/* =========================================================
   COMMON TEST ENGINE
   Reusable CSS — no exam/subject-specific names
   ========================================================= */

:root{
  --bg:#08050f;
  --panel:#171022;
  --panel2:#24143b;
  --text:#faf7ff;
  --muted:#c5b9d8;
  --purple:#9b4dff;
  --purple2:#c77dff;
  --purple3:#6f21d9;
  --violet:#7b2cff;
  --gold:#f7cf63;
  --green:#20e0ad;
  --red:#ff477d;
  --line:rgba(207,145,255,.20);
  --shadow:0 30px 90px rgba(0,0,0,.65);
}

*{box-sizing:border-box}

html,body{
  margin:0;
  padding:0;
  min-height:100%;
}

body{
  background:
    radial-gradient(circle at 50% 8%,rgba(184,92,255,.34),transparent 30%),
    radial-gradient(circle at 8% 70%,rgba(111,33,217,.25),transparent 32%),
    radial-gradient(circle at 92% 45%,rgba(199,125,255,.18),transparent 28%),
    linear-gradient(135deg,#07030d 0%,#12071d 45%,#09040f 100%);
  color:var(--text);
  font-family:Georgia,"Times New Roman",serif;
  min-height:100vh;
}

body:before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:linear-gradient(120deg,transparent 35%,rgba(255,255,255,.025),transparent 65%);
}

button{
  font:inherit;
}

.test-app{
  width:min(1400px,96vw);
  margin:28px auto 45px;
  border:1px solid rgba(196,115,255,.95);
  border-radius:22px;
  background:linear-gradient(135deg,rgba(30,16,48,.97),rgba(13,8,23,.985));
  box-shadow:
    0 0 0 1px rgba(205,130,255,.16),
    0 0 22px rgba(167,72,255,.38),
    0 0 65px rgba(116,31,221,.24),
    var(--shadow);
  overflow:hidden;
  position:relative;
}

.test-app:before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(circle at 70% 0%,rgba(255,255,255,.10),transparent 25%);
}

.test-header{
  display:flex;
  align-items:center;
  gap:26px;
  padding:28px 30px 20px;
  position:relative;
}

.test-cover{
  width:168px;
  height:96px;
  flex:0 0 168px;
  border-radius:9px;
  overflow:hidden;
  background:linear-gradient(135deg,#7c4419,#e9a94d 42%,#243e64);
  box-shadow:0 10px 28px rgba(0,0,0,.45);
}

.test-cover img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.test-info{
  min-width:0;
}

.test-title{
  margin:0 0 8px;
  font-size:38px;
  color:#fff;
}

.test-subtitle{
  margin:0;
  color:#f0f1f5;
  font-size:19px;
}

.test-meta{
  margin-top:10px;
  color:#9ea8ba;
  font:12px Arial,sans-serif;
}

.test-timer{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:14px;
  font-size:26px;
  color:#fff;
  font-family:Arial,sans-serif;
  white-space:nowrap;
}

.timer-icon{
  font-size:37px;
}

.test-close{
  font-size:38px;
  margin-left:20px;
  color:#fff;
  cursor:pointer;
}

.test-main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 398px;
  gap:28px;
  padding:12px 28px 26px;
  position:relative;
}

.question-panel{
  min-height:680px;
  border:1px solid rgba(194,112,255,.16);
  border-radius:16px;
  padding:28px 36px;
  background:linear-gradient(145deg,rgba(28,16,45,.72),rgba(11,7,19,.72));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.035),0 12px 40px rgba(0,0,0,.22);
}

.question-top{
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:18px;
  color:#fff;
}

.bookmark{
  font-size:25px;
  cursor:pointer;
  color:#d5dbe5;
  border:0;
  background:transparent;
}

.bookmark.active{
  color:var(--gold);
}

.question-text{
  font-size:31px;
  line-height:1.23;
  margin:26px 0 24px;
  color:#f7f7fa;
  max-width:920px;
}

.options{
  display:grid;
  gap:11px;
}

.option{
  display:grid;
  grid-template-columns:62px 1fr;
  align-items:center;
  min-height:78px;
  width:100%;
  border:1px solid rgba(255,255,255,.19);
  border-radius:12px;
  background:linear-gradient(105deg,rgba(37,20,59,.82),rgba(20,12,31,.88));
  color:#fff;
  cursor:pointer;
  transition:.2s;
  overflow:hidden;
  text-align:left;
  padding:0;
}

.option:hover{
  border-color:rgba(203,126,255,.90);
  transform:translateY(-1px);
  box-shadow:0 0 18px rgba(155,77,255,.18);
}

.option-letter{
  height:100%;
  min-height:78px;
  display:grid;
  place-items:center;
  font:bold 24px Arial,sans-serif;
  color:#fff;
  background:rgba(255,255,255,.07);
}

.option-text{
  font:18px Arial,sans-serif;
  color:#f0f2f6;
  padding:15px 20px;
}

.option.selected{
  border-color:var(--purple2);
  box-shadow:
    0 0 0 1px rgba(199,125,255,.55),
    0 0 25px rgba(155,77,255,.35);
}

.option.selected .option-letter{
  background:linear-gradient(145deg,#a957ff,#7425dc);
  box-shadow:inset 0 0 15px rgba(255,255,255,.12);
}

.option.correct{
  border-color:var(--green);
  background:rgba(32,215,160,.12);
}

.option.correct .option-letter{
  background:var(--green);
  color:#06150f;
}

.option.wrong{
  border-color:var(--red);
  background:rgba(255,63,114,.10);
}

.option.wrong .option-letter{
  background:var(--red);
}

.feedback{
  margin-top:17px;
  border-radius:12px;
  padding:16px 18px;
  font:14px/1.55 Arial,sans-serif;
  display:none;
}

.feedback.show{
  display:block;
}

.feedback.good{
  border:1px solid rgba(32,215,160,.5);
  background:rgba(32,215,160,.09);
}

.feedback.bad{
  border:1px solid rgba(255,63,114,.5);
  background:rgba(255,63,114,.08);
}

.question-source{
  margin-top:13px;
  padding:12px 15px;
  border-left:3px solid var(--purple2);
  background:rgba(155,77,255,.075);
  box-shadow:inset 10px 0 28px rgba(155,77,255,.035);
  font:11px/1.5 Arial,sans-serif;
  color:#c5cbd6;
}

.source-highlight{
  color:#d493ff;
  font-weight:700;
  text-shadow:0 0 10px rgba(197,125,255,.35);
}

.source-note{
  color:#aab2c0;
}

.question-navigation{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 0 0;
  gap:15px;
}

.nav-button{
  height:56px;
  border-radius:10px;
  padding:0 30px;
  border:1px solid rgba(255,255,255,.14);
  font:bold 16px Arial,sans-serif;
  cursor:pointer;
}

.nav-button.previous{
  background:#303745;
  color:#9299a7;
}

.nav-button.next{
  background:linear-gradient(135deg,#ffd34e,#ffbe27);
  color:#17130a;
  min-width:150px;
}

.nav-button:disabled{
  opacity:.4;
  cursor:not-allowed;
}

.question-counter{
  text-align:center;
  color:#e8e9ee;
  font:18px Arial,sans-serif;
}

.question-dots{
  display:flex;
  gap:10px;
  justify-content:center;
  margin-top:10px;
}

.question-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  background:#687180;
}

.question-dot.current{
  background:#b66aff;
  box-shadow:0 0 12px #a94dff;
}

.palette-panel{
  border:1px solid rgba(255,255,255,.09);
  border-radius:16px;
  background:rgba(15,21,32,.75);
  padding:24px 26px;
  height:max-content;
}

.palette-title{
  font:22px Georgia,serif;
  margin:0 0 22px;
  color:#fff;
}

.palette-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:12px;
}

.palette-button{
  height:48px;
  border:0;
  border-radius:9px;
  background:#3d4657;
  color:#fff;
  font:bold 17px Arial,sans-serif;
  cursor:pointer;
}

.palette-button.current{
  background:linear-gradient(145deg,#a957ff,#7222d8);
  box-shadow:0 0 20px rgba(155,77,255,.55);
}

.palette-button.answered{
  background:#17c998;
}

.palette-button.review{
  background:#ff376c;
}

.palette-legend{
  margin:24px 0 12px;
  display:grid;
  gap:13px;
  font:14px Arial,sans-serif;
  color:#d0d5df;
}

.legend-item{
  display:flex;
  align-items:center;
  gap:14px;
}

.legend-dot{
  width:17px;
  height:17px;
  border-radius:50%;
  display:inline-block;
}

.legend-current{background:#087cff}
.legend-answered{background:#17c998}
.legend-unanswered{background:#7b8594}
.legend-review{background:#ff376c}

.test-footer{
  padding:18px 30px;
  background:rgba(0,0,0,.22);
  font:12px Arial,sans-serif;
  color:#8791a3;
  display:flex;
  justify-content:space-between;
}

.result-panel{
  display:none;
  margin:0 28px 26px;
  padding:28px;
  border:1px solid rgba(32,215,160,.4);
  border-radius:16px;
  background:rgba(32,215,160,.08);
  font:18px/1.7 Arial,sans-serif;
}

.result-panel.show{
  display:block;
}

.hidden{
  display:none!important;
}

@media(max-width:1000px){
  .test-main{
    grid-template-columns:1fr;
  }

  .palette-panel{
    order:-1;
  }

  .question-text{
    font-size:25px;
  }

  .test-title{
    font-size:29px;
  }
}

@media(max-width:700px){
  body{
    font-size:14px;
    overflow-x:hidden;
  }

  .test-app{
    width:calc(100vw - 14px);
    margin:10px auto 14px;
    border-radius:17px;
  }

  .test-header{
    padding:14px;
    gap:12px;
    border-bottom:1px solid rgba(196,115,255,.12);
  }

  .test-cover{
    width:76px;
    height:55px;
    flex-basis:76px;
  }

  .test-title{
    font-size:20px;
    line-height:1.05;
    margin-bottom:5px;
  }

  .test-subtitle{
    font-size:12px;
    line-height:1.25;
  }

  .test-meta{
    font-size:8px;
    line-height:1.3;
    margin-top:5px;
  }

  .test-timer{
    font-size:12px;
    gap:4px;
  }

  .timer-icon{
    font-size:20px;
  }

  .test-close{
    font-size:27px;
    margin-left:3px;
  }

  .test-main{
    display:flex;
    flex-direction:column;
    gap:10px;
    padding:8px;
  }

  .palette-panel{
    order:2;
    padding:12px;
    border-radius:12px;
  }

  .palette-title{
    font-size:16px;
    margin-bottom:10px;
  }

  .palette-grid{
    grid-template-columns:repeat(10,1fr);
    gap:5px;
  }

  .palette-button{
    height:31px;
    border-radius:6px;
    font-size:11px;
  }

  .palette-legend{
    grid-template-columns:repeat(2,1fr);
    gap:7px;
    margin:11px 0 0;
    font-size:10px;
  }

  .legend-dot{
    width:10px;
    height:10px;
  }

  .question-panel{
    order:1;
    min-height:0;
    padding:16px 12px 13px;
    border-radius:12px;
  }

  .question-top{
    font-size:13px;
  }

  .bookmark{
    font-size:21px;
  }

  .question-text{
    font-size:20px;
    line-height:1.25;
    margin:17px 0 14px;
  }

  .options{
    gap:8px;
  }

  .option{
    grid-template-columns:43px 1fr;
    min-height:58px;
    border-radius:10px;
  }

  .option-letter{
    min-height:58px;
    font-size:18px;
  }

  .option-text{
    font-size:14px;
    line-height:1.35;
    padding:11px 10px;
  }

  .feedback{
    margin-top:10px;
    padding:12px;
    font-size:12px;
  }

  .question-source{
    margin-top:9px;
    padding:9px 10px;
    font-size:9px;
  }

  .question-navigation{
    padding-top:10px;
    gap:8px;
  }

  .nav-button{
    height:45px;
    padding:0 13px;
    font-size:12px;
    min-width:0;
  }

  .question-counter{
    font-size:13px;
  }

  .question-dots{
    gap:5px;
    margin-top:7px;
  }

  .question-dot{
    width:7px;
    height:7px;
  }

  .test-footer{
    padding:10px 12px;
    font-size:8px;
    line-height:1.4;
    display:block;
  }
}

@media(max-width:390px){
  .test-header{
    padding:11px 10px;
  }

  .test-cover{
    width:64px;
    height:48px;
    flex-basis:64px;
  }

  .test-title{
    font-size:17px;
  }

  .test-subtitle{
    font-size:10px;
  }

  .test-meta{
    font-size:7px;
  }

  .test-timer{
    font-size:10px;
  }

  .timer-icon{
    font-size:17px;
  }

  .test-close{
    font-size:23px;
  }

  .question-panel{
    padding:13px 10px;
  }

  .question-text{
    font-size:18px;
  }

  .option{
    grid-template-columns:38px 1fr;
  }

  .option-text{
    font-size:13px;
  }

  .nav-button{
    padding:0 10px;
    font-size:11px;
  }
}