:root{
  --bg:#0f172a;
  --bg2:#111827;
  --card:rgba(255,255,255,.08);
  --card-strong:rgba(255,255,255,.11);
  --line:rgba(255,255,255,.10);
  --text:#e5e7eb;
  --muted:#9ca3af;
  --primary:#f43f5e;
  --primary-2:#fb7185;
  --blue:#38bdf8;
  --green:#22c55e;
  --warning:#fbbf24;
  --shadow:0 24px 80px rgba(2,6,23,.45);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Inter,Arial,Helvetica,sans-serif;background:radial-gradient(circle at top,#1f2937 0,#111827 38%,#0b1120 100%);color:var(--text)}
a{text-decoration:none;color:inherit}
button{cursor:pointer;border:none}
.no-select{-webkit-user-select:none;-moz-user-select:none;user-select:none}
.glass-card{background:linear-gradient(180deg,rgba(255,255,255,.10),rgba(255,255,255,.05));backdrop-filter:blur(14px);border:1px solid var(--line);box-shadow:var(--shadow)}
.alert{max-width:1220px;margin:16px auto 0;padding:14px 16px;border-radius:16px}
.error{background:#7f1d1d}
.success{background:#14532d}

.landing-body{min-height:100vh;padding:24px}
.landing-shell{max-width:1220px;margin:0 auto;display:flex;flex-direction:column;gap:22px}
.hero-card{border-radius:32px;padding:34px;position:relative;overflow:hidden}
.hero-card:before{content:"";position:absolute;inset:auto -10% -45% auto;width:340px;height:340px;background:radial-gradient(circle,var(--primary) 0,transparent 70%);opacity:.25;filter:blur(20px)}
.top-chip{display:inline-flex;padding:9px 14px;border:1px solid rgba(255,255,255,.16);border-radius:999px;font-size:12px;color:#cbd5e1;background:rgba(255,255,255,.05)}
.led-board{margin-top:18px;font-size:clamp(42px,9vw,104px);font-weight:900;letter-spacing:12px;color:#ffd166;text-shadow:0 0 6px #ffd166,0 0 18px #f59e0b,0 0 32px #ef4444;animation:ledPulse 1.3s infinite alternate}
@keyframes ledPulse{from{opacity:.78;filter:brightness(.95)}to{opacity:1;filter:brightness(1.18)}}
.hero-title{font-size:clamp(28px,4vw,54px);line-height:1.08;margin:14px 0 10px;max-width:860px}
.hero-desc{max-width:820px;color:#cbd5e1;font-size:16px;line-height:1.7}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.hero-badges span{padding:10px 14px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#f3f4f6}
.modern-note{margin-top:18px;color:#e2e8f0}
.auth-modern-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.auth-modern-card{padding:26px;border-radius:28px}
.card-topline{font-size:12px;text-transform:uppercase;letter-spacing:1.4px;color:#fda4af;margin-bottom:10px}
.auth-modern-card h2{font-size:34px;margin:0 0 10px}
.form-desc{margin:0 0 18px;color:#cbd5e1;line-height:1.6}
label{display:block;font-size:14px;color:#dbe4f0;margin:14px 0 8px}
input[type=text],input[type=file]{width:100%;padding:16px 18px;border-radius:18px;border:1px solid rgba(255,255,255,.12);background:rgba(15,23,42,.82);color:#fff;outline:none}
input[type=text]:focus,input[type=file]:focus{border-color:rgba(244,63,94,.7);box-shadow:0 0 0 4px rgba(244,63,94,.16)}
.btn-primary,.archive-btn,.logout-btn{display:inline-flex;align-items:center;justify-content:center;padding:15px 20px;border-radius:18px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;margin-top:18px;box-shadow:0 15px 35px rgba(244,63,94,.25)}
.btn-dark{background:linear-gradient(135deg,#111827,#1f2937)}
.btn-soft{margin-top:0;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);box-shadow:none}

.chat-body{height:100vh;overflow:hidden}
.chat-fullscreen{height:100vh;padding:14px;display:grid;grid-template-rows:auto auto 1fr auto;gap:12px}
.chat-topbar,.online-strip,.messages-full,.composer-modern{border-radius:24px}
.chat-topbar{padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.brand-cluster{display:flex;align-items:center;gap:14px}.brand-badge{width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),#7c3aed);font-weight:900;font-size:20px;box-shadow:0 12px 28px rgba(244,63,94,.28)}
.chat-app-name{font-weight:900;font-size:20px;letter-spacing:1.8px}.chat-app-sub{font-size:12px;color:var(--muted)}
.chat-top-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}.me-pill{padding:10px 14px;border-radius:18px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);display:flex;flex-direction:column;gap:3px}.me-pill small{color:#cbd5e1}
.online-strip{padding:12px 14px;display:flex;flex-direction:column;gap:10px;overflow:hidden}.online-strip-head{font-size:13px;color:#fda4af;font-weight:700;text-transform:uppercase;letter-spacing:1px}
.user-pills{display:flex;gap:10px;overflow:auto;padding-bottom:4px}.user-pills::-webkit-scrollbar,.messages-full::-webkit-scrollbar{height:8px;width:8px}.user-pills::-webkit-scrollbar-thumb,.messages-full::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:999px}
.user-pill{min-width:210px;padding:12px 14px;border-radius:18px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08)}.user-pill.active{outline:2px solid rgba(56,189,248,.5)}.user-pill-name{font-weight:700}.user-pill-meta{margin-top:5px;font-size:12px;color:#cbd5e1;display:flex;align-items:center;gap:6px}.on-dot,.off-dot{width:8px;height:8px;border-radius:999px;display:inline-block}.on-dot{background:var(--green);box-shadow:0 0 10px var(--green)}.off-dot{background:#64748b}
.messages-full{padding:18px;overflow:auto;display:flex;flex-direction:column;gap:14px;background:linear-gradient(180deg,rgba(15,23,42,.85),rgba(17,24,39,.94))}
.msg-row{display:flex;gap:12px;align-items:flex-end;max-width:min(80%,860px)}.msg-row.mine{margin-left:auto;flex-direction:row-reverse}.msg-avatar{width:40px;height:40px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#1e293b,#334155);font-weight:800;flex:0 0 auto}.msg-stack{display:flex;flex-direction:column;gap:5px;min-width:0}.msg-headline{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.sender{font-size:14px;font-weight:800}.time-sm{font-size:11px;color:#94a3b8}
.bubble-modern{padding:14px 16px;border-radius:22px 22px 22px 8px;background:linear-gradient(180deg,#1f2937,#111827);border:1px solid rgba(255,255,255,.08);word-break:break-word;line-height:1.55}.bubble-modern.mine{border-radius:22px 22px 8px 22px;background:linear-gradient(135deg,#f43f5e,#be123c)}
.msg-text{white-space:pre-wrap}.msg-meta-line{min-height:20px;display:flex;align-items:center;gap:8px}.read-flag{font-size:16px}.verified{display:inline-flex;align-items:center;justify-content:center;background:#ef4444;color:#fff;border-radius:999px;padding:0 6px;min-width:18px;height:18px;font-size:11px;font-weight:900;vertical-align:middle}.stars{color:var(--warning);font-size:13px;letter-spacing:1px}
.file-card{display:inline-flex;align-items:center;gap:8px;padding:10px 12px;border-radius:16px;background:rgba(255,255,255,.12);margin-bottom:8px}.file-card a{color:#fff;text-decoration:underline}
.composer-modern{padding:10px;display:grid;grid-template-columns:56px 160px 1fr 140px;align-items:center;gap:10px}.file-pick{height:52px;border-radius:18px;display:grid;place-items:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);font-size:24px;cursor:pointer}.composer-modern #fileInput{padding:13px 12px}.send-btn{height:52px;margin-top:0}
.archive-wrap{max-width:1120px;margin:20px auto;padding:20px;border-radius:28px}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.archive-list{display:flex;flex-direction:column;gap:12px;margin-top:18px}.archive-item{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px;border-radius:16px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08)}.archive-name{font-weight:700}.archive-meta{font-size:13px;color:#cbd5e1}

@media (max-width:980px){
  .landing-body{padding:16px}
  .auth-modern-grid{grid-template-columns:1fr}
  .chat-fullscreen{padding:10px;grid-template-rows:auto auto 1fr auto}
  .chat-topbar{padding:14px;align-items:flex-start;flex-direction:column}
  .chat-top-actions{width:100%;justify-content:space-between}
  .msg-row{max-width:100%}
  .composer-modern{grid-template-columns:52px 1fr;grid-template-areas:'pick text' 'file send'}
  .file-pick{grid-area:pick}
  .composer-modern #messageInput{grid-area:text}
  .composer-modern #fileInput{grid-area:file}
  .composer-modern .send-btn{grid-area:send}
}


.simple-topbar{padding:10px 12px}.full-width-actions{width:100%;display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:10px;align-items:center}.compact-chat-layout{grid-template-rows:auto auto minmax(0,1fr) auto}.composer-mobile-safe{padding-bottom:calc(10px + env(safe-area-inset-bottom,0px))}.archive-link{padding:10px 14px;border-radius:14px}
@media (max-width:980px){
  .chat-body{height:100dvh;overflow:hidden}
  .compact-chat-layout{height:100dvh;padding:8px;gap:8px;grid-template-rows:auto auto minmax(0,1fr) auto}
  .simple-topbar{padding:8px 10px}
  .full-width-actions{grid-template-columns:1fr 110px 110px;gap:8px}
  .me-pill{padding:8px 10px;min-width:0}
  .me-pill span{font-size:14px;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .me-pill small{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .online-strip{padding:10px;gap:8px}
  .user-pills{gap:8px}
  .user-pill{min-width:170px;padding:10px 12px}
  .messages-full{padding:12px;gap:10px;min-height:0}
  .msg-row{gap:8px}
  .msg-avatar{width:34px;height:34px;border-radius:12px;font-size:14px}
  .bubble-modern{padding:12px 14px}
  .time-sm{font-size:10px}
  .composer-modern{padding:8px;gap:8px;grid-template-columns:48px 1fr 88px;grid-template-areas:'pick text send' 'file file file';align-items:center}
  .composer-modern #fileInput{grid-area:file;padding:10px 12px;font-size:12px}
  .composer-modern #messageInput{grid-area:text;min-width:0;padding:14px 14px}
  .composer-modern .send-btn{grid-area:send;height:48px;padding:12px 10px;font-size:14px}
  .file-pick{height:48px;border-radius:16px;font-size:22px}
}
@media (max-width:420px){
  .full-width-actions{grid-template-columns:1fr 90px 90px}
  .archive-btn,.logout-btn{padding:13px 10px;font-size:13px}
  .composer-modern{grid-template-columns:44px 1fr 82px}
  .file-pick{height:44px}
  .composer-modern .send-btn{height:44px;font-size:13px}
}