:root{
  --ink:#0F3D5C; --ink-2:#1565A8; --sky:#5EB8FF; --sky-deep:#2E86C9;
  --paper:#F4F8FC; --card:#fff;
  --text:#142A3D; --muted:#5A7186; --line:#D4E4F2; --danger:#B3261E; --ok:#1E7A55;
  --radius:12px;
  --shell-split:minmax(340px,1fr) minmax(360px,1fr);
}
@media (prefers-color-scheme: dark){
  :root{ --paper:#0B1520; --card:#122232; --text:#E6F2FA; --muted:#8FA8BE; --line:#243848; --danger:#FF8A80; }
}
*{box-sizing:border-box;margin:0}
html,body{height:100%}
body{font-family:'Inter',system-ui,sans-serif;background:var(--paper);color:var(--text);-webkit-font-smoothing:antialiased}
.shell{display:grid;grid-template-columns:var(--shell-split);min-height:100%;max-width:1600px;margin:0 auto}

/* —— Brand panel: full-bleed hero + bottom copy —— */
.brand{position:relative;min-height:100%;background:var(--ink);color:#fff;overflow:hidden}
.brand__backdrop{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 35%}
.brand::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(105deg,rgba(15,61,92,.72) 0%,rgba(15,61,92,.25) 45%,rgba(15,61,92,.08) 70%),
             linear-gradient(0deg,rgba(8,28,44,.92) 0%,rgba(8,28,44,.5) 38%,transparent 68%);
}
.brand__insets{
  position:absolute;z-index:2;top:clamp(24px,4vw,48px);right:clamp(20px,3vw,40px);
  display:flex;gap:10px;
}
.brand__insets img{
  width:clamp(72px,10vw,104px);height:clamp(54px,7.5vw,78px);
  object-fit:cover;border-radius:10px;border:2px solid rgba(255,255,255,.35);
  box-shadow:0 8px 24px rgba(0,0,0,.35);
}
.brand__content{
  position:absolute;z-index:2;left:0;right:0;bottom:0;
  padding:clamp(28px,4vw,52px) clamp(28px,4vw,56px);
  max-width:28rem;
}
.brand__app{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.72);margin-bottom:10px}
.brand__venue{
  font-family:'Cormorant Garamond',Georgia,serif;
  font-size:clamp(36px,4.5vw,52px);font-weight:700;line-height:1.05;
  letter-spacing:.01em;margin-bottom:14px;
}
.brand__line{font-size:15px;line-height:1.55;font-weight:500;color:rgba(255,255,255,.88);max-width:22em}

/* —— Sign-in panel —— */
.panel{
  display:flex;align-items:center;justify-content:center;
  padding:clamp(24px,4vw,48px);
  background:var(--paper);
  border-left:1px solid var(--line);
}
.panel__inner{width:min(420px,100%)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:clamp(32px,4vw,44px) clamp(24px,3vw,40px);
  box-shadow:0 4px 6px rgba(15,61,92,.04),0 20px 50px rgba(46,134,201,.1);
}
.step{display:none}.step.is-active{display:block}
h1{font-weight:700;font-size:26px;line-height:1.25;margin-bottom:8px;color:var(--ink)}
.lead{color:var(--muted);font-size:15px;line-height:1.55;margin-bottom:26px}
.lead strong{color:var(--text)}
label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}
input[type=email]{
  width:100%;height:50px;padding:0 14px;font:inherit;font-size:16px;color:var(--text);
  background:#fff;border:1.5px solid var(--line);border-radius:var(--radius);
  transition:border-color .15s,box-shadow .15s;
}
input:focus-visible,.btn:focus-visible,.link:focus-visible{
  outline:none;border-color:var(--sky-deep);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--sky) 35%,transparent);
}
.is-invalid{border-color:var(--danger)!important}
.error{min-height:20px;margin:8px 0 14px;font-size:13px;color:var(--danger)}
.success{min-height:20px;margin:8px 0 14px;font-size:14px;font-weight:600;color:var(--ok)}

.otp{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;max-width:280px}
.otp__box{
  width:100%;height:52px;text-align:center;font:700 20px 'Inter',sans-serif;color:var(--text);
  background:#fff;border:1.5px solid var(--line);border-radius:var(--radius);
}
.otp__box.filled{border-color:var(--sky-deep)}
.otp.shake{animation:shake .35s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

.btn{
  position:relative;width:100%;height:50px;border:0;border-radius:var(--radius);
  background:linear-gradient(135deg,var(--sky-deep),var(--ink-2));color:#fff;
  font:600 16px 'Inter',sans-serif;cursor:pointer;margin-top:4px;
}
.btn:hover{filter:brightness(1.05)}
.btn:disabled{opacity:.7;cursor:progress}
.spinner{
  display:none;width:20px;height:20px;border:2.5px solid rgba(255,255,255,.4);
  border-top-color:#fff;border-radius:50%;position:absolute;inset:0;margin:auto;
  animation:spin .7s linear infinite;
}
.btn.loading .btn__text{visibility:hidden}.btn.loading .spinner{display:block}
@keyframes spin{to{transform:rotate(360deg)}}

.links{display:flex;justify-content:space-between;gap:12px;margin-top:20px;flex-wrap:wrap}
.link{background:none;border:0;padding:4px 0;font:600 14px 'Inter',sans-serif;color:var(--sky-deep);cursor:pointer;border-radius:6px}
.link:disabled{color:var(--muted);cursor:default}
.link:not(:disabled):hover{text-decoration:underline}

.tick{width:56px;height:56px;border-radius:50%;background:var(--ok);color:#fff;display:grid;place-items:center;margin-bottom:20px}
.foot{font-size:13px;color:var(--muted);text-align:center;margin-top:20px;line-height:1.45}

/* —— Unauthorized / access denied —— */
.auth-denied{text-align:left}
.auth-denied__meta{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:18px;
  font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
}
.auth-denied__code{
  display:inline-grid;place-items:center;min-width:2rem;height:1.35rem;padding:0 6px;
  border-radius:6px;font-size:10px;font-weight:800;letter-spacing:.04em;
  color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,var(--card));
  border:1px solid color-mix(in srgb,var(--danger) 28%,var(--line));
}
.auth-denied__badge{
  width:64px;height:64px;border-radius:50%;margin-bottom:18px;
  display:grid;place-items:center;color:var(--danger);
  background:color-mix(in srgb,var(--danger) 10%,var(--card));
  border:1px solid color-mix(in srgb,var(--danger) 22%,var(--line));
  box-shadow:0 8px 24px color-mix(in srgb,var(--danger) 12%,transparent);
}
.auth-denied__badge .bi{font-size:32px;line-height:1}
.auth-denied__session{
  font-size:14px;color:var(--muted);margin:-12px 0 18px;line-height:1.5;
}
.auth-denied__session strong{color:var(--text);font-weight:600}
.auth-denied__tips{
  margin:0 0 22px;padding:14px 16px 14px 2rem;border-radius:var(--radius);
  background:color-mix(in srgb,var(--sky) 10%,var(--card));
  border:1px solid var(--line);font-size:14px;line-height:1.55;color:var(--muted);list-style:disc;
}
.auth-denied__tips li{margin-bottom:6px}
.auth-denied__tips li:last-child{margin-bottom:0}
.auth-denied__actions{display:flex;flex-direction:column;gap:10px}
.auth-denied__actions form{margin:0}
.btn--ghost{
  display:inline-flex;align-items:center;justify-content:center;width:100%;height:50px;
  border-radius:var(--radius);border:1.5px solid var(--line);background:var(--card);
  color:var(--sky-deep);font:600 16px 'Inter',sans-serif;text-decoration:none;
  transition:border-color .15s,background .15s;
}
.btn--ghost:hover{background:color-mix(in srgb,var(--sky) 8%,var(--card));border-color:var(--sky-deep)}
a.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;margin-top:4px}
a.btn[hidden]{display:none!important}

@media (max-width:900px){
  .shell{grid-template-columns:1fr;max-width:none}
  .brand{min-height:min(48vh,380px)}
  .brand__content{max-width:none;padding:22px 24px 28px}
  .brand__insets{top:16px;right:16px}
  .brand__insets img{width:64px;height:48px}
  .panel{border-left:0;border-top:1px solid var(--line)}
}
@media (min-width:901px){
  .brand{min-height:100vh}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}