:root {
  --ink: #14161a;
  --text: #2a2d33;
  --muted: #646b75;
  --bg: #ffffff;
  --alt: #f5f6f8;
  --line: #e3e6ea;
  --accent: #2f6fde;
  --accent-soft: #e8f0fd;
  --warm: #e9a400;
  --warm-soft: #fff6dd;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #f2f4f7; --text: #d9dde3; --muted: #9aa3ad; --bg: #111317; --alt: #191c21;
    --line: #2b2f36; --accent: #6a9bf0; --accent-soft: #1b2740; --warm: #f2b72f; --warm-soft: #2e2715;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.7; word-break: keep-all;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 560px; }
.row { display: flex; align-items: center; justify-content: space-between; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.top { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
.top .row { height: 56px; }
.brand { font-weight: 800; color: var(--ink); text-decoration: none; font-size: 18px; }
.brand span { color: var(--accent); font-weight: 700; margin-left: 4px; }
.top-cta { background: var(--accent); color: #fff; text-decoration: none; padding: 8px 14px; border-radius: 8px; font-weight: 700; font-size: 14px; }

.hero { padding: 40px 0 48px; }
.hero-grid { display: grid; gap: 28px; }
@media (min-width: 880px) { .hero-grid { grid-template-columns: 1fr 1fr; align-items: center; } }
h1 { color: var(--ink); font-size: clamp(28px, 6vw, 42px); line-height: 1.25; margin: 0 0 14px; letter-spacing: -0.5px; }
.lead { font-size: 17px; margin: 0 0 20px; }
.quick { display: grid; gap: 10px; }
.quick input, form input, form select { width: 100%; font: inherit; padding: 13px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); }
button { font: inherit; font-weight: 700; font-size: 16px; padding: 14px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; cursor: pointer; }
.note { color: var(--muted); font-size: 13px; }

.chat { border: 1px solid var(--line); border-radius: 16px; padding: 18px; background: var(--bg); }
.chat p { margin: 0 0 10px; }
.chat-label { color: var(--muted); font-size: 12px; }
.bubble { margin-left: auto !important; width: fit-content; max-width: 85%; background: var(--alt); padding: 9px 14px; border-radius: 16px; }
.organic { border: 2px solid var(--accent); background: var(--accent-soft); border-radius: 8px; padding: 10px 12px; }
.organic p { margin: 0; }
.tag { font-size: 13px; font-weight: 700; color: var(--ink); }
.quiet { color: var(--muted); }
.sponsored { border: 2px solid var(--warm); background: var(--warm-soft); border-radius: 10px; padding: 10px 14px; }
.sponsored p { margin: 0; }
.sp-label { font-size: 12px; color: var(--muted); }
.sp-head { font-weight: 700; color: var(--ink); }
.sp-body { font-size: 14px; }

.trust { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--alt); }
.trust-row { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: center; padding: 14px 16px; font-size: 14px; font-weight: 600; color: var(--ink); }

.block { padding: 48px 0; }
.block.alt { background: var(--alt); }
h2 { color: var(--ink); font-size: clamp(22px, 4.5vw, 30px); line-height: 1.3; margin: 0 0 16px; letter-spacing: -0.3px; }
h3 { color: var(--ink); margin: 0 0 8px; }
.cards, .steps { list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 12px; }
@media (min-width: 720px) { .three { grid-template-columns: repeat(3, 1fr); } .four { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .four { grid-template-columns: repeat(4, 1fr); } }
.cards li, .steps li { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: var(--bg); display: grid; gap: 6px; }
.cards strong, .steps strong { color: var(--ink); }
.cards span, .steps span { font-size: 14px; color: var(--muted); }
.steps { counter-reset: s; }
.steps li::before { counter-increment: s; content: counter(s); width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; display: grid; place-items: center; font-size: 14px; }
.two { display: grid; gap: 12px; }
@media (min-width: 720px) { .two { grid-template-columns: 1fr 1fr; } }
.path { border-radius: 12px; padding: 18px; background: var(--bg); }
.organic-path { border: 2px solid var(--accent); }
.ad-path { border: 2px solid var(--warm); }
.path ul { margin: 0; padding-left: 20px; }
.center { text-align: center; }
.strong { font-weight: 800; color: var(--ink); font-size: 18px; }
.source { font-size: 13px; color: var(--muted); }

.report { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
.report th, .report td { border: 1px solid var(--line); padding: 12px; text-align: left; vertical-align: top; }
.report thead th { background: var(--ink); color: var(--bg); }
.report tbody th { white-space: nowrap; background: var(--alt); }

.flow { list-style: none; padding: 0; display: grid; gap: 8px; counter-reset: f; }
@media (min-width: 720px) { .flow { grid-template-columns: repeat(5, 1fr); } }
.flow li { counter-increment: f; border: 1px solid var(--line); border-radius: 10px; padding: 14px; font-weight: 700; color: var(--ink); text-align: center; }
.flow li::before { content: "STEP " counter(f); display: block; font-size: 12px; color: var(--accent); }

.faq details { border: 1px solid var(--line); background: var(--bg); border-radius: 10px; padding: 14px 16px; margin-bottom: 10px; }
.faq summary { font-weight: 700; color: var(--ink); cursor: pointer; }
.faq details p { margin: 10px 0 0; }

#diag-form { display: grid; gap: 14px; }
#diag-form label { display: grid; gap: 6px; font-weight: 600; color: var(--ink); font-size: 15px; }
#diag-form .agree { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; font-size: 13px; color: var(--muted); }
#diag-form .agree input { width: auto; margin-top: 3px; }
.hp { position: absolute; left: -9999px; }
.form-msg { min-height: 1.5em; font-weight: 600; color: var(--ink); }

.foot { border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
.foot p { margin: 4px 0; }

/* 광고 미리보기 · 예산 시뮬레이터 */
.quick-row { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.sponsored { display: flex; gap: 12px; align-items: stretch; }
.sp-img { flex: none; width: 76px; border-radius: 8px; display: grid; place-items: center; font-weight: 800; font-size: 13px;
  color: #fff; background: linear-gradient(135deg, #2f6fde, #8a5cf6); }
.sp-text { min-width: 0; }
.ad-badge { display: inline-block; font-size: 11px; padding: 0 6px; border-radius: 6px; background: var(--alt); border: 1px solid var(--line); }
.chat.flash { animation: flash .9s ease; }
@keyframes flash { 0% { box-shadow: 0 0 0 0 var(--accent); } 40% { box-shadow: 0 0 0 6px var(--accent-soft); } 100% { box-shadow: none; } }
.next-cta { display: inline-block; margin-top: 4px; font-weight: 800; text-decoration: none; }
.sim-box { border: 1px solid var(--line); border-radius: 14px; padding: 18px; background: var(--bg); }
.sim-box label { display: block; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.sim-box input[type=range] { width: 100%; accent-color: var(--accent); }
.sim-out { display: grid; gap: 10px; margin: 16px 0 6px; }
@media (min-width: 720px) { .sim-out { grid-template-columns: repeat(3, 1fr); } }
.sim-out div { background: var(--alt); border-radius: 10px; padding: 12px; display: grid; }
.sim-out span { font-size: 13px; color: var(--muted); }
.sim-out strong { font-size: 20px; color: var(--ink); }