:root {
  --primary: #ff4747;
  --primary-dark: #ff4747;
  --primary-soft: #eff6ff;

  --text: ##ff4747;
  --text-muted: #6b7280;

  --border: #dbe2ea;
  --background: #f4f7fb;
  --surface: #ffffff;

  --danger: #dc2626;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;

  --shadow:
	0 18px 45px rgba(15, 23, 42, 0.08),
	0 2px 8px rgba(15, 23, 42, 0.04);

  --transition: 180ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 40px 20px;

  color: var(--text);

  background:
	radial-gradient(
	  circle at top left,
	  rgba(37, 99, 235, 0.08),
	  transparent 35%
	),
	var(--background);

  font-family:
	Inter,
	-apple-system,
	BlinkMacSystemFont,
	"Segoe UI",
	Roboto,
	Helvetica,
	Arial,
	sans-serif;
}

.registration-form {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 40px;

  background: rgba(255, 255, 255, 0.97);

  border: 1px solid rgba(219, 226, 234, 0.9);
  border-radius: var(--radius-lg);

  box-shadow: var(--shadow);
}

.form-header {
  margin-bottom: 32px;
}

.form-header h1 {
  margin: 0 0 10px;

  font-size: clamp(30px, 5vw, 40px);
  font-weight: 750;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.form-header h2 {
  color: #ff4747;
  font-size: 20px;
}

.form-header p {
  margin: 0;

  color: var(--text-muted);

  font-size: 15px;
  line-height: 1.6;
}

.form-section {
  margin-top: 30px;
  padding-top: 30px;

  border-top: 1px solid #e8edf3;
}

.form-section:first-of-type {
  margin-top: 0;
  padding-top: 0;

  border-top: 0;
}

.section-title {
  margin: 0 0 18px;

  font-size: 18px;
  font-weight: 750;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

.form-group {
  margin-bottom: 22px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;

  margin-bottom: 9px;

  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.required {
  color: var(--danger);
}

.form-control {
  display: block;

  width: 100%;
  min-height: 52px;

  padding: 0 16px;

  color: var(--text);
  background: #ffffff;

  border: 1px solid var(--border);
  border-radius: var(--radius);

  outline: none;

  font: inherit;
  font-size: 16px;

  box-shadow:
	0 1px 2px rgba(15, 23, 42, 0.02);

  transition:
	border-color var(--transition),
	box-shadow var(--transition);
}

.form-control:hover {
  border-color: #b7c3d0;
}

.form-control:focus {
  border-color: var(--primary);

  box-shadow:
	0 0 0 4px rgba(37, 99, 235, 0.12);
}

.form-control::placeholder {
  color: #a7b1c2;
  opacity: 1;
}

.form-help {
  margin: 8px 0 0;

  color: var(--text-muted);

  font-size: 13px;
  line-height: 1.55;
}

a {
  color: var(--primary);

  text-decoration-thickness: 1px;
  text-underline-offset: 3px;

  transition: color var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

.checkbox-list {
  display: grid;
  gap: 9px;
}

.checkbox-card {
  position: relative;

  display: flex;
  align-items: flex-start;
  gap: 12px;

  width: 100%;

  padding: 13px 14px;

  background: #f8fafc;

  border: 1px solid #edf1f5;
  border-radius: var(--radius);

  cursor: pointer;

  transition:
	background-color var(--transition),
	border-color var(--transition),
	box-shadow var(--transition);
}

.checkbox-card:hover {
  background: #ffffff;
  border-color: #cfd8e3;
}

.checkbox-card:has(input:checked) {
  background: var(--primary-soft);
  border-color: rgba(37, 99, 235, 0.35);
}

.checkbox-card input[type="checkbox"] {
  position: absolute;

  width: 1px;
  height: 1px;

  opacity: 0;
  pointer-events: none;
}

.custom-checkbox {
  position: relative;

  flex: 0 0 20px;

  width: 20px;
  height: 20px;
  margin-top: 1px;

  background: #ffffff;

  border: 1.5px solid #aab5c3;
  border-radius: 6px;

  transition:
	background-color var(--transition),
	border-color var(--transition),
	box-shadow var(--transition);
}

.checkbox-card input:checked + .custom-checkbox {
  background: var(--primary);
  border-color: var(--primary);

  box-shadow:
	0 0 0 3px rgba(37, 99, 235, 0.12);
}

.checkbox-card input:checked + .custom-checkbox::after {
  content: "";

  position: absolute;
  top: 2px;
  left: 6px;

  width: 5px;
  height: 10px;

  border: solid #ffffff;
  border-width: 0 2px 2px 0;

  transform: rotate(45deg);
}

.checkbox-card input:focus-visible + .custom-checkbox {
  outline: 3px solid rgba(37, 99, 235, 0.22);
  outline-offset: 2px;
}

.checkbox-text {
  flex: 1;

  font-size: 14px;
  line-height: 1.55;
}

.festival-options .checkbox-text {
  font-size: 15px;
}

.privacy-list {
  display: grid;
  gap: 12px;
}

.privacy-list .checkbox-card {
  background: #fafbfc;
}

.privacy-list .checkbox-card:hover {
  background: #f7f9fc;
}

.privacy-list .checkbox-card:has(input:checked) {
  background: var(--primary-soft);
}

.form-error {
  display: none;

  margin-top: 10px;
  padding: 10px 12px;

  color: #b91c1c;
  background: #fef2f2;

  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);

  font-size: 13px;
  line-height: 1.4;
}

.form-error.visible {
  display: block;
}

.form-actions {
  margin-top: 32px;
}

.submit-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;

  min-width: 160px;
  min-height: 52px;

  padding: 0 26px;

  color: #ffffff;

  background:
	linear-gradient(
	  135deg,
	  var(--primary),
	  var(--primary-dark)
	);

  border: 0;
  border-radius: var(--radius);

  font: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;

  cursor: pointer;

  box-shadow:
	0 8px 20px rgba(37, 99, 235, 0.22);

  transition:
	transform var(--transition),
	box-shadow var(--transition),
	opacity var(--transition);
}

.submit-button:hover:not(:disabled) {
  transform: translateY(-2px);

  box-shadow:
	0 12px 28px rgba(37, 99, 235, 0.28);
}

.submit-button:active:not(:disabled) {
  transform: translateY(0);
}

.submit-button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.25);
  outline-offset: 3px;
}

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

.button-spinner {
  display: none;

  width: 16px;
  height: 16px;

  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #ffffff;
  border-radius: 50%;

  animation: spin 0.7s linear infinite;
}

.submit-button.loading .button-spinner {
  display: inline-block;
}

@keyframes spin {
  to {
	transform: rotate(360deg);
  }
}

@media (max-width: 700px) {
  body {
	padding: 16px 10px;
  }

  .registration-form {
	padding: 28px 20px;

	border-radius: 16px;
  }

  .form-header {
	margin-bottom: 26px;
  }

  .form-header h1 {
	font-size: 30px;
  }
  
  .form-section {
	margin-top: 25px;
	padding-top: 25px;
  }

  .submit-button {
	width: 100%;
  }
}

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(1px);
}

.loading-overlay[hidden] {
  display: none;
}

.loading-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 22px 28px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.15);
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 4px solid #e5e7eb;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: loading-spin 0.8s linear infinite;
}

.loading-message {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

@keyframes loading-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
	transition-duration: 0.01ms !important;
	animation-duration: 0.01ms !important;
	scroll-behavior: auto !important;
  }
}

.is-hidden {
  display: none !important;
}