@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap";:root{--font-primary:"Inter", sans-serif;--font-title:"Outfit", sans-serif;--bg-app:#080a10;--bg-sidebar:#0d111cd9;--bg-card:#161c2d99;--bg-card-hover:#1e263ccc;--border-glass:#ffffff14;--border-focus:#6366f166;--color-primary:#6366f1;--color-primary-hover:#4f46e5;--color-secondary:#0ea5e9;--color-success:#10b981;--color-warning:#f59e0b;--color-danger:#ef4444;--text-main:#f3f4f6;--text-muted:#9ca3af;--text-inverse:#0b0f19;--shadow-sm:0 2px 8px #00000026;--shadow-md:0 8px 32px #0000004d;--shadow-lg:0 12px 48px #00000073;--shadow-primary:0 0 15px #6366f159;--radius-sm:8px;--radius-md:16px;--radius-lg:24px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-app);color:var(--text-main);font-family:var(--font-primary);min-height:100vh;overflow-x:hidden}.app-container{background-image:radial-gradient(circle at 10% 20%,#6366f11a 0%,#0000 40%),radial-gradient(circle at 90% 80%,#0ea5e914 0%,#0000 40%),radial-gradient(circle,#10b98108 0%,#0000 50%);background-attachment:fixed;min-height:100vh;display:flex}.glass-panel{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-glass);border-radius:var(--radius-md);box-shadow:var(--shadow-md)}.glass-panel-interactive{composes:glass-panel;transition:all .3s cubic-bezier(.4,0,.2,1)}.glass-panel-interactive:hover{background:var(--bg-card-hover);box-shadow:var(--shadow-lg);border-color:#ffffff26;transform:translateY(-4px)}h1,h2,h3,h4,h5,h6{font-family:var(--font-title);letter-spacing:-.02em;font-weight:600}.sidebar{background:var(--bg-sidebar);-webkit-backdrop-filter:blur(16px);border-right:1px solid var(--border-glass);z-index:100;flex-direction:column;flex-shrink:0;width:280px;height:100vh;padding:24px;display:flex;position:sticky;top:0}.sidebar-logo{font-family:var(--font-title);background:linear-gradient(135deg, var(--text-main) 30%, var(--color-primary) 60%, var(--color-secondary) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;align-items:center;gap:12px;margin-bottom:36px;font-size:24px;font-weight:800;display:flex}.sidebar-nav{flex-direction:column;flex-grow:1;gap:8px;display:flex}.sidebar-link{border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;text-align:left;background:0 0;border:1px solid #0000;align-items:center;gap:12px;padding:12px 16px;font-size:15px;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.sidebar-link:hover{color:var(--text-main);background:#ffffff0d}.sidebar-link.active{color:var(--text-main);background:#6366f126;border:1px solid #6366f140;box-shadow:0 0 10px #6366f11a}.sidebar-footer{border-top:1px solid var(--border-glass);color:var(--text-muted);flex-direction:column;gap:8px;margin-top:auto;padding-top:16px;font-size:13px;display:flex}.main-content{flex-grow:1;width:calc(100% - 280px);max-width:1200px;margin:0 auto;padding:40px}.flashcard-wrapper{perspective:1200px;cursor:pointer;width:100%;max-width:500px;height:440px;margin:24px auto}.flashcard-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flashcard-wrapper.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-lg);width:100%;height:100%;box-shadow:var(--shadow-md);border:1px solid var(--border-glass);flex-direction:column;justify-content:center;align-items:center;padding:36px;display:flex;position:absolute;top:0;left:0}.flashcard-front{background:linear-gradient(135deg,#1a2035cc 0%,#0f1224e6 100%)}.flashcard-back{background:linear-gradient(135deg,#14233ccc 0%,#0a0f1ee6 100%);transform:rotateY(180deg)}.btn{font-family:var(--font-primary);border-radius:var(--radius-sm);cursor:pointer;border:1px solid #0000;outline:none;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background:var(--color-primary);color:var(--text-main);box-shadow:var(--shadow-primary)}.btn-primary:hover{background:var(--color-primary-hover);transform:translateY(-1px)}.btn-secondary{border-color:var(--border-glass);color:var(--text-main);background:#ffffff12}.btn-secondary:hover{background:#ffffff1f}.btn-success{color:#34d399;background:#10b98126;border-color:#10b98140}.btn-success:hover{background:#10b98140}.matching-grid{grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px;display:grid}.matching-card{text-align:center;border-radius:var(--radius-md);cursor:pointer;border:1px solid var(--border-glass);-webkit-user-select:none;user-select:none;background:#161c2d80;justify-content:center;align-items:center;height:110px;padding:12px;font-size:14px;font-weight:500;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex}.matching-card:hover{background:#1e263cb3;border-color:#ffffff26;transform:scale(1.02)}.matching-card.selected{border-color:var(--color-primary);color:#a5b4fc;background:#6366f140;box-shadow:0 0 12px #6366f133}.matching-card.matched{color:#6ee7b7;opacity:.5;cursor:default;pointer-events:none;background:#10b98126;border-color:#10b98166}.progress-bar-container{background:#ffffff0d;border-radius:4px;width:100%;height:8px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);border-radius:4px;height:100%;transition:width .4s}@keyframes success-pop{0%{transform:scale(1)}50%{border-color:var(--color-success);transform:scale(1.08)}to{transform:scale(1)}}.success-animation{animation:.4s ease-out success-pop}@keyframes error-shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.error-animation{animation:.3s ease-in-out error-shake}@media (width<=1024px){.sidebar{width:240px;padding:16px}.main-content{width:calc(100% - 240px);padding:24px}}@media (width<=768px){.app-container{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border-glass);width:100%;height:auto;padding:16px;position:relative}.sidebar-logo{margin-bottom:16px}.sidebar-nav{flex-direction:row;gap:4px;padding-bottom:8px;overflow-x:auto}.sidebar-link{white-space:nowrap;padding:8px 12px}.sidebar-footer{display:none}.main-content{width:100%;padding:16px}.matching-grid{grid-template-columns:repeat(2,1fr)}}