* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 20px;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

.collapsible-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

/* Collapsible styles */
.collapsible {
    margin-bottom: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
}

.collapsible:last-child {
    margin-bottom: 0;
}

.collapsible__trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 15px 20px;
    background: #f8f9fa;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #2c3e50;
    transition: background-color 0.3s ease;
    text-align: left;
}

.collapsible__trigger:hover {
    background: #e9ecef;
}

.collapsible__trigger:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.5);
}

.collapsible__title {
    flex: 1;
}

.collapsible__arrow {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    color: #6c757d;
}

/* Анимация для стрелки */
.collapsible--expanded .collapsible__arrow {
    transform: rotate(180deg);
}

/* Стили для контента */
.collapsible__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: white;
}

.collapsible--expanded .collapsible__content {
    max-height: 500px; /* Достаточно большое значение для контента */
    transition: max-height 0.5s ease-in;
}

.collapsible__content-inner {
    padding: 20px;
    border-top: 1px solid #e0e0e0;
}

.collapsible__content-inner p {
    margin-bottom: 10px;
}

.collapsible__content-inner p:last-child {
    margin-bottom: 0;
}

.collapsible__content-inner ul {
    margin-left: 20px;
    margin-top: 10px;
}

.collapsible__content-inner li {
    margin-bottom: 5px;
}

/* Адаптивность */
@media (max-width: 600px) {
    .container {
        margin: 20px auto;
    }

    .collapsible__trigger {
        padding: 12px 15px;
        font-size: 14px;
    }

    .collapsible__content-inner {
        padding: 15px;
    }
}

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