html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    overflow-y: auto;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    font-family: 'Montserrat', sans-serif;
    line-height: 1.7;
    color: #333;
    min-height: 100vh;
    user-select: none;
    padding-top: var(--window-top-margin);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
    text-decoration: none !important;
}

h3 {
    color: rgba(58, 0, 231, 0.6);
    position: relative;
    display: inline-block;
    transition: all var(--transition-speed) ease;
}

h3:hover {
    transform: scale(var(--hover-scale));
    color: rgb(58, 0, 231);
}

h3 a, a h3 {
    text-decoration: none !important;
    border-bottom: none !important;
}
/* Sberbank donation section */
.sberbank-donate {
    position: fixed;
    top: 20px;
    left: 25px;
    z-index: 1000;
}

/* Donation button */
.sber-donate-btn {
    background: linear-gradient(90deg, #21a038, #1c8e33);
    color: #fff;
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.8rem 0.2rem;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 10px rgba(33, 160, 56, 0.4);
    transition: all 0.3s ease;
}

/* Hover & active effects */
.sber-donate-btn:hover {
    background: linear-gradient(90deg, #26c043, #1cae3b);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(33, 160, 56, 0.5);
}

.sber-donate-btn:active {
    transform: translateY(0);
    box-shadow: 0 3px 8px rgba(33, 160, 56, 0.4);
}