/* ============================================================
   KAIEI LP 問い合わせフォーム — Fresh Blue
   由香さんLP DESIGN.md 継承 / kaiei-recruit-form 統一デザイン
   参考: Stripe（構造美）/ Notion（呼吸感）/ Intercom（コピー温度感）
   ============================================================ */

:root {
  --color-primary: #1B61C9;
  --color-primary-dark: #0F3E8A;
  --color-primary-light: #EAF4FF;
  --color-accent: #2EC7E6;
  --color-navy: #102033;
  --color-text: #1F2A37;
  --color-muted: #5F6B7A;
  --color-border: #DCE8F5;
  --color-surface: #FFFFFF;
  --color-surface-soft: #F7FBFF;
  --color-error: #D7263D;
  --color-error-bg: #FDECEF;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 72px;

  --shadow-card: 0 14px 40px rgba(27, 97, 201, 0.10);
  --shadow-card-hover: 0 20px 50px rgba(27, 97, 201, 0.18);
  --shadow-focus: 0 0 0 3px rgba(46, 199, 230, 0.25);

  --font-base: "Inter", "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-surface-soft);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }

/* --- Site Header（ロゴバー） --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px var(--space-md);
  display: flex;
  align-items: center;
}
.site-header__logo {
  height: 36px;
  width: auto;
}

/* --- Hero --- */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-xl) var(--space-md) calc(var(--space-xl) + 20px);
  background:
    radial-gradient(circle at 20% 0%, rgba(46, 199, 230, 0.08), transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(27, 97, 201, 0.10), transparent 55%),
    linear-gradient(180deg, #FFFFFF 0%, var(--color-primary-light) 100%);
}
/* ドット格子パターン */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(27, 97, 201, 0.10) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: 0 0;
  opacity: 0.5;
  pointer-events: none;
}
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero__watermark {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 480px;
  max-width: 50%;
  opacity: 0.06;
}
.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.hero__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--color-primary);
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  margin: 0 0 var(--space-md);
}
.hero__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--color-navy);
  margin: 0 0 var(--space-md);
}
.hero__lead {
  font-size: 1rem;
  color: var(--color-text);
  margin: 0 auto var(--space-md);
  max-width: 560px;
  line-height: 1.9;
  word-break: keep-all;
  overflow-wrap: break-word;
}
.hero__lead p { margin: 0 0 var(--space-sm); }
.hero__note {
  font-size: 0.92rem;
  color: var(--color-muted);
  word-break: keep-all;
}
.hero__meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-md);
}
.hero__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-primary-dark);
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}

/* --- Form layout --- */
main {
  padding: 0 var(--space-md);
}
.form {
  max-width: 760px;
  margin: calc(var(--space-xl) * -1 + 40px) auto var(--space-xl);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  box-shadow: var(--shadow-card);
  position: relative;
}
.form__section {
  margin: 0 calc(var(--space-lg) * -1);
  padding: var(--space-lg) var(--space-lg) var(--space-xl);
  border-bottom: 1px dashed var(--color-border);
}
.form__section:last-of-type {
  border-bottom: 0;
  padding-bottom: var(--space-lg);
}
.form__section--alt {
  background: var(--color-surface-soft);
}
.form__section-head {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary-light);
}
.form__section-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--color-primary);
  color: #FFFFFF;
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(27, 97, 201, 0.25);
}
.form__section-title {
  font-size: clamp(1.4rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--color-navy);
  margin: 0;
  letter-spacing: -0.01em;
}

/* --- Field --- */
.field {
  margin-bottom: var(--space-lg);
  border: 0;
  padding: 0;
}
.field:last-child { margin-bottom: 0; }
.field--row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.field--3col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-md);
}
.field__half, .field__third {
  display: flex;
  flex-direction: column;
}
.field__sublabel {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted);
  margin: 0 0 8px;
}
.field__label,
legend.field__label {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--color-navy);
  margin: 0 0 12px;
  padding: 0;
  letter-spacing: 0.01em;
}
.field__help {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 8px 0 0;
}
.req {
  display: inline-block;
  margin-left: var(--space-xs);
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #FFFFFF;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  vertical-align: 2px;
}
.opt {
  display: inline-block;
  margin-left: var(--space-xs);
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  background: var(--color-border);
  border-radius: var(--radius-full);
  vertical-align: 2px;
}

/* --- Inputs --- */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="time"],
select,
textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color 200ms ease, box-shadow 200ms ease, background 200ms ease;
  -webkit-appearance: none;
  appearance: none;
}
input[type="date"] { min-height: 52px; }
input[type="time"] { min-height: 52px; }
.field__date-time {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.7;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235F6B7A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
  cursor: pointer;
}
input:hover:not(:focus),
select:hover:not(:focus),
textarea:hover:not(:focus) {
  border-color: var(--color-primary-light);
  background: var(--color-surface-soft);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
  background: var(--color-surface);
}
input::placeholder, textarea::placeholder { color: #A5B0BD; }

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

/* 必須未入力時：ラベルとフィールド全体を赤系で示す */
.field[aria-invalid="true"] > .field__label,
fieldset.field[aria-invalid="true"] > .field__label,
.field__half[aria-invalid="true"] > .field__label {
  color: var(--color-error);
}
.field[aria-invalid="true"] > .field__label::after,
fieldset.field[aria-invalid="true"] > .field__label::after,
.field__half[aria-invalid="true"] > .field__label::after {
  content: " ← ご入力ください";
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-error);
  margin-left: 6px;
}
fieldset.field[aria-invalid="true"] .choice {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}
fieldset.field[aria-invalid="true"] .choice:has(input[type="radio"]:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* --- Choice (radio list) — 単一選択はリスト式（縦積み） --- */
.choices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.choices--stack {
  grid-template-columns: 1fr;
}
.choice {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 180ms ease;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--color-text);
  position: relative;
}
.choice input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.choice span {
  flex: 1;
}
.choice::before {
  content: "";
  width: 20px;
  height: 20px;
  margin-right: 12px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  flex-shrink: 0;
  transition: all 150ms ease;
}
.choice:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-soft);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(27, 97, 201, 0.12);
}
.choice:has(input[type="radio"]:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: 600;
}
.choice:has(input[type="radio"]:checked)::before {
  border-color: var(--color-primary);
  background: var(--color-primary);
  box-shadow: inset 0 0 0 4px #FFFFFF;
}
.choice:has(input[type="radio"]:focus-visible) {
  box-shadow: var(--shadow-focus);
}
.form__section--alt .choice,
.form__section--alt input[type="text"],
.form__section--alt input[type="date"],
.form__section--alt textarea {
  background: var(--color-surface);
}
.form__section--alt .choice:has(input[type="radio"]:checked) {
  background: var(--color-primary-light);
}

/* --- Submit --- */
.form__submit {
  margin-top: var(--space-xl);
  text-align: center;
  padding: 0 var(--space-md);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 0;
  border-radius: var(--radius-full);
  padding: 18px 44px;
  cursor: pointer;
  transition: all 200ms ease;
  min-width: 280px;
  position: relative;
}
.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFFFFF;
  box-shadow: 0 10px 30px rgba(27, 97, 201, 0.30);
}
.btn--primary:hover:not(:disabled) {
  box-shadow: 0 14px 36px rgba(27, 97, 201, 0.40);
  transform: translateY(-2px);
}
.btn--primary:hover:not(:disabled) .btn__arrow {
  transform: translateX(4px);
}
.btn--primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(46, 199, 230, 0.4);
}
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}
.btn__arrow {
  display: inline-flex;
  transition: transform 200ms ease;
}
.btn__spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}
.btn.is-loading .btn__label { opacity: 0.6; }
.btn.is-loading .btn__arrow { display: none; }
.btn.is-loading .btn__spinner { display: inline-block; }
@keyframes spin {
  to { transform: rotate(360deg); }
}
.form__privacy {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: var(--space-md);
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

/* --- Error --- */
.form-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  color: var(--color-error);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-lg) var(--space-md);
  font-size: 0.95rem;
  font-weight: 500;
}

/* --- Footer --- */
.footer {
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .site-header__inner { padding: 12px var(--space-md); }
  .site-header__logo { height: 28px; }

  .hero {
    padding: var(--space-lg) var(--space-md) calc(var(--space-lg) + 20px);
  }
  .hero__title { font-size: 1.7rem; line-height: 1.4; }
  .hero__lead { font-size: 0.95rem; }
  .hero__watermark { width: 320px; right: -100px; }

  main { padding: 0 var(--space-sm); }
  .form {
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-md);
    margin-top: -20px;
  }
  .form__section {
    margin: 0 calc(var(--space-md) * -1);
    padding: var(--space-md) var(--space-md) var(--space-lg);
  }
  .form__section-head { gap: var(--space-sm); margin-bottom: var(--space-md); }
  .form__section-num { width: 36px; height: 36px; font-size: 0.8rem; }
  .field { margin-bottom: var(--space-md); }
  .field--row, .field--3col {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  .btn { width: 100%; min-width: 0; }
}

@media (max-width: 400px) {
  .choices { grid-template-columns: 1fr; }
}