/* this makes all elements include the padding and borders in the width */
* { box-sizing: border-box; }

body {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 300;
    color:#434343;
}

.container {
    width: 1000px;
    padding: 20px;
    margin: auto;
}

img {
    max-width: 100%;
    display: block;
}

/************ Typography rules ************/
h1, h2, h3 {
    font-weight: 700;
    margin: 0;
    padding: 0;
    margin-bottom: .5em;
    text-transform: capitalize;
}

h2 { font-size: 2em; text-align: center; }
h3 { font-size: 1.5em; }
p { line-height: 1.5rem;}

/************ Header rules ************/
header {
    background-color: gold;
    height: 250px;
}

header h1 {
    text-align: center;
    font-size: 2em;
    padding: 0;
    color: #fff;
    /* flex: 1; */
    width: 25%;
    align-self: center;
}

header .container {
    background-color: #d8ba12;
    height: 250px;
    padding: 0;
    display: flex;
}

header .info {
    background-color: #fde662;
    padding: 20px;
    flex: 3;
    /* display: flex; */
    width: 75%;
    flex-direction: column;
}

header button {
    background-color: darkblue;
    color: #fff;
    font-weight: 700;
    padding: 10px 20px;
    border-radius: 20px;
    margin: auto auto 0 auto;
}

/************ Navigation rules ************/
nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li a {
    display: block;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25em;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 5px 10px;
    text-align: center;
    color:darkblue;
    border-right: 2px solid darkblue;
}

nav ul li:nth-child(3) a {
    border: none;
}

nav ul li:last-of-type {
    margin-left: auto;
}

/************ Form rules ************/
header form {
    width: 250px;
    display: flex;
}

#search-field {
    padding: 10px 20px;
    border-top-left-radius: 20px;
    border-bottom-left-radius: 20px;
    border: 2px solid #ccc;
}

#search-button {
    flex: 1;
    border-top-right-radius: 20px;
    border-bottom-right-radius: 20px;
    border: 2px solid #ccc;
    background-color: #d8ba12;
}

/************ Top Section rules ************/
#top {
    background-color: #efefef;
}

#top ol {
    background-color: #d3d3d3;
    list-style-type: none;
    width: 1000px;
    margin: auto;
    padding: 30px 0;
    display: flex;
}

#top ol li {
    aspect-ratio: 1 / 1;
    text-align: center;
    /* flex: 1; */
    width: 25%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#top ol li:nth-child(1), #top ol li:nth-child(3) { background-color: hotpink;}
#top ol li:nth-child(2), #top ol li:nth-child(4) { background-color: #c31ef0;}

#top ol li a {
    text-align: center;
    font-size:1.5em;
    color: #fff;
    font-weight: 700;
    text-decoration: none;
}

/************ Keynote Section rules ************/
#keynote {
    background-color:#594c00;
}

#keynote .container {
    background-color: #413803;
    color: #fff;
    padding: 0;
}

#keynote .container article {
    display: flex;
}

#keynote .container article div {
    padding: 20px;
    /* flex: 3; */
    width: 75%;
}
#keynote article div p {
    font-size: 1.5em;
    line-height: 1.5em;
}
#keynote aside {
    background: gold;
    padding: 15px;
    color:#434343;
    /* flex: 1; */
    width: 25%;
}

/************ Schedule Section rules ************/
#schedule {
    background-color: #efefef;
    border-bottom: 30px solid #d3d3d3;
    padding: 20px;
}

#schedule .container{
    display: flex;
    justify-content: space-between;
}

#schedule .container div ol {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

#schedule .container div ol li {
    font-size: 1.2em;
    line-height: 1.7em;
}

/************ Info Section rules ************/
#info {
    padding: 20px;
}

#info .container {
    display: flex;
    gap: 2em;
    justify-content: space-between;
}

#info .container article {
    /* text-align: justify; */
    hyphens: auto;
    flex: 1;
}

#page-footer {
    border-top: 30px solid gold;
    background-color:#594c00;
    color: #fff;
    text-align: center;
    padding: 40px 0;
}