:root{--bg:#f4f7fb;--card:#fff;--text:#172033;--muted:#667085;--primary:#246bfe;--primary2:#00b894;--warn:#ffb020;--danger:#ef4444;--line:#e6ecf5;--soft:#eef5ff;--purple:#7c3aed;--shadow:0 18px 45px rgba(20,35,70,.09);--r:22px}*{box-sizing:border-box}body{margin:0;font-family:Tahoma,Arial,sans-serif;background:linear-gradient(135deg,#f4f7fb,#eef6ff);color:var(--text)}button,input,select,textarea{font-family:inherit}button{border:0;border-radius:14px;padding:10px 14px;background:var(--primary);color:white;cursor:pointer;font-weight:700;box-shadow:0 8px 18px #246bfe24}button.ghost{background:#fff;color:var(--primary);border:1px solid #cfe0ff;box-shadow:none}button.danger{background:var(--danger)}button.green{background:var(--primary2)}button.warn{background:var(--warn);color:#1f2937}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:11px 13px;outline:0;color:var(--text)}textarea{min-height:100px}.login{min-height:100vh;display:grid;place-items:center;padding:18px}.login-card{width:min(460px,100%);background:var(--card);padding:28px;border-radius:30px;box-shadow:var(--shadow);border:1px solid #fff}.brand{display:flex;gap:14px;align-items:center;margin-bottom:20px}.logo{width:54px;height:54px;border-radius:18px;background:linear-gradient(135deg,var(--primary),var(--purple));display:grid;place-items:center;color:white;font-size:26px}.muted{color:var(--muted);font-size:13px}.layout{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{background:rgba(255,255,255,.8);backdrop-filter:blur(16px);border-left:1px solid var(--line);padding:20px;position:sticky;top:0;height:100vh}.main{padding:22px 28px 90px}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.chip{display:inline-flex;align-items:center;gap:6px;background:var(--soft);color:#1d4ed8;border-radius:999px;padding:6px 10px;font-size:12px;font-weight:700}.menu{display:flex;flex-direction:column;gap:8px;margin-top:18px}.menu button{background:transparent;color:var(--text);box-shadow:none;text-align:right;border-radius:16px;display:flex;align-items:center;gap:10px;padding:12px}.menu button.active,.menu button:hover{background:var(--soft);color:var(--primary)}.top-actions{display:flex;gap:10px;flex-wrap:wrap}.grid{display:grid;gap:16px}.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--card);border:1px solid rgba(255,255,255,.8);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}.stat{position:relative;overflow:hidden}.stat b{display:block;font-size:28px;margin-top:8px}.stat:after{content:"";position:absolute;left:-30px;bottom:-30px;width:90px;height:90px;border-radius:50%;background:rgba(36,107,254,.08)}.row{display:grid;grid-template-columns:repeat(12,1fr);gap:12px;align-items:end}.col-2{grid-column:span 2}.col-3{grid-column:span 3}.col-4{grid-column:span 4}.col-5{grid-column:span 5}.col-6{grid-column:span 6}.col-8{grid-column:span 8}.col-12{grid-column:span 12}.table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line)}table{width:100%;border-collapse:collapse;background:white;min-width:760px}th,td{padding:12px;border-bottom:1px solid var(--line);text-align:right;font-size:13px}th{background:#f8fbff;color:#344054;font-weight:800}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.tabs button{background:#fff;color:var(--text);border:1px solid var(--line);box-shadow:none}.tabs button.active{background:var(--primary);color:white}.alert{padding:12px 14px;border-radius:16px;background:#fff7e8;border:1px solid #ffe0a6;color:#8a5700;margin:12px 0}.success{background:#ecfff7;border-color:#a7f3d0;color:#047857}.error{background:#fff1f2;border-color:#fecdd3;color:#be123c}.session-card{display:grid;grid-template-columns:1.2fr 1fr;gap:14px}.status{border-radius:999px;padding:5px 9px;font-size:12px;font-weight:800}.status.ok{background:#dcfce7;color:#15803d}.status.lock{background:#f1f5f9;color:#475569}.status.end{background:#fee2e2;color:#b91c1c}.progress{height:10px;background:#e9eef7;border-radius:99px;overflow:hidden}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary2));border-radius:99px}.chart{height:190px;display:flex;align-items:end;gap:9px;padding:12px;background:#f9fbff;border-radius:18px;border:1px solid var(--line)}.bar{flex:1;border-radius:12px 12px 6px 6px;background:linear-gradient(180deg,var(--primary),#8eb5ff);min-height:10px;position:relative}.bar span{position:absolute;top:-24px;left:50%;transform:translateX(-50%);font-size:11px;color:var(--muted)}.class-card{cursor:pointer;border:2px solid transparent}.class-card.active{border-color:var(--primary);background:#f5f9ff}.mobile-nav{display:none}.pill-list{display:flex;gap:8px;flex-wrap:wrap}.pill{background:#f2f4f7;border:1px solid #e4e7ec;padding:7px 10px;border-radius:999px;font-size:12px}.exam-page{max-width:880px;margin:auto}.question{background:white;border:1px solid var(--line);border-radius:20px;padding:16px;margin:12px 0}.option{display:block;background:#f8fafc;border:1px solid var(--line);border-radius:14px;padding:10px;margin:8px 0}.hidden{display:none!important}@media(max-width:900px){.layout{grid-template-columns:1fr}.sidebar{display:none}.main{padding:16px 14px 92px}.grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}.row{grid-template-columns:1fr}.col-2,.col-3,.col-4,.col-5,.col-6,.col-8,.col-12{grid-column:span 1}.session-card{grid-template-columns:1fr}.mobile-nav{display:flex;position:fixed;bottom:0;right:0;left:0;background:rgba(255,255,255,.95);border-top:1px solid var(--line);padding:8px;z-index:10;gap:6px;overflow:auto}.mobile-nav button{background:#fff;color:var(--text);border:1px solid var(--line);box-shadow:none;white-space:nowrap;padding:9px 11px}.panel-title{align-items:flex-start;flex-direction:column}.card{border-radius:18px}}

/* v6 professional empty states and exam UI */
.empty-state{background:linear-gradient(135deg,#f8fbff,#eefbf8);border:1px dashed #b8dbe2;border-radius:24px;padding:26px;line-height:2;color:#425466;font-weight:800;text-align:center}
.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.exam-pro{min-height:100vh;background:radial-gradient(circle at 12% 15%,rgba(255,213,79,.35),transparent 24rem),radial-gradient(circle at 90% 7%,rgba(19,211,170,.32),transparent 24rem),linear-gradient(135deg,#0b1324 0%,#102a43 35%,#0b7285 100%);padding:24px;color:#102033;direction:rtl}.exam-top{max-width:1120px;margin:auto auto 18px;display:flex;justify-content:space-between;gap:14px;align-items:center;color:#fff}.brand-mini{display:flex;align-items:center;gap:14px}.brand-mini>b{width:56px;height:56px;border-radius:20px;background:linear-gradient(145deg,#ffd43b,#12b886);display:grid;place-items:center;color:#08233c;font-size:28px;box-shadow:0 14px 30px #0004}.brand-mini h2{margin:0;font-size:clamp(18px,3vw,30px);font-weight:950}.brand-mini p{margin:4px 0;color:#ffffffe0}.timer-pro{min-width:128px;text-align:center;padding:12px 18px;border-radius:999px;background:#ffffff24;border:1px solid #ffffff44;backdrop-filter:blur(12px);font-weight:950;font-size:20px}.timer-pro.warning{background:#f59f0040}.timer-pro.danger{background:#e0313140;animation:pulse 1s infinite}@keyframes pulse{50%{transform:scale(1.03)}}.exam-shell{max-width:1120px;margin:0 auto;background:rgba(255,255,255,.93);border:1px solid rgba(255,255,255,.7);border-radius:30px;padding:clamp(18px,3vw,34px);box-shadow:0 24px 70px rgba(6,22,38,.28);backdrop-filter:blur(18px)}.exam-meta{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#405065;font-weight:900;margin-bottom:12px}.progress-pro{height:14px;background:#e9f2f4;border-radius:999px;overflow:hidden;margin-bottom:20px}.progress-pro>div{height:100%;width:0;background:linear-gradient(90deg,#12b886,#ffd43b,#ff922b);transition:.25s}.question-pro-card{background:#fff;border:1px solid #e5edf3;border-radius:28px;padding:clamp(18px,3vw,32px);box-shadow:0 18px 45px rgba(15,48,73,.08)}.q-pro-head{display:flex;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}.q-pro-head span,.q-pro-head small{display:inline-flex;background:#e6fcf5;color:#087f5b;border:1px solid #c3fae8;border-radius:999px;padding:8px 12px;font-weight:950}.q-pro-head small{background:#fff9db;color:#e67700;border-color:#ffec99}.question-pro-card h3{font-size:clamp(20px,2.5vw,29px);line-height:1.9;margin:0 0 16px;font-weight:950;color:#172033}.question-media-pro{background:linear-gradient(135deg,#f8fbff,#eefbf8);border:1px dashed #cde2e6;border-radius:24px;padding:18px;margin:12px 0 18px;overflow-x:auto}.question-media-pro svg{max-width:100%;height:auto;display:block;margin:auto}.answers-pro{display:grid;grid-template-columns:1fr 1fr;gap:13px}.answer-card{position:relative;border:2px solid #e4edf3;background:#fbfdff;border-radius:20px;padding:16px 56px 16px 16px;min-height:64px;display:flex;align-items:center;text-align:right;font-weight:900;line-height:1.7;transition:.15s;color:#102033}.answer-card:hover{border-color:#9bd7df;transform:translateY(-1px);box-shadow:0 10px 25px rgba(11,114,133,.08)}.answer-card span{position:absolute;right:14px;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:11px;background:#e7f5ff;color:#0b7285;display:grid;place-items:center;font-size:13px;font-weight:950}.answer-card.selected{border-color:#0b7285;background:#e3fafc;box-shadow:0 16px 34px rgba(11,114,133,.14)}.answer-card.selected span{background:#0b7285;color:#fff}.exam-nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:22px}.exam-nav button[disabled]{opacity:.45;cursor:not-allowed}.danger{background:#fff5f5!important;color:#e03131!important;border:1px solid #ffc9c9!important}@media(max-width:820px){.exam-pro{padding:12px}.exam-top{align-items:flex-start;flex-direction:column}.timer-pro{width:100%}.answers-pro{grid-template-columns:1fr}.exam-nav button{flex:1}.exam-meta{font-size:13px}}

/* v7 — signed numbers interactive PhET-like session */
.soft-card{background:linear-gradient(135deg,#f8fbff,#eefbf8);border:1px solid #d9eef2}
.signed-lab{margin-top:18px;display:grid;gap:18px}
.lab-hero{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px;border-radius:24px;background:linear-gradient(135deg,#0b7285,#12b886);color:#fff;box-shadow:0 18px 42px rgba(11,114,133,.22)}
.lab-hero h3{margin:0 0 8px;font-size:24px}.lab-hero p{margin:0;line-height:2;color:rgba(255,255,255,.9)}
.lab-score{min-width:110px;text-align:center;padding:12px 16px;border-radius:18px;background:rgba(255,255,255,.18);font-weight:950}
.stepper{display:flex;gap:8px;overflow:auto;padding:8px 0}.stepper span{white-space:nowrap;border-radius:999px;padding:8px 12px;background:#eef8f8;color:#0b7285;font-weight:900;border:1px solid #d1eeee}
.sim-card{background:#fff;border:1px solid #e5edf3;border-radius:24px;padding:18px;box-shadow:0 12px 30px rgba(15,48,73,.07)}
.sim-card h3{margin-top:0}.scenario-card{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px solid #e3edf3;background:#fbfdff;border-radius:16px;padding:12px;margin:8px 0;font-weight:850}
.scenario-card select,.scenario-card input{max-width:170px;border:1px solid #d8e6ee;border-radius:12px;padding:8px;font:inherit}
.hint-box{margin-top:10px;border-radius:16px;background:#fff9db;color:#8a5a00;padding:11px;line-height:1.9;font-weight:850;min-height:44px}
.range{width:100%;accent-color:#0b7285}.number-line{height:78px;border-radius:22px;background:linear-gradient(90deg,#fff0f0 0 48%,#f1f3f5 48% 52%,#e6fcf5 52%);display:flex;align-items:center;justify-content:space-between;padding:0 18px;margin:12px 0;font-weight:950}.number-line b{font-size:34px;color:#0b7285;background:white;border:4px solid #0b7285;border-radius:18px;padding:8px 18px}
.thermo{height:30px;background:linear-gradient(90deg,#74c0fc,#f1f3f5,#ff922b);border-radius:999px;overflow:hidden;border:1px solid #d6e4ea;margin:12px 0}.thermo div{height:100%;width:50%;background:rgba(255,255,255,.45);border-left:3px solid #102a43}
.sea-world{position:relative;height:230px;border-radius:22px;overflow:hidden;border:1px solid #dbe8ee;margin:12px 0}.sky{height:50%;background:linear-gradient(#d0ebff,#e7f5ff);display:grid;place-items:center;color:#0b7285;font-weight:950}.water{height:50%;background:linear-gradient(#a5d8ff,#1971c2);display:grid;place-items:center;color:white;font-weight:950}.sea-zero{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);height:4px;background:#ffd43b;z-index:2;text-align:center;color:#8a5a00;font-weight:950}.sub{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);font-size:38px;transition:.25s ease;z-index:3}
@media(max-width:760px){.lab-hero{flex-direction:column;align-items:flex-start}.scenario-card{flex-direction:column;align-items:stretch}.scenario-card select,.scenario-card input{max-width:none;width:100%}.sim-card{padding:14px}.number-line b{font-size:26px}.stepper{padding-bottom:12px}}

/* ===================== V8 Professional Signed Numbers Lab ===================== */
.signed-v8{--pos:#0ea5a4;--pos2:#14b8a6;--neg:#f97316;--neg2:#ef4444;--zero:#f59e0b;--ink:#0f172a;--muted:#64748b;--panel:#ffffff;--line:#e2e8f0;direction:rtl;font-family:inherit;margin-top:18px}
.signed-v8 *{box-sizing:border-box}.v8-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:stretch;border-radius:32px;padding:22px;background:radial-gradient(circle at 8% 5%,rgba(20,184,166,.20),transparent 360px),linear-gradient(135deg,#ecfeff,#fff7ed);border:1px solid #ccfbf1;box-shadow:0 22px 55px rgba(15,23,42,.08);overflow:hidden}.v8-hero h2{margin:0 0 10px;font-size:clamp(22px,3vw,34px);font-weight:950;color:#0f172a}.v8-hero p{line-height:2;margin:0;color:#475569;font-weight:750}.v8-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.v8-badge{padding:8px 12px;border-radius:999px;background:white;border:1px solid #dbeafe;color:#075985;font-weight:900;font-size:12px}.v8-scorebox{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.v8-scorebox div{background:rgba(255,255,255,.8);border:1px solid #dbeafe;border-radius:22px;padding:16px;text-align:center}.v8-scorebox b{display:block;font-size:24px;color:#0f766e}.v8-stage-tabs{display:flex;gap:10px;overflow-x:auto;padding:14px 0;margin-top:10px}.v8-tab{border:1px solid #dbeafe;background:#fff;border-radius:999px;padding:10px 14px;font-weight:950;color:#334155;white-space:nowrap;cursor:pointer}.v8-tab.active{background:linear-gradient(135deg,#0ea5a4,#22c55e);color:white;border-color:transparent;box-shadow:0 10px 24px rgba(14,165,164,.22)}.v8-stage{display:none}.v8-stage.active{display:block}.v8-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.v8-card{background:#fff;border:1px solid #e2e8f0;border-radius:28px;padding:18px;box-shadow:0 16px 40px rgba(15,23,42,.06)}.v8-card h3{margin:0 0 10px;font-size:20px;color:#0f172a;font-weight:950}.v8-card p{line-height:2;color:#475569;font-weight:750}.v8-discovery{background:linear-gradient(135deg,#f0fdfa,#fff7ed);border:1px dashed #5eead4;border-radius:22px;padding:14px;margin:12px 0;color:#164e63;font-weight:850}.v8-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.v8-drop{min-height:160px;border:2px dashed #cbd5e1;border-radius:22px;padding:10px;background:#f8fafc}.v8-drop[data-type="positive"]{background:#ecfdf5}.v8-drop[data-type="negative"]{background:#fff7ed}.v8-drop[data-type="zero"]{background:#fffbeb}.v8-drop h4{margin:0 0 8px;text-align:center}.v8-chip-card{display:flex;align-items:center;justify-content:space-between;gap:10px;background:white;border:1px solid #e2e8f0;border-radius:18px;padding:10px;margin:8px 0;font-weight:900;box-shadow:0 8px 20px rgba(15,23,42,.05);cursor:pointer}.v8-chip-card.selected{outline:3px solid #14b8a6}.v8-select{width:100%;border:1px solid #cbd5e1;border-radius:14px;padding:10px;font-weight:900;background:#fff}.v8-range{width:100%;accent-color:#0ea5a4}.v8-axis-wrap{padding:18px 10px}.v8-axis{position:relative;height:92px;margin:20px 0;background:linear-gradient(90deg,rgba(239,68,68,.14) 0 50%,rgba(20,184,166,.14) 50% 100%);border-radius:22px;border:1px solid #e2e8f0}.v8-axis-line{position:absolute;left:5%;right:5%;top:48%;height:5px;background:#334155;border-radius:5px}.v8-tick{position:absolute;top:54%;transform:translateX(-50%);font-size:11px;color:#475569;font-weight:900}.v8-zero{position:absolute;left:50%;top:0;bottom:0;border-right:3px solid #f59e0b}.v8-token{position:absolute;top:22px;transform:translateX(-50%);width:48px;height:48px;border-radius:18px;background:linear-gradient(135deg,#f59e0b,#f97316);display:grid;place-items:center;color:white;font-size:22px;font-weight:950;box-shadow:0 15px 30px rgba(249,115,22,.24);transition:.18s}.v8-rule-input{display:flex;gap:8px;align-items:center;margin-top:12px}.v8-rule-input input{flex:1;border:1px solid #cbd5e1;border-radius:16px;padding:12px;font-weight:900}.v8-mini-btns{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.v8-btn{border:0;border-radius:16px;background:linear-gradient(135deg,#0ea5a4,#22c55e);color:white;font-weight:950;padding:12px 16px;cursor:pointer}.v8-btn.secondary{background:#f1f5f9;color:#0f172a;border:1px solid #e2e8f0}.v8-btn.warn{background:linear-gradient(135deg,#f97316,#ef4444)}.v8-feedback{border-radius:18px;padding:12px;margin-top:12px;background:#f8fafc;border:1px solid #e2e8f0;line-height:2;color:#334155;font-weight:850}.v8-feedback.good{background:#ecfdf5;border-color:#86efac;color:#166534}.v8-feedback.bad{background:#fff7ed;border-color:#fdba74;color:#9a3412}.v8-thermo-wrap{display:grid;grid-template-columns:90px 1fr;gap:18px;align-items:center}.v8-thermo{width:62px;height:260px;border-radius:999px;background:#e2e8f0;border:6px solid white;box-shadow:inset 0 0 0 1px #cbd5e1,0 14px 25px rgba(15,23,42,.08);position:relative;margin:auto;overflow:hidden}.v8-thermo-fill{position:absolute;left:0;right:0;bottom:0;height:50%;background:linear-gradient(0deg,#38bdf8,#ef4444);border-radius:999px}.v8-thermo-zero{position:absolute;left:0;right:0;bottom:50%;height:3px;background:#f59e0b;z-index:2}.v8-temp-number{font-size:42px;font-weight:950;text-align:center;color:#0f766e}.v8-sea{height:300px;border-radius:26px;overflow:hidden;border:1px solid #bae6fd;position:relative;background:linear-gradient(#dbeafe 0 48%,#0ea5e9 48% 52%,#164e63 52% 100%)}.v8-sea:before{content:'سطح دریا = ۰';position:absolute;left:12px;right:12px;top:48%;transform:translateY(-50%);background:rgba(255,255,255,.85);border-radius:999px;text-align:center;font-weight:950;color:#075985;padding:6px}.v8-object{position:absolute;left:50%;transform:translate(-50%,-50%);font-size:38px;transition:.18s;filter:drop-shadow(0 10px 20px rgba(0,0,0,.22))}.v8-plot{height:180px;border-radius:22px;background:linear-gradient(#fff,#f8fafc);border:1px solid #e2e8f0;position:relative;overflow:hidden}.v8-plot svg{width:100%;height:100%}.v8-plot-note{font-size:12px;color:#64748b;line-height:1.8}.v8-mission-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.v8-mission{background:#fff;border:1px solid #e2e8f0;border-radius:20px;padding:12px}.v8-mission b{display:block;line-height:1.8}.v8-options{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}.v8-option{border:1px solid #cbd5e1;background:#f8fafc;border-radius:14px;padding:9px;font-weight:950;cursor:pointer}.v8-option.ok{background:#dcfce7;border-color:#86efac;color:#166534}.v8-option.no{background:#fee2e2;border-color:#fca5a5;color:#991b1b}.v8-practice-q{border:1px solid #e2e8f0;background:#fff;border-radius:22px;padding:14px;margin:10px 0}.v8-practice-q strong{display:block;line-height:1.9}.v8-practice-q input{width:100%;border:1px solid #cbd5e1;border-radius:14px;padding:10px;margin-top:8px;font-weight:900}.v8-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.v8-summary .box{border-radius:20px;background:#f8fafc;border:1px solid #e2e8f0;padding:14px;text-align:center}.v8-summary .box b{display:block;font-size:22px;color:#0f766e}.v8-medals{display:flex;gap:10px;flex-wrap:wrap}.v8-medal{padding:10px 14px;background:#fff7ed;border:1px solid #fdba74;color:#9a3412;border-radius:999px;font-weight:950}.v8-exam-route{border-radius:28px;padding:18px;background:linear-gradient(135deg,#eef2ff,#ecfeff);border:1px solid #c7d2fe;margin-top:16px}.v8-step-card{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;background:white;border:1px solid #e2e8f0;border-radius:22px;padding:14px;margin:10px 0}.v8-step-card .num{width:40px;height:40px;border-radius:16px;display:grid;place-items:center;background:#0ea5a4;color:white;font-weight:950}.v8-step-card h4{margin:0;color:#0f172a;font-weight:950}.v8-step-card p{margin:4px 0 0;color:#64748b;line-height:1.9}.v8-table{width:100%;border-collapse:separate;border-spacing:0 8px}.v8-table td,.v8-table th{padding:10px;background:#fff;border-top:1px solid #e2e8f0;border-bottom:1px solid #e2e8f0}.v8-table td:first-child,.v8-table th:first-child{border-radius:0 14px 14px 0;border-right:1px solid #e2e8f0}.v8-table td:last-child,.v8-table th:last-child{border-radius:14px 0 0 14px;border-left:1px solid #e2e8f0}.v8-mobile-hint{display:none}
@media(max-width:860px){.v8-hero,.v8-grid,.v8-columns,.v8-thermo-wrap,.v8-mission-grid{grid-template-columns:1fr}.v8-scorebox,.v8-summary{grid-template-columns:repeat(2,1fr)}.v8-options{grid-template-columns:repeat(2,1fr)}.v8-mobile-hint{display:block;background:#fef3c7;border:1px solid #fbbf24;border-radius:18px;padding:10px;margin:10px 0;color:#92400e;font-weight:850}.v8-stage-tabs{position:sticky;top:0;background:#fff;z-index:5;border-radius:0 0 18px 18px}.v8-hero{padding:16px}.v8-card{padding:14px}}

/* v9 report and access fixes */
.exam-report-card{background:#fff;border:1px solid #e6edf4;border-radius:26px;padding:20px;margin:18px 0;box-shadow:0 18px 44px rgba(15,48,73,.08)}
.exam-report-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;border-bottom:1px solid #e6edf4;padding-bottom:12px;margin-bottom:14px}
.exam-report-head h3{margin:0 0 6px;font-size:22px}.exam-report-head p{margin:0;color:#667085;line-height:1.8}.exam-key{direction:ltr;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:999px;padding:8px 11px;font-size:12px;color:#475569;white-space:nowrap}
.exam-deltas{background:#f8fafc;border:1px dashed #cbd5e1;border-radius:18px;padding:12px;margin:14px 0;line-height:2}.delta{display:inline-flex;padding:3px 9px;border-radius:999px;font-weight:900}.delta.up{background:#dcfce7;color:#166534}.delta.down{background:#fee2e2;color:#991b1b}.delta.neutral{background:#f1f5f9;color:#475569}
.mini-bars{height:160px;display:flex;align-items:flex-end;gap:9px;overflow-x:auto;padding:8px}.mini-bar{min-width:54px;text-align:center;font-size:11px;color:#64748b}.mini-bar div{width:30px;margin:0 auto 6px;border-radius:10px 10px 0 0;background:linear-gradient(180deg,#14b8a6,#0f766e)}.mini-bar b{display:block;color:#0f766e}.mini-bar span{display:block;white-space:nowrap;max-width:70px;overflow:hidden;text-overflow:ellipsis}
details{background:#fff;border:1px solid #e6edf4;border-radius:18px;margin-top:12px;padding:10px}summary{cursor:pointer;font-weight:950;color:#0f766e}
@media(max-width:760px){.exam-report-head{flex-direction:column}.exam-key{white-space:normal}.mini-bars{height:145px}}

/* =========================================================
   V10 — Teacher Session Studio
   ========================================================= */
.v10-session-page{display:grid;gap:18px}
.v10-session-hero{position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(300px,.7fr);gap:24px;align-items:center;padding:28px;border-radius:28px;background:linear-gradient(135deg,#0f172a 0%,#123c69 50%,#0f766e 100%);color:#fff;box-shadow:0 24px 60px rgba(15,23,42,.22)}
.v10-session-hero:before,.v10-session-hero:after{content:"";position:absolute;border-radius:50%;pointer-events:none}.v10-session-hero:before{width:260px;height:260px;left:-80px;top:-120px;background:rgba(56,189,248,.18)}.v10-session-hero:after{width:210px;height:210px;right:34%;bottom:-150px;background:rgba(251,191,36,.16)}
.v10-session-hero>div{position:relative;z-index:1}.v10-session-hero h2{font-size:clamp(27px,3vw,42px);margin:8px 0 10px}.v10-session-hero p{margin:0;color:rgba(255,255,255,.82);line-height:2}.v10-kicker{display:inline-flex;padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);font-size:12px;font-weight:900}
.v10-hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px}.v10-hero-stats div{padding:16px;border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.09);border-radius:18px;backdrop-filter:blur(10px)}.v10-hero-stats b{display:block;font-size:26px}.v10-hero-stats span{font-size:12px;color:rgba(255,255,255,.76)}
.v10-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 16px}.v10-toolbar-main{display:grid;grid-template-columns:minmax(180px,.8fr) minmax(220px,1.5fr) minmax(160px,.7fr);gap:10px;flex:1}.v10-toolbar select,.v10-toolbar input{margin:0}
.v10-primary,.v10-soft{border:0;border-radius:14px;padding:11px 16px;font-weight:900;cursor:pointer;transition:.18s}.v10-primary{background:linear-gradient(135deg,#0f766e,#14b8a6);color:white;box-shadow:0 10px 24px rgba(15,118,110,.22)}.v10-primary:hover,.v10-soft:hover{transform:translateY(-1px)}.v10-soft{background:#f1f5f9;color:#334155;border:1px solid #dbe4ee}
.v10-session-grid{display:grid;gap:18px}.v10-session-card{position:relative;overflow:hidden;background:#fff;border:1px solid #e4ebf3;border-radius:26px;padding:22px;box-shadow:0 16px 42px rgba(15,48,73,.08)}.v10-card-accent{position:absolute;inset:0 0 auto 0;height:5px;background:linear-gradient(90deg,#0ea5e9,#14b8a6,#f59e0b,#8b5cf6)}
.v10-session-card-head{display:flex;justify-content:space-between;gap:15px;align-items:flex-start}.v10-session-title-wrap{display:flex;gap:14px;min-width:0}.v10-session-number{width:48px;height:48px;flex:0 0 48px;border-radius:16px;background:linear-gradient(145deg,#e0f2fe,#ccfbf1);display:grid;place-items:center;font-size:19px;font-weight:950;color:#075985}.v10-session-card h3{margin:7px 0 6px;font-size:22px}.v10-session-card p{margin:0;color:#64748b;line-height:1.8}.v10-more{width:40px;height:40px;padding:0;border-radius:13px;background:#f8fafc;border:1px solid #e2e8f0;color:#64748b;letter-spacing:2px}
.v10-badges,.v10-item-badges{display:flex;flex-wrap:wrap;gap:7px}.v10-status,.v10-source,.v10-item-badges span{display:inline-flex;padding:5px 9px;border-radius:999px;font-size:11px;font-weight:900}.v10-status.active{background:#dcfce7;color:#15803d}.v10-status.locked{background:#fef3c7;color:#b45309}.v10-status.ended{background:#ede9fe;color:#6d28d9}.v10-status.inactive{background:#f1f5f9;color:#64748b}.v10-source{background:#eff6ff;color:#1d4ed8}
.v10-section-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.v10-section-mini{border:1px solid #e2e8f0;border-radius:20px;padding:15px;text-align:right;background:#fff;min-height:148px;cursor:pointer}.v10-section-mini.blue{background:linear-gradient(145deg,#f0f9ff,#fff);border-color:#bae6fd}.v10-section-mini.amber{background:linear-gradient(145deg,#fffbeb,#fff);border-color:#fde68a}.v10-section-mini.purple{background:linear-gradient(145deg,#f5f3ff,#fff);border-color:#ddd6fe}.v10-section-mini-head{display:flex;align-items:center;gap:10px}.v10-section-icon{width:42px;height:42px;border-radius:14px;background:rgba(255,255,255,.85);display:grid;place-items:center;font-size:21px;box-shadow:0 8px 18px rgba(15,23,42,.07)}.v10-section-mini-head div{flex:1}.v10-section-mini-head b{display:block;font-size:16px}.v10-section-mini-head small{color:#64748b}.v10-arrow{font-size:20px}.v10-mini-list{display:grid;gap:5px;margin-top:12px}.v10-mini-list span{font-size:12px;color:#475569;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.v10-mini-list em{font-size:11px;color:#0f766e;font-style:normal;font-weight:900}
.v10-progress-block{padding:13px 0}.v10-progress-label{display:flex;justify-content:space-between;font-size:12px;font-weight:900}.v10-progress{height:9px;background:#edf2f7;border-radius:999px;overflow:hidden;margin-top:7px}.v10-progress i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#0ea5e9,#14b8a6,#f59e0b)}
.v10-session-metrics{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.v10-session-metrics div{padding:11px;background:#f8fafc;border-radius:14px;text-align:center}.v10-session-metrics b{display:block;font-size:18px;color:#0f766e}.v10-session-metrics span{font-size:10px;color:#64748b}.v10-session-metrics .danger b{color:#dc2626}
.v10-session-actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:17px;padding-top:16px;border-top:1px solid #edf2f7}.v10-date{margin-right:auto;font-size:11px;color:#64748b}.v10-empty{grid-column:1/-1;text-align:center;padding:55px 20px;background:white;border:1px dashed #cbd5e1;border-radius:24px}.v10-empty-icon{font-size:48px}
.v10-modal{position:fixed;inset:0;z-index:1000;background:rgba(2,6,23,.62);display:none;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(6px)}.v10-modal.show{display:flex}.v10-modal-card{position:relative;width:min(720px,96vw);max-height:92vh;overflow:auto;background:#fff;border-radius:26px;padding:25px;box-shadow:0 35px 100px rgba(0,0,0,.35)}.v10-modal-xl{width:min(1180px,97vw)}.v10-modal-close{position:absolute;left:16px;top:16px;width:38px;height:38px;border-radius:50%;padding:0;background:#f1f5f9;color:#475569;font-size:24px;z-index:2}
.v10-detail-head{display:flex;justify-content:space-between;gap:20px;padding-left:50px}.v10-detail-head h2{font-size:27px;margin:8px 0}.v10-detail-head p{color:#64748b;line-height:1.8}.v10-detail-head-actions{display:flex;align-items:flex-start;gap:8px}.v10-detail-tabs{display:flex;gap:7px;overflow-x:auto;padding:14px 0;margin-top:8px;border-bottom:1px solid #e8eef5}.v10-detail-tabs button{white-space:nowrap;background:#f8fafc;color:#64748b;border:1px solid #e2e8f0}.v10-detail-tabs button.active{background:#0f766e;color:#fff;border-color:#0f766e}
.v10-overview-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:15px;margin-top:18px}.v10-control-panel,.v10-overview-stats,.v10-chart-card{border:1px solid #e4ebf3;border-radius:22px;padding:18px;background:#fff}.v10-panel-title{display:flex;justify-content:space-between;align-items:center}.v10-panel-title span{font-size:12px;color:#64748b}.v10-panel-title h3{margin:4px 0 0}.v10-switch-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:16px 0}.v10-part-switch{display:flex;align-items:center;gap:9px;text-align:right;border:1px solid #e2e8f0;background:#f8fafc;border-radius:16px;padding:12px}.v10-part-switch>span{font-size:22px}.v10-part-switch div{flex:1}.v10-part-switch b{display:block}.v10-part-switch small{color:#64748b}.v10-part-switch i{font-style:normal;font-size:10px;padding:5px 8px;border-radius:999px;background:#e2e8f0;color:#64748b}.v10-part-switch.on{border-color:#86efac;background:#f0fdf4}.v10-part-switch.on i{background:#dcfce7;color:#15803d}.v10-date-grid,.v10-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.v10-date-grid label,.v10-form-grid label{display:grid;gap:6px;color:#475569;font-size:12px;font-weight:900}.v10-date-grid input,.v10-form-grid input,.v10-form-grid select,.v10-form-grid textarea{margin:0}.v10-control-actions,.v10-form-actions,.v10-report-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}
.v10-overview-stats{display:grid;grid-template-columns:1fr 1fr;gap:9px}.v10-stat-card{border-radius:18px;background:#f8fafc;padding:14px}.v10-stat-card span{font-size:21px}.v10-stat-card b{display:block;font-size:25px;color:#0f766e}.v10-stat-card small{color:#64748b}.v10-stat-card.warn{background:#fff7ed}.v10-stat-card.warn b{color:#ea580c}
.v10-flow{margin-top:15px;border:1px solid #e4ebf3;border-radius:22px;padding:18px;background:linear-gradient(145deg,#f8fafc,#fff)}.v10-flow h3{margin-top:0}.v10-flow-line{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;align-items:center;gap:8px}.v10-flow-line button{min-height:110px;border-radius:18px;background:white;border:1px solid #e2e8f0}.v10-flow-line button span{display:block;font-size:25px}.v10-flow-line button b{display:block;margin:5px}.v10-flow-line button small{color:#64748b}.v10-flow-line i{font-size:24px;color:#94a3b8}
.v10-section-tab{margin-top:18px}.v10-section-tab-head{display:flex;align-items:center;justify-content:space-between;gap:15px;border-radius:22px;padding:17px 19px}.v10-section-tab-head.blue{background:#f0f9ff;border:1px solid #bae6fd}.v10-section-tab-head.amber{background:#fffbeb;border:1px solid #fde68a}.v10-section-tab-head.purple{background:#f5f3ff;border:1px solid #ddd6fe}.v10-section-tab-head>div{display:flex;align-items:center;gap:12px}.v10-section-tab-head>div>span{font-size:28px}.v10-section-tab-head h3{margin:0}.v10-section-tab-head p{margin:3px 0 0;color:#64748b}.v10-item-list{display:grid;gap:10px;margin-top:13px}.v10-item-card{display:grid;grid-template-columns:42px 1fr auto;gap:13px;align-items:center;border:1px solid #e2e8f0;border-radius:18px;padding:14px;background:#fff}.v10-item-card.system{background:linear-gradient(145deg,#f8fafc,#fff)}.v10-item-order{width:38px;height:38px;border-radius:13px;background:#f1f5f9;display:grid;place-items:center;font-weight:950;color:#475569}.v10-item-main h4{margin:6px 0 3px}.v10-item-main p{margin:0;color:#64748b}.v10-item-main small{color:#0f766e;font-weight:800}.v10-item-badges span{background:#f1f5f9;color:#475569}.v10-item-badges span.ok{background:#dcfce7;color:#15803d}.v10-item-actions{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}.v10-item-actions button{padding:8px 10px;font-size:11px}.v10-lock-btn{background:#eff6ff!important;color:#1d4ed8!important;border:1px solid #bfdbfe!important}.v10-empty-inline{display:flex;align-items:center;gap:13px;padding:22px;border:1px dashed #cbd5e1;border-radius:18px;color:#64748b}.v10-empty-inline>span{font-size:30px}.v10-empty-inline b{color:#334155}.v10-empty-inline p{margin:4px 0 0}
.v10-analytics{display:grid;gap:14px;margin-top:18px}.v10-analytics-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.v10-analytics-cards>div{padding:16px;border-radius:18px;background:#f8fafc;border:1px solid #e2e8f0}.v10-analytics-cards span,.v10-analytics-cards small{display:block;color:#64748b}.v10-analytics-cards b{display:block;font-size:28px;margin:5px 0;color:#0f766e}.v10-analytics-cards .warn{background:#fff7ed}.v10-analytics-cards .warn b{color:#ea580c}.v10-hbar{display:grid;grid-template-columns:140px 1fr 140px;align-items:center;gap:10px;margin:14px 0}.v10-hbar>div{height:12px;background:#edf2f7;border-radius:999px;overflow:hidden}.v10-hbar i{display:block;height:100%;border-radius:999px}.v10-hbar i.blue{background:#0ea5e9}.v10-hbar i.amber{background:#f59e0b}.v10-hbar i.purple{background:#8b5cf6}.v10-hbar b{font-size:12px;color:#475569}.v10-alert-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.v10-insight{display:flex;gap:12px;padding:15px;border-radius:18px}.v10-insight>span{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:18px;font-weight:950}.v10-insight.good{background:#f0fdf4}.v10-insight.good>span{background:#dcfce7;color:#15803d}.v10-insight.warn{background:#fff7ed}.v10-insight.warn>span{background:#ffedd5;color:#ea580c}.v10-insight p{margin:4px 0 0;color:#64748b;line-height:1.8}
.v10-form-head{display:flex;gap:13px;align-items:center;margin-bottom:18px}.v10-form-head>span{width:52px;height:52px;border-radius:17px;background:#ecfeff;display:grid;place-items:center;font-size:26px}.v10-form-head h2{margin:0}.v10-form-head p{margin:4px 0 0;color:#64748b}.v10-form-grid .full{grid-column:1/-1}.v10-form-note{margin-top:13px;padding:12px;border-radius:14px;background:#f0f9ff;color:#075985;line-height:1.8}
@media(max-width:1000px){.v10-session-hero,.v10-overview-grid{grid-template-columns:1fr}.v10-session-metrics{grid-template-columns:repeat(3,1fr)}.v10-flow-line{grid-template-columns:1fr 1fr}.v10-flow-line i{display:none}.v10-analytics-cards{grid-template-columns:1fr 1fr}.v10-toolbar{align-items:stretch;flex-direction:column}.v10-toolbar-main{grid-template-columns:1fr 1fr}}
@media(max-width:720px){.v10-session-hero{padding:20px}.v10-hero-stats,.v10-section-row,.v10-switch-grid,.v10-overview-stats,.v10-alert-grid,.v10-date-grid,.v10-form-grid,.v10-toolbar-main{grid-template-columns:1fr}.v10-session-card{padding:16px}.v10-session-title-wrap{align-items:flex-start}.v10-session-number{width:40px;height:40px;flex-basis:40px}.v10-session-metrics{grid-template-columns:1fr 1fr}.v10-session-actions{align-items:stretch}.v10-session-actions button{flex:1}.v10-date{width:100%;margin:4px 0 0}.v10-detail-head{display:block;padding-left:35px}.v10-detail-head-actions{margin-top:10px}.v10-flow-line{grid-template-columns:1fr}.v10-item-card{grid-template-columns:38px 1fr}.v10-item-actions{grid-column:1/-1;justify-content:flex-start}.v10-analytics-cards{grid-template-columns:1fr 1fr}.v10-hbar{grid-template-columns:1fr}.v10-form-grid .full{grid-column:auto}}