Heading 12

<h2 class="heading-border-left">見出しテキスト</h2>

/* reset */
:where(h2).heading-border-left {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-border-left {
  --heading-accent: #2b36f5;
  --heading-color: #364153;

  padding-left: 12px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);
  border-left: 4px solid var(--heading-accent);
}

<h2 class="heading-square-left">見出しテキスト</h2>

/* reset */
:where(h2).heading-square-left {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-square-left {
  --heading-accent: #2b36f5;
  --heading-color: #364153;

  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::before {
    flex-shrink: 0;
    width: 12px;
    height: 12px;
    content: "";
    background-color: var(--heading-accent);
  }
}

<h2 class="heading-line-left">見出しテキスト</h2>

/* reset */
:where(h2).heading-line-left {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-line-left {
  --heading-color: #364153;
  --heading-line-color: #e7e7e7;
  --heading-line-width: 2rem;

  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::before {
    flex-shrink: 0;
    width: var(--heading-line-width);
    height: 1px;
    content: "";
    background-color: var(--heading-line-color);
  }
}

<h2 class="heading-line-right">見出しテキスト</h2>

/* reset */
:where(h2).heading-line-right {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-line-right {
  --heading-color: #364153;
  --heading-line-color: #e7e7e7;

  display: flex;
  gap: 1.5rem;
  align-items: center;
  width: 100%;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::after {
    flex: 1;
    height: 1px;
    content: "";
    background-color: var(--heading-line-color);
  }
}

<h2 class="heading-line-center">見出しテキスト</h2>

/* reset */
:where(h2).heading-line-center {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-line-center {
  --heading-color: #364153;
  --heading-line-color: #e7e7e7;

  display: flex;
  gap: 1.5rem;
  align-items: center;
  width: 100%;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::before,
  &::after {
    flex: 1;
    height: 1px;
    content: "";
    background-color: var(--heading-line-color);
  }
}

<h2 class="heading-underline-gradient">見出しテキスト</h2>

/* reset */
:where(h2).heading-underline-gradient {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-underline-gradient {
  --heading-color: #364153;
  --heading-underline-width: 80px;
  --heading-underline-height: 3px;
  --heading-underline-gradient-start: #2b36f5;
  --heading-underline-gradient-middle: #7c3aed;
  --heading-underline-gradient-end: #d946ef;

  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);
  text-align: center;

  &::after {
    display: block;
    width: var(--heading-underline-width);
    height: var(--heading-underline-height);
    margin-inline: auto;
    margin-top: 10px;
    content: "";
    background: linear-gradient(
      in oklch to right,
      var(--heading-underline-gradient-start),
      var(--heading-underline-gradient-middle),
      var(--heading-underline-gradient-end)
    );
  }
}

<h2 class="heading-underline-dotted">見出しテキスト</h2>

/* reset */
:where(h2).heading-underline-dotted {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-underline-dotted {
  --heading-accent: #2b36f5;
  --heading-color: #364153;
  --heading-line-width: 1px;

  width: 100%;
  padding-bottom: 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-accent);
  border-bottom: var(--heading-line-width) dashed var(--heading-color);
}

<h2 class="heading-underline-accent-left">見出しテキスト</h2>

/* reset */
:where(h2).heading-underline-accent-left {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-underline-accent-left {
  --heading-color: #364153;
  --heading-accent: #2b36f5;
  --heading-line-color: #e7e7e7;
  --heading-accent-width: 40px;
  --heading-accent-height: 2px;

  position: relative;
  width: 100%;
  padding-bottom: 12px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);
  border-bottom: var(--heading-accent-height) solid var(--heading-line-color);

  &::after {
    position: absolute;
    bottom: calc(var(--heading-accent-height) * -1);
    left: 0;
    width: var(--heading-accent-width);
    height: var(--heading-accent-height);
    content: "";
    background-color: var(--heading-accent);
  }
}

<h2 class="heading-underline-balloon">
  <span class="heading-underline-balloon__text">見出しテキスト</span>
</h2>

/* reset */
:where(h2).heading-underline-balloon {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-underline-balloon {
  --heading-color: #2b36f5;
  --heading-balloon-tail-size: 16px;

  position: relative;
  display: inline-block;
  padding-bottom: 8px;
  margin-bottom: calc(var(--heading-balloon-tail-size) / 1.5);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::before,
  &::after {
    position: absolute;
    bottom: 0;
    height: 1px;
    content: "";
    background-color: var(--heading-color);
  }

  &::before {
    left: 0;
    width: calc(40% - var(--heading-balloon-tail-size));
  }

  &::after {
    right: 0;
    width: 60%;
  }
}

.heading-underline-balloon__text {
  display: inline-block;

  &::before {
    position: absolute;
    bottom: 0;
    left: calc(40% - var(--heading-balloon-tail-size));
    width: var(--heading-balloon-tail-size);
    height: 1px;
    content: "";
    background-color: var(--heading-color);
    transform: rotate(-45deg);
    transform-origin: right;
  }
}

<h2 class="heading-balloon">見出しテキスト</h2>

/* reset */
:where(h2).heading-balloon {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-balloon {
  --heading-bg: #2b36f5;
  --heading-color: #fff;
  --heading-tail-width: 12px;
  --heading-tail-height: 8px;

  position: relative;
  display: inline-block;
  padding: 8px 16px;
  margin-bottom: var(--heading-tail-height);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);
  background-color: var(--heading-bg);
  border-radius: 4px;

  &::after {
    position: absolute;
    bottom: calc(var(--heading-tail-height) * -1);
    left: 50%;
    width: var(--heading-tail-width);
    height: var(--heading-tail-height);
    content: "";
    background-color: var(--heading-bg);
    clip-path: polygon(50% 100%, 0 0, 100% 0);
    translate: -50% 0;
  }
}

<h2 class="heading-slash">見出しテキスト</h2>

/* reset */
:where(h2).heading-slash {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-slash {
  --heading-color: #364153;
  --heading-slash-gap: 12px;
  --heading-slash-angle: 32deg;

  display: inline-flex;
  gap: var(--heading-slash-gap);
  align-items: center;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--heading-color);

  &::before,
  &::after {
    flex-shrink: 0;
    width: 1px;
    height: 1.2em;
    content: "";
    background-color: var(--heading-color);
  }

  &::before {
    transform: rotate(calc(var(--heading-slash-angle) * -1));
  }

  &::after {
    transform: rotate(var(--heading-slash-angle));
  }
}

<h2 class="heading-vertical">
  <span class="heading-vertical__en">HEADING TEXT</span>
  <span class="heading-vertical__text">見出しテキスト</span>
</h2>

/* reset */
:where(h2).heading-vertical {
  margin: 0;
  font: inherit;
}

/* snippet */
.heading-vertical {
  --heading-accent: #2b36f5;
  --heading-color: #364153;

  display: inline-flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
  font-weight: 700;
  writing-mode: vertical-rl;
}

.heading-vertical__text {
  font-size: 18px;
  line-height: 1.8;
  color: var(--heading-color);
  letter-spacing: 0.1em;
}

.heading-vertical__en {
  font-size: 11px;
  line-height: 1;
  color: var(--heading-accent);
  letter-spacing: 0.15em;
}