/**
 * 대출 비교 계산기 - 스타일
 *
 * 설계 원칙:
 * - 모바일 퍼스트 (85% 사용자)
 * - 차이(Δ)가 주인공 (가장 크게)
 * - 중립 색상 (의견 없음)
 * - 터치 타겟 48px 이상
 * - 한국어 가독성 최적화
 */

/* === 리셋 & 기본 === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', '맑은 고딕', sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #f5f5f7;
}

/* === 레이아웃 === */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
}

/* === 헤더 === */
.hero {
  text-align: center;
  padding: 1.5rem 0 1rem;
}

.hero h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.subtitle {
  font-size: 0.9375rem;
  color: #666;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
}

/* === 요약 Hero (차이가 주인공) === */
.summary-hero {
  margin-bottom: 1.5rem;
}

.summary-card {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border-radius: 16px;
  padding: 1.5rem;
  text-align: center;
  color: #fff;
}

.summary-label {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 0.5rem;
}

.summary-amount {
  font-size: 2.25rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: #ffd700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  word-break: keep-all;
}

.summary-context {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.8);
}

/* 상태별 색상 */
.summary-card.a-higher {
  background: linear-gradient(135deg, #1565c0 0%, #0d47a1 100%);
}

.summary-card.b-higher {
  background: linear-gradient(135deg, #00796b 0%, #004d40 100%);
}

.summary-card.equal {
  background: linear-gradient(135deg, #455a64 0%, #37474f 100%);
}

.summary-card.equal .summary-amount {
  color: #fff;
}

@media (min-width: 768px) {
  .summary-amount {
    font-size: 3rem;
  }
}

/* === 탭 전환 (모바일) === */
.loan-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab-btn {
  flex: 1;
  padding: 0.875rem 1rem;
  border: 2px solid #ddd;
  background: #fff;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 48px;
}

.tab-btn.active {
  border-color: #1565c0;
  background: #e3f2fd;
  color: #1565c0;
}

.tab-btn[data-tab="loan-b"].active {
  border-color: #00796b;
  background: #e0f2f1;
  color: #00796b;
}

/* 데스크탑: 탭 숨김 */
@media (min-width: 768px) {
  .loan-tabs {
    display: none;
  }
}

/* === 입력 그리드 === */
.input-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

/* 모바일: 탭으로 전환 */
@media (max-width: 767px) {
  .loan-card {
    display: none;
  }
  .loan-card.active {
    display: block;
  }
}

/* 데스크탑: 병렬 표시 */
@media (min-width: 768px) {
  .input-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .loan-card {
    display: block !important;
  }
}

/* === 대출 카드 === */
.loan-card {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  border: 2px solid transparent;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.loan-a {
  border-color: #e3f2fd;
}

.loan-b {
  border-color: #e0f2f1;
}

.loan-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #eee;
}

.loan-a .loan-title {
  color: #1565c0;
}

.loan-b .loan-title {
  color: #00796b;
}

/* === 입력 필드 === */
.input-group {
  margin-bottom: 1rem;
}

.input-group:last-child {
  margin-bottom: 0;
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.375rem;
}

.input-wrapper {
  display: flex;
  align-items: center;
  background: #f8f9fa;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  min-height: 48px;
}

.input-wrapper input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.875rem;
  font-size: 1rem;
  width: 100%;
  min-height: 48px;
}

.input-wrapper .suffix {
  padding: 0.875rem;
  background: #eee;
  color: #666;
  font-size: 0.875rem;
  font-weight: 500;
  min-width: 44px;
  text-align: center;
}

input:focus {
  outline: 2px solid #1565c0;
  outline-offset: -1px;
}

.input-hint {
  font-size: 0.75rem;
  color: #888;
  margin-top: 0.25rem;
}

/* 년/개월 행 */
.input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-or {
  font-size: 0.75rem;
  color: #999;
  flex-shrink: 0;
}

.flex-1 {
  flex: 1;
}

/* 숫자 입력 스피너 숨김 */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield;
}

/* === 라디오 그룹 === */
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.radio-label {
  display: flex;
  align-items: center;
  padding: 0.625rem 1rem;
  background: #f8f9fa;
  border: 1px solid #ddd;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.15s ease;
  min-height: 44px;
}

.radio-label:has(input:checked) {
  background: #e3f2fd;
  border-color: #1565c0;
  color: #1565c0;
}

.loan-b .radio-label:has(input:checked) {
  background: #e0f2f1;
  border-color: #00796b;
  color: #00796b;
}

.radio-label input {
  margin-right: 0.5rem;
  accent-color: #1565c0;
}

.loan-b .radio-label input {
  accent-color: #00796b;
}

/* === 고급 옵션 === */
.advanced-options {
  margin-top: 1rem;
  border-top: 1px solid #eee;
  padding-top: 0.75rem;
}

.advanced-options summary {
  font-size: 0.875rem;
  font-weight: 500;
  color: #666;
  cursor: pointer;
  padding: 0.5rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.advanced-options summary::before {
  content: "▶";
  font-size: 0.625rem;
  transition: transform 0.15s ease;
}

.advanced-options[open] summary::before {
  transform: rotate(90deg);
}

.advanced-content {
  padding-top: 0.75rem;
}

/* === 결과 섹션 === */
.results {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.results-title {
  font-size: 1rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 1rem;
  text-align: center;
}

/* 결과 테이블 */
.results-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.results-table th,
.results-table td {
  padding: 0.75rem 0.5rem;
  text-align: right;
  border-bottom: 1px solid #eee;
}

.results-table th {
  font-weight: 600;
  color: #666;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.results-table .row-label {
  text-align: left;
  font-weight: 500;
  color: #333;
}

.results-table .sub-label {
  display: block;
  font-size: 0.6875rem;
  color: #888;
  font-weight: 400;
}

.results-table .col-a {
  color: #1565c0;
}

.results-table .col-b {
  color: #00796b;
}

.results-table .col-diff {
  color: #333;
  font-weight: 600;
}

.diff-cell {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.diff-cell.positive {
  color: #d32f2f;
}

.diff-cell.negative {
  color: #388e3c;
}

/* 상환표 버튼 */
.schedule-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}

.btn-secondary {
  flex: 1;
  padding: 0.75rem 1rem;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #333;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.15s ease;
}

.btn-secondary:hover {
  background: #eee;
}

/* === 상환 스케줄 섹션 === */
.schedule-section {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.schedule-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #eee;
}

.schedule-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

.schedule-actions-inline {
  display: flex;
  gap: 0.5rem;
}

.btn-small {
  padding: 0.5rem 0.75rem;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
}

.btn-close {
  background: #fff;
}

.schedule-table-wrapper {
  max-height: 400px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.schedule-table th,
.schedule-table td {
  padding: 0.625rem 0.5rem;
  text-align: right;
  border-bottom: 1px solid #f0f0f0;
  font-variant-numeric: tabular-nums;
}

.schedule-table th {
  position: sticky;
  top: 0;
  background: #f8f9fa;
  font-weight: 600;
  font-size: 0.75rem;
  color: #666;
}

.schedule-table tbody tr:nth-child(even) {
  background: #fafafa;
}

.schedule-table tbody tr.grace-period {
  background: #fff8e1;
}

/* === 설명 섹션 === */
.explanation {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.explanation h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #333;
}

.explanation ul {
  list-style: none;
}

.explanation li {
  padding: 0.5rem 0;
  padding-left: 1.25rem;
  position: relative;
  font-size: 0.9375rem;
  color: #555;
  line-height: 1.5;
}

.explanation li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #999;
}

/* === 광고 영역 === */
.ad-slot {
  margin-bottom: 1.5rem;
}

.ad-placeholder {
  background: #f0f0f0;
  border: 1px dashed #ccc;
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  color: #999;
  font-size: 0.875rem;
}

/* === FAQ === */
.faq {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.faq h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #333;
}

.faq details {
  border-bottom: 1px solid #eee;
}

.faq details:last-of-type {
  border-bottom: none;
}

.faq summary {
  padding: 1rem;
  margin: 0 -1rem;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.9375rem;
  color: #333;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 48px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-size: 1.25rem;
  color: #999;
  font-weight: 300;
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details div {
  padding: 0 1rem 1rem;
}

.faq details p {
  font-size: 0.9375rem;
  color: #555;
  line-height: 1.7;
}

/* === 면책 조항 === */
.disclaimer {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 1.25rem;
  font-size: 0.8125rem;
  color: #666;
  line-height: 1.6;
}

.disclaimer h3 {
  font-size: 0.875rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 0.75rem;
}

.disclaimer ul {
  list-style: none;
  margin: 0.75rem 0;
}

.disclaimer li {
  padding: 0.25rem 0;
  padding-left: 1rem;
  position: relative;
}

.disclaimer li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #999;
}

.privacy-note {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid #e0e0e0;
  font-size: 0.75rem;
  color: #888;
}

.contact-info {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: #888;
}

.contact-info a {
  color: #1565c0;
  text-decoration: none;
}

.contact-info a:hover {
  text-decoration: underline;
}

.copyright {
  margin-top: 0.75rem;
  font-size: 0.6875rem;
  color: #aaa;
}

/* === 접근성 === */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media (prefers-contrast: high) {
  .loan-card {
    border-width: 3px;
  }
  .summary-card {
    border: 2px solid #fff;
  }
}

summary:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid #1565c0;
  outline-offset: 2px;
}

/* === 검증 배지 === */
.validation-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: 8px;
  font-size: 0.8125rem;
  margin-bottom: 1rem;
}

.validation-badge.valid {
  background: #e8f5e9;
  border: 1px solid #4caf50;
  color: #2e7d32;
}

.validation-badge.invalid {
  background: #fff3e0;
  border: 1px solid #ff9800;
  color: #e65100;
}

.validation-badge .badge-icon {
  font-size: 1rem;
  font-weight: 700;
}

.validation-badge .badge-text {
  font-weight: 600;
}

.validation-badge .badge-detail {
  font-size: 0.75rem;
  color: #666;
  margin-left: auto;
}

.validation-badge.valid .badge-detail {
  color: #4caf50;
}

.validation-badge.invalid .badge-detail {
  color: #e65100;
}

/* === 만기일시 경고 배너 === */
.bullet-warning {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem;
  background: #fff8e1;
  border: 1px solid #ffca28;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  line-height: 1.5;
}

.bullet-warning .warning-icon {
  flex-shrink: 0;
}

.bullet-warning .warning-text {
  color: #f57f17;
}

/* === 상환표 페이지네이션 === */
.schedule-pagination {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.btn-page {
  padding: 0.5rem 0.875rem;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 36px;
}

.btn-page:hover {
  background: #eee;
}

.btn-page.active {
  background: #1565c0;
  border-color: #1565c0;
  color: #fff;
}

/* === 상환표 특수 행 === */
.schedule-table .summary-row {
  background: #f5f5f5 !important;
  border-top: 2px solid #1565c0;
}

.schedule-table .summary-row td {
  padding: 0.875rem 0.5rem;
}

.schedule-table .highlight-row {
  background: #fff3e0 !important;
}

.schedule-table .highlight-row td {
  font-weight: 600;
}

.schedule-table .more-row {
  background: transparent !important;
}

.schedule-table .more-info {
  text-align: center !important;
  color: #888;
  font-size: 0.75rem;
  padding: 1rem !important;
}

/* === 배지 스타일 === */
.badge-grace {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  background: #fff8e1;
  border: 1px solid #ffca28;
  border-radius: 4px;
  font-size: 0.625rem;
  font-weight: 600;
  color: #f57f17;
  margin-left: 0.25rem;
  vertical-align: middle;
}

.schedule-warning {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 400;
  color: #e65100;
  margin-left: 0.5rem;
}

/* === 서브 값 (월 납부액 이자만 표기) === */
.sub-value {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  color: #888;
  margin-top: 0.125rem;
}

/* === 만기일시 강조 === */
.bullet-label {
  color: #e65100;
}

.bullet-highlight {
  background: #fff3e0;
}

.bullet-amount {
  color: #d84315;
  font-size: 1rem;
}

#row-final-payment {
  background: #fffde7;
  border-left: 3px solid #ff9800;
}

/* === 입력 에러 상태 === */
.input-wrapper.input-error {
  border-color: #d32f2f;
  background: #ffebee;
}

.input-wrapper.input-error input {
  color: #d32f2f;
}

.error-message {
  font-size: 0.75rem;
  color: #d32f2f;
  margin-top: 0.25rem;
}

/* === 값 변경 하이라이트 === */
@keyframes valueChange {
  0% { background-color: transparent; }
  30% { background-color: #fff3e0; }
  100% { background-color: transparent; }
}

.value-changed {
  animation: valueChange 0.5s ease-out;
}

/* === 유틸리티 === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}