:root {
  color-scheme: dark;
  --gold: #cfb87c;
  --paper: #f8f3e7;
  --ink: #080808;
  --line: rgba(255,255,255,.28);
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--ink); -webkit-text-size-adjust: 100%; }
body { margin: 0; color: #fff; background: var(--ink); font-family: Arial, Helvetica, sans-serif; }
a { color: inherit; }

.signal-door { position: relative; isolation: isolate; display: grid; grid-template-rows: auto 1fr auto; min-height: 100vh; min-height: 100dvh; overflow: hidden; background: #080808; }
.signal-door__art { position: absolute; inset: 0; z-index: -3; width: 100%; height: 100%; object-fit: cover; object-position: 50% 53%; animation: signal-breathe 18s ease-out both; }
.signal-door__shade { position: absolute; inset: 0; z-index: -2; background: linear-gradient(180deg,rgba(0,0,0,.78),rgba(0,0,0,.08) 34%,rgba(0,0,0,.18) 58%,rgba(0,0,0,.94)),linear-gradient(90deg,rgba(0,0,0,.42),transparent 48%,rgba(0,0,0,.2)); }
.signal-door::after { position: absolute; inset: 0; z-index: -1; opacity: .15; background: radial-gradient(rgba(255,255,255,.32) .65px,transparent .8px); background-size: 6px 6px; content: ''; pointer-events: none; }

.signal-door__mast { display: flex; justify-content: space-between; gap: 24px; padding: max(22px,env(safe-area-inset-top)) clamp(20px,4vw,62px) 20px; border-bottom: 1px solid var(--line); font-weight: 800; letter-spacing: .12em; text-shadow: 0 3px 18px #000; }
.signal-door__mast a { display: grid; gap: 4px; text-decoration: none; }
.signal-door__mast strong { color: var(--gold); font-size: .8rem; }
.signal-door__mast span,.signal-door__mast p { margin: 0; font-size: .64rem; }

.signal-door__story { align-self: end; max-width: 940px; padding: 44px clamp(20px,4vw,62px) clamp(226px,23vh,286px); text-shadow: 0 5px 30px #000; }
.signal-door__story>p { margin: 0; color: var(--gold); font-size: .69rem; font-weight: 900; letter-spacing: .16em; }
.signal-door__story h1 { margin: 14px 0 20px; font-size: clamp(4.6rem,9.5vw,10rem); line-height: .76; letter-spacing: -.075em; text-transform: uppercase; }
.signal-door__story h1 em { color: var(--paper); font-style: normal; }
.signal-door__story>span { display: block; max-width: 620px; color: rgba(255,255,255,.9); font-size: clamp(.95rem,1.4vw,1.2rem); line-height: 1.55; }
.signal-door__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 27px; text-shadow: none; }
.signal-door__actions a { min-height: 48px; padding: 15px 17px; font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; }
.signal-door__enter { display: flex; justify-content: space-between; gap: 42px; min-width: 260px; color: #111; background: var(--gold); border: 1px solid #efda9e; }
.signal-door__student { color: #fff; background: rgba(0,0,0,.63); border: 1px solid rgba(255,255,255,.42); backdrop-filter: blur(12px); }
.signal-door__actions a:hover { transform: translateY(-2px); }
.signal-door__actions a:focus-visible,.signal-door__mast a:focus-visible,.signal-door__opener a:focus-visible { outline: 3px solid #fff; outline-offset: 4px; }

.signal-door__offer { position: absolute; right: clamp(20px,4vw,62px); bottom: 94px; z-index: 3; display: grid; gap: 8px; width: min(390px,37vw); padding: 20px; color: #17130b; background: rgba(248,243,231,.96); border-top: 6px solid var(--gold); box-shadow: 0 22px 70px rgba(0,0,0,.46); }
.signal-door__offer>span { color: #725d24; font-size: .59rem; font-weight: 900; letter-spacing: .13em; }
.signal-door__offer>strong { font-family: Georgia,"Times New Roman",serif; font-size: clamp(1.5rem,2.2vw,2.15rem); line-height: .94; letter-spacing: -.04em; }
.signal-door__offer>p { margin: 2px 0 5px; color: #5b5549; font-size: .73rem; line-height: 1.45; }
.signal-door__offer>a { display: flex; justify-content: space-between; gap: 20px; min-height: 43px; align-items: center; padding: 0 12px; color: #fff; background: #111; font-size: .65rem; font-weight: 900; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; }
.signal-door__offer>a:hover { color: #111; background: var(--gold); }

.signal-door__opener { position: absolute; left: clamp(20px,4vw,62px); bottom: 94px; display: grid; gap: 8px; width: min(340px,35vw); padding: 18px; color: #16120b; background: rgba(248,243,231,.94); border-top: 6px solid var(--gold); box-shadow: 0 22px 70px rgba(0,0,0,.42); }
.signal-door__opener span { color: #705c27; font-size: .62rem; font-weight: 900; letter-spacing: .11em; }
.signal-door__opener strong { font-size: 1.15rem; }
.signal-door__opener p { margin: 0; color: #5f584a; font-size: .82rem; }
.signal-door__opener a { color: #2b2415; font-size: .72rem; font-weight: 800; }

.signal-door__foot { position: absolute; left: clamp(20px,4vw,62px); right: clamp(20px,4vw,62px); bottom: max(14px,env(safe-area-inset-bottom)); display: flex; justify-content: space-between; gap: 30px; color: rgba(255,255,255,.66); font-size: .58rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.signal-door__foot p { max-width: 600px; margin: 0; text-align: right; }

@keyframes signal-breathe { from { transform: scale(1.035); } to { transform: scale(1); } }

@media (max-width: 720px) {
  .signal-door { min-height: 780px; }
  .signal-door__art { object-position: 34% 53%; }
  .signal-door__shade { background: linear-gradient(180deg,rgba(0,0,0,.78),rgba(0,0,0,.06) 28%,rgba(0,0,0,.24) 49%,rgba(0,0,0,.97) 78%); }
  .signal-door__mast { padding-inline: 18px; }
  .signal-door__mast p { display: none; }
  .signal-door { overflow-y: auto; }
  .signal-door__story { align-self: end; padding: 128px 18px 458px; }
  .signal-door__story h1 { font-size: clamp(3.8rem,19vw,5.7rem); }
  .signal-door__actions { display: grid; }
  .signal-door__actions a { width: 100%; }
  .signal-door__opener { display: none; }
  .signal-door__offer { left: 18px; right: 18px; bottom: 82px; width: auto; padding: 16px; }
  .signal-door__foot { left: 18px; right: 18px; bottom: max(12px,env(safe-area-inset-bottom)); }
  .signal-door__foot p { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .signal-door__art { animation: none; }
  .signal-door__actions a { transition: none; }
}