:root{
  --primary:#1769e0;
  --primary-dark:#0f4fae;
  --success:#198754;
  --danger:#c62828;
  --bg:#f4f7fb;
  --card:#ffffff;
  --text:#172033;
  --muted:#667085;
  --border:#d9e2ef;
  --soft:#eef4ff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,#f8fbff 0%,var(--bg) 100%);
  min-height:100vh;
}
button,input,textarea{font:inherit}
button{touch-action:manipulation}
.app-shell{width:min(1180px,calc(100% - 24px));margin:0 auto;padding:24px 0 8px}
.app-header{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:14px}
.brand-icon{width:54px;height:54px;border-radius:14px;background:var(--soft);display:grid;place-items:center;color:var(--primary);box-shadow:0 8px 24px rgba(23,105,224,.12)}
.brand-icon svg{width:34px;height:34px}
h1{font-size:clamp(1.45rem,2.8vw,2.05rem);margin:0 0 4px}
.subtitle{margin:0;color:var(--muted);font-size:.97rem}
.help-btn{border:1px solid var(--border);background:#fff;color:var(--text);border-radius:10px;padding:10px 15px;cursor:pointer;font-weight:700}
.help-btn:hover{background:#f8fafc}
.main-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:0 10px 30px rgba(32,52,80,.08);padding:22px}
.mode-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--border);margin-bottom:20px}
.tab-btn{position:relative;border:0;background:transparent;padding:13px 10px 16px;font-weight:800;cursor:pointer;color:#344054}
.tab-btn.active{color:var(--primary)}
.tab-btn.active::after{content:"";position:absolute;left:7px;right:7px;bottom:-1px;height:3px;background:var(--primary);border-radius:999px}
.panel{display:none}
.panel.active{display:block}
.drop-zone{border:2px dashed #b9c8dd;border-radius:14px;min-height:355px;padding:28px 18px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:#fbfdff;outline:none;transition:.2s}
.drop-zone:focus,.drop-zone.dragover{border-color:var(--primary);background:var(--soft)}
.drop-icon{width:84px;height:84px;border-radius:50%;background:var(--soft);display:grid;place-items:center;color:var(--primary);margin-bottom:18px}
.drop-icon svg{width:42px;height:42px}
.drop-title{font-weight:800;font-size:1.05rem;margin:0 0 8px}
.drop-sub{margin:0 0 16px;color:var(--muted)}
.btn{border:0;border-radius:10px;padding:12px 18px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:.16s;text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#fff;color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:#f8fafc}
.btn-success{background:var(--success);color:#fff}
.btn-danger{background:var(--danger);color:#fff}
.btn:disabled{opacity:.5;cursor:not-allowed}
.file-note{margin-top:14px;color:var(--muted);font-size:.88rem}
.preview-wrap{margin-top:16px;display:none}
.preview-wrap.show{display:block}
.preview-box{position:relative;border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#111;min-height:180px;display:flex;align-items:center;justify-content:center}
.preview-box img,.preview-box canvas,.preview-box video{max-width:100%;max-height:420px;display:block}
.scan-frame{position:absolute;inset:16%;border:3px solid rgba(255,255,255,.9);border-radius:18px;box-shadow:0 0 0 9999px rgba(0,0,0,.18);pointer-events:none}
.camera-area{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#111;min-height:355px;display:grid;place-items:center;position:relative}
.camera-placeholder{text-align:center;color:#e9eef7;padding:30px}
.camera-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.status{border-radius:10px;padding:13px 15px;font-weight:700;margin-bottom:16px;border:1px solid var(--border);background:#f8fafc;color:#475467}
.status.success{background:#effaf3;border-color:#79d598;color:#176b36}
.status.error{background:#fff1f1;border-color:#ef9a9a;color:#9d1c1c}
.result-title{font-size:1.28rem;margin:0 0 16px}
.label{display:block;font-weight:800;margin-bottom:8px}
.result-text{width:100%;min-height:120px;resize:vertical;border:1px solid var(--border);border-radius:10px;padding:13px;background:#fbfdff;color:var(--text);line-height:1.55}
.result-meta{display:flex;gap:10px;align-items:center;margin:14px 0 18px;flex-wrap:wrap}
.badge{display:inline-flex;padding:6px 12px;border-radius:999px;background:var(--soft);color:var(--primary);font-weight:800;font-size:.86rem}
.action-stack{display:grid;gap:10px}
.copy-feedback{min-height:1.4em;margin:8px 0 0;color:var(--success);font-weight:800;font-size:.9rem}
.details{margin-top:22px;border-top:1px solid var(--border);padding-top:14px}
.details-row{display:flex;justify-content:space-between;gap:16px;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:.92rem}
.details-row span:first-child{color:var(--muted)}
.guide{margin-top:18px;border:1px solid var(--border);border-radius:12px;padding:16px;background:#fbfdff}
.guide h2{font-size:1rem;margin:0 0 12px}
.guide ol{margin:0;padding-left:1.4em;color:#475467;line-height:1.8}
.modal{position:fixed;inset:0;background:rgba(16,24,40,.48);display:none;align-items:center;justify-content:center;padding:18px;z-index:100}
.modal.open{display:flex}
.modal-box{background:#fff;border-radius:16px;padding:22px;width:min(560px,100%);max-height:85vh;overflow:auto;box-shadow:0 24px 70px rgba(0,0,0,.25)}
.modal-box h2{margin-top:0}
.modal-close{float:right;border:0;background:#eef2f6;border-radius:8px;padding:7px 10px;cursor:pointer}
footer{text-align:center;color:#1565c0;font-size:.9rem;padding:14px 0 22px}
footer a{color:#1565c0;font-weight:700;text-decoration:none}
.ad-panel{max-width:1180px;margin:12px auto 0;border:1px solid #d7e6f8;border-radius:10px;background:#fff;overflow:hidden}
.ad-panel[hidden]{display:none!important;margin:0!important;padding:0!important;border:0!important;height:0!important}
.ad-panel-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:5px 8px;background:#f4f8ff;border-bottom:1px solid #d7e6f8}
.ad-label,.ad-wait{font-size:.72rem;color:#4f6f91}.ad-wait{margin-left:auto;margin-right:8px}
.ad-close-btn{display:none;margin:0;padding:4px 9px;border:0;border-radius:999px;background:#1565c0;color:#fff;font-size:.72rem;font-weight:800;cursor:pointer}
.ad-body{padding:8px;min-height:90px;background:#fff}
@media(max-width:840px){
  .app-shell{width:min(100% - 16px,760px);padding-top:14px}
  .app-header{align-items:flex-start}
  .main-grid{grid-template-columns:1fr}
  .card{padding:16px}
  .drop-zone,.camera-area{min-height:300px}
  .help-btn{white-space:nowrap}
}
@media(max-width:520px){
  .brand-icon{width:46px;height:46px}
  .subtitle{font-size:.87rem}
  .help-btn{padding:8px 10px;font-size:.88rem}
  .tab-btn{font-size:.92rem}
  .camera-actions .btn{flex:1 1 100%}
}