/* 우리AI 홍보 페이지 /about — 2026-10-12 */
:root {
  --bg: #F6F4FB; --bg2: #EFEBF9; --card: #FFFFFF; --ink: #17121F; --muted: #646876; --line: rgba(23,18,31,.10);
  --p: #6B2CF5; --p2: #22D3EE; --pick: rgba(107,44,245,.08); --shadow: 0 12px 34px rgba(31,20,70,.10);
  --chat-me: #6B2CF5; --chat-me-ink: #FFFFFF; --chat-ai: #F1EEF9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151A; --bg2: #1A1B22; --card: #1F2027; --ink: #F1F0F4; --muted: #A4A6B0; --line: rgba(255,255,255,.09);
    --p: #9B7BFF; --pick: rgba(155,123,255,.12); --shadow: 0 12px 34px rgba(0,0,0,.45);
    --chat-me: #7C5CFF; --chat-ai: #2A2B33;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
  -webkit-font-smoothing: antialiased; word-break: keep-all; line-height: 1.6; font-size: 16px; }
a { color: inherit; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 780px; }
.center { text-align: center; justify-content: center; }
.grad { background: linear-gradient(90deg, var(--p), var(--p2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* 위 막대 */
.bar { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 18px; padding: 12px 20px; padding-top: calc(12px + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.brand img { display: block; }
.brand b { font-size: 19px; letter-spacing: -.03em; }
.brand b i { font-style: normal; background: linear-gradient(90deg, var(--p), var(--p2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.bar-nav { display: flex; gap: 18px; margin-left: auto; font-size: 14.5px; font-weight: 600; color: var(--muted); }
.bar-nav a { text-decoration: none; }
.bar-nav a:hover { color: var(--ink); }
.bar-cta { padding: 9px 16px; border-radius: 999px; background: var(--ink); color: var(--bg); font-weight: 700; font-size: 14px; text-decoration: none; white-space: nowrap; }

/* 버튼 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 14px 22px; border-radius: 14px; font-weight: 800; font-size: 16px; text-decoration: none;
  color: #fff; background: linear-gradient(100deg, var(--p), #3B82F6 60%, var(--p2)); box-shadow: 0 8px 22px rgba(107,44,245,.25); }
.btn.ghost { background: var(--card); color: var(--ink); box-shadow: none; border: 1px solid var(--line); }
.btn.full { width: 100%; margin-top: auto; }

/* 첫 화면 */
.hero { padding: 56px 0 64px; background: radial-gradient(900px 500px at 85% 0%, rgba(34,211,238,.14), transparent 60%), radial-gradient(800px 500px at 0% 20%, rgba(107,44,245,.12), transparent 60%); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.eyebrow { margin: 0 0 12px; font-weight: 800; font-size: 14px; color: var(--p); letter-spacing: .02em; }
h1 { margin: 0; font-size: clamp(34px, 5.2vw, 56px); line-height: 1.18; letter-spacing: -.035em; }
.lead { margin: 20px 0 0; font-size: 18px; color: var(--muted); max-width: 36em; }
.lead b { color: var(--ink); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.proof { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 26px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: 14.5px; }
.proof li::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: #10B981; margin-right: 7px; vertical-align: 2px; }
.proof b { color: var(--ink); }

/* 대화 예시 */
.phone { background: var(--card); border-radius: 30px; box-shadow: var(--shadow); border: 1px solid var(--line); padding: 16px; max-width: 380px; justify-self: center; width: 100%; }
.phone-top { display: flex; align-items: center; gap: 8px; padding: 4px 6px 12px; border-bottom: 1px solid var(--line); }
.phone-top .dot { width: 26px; height: 26px; border-radius: 9px; background: linear-gradient(135deg, var(--p), var(--p2)); }
.phone-top small { color: var(--muted); }
.chat { display: flex; flex-direction: column; gap: 10px; padding: 14px 2px; }
.chat p { margin: 0; }
.chat .me { align-self: flex-end; max-width: 80%; padding: 9px 13px; border-radius: 16px 16px 4px 16px; background: var(--chat-me); color: var(--chat-me-ink); font-size: 14.5px; }
.chat .ai { align-self: flex-start; max-width: 92%; padding: 10px 13px; border-radius: 16px 16px 16px 4px; background: var(--chat-ai); font-size: 14.5px; display: flex; flex-direction: column; gap: 7px; }
.mini-card { background: var(--card); border-radius: 10px; padding: 7px 10px; border: 1px solid var(--line); }
.mini-card b { display: block; font-size: 13.5px; }
.mini-card small { color: var(--muted); font-size: 12.5px; }
.phone-input { display: flex; align-items: center; justify-content: space-between; padding: 11px 14px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.phone-input i { width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg, var(--p), var(--p2)); }

/* 칸 */
.sec { padding: 72px 0; }
.sec.soft { background: var(--bg2); }
.sec-h { margin: 0; text-align: center; font-size: clamp(26px, 3.4vw, 36px); letter-spacing: -.03em; line-height: 1.25; }
.sec-lead { margin: 12px auto 0; text-align: center; color: var(--muted); max-width: 40em; font-size: 16.5px; }
.sec-h.left, .sec-lead.left { text-align: left; margin-left: 0; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }

.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.who, .role, .rev article, .plan { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 24px; }
.who h3, .role h3, .plan h3, .rev h3 { margin: 8px 0 8px; font-size: 20px; letter-spacing: -.02em; }
.who p { margin: 0 0 12px; color: var(--muted); }
.tag { display: inline-block; padding: 3px 10px; border-radius: 999px; background: var(--pick); color: var(--p); font-weight: 800; font-size: 13px; }
.ticks { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.ticks li { position: relative; padding-left: 24px; font-size: 15px; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .45em; width: 12px; height: 7px; border-left: 2.5px solid var(--p); border-bottom: 2.5px solid var(--p); transform: rotate(-45deg); }

.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 30px; }
.chips span { padding: 10px 16px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); font-size: 15px; font-weight: 600; }

.fill { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; counter-reset: f; }
.fill li { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px 18px 62px; position: relative; counter-increment: f; }
.fill li::before { content: counter(f); position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; border-radius: 10px; background: linear-gradient(135deg, var(--p), var(--p2)); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.fill b { display: block; font-size: 17px; }
.fill span { color: var(--muted); font-size: 15px; }

.rev { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 32px; }
.rev p { margin: 0; color: var(--muted); font-size: 14.5px; }
.rev .won { color: var(--ink); font-size: 22px; font-weight: 800; letter-spacing: -.02em; margin: 2px 0 8px; }
.rev .won small, .price small { font-size: 13px; font-weight: 600; color: var(--muted); }
.fine { text-align: center; color: var(--muted); font-size: 13.5px; margin: 18px 0 0; }

/* 가격 */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; align-items: stretch; }
.plan { display: flex; flex-direction: column; gap: 14px; position: relative; }
.plan.pick { border: 2px solid var(--p); background: linear-gradient(180deg, var(--pick), var(--card) 40%); }
.badge { position: absolute; top: -12px; left: 22px; padding: 3px 11px; border-radius: 999px; background: var(--p); color: #fff; font-size: 12.5px; font-weight: 800; }
.plan h3 { margin: 0; }
.price { margin: 0; }
.price b { display: block; font-size: 30px; letter-spacing: -.03em; line-height: 1.2; }
.plan .ticks { margin-bottom: 6px; }

.table-wrap { margin-top: 30px; overflow-x: auto; border-radius: 18px; border: 1px solid var(--line); background: var(--card); }
.cmp { width: 100%; border-collapse: collapse; min-width: 620px; font-size: 15px; }
.cmp th, .cmp td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
.cmp thead th { font-size: 15.5px; background: var(--bg2); }
.cmp tbody th { color: var(--muted); font-weight: 600; white-space: nowrap; }
.cmp tr:last-child th, .cmp tr:last-child td { border-bottom: 0; }
.cmp td:nth-child(2), .cmp thead th:nth-child(2) { background: var(--pick); }

/* 순서 */
.steps { margin: 34px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { display: flex; gap: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.steps .n { flex: none; width: 34px; height: 34px; border-radius: 50%; background: var(--ink); color: var(--bg); font-weight: 800; display: flex; align-items: center; justify-content: center; }
.steps b { font-size: 17px; }
.steps p { margin: 4px 0 0; color: var(--muted); font-size: 14.5px; }

/* 묻고 답 */
details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; margin-top: 12px; }
details:first-of-type { margin-top: 30px; }
summary { cursor: pointer; padding: 17px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--p); font-weight: 800; font-size: 20px; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 20px 18px; color: var(--muted); }

.sec.end { padding: 80px 0; }
.foot { border-top: 1px solid var(--line); padding: 26px 0 calc(26px + env(safe-area-inset-bottom)); color: var(--muted); font-size: 13.5px; }
.foot p { margin: 4px 0; }

/* 좁은 화면 */
@media (max-width: 900px) {
  .hero-grid, .two { grid-template-columns: 1fr; }
  .three, .plans { grid-template-columns: 1fr; }
  .rev { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .bar-nav { display: none; }
  .bar-cta { margin-left: auto; }
  .plan.pick { margin-top: 8px; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .hero { padding: 36px 0 48px; }
  .lead { font-size: 16.5px; }
  .rev, .steps { grid-template-columns: 1fr; }
  .sec { padding: 54px 0; }
  .btn { width: 100%; }
  .hero-cta .btn { flex: 1 1 100%; }
}

/* 운영 세 가지 */
.how { margin: 34px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.how li { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 26px 24px; }
.how .n { width: 40px; height: 40px; border-radius: 12px; background: linear-gradient(135deg, var(--p), var(--p2)); color: #fff; font-weight: 800; font-size: 18px; display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.how b { display: block; font-size: 19px; letter-spacing: -.02em; }
.how p { margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.role-note { margin: 14px 0 0; color: var(--muted); font-size: 14.5px; }
@media (max-width: 900px) { .how { grid-template-columns: 1fr; } }