ul{
    list-style-type: none;
}
html {
  scroll-behavior: smooth;
}
li{
    text-decoration: none;
    margin-left: 40px;
    margin-right: 40px;
}
header{
    width: 100%;
    padding-top: 20px;
}
.desktop-menu{
    display: flex;
    justify-content: space-between;
    align-items: center;

}
.desktop-menu ul{
    display: flex;
}
.desktop-menu img{
    width: 70px;
    height: 70px;
}

.desktop-menu a{
    color: white;
    text-decoration: none;
    font-size: 20px;
}
.desktop-menu button{
    background: linear-gradient(to left, #860000, #ff2326);
    color:#ffffff;
    width: 105px;
    height: 45px;
    border: 0px;
    border-radius: 25px;
    font-size: 16px;
}
.mobile-menu button{
    background: linear-gradient(to left, #860000, #ff2326);
    color:#ffffff;
    width: 135px;
    height: 45px;
    border: 0px;
    border-radius: 0px;
    font-size: 16px;
    margin-top: 10px;
}
.header-maintext h2{
    font-size: 34px;
    margin-top: 200px;;
    text-align: center;
    color: white;
}
.header-maintext{
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.header-maintext p{
    font-size: 20px;
    margin-top: 50px;
    text-align: center;
    color: white;
}
.header-margin{
    margin-left: 20%;
    margin-right: 20%;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

.desktop-menu {
    display: flex;
    gap: 20px;
    list-style: none;
}

.mobile-menu-btn {
    display: none;
    color: white;
    cursor: pointer;
    font-size: 24px;
}
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    list-style: none;
    z-index: 100;
}

/* animate */
.fade-in-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
.fade-in-element.show{
    opacity: 1;
    transform: translateY(0);
}


.mobile-menu a {
    color: white;
    text-decoration: none;
    font-size: 24px;
    margin: 15px 0;
    display: block;
}
.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    color: white;
    font-size: 30px;
    cursor: pointer;
}





/* do 400px */
@media (max-width: 400px) {
    header{
        background-size: cover;     
        background-repeat: no-repeat;
        width: 100%;
        padding-top: 20px;
    }
    .header-margin{
        margin-left: 5%;
        margin-right: 5%;
    }
    .header-maintext{
        font-size: 16px;
        margin-top: 10px;
        width: 100%;
        color: white;
    }
    .desktop-menu img{
        width: 40px;
        height: 40px;
    }
    li{
        margin-left: 20px;
        margin-right: 20px;
    }
    .desktop-menu a{
        font-size: 14px;
    }
    .desktop-menu button{
        width: 85px;
        height: 35px;
        font-size: 14px;
    }
    .desktop-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }
    
}

@media (min-width: 401px) and (max-width: 600px) {
    header{
        background-size: cover;     
        background-repeat: no-repeat;
        width: 100%;
        padding-top: 20px;
    }
    .header-margin{
        margin-left: 5%;
        margin-right: 5%;
    }
    .header-maintext{
        font-size: 18px;
        margin-top: 10px;
        width: 100%;
        color: white;
    }
    .desktop-menu img{
        width: 40px;
        height: 40px;
    }
    li{
        margin-left: 20px;
        margin-right: 20px;
    }
    .desktop-menu a{
        font-size: 14px;
    }
    .desktop-menu button{
        width: 85px;
        height: 35px;
        font-size: 14px;
    }
    .desktop-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }
}



@media (min-width: 601px) and (max-width: 900px) {
    header{
        background-size: cover;      
        background-repeat: no-repeat;
        width: 100%;
        padding-top: 20px;
    }
    .header-margin{
        margin-left: 5%;
        margin-right: 5%;
    }
    .header-maintext{
        font-size: 25px;
        margin-top: 50px;
        width: 100%;
        color: white;
    }
    .desktop-menu img{
        width: 40px;
        height: 40px;
    }
    li{
        margin-left: 20px;
        margin-right: 20px;
    }
    .desktop-menu a{
        font-size: 14px;
    }
    .desktop-menu button{
        width: 85px;
        height: 35px;
        font-size: 14px;
    }
    .desktop-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
        font-size: 40px;
    }
}
  


@media (min-width: 901px) and (max-width: 1199px) {
    header{
        background-size: cover;     
        background-repeat: no-repeat;
        width: 100%;
        padding-top: 20px;
    }
    .header-margin{
        margin-left: 5%;
        margin-right: 5%;
    }
    .header-maintext{
        font-size: 34px;
        margin-top: 100px;
        width: 100%;
        color: white;
    }
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #050505;
  color: #f5f5f5;
  display: flex;
  justify-content: center;
  padding: 80px 20px;
  box-sizing: border-box;
  background-image:
    radial-gradient(circle at 1px 1px, #141414 1px, transparent 0);
  background-size: 40px 40px;
}

.exam-wrapper {
  width: 100%;
  max-width: 950px;
  background: rgba(5, 5, 5, 0.92);
  border-radius: 18px;
  padding: 30px 30px 24px;
  box-shadow: 0 0 40px rgba(255, 0, 0, 0.35);
  border: 1px solid rgba(255, 0, 0, 0.3);
  backdrop-filter: blur(6px);
}

.exam-header {
  text-align: center;
  margin-bottom: 25px;
}

.exam-header h1 {
  margin: 0 0 8px;
  font-size: 26px;
  letter-spacing: 0.06em;
  color: #ff3b3b;
  text-shadow: 0 0 12px rgba(255, 0, 0, 0.8);
}

.exam-header p {
  margin: 0;
  font-size: 14px;
  color: #bbbbbb;
}

.quiz {
  max-height: 75vh;
  overflow-y: auto;
  padding-right: 8px;
}

.quiz::-webkit-scrollbar {
  width: 6px;
}
.quiz::-webkit-scrollbar-track {
  background: #111;
}
.quiz::-webkit-scrollbar-thumb {
  background: #ff3b3b;
  border-radius: 3px;
}

.question {
  margin-bottom: 20px;
  padding: 16px 18px;
  background: #101010;
  border-radius: 14px;
  border: 1px solid #2a2a2a;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.8);
  transition: border 0.25s ease, box-shadow 0.25s ease, transform 0.15s ease;
}

.question:hover {
  border-color: rgba(255, 0, 0, 0.6);
  box-shadow: 0 0 16px rgba(255, 0, 0, 0.35);
  transform: translateY(-1px);
}

.question h3 {
  margin-top: 0;
  margin-bottom: 15px;
  font-size: 36px;
  font-weight: 600;
}

.question img {
  max-width: 280px;
  width: 100%;
  border-radius: 12px;
  margin: 10px 0 10px;
  display: block;
}

.answer-label {
  display: block;
  position: relative;
  padding: 8px 12px 8px 32px;
  margin-bottom: 6px;
  border-radius: 10px;
  background: #151515;
  cursor: pointer;
  font-size: 28px;
  color: #e5e5e5;
  transition: background 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
}

.answer-label::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid #777;
  box-sizing: border-box;
}

.answer-label:hover {
  background: #1d1d1d;
  transform: translateY(-1px);
}

.answer-label input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.answer-label.selected {
  background: radial-gradient(circle at top left, rgba(255, 0, 0, 0.35), #1a1a1a);
  box-shadow: 0 0 12px rgba(255, 0, 0, 0.5);
}

.answer-label.selected::before {
  border-color: #ff3b3b;
  background: radial-gradient(circle, #ff3b3b 40%, transparent 41%);
}

.question.correct {
  border-color: #21c45a;
  box-shadow: 0 0 18px rgba(33, 196, 90, 0.6);
}

.question.wrong {
  border-color: #ff3b3b;
  box-shadow: 0 0 18px rgba(255, 0, 0, 0.7);
}

.exam-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 10px 26px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #ff3b3b, #ff0000);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  box-shadow: 0 0 18px rgba(255, 0, 0, 0.75);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s;
}

.btn-primary:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 0 24px rgba(255, 0, 0, 0.95);
  filter: brightness(1.08);
}

.result {
  font-size: 16px;
  font-weight: 600;
  color: #ff3b3b;
  text-shadow: 0 0 10px rgba(255, 0, 0, 0.8);
}

.mainmenu{
    padding: 10px 26px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #ff723b, #ff7b00);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  box-shadow: 0 0 18px rgba(255, 115, 0, 0.75);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s;
}
.mainmenu a {
    color: white;
    text-decoration: none;
}
.explanation{
    color: rgb(173, 173, 2);
    margin-top: 10px;
}


@media (min-width: 1200px) {
    header{
        background-size: cover;
    }
    .header-margin{
        margin-left: 15%;
        margin-right: 15%;
    }
    .desktop-menu a{
        font-size: 18px;
    }
}