@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap";:root{--color-primary:#0b63ff;--color-primary-hover:#084ed1;--color-secondary:#22b7ff;--color-accent:#00e0b8;--color-background:#f5fbff;--color-background-soft:#fcfeff;--color-surface:#fff;--color-text:#0d1b2a;--color-text-secondary:#5b6675;--color-border:#dcebff;--color-success:#00b894;--color-warning:#f59e0b;--color-error:#e53935;--shadow-sm:0 4px 10px #0b63ff0d;--shadow-md:0 12px 30px #0b63ff1a;--shadow-lg:0 20px 50px #0b63ff2e;--radius-sm:10px;--radius-md:14px;--radius-lg:20px;--transition:.25s ease}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth}body{background:linear-gradient(180deg, #fff, #f9fcff 40%, 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pre{color:#fff;background:#0d1b2a;border-radius:12px;padding:1rem;overflow-x:auto}.topic-lock{margin-left:auto;font-size:.9rem}.sidebar{border:1px solid var(--border);background:#fff;border-radius:20px;align-self:start;max-height:calc(100vh - 120px);padding:1.5rem;position:sticky;top:20px;overflow-y:auto}.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-thumb{background:#c8dfff;border-radius:10px}@media (width<=768px){.topic-layout{grid-template-columns:1fr;gap:0;padding:1rem}.sidebar{display:none}.content{width:100%;min-width:0;padding:0}.breadcrumb{white-space:nowrap;margin-bottom:1rem;font-size:.85rem;overflow-x:auto}.topic-header{text-align:center;flex-direction:column;gap:1rem}.topic-navigation{flex-direction:column;gap:1rem}.topic-navigation button{white-space:normal;text-align:center;width:100%}.content{padding:1.25rem}.content h1{font-size:1.8rem}.content table{white-space:nowrap;border-collapse:collapse;display:block;overflow-x:auto}.content 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var(--color-primary)}.best-badge{background:var(--color-primary);color:#fff;border-radius:999px;margin-bottom:1rem;padding:.25rem .75rem;font-size:.8rem;display:inline-block}.active-card{text-align:center}.confirm-dialog-backdrop{z-index:1000;background:#00000059;justify-content:center;align-items:center;padding:1.5rem;display:flex;position:fixed;inset:0}.confirm-dialog{flex-direction:column;gap:1rem;width:100%;max-width:420px;display:flex}.confirm-dialog-title{margin:0;font-size:1.25rem;font-weight:600}.confirm-dialog-message{color:var(--color-text-secondary);margin:0;line-height:1.6}.confirm-dialog-actions{justify-content:flex-end;gap:.75rem;margin-top:.5rem;display:flex}@media (width<=480px){.confirm-dialog{max-width:100%}.confirm-dialog-actions{flex-direction:column-reverse}.confirm-dialog-actions button{width:100%}}