:root{--primary: #10b981;--primary-hover: #059669;--secondary: #3b82f6;--accent: #f59e0b;--bg-main: #f8fafc;--bg-card: #ffffff;--bg-hover: #f1f5f9;--text-main: #020617;--text-muted: #475569;--text-light: #1e293b;--border: #cbd5e1;--radius: 8px;--shadow: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--slider-track-empty: rgba(71, 85, 105, .22);--slider-thumb: #ffffff;--slider-thumb-border: rgba(15, 23, 42, .14);--font-sans: "Inter", system-ui, Avenir, Helvetica, Arial, sans-serif}[data-theme=dark]{--bg-main: #0f172a;--bg-card: #1e293b;--bg-hover: #334155;--text-main: #f8fafc;--text-muted: #cbd5e1;--text-light: #f1f5f9;--border: #334155;--shadow: 0 4px 6px -1px rgb(0 0 0 / .3), 0 2px 4px -2px rgb(0 0 0 / .3);--slider-track-empty: rgba(148, 163, 184, .32);--slider-thumb-border: rgba(15, 23, 42, .45)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-main);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased;transition:background-color .3s ease,color .3s ease}.theme-toggle-static{border-radius:999px;background-color:var(--bg-card);color:var(--text-main);border:1px solid var(--border);box-shadow:var(--shadow);display:inline-flex;align-items:center;justify-content:center;gap:.45rem;font-size:.82rem;font-weight:600;line-height:1;padding:.48rem .78rem;min-height:2rem;cursor:pointer;-webkit-user-select:none;user-select:none;transition:box-shadow .2s ease,transform .15s ease,background-color .2s ease}.theme-toggle-bar{width:1.2rem;height:.5rem;border-radius:999px;background:var(--toggle-bar-color);box-shadow:inset 0 0 0 1px #ffffff59}.theme-toggle-static-light{--toggle-bar-color: linear-gradient(90deg, #f59e0b, #f97316);background-color:#f59e0b14;border-color:#f59e0b59}.theme-toggle-static-dark{--toggle-bar-color: linear-gradient(90deg, #60a5fa, #2563eb)}.theme-toggle-static:hover{box-shadow:0 10px 15px -3px #00000026,0 4px 6px -4px #0000001a;transform:translateY(-1px)}.theme-toggle-static:active{transform:translateY(0)}@media(max-width:768px){.theme-toggle-static{font-size:.78rem;padding:.45rem .72rem}}a{color:var(--primary);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-hover)}button{cursor:pointer;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;border-radius:var(--radius);font-weight:500;transition:all .2s;border:none;font-size:.95rem}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover)}.btn-outline{background-color:transparent;border:1px solid var(--border);color:var(--text-main)}.btn-outline:hover{background-color:var(--bg-hover)}.landing-hero{min-height:100svh;display:flex;align-items:center;justify-content:center;padding:.9rem 1.5rem 1.1rem;background:radial-gradient(ellipse at top,rgba(16,185,129,.1) 0%,transparent 60%)}.landing-hero-inner{width:100%;max-width:1280px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:1.2rem;align-items:center}.landing-hero-copy{min-width:0;text-align:left}.landing-hero-actions{display:flex;gap:.75rem;flex-wrap:wrap}.landing-hero-preview{min-width:0}.landing-hero-widget{height:min(700px,calc(100svh - 80px))}.lesson-container{display:flex;height:100vh;flex-direction:column}.lesson-content-wrapper{display:flex;flex:1;overflow:hidden}.lesson-text-column{flex:1;padding:2rem;overflow-y:auto;border-right:1px solid var(--border);max-width:50%}.lesson-text-full{flex:1;padding:2rem;overflow-y:auto;max-width:100%;border-right:none}.lesson-widget-column{flex:1;padding:2rem;background-color:#0003;display:flex;flex-direction:column;overflow-y:auto;min-width:0}.lesson-widget-column>*{min-width:0}.lesson-widget-column .recharts-legend-wrapper{width:100%!important}.lesson-widget-column .recharts-default-legend{display:flex!important;flex-wrap:wrap;justify-content:center;gap:.3rem .8rem;margin-top:.2rem;white-space:normal}.lesson-widget-column .recharts-legend-item{margin-right:0!important}.lesson-widget-column .recharts-legend-item-text{font-size:.76rem}@media(max-width:900px){.landing-hero{min-height:auto;padding:1.5rem 1rem 2.25rem}.landing-hero-inner{grid-template-columns:1fr;max-width:940px;gap:1rem}.landing-hero-copy{text-align:center}.landing-hero-actions{justify-content:center}.landing-hero-widget{height:min(760px,calc(100svh - 24px))}.lesson-container{height:auto;min-height:100vh}.lesson-content-wrapper{flex-direction:column;overflow:visible}.lesson-text-column{max-width:100%;border-right:none;border-bottom:1px solid var(--border);overflow-y:visible}.lesson-widget-column{overflow-y:visible}}@media(max-width:480px){.landing-hero{padding:1.2rem .75rem 1.6rem}.landing-hero-widget{height:min(740px,calc(100svh - 16px))}.container{padding:0 .75rem}.lesson-text-column,.lesson-text-full,.lesson-widget-column{padding:1rem}.lesson-widget-column .recharts-legend-item-text{font-size:.72rem}}.mobile-wrap{flex-wrap:wrap}@media(max-width:600px){.mobile-wrap{flex-direction:column;align-items:stretch;gap:.75rem}}.landing-slider{-webkit-appearance:none;appearance:none;width:100%;height:8px;border-radius:999px;outline:none;border:1px solid var(--border);background-color:var(--slider-track-empty)}.landing-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--slider-thumb);border:2px solid var(--slider-thumb-border);cursor:pointer;box-shadow:0 0 5px #0000004d}.landing-slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--slider-thumb);border:2px solid var(--slider-thumb-border);cursor:pointer;box-shadow:0 0 5px #0000004d}.landing-slider-years::-webkit-slider-thumb{background:var(--secondary)}.landing-slider-years::-moz-range-thumb{background:var(--secondary)}