:root {
  --bg: #eef2f6;
  --ink: #17202a;
  --muted: #667085;
  --panel: #ffffff;
  --line: #dbe3ec;
  --accent: #d3233a;
  --accent-dark: #9f182c;
  --teal: #0b756b;
  --green: #14885a;
  --booked: #cbd3dd;
  --field: #f7f9fc;
  --shadow: 0 24px 70px rgba(22, 32, 45, 0.13);
  --soft-shadow: 0 10px 24px rgba(22, 32, 45, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  overflow-x: hidden;
  min-height: 100vh;
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(11, 117, 107, 0.13), transparent 34%),
    linear-gradient(180deg, #f7f9fc 0%, var(--bg) 100%);
}

button,
input,
select {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  width: min(1320px, calc(100% - 36px));
  min-height: calc(100vh - 36px);
  margin: 18px auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 20px;
}

.booking-panel,
.summary-panel {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.booking-panel {
  padding: 18px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  min-height: 120px;
  padding: 22px 26px;
  color: #fff;
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(20, 24, 31, 0.98), rgba(31, 43, 55, 0.96)),
    linear-gradient(110deg, var(--accent), var(--teal));
  box-shadow: 0 18px 36px rgba(21, 23, 28, 0.2);
}

.topbar h1,
.summary-top h2 {
  margin: 0;
}

.topbar h1 {
  font-size: clamp(1.8rem, 3vw, 2.55rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.08;
}

.event-line {
  display: block;
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(0.82rem, 1.35vw, 0.92rem);
  line-height: 1.35;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.event-meta {
  display: grid;
  grid-template-columns: 1.25fr 1.2fr 1fr 0.7fr;
  gap: 10px;
  margin-top: 14px;
}

.event-meta div {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #fbfcfe);
  box-shadow: none;
}

.event-meta span,
.ticket-card span,
.details-form span {
  color: var(--muted);
  font-weight: 650;
}

.event-meta span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.77rem;
}

.event-meta strong {
  font-size: 1rem;
}

.event-meta select:not(.sr-only) {
  width: 100%;
  min-height: 34px;
  border: 1px solid #ccd6e2;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-weight: 800;
}

.seat-area {
  margin-top: 14px;
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background:
    linear-gradient(180deg, #ffffff, #f8fafc);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.course-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.course-card {
  position: relative;
  min-height: 64px;
  padding: 12px 38px 12px 14px;
  border: 1px solid #d3dce7;
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  box-shadow: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease,
    background 160ms ease;
}

.course-card::after {
  content: "›";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: #eef3f7;
  color: #536171;
  font-size: 1.2rem;
  font-weight: 800;
  transform: translateY(-50%);
}

.course-card:hover,
.course-card:focus-visible {
  border-color: rgba(211, 35, 58, 0.55);
  box-shadow: 0 12px 24px rgba(22, 32, 45, 0.12);
  transform: translateY(-1px);
  outline: 0;
}

.course-card span,
.course-card strong {
  display: block;
}

.course-card span {
  font-size: 0.88rem;
  font-weight: 850;
  line-height: 1.25;
}

.course-card strong {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.78rem;
}

.course-card.active {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 14px 28px rgba(211, 35, 58, 0.22);
}

.course-card.active strong {
  color: rgba(255, 255, 255, 0.78);
}

.course-card.active::after {
  content: "✓";
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 0.9rem;
}

.course-empty {
  padding: 16px;
  border: 1px dashed rgba(102, 112, 133, 0.38);
  border-radius: 12px;
  background: #f8fafc;
  color: var(--muted);
  font-weight: 750;
}

.stage {
  position: relative;
  width: min(600px, 94%);
  height: 54px;
  margin: 0 auto 20px;
  display: grid;
  place-items: end center;
  color: #607080;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  border: 0;
  box-shadow: none;
}

.stage::before {
  content: "";
  position: absolute;
  left: 4%;
  right: 4%;
  top: 6px;
  height: 24px;
  border-top: 6px solid #61d8c9;
  border-radius: 50% 50% 0 0;
  filter: drop-shadow(0 12px 12px rgba(11, 117, 107, 0.16));
}

.stage::after {
  content: "";
  position: absolute;
  left: 14%;
  right: 14%;
  top: 17px;
  height: 16px;
  border-top: 1px solid rgba(103, 215, 199, 0.55);
  border-radius: 50% 50% 0 0;
}

.seat-map {
  width: min(640px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, minmax(40px, 1fr)) 28px repeat(5, minmax(40px, 1fr));
  gap: 12px;
}

.seat {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid #cfd8e3;
  border-bottom: 3px solid #b8c3cf;
  border-radius: 9px 9px 6px 6px;
  background: linear-gradient(180deg, #ffffff, #f7f9fb);
  color: #18304a;
  font-size: clamp(0.64rem, 1.15vw, 0.82rem);
  font-weight: 850;
  cursor: pointer;
  box-shadow: 0 5px 10px rgba(24, 48, 74, 0.08);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease,
    background 160ms ease;
}

.seat:hover:not(:disabled) {
  border-color: rgba(211, 35, 58, 0.72);
  box-shadow: 0 14px 24px rgba(211, 35, 58, 0.16);
  transform: translateY(-2px);
}

.seat:nth-child(10n + 6) {
  grid-column: 7;
}

.seat.selected {
  border-color: var(--accent-dark);
  border-bottom-color: #7c0f20;
  background: linear-gradient(180deg, #ee3c51, var(--accent));
  color: #fff;
  box-shadow: 0 16px 28px rgba(211, 35, 58, 0.28);
}

.seat.booked {
  border-color: #b8c2ce;
  border-bottom-color: #a7b2bf;
  background: linear-gradient(180deg, #dbe2ea, var(--booked));
  color: #6d7a89;
  cursor: not-allowed;
  box-shadow: none;
}

.legend {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 750;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend .seat {
  width: 18px;
  cursor: default;
  transform: none;
}

.summary-panel {
  position: sticky;
  top: 18px;
  align-self: start;
  padding: 22px;
  border-color: var(--line);
  background: linear-gradient(180deg, #ffffff, #fbfcfe);
}

.summary-top {
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(21, 23, 28, 0.08);
}

.summary-top h2 {
  font-size: 1.42rem;
  line-height: 1.2;
}

#activeSeat {
  color: var(--accent);
}

.summary-top p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.summary-panel.no-seat {
  padding-bottom: 24px;
}

.summary-panel.no-seat .summary-top {
  padding-bottom: 0;
  border-bottom: 0;
}

.summary-panel.no-seat #formHint {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid #dbe3ec;
  border-radius: 12px;
  background: linear-gradient(180deg, #f8fafc, #ffffff);
  color: #536171;
  font-weight: 650;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

.summary-panel.no-seat .details-form,
.summary-panel.no-seat .ticket-card,
.summary-panel.no-seat .success-notice,
.summary-panel.no-seat .submit-button {
  display: none;
}

.details-form {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.details-form label {
  display: grid;
  gap: 7px;
}

.details-form span {
  font-size: 0.8rem;
  letter-spacing: 0;
}

.details-form input,
.details-form select {
  width: 100%;
  min-height: 46px;
  padding: 11px 13px;
  border: 1px solid #ccd6e2;
  border-radius: 10px;
  background: var(--field);
  color: var(--ink);
  outline: 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.details-form input:focus,
.details-form select:focus {
  border-color: var(--accent);
  box-shadow:
    0 0 0 3px rgba(201, 33, 52, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.details-form input:disabled,
.details-form select:disabled {
  color: #7f8b99;
  background: #eef3f7;
  cursor: not-allowed;
}

.ticket-card {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fbfcfe;
  box-shadow: var(--soft-shadow);
}

.ticket-card div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
}

.ticket-card div + div {
  border-top: 1px solid rgba(21, 23, 28, 0.07);
}

.ticket-card strong {
  text-align: right;
}

.success-notice {
  margin-top: 16px;
  padding: 14px;
  border: 1px solid rgba(21, 145, 93, 0.28);
  border-radius: 12px;
  background: #eefaf4;
  color: #125c3f;
}

.success-notice strong,
.success-notice span {
  display: block;
}

.success-notice strong {
  font-size: 0.96rem;
}

.success-notice span {
  margin-top: 6px;
  color: #2f6f55;
  font-size: 0.88rem;
  line-height: 1.45;
}

.submit-button {
  width: 100%;
  margin-top: 16px;
  min-height: 50px;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  cursor: pointer;
  font-weight: 850;
  font-size: 1rem;
  box-shadow: 0 16px 28px rgba(201, 33, 52, 0.23);
}

.submit-button:disabled {
  background: #c7d0dc;
  color: #ffffff;
  cursor: not-allowed;
  box-shadow: none;
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .summary-panel {
    position: static;
  }
}

@media (max-width: 640px) {
  .event-meta {
    grid-template-columns: 1fr 1fr;
  }

  .course-picker {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 560px) {
  .app-shell {
    width: 100%;
    min-height: 100vh;
    margin: 0;
  }

  .booking-panel,
  .summary-panel {
    border-radius: 0;
  }

  .booking-panel {
    padding: 14px;
  }

  .topbar {
    align-items: start;
  }

  .seat-map {
    grid-template-columns: repeat(5, minmax(28px, 1fr)) 12px repeat(5, minmax(28px, 1fr));
    gap: 8px;
  }

  .seat:nth-child(10n + 6) {
    grid-column: 7;
  }
}

@media (max-width: 420px) {
  .event-meta,
  .course-picker {
    grid-template-columns: 1fr;
  }
}