/* ========================================
   Base & Variables
   ======================================== */
:root {
  --color-primary: #1a2744;
  --color-primary-light: #2a3f6a;
  --color-accent: #c8956c;
  --color-accent-light: #e6c9a8;
  --color-bg: #f5f0eb;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #d4cdc5;
  --color-error: #d94444;
  --color-success: #2d8a56;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  min-height: 100vh;
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

/* ========================================
   Header
   ======================================== */
.header {
  text-align: center;
  margin-bottom: 48px;
}

.header-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.header h1 {
  font-size: 1.5rem;
  color: var(--color-primary);
  line-height: 1.6;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.description {
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-text-light);
  background: var(--color-white);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  line-height: 2;
}

.notice {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* ========================================
   Form Groups
   ======================================== */
.form-group {
  background: var(--color-white);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.form-group fieldset {
  border: none;
}

.form-label,
.form-group fieldset legend {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.required {
  color: var(--color-error);
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 4px;
}

.optional {
  color: var(--color-text-light);
  font-size: 0.8rem;
  font-weight: 400;
  margin-left: 4px;
}

.form-hint {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

/* ========================================
   Input / Select / Textarea
   ======================================== */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(200, 149, 108, 0.2);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: #aaa;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

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

.other-input {
  margin-top: 12px;
}

/* ========================================
   Radio Buttons
   ======================================== */
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95rem;
  transition: all var(--transition);
  user-select: none;
}

.radio-label:hover {
  border-color: var(--color-accent-light);
}

.radio-label input[type="radio"] {
  display: none;
}

.radio-custom {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  position: relative;
  transition: all var(--transition);
  flex-shrink: 0;
}

.radio-label input[type="radio"]:checked ~ .radio-custom {
  border-color: var(--color-accent);
}

.radio-label input[type="radio"]:checked ~ .radio-custom::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.radio-label:has(input[type="radio"]:checked) {
  border-color: var(--color-accent);
  background: rgba(200, 149, 108, 0.08);
}

/* ========================================
   Validation States
   ======================================== */
.form-input:invalid:not(:placeholder-shown),
.form-textarea:invalid:not(:placeholder-shown) {
  border-color: var(--color-error);
}

.form-group.error .form-input,
.form-group.error .form-select,
.form-group.error .form-textarea {
  border-color: var(--color-error);
}

.error-message {
  color: var(--color-error);
  font-size: 0.8rem;
  margin-top: 8px;
  display: none;
}

.form-group.error .error-message {
  display: block;
}

/* ========================================
   Submit Button
   ======================================== */
.form-actions {
  margin-top: 32px;
  text-align: center;
}

.submit-btn {
  display: inline-block;
  padding: 16px 64px;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: inherit;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(26, 39, 68, 0.3);
  letter-spacing: 0.05em;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 39, 68, 0.4);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ========================================
   Success Message
   ======================================== */
.success-message {
  text-align: center;
  background: var(--color-white);
  padding: 48px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.success-icon {
  width: 64px;
  height: 64px;
  background: var(--color-success);
  color: var(--color-white);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
}

.success-message h2 {
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.success-message p {
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 2;
}

.reset-btn {
  padding: 12px 36px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--color-primary);
  background: transparent;
  border: 2px solid var(--color-primary);
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
}

.reset-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  text-align: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 600px) {
  .container {
    padding: 24px 16px 40px;
  }

  .header h1 {
    font-size: 1.2rem;
  }

  .description {
    padding: 20px 16px;
    font-size: 0.9rem;
  }

  .form-group {
    padding: 20px 16px;
  }

  .radio-group {
    gap: 8px;
  }

  .radio-label {
    padding: 8px 14px;
    font-size: 0.9rem;
  }

  .submit-btn {
    width: 100%;
    padding: 16px 24px;
  }
}