:root {
  --bg: #15141a;
  --bg-panel: #1c1b22;
  --bg-field: #1a1920;
  --border: #34323c;
  --text: #f2f0ec;
  --text-muted: #b5b2bd;
  --accent: #FF6600;
  --error: #ff9466;

  --font-display: "Zen Old Mincho", serif;
  --font-body: "Zen Kaku Gothic New", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.form-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 96px clamp(20px, 5vw, 64px);
}

.form-page__frame {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.form-page__eyebrow {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 16px;
}

.form-page__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(26px, 4vw, 34px);
  margin: 0 0 20px;
}

.form-page__lead {
  color: var(--text-muted);
  font-size: 15px;
  margin: 0 0 48px;
}

/* ===== エラーメッセージ ===== */
.form-alert {
  border: 1px solid var(--error);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.form-alert__title {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--error);
}

.form-alert ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== フォーム項目 ===== */
.form-row {
  margin-bottom: 28px;
}

.form-row label {
  display: block;
  font-size: 14px;
  margin-bottom: 10px;
}

.required,
.optional {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.04em;
  margin-left: 10px;
  padding: 2px 8px;
  vertical-align: middle;
}

.required {
  color: var(--accent);
  border: 1px solid var(--accent);
}

.optional {
  color: var(--text-muted);
  border: 1px solid var(--border);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
  width: 100%;
  background: var(--bg-field);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 14px 16px;
  transition: border-color 0.2s ease;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  line-height: 1.8;
}

.form-row--checkbox {
  margin-top: 40px;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
}

.checkbox-label input {
  margin-top: 3px;
}

.checkbox-label a {
  color: var(--text);
  text-decoration: underline;
}

/* ===== 確認画面 ===== */
.confirm-list {
  margin: 0 0 48px;
  border-top: 1px solid var(--border);
}

.confirm-list__row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.confirm-list__row dt {
  color: var(--text-muted);
  font-size: 13px;
}

.confirm-list__row dd {
  margin: 0;
}

.confirm-list__pre {
  white-space: pre-line;
}

@media (max-width: 480px) {
  .confirm-list__row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

/* ===== ボタン ===== */
.form-actions {
  display: flex;
  justify-content: flex-start;
}

.form-actions--split {
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  padding: 16px 36px;
  font-size: 14.5px;
  font-family: var(--font-body);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover { opacity: 0.85; }

.btn--outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn--outline:hover { border-color: var(--accent); color: var(--accent); }

.form-page--complete .form-page__frame {
  text-align: center;
}

.form-page--complete .form-actions {
  justify-content: center;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}