:root {
  color-scheme: light;
  --yellow: #ffd60a;
  --yellow-deep: #f5c400;
  --yellow-soft: #fff3bf;
  --ink: #141411;
  --ink-soft: #4a4a40;
  --bg: #faf8f0;
  --surface: #ffffff;
  --text: var(--ink);
  --muted: #6b6a5e;
  --line: #e7e3d2;
  --accent: var(--ink);
  --accent-strong: var(--ink);
  --warn-bg: var(--yellow-soft);
  --warn-line: #e8cf6a;
  --drop: #1d7a4f;
}

* {
  box-sizing: border-box;
}

html {
  font-family:
    Pretendard,
    "Pretendard Variable",
    -apple-system,
    BlinkMacSystemFont,
    "Apple SD Gothic Neo",
    "Segoe UI",
    sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
  min-height: 100vh;
}

a {
  color: var(--ink);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

::selection {
  background: var(--yellow);
  color: var(--ink);
}

/* ── topbar (index + doc 공유) ─────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 2px solid var(--ink);
  background: rgba(250, 248, 240, 0.94);
  backdrop-filter: blur(8px);
}

.topbar-inner,
.container {
  width: min(100% - 40px, 1040px);
  margin: 0 auto;
}

.topbar-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 600;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ── hero: 옐로 통판 ───────────────────────────────── */

.lp-hero {
  background: var(--yellow);
  border-bottom: 2px solid var(--ink);
  overflow: hidden;
}

.lp-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 48px;
  align-items: center;
  padding: 88px 0 96px;
}

.lp-hero-copy .eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  padding: 7px 14px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--bg);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.lp-hero h1 {
  margin: 0;
  font-size: clamp(46px, 7.2vw, 84px);
  font-weight: 900;
  letter-spacing: -0.045em;
  line-height: 1.02;
  word-break: keep-all;
}

.lp-hero h1 .underline {
  position: relative;
  white-space: nowrap;
}

.lp-hero h1 .underline::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.04em;
  height: 0.14em;
  background: var(--bg);
  z-index: -1;
  transform: scaleX(0);
  transform-origin: left;
  animation: lp-draw 0.7s 0.55s cubic-bezier(0.6, 0, 0.2, 1) forwards;
}

.lp-hero .lede {
  max-width: 520px;
  margin: 26px 0 0;
  color: var(--ink);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.7;
  word-break: keep-all;
}

.lp-hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.lp-hero .lp-alpha {
  margin: 30px 0 0;
  max-width: 520px;
  padding: 14px 16px;
  border: 2px dashed var(--ink);
  border-radius: 12px;
  background: rgba(250, 248, 240, 0.55);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.65;
  word-break: keep-all;
}

/* 로드 스태거 리빌 */
.lp-reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: lp-up 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.lp-d1 { animation-delay: 0.05s; }
.lp-d2 { animation-delay: 0.15s; }
.lp-d3 { animation-delay: 0.25s; }
.lp-d4 { animation-delay: 0.35s; }
.lp-d5 { animation-delay: 0.45s; }

@keyframes lp-up {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes lp-draw {
  to { transform: scaleX(1); }
}

/* ── hero mockup: CSS 푸시 알림 카드 ───────────────── */

.lp-mock {
  position: relative;
  min-height: 320px;
}

.lp-push {
  position: relative;
  border: 2px solid var(--ink);
  border-radius: 16px;
  background: var(--surface);
  padding: 16px 18px;
  box-shadow: 7px 7px 0 var(--ink);
  max-width: 340px;
}

.lp-push + .lp-push {
  margin-top: 18px;
  margin-left: 36px;
}

.lp-push-app {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.lp-push-app .dot {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: var(--yellow);
  border: 1.5px solid var(--ink);
}

.lp-push-title {
  margin: 10px 0 4px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.lp-push-body {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.lp-push-body strong {
  color: var(--drop);
  font-variant-numeric: tabular-nums;
}

.lp-spark {
  margin-top: 12px;
  display: block;
  width: 100%;
  height: auto;
}

.lp-spark .axis { stroke: var(--line); stroke-width: 1; }

.lp-spark .pline {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 420;
  stroke-dashoffset: 420;
  animation: lp-trace 1.6s 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.lp-spark .pdot {
  fill: var(--drop);
  stroke: var(--surface);
  stroke-width: 2;
  opacity: 0;
  animation: lp-pop 0.35s 2.1s ease-out forwards;
}

@keyframes lp-trace {
  to { stroke-dashoffset: 0; }
}

@keyframes lp-pop {
  from { opacity: 0; transform: scale(0.4); transform-origin: center; }
  to { opacity: 1; transform: scale(1); }
}

/* ── 카드 마퀴 ─────────────────────────────────────── */

.lp-marquee {
  border-bottom: 2px solid var(--ink);
  background: var(--bg);
  padding: 26px 0;
  overflow: hidden;
}

.lp-marquee-track {
  display: flex;
  gap: 16px;
  width: max-content;
  animation: lp-flow 36s linear infinite;
}

.lp-marquee:hover .lp-marquee-track {
  animation-play-state: paused;
}

@keyframes lp-flow {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.lp-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px 12px 14px;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--surface);
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.lp-card:hover {
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 var(--ink);
}

.lp-card .emoji {
  font-size: 24px;
}

.lp-card .name {
  font-size: 14px;
  font-weight: 700;
}

.lp-card .price {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.lp-card .price del {
  color: var(--muted);
  text-decoration-thickness: 1.5px;
}

.lp-card .price strong {
  color: var(--drop);
  font-weight: 800;
  margin-left: 6px;
}

.lp-marquee-caption {
  margin: 14px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* ── 3-step ───────────────────────────────────────── */

.lp-steps {
  padding: 84px 0 76px;
}

.lp-steps h2,
.lp-info h2 {
  margin: 0 0 36px;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 900;
  letter-spacing: -0.03em;
  word-break: keep-all;
}

.lp-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.lp-step {
  position: relative;
  padding: 26px 22px 24px;
  border: 2px solid var(--ink);
  border-radius: 16px;
  background: var(--surface);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.lp-step:hover {
  transform: translateY(-4px);
  box-shadow: 6px 6px 0 var(--yellow-deep);
}

.lp-step .num {
  display: inline-block;
  font-size: 44px;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--ink);
}

.lp-step h3 {
  margin: 14px 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.lp-step p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
  word-break: keep-all;
}

/* ── info 카드 ────────────────────────────────────── */

.lp-info {
  padding: 0 0 88px;
}

.lp-info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.lp-info-item {
  padding: 22px 4px 0;
  border-top: 3px solid var(--ink);
}

.lp-info-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
}

.lp-info-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.7;
  word-break: keep-all;
}

/* ── 공유 컴포넌트 (doc 페이지 호환) ───────────────── */

.hero {
  padding: 76px 0 56px;
}

.hero h1,
.doc h1 {
  margin: 0;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.hero h1 {
  max-width: 720px;
  font-size: 54px;
  font-weight: 900;
}

.doc h1 {
  font-size: 42px;
  font-weight: 900;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.lede {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--ink);
}

.button.primary {
  background: var(--ink);
  color: var(--yellow);
}

.summary {
  padding: 36px 0 72px;
  border-top: 1px solid var(--line);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.summary-item {
  padding: 20px 0;
  border-top: 3px solid var(--ink);
}

.summary-item h2 {
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: 0;
}

.summary-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.doc {
  padding: 56px 0 72px;
}

.breadcrumb {
  display: inline-flex;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 14px;
}

.meta {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.notice {
  margin: 28px 0 40px;
  padding: 16px 18px;
  border: 1px solid var(--warn-line);
  border-radius: 8px;
  background: var(--warn-bg);
  color: #5a4610;
  line-height: 1.65;
}

.section-list {
  display: grid;
  gap: 28px;
}

.section-list section {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.section-list h2 {
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: 0;
}

.section-list p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ── footer: 잉크 마감 ────────────────────────────── */

.footer {
  border-top: 2px solid var(--ink);
  padding: 34px 0 40px;
  background: var(--ink);
  color: #c9c7b8;
  font-size: 14px;
}

.footer p {
  margin: 0;
  line-height: 1.7;
}

.footer p + p {
  margin-top: 8px;
  color: #8e8c7d;
}

/* ── motion 감수성 ────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .lp-reveal,
  .lp-hero h1 .underline::after,
  .lp-spark .pline,
  .lp-spark .pdot {
    animation: none;
    opacity: 1;
    transform: none;
    stroke-dashoffset: 0;
  }

  .lp-marquee-track {
    animation: none;
    flex-wrap: wrap;
    width: auto;
  }
}

/* ── responsive ───────────────────────────────────── */

@media (max-width: 880px) {
  .lp-hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 64px 0 72px;
  }

  .lp-mock {
    min-height: 0;
  }

  .lp-push {
    max-width: 420px;
  }

  .lp-steps-grid,
  .lp-info-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .topbar-inner {
    min-height: 60px;
  }

  .nav {
    gap: 12px;
  }

  .hero {
    padding: 52px 0 40px;
  }

  .hero h1 {
    font-size: 40px;
  }

  .doc h1 {
    font-size: 34px;
  }

  .lede {
    font-size: 16px;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }
}