.fsrs-page{--fsrs-gold:#ffc01e;--fsrs-gold-hover:#ffb515;--fsrs-gold-soft:#ffc01e29;--fsrs-gold-border:#ffc01e7a;--fsrs-gold-glow:#ffc01e38;--fsrs-logo-bg:#1a1a1a;color:#1d1d1f;background:#fff;flex-direction:column;min-height:100vh;padding-top:64px;display:flex}.fsrs-page main{flex:1;justify-content:center;align-items:flex-start;display:flex}.fsrs-shell{width:100%;max-width:1180px;margin:0 auto;padding:0 24px 80px}.fsrs-hero{text-align:center;max-width:720px;margin:0 auto;padding:48px 0 56px}.fsrs-hero-title{text-align:center;letter-spacing:-.03em;color:#1d1d1f;margin:0 0 16px;font-size:clamp(28px,3vw,36px);font-weight:500;line-height:1.15}@media (min-width:768px){.fsrs-hero-title{white-space:nowrap}}.fsrs-hero-lede{letter-spacing:-.01em;color:#6e6e73;max-width:52ch;margin:0 auto;font-size:clamp(17px,2.2vw,21px);font-weight:400;line-height:1.5}.fsrs-layout{grid-template-columns:minmax(0,300px) minmax(0,1fr);align-items:start;gap:40px;display:grid}.fsrs-sidebar{flex-direction:column;gap:0;display:flex;position:sticky;top:88px}.fsrs-nav{flex-direction:column;gap:2px;display:flex}.fsrs-nav-btn{color:#6e6e73;text-align:left;cursor:pointer;background:0 0;border:none;border-radius:12px;align-items:center;gap:12px;width:100%;padding:12px 14px 12px 12px;font-size:15px;font-weight:500;line-height:1.25;transition:color .2s,background .2s;display:flex;position:relative}.fsrs-nav-btn:before{content:"";background:var(--fsrs-gold);border-radius:999px;width:3px;height:0;transition:height .22s cubic-bezier(.22,1,.36,1);position:absolute;top:50%;left:0;transform:translateY(-50%)}.fsrs-nav-icon{color:#86868b;background:#fffc;border:1px solid #0000000f;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;transition:background .2s,color .2s,border-color .2s,transform .2s;display:inline-flex}.fsrs-nav-label{letter-spacing:-.01em}.fsrs-nav-btn:hover,.fsrs-nav-btn:focus-visible{color:#1d1d1f;background:#ffffffb8;outline:none}.fsrs-nav-btn:hover .fsrs-nav-icon,.fsrs-nav-btn:focus-visible .fsrs-nav-icon{color:#1d1d1f;border-color:#0000001a}.fsrs-nav-btn.is-active{color:#1d1d1f;background:#fff;border:1px solid #0000;font-weight:500;box-shadow:0 1px 2px #0000000a,0 8px 24px -12px #0000001a}.fsrs-nav-btn.is-active:before{background:var(--fsrs-gold);width:4px;height:24px}.fsrs-nav-btn.is-active .fsrs-nav-icon{background:var(--fsrs-gold);border-color:var(--fsrs-gold);color:#1a1a1a;transform:scale(1.02)}.fsrs-tab-copy{border-top:1px solid #00000014;margin-top:28px;padding-top:24px}.fsrs-tab-copy p{color:#6e6e73;letter-spacing:-.005em;margin:0;font-size:15px;line-height:1.65}.fsrs-external-link{color:#1d1d1f;align-items:center;gap:4px;margin-top:16px;font-size:15px;font-weight:500;text-decoration:none;transition:color .15s;display:inline-flex}.fsrs-external-arrow{font-size:14px;transition:transform .15s}.fsrs-external-link:hover,.fsrs-external-link:focus-visible{color:#000}.fsrs-external-link:hover .fsrs-external-arrow{transform:translate(1px,-1px)}@keyframes fsrs-fade-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fsrs-fade-in{animation:.42s cubic-bezier(.22,1,.36,1) both fsrs-fade-in}.fsrs-visual-card{background:#fff;border:1px solid #0000000f;border-radius:24px;position:relative;overflow:hidden;box-shadow:inset 0 1px #fffc,0 24px 64px -32px #0000002e}.fsrs-visual-card:before{content:"";pointer-events:none;background:radial-gradient(80% 50% at 50% -20%,#ffc01e1a,#0000 55%),linear-gradient(#fff9 0%,#0000 40%);position:absolute;inset:0}.fsrs-visual-card-inner{padding:32px 32px 28px;position:relative}.fsrs-visual-head{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:28px;display:flex}.fsrs-visual-kicker{letter-spacing:.08em;text-transform:uppercase;color:#86868b;margin:0 0 6px;font-size:12px;font-weight:500}.fsrs-visual-head h2{letter-spacing:-.025em;color:#1d1d1f;margin:0;font-size:clamp(22px,2.4vw,28px);font-weight:500;line-height:1.15}.fsrs-visual-badge{background:var(--fsrs-gold);border:1px solid var(--fsrs-gold);color:#1a1a1a;letter-spacing:.02em;white-space:nowrap;border-radius:999px;flex-shrink:0;padding:6px 12px;font-size:11px;font-weight:500}.fsrs-curve-panel{background:#fff;border:1px solid #0000000f;border-radius:16px;margin-bottom:28px;padding:20px 16px 8px}.fsrs-curve-graphic{width:100%;height:auto;max-height:140px;display:block}.fsrs-curve-caption{color:#6e6e73;text-align:center;margin:12px 0 0;max-width:48ch;margin-inline:auto;font-size:14px;line-height:1.55}.fsrs-opensource-panel{text-align:center;background:#fff;border:1px solid #0000000f;border-radius:16px;flex-direction:column;align-items:center;gap:16px;margin-bottom:28px;padding:36px 24px;display:flex}.fsrs-opensource-mark{background:var(--fsrs-logo-bg);color:#fff;border-radius:28px;flex-direction:column;justify-content:center;align-items:center;width:96px;height:96px;display:flex;box-shadow:0 16px 40px -12px #00000073,0 0 0 1px #00000014}.fsrs-opensource-mark span{letter-spacing:-.02em;color:#fff;font-size:24px;font-weight:500;line-height:1}.fsrs-opensource-mark small{color:var(--fsrs-gold);letter-spacing:.06em;margin-top:5px;font-size:13px;font-weight:500}.fsrs-opensource-copy{color:#6e6e73;max-width:42ch;margin:0;font-size:15px;line-height:1.6}.fsrs-opensource-link{color:#1d1d1f;font-size:15px;font-weight:500;text-decoration:none}.fsrs-opensource-link:hover{color:#000}.fsrs-compare{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:28px;display:grid}.fsrs-compare-col{background:#fff;border:1px solid #00000014;border-radius:16px;padding:20px 18px;transition:border-color .25s,box-shadow .25s,transform .25s}.fsrs-compare-col--traditional{border-color:#00000014}.fsrs-compare-col--lr{border:1.5px solid var(--fsrs-gold-border);box-shadow:0 0 0 1px var(--fsrs-gold-glow), 0 10px 28px -18px #ffc01e47;background:#fff}.fsrs-visual-card--intervals .fsrs-compare-col--lr{border-color:var(--fsrs-gold);box-shadow:0 0 0 1px var(--fsrs-gold-glow), 0 14px 32px -16px #ffc01e59;transform:translateY(-2px)}.fsrs-visual-card--forgetting .fsrs-compare-col--traditional{border-color:#0000001a;box-shadow:0 8px 24px -16px #0000001f}.fsrs-compare-label{letter-spacing:.1em;text-transform:uppercase;color:#86868b;margin:0 0 14px;font-size:11px;font-weight:500}.fsrs-compare-col--lr .fsrs-compare-label{color:#1d1d1f}.fsrs-compare-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.fsrs-compare-list li{color:#1d1d1f;letter-spacing:-.01em;align-items:center;gap:14px;font-size:14px;line-height:1.4;display:flex}.fsrs-compare-dot{background:#aeaeb2;border-radius:50%;flex-shrink:0;width:7px;height:7px}.fsrs-compare-dot--accent{background:var(--fsrs-gold);width:8px;height:8px;box-shadow:0 0 0 6px var(--fsrs-gold-soft)}.fsrs-compare-outcome{text-align:center;color:#6e6e73;background:#fff;border:1px solid #00000014;border-radius:10px;margin:18px 0 0;padding:10px 12px;font-size:13px;font-weight:500}.fsrs-compare-outcome--accent{background:var(--fsrs-gold);color:#1a1a1a;border:1px solid var(--fsrs-gold);letter-spacing:-.01em;border-radius:12px;padding:12px 16px;font-size:14px;font-weight:500}.fsrs-timeline{border-top:1px solid #0000000f;padding-top:22px;transition:opacity .25s}.fsrs-timeline--muted{opacity:.55}.fsrs-timeline-label{letter-spacing:.1em;text-transform:uppercase;color:#86868b;margin:0 0 18px;font-size:11px;font-weight:500}.fsrs-timeline-track{justify-content:space-between;align-items:flex-start;padding:0 6px;display:flex;position:relative}.fsrs-timeline-line{background:linear-gradient(90deg, #d2d2d7 0%, var(--fsrs-gold) 100%);z-index:0;border-radius:999px;height:2px;position:absolute;top:6px;left:12px;right:12px}.fsrs-timeline-step{z-index:1;flex-direction:column;flex:1;align-items:center;gap:10px;min-width:0;display:flex;position:relative}.fsrs-timeline-dot{background:#fff;border:2px solid #d2d2d7;border-radius:50%;width:14px;height:14px;transition:border-color .2s,background .2s;box-shadow:0 0 0 4px #fff}.fsrs-timeline-step.is-final .fsrs-timeline-dot{background:var(--fsrs-gold);border-color:var(--fsrs-gold);box-shadow:0 0 0 4px #ffc01e33}.fsrs-timeline-text{color:#6e6e73;text-align:center;white-space:nowrap;letter-spacing:-.01em;font-size:12px;font-weight:500}.fsrs-timeline-step.is-final .fsrs-timeline-text{color:#1d1d1f}@media (max-width:960px){.fsrs-shell{padding:0 20px 64px}.fsrs-hero{padding:32px 0 40px}.fsrs-hero-title{white-space:normal;font-size:clamp(24px,5.2vw,30px)}.fsrs-layout{grid-template-columns:1fr;gap:32px}.fsrs-sidebar{position:static}.fsrs-nav{flex-flow:wrap;gap:8px}.fsrs-nav-btn{flex:calc(50% - 4px);width:auto;min-width:140px;padding:10px 12px;font-size:14px}.fsrs-nav-btn:before{display:none}.fsrs-compare{grid-template-columns:1fr}.fsrs-visual-card-inner{padding:24px 20px 22px}.fsrs-visual-head{flex-direction:column;align-items:flex-start}}@media (max-width:480px){.fsrs-nav-btn{flex:100%}.fsrs-timeline-track{justify-content:flex-start;gap:16px;padding-bottom:4px;overflow-x:auto}.fsrs-timeline-step{flex:none;min-width:56px}}[data-theme=dark] .fsrs-page{color:#f5f5f7;background:#000}[data-theme=dark] .fsrs-visual-kicker,[data-theme=dark] .fsrs-timeline-label,[data-theme=dark] .fsrs-compare-label{color:#a1a1a6}[data-theme=dark] .fsrs-hero-title,[data-theme=dark] .fsrs-visual-head h2,[data-theme=dark] .fsrs-nav-btn.is-active,[data-theme=dark] .fsrs-compare-col--lr .fsrs-compare-label{color:#f5f5f7}[data-theme=dark] .fsrs-hero-lede,[data-theme=dark] .fsrs-tab-copy p,[data-theme=dark] .fsrs-nav-btn,[data-theme=dark] .fsrs-curve-caption,[data-theme=dark] .fsrs-opensource-copy{color:#a1a1a6}[data-theme=dark] .fsrs-nav-icon{color:#86868b;background:#1c1c1e;border-color:#ffffff14}[data-theme=dark] .fsrs-nav-btn:hover,[data-theme=dark] .fsrs-nav-btn:focus-visible{color:#f5f5f7;background:#ffffff0a}[data-theme=dark] .fsrs-nav-btn.is-active{background:#1c1c1e;border-color:#0000;box-shadow:0 8px 32px -16px #0009}[data-theme=dark] .fsrs-nav-btn.is-active .fsrs-nav-icon{background:var(--fsrs-gold);border-color:var(--fsrs-gold);color:#1a1a1a}[data-theme=dark] .fsrs-tab-copy{border-top-color:#ffffff14}[data-theme=dark] .fsrs-external-link,[data-theme=dark] .fsrs-opensource-link{color:#f5f5f7}[data-theme=dark] .fsrs-external-link:hover,[data-theme=dark] .fsrs-opensource-link:hover{color:#fff}[data-theme=dark] .fsrs-visual-card{background:#1c1c1e;border-color:#ffffff14;box-shadow:0 32px 80px -32px #000000bf}[data-theme=dark] .fsrs-visual-card:before{background:radial-gradient(80% 50% at 50% -20%,#ffc01e14,#0000 55%),linear-gradient(#ffffff08 0%,#0000 40%)}[data-theme=dark] .fsrs-visual-badge{background:var(--fsrs-gold);border-color:var(--fsrs-gold);color:#1a1a1a}[data-theme=dark] .fsrs-curve-panel,[data-theme=dark] .fsrs-opensource-panel{background:#1c1c1e;border-color:#ffffff0f}[data-theme=dark] .fsrs-opensource-mark{background:var(--fsrs-logo-bg);color:#fff;box-shadow:0 16px 40px -12px #000000a6,0 0 0 1px #ffffff0f}[data-theme=dark] .fsrs-opensource-mark span{color:#fff}[data-theme=dark] .fsrs-compare-list li{color:#f5f5f7}[data-theme=dark] .fsrs-compare-col{background:#1c1c1e;border-color:#ffffff14}[data-theme=dark] .fsrs-compare-col--lr{border-color:var(--fsrs-gold-border);box-shadow:0 0 0 1px var(--fsrs-gold-glow), 0 10px 28px -18px #ffc01e33;background:#1c1c1e}[data-theme=dark] .fsrs-compare-outcome{color:#a1a1a6;background:#1c1c1e;border-color:#ffffff14}[data-theme=dark] .fsrs-compare-outcome--accent{background:var(--fsrs-gold);color:#1a1a1a;border-color:var(--fsrs-gold)}[data-theme=dark] .fsrs-timeline{border-top-color:#ffffff14}[data-theme=dark] .fsrs-timeline-line{background:linear-gradient(90deg, #48484a 0%, var(--fsrs-gold) 100%)}[data-theme=dark] .fsrs-timeline-dot{background:#1c1c1e;border-color:#48484a;box-shadow:0 0 0 4px #1c1c1e}[data-theme=dark] .fsrs-timeline-step.is-final .fsrs-timeline-dot{background:var(--fsrs-gold);border-color:var(--fsrs-gold);box-shadow:0 0 0 4px #ffc01e2e}[data-theme=dark] .fsrs-timeline-text{color:#a1a1a6}[data-theme=dark] .fsrs-timeline-step.is-final .fsrs-timeline-text{color:var(--fsrs-gold)}