/* ===== base ===== */
.neckdisc{
  font-family: "Pretendard","Noto Sans KR",system-ui,-apple-system,sans-serif;
  color:#111;
  background:#fff;
}
.neckdisc-wrap{
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}
.neckdisc img{ display:block; width:100%; height:100%; object-fit:cover; }

/* ===== 1) hero title with long lines ===== */
.neckdisc-hero{
  padding: 100px 20px 18px;
  text-align:center;
}
.neckdisc-hero__container{
  max-width: 980px;
  margin: 0 auto;
  display:flex;
  align-items:center;
  gap: 18px;
  justify-content:center;
}
.neckdisc-hero__line{
  height: 2px;
  background:#2b2b2b;
  flex: 1 1 auto;
  opacity: 0.7;
}
.neckdisc-hero__title{
  margin: 0;
  font-size: 40px;
  font-weight: 800; /* ✅ 한 덩어리 굵기 통일 */
  letter-spacing: -0.02em;
}
.neckdisc-hero__desc{
  margin: 12px auto 0;
  max-width: 760px;
  font-size: 17px;
  line-height: 1.7;
  color:#333;
}

/* ===== cause ===== */
.neckdisc-cause{
  padding: 18px 0 40px;
}
.neckdisc-cause__grid{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
  align-items:start;
}
.neckdisc-cause__img{
  background:#f3f3f3;
  height: 320px;
  overflow:hidden;
}
.neckdisc-cause__box{
  padding-top: 10px;
}
.neckdisc-cause__title{
  margin: 0 0 12px;
  display:flex;
  align-items:center;
  gap: 12px;
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.neckdisc-cause__title-line{
  height: 2px;
  background:#bfbfbf;
  flex: 1 1 auto;
  transform: translateY(2px);
}
.neckdisc-cause__list{
  list-style:none;
  margin: 0;
  padding: 0;
  display:flex;
  flex-direction:column;
  gap: 8px;
}
.neckdisc-cause__list li{
  position:relative;
  padding-left: 20px;
  font-size: 17px;
  line-height: 1.4;
  color:#333;
}
.neckdisc-cause__list li::before{
  content:"";
  position:absolute;
  left:0;
  top: 4px;
  width: 17px;
  height: 17px;
  border-radius: 2px;
  background:#7fb100;
}
.neckdisc-cause__list li::after{
  content:"";
  position:absolute;
  left: 3px;
  top: 7px;
  width: 10px;
  height: 5px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}

/* ===== section title (uniform weight) ===== */
.neckdisc-sec-title{
  margin: 0 0 14px;
  text-align:center;
  font-size: 40px;
  font-weight: 800;  /* ✅ 한 덩어리 굵기 통일: '절차'만 굵어지는 식의 분리 금지 */
  letter-spacing:-0.02em;
}

/* ===== 2) symptom ===== */
.neckdisc-symptom{
  position:relative;
  padding: 70px 0 70px;
  overflow:hidden;
}
.neckdisc-symptom__bg{
  position:absolute;
  inset:0;
}
.neckdisc-symptom__bg::after{
  content:"";
  position:absolute;
  inset:0;
  background: rgba(255,255,255,0.8);
}
.neckdisc-symptom__inner{
  position:relative;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}
.neckdisc-symptom__grid{
  margin-top: 26px;
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.neckdisc-symptom-card{
  background:#fff;
  border: 1px solid #e9e9e9;
  box-shadow: 0 1px 0 rgba(0,0,0,0.03);
}
.neckdisc-symptom-card__img{
  height: 150px;
  background:#f2f2f2;
  overflow:hidden;
}
.neckdisc-symptom-card__txt{
  margin: 0;
  padding: 12px 10px 14px;
  text-align:center;
  font-size: 17px;
  line-height: 1.45;
  color:#333;
}

/* ===== 3) treat ===== */
.neckdisc-treat{
  padding: 62px 20px 80px;
}
.neckdisc-treat__head{
  position:relative;
  text-align:center;
  max-width: 980px;
  margin: 0 auto 18px;
}
.neckdisc-treat__watermark{
  margin-top: -60px;
  position:absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 92px;
  font-weight: 900;
  color: rgba(0,0,0,0.06);
  letter-spacing: 0.03em;
  user-select:none;
  pointer-events:none;
}
.neckdisc-sec-title--treat{
  margin-bottom: 10px;
}
.neckdisc-treat__sub{
  margin: 0;
  font-size: 17px;
  color:#333;
}
.neckdisc-treat__box{
  max-width: 1100px;
  margin: 18px auto 0;
  background:#fbfbf3;
  border: 1px solid #ececdf;
  border-radius: 12px;
  padding: 22px 18px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}

/* steps grid (8 items, 4x2) */
.neckdisc-steps{
  list-style:none;
  margin: 0;
  padding: 0;
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px 16px;
}
.neckdisc-step{
  text-align:center;
  position:relative;
  padding: 0 8px;
}

/* arrow between steps (only in desktop 4-col layout) */
.neckdisc-step:not(:nth-child(4)):not(:nth-child(8))::after{
  content:"";
  position:absolute;
  right: -8px;
  top: 46px;
  width: 16px;
  height: 1px;
  background:#d7d7d7;
}
.neckdisc-step:not(:nth-child(4)):not(:nth-child(8))::before{
  content:"";
  position:absolute;
  right: -4px;
  top: 42px;
  width: 0; height: 0;
  border-left: 6px solid #d7d7d7;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}

/* circle + badge */
.neckdisc-step__circle{
  width: 120px;
  height: 120px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background:#fff;
  border: 1px solid #dedede;
  display:flex;
  align-items:center;
  justify-content:center;
  position:relative;
}
.neckdisc-step__badge{
  position:absolute;
  top: -8px;
  right: 6px;
  background:#7fb100;
  color:#fff;
  font-weight: 900;
  font-size: 15px;
  padding: 5px 8px;
  border-radius: 999px;
}
.neckdisc-step__icon{
  width: 40px !important;
  height: 40px !important;
  object-fit:contain;
}
.neckdisc-step__name{
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 6px;
}
.neckdisc-step__desc{
  font-size: 17px;
  line-height: 1.6;
  color:#444;
}

/* ===== responsive ===== */
@media (max-width: 1024px){
  .neckdisc-cause__grid{
    grid-template-columns: 1fr 1fr;
  }
  .neckdisc-symptom__grid{
    grid-template-columns: repeat(2, 1fr);
  }
  .neckdisc-steps{
    grid-template-columns: repeat(2, 1fr);
  }

  /* 2열에서는 화살표 제거 */
  .neckdisc-step::after,
  .neckdisc-step::before{
    content:none !important;
  }
}

@media (max-width: 720px){
  .neckdisc-hero__container{
    gap: 12px;
  }
  .neckdisc-hero__title{
    font-size: 24px;
  }
  .neckdisc-cause__grid{
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .neckdisc-cause__img{
    height: 210px;
  }
  .neckdisc-sec-title{
    font-size: 22px;
  }
  .neckdisc-treat__watermark{
    font-size: 72px;
    top: 28px;
  }
}

@media (max-width: 520px){
  .neckdisc-symptom__grid{
    grid-template-columns: 1fr;
  }
  .neckdisc-steps{
    grid-template-columns: 1fr;
  }
}