:root{--color-primary: #ff6b35;--color-primary-light: #ff8c5a;--color-primary-dark: #e55a2b;--color-primary-bg: #fff3ed;--color-secondary: #3b82f6;--color-secondary-light: #60a5fa;--color-secondary-dark: #2563eb;--color-secondary-bg: #eff6ff;--color-accent: #22c55e;--color-accent-light: #4ade80;--color-accent-dark: #16a34a;--color-accent-bg: #f0fdf4;--color-tertiary: #8b5cf6;--color-tertiary-light: #a78bfa;--color-tertiary-bg: #f5f3ff;--color-yellow: #fbbf24;--color-yellow-light: #fcd34d;--color-yellow-bg: #fffbeb;--color-pink: #ec4899;--color-pink-light: #f472b6;--color-pink-bg: #fdf2f8;--color-bg: #faf7f5;--color-surface: #ffffff;--color-surface-alt: #f8f5f2;--color-text: #2d2a26;--color-text-secondary: #78716c;--color-text-muted: #a8a29e;--color-border: #e7e5e4;--color-border-light: #f5f5f4;--color-correct: #22c55e;--color-correct-bg: #dcfce7;--color-incorrect: #ef4444;--color-incorrect-bg: #fef2f2;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .1);--shadow-glow: 0 0 20px rgba(255, 107, 53, .15);--shadow-card: 0 2px 8px rgba(0, 0, 0, .06), 0 0 0 1px rgba(0, 0, 0, .02);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--font-hindi: "Baloo 2", "Noto Sans Devanagari", sans-serif;--font-english: "Quicksand", sans-serif;--font-mono: "JetBrains Mono", monospace;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--transition-bounce: .5s cubic-bezier(.34, 1.56, .64, 1);--sidebar-width: 260px;--bottomnav-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-english);background:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.hindi,.hindi-text{font-family:var(--font-hindi)}h1,h2,h3,h4,h5,h6{font-family:var(--font-hindi);font-weight:700;line-height:1.3;color:var(--color-text)}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-dark)}.app-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:linear-gradient(180deg,#ff6b35,#ff8c5a,#ffa07a);color:#fff;position:fixed;top:0;left:0;bottom:0;z-index:100;display:flex;flex-direction:column;overflow-y:auto;box-shadow:2px 0 20px #00000014}.sidebar-header{padding:var(--space-lg) var(--space-md);text-align:center;border-bottom:1px solid rgba(255,255,255,.2)}.sidebar-logo{font-family:var(--font-hindi);font-size:1.5rem;font-weight:800;color:#fff;display:flex;align-items:center;justify-content:center;gap:var(--space-sm)}.sidebar-profile{padding:var(--space-md);display:flex;align-items:center;gap:var(--space-sm);background:#ffffff26;border-radius:var(--radius-md);margin:var(--space-md);font-weight:600;font-size:.95rem}.sidebar-profile .avatar{width:36px;height:36px;border-radius:var(--radius-full);background:#ffffff4d;display:flex;align-items:center;justify-content:center;font-size:1.1rem}.sidebar-nav{flex:1;display:flex;flex-direction:column;gap:2px;padding:var(--space-sm) var(--space-sm)}.sidebar-link{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);color:#ffffffd9;border-radius:var(--radius-md);font-weight:500;font-size:.95rem;text-decoration:none;transition:all var(--transition-fast);cursor:pointer}.sidebar-link:hover{background:#ffffff26;color:#fff;transform:translate(2px)}.sidebar-link.active{background:#ffffff40;color:#fff;font-weight:700;box-shadow:inset 3px 0 #fff}.sidebar-link .icon{font-size:1.2rem;width:24px;display:flex;align-items:center;justify-content:center}.sidebar-footer{padding:var(--space-md);border-top:1px solid rgba(255,255,255,.2)}.main-content{flex:1;margin-left:var(--sidebar-width);padding:var(--space-xl);max-width:900px}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:var(--bottomnav-height);background:#fff;border-top:1px solid var(--color-border);box-shadow:0 -2px 10px #0000000d;z-index:100;justify-content:space-around;align-items:center;padding:0 var(--space-xs)}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;font-size:.65rem;color:var(--color-text-muted);text-decoration:none;padding:var(--space-xs);border-radius:var(--radius-sm);transition:color var(--transition-fast);font-weight:500;min-width:0;flex:1}.bottom-nav-item .icon{font-size:1.3rem}.bottom-nav-item.active{color:var(--color-primary);font-weight:700}.bottom-nav-item:hover{color:var(--color-primary)}.mobile-header{display:none;position:sticky;top:0;left:0;right:0;height:56px;background:linear-gradient(135deg,#ff6b35,#ff8c5a);color:#fff;align-items:center;padding:0 var(--space-md);z-index:200;box-shadow:0 2px 8px #ff6b3533}.mobile-header-title{font-family:var(--font-hindi);font-weight:800;font-size:1.2rem;flex:1;text-align:center}.hamburger-btn{background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:var(--space-sm);border-radius:var(--radius-sm);transition:background var(--transition-fast);display:flex;align-items:center;justify-content:center}.hamburger-btn:hover{background:#ffffff26}.mobile-drawer-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:300;opacity:0;transition:opacity var(--transition-base)}.mobile-drawer-overlay.open{display:block;opacity:1}.mobile-drawer{position:fixed;top:0;left:-280px;width:280px;height:100%;background:linear-gradient(180deg,#ff6b35,#ff8c5a,#ffa07a);z-index:301;transition:left var(--transition-base);display:flex;flex-direction:column;overflow-y:auto}.mobile-drawer.open{left:0}.card{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.card:hover{box-shadow:var(--shadow-md)}.card-interactive:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);border:none;border-radius:var(--radius-full);font-family:var(--font-english);font-size:.95rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn-primary{background:var(--color-primary);color:#fff;box-shadow:0 2px 8px #ff6b354d}.btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px #ff6b3566}.btn-secondary{background:var(--color-secondary);color:#fff;box-shadow:0 2px 8px #3b82f64d}.btn-secondary:hover{background:var(--color-secondary-dark);transform:translateY(-1px)}.btn-accent{background:var(--color-accent);color:#fff;box-shadow:0 2px 8px #22c55e4d}.btn-accent:hover{background:var(--color-accent-dark);transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--color-text-secondary);box-shadow:none}.btn-ghost:hover{background:var(--color-surface-alt);color:var(--color-text)}.btn-outline{background:transparent;color:var(--color-primary);border:2px solid var(--color-primary)}.btn-outline:hover{background:var(--color-primary);color:#fff}.btn-sm{padding:6px 14px;font-size:.85rem}.btn-lg{padding:14px 32px;font-size:1.1rem}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.choice-btn{display:block;width:100%;padding:var(--space-md) var(--space-lg);background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-md);font-family:var(--font-hindi);font-size:1.1rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);text-align:left}.choice-btn:hover{border-color:var(--color-primary);background:var(--color-primary-bg);transform:translate(4px)}.choice-btn.correct{border-color:var(--color-correct);background:var(--color-correct-bg);color:var(--color-accent-dark)}.choice-btn.incorrect{border-color:var(--color-incorrect);background:var(--color-incorrect-bg);color:var(--color-incorrect)}.badge{display:inline-flex;align-items:center;gap:var(--space-xs);padding:4px 12px;border-radius:var(--radius-full);font-size:.8rem;font-weight:600}.badge-primary{background:var(--color-primary-bg);color:var(--color-primary-dark)}.badge-secondary{background:var(--color-secondary-bg);color:var(--color-secondary-dark)}.badge-accent{background:var(--color-accent-bg);color:var(--color-accent-dark)}.badge-tertiary{background:var(--color-tertiary-bg);color:var(--color-tertiary)}.progress-ring{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs)}.progress-ring svg{transform:rotate(-90deg)}.progress-ring-bg{fill:none;stroke:var(--color-border-light);stroke-width:6}.progress-ring-fill{fill:none;stroke-width:6;stroke-linecap:round;transition:stroke-dashoffset var(--transition-slow)}.stat-card{text-align:center;padding:var(--space-md)}.stat-value{font-size:2rem;font-weight:800;font-family:var(--font-hindi);line-height:1}.stat-label{font-size:.8rem;color:var(--color-text-secondary);margin-top:var(--space-xs);font-weight:500}.page-header{margin-bottom:var(--space-xl)}.page-header h1{font-size:1.75rem;display:flex;align-items:center;gap:var(--space-sm)}.page-header .subtitle{color:var(--color-text-secondary);font-size:.95rem;margin-top:var(--space-xs)}.grade-selector{display:flex;gap:var(--space-sm);flex-wrap:wrap;margin-bottom:var(--space-lg)}.grade-btn{padding:var(--space-sm) var(--space-md);border:2px solid var(--color-border);border-radius:var(--radius-full);background:var(--color-surface);font-weight:600;font-size:.9rem;cursor:pointer;transition:all var(--transition-fast)}.grade-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.grade-btn.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.flashcard-container{perspective:1000px;width:100%;max-width:340px;margin:0 auto}.flashcard{width:100%;aspect-ratio:3/4;position:relative;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.34,1.56,.64,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-xl);box-shadow:var(--shadow-lg)}.flashcard-front{background:linear-gradient(135deg,#ff6b35,#ff8c5a);color:#fff}.flashcard-back{background:linear-gradient(135deg,#3b82f6,#60a5fa);color:#fff;transform:rotateY(180deg)}.flashcard-char{font-family:var(--font-hindi);font-size:5rem;font-weight:800;line-height:1;text-shadow:0 2px 10px rgba(0,0,0,.15)}.flashcard-hint{font-size:.9rem;opacity:.8;margin-top:var(--space-md)}.score-bar{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-md) var(--space-lg);background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--space-lg);flex-wrap:wrap}.score-item{display:flex;align-items:center;gap:var(--space-sm);font-weight:600;font-size:.95rem}.score-item .icon{font-size:1.2rem}.feedback-toast{position:fixed;top:20px;left:50%;transform:translate(-50%) translateY(-100px);padding:var(--space-md) var(--space-xl);border-radius:var(--radius-full);font-weight:700;font-size:1.1rem;z-index:1000;transition:transform var(--transition-bounce);pointer-events:none}.feedback-toast.show{transform:translate(-50%) translateY(0)}.feedback-toast.correct{background:var(--color-correct);color:#fff;box-shadow:0 4px 20px #22c55e66}.feedback-toast.incorrect{background:var(--color-incorrect);color:#fff;box-shadow:0 4px 20px #ef444466}@keyframes confetti-fall{0%{transform:translateY(-100vh) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}.confetti-piece{position:fixed;top:-10px;width:10px;height:10px;border-radius:2px;animation:confetti-fall 2s ease-in forwards;z-index:999;pointer-events:none}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.pulse{animation:pulse 2s ease-in-out infinite}@keyframes bounce-in{0%{transform:scale(.3);opacity:0}50%{transform:scale(1.05)}70%{transform:scale(.95)}to{transform:scale(1);opacity:1}}.bounce-in{animation:bounce-in .5s ease}@keyframes slide-up{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.slide-up{animation:slide-up .4s ease forwards}@keyframes fire-glow{0%,to{text-shadow:0 0 5px #ff6b35,0 0 10px #ff6b35}50%{text-shadow:0 0 15px #ff6b35,0 0 25px #fbbf24}}.streak-fire{animation:fire-glow 1s ease-in-out infinite}.empty-state{text-align:center;padding:var(--space-2xl);color:var(--color-text-secondary)}.empty-state .emoji{font-size:3rem;margin-bottom:var(--space-md)}.spinner{display:inline-block;width:24px;height:24px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.grade-1{--grade-color: #ff6b35;--grade-bg: #fff3ed}.grade-2{--grade-color: #3b82f6;--grade-bg: #eff6ff}.grade-3{--grade-color: #22c55e;--grade-bg: #f0fdf4}.grade-4{--grade-color: #8b5cf6;--grade-bg: #f5f3ff}.grade-5{--grade-color: #ec4899;--grade-bg: #fdf2f8}.grade-6{--grade-color: #f59e0b;--grade-bg: #fffbeb}@media(max-width:768px){body{overflow-x:hidden}.app-layout{flex-direction:column;min-height:100vh}.sidebar{display:none}.mobile-header,.bottom-nav{display:flex}.main-content{margin-left:0;padding:var(--space-md);padding-top:var(--space-md);padding-bottom:calc(var(--bottomnav-height) + var(--space-lg));max-width:100%;width:100%}h1{font-size:1.4rem}h2{font-size:1.15rem}.page-header h1{font-size:1.3rem}.flashcard-char{font-size:3.5rem}.flashcard-container{max-width:280px}.score-bar{gap:var(--space-sm);padding:var(--space-sm) var(--space-md);font-size:.85rem}.card{padding:var(--space-md)}.grade-selector{gap:6px}.grade-btn{padding:6px 12px;font-size:.8rem}.btn{font-size:.85rem;padding:6px 16px}.btn-lg{padding:10px 24px;font-size:1rem}.choice-btn{font-size:1rem;padding:var(--space-sm) var(--space-md)}.profile-page{padding:var(--space-md)}.profile-page h1{font-size:2rem}}@media(min-width:769px)and (max-width:1024px){.main-content{padding:var(--space-lg)}}@media(min-width:1200px){.main-content{max-width:1000px;padding:var(--space-2xl)}}.profile-page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#fff3ed,#eff6ff,#f0fdf4);padding:var(--space-xl)}.profile-page h1{font-size:2.5rem;background:linear-gradient(135deg,#ff6b35,#ec4899);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-sm)}.profile-card{background:var(--color-surface);border-radius:var(--radius-xl);padding:var(--space-lg);box-shadow:var(--shadow-md);cursor:pointer;transition:all var(--transition-bounce);text-align:center;min-width:140px;border:2px solid transparent}.profile-card:hover{transform:translateY(-8px) scale(1.02);box-shadow:var(--shadow-lg);border-color:var(--color-primary)}.profile-card .avatar{width:64px;height:64px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--color-primary),var(--color-pink));display:flex;align-items:center;justify-content:center;font-size:1.8rem;margin:0 auto var(--space-sm);color:#fff}.profile-card .name{font-family:var(--font-hindi);font-weight:700;font-size:1.1rem}.text-center{text-align:center}.text-hindi{font-family:var(--font-hindi)}.font-bold{font-weight:700}.mt-sm{margin-top:var(--space-sm)}.mt-md{margin-top:var(--space-md)}.mt-lg{margin-top:var(--space-lg)}.mb-sm{margin-bottom:var(--space-sm)}.mb-md{margin-bottom:var(--space-md)}.mb-lg{margin-bottom:var(--space-lg)}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.flex-wrap{flex-wrap:wrap}.w-full{width:100%}