/* =========================
   GLOBAL (Dark tone base)
   ========================= */

:root{
  --bg: #0b0f17;
  --bg-2: #0f1626;
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.70);
  --dim: rgba(255,255,255,0.58);
  --border: rgba(255,255,255,0.10);
  --border-2: rgba(255,255,255,0.14);
  --shadow: 0 18px 60px rgba(0,0,0,0.40);
}

/* Reset */
*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 700px at 15% 10%, rgba(255,255,255,0.06), transparent 55%),
              radial-gradient(900px 600px at 90% 20%, rgba(255,255,255,0.05), transparent 55%),
              linear-gradient(180deg, var(--bg), var(--bg-2));
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Apple SD Gothic Neo",
               "Noto Sans KR", "Malgun Gothic", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a{ color: inherit; }
img{ max-width: 100%; display: block; }

/* =========================
   SEO SUBPAGE – Premium Minimal (Dark)
   (HTML 구조 변경 없음 / .seo-*만 스타일)
   ========================= */

.seo-page{
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 20px 92px;
}

.seo-hero{
  border-radius: 18px;
  padding: 46px 32px;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.seo-h1{
  margin: 0 0 14px;
  font-size: clamp(26px, 3.1vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.035em;
  font-weight: 800;
}

.seo-lead{
  margin: 0;
  margin-top: 10px;
  max-width: 900px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.seo-cta{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

/* Buttons */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.015em;
  border: 1px solid var(--border-2);
  background: rgba(255,255,255,0.05);
  color: var(--text);
  transition: transform .18s ease, background .18s ease, border-color .18s ease, opacity .18s ease;
  will-change: transform;
}

.btn:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.22);
}

.btn:active{
  transform: translateY(0);
  opacity: 0.92;
}

.btn.primary{
  background: rgba(255,255,255,0.10);
  border-color: rgba(255,255,255,0.24);
}

.btn.primary:hover{
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.30);
}

.btn.ghost{
  background: transparent;
}

/* Badges */
.seo-badges{
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.seo-badges li{
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(0,0,0,0.18);
  color: var(--dim);
  font-size: 12.5px;
  letter-spacing: -0.01em;
}

/* Sections */
.seo-section{
  margin-top: 42px;
  padding-top: 6px;
}

.seo-section h2{
  margin: 0 0 14px;
  font-size: 20px;
  letter-spacing: -0.03em;
  font-weight: 800;
}

.seo-section p{
  margin: 0 0 12px;
  line-height: 1.9;
  color: var(--muted);
}

/* Grid / Cards */
.seo-grid{
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.seo-card{
  border-radius: 14px;
  padding: 18px 18px 16px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.035);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.seo-card:hover{
  transform: translateY(-1px);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.045);
}

.seo-card h3{
  margin: 0 0 8px;
  font-size: 15.5px;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.seo-card p{
  margin: 0;
}

/* Compare */
.seo-compare{
  margin: 12px 0 10px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.seo-compare-box{
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.035);
}

.seo-compare-box h3{
  margin: 0 0 8px;
  font-size: 15.5px;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.seo-note{
  margin-top: 12px;
  color: var(--muted);
}

/* List boxes */
.seo-list-box{
  margin-top: 14px;
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.035);
}

.seo-list-title{
  margin: 0 0 10px;
  font-weight: 850;
  letter-spacing: -0.02em;
  color: var(--text);
}

.seo-list,
.seo-fit{
  margin: 0;
  padding-left: 18px;
  line-height: 2.0;
  color: var(--muted);
}

.seo-list li strong{
  color: var(--text);
  font-weight: 800;
}

/* Final */
.seo-final{
  margin-top: 52px;
  padding: 26px 20px 22px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.14);
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
}

/* Responsive */
@media (max-width: 860px){
  .seo-page{
    padding: 50px 20px 72px;
  }
  .seo-hero{
    padding: 36px 18px;
  }
  .seo-grid{
    grid-template-columns: 1fr;
  }
  .seo-compare{
    grid-template-columns: 1fr;
  }
}


/* =========================
   Side Menu (SEO subpage)
   ========================= */

.side-menu{
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}

/* 기존 .btn 스타일과 어울리게 “심플/고급” 톤 */
.side-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
  padding: 11px 14px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 780;
  letter-spacing: -0.02em;

  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.92);

  box-shadow: 0 12px 34px rgba(0,0,0,0.35);
  backdrop-filter: blur(10px);

  cursor: pointer;
  user-select: none;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, opacity .18s ease;
}

.side-btn:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,0.09);
  border-color: rgba(255,255,255,0.26);
}

.side-btn:active{
  transform: translateY(0);
  opacity: 0.92;
}

/* 스크롤 따라 “움직이는” 버튼: JS가 translateY를 계속 업데이트 */
.side-btn--move{
  will-change: transform;
}

/* 모바일에서는 너무 튀면 폭 줄이기 */
@media (max-width: 860px){
  .side-menu{
    right: 12px;
  }
  .side-btn{
    min-width: 120px;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 13px;
  }
}
/* =========================================
   Premium Official Button (only)
   - HTML 구조 변경 없음
   - .side-menu 안의 첫 번째 링크(공식홈페이지)만 고급 스타일
   ========================================= */

.side-menu .side-btn{
  position: relative;
  overflow: hidden;
}

/* "공식홈페이지" 링크만 타겟 (a태그) */
.side-menu a.side-btn{
  min-width: 152px;
  padding: 12px 14px;
  border-radius: 14px;

  border: 1px solid rgba(255,255,255,0.18);
  background:
    radial-gradient(120px 60px at 18% 18%, rgba(255,255,255,0.14), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,0.09), rgba(255,255,255,0.04));
  box-shadow:
    0 18px 44px rgba(0,0,0,0.46),
    inset 0 1px 0 rgba(255,255,255,0.10);

  color: rgba(255,255,255,0.93);
  font-weight: 820;
  letter-spacing: -0.02em;

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);

  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}

/* 상단의 얇은 하이라이트 라인 */
.side-menu a.side-btn::before{
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 8px;
  height: 1px;
  background: rgba(255,255,255,0.16);
  opacity: 0.9;
}

/* 은은한 스윕(빛) */
.side-menu a.side-btn::after{
  content: "";
  position: absolute;
  top: -40%;
  left: -50%;
  width: 60%;
  height: 180%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.14), transparent);
  transform: rotate(18deg);
  opacity: 0;
  transition: opacity .25s ease, transform .25s ease;
}

/* 텍스트 앞에 작은 포인트(아이콘 느낌) */
.side-menu a.side-btn{
  gap: 8px;
}
.side-menu a.side-btn::marker{ content: ""; } /* 안전 */
.side-menu a.side-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.side-menu a.side-btn span{ display: inline-flex; }

/* hover */
.side-menu a.side-btn:hover{
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.28);
  box-shadow:
    0 22px 60px rgba(0,0,0,0.54),
    inset 0 1px 0 rgba(255,255,255,0.12);
  background:
    radial-gradient(140px 70px at 18% 18%, rgba(255,255,255,0.18), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,0.11), rgba(255,255,255,0.045));
}

.side-menu a.side-btn:hover::after{
  opacity: 1;
  transform: translateX(30%) rotate(18deg);
}

/* active(클릭 눌림) */
.side-menu a.side-btn:active{
  transform: translateY(-1px);
  box-shadow:
    0 16px 42px rgba(0,0,0,0.48),
    inset 0 1px 0 rgba(255,255,255,0.10);
}

/* 접근성: 포커스 링 */
.side-menu a.side-btn:focus-visible{
  outline: none;
  box-shadow:
    0 22px 60px rgba(0,0,0,0.54),
    0 0 0 3px rgba(255,255,255,0.14),
    inset 0 1px 0 rgba(255,255,255,0.12);
}

/* 모바일에서 살짝 컴팩트 */
@media (max-width: 860px){
  .side-menu a.side-btn{
    min-width: 136px;
    padding: 11px 12px;
    border-radius: 13px;
    font-size: 13px;
  }
}