:root{--bg:#070b14;--bg2:#0b1220;--panel:rgba(15,23,42,.78);--panel2:rgba(2,6,23,.74);--text:#f8fafc;--muted:#a8b3c7;--line:rgba(148,163,184,.23);--accent:#38bdf8;--accent2:#8b5cf6;--good:#22c55e;--warn:#f59e0b;--bad:#fb7185;--shadow:0 24px 80px rgba(0,0,0,.45);--radius:24px;--font:Inter,ui-sans-serif,system-ui,Segoe UI,Arial,sans-serif;--mono:"JetBrains Mono",Consolas,Monaco,monospace}
[data-theme="light"]{--bg:#eef4fb;--bg2:#dbeafe;--panel:rgba(255,255,255,.86);--panel2:rgba(248,250,252,.94);--text:#0f172a;--muted:#475569;--line:rgba(15,23,42,.14);--shadow:0 24px 80px rgba(15,23,42,.13)}
[data-theme="matrix"]{--bg:#020806;--bg2:#06160c;--accent:#22c55e;--accent2:#84cc16;--panel:rgba(4,18,10,.82);--panel2:rgba(2,10,6,.78)}
[data-theme="ember"]{--bg:#140906;--bg2:#21100a;--accent:#fb923c;--accent2:#ef4444}[data-theme="violet"]{--bg:#0e0820;--bg2:#17102e;--accent:#a78bfa;--accent2:#ec4899}[data-theme="slate"]{--bg:#0f172a;--bg2:#111827;--accent:#94a3b8;--accent2:#38bdf8}[data-theme="cyber"]{--bg:#06111f;--bg2:#0b1f37;--accent:#06b6d4;--accent2:#2563eb}
[data-accent="blue"]{--accent:#3b82f6;--accent2:#06b6d4}[data-accent="lime"]{--accent:#84cc16;--accent2:#22c55e}[data-accent="orange"]{--accent:#fb923c;--accent2:#f59e0b}[data-accent="violet"]{--accent:#8b5cf6;--accent2:#d946ef}[data-accent="rose"]{--accent:#fb7185;--accent2:#f43f5e}[data-accent="gold"]{--accent:#fbbf24;--accent2:#f97316}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 20% 10%,color-mix(in srgb,var(--accent) 25%,transparent),transparent 30%),radial-gradient(circle at 90% 20%,color-mix(in srgb,var(--accent2) 22%,transparent),transparent 28%),linear-gradient(135deg,var(--bg),var(--bg2));color:var(--text);font-family:var(--font);min-height:100vh;overflow-x:hidden}body::before{content:"";position:fixed;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 82%);pointer-events:none;z-index:-3}.matrix-rain{position:fixed;inset:0;width:100%;height:100%;z-index:-2;opacity:0;transition:.4s;pointer-events:none}[data-theme="matrix"] .matrix-rain{opacity:.32}body.reduce *{animation:none!important;transition:none!important}.orb{position:fixed;border-radius:999px;filter:blur(10px);opacity:.58;pointer-events:none;animation:float 12s ease-in-out infinite;z-index:-1}.orb.one{width:320px;height:320px;background:color-mix(in srgb,var(--accent) 22%,transparent);left:-120px;top:120px}.orb.two{width:420px;height:420px;background:color-mix(in srgb,var(--accent2) 18%,transparent);right:-180px;bottom:20px;animation-delay:-5s}@keyframes float{50%{transform:translateY(-28px) translateX(20px) scale(1.05)}}
a{color:inherit;text-decoration:none}.wrap{max-width:1180px;margin:0 auto;padding:24px;position:relative}.nav{position:sticky;top:0;z-index:20;background:rgba(2,6,23,.55);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}[data-theme="light"] .nav{background:rgba(255,255,255,.72)}.navin{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:16px;justify-content:space-between;padding:14px 24px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.04em}.mark{width:38px;height:38px;border-radius:14px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;box-shadow:0 0 30px color-mix(in srgb,var(--accent) 45%,transparent);color:#020617;font-weight:1000}.links{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.links a{font-size:14px;color:var(--muted);padding:9px 11px;border-radius:13px}.links a:hover,.links a.active{color:var(--text);background:rgba(255,255,255,.08)}[data-theme="light"] .links a:hover,[data-theme="light"] .links a.active{background:rgba(15,23,42,.07)}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:26px;align-items:center;padding:54px 0 30px}.premium-hero{min-height:620px}.eyebrow{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--line);background:rgba(255,255,255,.06);border-radius:999px;padding:8px 12px;color:var(--muted);font-size:13px}.h1{font-size:clamp(44px,8vw,92px);line-height:.88;margin:18px 0 14px;letter-spacing:-.08em}.grad{background:linear-gradient(90deg,var(--text),var(--accent),var(--accent2),var(--text));background-size:300% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 7s linear infinite}@keyframes shine{to{background-position:300% 0}}.lead{font-size:clamp(17px,2.3vw,22px);color:var(--muted);max-width:720px;line-height:1.55}.mini-proof{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.mini-proof span{padding:8px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:rgba(255,255,255,.045)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{border:0;border-radius:16px;padding:13px 16px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px;transition:.22s ease;background:rgba(255,255,255,.08);color:var(--text);border:1px solid var(--line)}.btn:hover{transform:translateY(-2px);box-shadow:0 14px 38px rgba(0,0,0,.18)}.btn.primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#020617;border-color:transparent}.btn.danger{background:rgba(251,113,133,.12);color:var(--bad)}.btn.good{background:rgba(34,197,94,.14);color:var(--good)}.btn.small{padding:9px 11px;border-radius:12px;font-size:13px}
.card{position:relative;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;overflow:hidden}.card::after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(120deg,transparent,rgba(255,255,255,.055),transparent);transform:translateX(-120%);transition:.7s;pointer-events:none}.card:hover::after{transform:translateX(120%)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid.two{grid-template-columns:repeat(2,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}.section{padding:28px 0}.section h2{font-size:34px;letter-spacing:-.04em;margin:0 0 12px}.muted{color:var(--muted)}.pill{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:var(--muted);font-size:12px;background:rgba(255,255,255,.05)}.stat{font-size:31px;font-weight:900;letter-spacing:-.04em}
.codepanel{border-radius:22px;background:#090d17;border:1px solid rgba(148,163,184,.2);overflow:hidden;box-shadow:0 20px 70px rgba(0,0,0,.25)}[data-theme="light"] .codepanel{background:#0f172a;color:#e2e8f0}.windowbar{height:40px;display:flex;align-items:center;gap:8px;padding:0 14px;border-bottom:1px solid rgba(148,163,184,.16);color:#94a3b8;font-size:12px}.dot{width:11px;height:11px;border-radius:999px;background:#fb7185}.dot:nth-child(2){background:#fbbf24}.dot:nth-child(3){background:#22c55e}.code{font-family:var(--mono);white-space:pre-wrap;padding:18px;line-height:1.6;color:#e2e8f0;font-size:14px}.hero-terminal{transform:perspective(900px) rotateY(-4deg) rotateX(3deg);animation:terminalFloat 6s ease-in-out infinite}@keyframes terminalFloat{50%{transform:perspective(900px) rotateY(-1deg) rotateX(2deg) translateY(-8px)}}
.editor{width:100%;min-height:250px;resize:vertical;background:#050814;color:#e2e8f0;border:1px solid rgba(148,163,184,.22);border-radius:18px;padding:16px;font-family:var(--mono);line-height:1.55;outline:none}.editor:focus{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent)}.hud{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:14px 0}.meter{height:10px;border-radius:999px;background:rgba(148,163,184,.18);overflow:hidden}.meter span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:.25s}.choice{display:block;width:100%;text-align:left;margin:8px 0;border:1px solid var(--line);background:rgba(255,255,255,.06);color:var(--text);border-radius:14px;padding:13px;cursor:pointer}.choice.correct{border-color:rgba(34,197,94,.7);background:rgba(34,197,94,.14)}.choice.wrong{border-color:rgba(251,113,133,.7);background:rgba(251,113,133,.14)}
.signal-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:16px}.signal-grid div,.preview-card{border:1px solid var(--line);background:rgba(255,255,255,.055);border-radius:18px;padding:14px}.signal-grid span,.preview-card small{display:block;color:var(--muted);margin-top:3px}.split-feature{display:grid;grid-template-columns:1fr 1fr;gap:16px}.graphic-orbit,.graphic-bars{height:150px;position:relative;margin-bottom:10px;border-radius:20px;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 28%,transparent),transparent 60%);border:1px solid var(--line);overflow:hidden}.graphic-orbit span{position:absolute;border:1px solid color-mix(in srgb,var(--accent) 45%,transparent);border-radius:999px;inset:20px;animation:spin 12s linear infinite}.graphic-orbit span:nth-child(2){inset:45px;animation-duration:8s}.graphic-orbit span:nth-child(3){inset:70px;animation-duration:5s}.graphic-bars span{position:absolute;bottom:20px;width:14%;border-radius:16px;background:linear-gradient(var(--accent),var(--accent2));animation:barPulse 2.5s ease-in-out infinite}.graphic-bars span:nth-child(1){left:14%;height:45%}.graphic-bars span:nth-child(2){left:34%;height:70%;animation-delay:.2s}.graphic-bars span:nth-child(3){left:54%;height:36%;animation-delay:.4s}.graphic-bars span:nth-child(4){left:74%;height:62%;animation-delay:.6s}@keyframes spin{to{transform:rotate(360deg)}}@keyframes barPulse{50%{height:82%;filter:brightness(1.2)}}.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.flow span{padding:14px;border-radius:16px;border:1px solid var(--line);text-align:center;background:linear-gradient(135deg,rgba(255,255,255,.06),rgba(255,255,255,.02));font-weight:800}.concepts{display:grid;gap:10px}.concept{border:1px solid var(--line);border-radius:16px;padding:13px;background:rgba(255,255,255,.05)}.concept b{display:block;margin-bottom:4px}.var-list{display:grid;gap:10px}.var-item{display:grid;grid-template-columns:130px 1fr;gap:12px;border:1px solid var(--line);border-radius:16px;padding:13px;background:rgba(255,255,255,.05)}.var-item code{font-family:var(--mono);color:var(--accent);font-weight:800}.friends-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,.95fr);gap:16px}.panel-head{display:flex;justify-content:space-between;gap:12px;align-items:start}.friend-list{display:grid;gap:12px;margin-top:12px}.friend-card{border:1px solid var(--line);border-radius:18px;padding:14px;background:rgba(255,255,255,.045)}.messages{height:420px;overflow:auto;margin:12px 0;padding:14px;border:1px solid var(--line);border-radius:18px;background:rgba(0,0,0,.16)}.msg{display:flex;margin:7px 0}.msg.mine{justify-content:flex-end}.bubble{max-width:80%;border:1px solid var(--line);border-radius:16px;padding:10px 12px;background:rgba(255,255,255,.06)}.msg.mine .bubble{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#020617;border-color:transparent}.chat-input{display:flex;gap:8px}.settings-preview .preview-stack{display:grid;gap:12px;margin-top:16px}.preview-card{display:grid;grid-template-columns:42px 1fr;align-items:center;gap:6px}.preview-card span{width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 0 30px color-mix(in srgb,var(--accent) 45%,transparent)}
.table{width:100%;border-collapse:collapse}.table th,.table td{padding:13px;border-bottom:1px solid var(--line);text-align:left;color:var(--muted)}.table th{color:var(--text);font-size:12px;text-transform:uppercase;letter-spacing:.08em}.footer{border-top:1px solid var(--line);margin-top:40px;padding:22px;color:var(--muted);text-align:center}.toast{position:fixed;right:20px;bottom:20px;z-index:50;padding:14px 16px;border-radius:16px;background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);display:none}.toast.show{display:block;animation:pop .25s ease}@keyframes pop{from{transform:translateY(10px);opacity:0}}.input,select{width:100%;padding:13px 14px;border-radius:15px;border:1px solid var(--line);background:rgba(255,255,255,.07);color:var(--text);outline:none}.input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 16%,transparent)}select option{background:#111827;color:#fff}.mobile-menu{display:none}
@media(max-width:900px){.hero,.grid.two,.split-feature,.friends-layout{grid-template-columns:1fr}.grid,.grid.four{grid-template-columns:1fr 1fr}.hud{grid-template-columns:repeat(2,1fr)}.flow{grid-template-columns:1fr 1fr}.links{display:none}.links.open{display:flex;position:absolute;right:16px;top:64px;left:16px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);flex-direction:column}.mobile-menu{display:inline-flex}.h1{font-size:54px}.premium-hero{min-height:auto}.hero-terminal{transform:none}}
@media(max-width:560px){.wrap,.navin{padding-left:14px;padding-right:14px}.grid,.grid.four{grid-template-columns:1fr}.hud{grid-template-columns:1fr}.actions .btn{width:100%}.h1{font-size:46px}.card{padding:17px}.chat-input{flex-direction:column}.var-item{grid-template-columns:1fr}.flow{grid-template-columns:1fr}.signal-grid{grid-template-columns:1fr}}

/* learning path tabs and profile pictures */
.tabs{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 20px}.tab{border:1px solid var(--line);background:rgba(255,255,255,.06);color:var(--muted);border-radius:999px;padding:10px 14px;font-weight:800;cursor:pointer;transition:.2s}.tab:hover,.tab.active{color:var(--text);border-color:color-mix(in srgb,var(--accent) 55%,var(--line));background:color-mix(in srgb,var(--accent) 14%,transparent);transform:translateY(-1px)}.lesson-path{display:grid;gap:14px}.lesson-row{display:grid;grid-template-columns:64px 1fr auto;gap:16px;align-items:center;padding:18px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(180deg,var(--panel),var(--panel2));box-shadow:var(--shadow);position:relative;overflow:hidden}.lesson-row::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 10%,transparent),transparent 40%);opacity:.7;pointer-events:none}.lesson-index{width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#020617;font-weight:1000;box-shadow:0 0 30px color-mix(in srgb,var(--accent) 35%,transparent)}.lesson-main,.lesson-row .btn{position:relative}.lesson-top{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.path-card h3,.lesson-row h3{margin:10px 0 8px}.no-copy{user-select:none;-webkit-user-select:none}.small-note{font-size:13px}.avatar-preview{width:116px;height:116px;border-radius:32px;padding:6px;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 0 45px color-mix(in srgb,var(--accent) 38%,transparent);margin:14px 0}.avatar-preview img,.avatar-xl{width:100%;height:100%;object-fit:cover;border-radius:26px;display:block;background:#0f172a}.avatar-initials{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#020617;font-weight:1000;letter-spacing:.02em;border:1px solid var(--line);box-shadow:0 10px 28px rgba(0,0,0,.18)}.avatar-initials.big{width:100%;height:100%;border-radius:26px;font-size:34px}.avatar-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin:12px 0 16px}.avatar-choice{border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.06);padding:5px;cursor:pointer;transition:.2s}.avatar-choice:hover,.avatar-choice.active{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 15%,transparent)}.avatar-choice img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:14px;display:block}.avatar-sm{width:48px;height:48px;border-radius:16px;object-fit:cover;background:#0f172a;border:1px solid var(--line);box-shadow:0 10px 28px rgba(0,0,0,.18)}.friend-head{display:flex;align-items:center;gap:12px}.profile-hero{display:flex;gap:18px;align-items:center;margin-bottom:18px}.profile-hero .avatar-xl{width:112px;height:112px;border:4px solid color-mix(in srgb,var(--accent) 70%,transparent);box-shadow:0 0 42px color-mix(in srgb,var(--accent) 26%,transparent)}.profile-hero h2{font-size:40px;margin:8px 0;letter-spacing:-.04em}
@media(max-width:800px){.lesson-row{grid-template-columns:1fr}.lesson-index{width:46px;height:46px}.lesson-row .btn{width:100%}.avatar-grid{grid-template-columns:repeat(3,1fr)}.profile-hero{align-items:flex-start;flex-direction:column}}