/* Homepage registration (#register): a class ticket beside the form, a progress
   bar that fills as the required fields are done, interest chips, and a
   "Seat saved" stamp on the ticket after registering (register-fx.js).
   Everything is scoped to #register: .register-panel is also used in /admin. */
#register .reg-layout {
  display: grid; grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.25fr); gap: 28px;
  max-width: 1080px; margin: 0 auto; align-items: start;
}
#register .reg-layout > .register-panel { max-width: none; margin: 0; width: 100%; }

/* ---------- Ticket ---------- */
#register .reg-ticket {
  position: sticky; top: 96px; border-radius: var(--radius-lg); overflow: hidden; isolation: isolate;
  background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 22%, var(--surface)), var(--surface) 62%);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: 0 30px 60px -36px color-mix(in srgb, var(--accent) 70%, transparent);
}
#register .reg-ticket::before { /* slow light sweep across the ticket */
  content: ""; position: absolute; inset: -40% -60%; z-index: -1;
  background: linear-gradient(105deg, transparent 42%, color-mix(in srgb, var(--accent-2) 14%, transparent) 50%, transparent 58%);
  animation: reg-sweep 7s ease-in-out infinite;
}
#register .reg-ticket-top { padding: 28px 28px 22px; }
#register .reg-ticket-kicker { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; font-weight: 600; color: var(--accent-2); margin: 0 0 10px; }
#register .reg-live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 0 var(--success); animation: reg-pulse 2s ease-out infinite; }
#register .reg-ticket-date { font-family: var(--font-head); font-size: clamp(1.35rem, 1rem + 1vw, 1.7rem); line-height: 1.2; margin: 0 0 14px; color: var(--text); }
#register .reg-times { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 0; }
#register .reg-times div { padding: 10px 12px; border-radius: var(--radius-sm); background: color-mix(in srgb, var(--bg) 55%, transparent); border: 1px solid var(--border); }
#register .reg-times dt { font-size: 0.74rem; color: var(--text-muted); margin: 0 0 2px; }
#register .reg-times dd { margin: 0; font: 700 1.05rem/1.2 var(--font-head); color: var(--text); }
#register .reg-times.has-yours { grid-template-columns: repeat(3, 1fr); }
#register .reg-times.has-yours div { padding-inline: 10px; }

#register .reg-cd[hidden] { display: none; } /* no source countdown: hide, never show 00 (2026-10-08) */
#register .reg-cd { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
#register .reg-cd div { text-align: center; padding: 10px 4px 8px; border-radius: var(--radius-sm); background: color-mix(in srgb, var(--accent) 12%, transparent); }
#register .reg-cd b { display: block; font: 700 1.45rem/1 var(--font-head); color: var(--text); font-variant-numeric: tabular-nums; }
#register .reg-cd b.tick { animation: reg-tick 0.45s ease; }
#register .reg-cd span { display: block; margin-top: 5px; font-size: 0.7rem; color: var(--text-muted); }

/* the tear line between the ticket and its stub */
#register .reg-perf { position: relative; height: 0; border-top: 2px dashed color-mix(in srgb, var(--text-muted) 35%, transparent); margin: 0 18px; }
#register .reg-perf::before, #register .reg-perf::after {
  content: ""; position: absolute; top: -13px; width: 24px; height: 24px; border-radius: 50%; background: var(--bg);
}
#register .reg-perf::before { left: -32px; }
#register .reg-perf::after { right: -32px; }

#register .reg-ticket-stub { padding: 22px 28px 26px; }
#register .reg-gets { list-style: none; margin: 0 0 18px; padding: 0; display: grid; gap: 12px; }
#register .reg-gets li { display: flex; gap: 12px; align-items: flex-start; font-size: 0.92rem; color: var(--text); }
#register .reg-gets svg { flex-shrink: 0; width: 20px; height: 20px; color: var(--accent-2); margin-top: 1px; }
#register .reg-count { margin: 0; font-size: 0.86rem; color: var(--text-muted); }
#register .reg-count strong { font: 700 1.1rem/1 var(--font-head); color: var(--text); font-variant-numeric: tabular-nums; }

/* "Seat saved" stamp, pressed onto the ticket after registering */
#register .reg-stamp {
  position: absolute; right: 18px; top: 18px; padding: 8px 14px; border: 3px solid var(--success); border-radius: 10px;
  font: 800 1rem/1 var(--font-head); color: var(--success); background: color-mix(in srgb, var(--success) 10%, transparent);
  transform: rotate(-12deg) scale(2.2); opacity: 0; pointer-events: none;
}
#register.is-registered .reg-stamp { animation: reg-stamp 0.55s cubic-bezier(.3,1.6,.5,1) forwards; }

/* ---------- Form ---------- */
#register .register-panel { position: relative; overflow: hidden; }
#register .reg-progress { position: absolute; left: 0; right: 0; top: 0; height: 4px; background: color-mix(in srgb, var(--accent) 14%, transparent); }
#register .reg-progress span {
  display: block; height: 100%; width: 0; border-radius: 0 4px 4px 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--success));
  transition: width 0.5s cubic-bezier(.2,.8,.2,1);
}
#register .reg-progress-text { margin: 0 0 18px; font-size: 0.82rem; color: var(--text-muted); }
#register .reg-progress-text b { color: var(--text); }
#register .field label { transition: color 0.25s ease; }
#register .field:focus-within > label { color: var(--accent-2); }
#register .field input, #register .field select, #register .field textarea { transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease; }
#register .field.is-done input, #register .field.is-done select { border-color: color-mix(in srgb, var(--success) 55%, var(--border)); }
#register .field { position: relative; }
#register .field.is-done::after { /* a small check when a required field is filled in */
  content: ""; position: absolute; right: 12px; top: 40px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--success) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 10px no-repeat;
  animation: reg-pop 0.35s cubic-bezier(.3,1.6,.5,1);
}
#register .field.is-done:has(select)::after { right: 40px; }

/* interest chips (the checkboxes stay real checkboxes, visually hidden but focusable) */
#register .lr-interests { display: flex; flex-wrap: wrap; gap: 8px; }
#register .lr-interests label {
  position: relative; display: inline-flex; align-items: center; gap: 7px; margin: 0; padding: 9px 14px 9px 12px; cursor: pointer;
  font-size: 0.88rem; font-weight: 600; border-radius: 999px; border: 1px solid var(--border); background: color-mix(in srgb, var(--bg) 40%, transparent);
  color: var(--text-muted); transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.2s ease;
}
#register .lr-interests label:hover { border-color: var(--accent); color: var(--text); }
#register .lr-interests input { position: absolute; opacity: 0; width: 1px; height: 1px; }
#register .lr-interests label::before {
  content: ""; width: 16px; height: 16px; border-radius: 50%; border: 2px solid color-mix(in srgb, var(--text-muted) 60%, transparent);
  transition: background 0.25s ease, border-color 0.25s ease;
}
#register .lr-interests label:has(input:checked) { color: #fff; background: var(--accent); border-color: var(--accent); animation: reg-pop 0.3s ease; }
#register .lr-interests label:has(input:checked)::before {
  border-color: #fff; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f7bff' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 10px no-repeat;
}
#register .lr-interests label:has(input:focus-visible) { outline: 2px solid var(--accent-2); outline-offset: 2px; }

/* submit: a light sheen passes over it every few seconds */
#register #registerForm button[type="submit"] { position: relative; overflow: hidden; font-size: 1.02rem; padding-block: 15px; }
#register #registerForm button[type="submit"]::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 40%; left: -60%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,0.28), transparent); animation: reg-sheen 4.5s ease-in-out infinite 1.5s;
}

/* ---------- Motion ---------- */
@keyframes reg-sweep { 0%, 100% { transform: translateX(-30%); } 50% { transform: translateX(30%); } }
@keyframes reg-pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 60%, transparent); } 100% { box-shadow: 0 0 0 10px transparent; } }
@keyframes reg-tick { 0% { transform: translateY(-35%); opacity: 0.2; } 100% { transform: none; opacity: 1; } }
@keyframes reg-pop { 0% { transform: scale(0.85); } 60% { transform: scale(1.06); } 100% { transform: none; } }
@keyframes reg-sheen { 0% { left: -60%; } 30%, 100% { left: 130%; } }
@keyframes reg-stamp { to { transform: rotate(-12deg) scale(1); opacity: 1; } }

/* ---------- Smaller screens ---------- */
@media (max-width: 979px) {
  #register .reg-layout { grid-template-columns: 1fr; gap: 18px; max-width: 720px; }
  #register .reg-ticket { position: relative; top: 0; }
  #register .reg-ticket-stub { display: none; } /* the form comes right after; keep the ticket short */
  #register .reg-perf { display: none; }
}
@media (max-width: 420px) {
  #register .reg-ticket-top { padding: 22px 18px 18px; }
  #register .reg-cd b { font-size: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) {
  #register .reg-ticket::before, #register .reg-live-dot, #register #registerForm button[type="submit"]::after { animation: none; }
  #register .reg-cd b.tick, #register .field.is-done::after, #register .lr-interests label:has(input:checked) { animation: none; }
  #register.is-registered .reg-stamp { animation: none; opacity: 1; transform: rotate(-12deg); }
  #register .reg-progress span { transition: none; }
}
html.lite #register .reg-ticket::before, html.lite #register #registerForm button[type="submit"]::after { animation: none; }
/* register.html (2026-10-08): the success screen's buttons keep icon size (the Telegram icon filled the button), and the
   "0 of 4 required fields" line goes once the student is registered. */
#register .register-success .btn svg { width: 20px; height: 20px; flex: none; }
#register.is-registered .reg-progress-text, #register.is-registered .reg-progress { display: none; }