@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');:root{--ld-bg:#fafaf8;--ld-bg-2:#f3f3f0;--ld-ink:#0d1b2a;--ld-text:#18181f;--ld-text-2:#52526a;--ld-text-3:#9898b4;--ld-accent:#4f46e5;--ld-accent-2:#8b5cf6;--ld-accent-glow:rgba(79,70,229,0.18);--ld-highlight:rgba(253,224,71,0.85);--ld-success:#10b981;--ld-science:#059669;--ld-ss:#1d66d4;--ld-warm:#c2410c;--ld-purple:#7a4ea0;--ld-border:rgba(0,0,0,0.07);--ld-line:rgba(13,27,42,0.10);--ld-line-soft:rgba(13,27,42,0.05);--ld-glass:rgba(255,255,255,0.72);--ld-glass-bdr:rgba(255,255,255,0.45);--ld-glass-shd:0 8px 36px rgba(79,70,229,0.09);--ld-card-shd:0 30px 60px -30px rgba(13,27,42,0.18);--ld-max-w:1100px;--ld-r-lg:20px;--ld-r-md:12px;--ld-r-pill:999px;--ld-nav-h:68px;--ld-font-essay:'Fraunces',Georgia,serif;--ld-font-mono:'JetBrains Mono',ui-monospace,'SF Mono',Consolas,monospace;--mastery-advanced:#1f8a5b;--mastery-proficient:#2f7a4f;--mastery-developing:#d98321;--mastery-beginning:#c14a3c;--mastery-none-bg:rgba(13,27,42,0.06);--mastery-none-ink:#5a6b7e;--framework-ccss:#7a4ea0;--framework-ngss:#1e6091;--framework-c3:#a44a3f;--status-warn:#d98321;--status-risk:#c14a3c;--status-good:#1f8a5b}body.dark-mode{--ld-bg:#0d0d18;--ld-bg-2:#12121e;--ld-ink:#f0f0fa;--ld-text:#f0f0fa;--ld-text-2:#9090b0;--ld-text-3:#5555780;--ld-border:rgba(255,255,255,0.08);--ld-line:rgba(255,255,255,0.10);--ld-line-soft:rgba(255,255,255,0.06);--ld-glass:rgba(18,18,32,0.78);--ld-glass-bdr:rgba(255,255,255,0.1);--ld-glass-shd:0 8px 36px rgba(0,0,0,0.5);--ld-card-shd:0 30px 60px -30px rgba(0,0,0,0.55);--ld-accent-glow:rgba(99,102,241,0.28);--ld-highlight:rgba(253,224,71,0.55);--ld-science:#34d399;--ld-ss:#60a5fa;--ld-purple:#c4a8e0;--ld-warm:#f97316}.ld-page *,.ld-page *::before,.ld-page *::after{box-sizing:border-box;margin:0;padding:0}.ld-page{background:var(--ld-bg);color:var(--ld-text);font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:16px;line-height:1.6;overflow-x:hidden;min-height:100vh}.ld-page a{text-decoration:none}.ld-container{max-width:var(--ld-max-w);margin:0 auto;padding:0 28px}.ld-section{padding:96px 0}.ld-section-label{font-size:0.78rem;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;color:var(--ld-accent);margin-bottom:12px}.ld-section-title{font-size:clamp(1.75rem,3.5vw,2.5rem);font-weight:800;line-height:1.2;color:var(--ld-text);margin-bottom:48px}.ld-btn-primary,.ld-btn-ghost{display:inline-flex;align-items:center;gap:6px;padding:13px 26px;border-radius:var(--ld-r-pill);font-family:'Inter',sans-serif;font-size:0.95rem;font-weight:600;cursor:pointer;transition:all 0.2s ease;border:none;white-space:nowrap}.ld-btn-primary{background:var(--ld-accent);color:#fff;box-shadow:0 4px 16px var(--ld-accent-glow)}.ld-btn-primary:hover{background:#4338ca;transform:translateY(-2px);box-shadow:0 8px 24px var(--ld-accent-glow);color:#fff}.ld-btn-ghost{background:transparent;color:var(--ld-text);border:1.5px solid var(--ld-border)}body.dark-mode .ld-btn-ghost{border-color:rgba(255,255,255,0.2)}.ld-btn-ghost:hover{background:rgba(79,70,229,0.07);border-color:var(--ld-accent);color:var(--ld-accent)}.ld-btn-lg{padding:16px 32px;font-size:1.05rem}.ld-btn-full{width:100%;justify-content:center}.ld-glass{background:var(--ld-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--ld-glass-bdr);border-radius:var(--ld-r-lg);box-shadow:var(--ld-glass-shd)}.ld-fade-in{opacity:0;transform:translateY(24px);transition:opacity 0.55s ease,transform 0.55s ease}.ld-fade-in.is-visible{opacity:1;transform:translateY(0)}.ld-fade-in:nth-child(2){transition-delay:0.1s}.ld-fade-in:nth-child(3){transition-delay:0.2s}.ld-nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--ld-nav-h);background:transparent;transition:background 0.3s ease,box-shadow 0.3s ease}.ld-nav.scrolled{background:var(--ld-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--ld-border)}.ld-nav-inner{max-width:var(--ld-max-w);margin:0 auto;padding:0 28px;height:100%;display:flex;align-items:center;justify-content:space-between}.ld-logo{font-size:1rem;font-weight:700;color:var(--ld-text);display:flex;align-items:center;gap:8px;letter-spacing:-0.01em}.ld-logo:hover{color:var(--ld-accent)}.ld-nav-actions{display:flex;align-items:center;gap:10px}.ld-nav-actions .ld-btn-ghost{padding:9px 20px;font-size:0.9rem}.ld-nav-actions .ld-btn-primary{padding:9px 20px;font-size:0.9rem}.ld-pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start}.ld-pricing-card{padding:36px 32px;border-radius:var(--ld-r-lg);background:var(--ld-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--ld-glass-bdr);box-shadow:var(--ld-glass-shd);position:relative}.ld-pricing-featured{border-color:rgba(79,70,229,0.3);box-shadow:0 8px 48px var(--ld-accent-glow);transform:scale(1.03)}.ld-plan-badge{display:inline-block;font-size:0.72rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:#fff;background:linear-gradient(135deg,var(--ld-accent),var(--ld-accent-2));padding:4px 12px;border-radius:var(--ld-r-pill);margin-bottom:16px}.ld-plan-name{font-size:1rem;font-weight:700;color:var(--ld-text-2);margin-bottom:8px}.ld-plan-price{font-size:2.8rem;font-weight:800;color:var(--ld-text);line-height:1;letter-spacing:-0.03em}.ld-plan-price span{font-size:1rem;font-weight:500;color:var(--ld-text-2)}.ld-plan-period{font-size:0.82rem;color:var(--ld-text-3);margin-top:4px;margin-bottom:28px}.ld-plan-features{list-style:none;display:flex;flex-direction:column;gap:10px;margin-bottom:32px}.ld-plan-features li{font-size:0.9rem;color:var(--ld-text-2);padding-left:22px;position:relative}.ld-plan-features li::before{content:'✓';position:absolute;left:0;color:var(--ld-success);font-weight:700;font-size:0.85rem}.ld-footer{border-top:1px solid var(--ld-border);padding:32px 0}.ld-footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px}.ld-footer-brand{font-weight:700;font-size:0.9rem;color:var(--ld-text)}.ld-footer-links{display:flex;gap:24px}.ld-footer-links a{font-size:0.85rem;color:var(--ld-text-2);transition:color 0.2s}.ld-footer-links a:hover{color:var(--ld-accent)}.ld-footer-copy{font-size:0.82rem;color:var(--ld-text-3)}.ld-theme-btn{position:fixed;bottom:24px;right:24px;z-index:200;width:44px;height:44px;border-radius:50%;border:1.5px solid var(--ld-border);background:var(--ld-glass);backdrop-filter:blur(12px);cursor:pointer;font-size:1.1rem;display:flex;align-items:center;justify-content:center;box-shadow:var(--ld-glass-shd);transition:transform 0.2s}.ld-theme-btn:hover{transform:scale(1.1)}.ld-theme-btn-nav{position:static;width:36px;height:36px;font-size:0.95rem;flex-shrink:0}.ld-theme-btn-nav:hover{transform:scale(1.08)}@media (max-width:900px){.ld-hero-inner{grid-template-columns:1fr;gap:48px;text-align:center}.ld-hero-sub{max-width:100%}.ld-hero-ctas{justify-content:center}.ld-hero-visual{height:280px}.ld-features-grid{grid-template-columns:1fr;gap:16px}.ld-steps{grid-template-columns:1fr;gap:12px}.ld-step-arrow{display:none}.ld-pricing-grid{grid-template-columns:1fr;max-width:440px;margin:0 auto}.ld-pricing-featured{transform:scale(1)}.ld-diff-inner{padding:40px 32px}.ld-capture-inner{padding:40px 28px}.ld-footer-inner{justify-content:center;text-align:center}}@media (max-width:520px){.ld-section{padding:64px 0}.ld-hero{padding-top:calc(var(--ld-nav-h) + 48px);padding-bottom:64px}.ld-hero-visual{height:220px}.ld-mock-card-2{display:none}.ld-hero-title{font-size:2rem}.ld-hero-ctas{flex-direction:column;align-items:stretch}.ld-hero-ctas .ld-btn-lg{text-align:center;justify-content:center}.ld-nav-inner{padding:0 16px}.ld-container{padding:0 16px}.ld-feature-card{padding:28px 24px}.ld-diff-subjects{flex-direction:column;align-items:center}.ld-diff-subjects .ld-subject-plus{transform:rotate(90deg)}.ld-capture-form{flex-direction:column;align-items:stretch}.ld-input{min-width:0}.ld-footer-links{flex-wrap:wrap;justify-content:center;gap:16px}}.ld-page-header{text-align:center;margin:0 auto 32px;padding:32px 0 24px;max-width:720px}.ld-page-header .ld-eyebrow{display:inline-block;margin-bottom:12px}.ld-page-header h1{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;color:var(--ld-text);margin:0 0 12px;line-height:1.15;letter-spacing:-0.01em}.ld-page-header p{font-size:1.05rem;color:var(--ld-text-2);line-height:1.5;margin:0}.ld-banner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;background:linear-gradient(135deg,rgba(79,70,229,0.08),rgba(139,92,246,0.08));border:1px solid var(--ld-border);border-radius:var(--ld-r-md);padding:14px 22px;margin-bottom:24px}body.dark-mode .ld-banner{background:linear-gradient(135deg,rgba(99,102,241,0.18),rgba(139,92,246,0.14))}.ld-banner-text{font-size:0.95rem;color:var(--ld-text);line-height:1.5}.ld-banner-text strong{font-weight:700}.ld-banner-text .ld-banner-muted{color:var(--ld-text-2)}.ld-banner-cta{flex-shrink:0}.ld-filter-bar{background:var(--ld-bg-2);border:1px solid var(--ld-border);border-radius:var(--ld-r-md);padding:18px 20px;margin-bottom:28px;display:flex;flex-direction:column;gap:14px}body.dark-mode .ld-filter-bar{background:rgba(255,255,255,0.04)}.ld-search{display:flex;align-items:center;gap:10px;background:var(--ld-bg);border:1.5px solid var(--ld-border);border-radius:var(--ld-r-pill);padding:8px 18px;transition:border-color 0.2s,box-shadow 0.2s}body.dark-mode .ld-search{background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.12)}.ld-search:focus-within{border-color:var(--ld-accent);box-shadow:0 0 0 3px var(--ld-accent-glow)}.ld-search input{flex:1;border:0;background:transparent;font-family:'Inter',sans-serif;font-size:0.95rem;color:var(--ld-text);outline:none}.ld-search input::placeholder{color:var(--ld-text-3)}.ld-search-icon{color:var(--ld-text-3);flex-shrink:0}.ld-pills{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.ld-pill-label{font-size:0.78rem;font-weight:600;color:var(--ld-text-2);text-transform:uppercase;letter-spacing:0.05em;margin-right:6px}.ld-pill{padding:6px 14px;border-radius:var(--ld-r-pill);border:1.5px solid var(--ld-border);background:var(--ld-bg);color:var(--ld-text-2);font-family:'Inter',sans-serif;font-size:0.85rem;font-weight:500;cursor:pointer;transition:all 0.15s ease}body.dark-mode .ld-pill{background:rgba(255,255,255,0.04);border-color:rgba(255,255,255,0.12)}.ld-pill:hover{border-color:var(--ld-accent);color:var(--ld-accent)}.ld-pill.active{background:var(--ld-accent);border-color:var(--ld-accent);color:#fff}.ld-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}.ld-tile{background:var(--ld-bg-2);border:1px solid var(--ld-border);border-radius:var(--ld-r-md);padding:20px;display:flex;flex-direction:column;gap:10px;text-decoration:none;color:inherit;transition:transform 0.15s ease,border-color 0.15s ease,box-shadow 0.15s ease}body.dark-mode .ld-tile{background:rgba(255,255,255,0.04)}.ld-tile:hover{border-color:var(--ld-accent);transform:translateY(-2px);box-shadow:0 6px 20px var(--ld-accent-glow);color:inherit}.ld-tile-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:0.75rem;color:var(--ld-text-2);font-weight:500}.ld-tile-grade{display:inline-block;padding:2px 8px;background:var(--ld-accent-glow);color:var(--ld-accent);border-radius:4px;font-weight:700}body.dark-mode .ld-tile-grade{background:rgba(99,102,241,0.2);color:#a5b4fc}.ld-tile-cat{display:inline-flex;align-items:center;gap:4px}.ld-tile-title{font-size:1.05rem;font-weight:700;color:var(--ld-text);margin:0;line-height:1.3}.ld-tile-desc{font-size:0.85rem;color:var(--ld-text-2);line-height:1.45;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:1;margin:0}.ld-tile-footer{display:flex;justify-content:space-between;align-items:center;margin-top:6px;padding-top:12px;border-top:1px solid var(--ld-border)}.ld-tile-standard{font-size:0.72rem;color:var(--ld-text-3);font-family:ui-monospace,'SF Mono',Consolas,monospace;font-weight:600;letter-spacing:0.02em}.ld-tile-cta{font-size:0.85rem;font-weight:600;color:var(--ld-accent)}.ld-empty{text-align:center;padding:60px 24px;color:var(--ld-text-2);font-size:0.95rem}.ld-cta-block{margin-top:60px;padding:40px 32px;background:linear-gradient(135deg,var(--ld-accent),var(--ld-accent-2));border-radius:var(--ld-r-lg);text-align:center;color:#fff;box-shadow:0 12px 40px var(--ld-accent-glow)}.ld-cta-block h2{font-size:1.5rem;font-weight:800;margin:0 0 12px;letter-spacing:-0.01em}.ld-cta-block p{font-size:1rem;opacity:0.95;margin:0 auto 20px;max-width:540px;line-height:1.5}.ld-cta-block .ld-btn-primary{background:#fff;color:var(--ld-accent);box-shadow:0 4px 16px rgba(0,0,0,0.12)}.ld-cta-block .ld-btn-primary:hover{background:#fff;color:var(--ld-accent);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.18)}.ld-page-body{min-height:100vh;padding-top:calc(var(--ld-nav-h) + 16px);padding-bottom:80px}@media (max-width:720px){.ld-banner{flex-direction:column;text-align:center}.ld-grid{grid-template-columns:1fr}.ld-cta-block{padding:32px 22px}}