:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f2f3f7;
  --text: #1d1d1f;
  --text-2: #5f6368;
  --text-3: #8e9196;
  --line: #e3e5ea;
  --accent: #0a74ff;
  --accent-soft: rgba(10, 116, 255, 0.1);
  --mark: rgba(255, 196, 0, 0.32);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 40px rgba(0, 0, 0, 0.08);
  --radius: 18px;
  --max: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard Variable", Pretendard, system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0e10;
    --surface: #17181b;
    --surface-2: #202125;
    --text: #f2f2f4;
    --text-2: #a8abb2;
    --text-3: #7c7f86;
    --line: #2b2d32;
    --accent: #4c9bff;
    --accent-soft: rgba(76, 155, 255, 0.16);
    --mark: rgba(255, 196, 0, 0.22);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 40px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* 머리 */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-weight: 700; font-size: 19px; color: var(--text); letter-spacing: -0.01em; }
.logo:hover { text-decoration: none; }
.logo b { color: var(--accent); }
.site-header nav { display: flex; gap: 24px; font-size: 15px; }
.site-header nav a { color: var(--text-2); }

/* 히어로 */
.hero { text-align: center; padding: 88px 0 40px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 15px; margin: 0 0 16px; }
.hero h1 {
  font-size: clamp(44px, 8vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin: 0;
  font-weight: 800;
}
.hero h1 .num { color: var(--accent); }
.hero .lede { font-size: clamp(18px, 2.2vw, 21px); color: var(--text-2); max-width: 640px; margin: 24px auto 0; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 36px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 48px; padding: 0 22px; border-radius: 999px;
  font-size: 16px; font-weight: 600; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary[aria-disabled="true"] { opacity: 0.85; cursor: default; }
.btn-ghost { color: var(--text); border-color: var(--line); }
.btn-ghost:hover { background: var(--surface-2); }
.btn svg { width: 18px; height: 18px; }

/* 실제 앱 화면 */
.shot { margin: 0; border-radius: 22px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--surface); }
.shot img { display: block; width: 100%; height: auto; }
.shot-hero { margin: 56px auto 0; max-width: 1080px; border-radius: 26px; border-width: 10px; border-color: #1d1d1f; }

.tile-shot { padding: 0 0 26px; overflow: hidden; }
.tile-shot .crop { height: 300px; overflow: hidden; border-bottom: 1px solid var(--line); background: #fff; margin-bottom: 18px; }
.tile-shot .crop img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top; }
.tile-shot .who, .tile-shot h3, .tile-shot p { margin-left: 24px; margin-right: 24px; }
.tile-shot h3 { margin-top: 6px; }

/* 본문 구역 */
section.block { padding: 96px 0 0; }
.block h2 { font-size: clamp(30px, 4.2vw, 44px); line-height: 1.2; letter-spacing: -0.025em; margin: 0 0 14px; }
.block .sub { color: var(--text-2); font-size: 19px; margin: 0 0 40px; max-width: 680px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; }
.tile h3 { font-size: 20px; margin: 10px 0 6px; letter-spacing: -0.01em; }
.tile p { margin: 0; color: var(--text-2); font-size: 16px; }
.tile .who { font-size: 14px; color: var(--accent); font-weight: 600; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { counter-increment: step; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; }
.steps li::before { content: counter(step); display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--text); color: var(--bg); font-weight: 700; font-size: 15px; }
.steps h3 { font-size: 20px; margin: 14px 0 6px; }
.steps p { margin: 0; color: var(--text-2); font-size: 16px; }

.privacy-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.privacy-panel ul { margin: 0; padding: 0; list-style: none; }
.privacy-panel li { padding: 14px 0; border-top: 1px solid var(--line); }
.privacy-panel li:first-child { border-top: 0; padding-top: 0; }
.privacy-panel li b { display: block; margin-bottom: 2px; }
.privacy-panel li span { color: var(--text-2); font-size: 16px; }

.faq details { border-top: 1px solid var(--line); padding: 18px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-3); font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--text-2); margin: 10px 0 0; }

.closing { text-align: center; padding: 120px 0 40px; }
.closing h2 { font-size: clamp(36px, 6vw, 60px); letter-spacing: -0.03em; margin: 0; }
.closing p { color: var(--text-2); font-size: 19px; margin: 14px 0 0; }

/* 문서 페이지 (개인정보처리방침·지원) */
.doc { max-width: 760px; padding-top: 64px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); letter-spacing: -0.025em; line-height: 1.2; margin: 0 0 8px; }
.doc .updated { color: var(--text-3); font-size: 15px; margin: 0 0 40px; }
.doc h2 { font-size: 22px; margin: 44px 0 10px; letter-spacing: -0.01em; }
.doc p, .doc li { color: var(--text-2); }
.doc ul { padding-left: 20px; }
.doc li { margin: 6px 0; }
.doc strong { color: var(--text); }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
.doc th, .doc td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--text); font-weight: 600; }
.doc td { color: var(--text-2); }
.doc .table-scroll { overflow-x: auto; }
.contact-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin: 8px 0 0; }
.contact-card a { font-size: 20px; font-weight: 600; }

/* 꼬리 */
.site-footer { margin-top: 96px; border-top: 1px solid var(--line); padding: 28px 0 48px; font-size: 14px; color: var(--text-3); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--text-2); }
.footer-about { max-width: 640px; }
.footer-about p { margin: 6px 0 0; line-height: 1.5; }

@media (max-width: 860px) {
  .grid-3, .steps { grid-template-columns: 1fr; }
  .grid-2, .privacy-panel { grid-template-columns: 1fr; }
  .privacy-panel { padding: 28px 24px; gap: 28px; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .hero { padding-top: 56px; }
  .shot-hero { border-width: 6px; border-radius: 18px; }
  .shot { border-radius: 14px; }
  .site-header nav { gap: 16px; }
  section.block { padding-top: 72px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* 글과 화면을 나란히 */
.split { display: grid; grid-template-columns: 1fr 440px; gap: 56px; align-items: center; }
.split .sub { margin-bottom: 16px; }
@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; gap: 24px; }
  .split .shot { max-width: 440px; }
}