:root{--bg:#eef1f5;--panel:#fff;--ink:#1f2a37;--mute:#6b7788;--line:#dde3ea;--blue:#3b9ae1;--blue-s:#e4f1fc;--blue-d:#1f6fb2;--grey:#e6e9ee;--bad:#d64545;--ok:#2e9e6b}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 Inter,system-ui,-apple-system,Segoe UI,sans-serif}
a{color:var(--blue-d);text-decoration:none}.mute{color:var(--mute)}h1{margin:.3em 0}
.top{display:flex;justify-content:space-between;align-items:center;padding:14px 28px;background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap;gap:8px}
.brand{font-weight:700;font-size:19px;color:var(--ink);display:flex;gap:8px;align-items:center}.brand i{width:24px;height:24px;border-radius:7px;background:var(--blue)}.brand small{background:var(--blue-s);color:var(--blue-d);padding:2px 8px;border-radius:99px;font-size:11px}
.top nav{display:flex;gap:4px;flex-wrap:wrap}.top nav a{padding:7px 13px;border-radius:9px;color:var(--mute);font-weight:600}.top nav a.on,.top nav a:hover{background:var(--blue-s);color:var(--blue-d)}
.wrap{max-width:1000px;margin:auto;padding:24px 20px 60px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:16px}
.exam-tile{display:block;color:var(--ink);transition:.15s}.exam-tile:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 8px 20px #1f2a3714}.exam-tile h3{margin:0 0 4px}
.pills span{display:inline-block;background:var(--blue-s);color:var(--blue-d);border-radius:99px;padding:2px 10px;font-size:12px;margin-right:6px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:14px 0}.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px 14px}.stat b{font-size:22px;display:block}.stat span{color:var(--mute);font-size:12px}
.bp{padding:12px 0;border-bottom:1px solid var(--line)}.bp:last-child{border:0}.bp-h{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.bar{height:7px;border-radius:9px;background:var(--grey);margin:7px 0 9px;overflow:hidden}.bar span{display:block;height:100%;background:var(--blue);border-radius:9px}
.btn,button.btn{display:inline-block;border:1px solid var(--line);background:var(--panel);border-radius:11px;padding:9px 15px;font:inherit;font-weight:600;cursor:pointer;color:var(--ink)}
.btn:hover{border-color:var(--blue);color:var(--blue-d)}.btn.pri{background:var(--blue);border-color:var(--blue);color:#fff}.btn.pri:hover{filter:brightness(1.07);color:#fff}.btn.sm{padding:4px 11px;font-size:13px}.btn.del{color:var(--bad)}.btn:disabled{opacity:.4;cursor:default}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}.chip{border:1px solid var(--line);background:var(--panel);border-radius:99px;padding:5px 12px;font-size:13px;cursor:pointer;color:var(--ink)}.chip.on{background:var(--blue);color:#fff;border-color:var(--blue)}.chip em{font-style:normal;opacity:.7;margin-left:4px}
.scene{perspective:1400px;max-width:720px;margin:0 auto}.card{position:relative;height:340px;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.3,.8,.3,1);cursor:pointer}.card.flip{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--panel);border:1px solid var(--line);border-radius:22px;box-shadow:0 10px 30px #1f2a3714;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:34px 38px}
.face.back{transform:rotateY(180deg);background:linear-gradient(160deg,var(--blue-s),var(--panel))}
.tag{position:absolute;top:16px;left:18px;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--blue-d);background:var(--blue-s);padding:3px 10px;border-radius:99px}
.txt{font-size:21px;font-weight:600}.back .txt{font-size:18px;font-weight:500}.hint{position:absolute;bottom:14px;color:var(--mute);font-size:12px}
.star{position:absolute;top:12px;right:16px;font-size:22px;background:none;border:0;cursor:pointer;color:var(--mute)}.star.on{color:#f0b429}
.rate{display:flex;gap:8px;justify-content:center;margin-top:18px;flex-wrap:wrap}.rate small{display:block;font-weight:400;color:var(--mute);font-size:11px}
.nav{display:flex;justify-content:space-between;max-width:720px;margin:0 auto 12px;color:var(--mute);font-size:13px}
label{font-size:12px;color:var(--mute);font-weight:600;display:block}input,textarea,select{width:100%;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:10px;padding:9px 11px;font:inherit;margin:4px 0 12px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:12px;color:var(--mute);text-transform:uppercase}
.ok{background:#e3f5ec;color:var(--ok);padding:10px 14px;border-radius:10px;margin-bottom:14px}.err{background:#fbe8e8;color:var(--bad);padding:10px 14px;border-radius:10px;margin-bottom:14px}
pre{background:var(--bg);padding:12px;border-radius:10px;overflow:auto;font-size:13px}.pager{display:flex;gap:6px;flex-wrap:wrap}
@media(max-width:640px){.row{grid-template-columns:1fr}.card{height:380px}}
.dd{position:relative}.dd-m{display:none;position:absolute;right:0;top:100%;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 30px #1f2a3722;min-width:240px;padding:6px;z-index:9}.dd:hover .dd-m,.dd:focus-within .dd-m{display:block}.dd-m a{display:block}
.hero{background:linear-gradient(135deg,#3b9ae1,#1f6fb2);color:#fff;border-radius:22px;padding:42px 36px;margin-bottom:28px;box-shadow:0 14px 34px #3b9ae140}.hero h1{margin:0 0 8px;font-size:32px;line-height:1.2;max-width:640px}.hero p{margin:0 0 20px;opacity:.9;max-width:560px}.hero.sm{padding:28px 32px}
.hero .back{color:#dff0fd;font-size:13px;display:block;margin-bottom:10px}.hero-stats{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0}.hero-stats div{background:#ffffff26;border-radius:14px;padding:10px 18px;min-width:104px}.hero-stats b{font-size:24px;display:block}.hero-stats span{font-size:12px;opacity:.9}
.btn.white{background:#fff;color:var(--blue-d);border-color:#fff}.btn.white:hover{color:var(--blue-d);filter:brightness(.96)}
.sec-h{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin:6px 0 14px}.sec-h h2{margin:0}.sec-h input{max-width:260px;margin:0}
.exam-tile{position:relative;display:block}.ico{width:44px;height:44px;border-radius:12px;background:var(--blue-s);color:var(--blue-d);font-weight:700;display:flex;align-items:center;justify-content:center;margin-bottom:12px}.go{display:block;margin-top:12px;color:var(--blue-d);font-weight:600;font-size:14px}
.bp-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:14px}.bp-card{margin:0;display:flex;flex-direction:column}.bp-card h3{margin:10px 0 6px}.bp-card .btn{margin-top:auto;align-self:flex-start}
.bp-top{display:flex;justify-content:space-between;align-items:center}.num{font-size:28px;font-weight:700;color:var(--blue);opacity:.5}.pill{background:var(--blue-s);color:var(--blue-d);border-radius:99px;padding:2px 10px;font-size:12px;font-weight:600}
.bp-meta{display:flex;gap:14px;color:var(--mute);font-size:13px}.bp-meta b{color:var(--ink);font-size:16px}.bp-prog{font-size:12px;margin-bottom:14px}.bar .m{background:var(--ok)}
.foot{text-align:center;color:var(--mute);font-size:13px;padding:24px}
.sbtn{display:flex;gap:10px;justify-content:center;align-items:center;margin-top:18px;flex-wrap:wrap}.btn.ok2{background:var(--ok);border-color:var(--ok);color:#fff}.btn.ok2:hover{color:#fff;filter:brightness(1.07)}.btn.rv{background:#fff4e5;border-color:#f0b35a;color:#a85d00}.btn.rv:hover{color:#a85d00;filter:brightness(.97)}
.st{position:absolute;top:16px;right:18px;font-size:12px;font-weight:700;padding:3px 10px;border-radius:99px}.st.m{background:#e3f5ec;color:var(--ok)}.st.r{background:#fff4e5;color:#a85d00}
.acts{display:flex;gap:6px;flex-wrap:wrap}.acts form{margin:0}

.prio{font-size:12px;font-weight:700;padding:3px 10px;border-radius:99px}.prio.high{background:#fde8e8;color:#c13030}.prio.medium{background:#fff4e5;color:#a85d00}.prio.lower{background:var(--grey);color:var(--mute)}
.wt{background:var(--blue-s);border-radius:12px;padding:10px 14px;margin:2px 0 12px}.wt-n{display:flex;align-items:baseline;gap:8px}.wt-n b{font-size:30px;color:var(--blue-d);line-height:1}.wt-n span{color:var(--blue-d);font-size:13px}
.wt-bar{height:6px;background:#fff;border-radius:9px;margin-top:8px;overflow:hidden}.wt-bar span{display:block;height:100%;background:var(--blue);border-radius:9px}
.trapbtn{margin-top:14px;border:1px solid #f0b35a;background:#fff4e5;color:#a85d00;border-radius:99px;padding:6px 14px;font:inherit;font-size:13px;font-weight:600;cursor:pointer}
.face.back.open{justify-content:flex-start;overflow:auto;padding-top:46px}.trapbox{text-align:left;background:#fff8ee;border:1px solid #f4d9ae;border-radius:14px;padding:12px 14px;margin-top:12px;width:100%;cursor:default;font-size:14px}
.trapbox b{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:#a85d00;margin-bottom:2px}.trapbox p{margin:0 0 10px}.trapbox a{font-weight:600;word-break:break-all}

.brand .logo{height:38px;width:auto;display:block}.top nav a.login{background:var(--blue);color:#fff;margin-left:6px}.top nav a.login:hover{background:var(--blue-d);color:#fff}

/* ---- v4: spacing, wider body, light hero, footer ---- */
.top{padding:14px max(24px,calc((100% - 1240px)/2 + 28px))}
.wrap{max-width:1240px;padding:28px 28px 70px}
.hero{background:linear-gradient(135deg,#eaf4fd 0%,#f6fafe 100%);color:var(--ink);border:1px solid #d3e6f7;box-shadow:0 8px 24px #3b9ae116}
.hero h1{color:#173b5c}.hero p{color:var(--mute);opacity:1}
.hero .back{color:var(--blue-d)}
.hero-stats div{background:#fff;border:1px solid #d3e6f7;color:var(--ink)}.hero-stats b{color:var(--blue-d)}.hero-stats span{color:var(--mute);opacity:1}
.btn.white{background:var(--blue);border-color:var(--blue);color:#fff}.btn.white:hover{background:var(--blue-d);border-color:var(--blue-d);color:#fff;filter:none}
.grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.bp-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr))}
.scene,.nav{max-width:820px}
.site-foot{background:#fff;border-top:1px solid var(--line);margin-top:30px}
.sf-in{max-width:1240px;margin:auto;padding:38px 28px 22px;display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px}
.sf-in img{height:36px;width:auto;display:block;margin-bottom:12px}.sf-in p{color:var(--mute);margin:0;max-width:380px;font-size:14px}
.sf-in h4{margin:0 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink)}
.sf-in a{display:block;color:var(--mute);padding:3px 0;font-size:14px}.sf-in a:hover{color:var(--blue-d)}
.sf-bot{border-top:1px solid var(--line);max-width:1240px;margin:auto;padding:16px 28px 26px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;color:var(--mute);font-size:13px}
@media(max-width:700px){.sf-in{grid-template-columns:1fr}.wrap{padding:20px 16px 50px}.top{padding:12px 16px}.hero{padding:26px 20px}}

/* ---- v5: modern header, white body ---- */
body{background:#fff}
.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid #e8edf3;padding-top:12px;padding-bottom:12px}
.top nav{gap:2px;align-items:center}
.top nav a{position:relative;padding:8px 14px;border-radius:8px;color:#3d4b5c;font-weight:500;font-size:15px;letter-spacing:.005em;transition:color .15s,background .15s}
.top nav a:hover{background:#f1f6fb;color:var(--blue-d)}
.top nav a.on{background:transparent;color:var(--blue-d);font-weight:600}
.top nav a.on::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;background:var(--blue)}
.top nav a.login{background:var(--blue);color:#fff;font-weight:600;margin-left:12px;padding:9px 20px;border-radius:99px;box-shadow:0 2px 8px #3b9ae140}
.top nav a.login:hover{background:var(--blue-d);color:#fff;box-shadow:0 4px 12px #3b9ae155}
.top nav a.login::after{display:none}
.panel,.stat{box-shadow:0 1px 3px #1f2a3710}
.site-foot{background:#f8fafc}
@media(max-width:700px){.top nav a{padding:7px 10px;font-size:14px}.top nav a.login{margin-left:6px;padding:8px 14px}}

/* ---- reveal-answer hint as a bordered pill, like the topic chips ---- */
.hint{bottom:20px;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:99px;padding:6px 18px;font-size:13px;font-weight:500;transition:border-color .15s,color .15s,background .15s}
.card:hover .face:not(.back) .hint{border-color:var(--blue);color:var(--blue-d);background:var(--blue-s)}