:root{
  --md-primary:#00677d;
  --md-on-primary:#fff;
  --md-primary-container:#a9edff;
  --md-on-primary-container:#001f28;
  --md-secondary:#526169;
  --md-secondary-container:#d5e5ec;
  --md-tertiary:#765470;
  --md-error:#ba1a1a;
  --md-error-container:#ffdad6;
  --md-surface:#f6fafb;
  --md-surface-low:#f0f4f5;
  --md-surface-container:#e9eff1;
  --md-surface-high:#e3e9eb;
  --md-surface-lowest:#fff;
  --md-on-surface:#171c1e;
  --md-on-surface-variant:#3f484c;
  --md-outline:#6f797c;
  --md-outline-variant:#bec8cb;
  --md-shadow:0 1px 2px rgba(0,31,40,.14),0 1px 3px 1px rgba(0,31,40,.08)
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{min-height:100vh;background:var(--md-surface);padding:0 16px 32px;color:var(--md-on-surface);font-family:Roboto,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:0}
button,input,textarea{font:inherit;letter-spacing:0}
button,a{-webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(0,103,125,.24);outline-offset:2px}
.app{width:min(100%,520px);margin:0 auto}
.top-app-bar{height:72px;display:flex;align-items:center;gap:12px;margin-bottom:12px}
.top-app-bar img{width:40px;height:40px;border-radius:12px;object-fit:cover}
.top-app-bar div{min-width:0;flex:1}.top-app-bar h1{font-size:22px;font-weight:600;line-height:1.15}.top-app-bar p{margin-top:2px;color:var(--md-on-surface-variant);font-size:11px}
.top-app-bar a{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;color:var(--md-on-surface-variant);text-decoration:none}.top-app-bar a:hover{background:var(--md-surface-container)}
.preview-card{padding:16px;margin-bottom:20px;border-radius:16px;background:var(--md-surface-container)}
.preview-label{margin-bottom:12px;color:var(--md-on-surface-variant);font-size:12px;font-weight:600}
.preview-content{display:flex;align-items:center;min-height:80px;padding:12px;border-radius:12px;background:var(--md-surface-lowest);box-shadow:var(--md-shadow)}
.preview-img{width:56px;height:56px;flex:0 0 56px;border-radius:12px;background:var(--md-surface-low);object-fit:cover}
.preview-info{min-width:0;flex:1;margin-left:12px}.preview-title{margin-bottom:4px;font-size:15px;font-weight:700;overflow-wrap:anywhere}.preview-desc{color:var(--md-on-surface-variant);font-size:11px;line-height:1.45;overflow-wrap:anywhere}
.template-grid{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:7px;margin-bottom:20px}
.template-btn{display:grid;min-width:0;aspect-ratio:1;place-items:center;padding:5px;border:1px solid var(--md-outline-variant);border-radius:12px;background:var(--md-surface-lowest);cursor:pointer;transition:background .2s,border-color .2s,transform .2s}
.template-btn:hover{background:var(--md-secondary-container);transform:translateY(-1px)}
.template-btn img{width:100%;max-width:38px;aspect-ratio:1;border-radius:9px;object-fit:cover}
.template-btn.active{border:2px solid var(--md-primary);background:var(--md-primary-container)}
.form-card{padding:4px 16px 16px;border-radius:20px;background:var(--md-surface-lowest);box-shadow:var(--md-shadow)}
.form-group{margin-top:16px}.form-label{display:block;margin:0 0 7px 4px;color:var(--md-on-surface);font-size:13px;font-weight:600}.muted-label{color:var(--md-on-surface-variant);font-weight:400}.label-link{color:var(--md-primary);text-decoration:none}.label-link.spaced{margin-left:8px}
input,textarea{width:100%;padding:13px 14px;border:1px solid var(--md-outline);border-radius:8px;background:transparent;color:var(--md-on-surface);font-size:14px;transition:border-color .16s,box-shadow .16s}
textarea{min-height:76px;resize:vertical;line-height:1.5}input::placeholder,textarea::placeholder{color:#747e82}
input:hover,textarea:hover{border-color:var(--md-on-surface)}input:focus,textarea:focus{outline:none;border:2px solid var(--md-primary);padding:12px 13px;box-shadow:none}
.upload-area{display:flex;align-items:center;gap:12px}.upload-preview{display:grid;width:52px;height:52px;flex:0 0 52px;place-items:center;overflow:hidden;border-radius:12px;background:var(--md-surface-container)}.upload-preview img{width:100%;height:100%;object-fit:cover}.upload-input-group{min-width:0;flex:1}
.upload-buttons{display:flex;gap:8px;margin-top:8px}.upload-btn,.clear-btn{min-height:36px;flex:1;padding:0 14px;border:0;border-radius:18px;font-size:12px;font-weight:600;cursor:pointer}.upload-btn{color:var(--md-on-primary-container);background:var(--md-primary-container)}.clear-btn{color:var(--md-error);background:var(--md-error-container)}
.upload-status{display:none;margin:6px 4px 0;color:var(--md-primary);font-size:11px}.upload-status.show{display:block}
.submit-btn{width:100%;min-height:48px;margin-top:12px;padding:0 24px;border:0;border-radius:24px;background:var(--md-primary);color:var(--md-on-primary);font-size:15px;font-weight:700;box-shadow:var(--md-shadow);cursor:pointer;transition:box-shadow .2s,filter .2s}.submit-btn:hover{filter:brightness(1.06);box-shadow:0 2px 6px rgba(0,31,40,.24)}.submit-btn:disabled{cursor:wait;opacity:.62}
.card-status{min-height:0;margin-top:6px;padding:0 4px;border-radius:8px;font-size:11px}.card-status.valid,.card-status.invalid,.card-status.checking{padding:7px 10px}.card-status.valid{color:#006c4c;background:#a6f2d6}.card-status.invalid{color:#93000a;background:var(--md-error-container)}.card-status.checking{color:var(--md-on-primary-container);background:var(--md-primary-container)}
.result-card{overflow:hidden;margin-top:20px;border-radius:16px;background:var(--md-secondary-container)}.steps-box{padding:16px;border-bottom:1px solid var(--md-outline-variant)}.steps-title{margin-bottom:8px;color:var(--md-on-primary-container);font-size:13px;font-weight:700}.steps-list p{margin-bottom:4px;color:var(--md-on-surface-variant);font-size:12px}.link-box{margin:14px;padding:12px;border-radius:8px;background:var(--md-surface-lowest);word-break:break-all}.link-box code{color:var(--md-primary);font-size:11px}.btn-row{display:flex;gap:10px;padding:0 14px 14px}.btn-copy,.btn-preview{min-height:40px;flex:1;padding:0 16px;border:0;border-radius:20px;font-size:13px;font-weight:700;text-align:center;text-decoration:none;line-height:40px;cursor:pointer}.btn-copy{background:var(--md-primary);color:var(--md-on-primary)}.btn-preview{background:var(--md-tertiary);color:#fff}.msg.error{margin-top:14px;padding:12px;border-radius:12px;background:var(--md-error-container);color:#93000a;font-size:13px;text-align:center}
.legal-notice{padding:14px 16px;margin-top:16px;border-radius:12px;background:var(--md-surface-container);color:var(--md-on-surface-variant);font-size:11px;line-height:1.55;text-align:center}
.toast{position:fixed;z-index:1100;bottom:86px;left:50%;max-width:calc(100% - 32px);padding:12px 18px;border-radius:6px;background:#2e3132;color:#fff;font-size:13px;opacity:0;pointer-events:none;transform:translate(-50%,20px);transition:opacity .2s,transform .2s}.toast.show{opacity:1;transform:translate(-50%,0)}
.toast{bottom:24px}
@media(min-width:700px){body{padding-top:18px}.app{padding:0 4px}}
@media(max-width:420px){body{padding-right:12px;padding-left:12px}.template-grid{gap:5px}.template-btn{padding:4px;border-radius:9px}.template-btn img{max-width:30px;border-radius:7px}.upload-preview{width:44px;height:44px;flex-basis:44px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition-duration:.01ms!important}}