/* ============================================
   연금 포털 - 공통 스타일 + 반응형
   타겟: 50-60대 → 큰 글씨, 넉넉한 여백
   ============================================ */

/* CSS Variables */
:root {
  --primary: #1B5E7B;
  --primary-light: #2980B9;
  --primary-dark: #0D3B4F;
  --primary-alpha: rgba(27, 94, 123, 0.1);
  --secondary: #2E8B57;
  --secondary-light: #3CB371;
  --secondary-alpha: rgba(46, 139, 87, 0.1);
  --accent: #E8890C;
  --accent-light: #F5A623;
  --danger: #DC3545;
  --danger-alpha: rgba(220, 53, 69, 0.1);
  --info: #17A2B8;
  --info-alpha: rgba(23, 162, 184, 0.1);
  --warning: #FFC107;
  --warning-alpha: rgba(255, 193, 7, 0.1);

  --text: #2C3E50;
  --text-light: #666;
  --text-muted: #999;
  --bg: #F5F7FA;
  --bg-white: #FFFFFF;
  --border: #E1E8ED;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;

  --font-base: 16px;
  --font-lg: 18px;
  --font-xl: 22px;
  --font-2xl: 28px;
  --font-3xl: 36px;
  --font-sm: 14px;

  --nav-height: 70px;
  --max-width: 1400px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-base);
  scroll-behavior: smooth;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'Malgun Gothic', '맑은 고딕', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
  padding-top: var(--nav-height);
}

/* ============================================
   네비게이션
   ============================================ */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-white);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  flex-shrink: 0;
  margin-right: 20px;
}

.brand-icon {
  font-size: 28px;
}

.brand-text {
  font-size: var(--font-xl);
  font-weight: 800;
  color: var(--primary);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  flex: 1;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  text-decoration: none;
  color: var(--text-light);
  font-size: var(--font-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: all 0.2s;
}

.nav-item:hover {
  background: var(--primary-alpha);
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary);
  color: white;
}

.nav-icon {
  font-size: 18px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 3px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}

/* ============================================
   레이아웃
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px;
}

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: var(--font-2xl);
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.page-subtitle {
  font-size: var(--font-lg);
  color: var(--text-light);
  font-weight: 400;
}

/* 카드 */
.card {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-title {
  font-size: var(--font-xl);
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.card-title .card-icon {
  margin-right: 8px;
}

/* 그리드 */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ============================================
   요약 카드 (대시보드)
   ============================================ */
.summary-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}

.summary-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.summary-card .icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.summary-card .title {
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.summary-card .desc {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

.summary-card .value {
  font-size: var(--font-2xl);
  font-weight: 800;
  color: var(--primary);
  margin-top: 12px;
}

/* 색상 변형 */
.summary-card.primary { border-top: 4px solid var(--primary); }
.summary-card.secondary { border-top: 4px solid var(--secondary); }
.summary-card.accent { border-top: 4px solid var(--accent); }
.summary-card.info { border-top: 4px solid var(--info); }
.summary-card.danger { border-top: 4px solid var(--danger); }
.summary-card.warning { border-top: 4px solid var(--warning); }

/* ============================================
   폼 요소 (큰 사이즈)
   ============================================ */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-base);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form-label .unit {
  font-size: var(--font-sm);
  color: var(--text-muted);
  font-weight: 400;
}

.form-input,
.form-select {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  font-size: var(--font-lg);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-alpha);
}

.form-input::placeholder {
  color: var(--text-muted);
  font-size: var(--font-base);
}

/* 입력 + 단위 */
.input-group {
  display: flex;
  align-items: stretch;
}

.input-group .form-input {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  border-right: none;
}

.input-suffix {
  display: flex;
  align-items: center;
  padding: 0 16px;
  background: var(--bg);
  border: 2px solid var(--border);
  border-left: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--font-base);
  color: var(--text-light);
  font-weight: 600;
  white-space: nowrap;
}

/* 레인지 슬라이더 */
.form-range-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.form-range {
  flex: 1;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 4px;
  outline: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

.range-value {
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--primary);
  min-width: 60px;
  text-align: right;
}

/* ============================================
   버튼
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 28px;
  font-size: var(--font-lg);
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(27, 94, 123, 0.3);
}

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background: #247148;
}

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-lg {
  min-height: 56px;
  padding: 16px 36px;
  font-size: var(--font-xl);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============================================
   결과 표시
   ============================================ */
.result-box {
  background: var(--primary-alpha);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
}

.result-box.success {
  background: var(--secondary-alpha);
  border-color: var(--secondary);
}

.result-box.warning {
  background: var(--warning-alpha);
  border-color: var(--warning);
}

.result-box.danger {
  background: var(--danger-alpha);
  border-color: var(--danger);
}

.result-title {
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: 16px;
}

.result-main {
  font-size: var(--font-3xl);
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.result-sub {
  font-size: var(--font-base);
  color: var(--text-light);
}

.result-details {
  margin-top: 16px;
  display: grid;
  gap: 8px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.result-row:last-child {
  border-bottom: none;
}

.result-row .label {
  color: var(--text-light);
  font-size: var(--font-base);
}

.result-row .value {
  font-weight: 700;
  font-size: var(--font-lg);
  color: var(--text);
}

.result-row .value.highlight {
  color: var(--primary);
  font-size: var(--font-xl);
}

.result-row .value.positive {
  color: var(--secondary);
}

.result-row .value.negative {
  color: var(--danger);
}

/* ============================================
   테이블
   ============================================ */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-base);
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  background: var(--bg);
  font-weight: 700;
  color: var(--text);
  position: sticky;
  top: 0;
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}

.data-table tr:hover {
  background: var(--primary-alpha);
}

.data-table .total-row {
  font-weight: 700;
  background: var(--primary-alpha);
}

/* ============================================
   차트 컨테이너
   ============================================ */
.chart-container {
  position: relative;
  height: 350px;
  margin: 20px 0;
}

.chart-container.tall {
  height: 450px;
}

/* ============================================
   탭
   ============================================ */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
}

.tab-btn {
  padding: 12px 24px;
  font-size: var(--font-base);
  font-weight: 600;
  color: var(--text-light);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--primary);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ============================================
   툴팁
   ============================================ */
.tooltip-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--info);
  color: white;
  font-size: 12px;
  font-weight: 700;
  cursor: help;
  margin-left: 4px;
  flex-shrink: 0;
}

.tooltip-popup {
  position: absolute;
  background: var(--text);
  color: white;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: var(--font-sm);
  max-width: 300px;
  z-index: 2000;
  line-height: 1.5;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  animation: tooltipFade 0.2s ease;
}

@keyframes tooltipFade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   알림 박스
   ============================================ */
.info-box {
  display: flex;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: var(--font-base);
  line-height: 1.6;
}

.info-box.info {
  background: var(--info-alpha);
  border-left: 4px solid var(--info);
}

.info-box.warning {
  background: var(--warning-alpha);
  border-left: 4px solid var(--warning);
}

.info-box.success {
  background: var(--secondary-alpha);
  border-left: 4px solid var(--secondary);
}

.info-box.danger {
  background: var(--danger-alpha);
  border-left: 4px solid var(--danger);
}

.info-box .icon {
  font-size: 24px;
  flex-shrink: 0;
}

/* ============================================
   비교 카드
   ============================================ */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: start;
}

.compare-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 2px solid var(--border);
}

.compare-card.recommended {
  border-color: var(--secondary);
  box-shadow: 0 0 0 1px var(--secondary);
}

.compare-card .badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--font-sm);
  font-weight: 700;
  border-radius: 20px;
  margin-bottom: 12px;
}

.badge.green {
  background: var(--secondary-alpha);
  color: var(--secondary);
}

.badge.blue {
  background: var(--primary-alpha);
  color: var(--primary);
}

.badge.orange {
  background: var(--accent);
  color: white;
}

.compare-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg);
  font-weight: 800;
  color: var(--text-muted);
  margin-top: 40px;
}

/* ============================================
   면책조항 (Footer)
   ============================================ */
#footer {
  margin-top: 48px;
}

.disclaimer {
  background: var(--bg);
  border-top: 2px solid var(--border);
  padding: 24px;
  text-align: center;
  font-size: var(--font-sm);
  color: var(--text-muted);
  line-height: 1.8;
}

.disclaimer strong {
  color: var(--text-light);
}

.disclaimer-meta {
  margin-top: 8px;
  font-size: 12px;
}

/* ============================================
   애니메이션
   ============================================ */
.fade-in {
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   반응형
   ============================================ */

/* 태블릿 (768px 이하) */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 8px;
    border-bottom: 2px solid var(--border);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-item {
    padding: 14px 16px;
    font-size: var(--font-base);
  }

  .container {
    padding: 16px;
  }

  .page-title {
    font-size: var(--font-xl);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .compare-grid {
    grid-template-columns: 1fr;
  }

  .compare-vs {
    margin: 0 auto;
  }

  .card {
    padding: 20px;
  }

  .result-main {
    font-size: var(--font-2xl);
  }

  .chart-container {
    height: 280px;
  }
}

/* 모바일 (480px 이하) */
@media (max-width: 480px) {
  :root {
    --font-base: 15px;
  }

  .brand-text {
    font-size: var(--font-lg);
  }

  .container {
    padding: 12px;
  }

  .card {
    padding: 16px;
    margin-bottom: 16px;
  }

  .btn {
    min-height: 44px;
    padding: 10px 20px;
  }

  .btn-group {
    flex-direction: column;
  }

  .summary-card .icon {
    font-size: 36px;
  }
}

/* 대형 화면 (1600px 이상) */
@media (min-width: 1600px) {
  :root {
    --font-base: 17px;
    --max-width: 1600px;
  }
}