/* =====================================================================
   Mihani AI Chat — ai.mihani-circle.ir
   Dark, ChatGPT-style layout: sidebar + chat + streaming composer.
   ===================================================================== */
:root{
  --bg:#0b0d12; --bg2:#10131a; --panel:#151923; --panel2:#1a1f2c;
  --border:#232a3a; --text:#e8ebf2; --muted:#8b93a7; --dim:#5c6579;
  --accent:#e10a17; --accent2:#ff3b46;
  --user-bubble:#1e2534;
  --radius:14px;
  --sidebar-w:272px;
  --font:"Vazirmatn","Segoe UI",system-ui,-apple-system,sans-serif;
  --mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:var(--font);background:var(--bg);color:var(--text);
  overflow:hidden;-webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea{font-family:inherit;color:inherit}
a{color:var(--accent2)}
img{-webkit-user-drag:none}
::selection{background:rgba(225,10,23,.35)}

/* scrollbars */
*::-webkit-scrollbar{width:8px;height:8px}
*::-webkit-scrollbar-thumb{background:#2a3145;border-radius:99px}
*::-webkit-scrollbar-track{background:transparent}

#app{display:flex;height:100dvh}

/* ============ SIDEBAR ============ */
.sidebar{
  width:var(--sidebar-w);flex-shrink:0;background:var(--bg2);border-inline-end:1px solid var(--border);
  display:flex;flex-direction:column;transition:transform .25s ease;z-index:40;
}
.sb-head{padding:14px 14px 8px}
.sb-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);margin-bottom:14px}
.sb-brand img{width:34px;height:34px;border-radius:9px}
.sb-brand-txt b{display:block;font-size:15px;line-height:1.2}
.sb-brand-txt span{font-size:11px;color:var(--muted)}
.new-chat-btn{
  width:100%;display:flex;align-items:center;gap:8px;justify-content:center;
  background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;
  border-radius:11px;padding:11px 14px;font-weight:700;font-size:14px;
  box-shadow:0 6px 18px rgba(225,10,23,.25);transition:filter .15s,transform .1s;
}
.new-chat-btn:hover{filter:brightness(1.08)}
.new-chat-btn:active{transform:scale(.98)}
.new-chat-btn svg{width:18px;height:18px;fill:currentColor}
.sb-history{flex:1;overflow-y:auto;padding:6px 10px 10px}
.sb-hist-label{font-size:11px;font-weight:700;color:var(--dim);text-transform:uppercase;letter-spacing:.6px;padding:8px 6px 6px}
.sb-empty{color:var(--dim);font-size:13px;padding:10px 6px;text-align:center}
.hist-item{
  display:flex;align-items:center;gap:8px;width:100%;text-align:start;
  padding:9px 10px;border-radius:10px;font-size:13.5px;color:var(--muted);
  transition:background .15s,color .15s;position:relative;
}
.hist-item:hover{background:var(--panel);color:var(--text)}
.hist-item.on{background:var(--panel2);color:var(--text)}
.hist-item .t{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hist-item svg{width:15px;height:15px;fill:currentColor;opacity:.6;flex-shrink:0}
.hist-del{
  opacity:0;padding:4px;border-radius:7px;flex-shrink:0;
}
.hist-item:hover .hist-del{opacity:.7}
.hist-del:hover{opacity:1;background:rgba(225,10,23,.15)}
.hist-del svg{width:14px;height:14px;fill:var(--accent2);opacity:1}
.sb-foot{border-top:1px solid var(--border);padding:12px 14px}
.sb-user{display:flex;align-items:center;gap:10px}
.sb-avatar{
  width:34px;height:34px;border-radius:99px;display:grid;place-items:center;flex-shrink:0;
  background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;font-weight:800;font-size:15px;
}
.sb-user-info{flex:1;min-width:0}
.sb-user-info b{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;direction:ltr;text-align:start}
.sb-user-info span{font-size:11px;color:var(--muted)}
.sb-plan{padding:2px 9px;border-radius:99px;font-size:10px;font-weight:800;color:#fff;background:linear-gradient(160deg,#64748b,#475569)}
.sb-plan.plus{background:linear-gradient(160deg,#8b5cf6,#6d28d9)}
.sb-plan.pro{background:linear-gradient(160deg,#f59e0b,#d97706)}
.sb-logout{padding:7px;border-radius:9px;color:var(--muted)}
.sb-logout:hover{background:var(--panel);color:var(--accent2)}
.sb-logout svg{width:17px;height:17px;fill:currentColor}
.sb-credits{margin-top:10px;font-size:11px;color:var(--dim)}
.sb-credits .bar{height:4px;background:var(--panel2);border-radius:99px;margin-top:5px;overflow:hidden}
.sb-credits .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--accent2),var(--accent));border-radius:99px;transition:width .4s}
.sb-credits .row{display:flex;justify-content:space-between;margin-top:3px}

.sb-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:35;opacity:0;pointer-events:none;transition:opacity .25s}

/* ============ MAIN ============ */
.main{flex:1;display:flex;flex-direction:column;min-width:0;position:relative}

/* topbar */
.topbar{
  display:flex;align-items:center;gap:10px;padding:10px 16px;
  border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--bg) 85%,transparent);
  backdrop-filter:blur(10px);position:relative;z-index:30;
}
.icon-btn{padding:8px;border-radius:10px;color:var(--muted);display:grid;place-items:center;transition:background .15s,color .15s}
.icon-btn:hover{background:var(--panel);color:var(--text)}
.icon-btn svg{width:20px;height:20px;fill:currentColor}
.only-mobile{display:none}

.model-picker{position:relative}
.model-btn{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:11px;transition:background .15s}
.model-btn:hover{background:var(--panel)}
.model-dot{width:8px;height:8px;border-radius:99px;background:#22c55e;box-shadow:0 0 8px #22c55e;animation:pulse 2s infinite}
@keyframes pulse{50%{opacity:.5}}
.model-btn b{font-size:14px}
.model-btn .chev{width:16px;height:16px;fill:var(--muted)}
.model-pop{
  position:absolute;top:calc(100% + 8px);inset-inline-start:0;width:300px;
  background:var(--panel);border:1px solid var(--border);border-radius:14px;
  box-shadow:0 18px 50px rgba(0,0,0,.5);padding:8px;display:none;z-index:60;
}
.model-pop.open{display:block;animation:popIn .18s ease}
@keyframes popIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.model-pop-title{font-size:11px;font-weight:700;color:var(--dim);padding:8px 10px 6px;text-transform:uppercase;letter-spacing:.5px}
.model-item{
  display:flex;align-items:center;gap:10px;width:100%;text-align:start;
  padding:10px 12px;border-radius:10px;font-size:13.5px;transition:background .15s;
}
.model-item:hover{background:var(--panel2)}
.model-item.on{background:var(--panel2)}
.model-item .check{width:16px;height:16px;fill:var(--accent2);opacity:0;flex-shrink:0}
.model-item.on .check{opacity:1}
.model-item .mi-name{font-weight:600;direction:ltr}
.model-item .mi-tag{margin-inline-start:auto;font-size:10px;font-weight:700;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:99px}
.model-item .mi-tag.fast{color:#22c55e}
.topbar-spacer{flex:1}

/* search toggle */
.search-toggle{
  display:flex;align-items:center;gap:7px;padding:8px 14px;border-radius:99px;
  border:1px solid var(--border);color:var(--muted);font-size:13px;font-weight:600;transition:all .2s;
}
.search-toggle:hover{border-color:var(--muted);color:var(--text)}
.search-toggle.on{
  background:color-mix(in srgb,var(--accent) 15%,transparent);border-color:var(--accent);
  color:var(--accent2);
}
.search-toggle svg{width:16px;height:16px;fill:currentColor}

/* ============ CHAT AREA ============ */
.chat-scroll{flex:1;overflow-y:auto;scroll-behavior:smooth}
.chat-scroll::-webkit-scrollbar{width:10px}

.welcome{
  max-width:760px;margin:0 auto;padding:9vh 20px 30px;text-align:center;
}
.welcome-logo{width:74px;height:74px;border-radius:20px;box-shadow:0 16px 44px rgba(225,10,23,.3);animation:bob 4s ease-in-out infinite;margin-bottom:18px}
@keyframes bob{50%{transform:translateY(-8px)}}
.welcome h1{
  font-size:clamp(26px,5vw,38px);font-weight:900;letter-spacing:-.5px;
  background:linear-gradient(120deg,#fff,#ffb3b8,#fff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.welcome p{color:var(--muted);margin-top:8px;font-size:14.5px}
.welcome-cards{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin-top:34px;text-align:start;
}
.wcard{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:14px 16px;transition:border-color .2s,transform .15s,background .2s;
}
.wcard:hover{border-color:#3a4356;transform:translateY(-2px);background:var(--panel2)}
.wcard b{display:block;font-size:14px;margin-bottom:3px}
.wcard span{font-size:12px;color:var(--muted)}

.messages{max-width:760px;margin:0 auto;padding:10px 20px 30px;display:flex;flex-direction:column;gap:22px}

.msg{display:flex;flex-direction:column;animation:msgIn .3s ease}
@keyframes msgIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.msg-user{align-items:flex-end}
.msg-assistant{align-items:flex-start}
.msg-role{font-size:11px;font-weight:700;color:var(--dim);margin-bottom:6px;display:flex;align-items:center;gap:6px}
.msg-assistant .msg-role svg{width:14px;height:14px}
.bubble{
  max-width:100%;line-height:1.75;font-size:15px;word-wrap:break-word;overflow-wrap:break-word;
}
.msg-user .bubble{
  background:var(--user-bubble);border:1px solid var(--border);
  padding:12px 16px;border-radius:18px 18px 5px 18px;max-width:85%;
  white-space:pre-wrap;
}
.msg-assistant .bubble{
  width:100%;
  color:var(--text);
}
.msg-assistant .bubble p{margin:0 0 12px}
.msg-assistant .bubble p:last-child{margin-bottom:0}
.msg-assistant .bubble ul,.msg-assistant .bubble ol{margin:0 0 12px;padding-inline-start:22px}
.msg-assistant .bubble li{margin-bottom:4px}
.msg-assistant .bubble h1,.msg-assistant .bubble h2,.msg-assistant .bubble h3{margin:16px 0 8px;font-size:1.1em}
.msg-assistant .bubble code{
  font-family:var(--mono);font-size:.88em;background:var(--panel2);
  padding:2px 6px;border-radius:6px;direction:ltr;unicode-bidi:embed;
}
.msg-assistant .bubble pre{
  background:#0d1017;border:1px solid var(--border);border-radius:12px;
  padding:14px 16px;overflow-x:auto;direction:ltr;text-align:start;margin:0 0 12px;position:relative;
}
.msg-assistant .bubble pre code{background:none;padding:0;font-size:13px;line-height:1.6;display:block}
.code-wrap{position:relative}
.code-copy{
  position:absolute;top:8px;inset-inline-end:8px;background:var(--panel2);border:1px solid var(--border);
  border-radius:8px;padding:4px 10px;font-size:11px;color:var(--muted);opacity:0;transition:opacity .15s;
}
.code-wrap:hover .code-copy{opacity:1}
.code-copy:hover{color:var(--text)}
.msg-assistant .bubble a{color:var(--accent2);text-decoration:underline}
.msg-assistant .bubble blockquote{border-inline-start:3px solid var(--accent);padding-inline-start:12px;color:var(--muted);margin-bottom:12px}
.msg-assistant .bubble table{border-collapse:collapse;margin-bottom:12px;font-size:13px}
.msg-assistant .bubble th,.msg-assistant .bubble td{border:1px solid var(--border);padding:6px 12px}
.search-badge{
  display:inline-flex;align-items:center;gap:6px;font-size:11px;color:#4da3ff;
  background:rgba(77,163,255,.1);border:1px solid rgba(77,163,255,.25);
  border-radius:99px;padding:3px 10px;margin-bottom:8px;
}
.search-badge svg{width:12px;height:12px;fill:currentColor}

/* typing cursor */
.cursor{display:inline-block;width:8px;height:17px;background:var(--accent2);border-radius:2px;margin-inline-start:2px;vertical-align:text-bottom;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

/* error bubble */
.msg-error .bubble{
  background:rgba(225,10,23,.08);border:1px solid rgba(225,10,23,.3);
  padding:12px 16px;border-radius:12px;color:#ff9ba0;font-size:14px;
}

/* ============ SEARCH STATUS ============ */
.search-status{
  position:absolute;bottom:130px;left:50%;transform:translateX(-50%) translateY(8px);
  display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid rgba(77,163,255,.3);
  color:#9fc9ff;border-radius:99px;padding:8px 18px;font-size:13px;font-weight:600;
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;z-index:20;
  box-shadow:0 10px 30px rgba(0,0,0,.4);
}
.search-status.on{opacity:1;transform:translateX(-50%) translateY(0)}
.search-status .spin{width:15px;height:15px;fill:currentColor;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ============ COMPOSER ============ */
.composer-wrap{padding:0 20px calc(14px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 30%)}
.search-chip{
  display:flex;align-items:center;gap:8px;max-width:760px;margin:0 auto 8px;
  background:rgba(77,163,255,.1);border:1px solid rgba(77,163,255,.3);color:#9fc9ff;
  border-radius:99px;padding:6px 14px;font-size:12.5px;font-weight:600;width:fit-content;
}
.search-chip svg{width:14px;height:14px;fill:currentColor}
.search-chip button{color:inherit;font-size:16px;padding:0 2px;opacity:.7}
.search-chip button:hover{opacity:1}
.composer{
  max-width:760px;margin:0 auto;display:flex;align-items:flex-end;gap:10px;
  background:var(--panel);border:1px solid var(--border);border-radius:22px;
  padding:10px 10px 10px 16px;transition:border-color .2s,box-shadow .2s;
}
.composer:focus-within{border-color:#3d4756;box-shadow:0 0 0 3px rgba(225,10,23,.08)}
#input{
  flex:1;background:none;border:0;outline:none;resize:none;
  font-size:15px;line-height:1.6;max-height:180px;padding:6px 0;
}
#input::placeholder{color:var(--dim)}
.send-btn{
  width:38px;height:38px;border-radius:12px;flex-shrink:0;display:grid;place-items:center;
  background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;
  transition:filter .15s,transform .1s,opacity .2s;
}
.send-btn:disabled{opacity:.35;cursor:default}
.send-btn:not(:disabled):hover{filter:brightness(1.1)}
.send-btn:not(:disabled):active{transform:scale(.94)}
.send-btn svg{width:19px;height:19px;fill:currentColor}
.composer-note{text-align:center;font-size:11px;color:var(--dim);margin-top:8px}

/* ============ AUTH OVERLAY ============ */
.auth-overlay{
  position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(ellipse at 50% 30%,rgba(225,10,23,.12),transparent 60%),rgba(5,6,10,.9);
  backdrop-filter:blur(8px);padding:20px;
}
.auth-card{
  width:min(400px,94vw);background:var(--panel);border:1px solid var(--border);
  border-radius:22px;padding:32px 28px;box-shadow:0 30px 80px rgba(0,0,0,.6);text-align:center;
  animation:msgIn .35s ease;
}
.auth-logo{width:60px;height:60px;border-radius:16px;margin-bottom:14px;box-shadow:0 12px 30px rgba(225,10,23,.3)}
.auth-card h2{font-size:21px;font-weight:800;margin-bottom:5px}
.auth-sub{color:var(--muted);font-size:13.5px;margin-bottom:20px}
.auth-tabs{display:flex;gap:4px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:4px;margin-bottom:18px}
.auth-tab{flex:1;padding:9px;border-radius:9px;font-size:13.5px;font-weight:700;color:var(--muted);transition:all .2s}
.auth-tab.on{background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff}
.auth-card form{display:none;flex-direction:column;gap:11px}
.auth-card form.on{display:flex;animation:msgIn .25s ease}
.auth-card input{
  background:var(--bg);border:1px solid var(--border);border-radius:12px;
  padding:12px 15px;font-size:14px;outline:none;direction:ltr;text-align:start;transition:border-color .2s;
}
.auth-card input:focus{border-color:var(--accent)}
.auth-card form button[type=submit]{
  background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;
  border-radius:12px;padding:12px;font-weight:700;font-size:14px;transition:filter .15s;
}
.auth-card form button[type=submit]:hover{filter:brightness(1.08)}
.auth-msg{font-size:12.5px;font-weight:600;min-height:16px}
.auth-msg.ok{color:#22c55e}
.auth-msg.bad{color:#ff6b70}

/* toast */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);
  background:var(--panel2);border:1px solid var(--border);color:var(--text);
  border-radius:12px;padding:11px 20px;font-size:13.5px;font-weight:600;z-index:200;
  transition:transform .3s;box-shadow:0 12px 40px rgba(0,0,0,.5);max-width:90vw;
}
.toast.on{transform:translateX(-50%) translateY(0)}
.toast.bad{border-color:rgba(225,10,23,.4);color:#ff9ba0}

/* ============ RESPONSIVE ============ */
@media (max-width:820px){
  .sidebar{position:fixed;top:0;bottom:0;inset-inline-start:0;transform:translateX(100%)}
  [dir="ltr"] .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .sb-backdrop.on{opacity:1;pointer-events:auto}
  .only-mobile{display:grid}
  .search-toggle span{display:none}
  .search-toggle{padding:8px}
  .welcome{padding-top:5vh}
  .messages{padding:10px 14px 20px}
  .composer-wrap{padding:0 12px calc(10px + env(safe-area-inset-bottom))}
  .msg-user .bubble{max-width:92%}
}