:root{--bg-base:#fafaf5;--bg-surface:#f3f3ed;--bg-surface-hover:#ecece4;--border-color:#e8e8e0;--border-hover:#d4d4c8;--text-primary:#1a1a16;--text-secondary:#5c5c52;--text-muted:#96968c;--accent-primary:#5e6ad2;--accent-secondary:#828fff;--accent-soft:#5e6ad214;--color-error:#cf2d56;--color-success:#27a644;--color-warning:#d4a017;--bg-error:#fef5f7;--bg-success:#f0faf2;--bg-warning:#fffaf0;--sidebar-bg:#010102;--sidebar-text:#8a8f98;--sidebar-active-bg:#18191a;--sidebar-active-text:#f7f8f8;--sidebar-border:#2a2a2d;--progress-milestone:#5e6ad2;--progress-feature:#9fc9a2;--progress-fix:#dfa88f;--progress-lesson:#c0a8dd;--progress-metric:#9fbbe0;--sidebar-width:240px;--font-sans:"Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "SF Mono", "Menlo", monospace;--text-xs:.6875rem;--text-sm:.8125rem;--text-base:.9375rem;--text-lg:1.25rem;--text-xl:1.75rem;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:40px;--page-padding:32px;--radius-sm:4px;--radius-md:6px;--radius-lg:10px;--radius-xl:14px;--transition-fast:.12s ease;--transition:.2s ease;--shadow-card:0 1px 2px #0000000a;--shadow-dropdown:0 4px 16px #00000014;--header-height:0px;--nav-height:0px;--safe-area-bottom:env(safe-area-inset-bottom,0px)}@media (max-width:768px){:root{--nav-height:56px}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}html{-webkit-overflow-scrolling:touch}body{font-family:var(--font-sans);background-color:var(--bg-base);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;font-size:var(--text-base)}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 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(min-width:769px){::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ddd;border-radius:2px}::-webkit-scrollbar-thumb:hover{background:#bbb}}.gradient-text{background:linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800}.btn-primary{background:var(--accent-primary);color:#fff;border-radius:var(--radius-md);font-weight:500;font-size:var(--text-sm);transition:var(--transition-fast);border:none;justify-content:center;align-items:center;gap:6px;min-height:36px;padding:0 16px;display:inline-flex}.btn-primary:hover{background:var(--accent-secondary)}.btn-primary:active{transform:scale(.985)}.btn-primary:disabled{opacity:.4;cursor:not-allowed;transform:none}.btn-outline{color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);font-weight:500;font-size:var(--text-sm);transition:var(--transition-fast);background:0 0;align-items:center;gap:6px;min-height:36px;padding:0 16px;display:inline-flex}.btn-outline:hover{background:var(--bg-surface);border-color:var(--border-hover)}.chip{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;background:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;border-radius:9999px;align-items:center;min-height:26px;padding:2px 10px;font-weight:500;display:inline-flex}.chip.active{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.section-card{background:var(--bg-base);border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:var(--transition-fast);overflow:hidden}.section-card:hover{border-color:var(--border-hover)}.action-btn{border-radius:var(--radius-sm);font-size:var(--text-xs);transition:var(--transition-fast);white-space:nowrap;min-height:28px;color:var(--text-secondary);align-items:center;gap:4px;padding:4px 10px;font-weight:500;display:inline-flex}.action-btn:hover{background:var(--bg-surface);color:var(--text-primary)}.action-btn-accent{color:var(--text-secondary)}.action-btn-accent:hover{color:var(--accent-primary);background:var(--bg-surface)}.pricing-card{background:var(--bg-base);border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:var(--transition);flex-direction:column;padding:32px 24px;display:flex;position:relative}.pricing-card:hover{border-color:var(--border-hover)}.pricing-card-featured{background:var(--bg-surface);border-color:var(--accent-primary)}.price-tag{letter-spacing:-.03em;font-size:2.25rem;font-weight:700;font-family:var(--font-mono);align-items:baseline;gap:4px;margin-bottom:8px;display:flex}.price-period{font-size:var(--text-sm);color:var(--text-secondary);font-weight:400;font-family:var(--font-sans)}.feature-list{flex-direction:column;flex:1;gap:12px;margin:24px 0;padding:0;list-style:none;display:flex}.feature-item{font-size:var(--text-sm);color:var(--text-secondary);align-items:center;gap:12px;display:flex}.feature-item svg{color:var(--text-primary);flex-shrink:0}.badge-featured{background:var(--accent-primary);color:#fff;text-transform:uppercase;letter-spacing:.05em;border-radius:9999px;padding:2px 10px;font-size:.625rem;font-weight:600;position:absolute;top:20px;right:20px}.provider-btn{border-radius:var(--radius-md);border:1px solid var(--border-color);width:100%;min-height:44px;color:var(--text-primary);font-size:var(--text-sm);cursor:pointer;transition:var(--transition-fast);background:0 0;justify-content:center;align-items:center;gap:12px;padding:0 16px;font-weight:500;display:flex}.provider-btn:hover{background:var(--bg-surface)}.app-sidebar{display:flex}@media (max-width:767px){.app-sidebar{display:none}}@media (min-width:768px){.mobile-nav{display:none}}.mobile-nav{-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--border-color);height:56px;padding-bottom:var(--safe-area-bottom);z-index:100;background:#ffffffeb;justify-content:space-around;align-items:center;display:flex;position:fixed;bottom:0;left:0;right:0}.mobile-nav-item{color:var(--text-muted);flex-direction:column;align-items:center;gap:2px;min-width:64px;padding:8px 12px;display:flex}.mobile-nav-item.active{color:var(--accent-primary)}.mobile-nav-item:active{opacity:.7}.nav-label{font-size:.625rem;font-weight:500}@media 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