*,*:before,*:after{box-sizing:border-box}*{margin:0;padding:0}html,body{height:100%}body{line-height:1.5;-webkit-font-smoothing:antialiased}img,picture,video,canvas,svg{display:block;max-width:100%}input,button,textarea,select{font:inherit}button{background:none;border:none;cursor:pointer}ul,ol{list-style:none}a{text-decoration:none;color:inherit}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}.logo img{height:70px;width:auto;display:block}.bg-dark{background-color:var(--bg-primary)}.text-light{color:var(--text-primary)}.flex{display:flex}.flex-wrap{flex-wrap:wrap}.inline-flex{display:inline-flex}.grid{display:grid}.center{align-items:center;justify-content:center}.between{justify-content:space-between}.column,.flex-column{flex-direction:column}.mt-sm{margin-top:.5rem}.mt-md{margin-top:1rem}.mt-lg{margin-top:2rem}.mb-sm{margin-bottom:.5rem}.mb-md{margin-bottom:1rem}.mb-lg{margin-bottom:2rem}.mb-xl{margin-bottom:8rem}.p-sm{padding:.5rem}.p-md{padding:1rem}.p-lg{padding:2rem}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.text-muted{opacity:.7}.text-sm{font-size:.875rem}.text-lg{font-size:1.25rem}.font-bold{font-weight:600}.hidden{display:none}.pointer{cursor:pointer}.rounded{border-radius:.5rem}.shadow-sm{box-shadow:0 4px 12px #0000000d}.gap-sm{gap:.5rem}.gap-md{gap:1rem}.center-y{align-items:center}.flex-center{display:flex;align-items:center;justify-content:center}.hide-sm{display:none}@media (min-width: 768px){.hide-sm{display:flex}}.nav-link{color:var(--muted);text-decoration:none;padding:.4rem .6rem;border-radius:6px;transition:color .15s,background .15s,transform .08s;font-size:.95rem}.nav-link:hover{color:var(--text-primary);background:#ffffff05}:root{--bg-primary: #121212;--bg-surface: #0a0a0a;--text-primary: #e6eef6;--muted: #bcbcbc;--accent: #3d3d5c;--accent-2: #1e1e2e;--glass: rgba(255, 255, 255, .03);--radius: 8px;--max-width: 1100px}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;background:#2b2525;color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.container{max-width:var(--max-width);margin:0 auto;padding:2rem}.header{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.5rem 0 1.25rem}.brand{display:flex;align-items:center;gap:.75rem;font-weight:700;letter-spacing:.2px}.brand .logo{width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:0 6px 18px #0d1e2d80}.nav{display:flex;gap:.6rem;align-items:center}.nav a{color:var(--muted);text-decoration:none;padding:.4rem .6rem;border-radius:6px;transition:color .15s,background .15s,transform .08s;font-size:.95rem}.nav a:hover{color:var(--text-primary);background:#ffffff05}.hero{padding:1rem 0 2rem;display:flex;flex-direction:column;gap:.5rem}.hero-title{font-size:clamp(1.5rem,3.6vw,2.25rem);line-height:1.05;font-weight:800}.hero-sub{color:var(--muted);max-width:64ch;font-size:1rem}.main-grid{display:grid;grid-template-columns:1fr 320px;gap:1.5rem;align-items:start}.content{min-height:60vh;display:flex;flex-direction:column;gap:1rem}.sidebar{display:flex;flex-direction:column;gap:1rem}.sidebar .card{position:sticky;top:1.5rem}.card{background:linear-gradient(180deg,#ffffff05,#ffffff03);border:1px solid rgba(255,255,255,.03);padding:1rem;border-radius:var(--radius);box-shadow:0 8px 24px #02061773}.card h3{margin:0 0 .5rem;font-size:1.05rem;font-weight:700;color:var(--text-primary)}.card p{margin:0;color:var(--muted);font-size:.95rem}.list-linear{display:flex;flex-direction:column;gap:.5rem}.step{display:flex;gap:.75rem;align-items:flex-start;padding:.65rem;border-radius:6px;background:#ffffff03;border-left:3px solid rgba(255,255,255,.03)}.step .num{min-width:28px;height:28px;display:inline-grid;place-items:center;font-weight:700;color:var(--accent);border-radius:6px;background:#7dd3fc0f}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.45rem .7rem;border-radius:6px;border:1px solid rgba(255,255,255,.06);background:transparent;color:var(--accent);cursor:pointer;font-weight:600;text-decoration:none}.btn:hover{transform:translateY(-1px)}.btn.primary{background:var(--text-primary);color:var(--accent-2);border:none}.btn-ghost{display:inline-flex;align-items:center;gap:.5rem;padding:.45rem .7rem;background:var(--glass);color:var(--text-primary);border:1px solid rgba(255,255,255,.08);border-radius:6px;font-weight:600;text-decoration:none;cursor:pointer;transition:background .15s ease,border-color .15s ease,transform .08s ease,color .15s ease}.btn-ghost:hover{background:#ffffff0f;border-color:#ffffff24;transform:translateY(-1px)}.btn-ghost:active{transform:translateY(0);background:#ffffff0a}.btn-ghost.accent{color:var(--accent)}.btn-ghost.muted{color:var(--muted)}.edit-btn,.delete-btn{margin-left:.5rem;padding:.25rem .5rem;border-radius:4px;border:none;cursor:pointer;font-size:.875rem}.edit-btn{background:#4caf5033;color:#4caf50}.edit-btn:hover{background:#4caf504d}.delete-btn{background:#f4433633;color:#f44336}.delete-btn:hover{background:#f443364d}.footer{padding:2rem 0 1rem;color:var(--muted);text-align:center;font-size:.9rem}.link-plain{color:var(--accent);text-decoration:underline}.kv{display:flex;gap:.5rem;align-items:center;color:var(--muted);font-size:.95rem}@media (max-width: 900px){.container{padding:1rem}.main-grid{grid-template-columns:1fr}.sidebar{order:2}.content{order:1}.header{flex-direction:column;align-items:flex-start;gap:.5rem}}@keyframes fadeSlideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.animate-fade-slide{animation:fadeSlideUp .8s ease-out forwards;opacity:0}.hero{padding-top:6rem;padding-bottom:6rem;max-width:720px}.hero-admin{padding-top:2rem;padding-bottom:2rem;max-width:720px}.hero-title{font-size:3rem;font-weight:700;line-height:1.1;letter-spacing:-.02em}.hero-subtitle{margin-top:1rem;font-size:1.125rem;color:var(--text-muted);line-height:1.6}.algorithms-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;padding:2rem}.algo-card{border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:1.5rem;background:#0000000d;transition:all .3s ease}.algo-card:hover{background:#ffffff1a;border-color:#fff3}.algo-card h3{margin:0 0 .5rem;font-size:1.25rem}.algo-image{aspect-ratio:16 / 9;width:100%;border-radius:6px;overflow:hidden;margin-bottom:1rem;background:#0f0f0f}.algo-image img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s ease}.algo-card:hover .algo-image img{transform:scale(1.05)}.difficulty-badge{display:inline-block;padding:.25rem .75rem;border-radius:4px;font-size:.875rem;font-weight:600;margin-bottom:1rem}.difficulty-beginner{background:#4caf5033;color:#4caf50}.difficulty-intermediate{background:#ffc10733;color:#ffc107}.difficulty-advanced{background:#f4433633;color:#f44336}.algo-description{font-size:.95rem;line-height:1.5;color:#fffc}