/* ========================================
   AI参謀ラボ — Contact Form
   ======================================== */

.contact-main {
  padding: 120px 0 96px;
  background: var(--color-bg-alt);
  min-height: calc(100vh - 64px);
}

.contact-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Intro --- */
.contact-intro {
  text-align: center;
  margin-bottom: 48px;
}

.contact-intro h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin: 12px 0 16px;
  letter-spacing: -0.02em;
}

.contact-intro p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.contact-points {
  list-style: none;
  display: inline-flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 24px;
  padding: 20px 28px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: left;
}

.contact-points li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  display: flex;
  gap: 8px;
}

.contact-points li::before {
  content: "✓";
  color: var(--color-success);
  flex-shrink: 0;
  font-weight: 700;
}

.contact-points strong {
  color: var(--color-text);
}

/* --- Form --- */
.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
}

.form-section + .form-section {
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border-light);
}

.form-section-title {
  font-size: 1.125rem;
  margin-bottom: 24px;
  color: var(--color-text);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

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

.form-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.required {
  font-size: 0.6875rem;
  font-weight: 600;
  color: #dc2626;
  background: #fef2f2;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.optional {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  background: var(--color-bg-alt);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.form-help {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-top: 2px;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.contact-form select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%239ca3af' d='M6 8L0 0h12z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.7;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.contact-form input.invalid,
.contact-form select.invalid,
.contact-form textarea.invalid {
  border-color: #dc2626;
  box-shadow: 0 0 0 3px #fef2f2;
}

.form-error {
  font-size: 0.8125rem;
  color: #dc2626;
  min-height: 1em;
  margin-top: 4px;
}

.form-error:empty {
  display: none;
}

/* --- Checkbox group --- */
.form-checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9375rem;
}

.form-checkbox:hover {
  border-color: var(--color-text-tertiary);
  background: var(--color-bg-alt);
}

.form-checkbox input[type="checkbox"] {
  margin-top: 3px;
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"]:checked + span {
  color: var(--color-text);
  font-weight: 500;
}

.form-checkbox:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

/* --- Actions --- */
.form-actions {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.form-actions .btn {
  min-width: 280px;
}

.form-privacy {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  line-height: 1.7;
}

/* --- Thank you --- */
.thank-you {
  text-align: center;
  padding: 64px 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.thank-you-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.25rem;
  color: #fff;
  background: linear-gradient(135deg, var(--color-success), #10b981);
  border-radius: 50%;
  font-weight: 700;
}

.thank-you h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.thank-you p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

.thank-you-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .contact-main {
    padding: 96px 0 64px;
  }
  .contact-form {
    padding: 32px 24px;
  }
  .thank-you {
    padding: 48px 24px;
  }
  .form-actions .btn {
    min-width: 0;
    width: 100%;
  }
}