:root{--primary-color:#1db954;--secondary-color:#005700;--background-color:#0a0a0a;--surface-color:#1c1c1c;--text-color:#a8e6cf;--accent-color:#00b300;--glow-color:rgba(29,185,84,0.8);--overlay-color:rgba(29,185,84,.15)}:root.light-theme{--primary-color:#0573cc;--secondary-color:#1a5c94;--background-color:#f7f7f7;--surface-color:#ffffff;--text-color:#333333;--accent-color:#2196F3;--glow-color:rgba(5,115,204,0.4);--overlay-color:rgba(45,188,255,.466)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Roboto',sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;overflow-x:hidden}.container{max-width:1000px;padding:20px;margin:0 auto}header{text-align:center;padding:80px 0;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));position:relative;overflow:hidden;clip-path:polygon(0 0,100% 0,100% 85%,0 100%)}.binary-background{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(rgba(0,0,0,0.3),rgba(0,0,0,0.3)),url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><text x="50%" y="50%" font-size="70" text-anchor="middle" dy=".35em" font-family="monospace" fill="rgba(255,255,255,0.1)">01</text></svg>');background-size:50px 50px;animation:scrollBinary 20s linear infinite;z-index:0;opacity:0.5}@keyframes scrollBinary{0%{background-position:0 0}100%{background-position:0 100%}}h1{font-family:'Orbitron',sans-serif;font-size:4rem;margin-bottom:10px;position:relative;z-index:1;text-shadow:2px 2px 4px rgba(0,0,0,0.3),0 0 10px var(--glow-color);letter-spacing:2px}.subtitle{font-size:1.4rem;opacity:0.9;position:relative;z-index:1;text-shadow:1px 1px 2px rgba(0,0,0,0.3)}.card{background-color:var(--surface-color);border-radius:15px;padding:40px;margin-bottom:40px;box-shadow:0 15px 30px rgba(0,0,0,0.2),0 0 15px var(--glow-color);position:relative;overflow:hidden;transition:transform 0.3s ease,box-shadow 0.3s ease}.card:hover{transform:translateY(-10px);box-shadow:0 20px 40px rgba(0,0,0,0.3),0 0 20px var(--glow-color)}.card::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,var(--glow-color) 0%,transparent 70%);opacity:0;transition:opacity 0.3s ease}.card:hover::before{opacity:0}h2{font-family:'Orbitron',sans-serif;color:var(--accent-color);margin-bottom:25px;font-size:2.2rem;letter-spacing:1px;text-shadow:0 0 5px var(--glow-color)}p,ul,ol{margin-bottom:25px;font-size:1.1rem}.highlight{color:var(--secondary-color);font-weight:700;text-shadow:0 0 3px var(--secondary-color)}.cipher-demo{background-color:var(--surface-color);padding:40px;border-radius:15px;border:2px solid var(--accent-color);box-shadow:0 0 20px var(--glow-color)}.input-group{margin-bottom:25px}label{display:block;margin-bottom:10px;color:var(--accent-color);font-size:1.1rem;font-weight:700}input,select,button{width:100%;padding:15px;border:none;border-radius:8px;font-size:1.1rem;transition:all 0.3s ease;position:relative;z-index:10;opacity:1;pointer-events:auto}input,select{background-color:rgba(255,255,255,0.1);color:var(--text-color);font-family:'Roboto Mono',monospace;box-shadow:inset 0 0 5px rgba(0,0,0,0.2)}input:focus,select:focus{outline:none;box-shadow:0 0 0 2px var(--accent-color),0 0 10px var(--glow-color)}button{background-color:var(--accent-color);color:var(--background-color);font-weight:700;cursor:pointer;text-transform:uppercase;letter-spacing:2px;margin-top:15px;box-shadow:0 5px 15px rgba(0,0,0,0.2);position:relative;overflow:hidden}button::after{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,0.3) 0%,transparent 70%);opacity:0;transition:opacity 0.3s ease}button:hover{background-color:var(--accent-color);color:var(--text-color)}button:hover::after{opacity:1}.decryption-container{width:100%;margin-top:20px;margin-bottom:20px}#result{background-color:var(--overlay-color);padding:20px;padding-top:40px;border-radius:10px;font-weight:400;line-height:1.6;box-shadow:0 0 20px var(--overlay-color);border:1px solid var(--text-color);position:relative;overflow:hidden;min-height:200px;white-space:pre-wrap;word-break:break-word}#result::before{content:"CIPHER OPERATIONS";position:absolute;top:0;left:0;right:0;background-color:var(--background-color);color:var(--accent-color);padding:5px;font-size:0.8em;font-weight:700;text-align:center;letter-spacing:2px}.encryption-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:repeating-linear-gradient(0deg,var(--overlay-color) 25%,transparent 25%,transparent 50%,var(--overlay-color) 50%,var(--overlay-color) 75%,transparent 75%,transparent 100%);background-size:4px 4px;animation:slide 20s linear infinite;pointer-events:none}@keyframes slide{0%{background-position:0 0}100%{background-position:0 100%}}.blinking-cursor{animation:blink 0.7s infinite;font-weight:700}@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}#satisfaction{margin-top:30px;text-align:center}#satisfaction button{width:auto;margin:0 10px;padding:12px 25px}@media (max-width:768px){.container{padding:15px}.card{padding:30px}h1{font-size:3rem}.subtitle{font-size:1.2rem}h2{font-size:1.8rem}p,ul,ol,input,select,button{font-size:1rem}.resource-list{padding-left:0;}.resource-item{margin-bottom:15px;}.resource-link{display:block;padding:10px;text-align:center;}}@media (max-width:480px){h1{font-size:2.5rem}.subtitle{font-size:1rem}.card{padding:20px}h2{font-size:1.5rem}}.theme-popup{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background-color:var(--surface-color);padding:30px;border-radius:15px;box-shadow:0 0 20px rgba(0,0,0,0.3);z-index:1000;display:none;text-align:center}.theme-popup h3{margin-bottom:20px;font-size:1.4em;color:var(--text-color)}.theme-buttons{display:flex;justify-content:center;gap:15px}.theme-button{display:flex;flex-direction:column;align-items:center;padding:15px;background-color:var(--surface-color);color:var(--text-color);border:2px solid var(--accent-color);border-radius:10px;font-size:1em;cursor:pointer;transition:all 0.3s ease}.theme-button:hover{background-color:var(--accent-color);color:var(--background-color);transform:translateY(-3px);box-shadow:0 4px 8px rgba(0,0,0,0.2)}.theme-button .icon{font-size:1.5em;margin-bottom:5px}.theme-toggle-wrapper{position:fixed;top:20px;right:20px;z-index:1000}.theme-toggle{width:60px;height:30px;background-color:var(--surface-color);border-radius:15px;display:flex;align-items:center;cursor:pointer;transition:all 0.3s ease;box-shadow:0 2px 5px rgba(0,0,0,0.2)}.theme-toggle::after{content:'🌙';width:26px;height:26px;background-color:var(--accent-color);border-radius:50%;display:flex;justify-content:center;align-items:center;font-size:16px;transition:all 0.3s ease}.theme-toggle.light-theme::after{content:'☀️';transform:translateX(30px)}.theme-toggle:hover{box-shadow:0 0 10px var(--glow-color)}.resource-link{position:relative;display:inline-block;padding:5px 10px;margin:5px 0;color:var(--background-color);text-decoration:none;background-color:var(--secondary-color);border-radius:4px;transition:all 0.3s ease;z-index:10}.resource-link:hover{background-color:var(--glow-color);transform:translateY(-2px);box-shadow:0 2px 5px rgba(0,0,0,0.1)}.resource-link::after{content:'→';margin-left:5px;opacity:0;transition:opacity 0.3s ease}.resource-link:hover::after{opacity:1}