@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--bg-color:#0f111a;--surface:#1e2130;--surface-light:#2a2d40;--primary:#6366f1;--primary-hover:#4f46e5;--text-main:#f8fafc;--text-muted:#94a3b8;--border:#334155;--success:#10b981;--error:#ef4444;--radius-lg:16px;--radius-md:12px;--radius-sm:8px;--shadow-glow:0 0 20px #6366f14d;--shadow-card:0 10px 30px #00000080;--glass-bg:#1e2130b3;--glass-border:#ffffff14}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,sans-serif}body{background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:2rem 1.5rem}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.mb-8{margin-bottom:2rem}h1,h2,h3,h4{color:var(--text-main);letter-spacing:-.02em;font-weight:600}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;outline:none;font-family:inherit}.btn{border-radius:var(--radius-sm);justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);box-shadow:var(--shadow-glow)}.btn-outline{border:1px solid var(--border);color:var(--text-main);background-color:#0000}.btn-outline:hover{background-color:var(--surface-light);border-color:var(--primary)}.btn-danger{border:1px solid var(--error);color:var(--error);background-color:#0000}.btn-danger:hover{background-color:var(--error);color:#fff}.btn-icon{border-radius:var(--radius-sm);color:var(--text-muted);background:0 0;justify-content:center;align-items:center;padding:.5rem;transition:all .2s;display:flex}.btn-icon:hover{background:var(--surface-light);color:var(--text-main)}input,textarea{border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-main);background:#0003;padding:.85rem 1rem;font-family:Inter,sans-serif;font-size:1rem;transition:all .2s}input::placeholder,textarea::placeholder{color:var(--text-muted)}input:focus,textarea:focus{border-color:var(--primary);background:#0006;outline:none;box-shadow:0 0 0 2px #6366f133}nav{z-index:100;-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);background:#0f111acc;padding:1rem 0;position:sticky;top:0}.nav-container{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:0 1.5rem;display:flex}.logo{color:var(--primary);align-items:center;gap:.5rem;font-size:1.5rem;font-weight:700;display:flex}.set-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-top:2rem;display:grid}.set-card{background:var(--surface);border-radius:var(--radius-lg);border:1px solid var(--glass-border);cursor:pointer;flex-direction:column;height:100%;padding:1.5rem;transition:transform .3s cubic-bezier(.4,0,.2,1),box-shadow .3s,border-color .3s;display:flex}.set-card:hover{box-shadow:var(--shadow-glow);border-color:var(--primary);transform:translateY(-5px)}.set-card h3{margin-bottom:.5rem;font-size:1.25rem}.set-card p{color:var(--text-muted);flex-grow:1;font-size:.95rem;line-height:1.5}.set-card-footer{border-top:1px solid var(--border);color:var(--text-muted);justify-content:space-between;align-items:center;margin-top:1.5rem;padding-top:1rem;font-size:.85rem;display:flex}.set-form-header{background:var(--surface);border-radius:var(--radius-lg);border:1px solid var(--border);margin-bottom:2rem;padding:2rem}.term-row{background:var(--surface);border-radius:var(--radius-md);border:1px solid var(--border);align-items:flex-start;gap:1.5rem;margin-bottom:1rem;padding:1.5rem;transition:all .2s;display:flex}.term-row:focus-within{border-color:var(--primary);box-shadow:0 0 10px #6366f11a}.term-inputs{flex-grow:1;grid-template-columns:1fr 1fr;gap:1.5rem;display:grid}@media (width<=768px){.term-inputs{grid-template-columns:1fr;gap:1rem}.term-row{flex-direction:column}.term-actions{align-self:flex-end}}.study-area{flex-direction:column;align-items:center;padding-top:2rem;display:flex}.flashcard-container{perspective:1500px;cursor:pointer;width:100%;max-width:900px;height:550px}.flashcard-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,.2,.2,1);position:relative}.flashcard-container.flipped .flashcard-inner{transform:rotateX(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-lg);width:100%;height:100%;box-shadow:var(--shadow-card);justify-content:center;align-items:center;padding:2.5rem;font-size:2.5rem;font-weight:500;line-height:1.4;display:flex;position:absolute}.flashcard-front{background:var(--surface);border:1px solid var(--border)}.flashcard-back{background:linear-gradient(135deg, #6366f11a, var(--surface));border:1px solid var(--primary);color:var(--primary);transform:rotateX(180deg)}@media (width<=600px){.flashcard-container{height:350px}.flashcard-front,.flashcard-back{font-size:1.8rem}}.study-controls{justify-content:center;align-items:center;gap:2rem;width:100%;max-width:700px;margin-top:2.5rem;display:flex}.study-controls .btn-circle{background:var(--surface);border:1px solid var(--border);width:60px;height:60px;color:var(--text-main);border-radius:50%;justify-content:center;align-items:center;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex;box-shadow:0 4px 6px #0000004d}.study-controls .btn-circle svg{width:24px;height:24px}.study-controls .btn-circle:hover:not(:disabled){background:var(--primary);border-color:var(--primary);box-shadow:var(--shadow-glow);transform:scale(1.1)}.study-controls .btn-circle:disabled{opacity:.3;cursor:not-allowed}.card-counter{color:var(--text-muted);text-align:center;min-width:100px;font-size:1.25rem;font-weight:600}.error-banner{border:1px solid var(--error);color:var(--error);border-radius:var(--radius-sm);background:#ef44441a;align-items:center;gap:1rem;margin-bottom:2rem;padding:1rem;display:flex}