:root{--bg:#f8f9fa;--surface:#fff;--surface-alt:#f1f3f5;--text:#212529;--text-dim:#868e96;--border:#dee2e6;--accent:#4263eb;--accent-hover:#3b5bdb;--accent-light:#dbe4ff;--danger:#e03131;--success:#2f9e44;--warning:#f08c00;--radius:8px;--shadow:0 2px 8px rgba(0,0,0,.08);--font:-apple-system,BlinkMacSystemFont,'Segoe UI','Noto Sans JP',sans-serif}
[data-theme="dark"]{--bg:#1a1b1e;--surface:#25262b;--surface-alt:#2c2e33;--text:#c1c2c5;--text-dim:#909296;--border:#373a40;--accent:#748ffc;--accent-hover:#5c7cfa;--accent-light:#364fc7;--shadow:0 2px 8px rgba(0,0,0,.3)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh}
.skip-to-content{position:absolute;top:-100%;left:0;background:var(--accent);color:#fff;padding:8px 16px;z-index:10000;font-size:.9rem;border-radius:0 0 4px 0;transition:top .2s}.skip-to-content:focus{top:0}
.header{background:var(--surface);border-bottom:1px solid var(--border);padding:12px 0;position:sticky;top:0;z-index:100}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center;gap:8px;font-size:1.2rem;font-weight:700;text-decoration:none;color:var(--text)}
.logo-icon{width:32px;height:32px;background:var(--accent);color:#fff;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem}
.accent{color:var(--accent)}
.header-right{display:flex;align-items:center;gap:12px}
.usage-badge{font-size:.8rem;background:var(--accent-light);color:var(--accent);padding:4px 12px;border-radius:20px}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:50%;width:36px;height:36px;cursor:pointer;font-size:1.1rem;color:var(--text);transition:.2s}
.theme-toggle:hover{border-color:var(--accent)}
.main-tool{max-width:1200px;margin:0 auto;padding:20px}
.tool-section{margin-bottom:24px}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.panel-header{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--surface-alt)}
.panel-header h2,.panel-header h3{font-size:.95rem;font-weight:600}
.panel-actions{display:flex;gap:6px}
textarea#input-text{width:100%;min-height:320px;padding:16px;border:none;background:transparent;color:var(--text);font-family:var(--font);font-size:.95rem;line-height:1.8;resize:vertical;outline:none}
.input-stats{display:flex;justify-content:space-between;padding:8px 16px;font-size:.8rem;color:var(--text-dim);border-top:1px solid var(--border)}
.tab-bar{display:flex;gap:4px}
.tab{padding:6px 14px;border:none;background:transparent;color:var(--text-dim);cursor:pointer;font-size:.85rem;border-radius:4px;transition:.15s}
.tab:hover{background:var(--surface-alt);color:var(--text)}
.tab.active{background:var(--accent);color:#fff}
.style-selector{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:1px solid var(--border)}
.style-label{font-size:.85rem;color:var(--text-dim);white-space:nowrap}
.style-btn{padding:5px 14px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:16px;cursor:pointer;font-size:.8rem;transition:.15s}
.style-btn:hover{border-color:var(--accent);color:var(--accent)}
.style-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.output-area{padding:16px;min-height:260px;font-size:.95rem;line-height:1.8;white-space:pre-wrap;word-wrap:break-word}
.diff-toggle{padding:8px 16px;font-size:.8rem;border-top:1px solid var(--border)}
.diff-toggle label{display:flex;align-items:center;gap:6px;cursor:pointer;color:var(--text-dim)}
.tab-content{display:none}.tab-content.active{display:block}
.action-bar{display:flex;gap:10px;margin-top:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{padding:10px 28px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);cursor:pointer;font-size:.95rem;font-weight:600;transition:.2s}
.btn-primary:hover{background:var(--accent-hover)}
.btn-secondary{padding:10px 20px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;font-size:.9rem;transition:.2s}
.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}
.btn-sm{padding:4px 12px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:4px;cursor:pointer;font-size:.8rem;transition:.15s}
.btn-sm:hover{border-color:var(--accent);color:var(--accent)}
.btn-copy{font-weight:600}
.history-section{margin-bottom:24px}
.history-list{padding:12px 16px;max-height:300px;overflow-y:auto}
.history-item{display:flex;justify-content:space-between;align-items:start;padding:10px;border-bottom:1px solid var(--border);gap:12px}
.history-item:last-child{border-bottom:none}
.history-meta{font-size:.75rem;color:var(--text-dim);white-space:nowrap}
.history-text{font-size:.85rem;flex:1;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.history-actions{display:flex;gap:4px}
.empty-msg{color:var(--text-dim);font-size:.85rem;text-align:center;padding:20px}
.hidden{display:none!important}
.ad-space{text-align:center;padding:8px;min-height:10px}
.lp-section{padding:48px 0}
.section-title{text-align:center;font-size:1.4rem;margin-bottom:32px;font-weight:700}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow)}
.feature-icon{width:48px;height:48px;background:var(--accent-light);color:var(--accent);border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-weight:800;font-size:1.2rem}
.feature-card h3{font-size:1rem;margin-bottom:8px}
.feature-card p{font-size:.85rem;color:var(--text-dim);line-height:1.6}
.steps{display:flex;gap:24px;justify-content:center}
.step{text-align:center;flex:1;max-width:260px}
.step-num{width:40px;height:40px;background:var(--accent);color:#fff;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}
.step h3{font-size:.95rem;margin-bottom:6px}
.step p{font-size:.85rem;color:var(--text-dim)}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.faq-item summary{padding:14px 20px;cursor:pointer;font-weight:600;font-size:.95rem;list-style:none}
.faq-item summary::before{content:"+";margin-right:8px;font-weight:700;color:var(--accent)}
.faq-item[open] summary::before{content:"-"}
.faq-item p{padding:0 20px 14px;font-size:.9rem;color:var(--text-dim);line-height:1.7}
.footer{background:var(--surface);border-top:1px solid var(--border);padding:20px 0;margin-top:40px}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 20px;text-align:center}
.footer-links{display:flex;gap:16px;justify-content:center;margin-bottom:8px}
.footer-links a{color:var(--text-dim);text-decoration:none;font-size:.85rem}.footer-links a:hover{color:var(--accent)}
.copyright{font-size:.8rem;color:var(--text-dim)}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;padding:10px 24px;border-radius:var(--radius);font-size:.85rem;z-index:9998;box-shadow:0 4px 12px rgba(0,0,0,.2);transition:opacity .3s}
.fab{position:fixed;bottom:20px;right:20px;width:48px;height:48px;background:var(--accent);color:#fff;border:none;border-radius:50%;font-size:1.2rem;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.2);z-index:9000;transition:.2s}.fab:hover{transform:scale(1.1)}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:9999}
.modal{background:var(--surface);border-radius:var(--radius);padding:24px;width:90%;max-width:400px;box-shadow:0 8px 32px rgba(0,0,0,.2)}
.modal h3{margin-bottom:12px;font-size:1.1rem}
.modal select,.modal textarea{width:100%;padding:8px;border:1px solid var(--border);border-radius:4px;background:var(--surface);color:var(--text);font-family:var(--font);margin-bottom:10px}
.modal-actions{display:flex;gap:8px;justify-content:flex-end}
.cookie-banner{position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--border);padding:14px 20px;display:flex;justify-content:space-between;align-items:center;z-index:9998}
.cookie-banner p{font-size:.8rem;color:var(--text-dim)}
mark.diff-add{background:#d3f9d8;color:#2b8a3e;padding:0 2px;border-radius:2px}
mark.diff-del{background:#ffe3e3;color:#c92a2a;text-decoration:line-through;padding:0 2px;border-radius:2px}
[data-theme="dark"] mark.diff-add{background:#2b8a3e;color:#d3f9d8}
[data-theme="dark"] mark.diff-del{background:#c92a2a;color:#ffe3e3}
.issue-item{padding:8px 12px;border-left:3px solid var(--warning);margin-bottom:8px;background:var(--surface-alt);border-radius:0 4px 4px 0;font-size:.88rem}
.issue-item.error{border-left-color:var(--danger)}
.issue-item .issue-type{font-weight:600;color:var(--accent);margin-right:8px;font-size:.8rem}
.issue-item .suggestion{color:var(--success);font-size:.82rem;display:block;margin-top:4px}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:16px}
.stat-card{background:var(--surface-alt);border-radius:var(--radius);padding:14px;text-align:center}
.stat-value{font-size:1.4rem;font-weight:700;color:var(--accent)}
.stat-label{font-size:.8rem;color:var(--text-dim)}
.score-bar{height:8px;background:var(--surface-alt);border-radius:4px;overflow:hidden;margin-top:8px}
.score-fill{height:100%;border-radius:4px;transition:width .4s}
@media(max-width:768px){.tool-grid{grid-template-columns:1fr}.feature-grid{grid-template-columns:repeat(2,1fr)}.steps{flex-direction:column;align-items:center}.stat-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.feature-grid{grid-template-columns:1fr}.action-bar{flex-direction:column}.btn-primary,.btn-secondary{width:100%}}