:root {
  --bg: #f4f0fb;
  --card: #ffffff;
  --primary: #673ab7;
  --primary-dark: #512da8;
  --text: #202124;
  --muted: #5f6368;
  --line: #dadce0;
  --error: #b3261e;
  --success: #137333;
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #efe7fb 0%, #f8f6fc 100%);
}

.page-shell {
  width: min(920px, 94%);
  margin: 32px auto;
}

.form-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(60, 64, 67, 0.12);
  overflow: hidden;
}

.brand-bar {
  height: 12px;
  background: var(--primary);
}

.form-header,
.question-group,
.actions,
.success-message {
  padding: 26px;
}

.form-header {
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary-dark);
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  line-height: 1.15;
}

.intro, .required-note, .helper-text {
  color: var(--muted);
  line-height: 1.5;
}

.required-note span,
label span,
legend span {
  color: var(--error);
}

.question-group {
  border-bottom: 1px solid var(--line);
}

.details-section {
  padding-bottom: 14px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 24px;
  row-gap: 8px;
}

.field {
  grid-column: span 4;
  min-width: 0;
}

.wide-field {
  grid-column: span 8;
}

label,
legend {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}

input[type="text"],
input[type="tel"],
input[type="email"],
select {
  width: 100%;
  border: none;
  border-bottom: 2px solid var(--line);
  padding: 14px 2px 10px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  outline: none;
  transition: border-color 0.2s ease;
}

input:focus,
select:focus {
  border-color: var(--primary);
}

.availability-table {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin-top: 18px;
}

.availability-row {
  display: grid;
  grid-template-columns: 1.25fr repeat(3, 1fr);
  align-items: stretch;
  border-bottom: 1px solid var(--line);
}

.availability-row:last-child { border-bottom: none; }

.availability-row > div,
.availability-row > label {
  padding: 14px;
  border-right: 1px solid var(--line);
  margin: 0;
  font-weight: 500;
}

.availability-row > div:last-child,
.availability-row > label:last-child { border-right: none; }

.availability-head {
  background: #f7f2ff;
  font-weight: 700;
}

.day-label {
  background: #fbfaff;
  font-weight: 700 !important;
}

.availability-row label,
.checkbox-grid label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.checkbox-grid label {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 14px;
  font-weight: 500;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.checkbox-grid label:hover {
  border-color: var(--primary);
  background: #fbf8ff;
}

.actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  padding: 13px 26px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

button.secondary {
  background: transparent;
  color: var(--primary-dark);
}

.success-message {
  margin: 0 26px 26px;
  border-radius: 14px;
  background: #e6f4ea;
  color: var(--success);
  font-weight: 700;
}

.form-error {
  margin: 0 26px 26px;
  padding: 26px;
  border-radius: 14px;
  background: #fce8e6;
  color: var(--error);
  font-weight: 700;
}

.error-message {
  display: block;
  margin-top: 10px;
  color: var(--error);
  min-height: 18px;
}

.invalid input[type="text"],
.invalid input[type="tel"],
.invalid input[type="email"],
.invalid select {
  border-color: var(--error);
}

/* ==========================================
   SUCCESS PAGE
========================================== */

.page-shell.narrow {
  width: min(760px, 92%);
}

.center-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.success-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 24px;
  box-shadow: 0 18px 50px rgba(60, 64, 67, 0.12);
  padding: 42px;
  text-align: center;
}

.success-icon {
  width: 76px;
  height: 76px;
  margin: 0 auto 18px;
  background: var(--success);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 2.5rem;
  font-weight: 900;
}

.success-card h1 {
  color: var(--primary);
  margin: 0 0 10px;
}

.success-card p {
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.success-card .hint {
  color: var(--muted);
  font-size: 0.95rem;
}

.submit-btn {
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  padding: 13px 26px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s ease, transform 0.2s ease;
}

.submit-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.inline-btn {
  display: inline-block;
  width: auto;
  margin-top: 16px;
  text-decoration: none;
}

@media (max-width: 720px) {
  .page-shell {
    width: 100%;
    margin: 0;
  }

  .form-card {
    min-height: 100vh;
    border-radius: 0;
  }

  .form-header,
  .question-group,
  .actions,
  .success-message {
    padding: 20px;
  }


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

  .field,
  .wide-field {
    grid-column: auto;
  }

  .availability-row {
    grid-template-columns: 1fr;
  }

  .availability-head {
    display: none;
  }

  .availability-row > div,
  .availability-row > label {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .availability-row > label:last-child {
    border-bottom: none;
  }

  .availability-row label span {
    color: var(--text);
  }

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

  .actions button {
    width: 100%;
  }
}