/* MKS Course v1.8 */
:root{
  --mks-purple:#8222EE;
  --mks-purple-dark:#5b12b8;
  --mks-purple-soft:#f7f1ff;
  --mks-border:#e8d8ff;
  --mks-text:#454545;
  --mks-dark:#1d1230;
  --mks-green:#118a39;
  --mks-red:#d71920;
  --mks-yellow:#fff7df;
  --mks-blue-soft:#eef5ff;
}

.mks-lesson,
.mks-concept-page,
.mks-learning{
  max-width:1050px;
  margin:0 auto;
  padding:18px;
  font-family:Arial,Helvetica,sans-serif;
  color:var(--mks-text);
  background:#fff;
  line-height:1.65;
}

.mks-lesson *,
.mks-concept-page *,
.mks-learning *{
  box-sizing:border-box;
}

.mks-hero{
  background:linear-gradient(135deg,var(--mks-purple),var(--mks-purple-dark));
  color:#fff;
  padding:34px 26px;
  border-radius:24px;
  margin-bottom:24px;
  box-shadow:0 16px 38px rgba(130,34,238,.25);
}

.mks-topic-label{
  display:inline-block;
  background:rgba(255,255,255,.18);
  border:1px solid rgba(255,255,255,.35);
  padding:7px 13px;
  border-radius:999px;
  font-size:13px;
  font-weight:800;
  letter-spacing:.4px;
  margin-bottom:12px;
}

.mks-hero h1{
  margin:0 0 8px;
  font-size:38px;
  line-height:1.12;
  font-weight:900;
  letter-spacing:-.8px;
  color:#fff;
}

.mks-hero p{
  margin:0;
  max-width:890px;
  font-size:16px;
  color:#f6ecff;
}

.mks-box,
.mks-card{
  background:#fff;
  border:1px solid var(--mks-border);
  border-radius:18px;
  padding:20px;
  margin:18px 0;
  box-shadow:0 7px 20px rgba(130,34,238,.07);
}

.mks-highlight{
  background:var(--mks-purple-soft);
  border-left:6px solid var(--mks-purple);
}

.mks-warning{
  background:var(--mks-yellow);
  border-left:6px solid #f59e0b;
  border-color:#ffe3a6;
}

.mks-blue{
  background:var(--mks-blue-soft);
  border-left:6px solid #3b82f6;
  border-color:#cfe0ff;
}

.mks-section-title{
  color:var(--mks-purple);
  font-size:28px;
  font-weight:900;
  margin:34px 0 14px;
  padding-bottom:9px;
  border-bottom:2px solid var(--mks-border);
  letter-spacing:-.3px;
}

.mks-box h3,
.mks-card h3{
  margin:0 0 10px;
  color:var(--mks-purple);
  font-size:22px;
  font-weight:900;
}

.mks-box p,
.mks-card p{
  margin:8px 0;
  font-size:15.5px;
}

.mks-formula{
  background:#171020;
  color:#fff;
  border-radius:14px;
  padding:15px 17px;
  margin:14px 0;
  font-size:16px;
  font-weight:800;
  overflow-x:auto;
}

.mks-formula span{
  color:#d9b8ff;
}

.mks-grid-2,
.mks-grid-3,
.mks-key-grid{
  display:grid;
  gap:16px;
  margin:18px 0;
}

.mks-grid-2{
  grid-template-columns:repeat(2,minmax(0,1fr));
}

.mks-grid-3{
  grid-template-columns:repeat(3,minmax(0,1fr));
}

.mks-key-grid{
  grid-template-columns:repeat(7,minmax(0,1fr));
}

.mks-mini-card,
.mks-key-item{
  background:#fff;
  border:1px solid var(--mks-border);
  border-radius:16px;
  padding:16px;
  box-shadow:0 5px 15px rgba(130,34,238,.06);
}

.mks-key-item{
  text-align:center;
  font-weight:900;
  color:var(--mks-dark);
  padding:12px 8px;
}

.mks-key-item strong{
  color:var(--mks-purple);
}

.mks-mini-card h4{
  margin:0 0 8px;
  color:var(--mks-dark);
  font-size:18px;
  font-weight:900;
}

.mks-mini-card p{
  margin:6px 0;
  font-size:15px;
}

.mks-table-wrap{
  overflow-x:auto;
  margin:16px 0;
  border-radius:16px;
  border:1px solid var(--mks-border);
}

.mks-table{
  width:100%;
  border-collapse:collapse;
  min-width:680px;
  background:#fff;
}

.mks-table th{
  background:var(--mks-purple);
  color:#fff;
  padding:12px;
  text-align:left;
  font-size:14px;
  border:1px solid #9d54f2;
}

.mks-table td{
  padding:11px 12px;
  border:1px solid var(--mks-border);
  font-size:14.5px;
  vertical-align:top;
}

.mks-table tr:nth-child(even) td{
  background:#fbf8ff;
}

.mks-step{
  display:flex;
  gap:13px;
  background:#fff;
  border:1px solid var(--mks-border);
  border-radius:16px;
  padding:15px;
  margin:12px 0;
}

.mks-step-number{
  min-width:36px;
  height:36px;
  background:var(--mks-purple);
  color:#fff;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:900;
}

.mks-step-content h4{
  margin:0 0 5px;
  color:var(--mks-dark);
  font-size:17px;
}

.mks-step-content p{
  margin:0;
  font-size:15px;
}

.mks-example{
  border:1px solid var(--mks-border);
  border-radius:18px;
  padding:18px;
  margin:16px 0;
  background:linear-gradient(180deg,#fff,#fbf8ff);
}

.mks-example h4{
  margin:0 0 10px;
  color:var(--mks-purple);
  font-size:19px;
  font-weight:900;
}

.mks-solution{
  background:#fff;
  border-left:5px solid var(--mks-green);
  padding:12px 14px;
  border-radius:12px;
  margin-top:10px;
}

.mks-solution strong{
  color:var(--mks-green);
}

.mks-list{
  padding-left:21px;
  margin:10px 0;
}

.mks-list li{
  margin-bottom:8px;
  font-size:15.5px;
}

.mks-final-summary,
.mks-answer-key{
  background:linear-gradient(135deg,var(--mks-purple),var(--mks-purple-dark));
  color:#fff;
  padding:24px;
  border-radius:22px;
  margin-top:32px;
}

.mks-final-summary h2,
.mks-answer-key h2{
  margin:0 0 12px;
  font-size:26px;
  color:#fff;
}

.mks-final-summary ul{
  margin:0;
  padding-left:22px;
}

.mks-final-summary li{
  margin-bottom:8px;
  color:#f6ecff;
}

/* Class Material */
.mks-class-material .mks-q-list{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
  margin:12px 0;
}

.mks-class-material .mks-q-card{
  background:linear-gradient(180deg,#ffffff,#fbf8ff);
  border:1px solid var(--mks-border);
  border-radius:12px;
  padding:12px 14px;
  margin:0;
  box-shadow:0 5px 14px rgba(130,34,238,.06);
}

.mks-class-material .mks-q-card h4{
  margin:0 0 8px;
  color:var(--mks-purple);
  font-size:15.5px;
  line-height:1.35;
  font-weight:900;
}

.mks-class-material .mks-q-card p{
  margin:5px 0;
  font-size:14px;
  line-height:1.45;
}

.mks-class-material .mks-options-line{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-top:8px;
}

.mks-class-material .mks-options-line span{
  background:#fff;
  border:1px solid var(--mks-border);
  border-radius:9px;
  padding:5px 9px;
  font-size:13.5px;
  font-weight:700;
  color:var(--mks-dark);
}

/* Quiz Layout */
.mks-mc-quiz{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:#1c1c21;
  line-height:1.45;
  width:100%;
  max-width:1050px;
  margin:12px auto;
  font-size:15px;
}

.mks-mc-quiz h1{
  text-align:center;
  color:#333;
  border-bottom:2px solid var(--mks-purple);
  padding-bottom:8px;
  margin:0 auto 6px;
  font-size:clamp(22px,2.8vw,34px);
  line-height:1.12;
  font-weight:900;
}

.mks-mc-quiz .test-subtitle{
  text-align:center;
  font-size:clamp(15px,1.7vw,20px);
  font-weight:800;
  color:var(--mks-purple);
  margin:2px 0 12px;
}

.mks-mc-quiz .q-card{
  background:linear-gradient(180deg,#f7f1ff,#efe3ff);
  border:1px solid #b987ff;
  border-radius:10px;
  padding:12px;
  margin:10px 0;
  box-shadow:0 3px 9px rgba(130,34,238,.07);
}

.mks-mc-quiz .btn{
  font-family:inherit;
  font-size:15px;
  font-weight:700;
  color:#fff;
  border:none;
  border-radius:8px;
  padding:8px 15px;
  min-height:38px;
  cursor:pointer;
  transition:all .2s ease;
}

.mks-mc-quiz .btn:hover:not(:disabled){
  opacity:.85;
}

.mks-mc-quiz .btn:disabled{
  background-color:#ccc;
  cursor:not-allowed;
}

.mks-mc-quiz .btn.check-one{
  background:var(--mks-purple);
  color:#fff;
  border-radius:8px;
  margin-top:8px;
}

.mks-mc-quiz .correct{
  outline:2px solid #2e7d32;
  background:#e8f5e9;
}

.mks-mc-quiz .incorrect{
  outline:2px solid #c62828;
  background:#ffebee;
}

.mks-mc-quiz .explain{
  background:#f0f4c3;
  border:2px solid #000;
  border-radius:9px;
  padding:9px 10px;
  margin-top:9px;
  font-size:14px;
}

.mks-mc-quiz .q-head{
  font-weight:700;
  font-size:15.5px;
  margin-bottom:10px;
  padding-bottom:8px;
  border-bottom:1px solid #ddd;
  line-height:1.32;
}

.mks-mc-quiz .q-head .q-number{
  display:inline-block;
  background:var(--mks-purple);
  color:#fff;
  padding:2px 7px;
  border-radius:6px;
  margin-right:8px;
  font-size:14px;
}

.mks-mc-quiz .options{
  list-style-type:none;
  padding-left:0;
  margin:0;
}

.mks-mc-quiz .options li{
  padding:4px 0;
}

.mks-mc-quiz .options label{
  display:block;
  min-height:38px;
  padding:8px 10px;
  border-radius:8px;
  background:#fdfdfa;
  border:1px solid #eee;
  cursor:pointer;
  font-size:15px;
}

.mks-mc-quiz .options label:hover{
  background:#f9f9f0;
}

.mks-mc-quiz .options input[type="radio"]{
  width:16px;
  height:16px;
  margin-right:8px;
  accent-color:var(--mks-purple);
}

.mks-mc-quiz .controls{
  background:#fff;
  border:2px solid #000;
  border-radius:10px;
  padding:10px 12px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  margin-top:12px;
}

.mks-mc-quiz .controls .btn{
  margin-right:8px;
}

.mks-mc-quiz .controls .check-all{
  background-color:#1e88e5;
}

.mks-mc-quiz .controls .reset{
  background-color:#e53935;
}

.mks-mc-quiz .score{
  font-size:15px;
  font-weight:700;
  color:#333;
  background:#f1f1ff;
  padding:8px 11px;
  border-radius:8px;
  white-space:nowrap;
}

/* GRE lesson practice/class-material compact override */
.mks-gre-practice-set{
  margin:4px auto 16px !important;
  padding:0 8px 14px !important;
  line-height:1.32 !important;
}

.mks-gre-practice-set h1{
  margin:0 auto 4px !important;
  padding:0 0 6px !important;
  font-size:clamp(18px,2.2vw,28px) !important;
  line-height:1.08 !important;
  border-bottom-width:2px !important;
}

.mks-gre-practice-set .test-subtitle{
  margin:2px 0 8px !important;
  font-size:clamp(13px,1.35vw,17px) !important;
  line-height:1.2 !important;
}

.mks-gre-practice-set .q-card{
  background:linear-gradient(180deg,#f7f1ff 0%,#efe3ff 100%) !important;
  border-color:#b987ff !important;
  border-width:1px !important;
  border-radius:10px !important;
  padding:9px 10px !important;
  margin:6px 0 !important;
  box-shadow:0 5px 12px rgba(130,34,238,.08) !important;
}

.mks-gre-practice-set .q-head{
  align-items:center !important;
  gap:7px !important;
  margin:0 0 7px !important;
  padding-bottom:6px !important;
  border-bottom-color:rgba(130,34,238,.18) !important;
  font-size:clamp(15px,1.25vw,18px) !important;
  line-height:1.28 !important;
}

.mks-gre-practice-set .q-number{
  display:inline-flex !important;
  align-items:center !important;
  justify-content:center !important;
  align-self:center !important;
  flex:0 0 auto !important;
  min-width:30px !important;
  height:30px !important;
  padding:0 6px !important;
  border-radius:8px !important;
  font-size:14px !important;
  box-shadow:0 4px 10px rgba(130,34,238,.18) !important;
}

.mks-gre-practice-set .q-text{
  min-width:0 !important;
  width:100% !important;
}

.mks-gre-practice-set .q-text p{
  margin:0 !important;
}

.mks-gre-practice-set .mks-qc{
  display:none !important;
}

.mks-gre-practice-set .mks-gre-qc-prompt{
  margin:0 0 10px !important;
  color:#111827 !important;
  font-size:clamp(16px,1.55vw,22px) !important;
  font-weight:800 !important;
  line-height:1.35 !important;
}

.mks-gre-practice-set .mks-gre-qc-prompt p{
  margin:0 !important;
}

.mks-gre-practice-set .mks-gre-qc-table{
  display:grid !important;
  grid-template-columns:repeat(2,minmax(0,1fr)) !important;
  width:100% !important;
  margin:10px 0 2px !important;
  overflow:hidden !important;
  background:#fff !important;
  border:2px solid #cbd5e1 !important;
  border-radius:18px !important;
  box-shadow:0 8px 18px rgba(15,23,42,.055) !important;
}

.mks-gre-practice-set .mks-gre-qc-col{
  min-width:0 !important;
  padding:15px 20px 17px !important;
  text-align:center !important;
}

.mks-gre-practice-set .mks-gre-qc-col + .mks-gre-qc-col{
  border-left:2px solid #cbd5e1 !important;
}

.mks-gre-practice-set .mks-gre-qc-label{
  margin:0 0 12px !important;
  padding:0 0 10px !important;
  border-bottom:2px solid #dbe3ef !important;
  color:#1f2937 !important;
  font-size:clamp(17px,1.7vw,24px) !important;
  font-weight:900 !important;
  line-height:1.15 !important;
}

.mks-gre-practice-set .mks-gre-qc-value{
  color:#111827 !important;
  font-size:clamp(15px,1.45vw,20px) !important;
  font-weight:700 !important;
  line-height:1.35 !important;
}

.mks-gre-practice-set .mks-gre-qc-value p{
  margin:0 !important;
}

.mks-gre-practice-set .options{
  gap:5px !important;
}

.mks-gre-practice-set .options label{
  gap:8px !important;
  min-height:34px !important;
  padding:5px 9px !important;
  border-radius:7px !important;
  background:#fff !important;
  border-color:#e4d2ff !important;
  font-size:15px !important;
  font-weight:700 !important;
  line-height:1.25 !important;
  box-shadow:none !important;
}

.mks-gre-practice-set .options input[type="radio"]{
  width:14px !important;
  height:14px !important;
  margin:0 !important;
}

.mks-gre-practice-set .btn{
  min-height:34px !important;
  padding:6px 13px !important;
  border-radius:7px !important;
  font-size:15px !important;
  line-height:1.2 !important;
  box-shadow:0 4px 10px rgba(124,43,234,.14) !important;
}

.mks-gre-practice-set .btn.check-one{
  margin-top:7px !important;
}

.mks-gre-practice-set .explain{
  margin-top:7px !important;
  padding:7px 9px !important;
  border-left-width:3px !important;
  border-radius:8px !important;
  font-size:13px !important;
  line-height:1.35 !important;
}

.mks-gre-practice-set .explain p{
  margin:4px 0 !important;
}

.mks-gre-practice-set .controls{
  gap:7px !important;
  margin-top:8px !important;
  padding:7px 8px !important;
  border-radius:10px !important;
  box-shadow:0 -4px 12px rgba(42,31,61,.06) !important;
}

.mks-gre-practice-set .controls-buttons{
  gap:6px !important;
}

.mks-gre-practice-set .score{
  padding:6px 9px !important;
  border-radius:8px !important;
  font-size:15px !important;
  line-height:1.2 !important;
}

.mks-gre-practice-answer-key{
  margin-top:10px !important;
  padding:10px !important;
  border-width:1px !important;
  border-radius:10px !important;
  box-shadow:0 4px 12px rgba(124,43,234,.055) !important;
}

.mks-gre-practice-answer-key h2{
  margin:0 0 8px !important;
  font-size:16px !important;
}

.mks-gre-practice-answer-key ol{
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr)) !important;
  gap:5px !important;
}

.mks-gre-practice-answer-key li{
  grid-template-columns:24px 30px minmax(0,1fr) !important;
  gap:5px !important;
  min-height:28px !important;
  padding:4px 6px !important;
  border-radius:7px !important;
  font-size:12px !important;
}

.mks-gre-practice-answer-key__number,
.mks-gre-practice-answer-key__letter{
  min-width:22px !important;
  height:22px !important;
  border-radius:6px !important;
}

sup{
  font-size:72%;
  font-weight:700;
}

@media(max-width:768px){
  .mks-lesson,
  .mks-concept-page,
  .mks-learning{
    padding:12px;
  }

  .mks-hero{
    padding:26px 20px;
  }

  .mks-hero h1{
    font-size:30px;
  }

  .mks-section-title{
    font-size:24px;
  }

  .mks-grid-2,
  .mks-grid-3{
    grid-template-columns:1fr;
  }

  .mks-key-grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }

  .mks-class-material .mks-options-line span{
    width:100%;
  }

  .mks-step{
    flex-direction:column;
  }

  .mks-table{
    min-width:620px;
  }

  .mks-mc-quiz{
    margin:10px auto;
  }

  .mks-mc-quiz .controls{
    flex-direction:column;
    align-items:stretch;
  }

  .mks-mc-quiz .btn{
    width:100%;
    margin:4px 0;
  }

  .mks-mc-quiz .score{
    text-align:center;
  }

  .mks-gre-practice-set .q-card{
    padding:8px !important;
  }

  .mks-gre-practice-set .mks-gre-qc-table{
    border-radius:14px !important;
  }

  .mks-gre-practice-set .mks-gre-qc-col{
    padding:12px 10px 14px !important;
  }

  .mks-gre-practice-set .mks-gre-qc-label{
    font-size:16px !important;
  }

  .mks-gre-practice-set .mks-gre-qc-value{
    font-size:14px !important;
  }

  .mks-gre-practice-set .q-head{
    font-size:15px !important;
  }

  .mks-gre-practice-set .options label{
    min-height:34px !important;
    font-size:14px !important;
  }

  .mks-gre-practice-set .controls{
    padding:8px !important;
  }
}