:root{--color-bg-primary: #f8fafc;--color-bg-secondary: #ffffff;--color-bg-tertiary: #f1f5f9;--color-text-primary: #0f172a;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--color-accent: #2563eb;--color-accent-hover: #1d4ed8;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--color-study: #3b82f6;--color-revision: #8b5cf6;--font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .8125rem;--font-size-base: .875rem;--font-size-md: .9375rem;--font-size-lg: 1.0625rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--radius-xs: 4px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .04)}[data-theme=light]{--color-bg-primary: #f8fafc;--color-bg-secondary: #ffffff;--color-bg-tertiary: #f1f5f9;--color-text-primary: #0f172a;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--color-accent: #2563eb;--color-accent-hover: #1d4ed8}[data-theme=dark]{--color-bg-primary: #090d16;--color-bg-secondary: #0f172a;--color-bg-tertiary: #1e293b;--color-text-primary: #f8fafc;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-border: rgba(148, 163, 184, .14);--color-accent: #3b82f6;--color-accent-hover: #2563eb}@media(prefers-color-scheme:dark){:root:not([data-theme=light]),[data-theme=system]{--color-bg-primary: #090d16;--color-bg-secondary: #0f172a;--color-bg-tertiary: #1e293b;--color-text-primary: #f8fafc;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-border: rgba(148, 163, 184, .14);--color-accent: #3b82f6;--color-accent-hover: #2563eb}}*{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-family-base);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{background-color:var(--color-bg-primary);color:var(--color-text-primary);font-family:var(--font-family-base);min-height:100vh;line-height:1.5}input,select,textarea,button{font-family:inherit}input:focus,select:focus,textarea:focus{outline:2px solid var(--color-accent);outline-offset:1px;border-color:var(--color-accent)!important}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}.desktop-nav-container{display:flex}.mobile-bottom-nav{display:none}@media(max-width:767px){.desktop-nav-container{display:none!important}.mobile-bottom-nav{display:flex!important;position:fixed;bottom:0;left:0;right:0;height:58px;background-color:var(--color-bg-secondary);border-top:1px solid var(--color-border);z-index:1000;justify-content:space-around;align-items:center;padding:0 4px;box-shadow:0 -2px 10px #0000000d;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.mobile-nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;height:100%;border:none;background:transparent;cursor:pointer;padding:6px 0;gap:3px;color:var(--color-text-secondary);transition:all .15s ease}.mobile-nav-item.active{color:var(--color-accent)}.mobile-nav-item.active svg{stroke:var(--color-accent)}.mobile-nav-label{font-size:.68rem;font-weight:500}.main-content-container{padding-bottom:76px!important}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:.6}50%{opacity:.3}}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(16px)}to{opacity:1;transform:translate(0)}}