@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--root-bg:#0f172a;--text-main:#f8fafc;--text-muted:#94a3b8;--primary:#8b5cf6;--primary-hover:#7c3aed;--secondary:#3b82f6;--success:#10b981;--danger:#ef4444;--warning:#f59e0b;--glass-bg:#ffffff0d;--glass-border:#ffffff1a;--glass-shadow:0 8px 32px 0 #0000005e;--card-bg:#1e293b;--card-gradient-1:#1e293bcc;--card-gradient-2:#0f172ae6;--bg-shape-1:#100f15;--bg-shape-2:#2f3e6a33;--bg-shape-3:#72274133;--btn-glass-bg:#ffffff1a;--btn-glass-border:#fff3;--btn-glass-hover:#fff3;--option-bg:#ffffff08;--option-border:#ffffff1a}[data-theme=light]{--root-bg:#f8fafc;--text-main:#0f172a;--text-muted:#475569;--glass-bg:#fff9;--glass-border:#00000014;--glass-shadow:0 8px 32px 0 #0000001a;--card-gradient-1:#ffffffe6;--card-gradient-2:#f8fafcf2;--bg-shape-1:#f4f3f6;--bg-shape-2:#cad1e866;--bg-shape-3:#ebc6d366;--btn-glass-bg:#00000008;--btn-glass-border:#0000001a;--btn-glass-hover:#00000014;--option-bg:#00000005;--option-border:#00000014}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--root-bg);background-image:radial-gradient(at 0% 0%, var(--bg-shape-1) 0, transparent 50%), radial-gradient(at 50% 0%, var(--bg-shape-2) 0, transparent 50%), radial-gradient(at 100% 0%, var(--bg-shape-3) 0, transparent 50%);color:var(--text-main);-webkit-font-smoothing:antialiased;flex-direction:column;min-height:100vh;font-family:Inter,system-ui,-apple-system,sans-serif;transition:background-color .3s,color .3s;display:flex}#root{flex-direction:column;width:100%;min-height:100vh;display:flex}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(16px);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow);border-radius:20px;transition:all .3s}.glass-panel-hover:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:0 12px 40px #0003}.btn{cursor:pointer;border:none;border-radius:12px;outline:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn:active:not(:disabled){transform:scale(.96)}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;box-shadow:0 4px 14px #8b5cf663}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #8b5cf680}.btn-glass{background:var(--btn-glass-bg);color:var(--text-main);border:1px solid var(--btn-glass-border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.btn-glass:hover:not(:disabled){background:var(--btn-glass-hover)}.btn-icon{border-radius:50%;padding:.75rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s ease-out forwards fadeIn}.file-upload-wrapper{display:inline-block;position:relative;overflow:hidden}.file-upload-wrapper input[type=file]{opacity:0;cursor:pointer;width:100%;height:100%;position:absolute;top:0;left:0}.flip-card{perspective:1000px;background-color:#0000;width:100%;max-width:600px;min-height:450px;margin:0 auto}.flip-card-inner{text-align:center;width:100%;height:100%;min-height:450px;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}.flip-card-front,.flip-card-back{backface-visibility:hidden;background:linear-gradient(145deg, var(--card-gradient-1), var(--card-gradient-2));border:1px solid var(--glass-border);width:100%;height:100%;box-shadow:var(--glass-shadow);border-radius:24px;flex-direction:column;justify-content:center;align-items:center;padding:2.5rem 2rem;display:flex;position:absolute;overflow-y:auto}.flip-card-front{justify-content:space-between}.flip-card-back{background:linear-gradient(145deg,#8b5cf61a,#3b82f61a);border-color:#8b5cf64d;transform:rotateY(180deg)}[data-theme=light] .flip-card-back{background:linear-gradient(145deg,#8b5cf60d,#3b82f60d);border-color:#8b5cf633}.option-item{background:var(--option-bg);border:1px solid var(--option-border);color:var(--text-main);border-radius:8px;padding:.8rem 1rem;font-size:.95rem;transition:all .2s}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#8b5cf64d;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#8b5cf680}.text-gradient{background:linear-gradient(90deg,#a78bfa,#3b82f6);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.animate-spin{animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}[data-theme=light] .text-gradient{background:linear-gradient(90deg,#7c3aed,#2563eb);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}@media (width<=768px){.app-main{padding:1rem!important}.app-header{flex-direction:column!important;align-items:flex-start!important;gap:1rem!important;padding:1.5rem 1rem!important}.app-header-left{flex-direction:column!important;align-items:flex-start!important;gap:.5rem!important}.app-header-left span{word-break:break-word;border-left:none!important;padding-left:0!important;font-size:.85rem!important}.app-header-right{flex-wrap:wrap!important;justify-content:flex-start!important;width:100%!important}.mode-selection-container{padding:0 .5rem;gap:1.5rem!important}.mode-card{width:100%!important;max-width:320px!important;padding:2rem 1.5rem!important}.study-title{margin-bottom:2rem!important;font-size:1.7rem!important}}.top-progress-bar{z-index:9999;background-color:#8b5cf633;width:100%;height:4px;position:fixed;top:0;left:0;overflow:hidden}.top-progress-bar:before{content:"";background-color:var(--primary);animation:2.1s cubic-bezier(.65,.815,.735,.395) infinite indeterminate-runner;position:absolute;top:0;bottom:0;left:0}@keyframes indeterminate-runner{0%{left:-35%;right:100%}60%{left:100%;right:-90%}to{left:100%;right:-90%}}