/* ===== 기본 — 하얀 종이 위 개미 세계관 ===== */
:root {
  --bg: #faf9f6;
  --bg2: #f2f0ea;
  --ink: #1b1916;
  --ink-dim: #6f6a61;
  --line: rgba(27, 25, 22, 0.13);
  --accent: #d9482b;          /* 빨간 개미 */
  --accent-soft: rgba(217, 72, 43, 0.08);
  --card: #ffffff;
  --radius: 18px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Pretendard Variable", Pretendard, -apple-system, "Malgun Gothic", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}
a { color: inherit; text-decoration: none; }
em { font-style: normal; color: var(--accent); }
.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }

/* 종이 질감 — 아주 옅게 */
.grain {
  position: fixed; inset: 0;
  z-index: 95; pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-3%, -6%); }
  30% { transform: translate(4%, 2%); }
  50% { transform: translate(-5%, 7%); }
  70% { transform: translate(6%, -4%); }
  90% { transform: translate(-2%, 3%); }
}
@media (prefers-reduced-motion: reduce) { .grain { animation: none; } }

/* ===== 네비 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  padding: 18px 0;
  transition: background 0.4s, backdrop-filter 0.4s, padding 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(250, 249, 246, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 12px 0;
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-weight: 800; font-size: 17px; letter-spacing: -0.01em; }
.nav-logo b { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-link { font-size: 14.5px; font-weight: 700; color: var(--ink-dim); transition: color 0.2s; }
.nav-link:hover { color: var(--accent); }
.nav-cta {
  font-size: 14px; font-weight: 700;
  padding: 9px 18px; border-radius: 99px;
  background: var(--ink); color: var(--bg);
  transition: transform 0.2s;
}
.nav-cta:hover { transform: translateY(-1px); }

/* ===== 히어로: 개미 행렬 → 루프 ===== */
.hero { height: 220vh; position: relative; }
.hero-sticky {
  position: sticky; top: 0; height: 100vh;
  overflow: hidden;
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: clamp(84px, 14vh, 150px);
  background: var(--bg);
}
.hero-loop {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 1;
}
.hero-copy {
  position: relative; z-index: 2;
  text-align: center; padding: 0 24px;
  max-width: 880px;
  will-change: transform, opacity;
}
.hero h1 {
  font-size: clamp(40px, 7.6vw, 88px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.hero-sub {
  margin-top: 26px;
  font-size: clamp(15px, 1.9vw, 19px);
  color: var(--ink-dim);
  line-height: 1.8;
}
.hero-ledger {
  margin-top: 22px;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12.5px; letter-spacing: 0.02em;
  color: var(--ink-dim);
}
.hero-ledger i { font-style: normal; color: var(--accent); margin: 0 10px; font-size: 9px; vertical-align: middle; }
.hero .btn { margin-top: 32px; }
.hero-hint {
  margin-top: 44px;
  font-size: 15px; color: var(--ink-dim);
  animation: bob 2.2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translateY(0); opacity: 0.5; } 50% { transform: translateY(6px); opacity: 1; } }

.loop-caption {
  position: absolute; left: 50%; top: 52%;
  transform: translate(-50%, 24px);
  z-index: 2;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  width: min(88vw, 620px);
}
.loop-caption-flow {
  font-size: clamp(17px, 2.6vw, 25px);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.loop-caption-flow b { color: var(--accent); }
.loop-caption-sub {
  margin-top: 14px;
  font-size: clamp(13.5px, 1.8vw, 16.5px);
  color: var(--ink-dim);
  line-height: 1.75;
}

/* ===== 버튼 ===== */
.btn {
  display: inline-block;
  padding: 16px 34px;
  border-radius: 99px;
  font-weight: 800; font-size: 16px;
  letter-spacing: -0.01em;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 10px 30px rgba(217, 72, 43, 0.25);
  will-change: transform;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 38px rgba(217, 72, 43, 0.32); }
.btn-big { padding: 20px 48px; font-size: 18px; }

/* ===== 마퀴 띠 ===== */
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 15px 0;
  background: var(--bg);
}
.marquee-track {
  display: inline-flex; align-items: center; gap: 42px;
  white-space: nowrap;
  animation: marq 36s linear infinite;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 12.5px; letter-spacing: 0.1em;
  color: var(--ink-dim);
  will-change: transform;
}
.marquee-track i { font-style: normal; color: var(--accent); font-size: 9px; }
@keyframes marq { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .marquee-track { animation: none; } }

/* ===== 섹션 공통 ===== */
.section { padding: 150px 0; position: relative; overflow: hidden; }
.section-dark { background: var(--bg2); }
.section[data-num]::before {
  content: attr(data-num);
  position: absolute;
  top: 44px; right: 3%;
  font-size: clamp(120px, 19vw, 280px);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: rgba(27, 25, 22, 0.04);
  pointer-events: none;
  user-select: none;
  font-variant-numeric: tabular-nums;
}
.eyebrow {
  display: flex; align-items: center; gap: 14px;
  font-size: 12.5px; font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.2em;
  margin-bottom: 22px;
}
.eyebrow::after {
  content: '';
  height: 1px; width: 0;
  background: rgba(217, 72, 43, 0.5);
  transition: width 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.2s;
}
.eyebrow.on::after { width: 72px; }
.section h2 {
  font-size: clamp(28px, 4.6vw, 46px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  text-wrap: balance;
}
.section-lead { font-size: 18px; color: var(--ink-dim); margin-bottom: 48px; line-height: 1.8; }
.section-close {
  margin-top: 56px;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.78;
}
.section-close strong { color: var(--accent); font-weight: 800; }

/* ===== 비교 카드 ===== */
.compare {
  display: flex; align-items: stretch; gap: 20px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.compare-card {
  flex: 1; min-width: 240px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 32px;
  background: var(--card);
  box-shadow: 0 2px 18px rgba(27, 25, 22, 0.04);
}
.compare-win { border-color: rgba(217, 72, 43, 0.4); background: #fff; box-shadow: 0 6px 28px rgba(217, 72, 43, 0.08); }
.compare-vs { align-self: center; color: var(--ink-dim); font-weight: 700; }
.compare-label { font-size: 14px; color: var(--ink-dim); margin-bottom: 14px; }
.compare-num {
  font-size: clamp(40px, 5.4vw, 58px);
  font-weight: 800; letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.compare-num span { font-size: 0.45em; font-weight: 700; color: var(--ink-dim); margin-left: 4px; }
.compare-rate { margin-top: 10px; font-size: 15px; font-weight: 700; color: var(--ink-dim); }
.compare-win .compare-rate { color: var(--accent); }
.compare-mono {
  margin-top: 18px; padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 14px; font-style: italic; color: var(--ink-dim);
  letter-spacing: -0.01em;
}

/* ===== 루프 3칸 ===== */
.loop {
  display: flex; align-items: stretch; gap: 14px;
  flex-wrap: wrap;
}
.loop-step {
  flex: 1; min-width: 200px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  background: var(--card);
  box-shadow: 0 2px 18px rgba(27, 25, 22, 0.04);
  transition: opacity 0.5s cubic-bezier(0.16,1,0.3,1), transform 0.5s cubic-bezier(0.16,1,0.3,1), border-color 0.5s;
}
.loop-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 99px;
  background: var(--ink); color: var(--bg);
  font-weight: 800; font-size: 14px;
  margin-bottom: 16px;
}
.loop-step.lit .loop-num { background: var(--accent); color: #fff; }
.loop-step h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; letter-spacing: -0.02em; }
.loop-step p { font-size: 14.5px; color: var(--ink-dim); line-height: 1.75; }
.loop-arrow { align-self: center; color: var(--ink-dim); font-size: 20px; }
.loop-step, .loop .loop-arrow { opacity: 0.3; transform: translateY(8px); }
.loop-step.lit, .loop .loop-arrow.lit { opacity: 1; transform: none; }
.loop-step.lit { border-color: rgba(217, 72, 43, 0.35); }

.loop-return {
  margin-top: 18px;
  padding: 16px 22px;
  border: 1px dashed rgba(217, 72, 43, 0.5);
  border-radius: var(--radius);
  background: var(--accent-soft);
  font-size: 15px;
  color: var(--ink-dim);
  display: flex; align-items: center; gap: 14px;
  opacity: 0.25;
  transition: opacity 0.6s, border-color 0.6s;
}
.loop-return.lit { opacity: 1; border-color: var(--accent); }
.loop-return b { color: var(--accent); }
.loop-return-arrow {
  font-size: 24px; color: var(--accent);
  animation: spin-back 3.2s linear infinite;
  display: inline-block;
}
@keyframes spin-back { from { transform: rotate(0); } to { transform: rotate(-360deg); } }
@media (prefers-reduced-motion: reduce) { .loop-return-arrow, .loop-back-arrow { animation: none; } }

/* ===== 6칸 카드 ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 48px;
}
.step-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  background: var(--card);
  box-shadow: 0 2px 18px rgba(27, 25, 22, 0.04);
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.step-card:hover {
  border-color: rgba(217, 72, 43, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(217, 72, 43, 0.09);
}
.step-no {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 13px; color: var(--accent);
  letter-spacing: 0.1em;
}
.step-card h3 { font-size: 20px; font-weight: 800; margin: 12px 0 10px; letter-spacing: -0.02em; }
.step-card p { font-size: 14.5px; color: var(--ink-dim); line-height: 1.75; }

/* 마지막 '원정 시작' 카드 = 빨간 CTA */
.step-card-go { background: var(--accent); border-color: var(--accent); }
.step-card-go .step-no { color: rgba(255,255,255,0.72); }
.step-card-go h3 { color: #fff; }
.step-card-go p { color: rgba(255,255,255,0.9); }
.step-card-go:hover { border-color: var(--accent); box-shadow: 0 12px 34px rgba(217,72,43,0.28); }

/* ===== 마지막 CTA ===== */
.section-final { padding: 170px 0; }
.loop-back {
  margin-top: 52px;
  display: inline-flex; align-items: center; gap: 10px;
  background: none; border: none;
  color: var(--ink-dim);
  font: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: color 0.25s;
}
.loop-back:hover { color: var(--accent); }
.loop-back-arrow {
  font-size: 20px; color: var(--accent);
  display: inline-block;
  animation: spin-back 3.2s linear infinite;
}

/* ===== 푸터 ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 60px;
  font-size: 14px; color: var(--ink-dim);
}
.footer-sub { margin-top: 6px; font-size: 12px; opacity: 0.7; }
.footer-sub a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }

/* ===== 페이지 루프 레일 (개미 발자국 길) ===== */
.rail {
  position: fixed; left: 28px; top: 14vh;
  height: 72vh; width: 2px; z-index: 40;
  background: transparent;
  border-left: 2px dotted rgba(27, 25, 22, 0.18);
}
.rail-fill {
  position: absolute; top: 0; left: -2px; width: 2px; height: 0;
  background: var(--accent);
}
.rail-dot {
  position: absolute; left: 0; top: 0;
  transform: translate(-50%, -50%);
  width: 10px; height: 10px; border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(217, 72, 43, 0.15);
}
.rail-node {
  position: absolute; left: 0;
  transform: translate(-50%, -50%);
  width: 7px; height: 7px; border-radius: 99px;
  border: 1.5px solid rgba(27, 25, 22, 0.3);
  background: var(--bg);
  transition: all 0.35s;
}
.rail-node.on { background: var(--accent); border-color: var(--accent); }
@media (max-width: 1100px) { .rail { display: none; } }

/* ===== 공유 링크 방문자 환영 오버레이 ===== */
.shared-ov { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 24px; }
.shared-ov-bd { position: absolute; inset: 0; background: rgba(27,25,22,0.6); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.shared-ov-box { position: relative; z-index: 1; background: var(--card); border-radius: 20px; padding: 40px 32px; max-width: 380px; width: 100%; text-align: center; box-shadow: 0 24px 60px rgba(0,0,0,0.3); }
.shared-ov-lab { font-family: ui-monospace, Consolas, monospace; font-size: 12px; letter-spacing: 0.16em; color: var(--ink-dim); }
.shared-ov-kw { font-size: clamp(32px, 8vw, 42px); font-weight: 800; letter-spacing: -0.03em; color: var(--accent); margin-top: 12px; line-height: 1.15; }
.shared-ov-t { font-size: 16px; font-weight: 700; color: var(--ink); margin-top: 10px; }
.shared-ov-q { font-size: 15px; color: var(--ink-dim); margin: 22px 0 18px; }
.shared-ov-box .btn { display: block; }
.shared-ov-close { margin-top: 14px; background: none; border: none; color: var(--ink-dim); font: inherit; font-size: 13px; cursor: pointer; }

/* ===== 스크롤 리빌 ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.on { opacity: 1; transform: translateY(0); }

.wsplit .w {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.55em) rotate(1.5deg);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--wd, 0ms);
  will-change: transform;
}
.wsplit.on .w, .wsplit.reveal.on .w { opacity: 1; transform: none; }
.wsplit.reveal { opacity: 1; transform: none; }

@media (max-width: 720px) {
  .section { padding: 90px 0; }
  .loop-arrow { display: none; }
  .compare-vs { width: 100%; text-align: center; }
  .loop-caption { width: 84vw; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .wsplit .w { opacity: 1; transform: none; transition: none; }
  .hero-hint { animation: none; }
  html { scroll-behavior: auto; }
}