:root{--bg:#0a0a0a;--bg-card:#141414;--bg-hover:#1a1a1a;--border:#262626;--text:#e5e5e5;--text-dim:#a3a3a3;--primary:#f97316;--primary-hover:#fb923c;--primary-bg:rgba(249,115,22,.1);--radius:12px;--shadow:0 2px 8px rgba(0,0,0,.3)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary);text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.header{border-bottom:1px solid var(--border);padding:16px 0;background:var(--bg)}
.header .container{display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:700;color:var(--text)}
.nav{display:flex;gap:16px}
.nav-link{color:var(--text-dim);font-size:.9rem;transition:color .2s}
.nav-link:hover{color:var(--primary)}
.main{flex:1;padding:40px 0}
.hero{text-align:center;margin-bottom:48px}
.hero h1{font-size:2.5rem;margin-bottom:12px;background:linear-gradient(135deg,var(--primary),var(--primary-hover));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text-dim);font-size:1.1rem;max-width:600px;margin:0 auto}
.category{margin-bottom:40px}
.category h2{font-size:1.4rem;margin-bottom:4px;color:var(--text)}
.category-desc{color:var(--text-dim);font-size:.9rem;margin-bottom:20px}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:all .2s;display:block;color:var(--text)}
.tool-card:hover{border-color:var(--primary);background:var(--bg-hover);transform:translateY(-2px);box-shadow:var(--shadow)}
.tool-icon{width:44px;height:44px;background:var(--primary-bg);border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:var(--primary)}
.tool-card h3{font-size:1rem;margin-bottom:6px}
.tool-card p{color:var(--text-dim);font-size:.85rem;line-height:1.4}
.tool-header{margin-bottom:24px}
.back-link{color:var(--text-dim);font-size:.9rem;display:inline-block;margin-bottom:12px;transition:color .2s}
.back-link:hover{color:var(--primary)}
.tool-header h1{font-size:1.8rem;margin-bottom:8px}
.tool-header p{color:var(--text-dim)}
.tool-container{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.tool-content{padding:24px;max-width:800px;margin:0 auto}

/* Form elements */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:.85rem;color:var(--text-dim);margin-bottom:6px;font-weight:500}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:.9rem;outline:none;transition:border-color .2s;font-family:inherit}
.form-group textarea{min-height:120px;resize:vertical}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary)}
.form-group select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%23a3a3a3' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}
.form-group select option{background:var(--bg-card);color:var(--text)}

/* Buttons */
.btn{padding:8px 16px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;font-size:.85rem;transition:all .2s;display:inline-flex;align-items:center;gap:6px}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:600}
.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover);color:#fff}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}
.btn-sm{padding:5px 10px;font-size:.8rem}
.btn-lg{padding:12px 28px;font-size:1rem}
.action-bar{display:flex;justify-content:center;padding:20px 0;gap:10px}

/* AI-specific: Input area */
.ai-input{margin-bottom:0}
.ai-input textarea{min-height:140px;line-height:1.6}
.ai-input textarea.code-input{font-family:'SF Mono',Monaco,Consolas,'Liberation Mono',monospace;font-size:.85rem;tab-size:4;min-height:180px}

/* AI-specific: Output area */
.ai-output{margin-top:20px;display:none}
.ai-output.visible{display:block}
.ai-output-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.ai-output-header h3{font-size:1rem;color:var(--text)}
.ai-output-header .btn-copy{padding:4px 10px;font-size:.75rem}

/* AI-specific: Result display */
.ai-result{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;line-height:1.7;font-size:.9rem;white-space:pre-wrap;word-wrap:break-word;max-height:500px;overflow-y:auto}
.ai-result code{background:rgba(249,115,22,.1);padding:2px 6px;border-radius:4px;font-size:.85rem;font-family:'SF Mono',Monaco,Consolas,monospace}
.ai-result pre{background:rgba(0,0,0,.3);border:1px solid var(--border);border-radius:8px;padding:14px;overflow-x:auto;margin:10px 0;font-size:.85rem}
.ai-result pre code{background:none;padding:0}
.ai-result-code{font-family:'SF Mono',Monaco,Consolas,'Liberation Mono',monospace;font-size:.85rem;tab-size:4}

/* AI-specific: Loading state */
.ai-loading{display:none;text-align:center;padding:40px 20px}
.ai-loading.visible{display:block}
.ai-loading .spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 0.8s linear infinite;margin:0 auto 12px}
.ai-loading p{color:var(--text-dim);font-size:.9rem}
@keyframes spin{to{transform:rotate(360deg)}}

/* Option pills */
.option-pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.option-pill{padding:6px 16px;border-radius:20px;border:1px solid var(--border);background:var(--bg);color:var(--text-dim);cursor:pointer;font-size:.85rem;transition:all .2s;user-select:none}
.option-pill:hover{border-color:var(--primary);color:var(--primary)}
.option-pill.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Stat bar (for summarize word count etc) */
.ai-stats{display:flex;gap:16px;margin-bottom:12px;flex-wrap:wrap}
.ai-stat{background:var(--primary-bg);border:1px solid rgba(249,115,22,.2);border-radius:8px;padding:8px 14px;font-size:.85rem;color:var(--primary)}
.ai-stat strong{font-weight:700}

/* Sentiment indicators */
.sentiment-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:20px;font-size:.9rem;font-weight:600;margin-bottom:12px}
.sentiment-badge.positive{background:rgba(34,197,94,.15);color:#22c55e;border:1px solid rgba(34,197,94,.3)}
.sentiment-badge.negative{background:rgba(239,68,68,.15);color:#ef4444;border:1px solid rgba(239,68,68,.3)}
.sentiment-badge.neutral{background:rgba(163,163,163,.15);color:#a3a3a3;border:1px solid rgba(163,163,163,.3)}

/* Input row for side-by-side fields */
.input-row{display:flex;gap:14px}
.input-row .form-group{flex:1}

/* Toast notification */
.toast{position:fixed;bottom:24px;right:24px;background:var(--primary);color:#fff;padding:12px 20px;border-radius:8px;font-weight:600;font-size:.9rem;opacity:0;transform:translateY(12px);transition:all .3s;z-index:100;pointer-events:none}
.toast.show{opacity:1;transform:translateY(0)}

/* Footer */
.footer{border-top:1px solid var(--border);padding:20px 0;text-align:center;color:var(--text-dim);font-size:.85rem}
.footer-info{margin-bottom:12px;line-height:1.8}
.footer-info strong{color:var(--text)}
.footer-info a{color:var(--primary)}
.footer-social{margin-bottom:10px}
.footer-social a{color:var(--text-dim);margin:0 6px;transition:color .2s}
.footer-social a:hover{color:var(--primary)}
.footer-tech{font-size:.75rem;color:#475569;margin-bottom:10px}
.footer-links{margin-top:8px;font-size:.8rem}
.footer-links a{color:var(--text-dim);margin:0 6px}
.footer-links a:hover{color:var(--primary)}

/* Responsive */
@media(max-width:768px){
.hero h1{font-size:1.8rem}
.tools-grid{grid-template-columns:1fr}
.nav{gap:8px}.nav-link{font-size:.8rem}
.header .container{flex-wrap:wrap;gap:10px}
.tool-content{padding:16px}
.input-row{flex-direction:column}
.option-pills{gap:6px}
.option-pill{padding:5px 12px;font-size:.8rem}
.ai-result{max-height:400px;font-size:.85rem}
.ai-stats{gap:8px}
}