:root {
  font: 15px/1.55 system-ui, sans-serif;
  color: #eef2ff;
  background: #101321;
  color-scheme: dark;
  --muted: #abb6cf;
  --line: #353d58;
  --accent: #b9a7ff;
}
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at top right, #252242, transparent 60%); min-height: 100vh; }
main { max-width: 1200px; margin: auto; padding: clamp(24px, 5vw, 64px) clamp(16px, 4vw, 44px); }
header { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
small { color: var(--accent); font-weight: 750; letter-spacing: .13em; }
h1 { font-size: clamp(32px, 5vw, 52px); letter-spacing: -.05em; line-height: 1.1; margin: 8px 0; }
h2 { font-size: clamp(19px, 2vw, 25px); letter-spacing: -.025em; margin: 8px 0; }
h3 { margin: 0 0 8px; }
p { margin: 0 0 8px; overflow-wrap: anywhere; }
header p, aside, .intro, #time, article p { color: var(--muted); }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.workspace { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 20px; align-items: start; }
.tunnel, form { background: #1b2033; border: 1px solid var(--line); border-radius: 18px; padding: clamp(16px, 3vw, 28px); }
#login { max-width: 440px; margin: 28px auto; }
article { margin-top: 22px; padding: 16px; background: #15192a; border-radius: 10px; border-left: 3px solid var(--accent); }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.wide { grid-column: 1 / -1; }
label { display: block; font-size: .93rem; font-weight: 600; }
#login label, .check { margin: 16px 0; }
.check { display: flex; align-items: center; gap: 8px; }
input:not([type=checkbox]), select { display: block; width: 100%; min-height: 44px; padding: 9px 10px; margin-top: 6px; border: 1px solid var(--line); border-radius: 8px; color: inherit; background: #121627; font: inherit; }
input::placeholder { color: #929db8; }
input[type=checkbox] { accent-color: var(--accent); width: 17px; height: 17px; flex: none; }
button { min-height: 44px; padding: 10px 16px; background: var(--accent); color: #151126; border: 1px solid transparent; border-radius: 8px; cursor: pointer; font: inherit; font-weight: 750; }
nav button { background: #232942; color: #eef2ff; border-color: var(--line); }
button:hover { filter: brightness(1.12); }
:focus-visible { outline: 2px solid #d4caff; outline-offset: 3px; }
#message:not(:empty), #preview-result:not(:empty) { color: #ffe2aa; margin: 14px 0 0; }
aside { margin-top: 20px; font-size: .9rem; max-width: 76ch; }
[hidden] { display: none !important; }
@media (max-width: 760px) { .workspace { grid-template-columns: 1fr; } }
@media (max-width: 420px) { .fields { grid-template-columns: 1fr; } }
.rules { margin-top: 20px; } .rules article button { margin: 5px 8px 0 0; } button:disabled { opacity: .55; cursor: wait; }