.auth-gate{display:flex;align-items:center;justify-content:center;min-height:100dvh;padding:1rem;background:linear-gradient(135deg,var(--color-primary-light) 0%,var(--color-primary) 100%)}.auth-card{background:var(--color-bg);border-radius:var(--border-radius);padding:2.5rem 2rem;width:100%;max-width:380px;box-shadow:var(--shadow-lg)}.auth-logo{text-align:center;margin-bottom:2rem}.auth-logo-icon{font-size:3rem;display:block;margin-bottom:.5rem}.auth-logo h1{font-size:1.75rem;color:var(--color-primary);margin-bottom:.25rem}.auth-subtitle{color:var(--color-text-light);font-size:.9rem}.auth-form{display:flex;flex-direction:column;gap:.75rem}.auth-input{padding:.75rem 1rem;border:1.5px solid #E0E0E0;border-radius:var(--border-radius-sm);font-size:1rem;transition:border-color var(--transition);outline:none;font-family:inherit}.auth-input:focus{border-color:var(--color-primary)}.auth-btn{margin-top:.5rem;padding:.85rem;background:var(--color-primary);color:#fff;border:none;border-radius:var(--border-radius-sm);font-size:1rem;font-weight:600;cursor:pointer;transition:background var(--transition),transform var(--transition)}.auth-btn:hover:not(:disabled){background:var(--color-primary-dark);transform:translateY(-1px)}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.auth-error{color:var(--color-error);font-size:.85rem;text-align:center}.auth-switch{display:block;width:100%;margin-top:1rem;padding:.5rem;background:none;border:none;color:var(--color-primary);font-size:.9rem;cursor:pointer;text-align:center}.auth-switch:hover{text-decoration:underline}.layout{display:flex;flex-direction:column;min-height:100dvh}.header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 1rem;background:var(--color-bg);border-bottom:1px solid #F0F0F0;box-shadow:var(--shadow-sm)}.header-left{display:flex;align-items:center;gap:.5rem}.header-logo{font-size:1.5rem}.header-title{font-size:1.25rem;font-weight:700;color:var(--color-primary)}.header-right{display:flex;align-items:center;gap:1rem}.header-stats{display:flex;gap:.75rem;font-size:.9rem;font-weight:600}.stat-xp{color:var(--color-xp)}.stat-streak{color:var(--color-streak)}.header-signout{background:none;border:none;font-size:1.25rem;cursor:pointer;padding:.25rem .5rem;border-radius:var(--border-radius-sm);transition:background var(--transition)}.header-signout:hover{background:var(--color-bg-secondary)}.main-content{flex:1;padding:1rem;padding-bottom:calc(64px + 1rem);max-width:var(--max-content-width);margin:0 auto;width:100%}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:100;display:flex;justify-content:space-around;align-items:center;height:64px;background:var(--color-bg);border-top:1px solid #F0F0F0;box-shadow:0 -2px 8px #0000000d;padding-bottom:env(safe-area-inset-bottom)}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:.5rem 1rem;text-decoration:none;color:var(--color-text-muted);font-size:.7rem;transition:color var(--transition)}.nav-item .nav-icon{font-size:1.4rem}.nav-item.active{color:var(--color-primary)}.nav-item.active .nav-label{font-weight:600}@media (min-width: 768px){.bottom-nav{position:fixed;top:var(--header-height);left:0;right:auto;bottom:0;width:var(--nav-width);height:auto;flex-direction:column;justify-content:flex-start;padding-top:1rem;gap:.5rem;border-top:none;border-right:1px solid #F0F0F0;box-shadow:none}.nav-item{padding:.75rem .5rem;width:100%}.main-content{padding-bottom:1rem;margin-left:var(--nav-width)}}.home-page{display:flex;flex-direction:column;gap:1.5rem}.home-greeting h1{font-size:1.5rem;color:var(--color-text)}.home-grade{color:var(--color-text-light);margin-top:.25rem}.home-actions{display:flex;flex-direction:column;gap:.75rem}.action-card{display:flex;align-items:center;gap:1rem;padding:1.25rem;border:none;border-radius:var(--border-radius);background:var(--color-bg-secondary);cursor:pointer;text-align:left;transition:transform var(--transition),box-shadow var(--transition);width:100%}.action-card:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-md)}.action-card:disabled{opacity:.5;cursor:not-allowed}.action-practice{border-left:4px solid var(--color-primary)}.action-review{border-left:4px solid var(--color-secondary)}.action-puzzle{border-left:4px solid var(--color-accent)}.action-icon{font-size:2rem}.action-text h3{font-size:1rem;margin-bottom:.15rem}.action-text p{font-size:.85rem;color:var(--color-text-light)}.home-progress h2{font-size:1.1rem;margin-bottom:.75rem}.progress-placeholder{padding:2rem;background:var(--color-bg-secondary);border-radius:var(--border-radius);text-align:center;color:var(--color-text-muted)}.chat-page{display:flex;align-items:center;justify-content:center;min-height:60vh}.chat-placeholder{text-align:center;color:var(--color-text-light)}.chat-placeholder-icon{font-size:4rem;display:block;margin-bottom:1rem}.chat-placeholder h2{margin-bottom:.5rem;color:var(--color-text)}:root{--color-primary: #6C5CE7;--color-primary-light: #A29BFE;--color-primary-dark: #4A3BB5;--color-secondary: #00CEC9;--color-accent: #FD79A8;--color-text: #2D3436;--color-text-light: #636E72;--color-text-muted: #B2BEC3;--color-bg: #FFFFFF;--color-bg-secondary: #F8F9FA;--color-bg-chat: #F0F0F5;--color-xp: #FDCB6E;--color-streak: #E17055;--color-success: #00B894;--color-error: #D63031;--header-height: 56px;--nav-width: 64px;--max-content-width: 800px;--border-radius: 12px;--border-radius-sm: 8px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--transition: .2s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--color-text);background:var(--color-bg);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}#root{min-height:100dvh;display:flex;flex-direction:column}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:100dvh;font-size:1.1rem;color:var(--color-text-light)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-text-muted);border-radius:3px}