:root{--background:#050a14;--background-alt:#0a1224;--panel:rgba(12,22,42,.72);--card:rgba(14,26,48,.65);--border:rgba(120,180,255,.18);--text:#eef4ff;--muted:#9fb0cc;--cyan:#22d3ee;--blue:#3b82f6;--purple:#a855f7;--success:#34d399;--warning:#fbbf24;--error:#f87171;--gradient-brand:linear-gradient(90deg,var(--cyan),var(--blue),var(--purple));--gradient-button:linear-gradient(135deg,#2563eb,#7c3aed);--shadow-glow:0 0 40px rgba(34,211,238,.15);--radius-lg:16px;--radius-md:12px;--radius-sm:8px;--font-sans:"Inter","Segoe UI",system-ui,sans-serif;--font-mono:"JetBrains Mono","Fira Code",monospace}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;background:var(--background);color:var(--text);font-family:var(--font-sans)}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}img{max-width:100%;height:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.SiteHeader_header__GlGmP{position:-webkit-sticky;position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:rgba(5,10,20,.75);border-bottom:1px solid var(--border)}.SiteHeader_inner__8dinU{max-width:1200px;margin:0 auto;padding:1rem 1.25rem;display:flex;align-items:center;gap:1rem}.SiteHeader_logo__mgLrT{display:flex;align-items:center;gap:.6rem;font-weight:700;letter-spacing:.02em}.SiteHeader_logoMark__bB_H2{width:36px;height:36px;object-fit:contain;flex-shrink:0}.SiteHeader_nav__nO_6V{display:none;gap:1.25rem;margin-left:auto;color:var(--muted)}.SiteHeader_nav__nO_6V a:focus-visible,.SiteHeader_nav__nO_6V a:hover{color:var(--text)}.SiteHeader_teacherBtn__7ECd6{margin-left:auto;padding:.55rem 1rem;border-radius:999px;border:1px solid var(--border);background:hsla(0,0%,100%,.03);font-size:.9rem}.SiteHeader_teacherBtn__7ECd6:focus-visible,.SiteHeader_teacherBtn__7ECd6:hover{border-color:rgba(34,211,238,.45);box-shadow:var(--shadow-glow)}@media (min-width:768px){.SiteHeader_nav__nO_6V{display:flex}.SiteHeader_teacherBtn__7ECd6{margin-left:0}}@media (max-width:767px){.SiteHeader_inner__8dinU{flex-wrap:wrap}}@keyframes hp-float{0%,to{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(0)}50%{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(calc(-10px * var(--hv-d-anim-intensity, 1)))}}@keyframes hp-float-slow{0%,to{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(0)}50%{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(calc(-6px * var(--hv-d-anim-intensity, 1)))}}@keyframes hp-pulse{0%,to{opacity:var(--hv-base-opacity,1)}50%{opacity:calc(var(--hv-base-opacity, 1) * .75)}}@keyframes hp-glow{0%,to{filter:drop-shadow(0 12px 30px rgba(0,0,0,.45))}50%{filter:drop-shadow(0 12px 36px rgba(59,130,246,.45))}}@keyframes hp-rotate-slow{0%{transform:var(--hv-anchor) rotate(0deg)}to{transform:var(--hv-anchor) rotate(1turn)}}@keyframes hp-bounce-soft{0%,to{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(0)}40%{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(calc(-8px * var(--hv-d-anim-intensity, 1)))}60%{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(calc(-4px * var(--hv-d-anim-intensity, 1)))}}@keyframes hp-fade{0%{opacity:0}to{opacity:var(--hv-base-opacity,1)}}@keyframes hp-fade-up{0%{opacity:0;transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(16px)}to{opacity:var(--hv-base-opacity,1);transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(0)}}@keyframes hp-slide-left{0%{opacity:0;transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateX(24px)}to{opacity:var(--hv-base-opacity,1);transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateX(0)}}@keyframes hp-slide-right{0%{opacity:0;transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateX(-24px)}to{opacity:var(--hv-base-opacity,1);transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateX(0)}}@keyframes hp-scale-in{0%{opacity:0;transform:var(--hv-anchor) rotate(var(--hv-rotate)) scale(.92)}to{opacity:var(--hv-base-opacity,1);transform:var(--hv-anchor) rotate(var(--hv-rotate)) scale(1)}}@keyframes hp-hover-lift{to{transform:var(--hv-anchor) rotate(var(--hv-rotate)) translateY(-6px)}}@keyframes hp-hover-glow{to{filter:drop-shadow(0 16px 40px rgba(59,130,246,.55))}}@keyframes hp-hover-scale{to{transform:var(--hv-anchor) rotate(var(--hv-rotate)) scale(1.04)}}@keyframes hp-hover-tilt{to{transform:var(--hv-anchor) rotate(calc(var(--hv-rotate) + 3deg))}}@keyframes hp-feature-scroll-fade-up{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes hp-feature-hover-lift{to{transform:translateY(-3px)}}@media (prefers-reduced-motion:reduce){[data-feature-card],[data-hv]{animation:none!important}}