:flex; align-items:center; gap:10px;
  padding:14px 20px;
  border-bottom:1px solid var(--line);
  background:var(--panel);
}
.main__head .icon.channel{ color:var(--accent); }
.main__head .icon.channel.dm{ color:var(--accent-2); }
.main__head h2{ margin:0; font-size:14px; font-weight:600; letter-spacing:0.02em; }
.main__head .meta{ margin-left:auto; font-size:11.5px; color:var(--dim); display:flex; align-items:center; gap:6px; }

.thread{
  flex:1;
  overflow-y:auto;
  padding:18px 22px;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.thread__empty{
  margin:auto;
  text-align:center;
  color:var(--dim);
  font-size:12.5px;
}
.thread__empty .icon{ width:28px; height:28px; color:var(--dim-2); margin-bottom:10px; }

.msg{
  display:flex;
  gap:10px;
  padding:6px 8px;
  border-radius:var(--radius);
  max-width:760px;
}
.msg:hover{ background:var(--line-soft); }
.msg .avatar{
  flex:none;
  width:28px; height:28px;
  border-radius:3px;
  background:var(--raised-2);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  color:var(--dim);
  font-size:12px;
  margin-top:2px;
}
.msg.self .avatar{ color:var(--accent); border-color:var(--accent-dim,#1d7a45); }
.msg__body{ min-width:0; }
.msg__meta{ display:flex; align-items:baseline; gap:8px; margin-bottom:2px; }
.msg__name{ font-size:12.5px; color:var(--accent); font-weight:600; }
.msg.self .msg__name{ color:var(--accent); }
.msg__time{ font-size:10.5px; color:var(--dim-2); }
.msg__text{ font-size:13.5px; color:var(--text); white-space:pre-wrap; word-break:break-word; }

/* 消息内图片 */
.msg__text .msg__img{
  display:block;
  max-width:100%;
  max-height:280px;
  border-radius:3px;
  border:1px solid var(--line);
  margin:4px 0;
  cursor:zoom-in;
  background:var(--raised-2);
}
.msg__text .msg__img:hover{ border-color:var(--accent); }

/* 消息内文件 */
.msg__text .msg__file{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 10px;
  margin:4px 0;
  background:var(--raised);
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--accent);
  font-size:12.5px;
  max-width:100%;
  word-break:break-all;
  text-decoration:none;
}
.msg__text .msg__file:hover{ border-color:var(--accent); background:var(--accent-soft); text-decoration:none; }
.msg__text .msg__file .icon{ color:var(--accent-2); }

/* ---------- 加载更早 ---------- */
.load-more{
  position:sticky; top:0;
  z-index:5;
  align-self:center;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--dim);
  font-size:11.5px;
  padding:4px 10px;
  margin:0 auto 8px;
  text-align:center;
  letter-spacing:0.05em;
  opacity:0.85;
  animation:loadMorePulse 2s ease-in-out infinite;
}
@keyframes loadMorePulse{
  0%,100%{ opacity:0.6; }
  50%{ opacity:1; color:var(--accent); }
}

/* ---------- 图片灯箱 ---------- */
.lightbox{
  position:fixed; inset:0;
  background:rgba(4,7,5,0.92);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:200;
  padding:24px;
  cursor:zoom-out;
}
.lightbox.show{ display:flex; }
.lightbox img{
  max-width:100%; max-height:100%;
  object-fit:contain;
  border-radius:3px;
  box-shadow:0 8px 40px rgba(0,0,0,0.6);
  cursor:auto;
}
.lightbox__close{
  position:absolute; top:18px; right:22px;
  width:36px; height:36px;
  display:flex; align-items:center; justify-content:center;
  color:var(--dim);
  font-size:24px;
  cursor:pointer;
  border:1px solid var(--line);
  border-radius:3px;
  background:var(--panel);
  user-select:none;
}
.lightbox__close:hover{ color:var(--text); border-color:var(--accent); }

.day-sep{
  display:flex; align-items:center; gap:10px;
  color:var(--dim-2);
  font-size:11px;
  margin:14px 0 6px;
}
.day-sep::before,.day-sep::after{ content:""; flex:1; height:1px; background:var(--line); }

/* 提示音开关按钮 */
#btnSound.muted{
  color:var(--dim-2);
  opacity:0.55;
}
#btnSound.muted .icon{
  text-decoration:line-through;
}

.sound-menu{
  position:fixed;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:3px;
  padding:12px;
  width:240px;
  box-shadow:0 6px 24px rgba(0,0,0,0.5);
  z-index:200;
  animation: notifPromptIn .15s ease;
}
.sound-menu__title{
  font-size:10.5px;
  letter-spacing:0.12em;
  color:var(--dim-2);
  text-transform:uppercase;
  margin-bottom:10px;
}
.sound-menu__levels{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:4px;
  margin-bottom:12px;
}
.sound-menu__lv{
  background:var(--raised);
  border:1px solid var(--line);
  color:var(--text);
  padding:6px 0;
  border-radius:2px;
  cursor:pointer;
  font-size:12px;
  transition:all .12s;
}
.sound-menu__lv:hover{ border-color:var(--accent); }
.sound-menu__lv.active{
  background:var(--accent);
  color:#0b0f0d;
  border-color:var(--accent);
}
.sound-menu__row{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  color:var(--text);
  cursor:pointer;
  padding:4px 0;
}
.sound-menu__row input{ accent-color:var(--accent); }
.sound-menu__hint{
  font-size:10.5px;
  color:var(--dim-2);
  margin-top:8px;
  padding-top:8px;
  border-top:1px solid var(--line);
}

/* 通知权限请求提示条 */
.notif-prompt{
  position:fixed; left:50%; bottom:24px;
  transform:translateX(-50%);
  background:var(--panel);
  border:1px solid var(--accent);
  border-radius:3px;
  padding:12px 16px;
  display:flex; align-items:center; gap:14px;
  box-shadow:0 4px 24px rgba(0,0,0,0.4);
  z-index:150;
  animation: notifPromptIn .3s ease;
  max-width:92vw;
}
.notif-prompt__text{ font-size:13px; color:var(--text); }
.notif-prompt__actions{ display:flex; gap:6px; }
@keyframes notifPromptIn{
  from{ opacity:0; transform:translateX(-50%) translateY(20px); }
  to  { opacity:1; transform:translateX(-50%) translateY(0); }
}

/* ---------- 输入区 ---------- */
.composer{
  border-top:1px solid var(--line);
  background:var(--panel);
  padding:14px 20px 16px;
  transition:opacity .15s ease;
}
.composer.hidden{ display:none; }
.composer__line{
  display:flex; align-items:flex-end; gap:10px;
  background:var(--raised);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:8px 10px;
}
.composer__line:focus-within{ border-color:var(--accent); }
.composer__prompt{ color:var(--accent); padding:8px 0 8px 2px; user-select:none; }
.composer__line textarea{
  flex:1;
  background:transparent;
  border:0;
  outline:0;
  resize:none;
  color:var(--text);
  padding:8px 4px;
  max-height:120px;
  min-height:20px;
  line-height:1.5;
}
.composer__line textarea::placeholder{ color:var(--dim-2); }
.composer__hint{ margin-top:6px; font-size:11px; color:var(--dim-2); }

.cursor-blink{
  display:inline-block;
  width:7px; height:14px;
  background:var(--accent);
  vertical-align:-2px;
  animation:blink 1s steps(1) infinite;
}
@keyframes blink{ 50%{ opacity:0; } }
@media (prefers-reduced-motion: reduce){ .cursor-blink{ animation:none; } }

/* ---------- 模态：新建私聊 ---------- */
.modal-mask{
  position:fixed; inset:0;
  background:rgba(4,7,5,0.7);
  display:flex; align-items:center; justify-content:center;
  z-index:100;
  padding:16px;
}
.modal-mask[hidden]{ display:none; }
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px;
  width:100%; max-width:380px;
}
.panel__head{ display:flex; align-items:center; margin-bottom:14px; }
.panel__head h3{ margin:0; font-size:13.5px; letter-spacing:0.03em; }
.panel__head .btn-icon{ margin-left:auto; }

.main__head .menu-btn{ display:none; }

/* ---------- 响应式（移动端） ---------- */
@media (max-width: 760px){
  .app{ grid-template-columns:1fr; }

  .side{
    position:fixed; inset:0 auto 0 0;
    width:84%; max-width:320px;
    transform:translateX(-100%);
    transition:transform .2s ease;
    z-index:60;
    box-shadow:2px 0 24px rgba(0,0,0,.5);
    padding-top:env(safe-area-inset-top);
    padding-bottom:env(safe-area-inset-bottom);
  }
  .side.open{ transform:translateX(0); }
  .side-mask{
    position:fixed; inset:0; background:rgba(0,0,0,.55); z-index:50; display:none;
  }
  .side-mask.show{ display:block; }

  .main__head{
    padding:12px 14px;
    padding-top:calc(12px + env(safe-area-inset-top));
    gap:8px;
  }
  .main__head .menu-btn{ display:inline-flex; }
  .main__head h2{ font-size:13.5px; }
  .main__head .meta{ display:none; } /* 移动端隐藏次要信息，节省空间 */

  .thread{ padding:12px 12px 6px; }
  .msg{ max-width:100%; padding:6px 4px; gap:8px; }
  .msg .avatar{ width:26px; height:26px; }

  .composer{
    padding:10px 12px;
    padding-bottom:calc(10px + env(safe-area-inset-bottom));
  }
  .composer__hint{ font-size:10.5px; }

  /* 防止 iOS 聚焦输入框时页面被系统自动放大 */
  .input-line input,
  .composer__line textarea,
  .result-item{ font-size:16px; }

  /* 加大可点击区域，适配触控 */
  .nav-item{ padding:11px 10px; font-size:13.5px; }
  .btn.btn-icon{ width:40px; height:40px; }
  .composer__line .btn.btn-icon{ width:42px; height:42px; }
  .result-item{ padding:10px 8px; }

  .term-card{ padding:24px 18px 22px; }

  .panel{ max-width:100%; margin:0 6px; }
}

/* 极小屏（≤360px）进一步收紧 */
@media (max-width: 360px){
  .side__head{ padding:14px 12px 12px; }
  .thread{ padding:10px 8px 4px; }
  .composer{ padding:8px 8px; }
}

/* ---------- 好友卡片 ---------- */
.friend-card{
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 14px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:border-color .15s ease;
}
.friend-card:hover{ border-color:var(--accent); background:var(--line-soft); }
.friend-card__avatar{
  width:42px; height:42px;
  border-radius:4px;
  background:var(--raised-2);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  color:var(--accent);
  font-size:16px;
  font-weight:600;
  flex:none;
}
.friend-card__info{ flex:1; min-width:0; }
.friend-card__name{ font-size:13.5px; color:var(--text); font-weight:600; margin-bottom:4px; }
.friend-card__meta{
  display:flex; align-items:center; gap:6px;
  font-size:11.5px; color:var(--dim);
}
.friend-card__btn{ flex:none; }

/* ---------- 申请卡片 ---------- */
.request-card{
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:12px 14px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.request-card__avatar{
  width:38px; height:38px;
  border-radius:4px;
  background:var(--raised-2);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  color:var(--accent-2);
  font-size:15px;
  font-weight:600;
  flex:none;
  margin-top:2px;
}
.request-card__info{ flex:1; min-width:0; }
.request-card__name{
  font-size:13px; color:var(--text); font-weight:600; margin-bottom:4px;
  display:flex; align-items:center; gap:6px;
}
.request-card__msg{
  font-size:12px; color:var(--dim);
  margin-bottom:6px;
  word-break:break-word;
}
.request-card__time{ font-size:10.5px; color:var(--dim-2); }
.request-card__actions{
  display:flex; gap:8px; margin-top:8px;
}
.request-card__status{
  flex:none;
  font-size:11px;
  color:var(--dim-2);
  padding:6px 10px;
  background:var(--raised);
  border-radius:var(--radius);
  margin-top:4px;
}

.section-title{
  font-size:12px;
  color:var(--dim);
  text-transform:uppercase;
  letter-spacing:0.08em;
  margin-bottom:10px;
  padding-left:2px;
}