:root{
  --bg:#0A0908; --card:#131117; --field:#1D1C24;
  --border:rgba(255,255,255,.09); --border-hover:rgba(255,255,255,.16);
  --text-1:#F5EFE8; --text-2:#A79B8F; --text-3:#6E6357;
  --accent:#FF8A3D; --danger:#FF4D6D; --success:#3ECF8E;
  --grad:linear-gradient(135deg,#FFB454,#FF7A3D);
  --grad-vivid:linear-gradient(135deg,#FFB454 0%,#FF7A3D 45%,#FF4D6D 100%);
  --grad-text:linear-gradient(180deg,#F5EFE8 0%,#C9BCAD 100%);
  --m1:rgba(109,91,208,.22); --m2:rgba(120,110,245,.13); --m3:rgba(255,138,61,.16);
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,monospace;
  --font-logo:'Archivo',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-body);background:var(--bg);color:var(--text-1);-webkit-font-smoothing:antialiased;min-height:100vh}

/* ---------- page backdrop ---------- */
.auth-bg{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:40px 20px;position:relative;overflow:hidden}
.auth-bg::before{content:"";position:fixed;inset:0;z-index:0;
  background:
    radial-gradient(50% 45% at 14% 12%, var(--m1) 0%, transparent 70%),
    radial-gradient(45% 40% at 86% 88%, var(--m3) 0%, transparent 70%),
    radial-gradient(35% 35% at 60% 24%, var(--m2) 0%, transparent 70%);}

/* ---------- centered split card ---------- */
.auth-card{position:relative;z-index:1;width:100%;max-width:880px;display:grid;grid-template-columns:1fr 1fr;background:var(--card);border:1px solid var(--border);border-radius:22px;overflow:hidden;box-shadow:0 42px 110px rgba(0,0,0,.55)}

/* ---------- left: illustration side ---------- */
.card-side{position:relative;padding:36px 32px;display:flex;flex-direction:column;overflow:hidden;
  background:
    radial-gradient(90% 65% at 18% 12%, rgba(255,138,61,.13) 0%, transparent 80%),
    radial-gradient(80% 60% at 88% 88%, rgba(109,91,208,.13) 0%, transparent 80%),
    #0B0908;}
.card-side::after{content:"";position:absolute;inset:0;
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:40px 40px;opacity:.45;
  -webkit-mask-image:radial-gradient(ellipse 85% 75% at 40% 42%,#000 0%,transparent 82%);
          mask-image:radial-gradient(ellipse 85% 75% at 40% 42%,#000 0%,transparent 82%);}
.side-inner{position:relative;z-index:1;display:flex;flex-direction:column;height:100%}
.logo{display:flex;align-items:center;gap:10px}
.logo-text{font-family:var(--font-logo);font-weight:800;font-size:16px;letter-spacing:-.02em;display:flex;align-items:baseline}
.logo-text .lw2{background:var(--grad-vivid);-webkit-background-clip:text;background-clip:text;color:transparent}
.illus-wrap{flex:1;position:relative;min-height:0;margin:16px 0}
.illus{width:100%;max-width:300px;height:auto;filter:drop-shadow(0 20px 40px rgba(255,122,61,.18))}
.side-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;border-radius:16px;border:1px solid var(--border);box-shadow:0 24px 60px rgba(0,0,0,.45)}
.side-tagline{text-align:center}
.side-tagline h3{font-size:17px;font-weight:600;letter-spacing:-.01em;margin-bottom:6px}
.side-tagline p{color:var(--text-2);font-size:12.5px;line-height:1.5}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
.f1{animation:floaty 5s ease-in-out infinite}
.f2{animation:floaty 6s ease-in-out infinite;animation-delay:-2s}
.f3{animation:floaty 5.5s ease-in-out infinite;animation-delay:-1s}
.f4{animation:floaty 6.5s ease-in-out infinite;animation-delay:-3s}
.hub{animation:floaty 7s ease-in-out infinite}

/* ---------- right: form side ---------- */
.card-form{padding:46px 48px;display:flex;flex-direction:column;justify-content:center;background:var(--card)}
.card-form h1{font-size:24px;font-weight:600;letter-spacing:-.02em;margin-bottom:6px}
.card-form .sub{color:var(--text-2);font-size:13.5px;margin-bottom:28px}
.field{margin-bottom:16px}
.field label{display:block;font-size:12.5px;font-weight:500;color:var(--text-2);margin-bottom:6px}
.input-wrap{position:relative}
.input-wrap input{width:100%;background:var(--field);border:1px solid var(--border);border-radius:11px;padding:11px 40px 11px 13px;color:var(--text-1);font-size:13.5px;font-family:inherit;transition:border-color .18s ease,background .18s ease}
.input-wrap input::placeholder{color:var(--text-3)}
.input-wrap input:hover{border-color:var(--border-hover)}
.input-wrap input:focus{outline:none;border-color:rgba(255,138,61,.5);background:#1a1921}
.eye{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-3);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:7px;border-radius:8px;transition:color .15s}
.eye:hover{color:var(--text-1)}
.eye.on{color:var(--accent)}
.err{color:var(--danger);font-size:12px;margin-top:6px}

/* checklist — reveal on typing */
.checklist{max-height:0;opacity:0;overflow:hidden;transition:max-height .3s ease,opacity .3s ease,margin .3s ease;margin-top:0}
.checklist.visible{max-height:130px;opacity:1;margin-top:11px}
.req{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--text-3);transition:color .2s;padding:2px 0}
.req .icon{width:15px;height:15px;border-radius:50%;border:1px solid var(--border);display:inline-flex;align-items:center;justify-content:center;font-size:9px;line-height:1;flex:0 0 auto;transition:all .2s}
.req.ok{color:var(--success)}
.req.ok .icon{border-color:var(--success);color:var(--success);background:rgba(62,207,142,.12)}
.req.bad{color:var(--danger)}
.req.bad .icon{border-color:var(--danger);color:var(--danger);background:rgba(255,77,109,.12)}

.btn{width:100%;font-family:inherit;font-size:14px;font-weight:600;color:#1A0D02;background:var(--grad);border:none;border-radius:11px;padding:12px;cursor:pointer;margin-top:6px;box-shadow:0 6px 20px rgba(255,138,61,.28);transition:transform .15s,filter .15s}
.btn:hover{transform:translateY(-1px);filter:brightness(1.05)}
.foot{color:var(--text-3);font-size:12.5px;text-align:center;margin-top:20px}
.foot a{color:var(--accent);text-decoration:none;font-weight:500}
.foot a:hover{text-decoration:underline}

/* ---------- mobile ---------- */
.mobile-brand{display:none}
@media (max-width:760px){
  .auth-bg{padding:24px 16px;align-items:flex-start}
  .auth-card{grid-template-columns:1fr;max-width:420px;border-radius:18px}
  .card-side{display:none}
  .card-form{padding:30px 22px;min-height:0}
  .mobile-brand{display:flex;align-items:center;gap:9px;margin-bottom:26px}
  .mb-mark{width:10px;height:10px;border-radius:3px;background:var(--grad-vivid);box-shadow:0 0 10px rgba(255,138,61,.5)}
}

/* ---------- modal close (back to home) ---------- */
.close{
  position:fixed;top:20px;right:20px;z-index:20;
  width:42px;height:42px;border-radius:50%;
  background:var(--card);border:1px solid var(--border);
  color:var(--text-2);display:flex;align-items:center;justify-content:center;
  cursor:pointer;text-decoration:none;
  transition:color .2s,border-color .2s,transform .25s,background .2s;
}
.close:hover{color:var(--text-1);border-color:var(--border-hover);transform:rotate(90deg)}

/* ---------- language toggle (fixed top-left) ---------- */
.lang-wrap{position:fixed;top:20px;left:20px;z-index:20}
.lang-toggle{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:999px;border:1px solid var(--border);color:var(--text-2);text-decoration:none;font-size:12px;font-weight:700;letter-spacing:.04em;line-height:1;white-space:nowrap;transition:color .2s,border-color .2s,background .2s}
.lang-toggle:hover{color:var(--text-1);border-color:var(--accent);background:rgba(255,255,255,.03)}
.lang-flag{font-size:15px;line-height:1}
.lang-code{line-height:1}

/* ---------- RTL (Persian) ---------- */
html[lang="fa"]{--font-body:'iranyekan','Inter',system-ui,sans-serif}
html[lang="fa"] .card-form h1,html[lang="fa"] .side-tagline h3{letter-spacing:0}