:root{--bg:#0a0a0f;--bg-card:rgba(18,18,30,0.85);--bg-surface:#12121e;--text:#e8e8f0;--text-muted:#888;--accent:#00d2ff;--accent2:#7b68ee;--gradient:linear-gradient(135deg,#00d2ff,#7b68ee);--border:rgba(255,255,255,0.08);--radius:12px;--font:'Inter',sans-serif;--mono:'JetBrains Mono',monospace;--match:#fbbf24;--match-bg:rgba(251,191,36,0.2)}
[data-theme="light"]{--bg:#f5f5fa;--bg-card:rgba(255,255,255,0.9);--bg-surface:#fff;--text:#1a1a2e;--text-muted:#666;--border:rgba(0,0,0,0.08);--match-bg:rgba(251,191,36,0.3)}
*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh}
.bg-glow{position:fixed;inset:0;z-index:-1;overflow:hidden}.bg-glow::before{content:'';position:absolute;width:600px;height:600px;background:var(--accent);border-radius:50%;filter:blur(120px);opacity:0.08;top:-200px;right:-200px;animation:drift 25s infinite alternate}
@keyframes drift{to{transform:translate(-100px,100px)}}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.navbar{position:sticky;top:0;z-index:100;background:rgba(10,10,15,0.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:.75rem 0}
[data-theme="light"] .navbar{background:rgba(245,245,250,0.9)}.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{text-decoration:none;color:var(--text);font-weight:700;font-size:1.2rem;display:flex;align-items:center;gap:.5rem}.brand span{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;gap:.5rem;align-items:center}.nav-links a{text-decoration:none;color:var(--text-muted);font-size:.9rem;padding:.4rem .75rem;border-radius:8px;transition:all .2s}.nav-links a:hover,.nav-links a.active{color:var(--text);background:rgba(0,210,255,0.1)}
.kofi-link{color:#ff5e5b!important;font-weight:600}.theme-btn{background:none;border:1px solid var(--border);width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:1.1rem;display:flex;align-items:center;justify-content:center;transition:all .2s}.theme-btn:hover{border-color:var(--accent)}
.hero{text-align:center;padding:2.5rem 0 1rem}.hero h1{font-size:clamp(1.8rem,4vw,2.5rem);font-weight:800;margin-bottom:.5rem}.gradient-text{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-sub{color:var(--text-muted);max-width:550px;margin:0 auto}
.glass-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:1rem;backdrop-filter:blur(10px)}
.editor-layout{display:grid;grid-template-columns:1fr 350px;gap:1rem;margin-bottom:2rem}
.input-label{display:block;font-size:.8rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.5rem}
.regex-input-wrap{display:flex;align-items:center;background:var(--bg-surface);border:2px solid var(--border);border-radius:8px;padding:.5rem;transition:border-color .2s}.regex-input-wrap:focus-within{border-color:var(--accent)}
.regex-delim{color:var(--accent);font-family:var(--mono);font-size:1.3rem;font-weight:700;padding:0 .25rem}.regex-input{flex:1;background:transparent;border:none;color:var(--text);font-family:var(--mono);font-size:1.1rem;outline:none;padding:.25rem}.flags-input{width:50px;background:transparent;border:none;border-left:1px solid var(--border);color:var(--accent);font-family:var(--mono);font-size:1rem;text-align:center;outline:none;padding-left:.5rem}
.regex-meta{display:flex;justify-content:space-between;margin-top:.5rem;font-size:.8rem;color:var(--text-muted)}.match-count{color:var(--match)}.exec-time{font-family:var(--mono)}
.test-textarea{width:100%;background:var(--bg-surface);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--mono);font-size:.95rem;line-height:1.8;padding:1rem;outline:none;resize:vertical;transition:border-color .2s}.test-textarea:focus{border-color:var(--accent)}
.highlighted-text{font-family:var(--mono);font-size:.95rem;line-height:1.8;padding:1rem;background:var(--bg-surface);border-radius:8px;min-height:100px;white-space:pre-wrap;word-break:break-all;border:1px solid var(--border)}
.highlighted-text mark{background:var(--match-bg);color:var(--match);border-radius:2px;padding:1px 2px;border-bottom:2px solid var(--match)}
.explanation-card h3,.matches-card h3,.replace-card h3{font-size:.95rem;margin-bottom:.75rem}
.explanation-content{font-size:.85rem;line-height:1.7;color:var(--text-muted)}.explanation-content .token{display:inline-block;padding:2px 6px;background:rgba(0,210,255,0.1);border-radius:4px;margin:2px;font-family:var(--mono);color:var(--accent);font-size:.85rem}
.match-groups{font-family:var(--mono);font-size:.85rem;max-height:300px;overflow-y:auto}.match-group-item{padding:.5rem;border-bottom:1px solid var(--border)}.mg-index{color:var(--accent);font-weight:600}.mg-full{color:var(--match)}.mg-group{color:var(--text-muted);font-size:.8rem;margin-left:1rem}
.replace-input{width:100%;padding:.6rem;background:var(--bg-surface);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:var(--mono);font-size:.9rem;outline:none;margin-bottom:.5rem}.replace-input:focus{border-color:var(--accent)}
.replace-result{font-family:var(--mono);font-size:.85rem;padding:.75rem;background:var(--bg-surface);border-radius:6px;min-height:60px;white-space:pre-wrap;word-break:break-all;color:var(--text-muted);border:1px solid var(--border)}
.cheatsheet-section,.patterns-section{margin:2rem 0}.cheatsheet-section h2,.patterns-section h2{font-size:1.5rem;text-align:center;margin-bottom:1.5rem}
.cheat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.cheat-category{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}.cheat-category h4{font-size:.85rem;color:var(--accent);margin-bottom:.75rem;text-transform:uppercase;letter-spacing:.05em}
.cheat-item{display:flex;gap:.75rem;padding:.35rem 0;font-size:.85rem;border-bottom:1px solid rgba(255,255,255,0.03)}.cheat-item code{font-family:var(--mono);color:var(--match);min-width:60px;font-weight:600}.cheat-item span{color:var(--text-muted)}
.patterns-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}
.pattern-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;cursor:pointer;transition:all .3s}.pattern-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.pattern-card h4{font-size:.95rem;margin-bottom:.3rem}.pattern-card .pattern-regex{font-family:var(--mono);font-size:.8rem;color:var(--accent);background:var(--bg-surface);padding:.3rem .6rem;border-radius:4px;display:inline-block;margin:.3rem 0;word-break:break-all}.pattern-card p{font-size:.8rem;color:var(--text-muted)}
.footer{margin-top:3rem;border-top:1px solid var(--border);padding:2rem 0}.footer-inner{display:flex;flex-wrap:wrap;gap:2rem;justify-content:space-between}.footer-brand span{font-weight:700;font-size:1.1rem}.footer-brand p{color:var(--text-muted);font-size:.85rem;margin-top:.3rem}.footer-brand a{color:var(--accent);text-decoration:none}
.footer-links-grid{display:flex;gap:3rem}.footer-links-grid h4{font-size:.85rem;margin-bottom:.75rem}.footer-links-grid a{display:block;color:var(--text-muted);text-decoration:none;font-size:.85rem;margin-bottom:.4rem;transition:color .2s}.footer-links-grid a:hover{color:var(--accent)}
.copyright{width:100%;text-align:center;color:var(--text-muted);font-size:.8rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border)}
@media(max-width:900px){.editor-layout{grid-template-columns:1fr}}
@media(max-width:768px){.nav-links{display:none}}