/* font */
@import url("https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New&display=swap");

body {
  font-family: "Zen Kaku Gothic New", sans-serif;
}

:root {
  --character-width: 0.62em;
  --content-width: 1024px;

  --size: 32px;
  --padding: calc(var(--size) * 0.62);

  --border: 2px;
  --border-radius: calc(var(--size) * 0.19);
  --min-font-size: calc(var(--size) * (1.62 / 3.62));
  --max-font-size: calc(var(--min-font-size) * 1.62);

  --header: calc(var(--size) + var(--padding) * 2);

  --black: #000000;
  --dark-gray: #3f3f3f;
  --gray: #7f7f7f;
  --white: #dfdfdf;
  --red: #df0000;
  --yellow: #dfbf00;
}

/* element */
* {
  padding: 0;
  margin: 0;
}

a {
  color: inherit;
}

body {
  background-color: var(--black);
  color: var(--white);
  font-family: sans-serif;
}

button {
  height: var(--size);
  padding: 0 var(--padding);

  background-color: transparent;
  border: var(--border) solid var(--white);
  border-radius: var(--border-radius);
  box-sizing: border-box;
  color: inherit;
  font-family: inherit;
  font-size: var(--min-font-size);
  transition: all 0.06s;

  &:active {
    background-color: var(--gray);
  }

  &:hover {
    opacity: 62%;
  }

  &.big {
    height: auto;
    padding: var(--border-radius) calc(var(--padding) + var(--border-radius));
  }

  &.reverse {
    background-color: var(--white);
    color: var(--black);
  }

  &.selected {
    border-width: calc(var(--border) * 2);
  }
}

h1,
h2,
h3 {
  font-size: var(--max-font-size);
}

img {
  display: block;

  width: 100%;

  border-radius: var(--border-radius);
}

input {
  height: calc(var(--size) - var(--border));
  width: 100%;
  padding: 0 var(--padding);

  background-color: transparent;
  border: none;
  border-bottom: var(--border) solid var(--white);
  box-sizing: content-box;
  color: inherit;
  font-family: inherit;
  font-size: var(--min-font-size);
  outline: none;

  &::placeholder {
    color: var(--gray);
  }
}

p {
  line-height: var(--size);
}

/* header */
header,
.header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;

  height: var(--size);
  width: calc(100% - var(--padding) * 2);
  padding: var(--padding);

  position: fixed;
  top: 0;
  left: 0;

  > a:first-child > img,
  > img:first-child {
    height: var(--size);
  }

  > #account {
    width: var(--size);
    padding: 0;

    border-color: var(--dark-gray);
    border-radius: 50%;

    &.logined {
      border-color: var(--white);
    }
  }

  > div:last-child {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--padding);
  }
}

/* main */
main {
  display: flex;
  flex-direction: row;
  justify-content: center;

  min-height: calc(100vh - var(--header) - var(--padding) * 2 - var(--size));
  margin: var(--padding);
  margin-top: calc(var(--header) + var(--padding));

  > #contents {
    display: flex;
    flex-direction: column;
    gap: var(--size);

    max-width: var(--content-width);
  }

  > .log {
    display: flex;
    flex-direction: row;
    align-items: center;

    height: var(--size);
    width: calc(100% - var(--padding) * 2);
    padding: var(--padding);

    background-color: var(--red);

    position: fixed;
    top: 0;
    left: 0;
  }
}

/* footer */
footer {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;

  height: var(--size);
  padding: 0 var(--padding);

  font-size: calc(var(--min-font-size) * 0.62);

  &:has(> div:only-child) {
    justify-content: center;
  }
}

/* arrangement */
.center {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
}

.horizontal-between {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

/* font-color */
.dark-gray {
  color: var(--dark-gray);
}

.red {
  color: var(--red);
}

.yellow {
  color: var(--yellow);
}

/* font-weight */
.bold {
  font-weight: bold;
}

/* gap */
.gap {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--padding);
}

/* indent */
.indent {
  padding-left: var(--padding);
}

/* padding */
.padding {
  display: flex;
  flex-direction: column;
  gap: var(--padding);
}