/* 印紙税額 早見ツール - ミニマル・クリーン */
:root{--color-primary:#4A90D9;--color-primary-dark:#3A7BC8;--color-primary-bg:#EBF2FB;--color-bg:#FAFBFD;--color-surface:#FFFFFF;--color-text:#1A1A2E;--color-text-secondary:#6B7280;--color-text-muted:#9CA3AF;--color-border:#E5E7EB;--color-divider:#F3F4F6;--color-accent:#D97706;--color-accent-bg:#FEF3C7;--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 4px 12px rgba(0,0,0,0.06);--shadow-focus:0 0 0 3px rgba(74,144,217,0.15);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--font-sans:'Inter','Noto Sans JP',-apple-system,BlinkMacSystemFont,sans-serif;--transition:0.2s ease}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);line-height:1.7;min-height:100vh;-webkit-font-smoothing:antialiased}
.container{max-width:720px;margin:0 auto;padding:0 20px}
.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;letter-spacing:-0.02em;margin-bottom:8px}
.header-subtitle{font-size:0.95rem;color:var(--color-text-secondary)}
.section-title{font-size:1.1rem;font-weight:600;margin-bottom:16px}

/* Search */
.search-section{background:var(--color-surface);border-radius:var(--radius-lg);padding:32px 28px;box-shadow:var(--shadow-md);border:1px solid var(--color-border);margin-bottom:20px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:0.8rem;font-weight:500;color:var(--color-text-secondary);margin-bottom:6px}
.form-group select,.form-group input{width:100%;padding:10px 12px;border:1.5px solid var(--color-border);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:0.95rem;color:var(--color-text);background:var(--color-surface);transition:all var(--transition)}
.form-group select:focus,.form-group input:focus{outline:none;border-color:var(--color-primary);box-shadow:var(--shadow-focus)}
.amount-input-wrap{position:relative}
.amount-unit{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:0.85rem;color:var(--color-text-muted);pointer-events:none}
.amount-input-wrap input{padding-right:32px}
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}

/* Calc Button */
.calc-btn{width:100%;padding:14px 24px;background:var(--color-primary);color:#fff;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)}

/* Result */
.result-area{margin-top:24px;animation:fadeIn 0.3s ease}
.result-area.hidden{display:none}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.stamp-result-card{background:var(--color-accent-bg);border:2px solid var(--color-accent);border-radius:var(--radius-md);padding:24px;text-align:center}
.stamp-label{display:block;font-size:0.85rem;color:var(--color-text-secondary);margin-bottom:4px}
.stamp-value{display:block;font-size:2.5rem;font-weight:700;color:var(--color-accent);line-height:1.2}
.stamp-note{margin-top:12px;font-size:0.82rem;color:var(--color-text-secondary);line-height:1.6}

/* Tables */
.table-section{margin-top:20px;background:var(--color-surface);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-md);border:1px solid var(--color-border)}
.table-note{font-size:0.8rem;color:var(--color-accent);margin-bottom:12px;margin-top:-8px}
.table-wrapper{overflow-x:auto;-webkit-overflow-scrolling:touch}
.stamp-table{width:100%;border-collapse:collapse;font-size:0.85rem}
.stamp-table th{padding:10px 14px;text-align:right;font-weight:600;font-size:0.78rem;color:var(--color-text-secondary);border-bottom:2px solid var(--color-border);white-space:nowrap}
.stamp-table th:first-child{text-align:left}
.stamp-table td{padding:9px 14px;text-align:right;border-bottom:1px solid var(--color-divider)}
.stamp-table td:first-child{text-align:left;color:var(--color-text)}
.stamp-table td:last-child{font-weight:600;color:var(--color-primary-dark)}
.stamp-table tbody tr:hover{background:var(--color-primary-bg)}
.stamp-table .highlight{background:var(--color-accent-bg)}

/* Tips */
.tips-section{margin-top:24px}
.tips-grid{display:grid;gap:12px;margin-top:16px}
.tip-card{background:var(--color-surface);border-radius:var(--radius-md);padding:20px;border:1px solid var(--color-border);box-shadow:var(--shadow-sm)}
.tip-card h3{font-size:0.95rem;font-weight:600;margin-bottom:8px}
.tip-card p{font-size:0.85rem;color:var(--color-text-secondary);line-height:1.7}
.tip-card strong{color:var(--color-accent)}

/* Ad / Footer */
.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)}
.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}
.footer-note a{color:var(--color-primary);text-decoration:none}
.footer-nav{margin-top:12px;display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap}
.footer-nav a{font-size:0.85rem;color:var(--color-primary);text-decoration:none}
.footer-nav a.muted{color:var(--color-text-muted)}
.nav-sep{color:var(--color-text-muted);font-size:0.8rem}
@media(max-width:600px){
  .header{padding:32px 0 24px}.header h1{font-size:1.4rem}
  .search-section,.table-section{padding:20px 16px}
  .stamp-value{font-size:1.8rem}
  .stamp-table th,.stamp-table td{padding:8px 10px;font-size:0.8rem}
  .footer-nav{flex-direction:column;gap:6px}.nav-sep{display:none}
}