* {
  box-sizing: border-box;
}

html {
  font-family: Arial, sans-serif;
  background: #f6f8fc;
  color: #172033;
}

body {
  margin: 0;
}

.site-container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid #e6eaf2;
}

.site-header .site-container {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  color: #172033;
  font-size: 24px;
  font-weight: 800;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  color: #172033;
  text-decoration: none;
}

.button-link,
.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 20px;
  border-radius: 10px;
  background: #172033;
  color: #ffffff !important;
  font-weight: 700;
  text-decoration: none;
}

.placeholder {
  min-height: calc(100vh - 146px);
  display: grid;
  align-items: center;
  padding: 80px 0;
}

.placeholder h1 {
  max-width: 760px;
  margin: 10px 0 18px;
  font-size: clamp(42px, 8vw, 84px);
  line-height: 0.98;
}

.placeholder p {
  max-width: 650px;
  font-size: 18px;
  line-height: 1.7;
}

.eyebrow {
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.primary-button {
  margin-top: 18px;
}

.site-footer {
  padding: 24px 0;
  background: #ffffff;
  border-top: 1px solid #e6eaf2;
}

.registration-page {
  padding: 70px 0 100px;
}

.registration-heading {
  max-width: 760px;
  margin-bottom: 38px;
}

.registration-heading h1 {
  margin: 10px 0 16px;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1;
}

.registration-heading > p:last-child {
  color: #5f6879;
  font-size: 18px;
  line-height: 1.7;
}

.back-link {
  display: inline-flex;
  margin-bottom: 32px;
  color: #172033;
  font-weight: 700;
  text-decoration: none;
}

.registration-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.75fr);
  align-items: start;
  gap: 30px;
}

.registration-form-card,
.programme-summary {
  border: 1px solid #e3e8f1;
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 20px 60px rgba(23, 32, 51, 0.08);
}

.registration-form-card {
  padding: 34px;
}

.form-section + .form-section {
  margin-top: 42px;
  padding-top: 38px;
  border-top: 1px solid #e7ebf2;
}

.form-section-heading {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
}

.form-section-heading > span {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border-radius: 50%;
  background: #172033;
  color: #ffffff;
  font-weight: 800;
}

.form-section-heading h2 {
  margin: 0 0 5px;
  font-size: 22px;
}

.form-section-heading p {
  margin: 0;
  color: #697286;
  line-height: 1.5;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.form-field {
  display: grid;
  gap: 9px;
}

.form-field-full {
  grid-column: 1 / -1;
}

.form-field > span {
  font-size: 14px;
  font-weight: 750;
}

.form-field strong,
.checkbox-field strong {
  color: #d84444;
}

.form-field input,
.form-field select {
  width: 100%;
  min-height: 52px;
  border: 1px solid #ccd3df;
  border-radius: 12px;
  background: #ffffff;
  color: #172033;
  font: inherit;
  padding: 0 15px;
  outline: none;
}

.form-field input:focus,
.form-field select:focus {
  border-color: #172033;
  box-shadow: 0 0 0 3px rgba(23, 32, 51, 0.1);
}

.affiliate-notice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 30px;
  padding: 16px 18px;
  border-radius: 14px;
  background: #eef3ff;
}

.affiliate-notice span {
  color: #566177;
}

.affiliate-notice strong {
  word-break: break-word;
}

.form-consents {
  display: grid;
  gap: 15px;
  margin-top: 30px;
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: #4f596c;
  line-height: 1.55;
  cursor: pointer;
}

.checkbox-field input {
  width: 19px;
  height: 19px;
  flex: 0 0 19px;
  margin-top: 2px;
}

.registration-submit {
  width: 100%;
  min-height: 58px;
  margin-top: 28px;
  border: 0;
  border-radius: 14px;
  background: #172033;
  color: #ffffff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.registration-submit:disabled {
  cursor: wait;
  opacity: 0.7;
}

.secure-note {
  margin: 13px 0 0;
  color: #6a7385;
  font-size: 13px;
  text-align: center;
}

.form-alert {
  margin-bottom: 24px;
  padding: 16px 18px;
  border-radius: 13px;
  line-height: 1.5;
}

.form-alert-error {
  border: 1px solid #f2b7b7;
  background: #fff1f1;
  color: #982a2a;
}

.form-alert-success {
  border: 1px solid #addfc3;
  background: #effbf4;
  color: #17643a;
}

.programme-summary {
  position: sticky;
  top: 24px;
  padding: 30px;
}

.summary-label {
  margin: 0 0 12px;
  color: #697286;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.programme-summary h2 {
  margin: 0 0 12px;
  font-size: 28px;
}

.programme-summary > p {
  color: #626c7e;
  line-height: 1.65;
}

.programme-points {
  margin-top: 26px;
  border-top: 1px solid #e5e9f0;
}

.programme-points > div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 17px 0;
  border-bottom: 1px solid #e5e9f0;
}

.programme-points span {
  color: #697286;
}

.seat-notice {
  margin-top: 24px;
  padding: 17px;
  border-radius: 14px;
  background: #f0f3f8;
  color: #4d586b;
  line-height: 1.55;
}

@media (max-width: 900px) {
  .registration-layout {
    grid-template-columns: 1fr;
  }

  .programme-summary {
    position: static;
    order: -1;
  }
}

@media (max-width: 640px) {
  .registration-page {
    padding: 42px 0 70px;
  }

  .registration-form-card,
  .programme-summary {
    padding: 22px;
    border-radius: 18px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .form-field-full {
    grid-column: auto;
  }

  .affiliate-notice {
    align-items: flex-start;
    flex-direction: column;
  }
}