/* 색상표: 다크 거래소형. 포인트는 테더 그린, 가격은 국내 거래소 관례대로 오르면 빨강·내리면 파랑 */
:root {
  --bg: #0b0e11;
  --surface: #181a20;
  --surface-2: #1e2329;
  --text: #eaecef;
  --text-2: #9aa3ae;
  --border: #2b3139;
  --brand: #2ebd85;
  --accent: #2ebd85;
  --up: #f6465d;
  --down: #3a7bfd;
  --good: #2ebd85;
  --radius: 14px;
  --shadow: none;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  word-break: keep-all;
}

a { color: var(--accent); }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* 헤더 · 푸터 */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 60px;
  flex-wrap: wrap;
}
.logo {
  font-weight: 800;
  font-size: 19px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--brand); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 15px;
  padding: 6px 10px;
  border-radius: 8px;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }

.site-footer {
  margin-top: 56px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--text-2);
  font-size: 14px;
}
.site-footer nav { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 10px; }
.site-footer a { color: var(--text-2); }
.site-footer p { margin: 4px 0; }

/* 공통 블록 */
main { padding-top: 28px; }
h1 { font-size: 26px; line-height: 1.35; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 { font-size: 20px; margin: 36px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 8px; }
.lead { color: var(--text-2); margin: 0 0 20px; }
.snapshot:empty { display: none; }

/* 히어로 */
/* 히어로는 라이트·다크 모드와 상관없이 코인 거래소풍 어두운 배경에 테더 그린 포인트 */
.card.hero {
  --hero-bg: #181a20;
  --hero-text: #f3f6fb;
  --hero-text-2: #9aa7bd;
  --hero-line: rgba(255, 255, 255, 0.1);
  --hero-green: #2fbf8f;
  --hero-up: #ff5a60;
  --hero-down: #5b9dff;
  padding: 30px 28px 26px;
  margin-bottom: 16px;
  color: var(--hero-text);
  border: 1px solid var(--border);
  background:
    radial-gradient(560px 280px at 95% 0%, rgba(38, 161, 123, 0.28), transparent 70%),
    var(--hero-bg);
}
.hero .eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--hero-green);
  background: rgba(38, 161, 123, 0.14);
  border: 1px solid rgba(38, 161, 123, 0.4);
  border-radius: 999px;
  padding: 3px 10px;
  margin: 0;
  letter-spacing: 0;
}
.slogan { font-size: 36px; font-weight: 800; line-height: 1.28; letter-spacing: -0.03em; margin: 14px 0 0; }
.slogan-sub { font-size: 16px; color: var(--hero-text-2); margin: 10px 0 0; }
.hero-live { border-top: 1px solid var(--hero-line); margin-top: 24px; padding-top: 18px; }
.hero-label { font-size: 14px; color: var(--hero-text-2); display: flex; align-items: center; gap: 8px; }
.hero-time { font-size: 13px; color: var(--hero-green); display: inline-flex; align-items: center; gap: 5px; }
.hero-time:not(:empty)::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--hero-green); box-shadow: 0 0 0 3px rgba(38, 161, 123, 0.25); }
.hero .hero-num.up { color: var(--hero-up); }
.hero .hero-num.down { color: var(--hero-down); }
.hero-diff strong { color: #fff; }
.hero-row { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-top: 2px; }
.hero-num { font-size: 60px; font-weight: 800; line-height: 1.1; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.hero-diff { font-size: 17px; }
.hero-diff strong { font-weight: 700; }
.hero-diff { color: var(--hero-text); }
.muted { color: var(--text-2); }
.small { font-size: 14px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* 요약 지표 */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.stat .label { font-size: 14px; font-weight: 600; color: #c7cdd6; }
.stat .value { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; white-space: nowrap; color: #fff; }
.stat .sub { font-size: 14px; font-weight: 600; color: var(--brand); font-variant-numeric: tabular-nums; margin-top: 2px; }

/* 시세표 */
.table-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.table-head h2 { margin: 0; }
.refresh { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-2); }
.btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 12px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { border-color: var(--text-2); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); display: inline-block; }
.dot.stale { background: var(--text-2); }

.table-scroll { overflow-x: auto; }
table.rates { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.rates th, .rates td { padding: 12px 10px; text-align: right; white-space: nowrap; }
.rates th:first-child, .rates td:first-child { text-align: left; }
.rates thead th { font-size: 13px; color: var(--text-2); font-weight: 500; border-bottom: 1px solid var(--border); }
.rates tbody tr + tr td { border-top: 1px solid var(--border); }
.rates td.ex a { color: var(--text); font-weight: 600; text-decoration: none; }
.rates td.ex a:hover { text-decoration: underline; }
.up { color: var(--up); }
.down { color: var(--down); }
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 6px;
  margin-left: 6px;
  vertical-align: 2px;
}
.badge.buy { background: rgba(26, 158, 92, 0.12); color: var(--good); }
.badge.sell { background: rgba(229, 56, 59, 0.12); color: var(--up); }
.note { font-size: 13px; color: var(--text-2); margin: 12px 0 0; }

/* 계산기 */
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.field label { font-size: 14px; color: var(--text-2); }
.field input, .field select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
  font-variant-numeric: tabular-nums;
  width: 100%;
}
.field input:focus, .field select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.result {
  background: var(--surface-2);
  border-radius: 10px;
  padding: 12px 14px;
  font-variant-numeric: tabular-nums;
}
.result strong { font-size: 22px; display: block; }

/* 본문 글 */
.prose { max-width: 720px; }
.prose p, .prose li { color: var(--text); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 4px 0; }
.prose .formula {
  background: var(--surface-2);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 15px;
  overflow-x: auto;
}
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.prose th { background: var(--surface-2); }
.prose details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.prose summary { font-weight: 600; cursor: pointer; }
.prose details p { margin: 8px 0 0; }
.callout {
  border-left: 3px solid var(--accent);
  background: var(--surface-2);
  padding: 12px 16px;
  border-radius: 0 10px 10px 0;
  margin: 16px 0;
}
.guide-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.guide-links a { text-decoration: none; color: var(--text); }
.guide-links a strong { display: block; margin-bottom: 4px; }
.guide-links a span { font-size: 14px; color: var(--text-2); }
.guide-links a:hover { border-color: var(--accent); }

@media (max-width: 720px) {
  h1 { font-size: 22px; }
  .card.hero { padding: 22px 18px 20px; }
  .slogan { font-size: 26px; }
  .slogan-sub { font-size: 15px; }
  .hero-num { font-size: 46px; }
  .hero-diff { font-size: 15px; }
  .stats { grid-template-columns: 1fr; gap: 8px; }
  .stat {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas: "label value" "sub value";
    align-items: center;
    padding: 12px 16px;
  }
  .stat .label { grid-area: label; }
  .stat .sub { grid-area: sub; }
  .stat .value { grid-area: value; margin: 0; }
  .stat .value { font-size: 22px; }
  .stat .label, .stat .sub { min-width: 0; }
  .calc-grid, .guide-links { grid-template-columns: 1fr; }
  .card { padding: 16px; }
  .rates th, .rates td { padding: 10px 8px; font-size: 14px; }
  .rates .hide-sm { display: none; }
  .badge { display: none; }
}

/* 문의하기 */
.contact-card { margin: 8px 0 24px; }
.contact-mail { font-size: 22px; font-weight: 700; margin: 4px 0 8px; word-break: break-all; }
.contact-mail a { text-decoration: none; }

/* 가이드 */
.guide-list { display: grid; gap: 12px; margin-top: 8px; }
.guide-item { display: block; text-decoration: none; color: var(--text); }
.guide-item:hover { border-color: var(--brand); }
.guide-item .tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--accent); background: rgba(38, 161, 123, 0.1); border-radius: 6px; padding: 2px 8px; }
.guide-item h2 { font-size: 18px; margin: 8px 0 6px; }
.guide-item p { margin: 0; color: var(--text-2); font-size: 15px; }
.guide-item .meta { font-size: 13px; color: var(--text-2); margin-top: 10px; }
.post-meta { font-size: 14px; color: var(--text-2); margin: 0 0 24px; }
.breadcrumb { font-size: 14px; color: var(--text-2); margin-bottom: 8px; }
.breadcrumb a { color: var(--text-2); }
.data-table { font-variant-numeric: tabular-nums; }
.data-table td:not(:first-child), .data-table th:not(:first-child) { text-align: right; }
.related { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border); }
.contact-form { margin: 8px 0 28px; }
.contact-form .hidden-field { display: none; }
.field textarea {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
  width: 100%;
  resize: vertical;
}
.field textarea:focus { outline: 2px solid var(--brand); outline-offset: -1px; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #0b0e11; font-weight: 600; padding: 10px 18px; }
.btn-primary:hover { filter: brightness(0.95); border-color: var(--brand); }
@media (max-width: 720px) {
  .contact-form .row-2 { grid-template-columns: 1fr; gap: 0; }
}

/* 메인 설명: 프레젠테이션처럼 짧은 제목 + 큰 글씨 + 카드 */
.explain { margin-top: 56px; }
.section-kicker { font-size: 14px; font-weight: 700; color: var(--brand); margin: 0 0 8px; }
.section-title { font-size: 28px; font-weight: 800; line-height: 1.35; letter-spacing: -0.03em; margin: 0 0 12px; }
.section-desc { font-size: 17px; color: var(--text-2); margin: 0 0 24px; max-width: 640px; }
.tile-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.tile { border-radius: 18px; padding: 22px; border: 1px solid var(--border); }
.tile p { margin: 0; font-size: 15px; color: #c7cdd6; line-height: 1.6; }
.tile-big { font-size: 44px; font-weight: 800; line-height: 1; margin-bottom: 14px; }
.tile-title { font-size: 19px; font-weight: 700; margin-bottom: 8px; color: #fff; }
.tile-up { background: rgba(246, 70, 93, 0.1); border-color: rgba(246, 70, 93, 0.3); }
.tile-up .tile-big { color: var(--up); }
.tile-down { background: rgba(58, 123, 253, 0.1); border-color: rgba(58, 123, 253, 0.3); }
.tile-down .tile-big { color: var(--down); }
.tile-green { background: rgba(46, 189, 133, 0.1); border-color: rgba(46, 189, 133, 0.3); }
.tile-green .tile-big { color: var(--brand); }

.steps { display: grid; gap: 10px; }
.step { display: flex; gap: 18px; align-items: flex-start; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 20px 22px; }
.step-num { font-size: 28px; font-weight: 800; color: var(--brand); line-height: 1.1; min-width: 44px; font-variant-numeric: tabular-nums; }
.step-title { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.step p { margin: 0; font-size: 15px; color: var(--text-2); }

.tip-card {
  margin-top: 16px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  border-radius: 18px;
  padding: 24px;
  background: rgba(46, 189, 133, 0.08);
  border: 1px solid rgba(46, 189, 133, 0.35);
}
.tip-icon {
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--brand);
  color: #0b0e11;
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tip-label { font-size: 14px; font-weight: 700; color: var(--brand); }
.tip-card .tip-main { font-size: 21px; font-weight: 800; line-height: 1.4; color: #fff; margin: 4px 0 8px; letter-spacing: -0.02em; }
.tip-card .tip-body { font-size: 15px; color: #c7cdd6; margin: 0; }
.tip-body strong { color: var(--brand); }

.fine-print { font-size: 13px; color: var(--text-2); margin: 16px 0 0; }

.faq-cards { display: grid; gap: 8px; }
.faq-cards details { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; }
.faq-cards summary { font-size: 16px; font-weight: 700; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq-cards summary::-webkit-details-marker { display: none; }
.faq-cards summary::after { content: "+"; color: var(--brand); font-size: 20px; line-height: 1; }
.faq-cards details[open] summary::after { content: "−"; }
.faq-cards details p { margin: 10px 0 0; color: #c7cdd6; font-size: 15px; }
.more-link { margin: 12px 0 0; font-size: 14px; }

@media (max-width: 720px) {
  .section-title { font-size: 23px; }
  .section-desc { font-size: 15px; }
  .tile-grid { grid-template-columns: 1fr; }
  .tile { padding: 18px; }
  .tile-big { font-size: 34px; margin-bottom: 8px; }
  .step { padding: 16px 18px; gap: 14px; }
  .step-num { font-size: 22px; min-width: 32px; }
  .tip-card { padding: 20px 18px; gap: 12px; }
  .tip-card .tip-main { font-size: 18px; }
  .tip-icon { width: 30px; height: 30px; font-size: 17px; }
}