/* ===================================
   年齢・年号・入学卒業年 早見ツール
   テーマ: ミニマル・クリーン
   =================================== */

/* --- Design Tokens --- */
:root {
  --color-primary: #4A90D9;
  --color-primary-light: #6BA5E7;
  --color-primary-dark: #3A7BC8;
  --color-primary-bg: #EBF2FB;
  --color-primary-bg-hover: #D6E5F7;

  --color-bg: #FAFBFD;
  --color-surface: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-focus: var(--color-primary);
  --color-divider: #F3F4F6;

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-accent-gold: #D4A849;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-focus: 0 0 0 3px rgba(74, 144, 217, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Layout --- */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Header --- */
.header {
  text-align: center;
  padding: 48px 0 32px;
}

.header-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 8px;
}

.header-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.sp-only {
  display: none;
}

/* --- Section Title --- */
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
}

/* --- Input Section --- */
.input-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

/* --- Mode Toggle --- */
.input-mode-toggle {
  display: flex;
  gap: 0;
  background: var(--color-divider);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 24px;
}

.mode-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}

.mode-btn.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

.mode-btn:hover:not(.active) {
  color: var(--color-text);
}

/* --- Forms --- */
.input-form.hidden {
  display: none;
}

.input-row {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.input-group {
  display: flex;
  flex-direction: column;
  flex: 1;
  position: relative;
}

.input-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: all var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.input-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.input-group .unit {
  position: absolute;
  right: 12px;
  bottom: 10px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  pointer-events: none;
}

.input-group input[type="number"] {
  padding-right: 28px;
}

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

/* --- Calculate Button --- */
.calc-btn {
  width: 100%;
  padding: 14px 24px;
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.calc-btn:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-icon {
  font-size: 1.1rem;
}

/* --- Results Section --- */
.results-section {
  margin-top: 24px;
  animation: fadeInUp 0.4s ease;
}

.results-section.hidden {
  display: none;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Result Cards --- */
.result-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  margin-bottom: 16px;
}

/* --- Age Display --- */
.age-display {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.age-main {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.age-number {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.03em;
}

.age-label {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text);
}

.age-detail {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.age-extra {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.extra-item {
  flex: 1;
  min-width: 140px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-align: center;
}

.extra-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.extra-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.extra-unit {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-left: 2px;
}

/* --- Era Display --- */
.era-display {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.era-main {
  flex: 1;
  min-width: 160px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.era-main .era-name {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.era-main .era-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.era-seireki {
  flex: 1;
  min-width: 160px;
  background: var(--color-divider);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.era-seireki .era-name {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.era-seireki .era-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text);
}

/* --- School Table --- */
.school-note {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  padding: 10px 14px;
  background: #FEF9E7;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-warning);
  display: none;
}

.school-note.visible {
  display: block;
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.school-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.school-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.school-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text);
}

.school-table tbody tr:last-child td {
  border-bottom: none;
}

.school-table tbody tr:hover {
  background: var(--color-primary-bg);
}

.school-table .school-name {
  font-weight: 600;
  white-space: nowrap;
}

.school-table .year-wareki {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: block;
  margin-top: 2px;
}

/* Row highlight for current school */
.school-table tbody tr.current-school {
  background: var(--color-primary-bg);
}

.school-table tbody tr.current-school td:first-child::after {
  content: ' ◀ 現在';
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* --- Ad Space --- */
.ad-space {
  margin: 20px 0;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-placeholder {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: 16px 24px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* --- Footer --- */
.footer {
  padding: 32px 0;
  text-align: center;
}

.footer-content {
  margin-top: 16px;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer-note {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 6px;
}

/* --- Error Message --- */
.error-message {
  background: #FEF2F2;
  color: #DC2626;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 16px;
  border-left: 3px solid #DC2626;
  display: none;
}

.error-message.visible {
  display: block;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .header {
    padding: 32px 0 24px;
  }

  .header h1 {
    font-size: 1.4rem;
  }

  .sp-only {
    display: inline;
  }

  .input-section {
    padding: 24px 20px;
  }

  .input-row {
    flex-wrap: wrap;
    gap: 10px;
  }

  .input-group {
    min-width: calc(50% - 5px);
  }

  #form-wareki .input-group {
    min-width: calc(50% - 5px);
  }

  .result-card {
    padding: 20px;
  }

  .age-number {
    font-size: 2.8rem;
  }

  .age-display {
    flex-direction: column;
    gap: 8px;
  }

  .era-display {
    flex-direction: column;
    gap: 10px;
  }

  .extra-item {
    min-width: 100%;
  }

  .school-table th,
  .school-table td {
    padding: 10px 12px;
    font-size: 0.85rem;
  }
}

@media (max-width: 380px) {
  .container {
    padding: 0 12px;
  }

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

  .input-group {
    min-width: 100%;
  }
}