/* PDF変換ツール - 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-success:#10B981;--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:700px;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:1.05rem;font-weight:600;margin-bottom:6px}
.section-desc{font-size:0.82rem;color:var(--color-text-muted);margin-bottom:16px}

.mode-tabs{display:flex;gap:0;background:var(--color-divider);border-radius:var(--radius-sm);padding:3px;margin-bottom:20px}
.tab-btn{flex:1;padding:10px 12px;border:none;background:transparent;font-family:var(--font-sans);font-size:0.82rem;font-weight:500;color:var(--color-text-secondary);border-radius:6px;cursor:pointer;transition:all var(--transition)}
.tab-btn.active{background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow-sm);font-weight:600}

.tool-section{background:var(--color-surface);border-radius:var(--radius-lg);padding:28px 24px;box-shadow:var(--shadow-md);border:1px solid var(--color-border);margin-bottom:20px}
.tool-section.hidden{display:none}

/* Drop Area */
.drop-area{border:2px dashed var(--color-border);border-radius:var(--radius-md);padding:32px 20px;text-align:center;transition:all var(--transition);position:relative;cursor:pointer}
.drop-area:hover,.drop-area.dragover{border-color:var(--color-primary);background:var(--color-primary-bg)}
.file-input{position:absolute;inset:0;opacity:0;cursor:pointer}
.drop-label{display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none}
.drop-icon{font-size:2rem}
.drop-text{font-size:0.88rem;color:var(--color-text-secondary);line-height:1.5}
.drop-text small{font-size:0.75rem;color:var(--color-text-muted)}

/* File List */
.file-list{margin-top:16px;display:flex;flex-direction:column;gap:6px}
.file-list.hidden{display:none}
.file-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:var(--color-divider);border-radius:var(--radius-sm);font-size:0.85rem}
.file-item .file-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-right:8px}
.file-item .file-size{color:var(--color-text-muted);font-size:0.75rem;flex-shrink:0}
.file-item .file-remove{background:none;border:none;color:var(--color-text-muted);cursor:pointer;font-size:1rem;padding:0 4px;transition:color var(--transition)}
.file-item .file-remove:hover{color:#EF4444}

/* Action Button */
.action-btn{width:100%;padding:14px 24px;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;margin-top:16px}
.action-btn.primary{background:var(--color-primary);color:#fff}
.action-btn.primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.action-btn.hidden{display:none}

/* Progress */
.progress{height:6px;background:var(--color-divider);border-radius:3px;overflow:hidden;margin-top:16px}
.progress.hidden{display:none}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-success));border-radius:3px;width:0;transition:width 0.3s ease}

/* Image Preview */
.image-preview{margin-top:20px;display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.image-preview.hidden{display:none}
.preview-item{background:var(--color-divider);border-radius:var(--radius-sm);overflow:hidden;position:relative}
.preview-item img{width:100%;display:block}
.preview-item .dl-btn{position:absolute;bottom:8px;right:8px;background:var(--color-primary);color:#fff;border:none;border-radius:4px;font-family:var(--font-sans);font-size:0.72rem;padding:4px 10px;cursor:pointer;transition:all var(--transition)}
.preview-item .dl-btn:hover{background:var(--color-primary-dark)}
.preview-item .page-label{position:absolute;top:8px;left:8px;background:rgba(0,0,0,0.6);color:#fff;font-size:0.7rem;padding:2px 8px;border-radius:4px}

/* Notice */
.notice-section{margin-top:20px}
.notice-card{background:var(--color-primary-bg);border:1px solid #C3D8F0;border-radius:var(--radius-md);padding:16px 20px}
.notice-card h3{font-size:0.9rem;font-weight:600;margin-bottom:6px}
.notice-card p{font-size:0.82rem;color:var(--color-text-secondary);line-height:1.7}
.notice-card strong{color:var(--color-primary-dark)}

.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-nav{margin-top:12px;display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap}
.footer-nav a{font-size:0.82rem;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}
  .tool-section{padding:20px 16px}
  .tab-btn{font-size:0.75rem;padding:8px 6px}
  .image-preview{grid-template-columns:1fr}
  .footer-nav{flex-direction:column;gap:6px}.nav-sep{display:none}
}