:root{--bg:#f7f3fc;--bg-grad:linear-gradient(135deg, #f3ecfd 0%, #fdeef5 50%, #eaf8f1 100%);--card:#fff;--text:#3b3552;--muted:#8a84a3;--border:#e9e1f5;--lilac:#cdb4f6;--lilac-soft:#f0e8fc;--lilac-dark:#7c5cc4;--lilac-darker:#6a4bb0;--pink:#f7a8c4;--pink-soft:#fde8f0;--pink-text:#8f2f55;--green:#a6e3c7;--green-soft:#e6f7ef;--green-text:#1f6b4a;--radius:16px;--shadow:0 4px 16px #7c5cc414;--b1:#f7a8c4;--b2:#cdb4f6;--b3:#a6e3c7;--b4:#e3a8e8;--b5:#c9e8a0}*{box-sizing:border-box}body{background:var(--bg-grad) fixed;min-height:100vh;color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}h1{color:var(--lilac-darker);margin:0 0 4px;font-size:1.7rem}h2{margin:0 0 8px;font-size:1.15rem}a{color:var(--lilac-dark)}code{background:var(--lilac-soft);border-radius:6px;padding:1px 6px;font-size:.9em}.muted{color:var(--muted)}.small-text{font-size:.85rem}.center{text-align:center}.container{max-width:960px;margin:0 auto;padding:24px 16px 64px}.nav{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:10;background:#ffffffd9;flex-wrap:wrap;align-items:center;gap:24px;padding:12px 24px;display:flex;position:sticky;top:0}.brand{color:var(--lilac-darker);font-weight:700}.nav nav{flex-wrap:wrap;flex:1;gap:4px;display:flex}.nav nav a{color:var(--muted);border-radius:999px;padding:6px 14px;font-weight:500;text-decoration:none;transition:background .15s}.nav nav a:hover{background:var(--pink-soft)}.nav nav a.active{background:var(--lilac-soft);color:var(--lilac-darker)}.nav-user{align-items:center;gap:12px;display:flex}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.row{align-items:center;display:flex}.row.between{justify-content:space-between}.row.gap{gap:12px}.row.wrap{flex-wrap:wrap;gap:12px}.center-row{justify-content:center;margin-top:16px}.stack{flex-direction:column;gap:14px;display:flex}label{flex-direction:column;gap:6px;font-size:.92rem;font-weight:500;display:flex}input,textarea,select{font:inherit;border:1px solid var(--border);color:var(--text);background:#fdfbff;border-radius:10px;padding:10px 12px}input:focus,textarea:focus,select:focus{outline:2px solid var(--lilac);outline-offset:0;border-color:var(--lilac)}textarea{resize:vertical}textarea.mono,.code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.85rem}.code{background:var(--lilac-soft);border:1px solid var(--border);white-space:pre;color:var(--lilac-darker);border-radius:12px;margin:0;padding:14px 16px;overflow-x:auto}.btn{font:inherit;cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;padding:10px 18px;font-weight:600;text-decoration:none;transition:background .15s,transform .1s,opacity .15s;display:inline-flex}.btn:active:not(:disabled){transform:scale(.98)}.btn:disabled,.btn.disabled{opacity:.55;cursor:not-allowed}.btn.disabled{pointer-events:none}.btn.primary{background:var(--lilac-dark);color:#fff}.btn.primary:hover:not(:disabled){background:var(--lilac-darker)}.btn.ghost{border-color:var(--lilac);color:var(--lilac-darker);background:#fff}.btn.ghost:hover{background:var(--lilac-soft)}.btn.danger{background:var(--pink);color:var(--pink-text)}.btn.danger:hover:not(:disabled){background:#f492b4}.btn.success{background:var(--green);color:var(--green-text)}.btn.success:hover:not(:disabled){background:#8fd8b5}.btn.small{padding:5px 14px;font-size:.85rem}.btn.big{padding:14px 28px;font-size:1.05rem}.alert{border-radius:12px;padding:10px 14px;font-size:.92rem}.alert.error{background:var(--pink-soft);color:var(--pink-text);border:1px solid var(--pink)}.alert.success{background:var(--green-soft);color:var(--green-text);border:1px solid var(--green)}.auth-wrap{place-items:center;min-height:100vh;padding:16px;display:grid}.auth{flex-direction:column;gap:14px;width:100%;max-width:400px;display:flex}.auth h1{text-align:center}.auth p{margin:0}.boxes{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-top:24px;display:grid}.box{color:inherit;border-top:6px solid var(--lilac);text-decoration:none;transition:transform .15s,box-shadow .15s}.box:hover{transform:translateY(-3px);box-shadow:0 8px 22px #7c5cc424}.box-1{border-top-color:var(--b1)}.box-2{border-top-color:var(--b2)}.box-3{border-top-color:var(--b3)}.box-4{border-top-color:var(--b4)}.box-5{border-top-color:var(--b5)}.box-title{font-size:1.1rem;font-weight:700}.box-count{color:var(--lilac-darker);margin:8px 0;font-size:2.6rem;font-weight:800}.badge{background:var(--green-soft);color:var(--green-text);border-radius:999px;padding:2px 12px;font-size:.78rem;font-weight:600;display:inline-block}.badge.due{background:var(--pink-soft);color:var(--pink-text)}.box-badge{color:var(--text)}.box-badge.box-1{background:var(--b1)}.box-badge.box-2{background:var(--b2)}.box-badge.box-3{background:var(--b3)}.box-badge.box-4{background:var(--b4)}.box-badge.box-5{background:var(--b5)}.q-text{white-space:pre-wrap;margin:10px 0 4px;font-weight:600}.a-text{color:var(--muted);white-space:pre-wrap;margin:0 0 12px}.progress{background:var(--lilac-soft);border-radius:999px;height:8px;margin:8px 0 24px;overflow:hidden}.progress>div{background:linear-gradient(90deg, var(--pink), var(--lilac), var(--green));height:100%;transition:width .3s}.flashcard-wrap{perspective:1200px;margin-bottom:8px}.flashcard{min-height:280px;transform-style:preserve-3d;transition:transform .5s;position:relative}.flashcard.flipped{transform:rotateY(180deg)}.face{backface-visibility:hidden;background:var(--pink-soft);border:1px solid var(--pink);text-align:center;border-radius:20px;flex-direction:column;justify-content:center;align-items:center;padding:24px;display:flex;position:absolute;inset:0;overflow:auto;box-shadow:0 10px 28px #7c5cc424}.face .badge{position:absolute;top:16px;left:16px}.face.back{background:var(--green-soft);border-color:var(--green);transform:rotateY(180deg)}.flash-label{text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0;font-size:.75rem}.flash-text{white-space:pre-wrap;word-break:break-word;margin:8px 0 0;font-size:1.4rem;font-weight:600}@media (width<=600px){.nav{gap:12px;padding:10px 12px}.flash-text{font-size:1.15rem}}