body {
    background-color: rgb(21, 35, 36);
    color: azure;
    font-family: Arial, Helvetica, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px;
}

button {
    background-color: #151c24;
    color: aliceblue;
    border: 1px ridge #00ff88;
    padding: 12px 20px;
    margin: 5px;
    cursor: pointer;
    border-radius: 12px
}
.section a {
    display: inline-block;
    background-color: #151c24;
    color: aliceblue;
    border: 1px solid #00ff88;
    padding: 12px 20px;
    margin: 5px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 13.3333px;
    font-weight: bold;
    box-sizing: border-box;
    text-decoration: none;
    border-radius: 12px
}
.section a:hover {
    background-color: #00ff88;
    color: #0b0f14;
}
.sections {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));
   gap: 20px;
   margin-top: 30px;
}
.section {
    background-color: #151c24;
    border: 1px solid #2a3948;
    border-radius: 12px;
    padding: 25px;
    min-height: 180px;
    box-sizing: border-box;
}
.section h3 {
    color: #00ff88;
}
.section p {
    color: #b8c4d0

}
.section button {
    margin-top: 10px;
}
.topics {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 20px;
}
.topic {
    width: 100%;
    box-sizing: border-box;
    background-color: #151c24;
    border: 1px solid #2a3948;
    border-radius: 12px;
    padding: 20px;

}
.topic h3 {
    color: #00ff88;
    margin: 0 0 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}
.topic-content h4 {
    margin-top: 30 px;
    margin-bottom: 8px;
}
.topic-content h4.exercise-title {
    margin-top: 70px;
}
.topic-content p {
    margin-top: 0;
    margin-bottom: 8px;
}
.topic p {
    color: #b8c4d0;
}
.topic-content {
    display: none;
}
.topic-content.open {
    display: block;
}
.arrow {
    width: 12px;
    height: 12px;
    border-right: 3px solid #00ff88;
    border-bottom: 3px solid #00ff88;
    transform: rotate(45deg);
    border-radius: 2px;
    margin-right: 5px;
}
.arrow.up {
    transform: rotate(225deg);
}
.cia-item {
    background-color: #101820;
    border: 1px solid #2a3948;
    border-radius: 10px;
    padding: 15px;
    margin-top: 12px;
}

.cia-item h5 {
    color: #00ff88;
    margin: 0 0 8px 0;
    font-size: 16px;
}

.cia-item p {
    margin: 0;
}
.drag-items {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.drag-item {
    background-color: #151c24;
    border: 1px solid #00ff88;
    border-radius: 10px;
    padding: 12px 16px;
    cursor: grab;
}

.drag-item:active {
    cursor: grabbing;
}

.examples {
    display: grid;
    gap: 15px;
    margin-top: 25px;
}

.example {
    background-color: #101820;
    border: 1px solid #2a3948;
    border-radius: 10px;
    padding: 15px;
}

.example p {
    margin-top: 0;
}

.drop-zone {
    border: 1px dashed #00ff88;
    border-radius: 8px;
    padding: 12px;
    text-align: center;
    color: #b8c4d0;
}
.result {
    margin-top: 10px;
    font-weight: bold;
}

.drop-zone.correct {
    border-color: #00ff88;
    background-color: #10251c;
}

.drop-zone.wrong {
    border-color: #ff5555;
    background-color: #251010;
}
.exercise-complete {
    display: none;
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #00ff88;
    border-radius: 10px;
    background-color: #10251c;
    color: #00ff88;
    font-weight: bold;
    text-align: center;
}
.exercise-title {
    margin-top: 70px;
    margin-bottom: 15px;
    text-align: center;
}

.exercise-instruction {
    text-align: center;
    color: #b8c4d0;
    margin-bottom: 20px;
}

.drag-items {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 20px;
}
.exercise-instruction {
    text-align: center;
    color: #b8c4d0;
    margin-top: 0;
    margin-bottom: 20px;
}

.mail {
    margin-bottom: 15px;
}


.mail-check {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    color: #b8c4d0;
    font-weight: bold;
}
.mail-check input {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #00ff88;
}

.mail-feedback {
    margin-top: 10px;
    font-weight: bold;
}
.mail-feedback.ok  { color: #00ff88; }
.mail-feedback.bad { color: #ff5555; }

.quiz-buttons {
    margin-top: 15px;
}

.quiz-score {
    display: none;
    margin-top: 15px;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    font-weight: bold;
}
.quiz-score.ok {
    border: 1px solid #00ff88;
    background-color: #10251c;
    color: #00ff88;
}
.quiz-score.bad {
    border: 1px solid #ff5555;
    background-color: #251010;
    color: #ff5555;
}