:root{--color-bg:#020618;--color-surface:#050b24;--color-surface-soft:#070f2e;--color-surface-glass:rgba(15,23,42,0.72);--color-text:#e5f0ff;--color-text-soft:#a5b4fc;--color-primary:#38bdf8;--color-primary-soft:rgba(56,189,248,0.15);--color-accent-orange:#fb923c;--color-accent-lime:#a3e635;--color-accent-purple:#a855f7;--color-success:#22c55e;--color-warning:#facc15;--color-danger:#f97373;--color-border:#1f2937;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--font-sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","Rubik","Segoe UI",system-ui,sans-serif;--font-display:"Russo One","Rajdhani","Orbitron","Montserrat",system-ui,sans-serif;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--font-size-5xl:3rem;--font-size-6xl:3.75rem;--line-tight:1.1;--line-snug:1.25;--line-normal:1.5;--line-relaxed:1.7;--space-0:0;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--space-16:64px;--space-20:80px;--space-24:96px;--radius-xs:4px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-pill:999px;--shadow-xs:0 8px 18px rgba(15,23,42,0.45);--shadow-sm:0 14px 35px rgba(15,23,42,0.55);--shadow-md:0 20px 55px rgba(15,23,42,0.7);--shadow-glass:0 18px 65px rgba(15,23,42,0.9);--shadow-soft:0 0 0 1px rgba(148,163,184,0.15);--transition-fast:120ms ease-out;--transition-normal:200ms ease-out;--transition-slow:320ms ease;--blur-glass:18px}*,*::before,*::after{box-sizing:border-box}*{margin:0;padding:0}html,body{height:100%}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--font-size-base);line-height:var(--line-normal);background:radial-gradient(circle at top,#0f172a 0,#020617 52%,#000 100%);color:var(--color-text);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}img,picture,video,canvas,svg{display:block;max-width:100%;height:auto}input,button,textarea,select{font:inherit;color:inherit}button{border:none;background:none;padding:0;cursor:pointer}a{text-decoration:none;color:inherit}ul,ol{list-style:none}p{margin-bottom:var(--space-4);color:var(--color-text-soft)}p+p{margin-top:var(--space-2)}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;letter-spacing:0.03em;color:var(--gray-50)}h1{font-size:var(--font-size-5xl);line-height:var(--line-tight);margin-bottom:var(--space-4)}h2{font-size:var(--font-size-3xl);line-height:var(--line-tight);margin-bottom:var(--space-3)}h3{font-size:var(--font-size-2xl);line-height:var(--line-snug);margin-bottom:var(--space-3)}h4{font-size:var(--font-size-xl);line-height:var(--line-snug);margin-bottom:var(--space-2)}h5{font-size:var(--font-size-lg);line-height:var(--line-snug);margin-bottom:var(--space-2)}h6{font-size:var(--font-size-base);line-height:var(--line-snug);margin-bottom:var(--space-1);text-transform:uppercase;color:var(--color-text-soft)}a:hover{color:var(--color-primary)}strong,b{font-weight:600;color:var(--gray-50)}code,kbd,pre,samp{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:0.95em}.container{width:100%;margin-left:auto;margin-right:auto;padding-left:var(--space-4);padding-right:var(--space-4);max-width:1120px}@media (min-width:1280px){.container{max-width:1200px}}@media (min-width:1440px){.container{max-width:1320px}}.container-wide{width:100%;margin-left:auto;margin-right:auto;padding-left:var(--space-4);padding-right:var(--space-4);max-width:1440px}.flex{display:flex}.inline-flex{display:inline-flex}.flex-center{display:flex;align-items:center;justify-content:center}.flex-between{display:flex;align-items:center;justify-content:space-between}.flex-col{display:flex;flex-direction:column}.grid{display:grid}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-8)}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-8)}.grid-auto-fit{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:var(--space-6)}@media (max-width:768px){.grid-2,.grid-3{grid-template-columns:1fr}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:0.5rem;padding:0.7rem 1.6rem;border-radius:var(--radius-pill);font-family:var(--font-display);font-size:var(--font-size-sm);letter-spacing:0.12em;text-transform:uppercase;line-height:1;border:1px solid transparent;position:relative;overflow:hidden;color:#0b1120;background:linear-gradient(135deg,var(--color-primary),var(--color-accent-purple));box-shadow:0 0 0 1px rgba(15,23,42,0.9),0 18px 55px rgba(56,189,248,0.45);transition:transform var(--transition-fast),box-shadow var(--transition-fast),background var(--transition-normal),border-color var(--transition-fast),color var(--transition-fast)}.btn::before{content:"";position:absolute;inset:0;opacity:0;background:radial-gradient(circle at 0 0,rgba(248,250,252,0.4),transparent 55%);mix-blend-mode:screen;transition:opacity var(--transition-normal),transform var(--transition-normal);transform:translate3d(-12%,0,0)}.btn:hover{transform:translateY(-1px) scale(1.01);box-shadow:0 0 0 1px rgba(56,189,248,0.8),0 26px 70px rgba(56,189,248,0.55)}.btn:hover::before{opacity:1;transform:translate3d(0,0,0)}.btn:active{transform:translateY(0) scale(0.99);box-shadow:0 0 0 1px rgba(15,23,42,1),0 14px 36px rgba(15,23,42,0.9)}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-accent-lime));color:#020617!important}.btn-ghost{background:rgba(15,23,42,0.7);border-color:rgba(148,163,184,0.4);color:var(--color-text);box-shadow:var(--shadow-xs)}.btn-ghost:hover{background:rgba(15,23,42,0.95);border-color:rgba(248,250,252,0.6)}.btn-chip{padding:0.45rem 1.2rem;border-radius:var(--radius-pill);font-size:var(--font-size-xs);background:rgba(15,23,42,0.7);border:1px solid rgba(148,163,184,0.5);color:var(--color-text-soft);box-shadow:var(--shadow-soft)}.btn:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:0.6;box-shadow:none;transform:none}.input{width:100%;padding:0.7rem 0.9rem;border-radius:var(--radius-md);border:1px solid rgba(148,163,184,0.5);background:rgba(15,23,42,0.86);color:var(--color-text);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast),background var(--transition-fast)}.input::placeholder{color:rgba(148,163,184,0.85)}.input:focus{border-color:var(--color-primary);box-shadow:0 0 0 1px rgba(56,189,248,0.35),0 0 0 6px rgba(56,189,248,0.18);background:rgba(15,23,42,0.98)}.input-error{border-color:var(--color-danger)}.input-success{border-color:var(--color-success)}textarea.input{min-height:140px;resize:vertical}.card{position:relative;border-radius:var(--radius-xl);background:radial-gradient(circle at 0 0,rgba(56,189,248,0.12),transparent 55%),radial-gradient(circle at 100% 0,rgba(168,85,247,0.1),transparent 55%),linear-gradient(145deg,rgba(15,23,42,0.96),rgba(2,6,23,0.98));border:1px solid rgba(148,163,184,0.35);box-shadow:var(--shadow-md);padding:var(--space-6);backdrop-filter:blur(16px)}.card-soft{border-radius:var(--radius-lg);background:rgba(15,23,42,0.94);border:1px solid rgba(148,163,184,0.25);box-shadow:var(--shadow-xs);padding:var(--space-5)}.card-hero{border-radius:34px;background:radial-gradient(circle at 0 0,rgba(59,130,246,0.38),transparent 55%),radial-gradient(circle at 100% 0,rgba(236,72,153,0.45),transparent 55%),radial-gradient(circle at 50% 110%,rgba(56,189,248,0.2),transparent 60%),linear-gradient(150deg,#020617,#020617 38%,#020617 60%);border:1px solid rgba(248,250,252,0.09);box-shadow:0 30px 120px rgba(15,23,42,0.95);padding:var(--space-8)}.glass{background:var(--color-surface-glass);backdrop-filter:blur(var(--blur-glass));border-radius:var(--radius-lg);border:1px solid rgba(148,163,184,0.4);box-shadow:var(--shadow-glass)}.tag{display:inline-flex;align-items:center;gap:0.35rem;padding:0.2rem 0.75rem;border-radius:999px;border:1px solid rgba(148,163,184,0.6);background:rgba(15,23,42,0.82);color:var(--color-text-soft);font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.11em}.tag-pill-primary{border-color:rgba(56,189,248,0.85);background:rgba(15,23,42,0.98);color:var(--color-primary)}.tag-pill-success{border-color:rgba(34,197,94,0.75);color:var(--color-success)}.badge-dot{position:relative;padding-left:0.9rem}.badge-dot::before{content:"";position:absolute;left:0.2rem;top:50%;width:0.4rem;height:0.4rem;border-radius:999px;background:radial-gradient(circle,var(--color-accent-lime),var(--color-primary));transform:translateY(-50%);box-shadow:0 0 0 6px rgba(34,197,94,0.15)}:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}button:focus{outline:none}button:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px;border-radius:inherit}a:focus{outline:none}a:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px;border-radius:4px}@media (prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:0.001ms!important;animation-iteration-count:1!important;transition-duration:0.001ms!important;scroll-snap-type:none!important}html{scroll-behavior:auto}}.link{position:relative;display:inline-flex;align-items:center;gap:0.35rem;font-size:var(--font-size-sm);font-weight:500;color:var(--color-primary);text-decoration:none}.link::after{content:"";position:absolute;left:0;bottom:-0.16rem;width:100%;height:2px;border-radius:999px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent-purple));transform-origin:left;transform:scaleX(0);transition:transform var(--transition-normal)}.link:hover::after{transform:scaleX(1)}.link-ghost{color:var(--color-text-soft)}.link-ghost::after{background:linear-gradient(90deg,var(--gray-400),var(--color-primary))}.chip-nav{display:inline-flex;align-items:center;gap:0.45rem;padding:0.4rem 0.9rem;border-radius:999px;background:rgba(15,23,42,0.8);border:1px solid rgba(148,163,184,0.4);font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.14em;color:var(--color-text-soft)}.chip-nav-active{border-color:rgba(56,189,248,0.9);background:radial-gradient(circle at 0 0,rgba(56,189,248,0.22),transparent 55%),rgba(15,23,42,0.96);color:var(--gray-50)}.pill-gradient{border-radius:999px;background:linear-gradient(135deg,rgba(56,189,248,0.18),rgba(168,85,247,0.18));padding:1px}.pill-gradient-inner{border-radius:inherit;background:radial-gradient(circle at 0 0,rgba(15,23,42,0.96),rgba(15,23,42,0.98));padding:0.25rem 0.85rem}.section{padding-top:var(--space-10);padding-bottom:var(--space-10)}.section-lg{padding-top:var(--space-16);padding-bottom:var(--space-16)}.section-sm{padding-top:var(--space-6);padding-bottom:var(--space-6)}.section-header{display:flex;flex-direction:column;gap:0.5rem;margin-bottom:var(--space-6);}.section-kicker{font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.16em;color:var(--color-accent-lime)}.section-eyebrow{font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.18em;color:var(--color-text-soft)}.section-title{font-family:var(--font-display);font-size:var(--font-size-3xl);line-height:var(--line-tight);color:var(--gray-50)}.section-lead{font-size:var(--font-size-lg);line-height:var(--line-relaxed);color:var(--color-text-soft)}@media (min-width:1024px){.section-title{font-size:var(--font-size-4xl)}}.badge-gradient{display:inline-flex;align-items:center;gap:0.35rem;padding:0.16rem 0.7rem;border-radius:999px;background:radial-gradient(circle at 0 0,rgba(56,189,248,0.3),transparent 60%),radial-gradient(circle at 100% 0,rgba(168,85,247,0.3),transparent 60%),rgba(15,23,42,0.95);border:1px solid rgba(148,163,184,0.45);font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.16em;color:var(--color-text-soft)}.badge-gradient-dot{width:0.46rem;height:0.46rem;border-radius:999px;background:radial-gradient(circle,var(--color-accent-orange),var(--color-primary));box-shadow:0 0 0 4px rgba(248,250,252,0.12)}.pill-stat{display:inline-flex;align-items:center;gap:0.6rem;padding:0.35rem 0.85rem;border-radius:999px;background:rgba(15,23,42,0.94);border:1px solid rgba(148,163,184,0.55);box-shadow:var(--shadow-soft);font-size:var(--font-size-xs);color:var(--color-text-soft)}.pill-stat-value{font-family:var(--font-display);font-size:0.82rem;color:var(--gray-50)}.pill-stat-label{text-transform:uppercase;letter-spacing:0.16em}.list-check{display:grid;gap:0.4rem;margin-top:var(--space-3)}.list-check-item{display:flex;align-items:flex-start;gap:0.6rem;font-size:var(--font-size-sm);color:var(--color-text-soft)}.list-check-bullet{margin-top:0.15rem;width:0.9rem;height:0.9rem;border-radius:999px;background:radial-gradient(circle,var(--color-accent-lime),var(--color-primary));box-shadow:0 0 0 6px rgba(34,197,94,0.15)}.list-divider{display:flex;flex-direction:column;gap:var(--space-3)}.list-divider-item{padding-bottom:var(--space-3);border-bottom:1px dashed rgba(148,163,184,0.4)}.list-divider-item:last-child{border-bottom:none;padding-bottom:0}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:var(--space-4)}.stat{padding:var(--space-4);border-radius:var(--radius-lg);background:rgba(15,23,42,0.9);border:1px solid rgba(148,163,184,0.35);box-shadow:var(--shadow-soft)}.stat-label{font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.16em;color:var(--color-text-soft);margin-bottom:0.4rem}.stat-value{font-family:var(--font-display);font-size:var(--font-size-2xl);line-height:var(--line-tight);color:var(--gray-50)}.stat-meta{font-size:var(--font-size-xs);color:var(--color-text-soft);margin-top:0.3rem}.pill-difficulty{display:inline-flex;align-items:center;gap:0.35rem;padding:0.2rem 0.7rem;border-radius:999px;font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.16em}.pill-difficulty-easy{background:rgba(22,163,74,0.18);color:#bbf7d0;border:1px solid rgba(22,163,74,0.7)}.pill-difficulty-medium{background:rgba(234,179,8,0.18);color:#fef9c3;border:1px solid rgba(234,179,8,0.7)}.pill-difficulty-hard{background:rgba(239,68,68,0.18);color:#fee2e2;border:1px solid rgba(239,68,68,0.7)}.hero-title{font-family:var(--font-display);font-size:2.4rem;line-height:1.05;letter-spacing:0.06em;text-transform:uppercase;color:#f9fafb}.hero-subtitle{font-size:var(--font-size-lg);line-height:var(--line-relaxed);color:var(--color-text-soft);max-width:36rem;margin-top:var(--space-3)}@media (min-width:768px){.hero-title{font-size:3.4rem}.hero-subtitle{font-size:1.15rem}}@media (min-width:1024px){.hero-title{font-size:3.9rem}}.hero-orbit{position:relative}.hero-orbit::before{content:"";position:absolute;inset:-30%;border-radius:999px;border:1px dashed rgba(56,189,248,0.25);opacity:0.8;filter:drop-shadow(0 0 25px rgba(56,189,248,0.25))}.hero-orbit::after{content:"";position:absolute;inset:-10%;border-radius:999px;border:1px dashed rgba(168,85,247,0.4);opacity:0.6;filter:drop-shadow(0 0 32px rgba(168,85,247,0.4));transform:rotate(3deg)}.tile-rail{position:relative;overflow:hidden;border-radius:var(--radius-xl);background:linear-gradient(160deg,rgba(15,23,42,0.98),rgba(2,6,23,1));border:1px solid rgba(148,163,184,0.4)}.tile-rail::before,.tile-rail::after{content:"";position:absolute;inset:0;opacity:0.75}.tile-rail::before{background:repeating-linear-gradient(135deg,rgba(15,23,42,0.3) 0,rgba(15,23,42,0.3) 7px,rgba(56,189,248,0.09) 7px,rgba(56,189,248,0.09) 14px);mix-blend-mode:soft-light}.tile-rail::after{background:radial-gradient(circle at 10% 0,rgba(56,189,248,0.25),transparent 55%),radial-gradient(circle at 80% 0,rgba(168,85,247,0.3),transparent 55%);mix-blend-mode:screen;pointer-events:none}.pill-track{position:relative;display:inline-flex;align-items:center;gap:0.5rem;padding:0.2rem 0.8rem;border-radius:999px;background:rgba(15,23,42,0.92);border:1px solid rgba(148,163,184,0.6);box-shadow:0 0 0 1px rgba(15,23,42,1),0 0 25px rgba(15,23,42,0.9);font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.16em;color:var(--color-text-soft)}.pill-track-dot{width:0.5rem;height:0.5rem;border-radius:999px;background:radial-gradient(circle at 30% 30%,#facc15,#f97316);box-shadow:0 0 0 4px rgba(250,204,21,0.35)}.meta-label{font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:0.2em;color:var(--color-text-soft)}.meta-value{font-family:var(--font-display);font-size:0.9rem;color:var(--gray-50)}.surface-subtle{background:rgba(15,23,42,0.82);border-radius:var(--radius-lg);border:1px solid rgba(148,163,184,0.35);box-shadow:var(--shadow-soft)}.surface-gradient{background:radial-gradient(circle at 0 0,rgba(56,189,248,0.18),transparent 55%),radial-gradient(circle at 100% 0,rgba(236,72,153,0.24),transparent 55%),rgba(15,23,42,0.96);border-radius:var(--radius-xl);border:1px solid rgba(148,163,184,0.4);box-shadow:var(--shadow-md)}.footnote{font-size:var(--font-size-xs);color:var(--color-text-soft)}.kbd{display:inline-flex;align-items:center;justify-content:center;min-width:1.6rem;padding:0.15rem 0.4rem;border-radius:6px;background:rgba(15,23,42,0.95);border:1px solid rgba(148,163,184,0.7);box-shadow:0 2px 0 rgba(15,23,42,1);font-size:0.78em;text-transform:uppercase;letter-spacing:0.12em;color:var(--gray-100)}.pill-key{display:inline-flex;align-items:center;gap:0.35rem;padding:0.18rem 0.55rem;border-radius:999px;background:rgba(15,23,42,0.96);border:1px solid rgba(148,163,184,0.6);font-size:var(--font-size-xs);color:var(--color-text-soft)}