:root {
    --color-button-highlight: #ffa819;
    --color-key-highlight: #ffdfab;
    --color-light-gray: rgb(188, 188, 188);
}

body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Source Sans Pro', serif;
    background-color: #ebebeb;
    -webkit-font-smoothing: antialiased;
}

input {
    font-family: 'Source Sans Pro', serif;
}

h1 {
    font-family: 'Roboto Slab', serif;
    font-weight: 500;
}

p {
    line-height: 1.35;
}

.page {
    display: flex;
    align-items: center;
    height: 100%
}

.container {
    display: flex;
    flex-direction: row;
    width: 60%;
    margin: auto;
}

.column {
    display: flex;
    flex-direction: column;
}

.box {
    flex: auto;
    padding: 20px;
    border-radius: 6px;
    margin: 10px;
    background-color: white;
    box-sizing: border-box;
}

.page-content {
    width: 70%;
    height: 300px;
}

.sidebar {
    flex-grow: 1;
    height: 0%;
    width: 30%;
}

#piano {
    display: flex;
    min-width: 350px;
    max-width: 700px;
    margin: 20px auto;
    height: 175px;
    padding: 0;
}

.key {
    flex: 1;
    position: relative;
    list-style-type: none;
    border-right: 1px solid var(--color-light-gray);
    border-top: 1px solid var(--color-light-gray);
    border-bottom: 1px solid var(--color-light-gray);
    border-radius: 0 0 5px 5px;
    box-shadow: 0 5px rgb(210, 210, 210);
}

.white-key {
    height: 100%;
    z-index: 1;
}

.black-key {
    position: absolute;
    top: 0px;
    height: 60%;
    width: 50%;
    background-color: #111111;
    border-radius: 0 0 5px 5px;
    box-shadow: 0px 4px rgb(32 32 32 / 20%);
    z-index: 2;
}

#piano > .key:first-child {
    border-bottom-left-radius: 0px;
    border-left: 1px solid var(--color-light-gray);
}

#piano > .key:last-child {
    border-bottom-right-radius: 0px;
}

.key-short {
    left: 67%;
}

.key-mid {
    left: 75%;
}

.key-far {
    left: 83%;
}

.key-highlight {
    animation: highlight 1.0s forwards;
}

.key-unhighlight {
    animation: unhighlight 1.0s forwards;
}

.key-highlighted {
    background-color: var(--color-key-highlight);
}

.piano-box {
    overflow-x: auto;
}

.input-box {
    text-align: center;
}

.status-box {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.input-dialog {
    display: flex;
    margin-bottom: 20px;
    align-items: center;
    justify-content: center;
}

#note-input {
    border-radius: 5px;
    border: 1px solid var(--color-light-gray);
    height: 25px;
    padding: 3px;
    text-align: center;
    width: 60px;
}

#note-submit-button {
    margin-left: 10px;
    border-bottom: 1px solid var(--color-light-gray);
    margin-bottom: 10px;
    padding: 5px;
    cursor: pointer;
    user-select: none;
}

#status-display {
    display: flex;
    align-items: center;
    justify-content: center;
}

#status-note {
    border-right: 1px solid var(--color-light-gray);
    color: var(--color-light-gray);
    text-align: center;
    padding: 16px;
    width: 30%;
    margin: 0;
}

#status-info {
    padding: 16px;
    margin: 0;
    width: 50%;
}

@media only screen and (max-width: 1300px) {
    .question-title {
        font-size: 1.7em;
    }
    .container {
        flex-direction: column;
        width: 70%;
    }
    .column {
        flex-direction: row;
        width: 100%;
    }
    .input-box {
        width: 40%
    }
    .status-box {
        width: 60%;
        height: 100%;
        align-self: end;
        -webkit-align-self: end;
    }
}

@media only screen and (max-width: 700px) {
    .container {
        width: 100%;
    }
    .piano-box {
        padding: 20px 0;
    }
}

@media only screen and (max-width: 450px) {
    #status-display {
        flex-direction: column;
    }
    #status-note {
        border-right: 0;
        border-bottom: 1px solid var(--color-light-gray);
        width: 50%
    }
    #status-info {
        text-align: center;
        width: 100%;
    }
    .input-box {
        width: 50%
    }
    .key {
        border-radius: 0 0 4px 4px;
    }
    .black-key {
        border-radius: 0 0 4px 4px;
    }
}

@keyframes highlight {
    from { background-color: none; }
    to { background-color: var(--color-key-highlight); }
}

@keyframes unhighlight {
    from { background-color: var(--color-key-highlight); }
    to { background-color: none; }
}