:root {
    --background-color: linear-gradient(to bottom, #BFE6D2, #78CFA9);
    --background-image: url('/static/images/Pic3.png');

    --text-color: #1F4736;

    --card-background: rgba(255, 255, 255, 0.92);
    --container-background: rgba(255, 255, 255, 0.92);

    --nav-background: #4F9F7C;
    --nav-text-color: white;

    --button-background: linear-gradient(to right, #78CFA9, #5FBF98);
    --button-hover-background: linear-gradient(to right, #5FBF98, #3F8F6C);

    --primary-color: #5FBF98;
    --secondary-color: #78CFA9;
    --accent-color: #BFE6D2;

    --button-gradient-start: #78CFA9;
    --button-gradient-end: #5FBF98;

    --button-hover-gradient-start: #5FBF98;
    --button-hover-gradient-end: #3F8F6C;

    --modal-background: rgba(0, 0, 0, 0.5);

    --heading-color: #2C5F4A;
    --border-color: #BFE6D2;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* Тёмная тема */
html.dark-theme {
    --background-color: linear-gradient(to bottom, #2F5A47, #1F3F33);
    --background-image: url('/static/images/Pic3.png');

    --text-color: #EAF7F0;

    --card-background: rgba(31, 63, 51, 0.95);
    --container-background: rgba(31, 63, 51, 0.95);

    --nav-background: #1F3F33;
    --nav-text-color: #EAF7F0;

    --button-background: linear-gradient(to right, #4E8C6F, #3A6F57);
    --button-hover-background: linear-gradient(to right, #3A6F57, #2B4F3F);

    --primary-color: #6FBF97;
    --secondary-color: #4E8C6F;
    --accent-color: #2F5A47;

    --button-gradient-start: #4E8C6F;
    --button-gradient-end: #3A6F57;

    --button-hover-gradient-start: #3A6F57;
    --button-hover-gradient-end: #2B4F3F;

    --modal-background: rgba(0, 0, 0, 0.85);

    --heading-color: #8FCBAA;
    --border-color: #4E8C6F;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    background: var(--background-color);
    background-image: var(--background-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;

    font-family: 'Segoe UI', sans-serif;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

html {
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: 100px auto 60px auto;
    padding: 40px;
    background: var(--container-background);
    border-radius: 20px;
    box-shadow: 0 12px 30px var(--shadow-color);
    backdrop-filter: blur(2px);
    animation: fadeIn 0.8s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container h1 {
    font-size: 42px;
    font-family: 'Great Vibes', cursive;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 40px;
    font-weight: normal;
    letter-spacing: 1px;
}

.container h2 {
    font-size: 28px;
    margin-bottom: 20px;
    margin-top: 30px;
    color: var(--heading-color);
    border-left: 4px solid var(--primary-color);
    padding-left: 15px;
    font-weight: 600;
}

.container p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--text-color);
}

section {
    margin-bottom: 50px;
    padding: 20px;
    background: var(--card-background);
    border-radius: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

section img {
    max-width: 80%;
    height: auto;
    border-radius: 12px;
    margin: 20px auto;
    display: block;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: transform 0.3s ease;
    border: 2px solid var(--border-color);
}

section img:hover {
    transform: scale(1.02);
}

strong {
    color: var(--primary-color);
    font-weight: bold;
}

@media (max-width: 768px) {
    .container {
        margin: 80px 20px 40px 20px;
        padding: 20px;
    }

    .container h1 {
        font-size: 32px;
    }

    .container h2 {
        font-size: 24px;
    }

    .container p {
        font-size: 16px;
    }

    section img {
        max-width: 95%;
    }

    section {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 70px 15px 30px 15px;
        padding: 15px;
    }

    .container h1 {
        font-size: 28px;
    }

    .container h2 {
        font-size: 20px;
    }

    .container p {
        font-size: 14px;
    }
}

.container a {
    color: var(--primary-color);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.container a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.container ul, .container ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.container li {
    line-height: 1.8;
    margin-bottom: 10px;
}

.btn1 {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(to right, var(--button-gradient-start), var(--button-gradient-end));
    color: white;
    padding: 10px 15px;
    font-size: 15px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    border: none;
}

.btn1:hover {
    background: linear-gradient(to right, var(--button-hover-gradient-start), var(--button-hover-gradient-end));
    transform: translateY(-3px);
    box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.2);
}