@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css");

::selection {
  color: #8ce2ff;
  background-color: #F25100;
}

body {
  margin: 0;
  background-color: #8ce2ff;
  height: 100vh;
  overflow: hidden;
  font-family: Pretendard, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  font-weight: 400;
  font-size: 16px;
  word-break: keep-all;
}

body.sub {
  background-color: #ffffff;
}

body a {
  text-decoration: none;
}

.main-container {
  display: grid;
  grid-template-columns: 20% 80%;
  height: 100vh;
  box-sizing: border-box;
}

.left {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  text-align: left;
  color: #f25100;
  box-sizing: border-box;
  height: 100%;
  border-right: 1px solid #f25100;
}

.left h1 {
  width: 100%;
  margin: 0;
  border-bottom: 1px solid #f25100;
  padding: 20px;
  box-sizing: border-box;
}

.left h1 span {
  display: inline-block;
  color: #f25100;
  font-size: 32px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.diamond-colon {
  width: 7px;
  height: 18px;
  margin-left: 8px;
  position: relative;
  margin-bottom: 2px;
}

.diamond-colon::before,
.diamond-colon::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 5px;
  height: 5px;
  background-color: #f25100;  /* 원하는 색상 */
  transform: translateX(-50%) rotate(45deg);
}

/* 위쪽 다이아몬드 */
.diamond-colon::before {
  top: 0;
}

/* 아래쪽 다이아몬드 */
.diamond-colon::after {
  bottom: 0;
}

.header {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
}

.header li {
  font-size: 32px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: -0.025em;
  color: #f25100;
  padding: 10px 20px;
  border-bottom: 1px solid #f25100;
}

.header li a {
  color: #f25100;
  display: block;
}

.header li:hover {
  background-color: #f25100;
}

.header li:hover a {
  color: #8ce2ff;
}

.header.sub li:hover {
  background-color: #8ce2ff;
}

.header.sub li:hover a {
  color: #f25100;
}

.header.sub li.on {
  background-color: #8ce2ff;
}

.footer {
  font-size: 13px;
  line-height: 1.5;
  font-weight: 300;
  margin-top: auto;
  width: 100%;
  list-style: none;
  padding: 20px;
  box-sizing: border-box;
}

.footer p {
 margin: 0 0 24px 0; 
}

.footer p span {
  letter-spacing: -0.025em;
  display: block;
}

.footer ul.link-icon {
  display: flex;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer ul.link-icon li{
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.footer ul.link-icon li a {
  display: inline-flex;
  width: 24px;
  height: 24px;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: inherit;
}

.right {
  padding: 15px;
  box-sizing: border-box;
  overflow: hidden;
  position: relative;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(32px, 1fr)); /* 최소 32px */
  grid-gap: 8px;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

.square {
  background-color: #8ce2ff;
  aspect-ratio: 1 / 1;
  cursor: pointer;
  position: relative;
  border: 1px solid transparent;
  box-sizing: border-box;
  animation-name: colorFlip;
  animation-duration: 12s;  /* 전체 애니메이션 시간 */
  animation-timing-function: steps(2, end); /* 2단계로 딱 끊기게 */
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
  will-change: transform, opacity;
}

@keyframes colorFlip {
  0%, 50% {
    background-color: #8ce2ff;
  }
  51%, 100% {
    background-color: #f25100;
  }
}

.square.hover {
  background-color: #8ce2ff !important;
  border-color: #f25100;  /* 투명→주황색 단일 컬러 전환 */
  transform: rotate(45deg) scale(0.9);
  transition:
    transform 0.3s ease,
    background-color 0.3s ease,
    border-color 0.3s ease;
}

/* 내부 작은 마름모 박스 크기를 85%로 변경 */
.square.hover::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 85%;  /* 가로 85% */
  height: 85%; /* 세로 85% */
  background-color: #f25100;
  transform: translate(-50%, -50%) rotate(-45deg);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  box-sizing: border-box;
  border-radius: 2px;
  pointer-events: none;
}