/* 스프린틀리 랜딩.
   색은 앱 토큰(sprint-board-app/src/styles.ts)에서 가져오되, 어두운 배경에서 읽히도록
   잉크와 액센트를 뒤집었다. 액센트는 인디고 하나뿐이고 초록은 완료 표시에만 쓴다. */

:root {
  --bg: #08090C;
  --bg-2: #0E1014;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-2: rgba(255, 255, 255, 0.075);
  --line: rgba(255, 255, 255, 0.10);
  --line-2: rgba(255, 255, 255, 0.16);
  --ink: #F4F5F7;
  --sub: #A7ACB9;
  --weak: #767C8B;
  --accent: #8486FA;
  --accent-2: #5A5CF0;
  --accent-deep: #3F41D6;
  --accent-tint: rgba(124, 126, 246, 0.14);
  --done: #35C48D;
  --sans: "Manrope", "Noto Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --gutter: clamp(20px, 5vw, 64px);
  --max: 1180px;
  --radius: 22px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 82px; -webkit-text-size-adjust: 100%; background: var(--bg); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
:lang(ko) body { word-break: keep-all; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
.num { font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 10px; }

/* ───────── 타이포 ───────── */
.sp-wrap { width: 100%; max-width: calc(var(--max) + var(--gutter) * 2); margin: 0 auto; padding-inline: var(--gutter); }
.sp-section { padding-block: clamp(88px, 12vw, 160px); position: relative; }
.sp-display {
  margin: 0;
  font-size: clamp(42px, 6vw, 86px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.045em;
}
:lang(ko) .sp-display { line-height: 1.18; letter-spacing: -0.05em; }
:lang(en) .sp-display { font-size: clamp(40px, 5.2vw, 76px); }
.sp-display em { font-style: normal; color: var(--accent); }
.sp-h2 { margin: 0; font-size: clamp(30px, 4.2vw, 56px); font-weight: 800; line-height: 1.12; letter-spacing: -0.04em; }
:lang(ko) .sp-h2 { line-height: 1.26; }
.sp-kicker { margin: 0 0 16px; font-size: 14px; font-weight: 800; color: var(--accent); letter-spacing: 0.02em; }
.sp-lead { margin: 22px 0 0; font-size: clamp(17px, 1.5vw, 21px); color: var(--sub); max-width: 32em; }
.sp-body { margin: 20px 0 0; font-size: 17px; color: var(--sub); max-width: 32em; }

/* ───────── 등장 ───────── */
.rv { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease) var(--d, 0ms), transform 0.7s var(--ease) var(--d, 0ms); }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ───────── 내비 ───────── */
.sp-nav { position: sticky; top: 0; z-index: 50; transition: background 0.3s var(--ease), border-color 0.3s var(--ease); border-bottom: 1px solid transparent; }
.sp-nav.is-scrolled { background: rgba(8, 9, 12, 0.72); backdrop-filter: saturate(160%) blur(14px); border-bottom-color: var(--line); }
.sp-nav__in { display: flex; align-items: center; gap: 22px; height: 68px; width: 100%; max-width: calc(var(--max) + var(--gutter) * 2); margin: 0 auto; padding-inline: var(--gutter); }
.sp-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.03em; font-size: 18px; }
.sp-brand img { width: 28px; height: 28px; border-radius: 9px; }
.sp-nav__links { display: flex; gap: 22px; margin-left: 14px; font-size: 15px; color: var(--sub); }
.sp-nav__links a:hover { color: var(--ink); }
.sp-nav__end { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.sp-lang { font-size: 14px; font-weight: 700; color: var(--sub); border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; }
.sp-lang:hover { color: var(--ink); border-color: var(--line-2); }
@media (max-width: 860px) { .sp-nav__links { display: none; } }

/* ───────── 버튼 ───────── */
.sp-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 22px; border-radius: 16px;
  font-weight: 800; font-size: 16px; letter-spacing: -0.01em;
  background: var(--ink); color: #0B0C10;
  transition: transform 0.25s var(--spring), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}
.sp-btn:hover { transform: translateY(-2px); }
.sp-btn--sm { padding: 10px 16px; font-size: 14.5px; border-radius: 12px; }
.sp-btn--play { background: linear-gradient(135deg, var(--accent-2), var(--accent-deep)); color: #fff; box-shadow: 0 10px 30px -12px rgba(90, 92, 240, 0.9); }
.sp-btn--play[aria-disabled="true"] { cursor: default; }
.sp-btn--play small { display: block; font-size: 11.5px; font-weight: 700; opacity: 0.82; letter-spacing: 0.06em; text-transform: uppercase; }
.sp-btn--play span { text-align: left; line-height: 1.2; }
.sp-btn--ghost { background: transparent; color: var(--ink); border: 1px solid var(--line-2); }
.sp-btn--ghost:hover { background: var(--panel); }

/* ───────── 히어로 ───────── */
.sp-hero { position: relative; padding-bottom: clamp(60px, 8vw, 110px); overflow: hidden; }
.sp-hero::before {
  content: ""; position: absolute; inset: -30% 0 auto; height: 900px; pointer-events: none;
  background: radial-gradient(60% 50% at 50% 40%, rgba(90, 92, 240, 0.26), transparent 70%);
}
.sp-hero__grid { position: relative; display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: center; padding-top: clamp(36px, 6vw, 72px); }
@media (max-width: 980px) { .sp-hero__grid { grid-template-columns: 1fr; } }
.sp-hero__stage { position: relative; aspect-ratio: 1 / 1; min-height: 320px; }
.sp-hero__stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: pan-y; cursor: grab; }
.sp-hero__stage canvas:active { cursor: grabbing; }
/* WebGL 이 없거나 스크립트가 늦으면 이 링만 보인다 */
.sp-poster {
  position: absolute; inset: 12%; border-radius: 50%;
  background: conic-gradient(var(--accent-2) 0 58%, rgba(255, 255, 255, 0.08) 58% 100%);
  mask: radial-gradient(farthest-side, transparent calc(100% - 26px), #000 calc(100% - 25px));
  transition: opacity 0.6s var(--ease);
}
.is-live .sp-poster { opacity: 0; }
.sp-hud {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  text-align: center; pointer-events: none;
}
.sp-hud b { display: block; font-size: clamp(38px, 5vw, 60px); font-weight: 800; letter-spacing: -0.05em; line-height: 1; }
.sp-hud span { display: block; margin-top: 10px; font-size: 13.5px; color: var(--sub); }
.sp-hero__hint { margin: 0; text-align: center; font-size: 13.5px; color: var(--weak); }
.sp-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.sp-trust { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; }
.sp-trust li { font-size: 13.5px; font-weight: 700; color: var(--sub); border: 1px solid var(--line); border-radius: 999px; padding: 7px 13px; }
.sp-eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 20px; font-size: 13.5px; font-weight: 700; color: var(--sub); background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 7px 14px; }
.sp-eyebrow img { width: 18px; height: 18px; border-radius: 6px; }

/* ───────── 문제 문단 ───────── */
.sp-problem .sp-scrub { margin: 0; font-size: clamp(24px, 3.2vw, 44px); font-weight: 700; line-height: 1.4; letter-spacing: -0.035em; max-width: 20em; }
.sp-scrub .w { color: rgba(244, 245, 247, 0.16); transition: color 0.35s var(--ease); }
.sp-scrub .w.on { color: var(--ink); }
.sp-scrub .w.hl.on { color: var(--accent); }

/* ───────── 작동 방식 ───────── */
.sp-story { position: relative; height: 340vh; }
.sp-story__sticky { position: sticky; top: 0; min-height: 100svh; display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: clamp(24px, 5vw, 72px); width: 100%; max-width: calc(var(--max) + var(--gutter) * 2); margin: 0 auto; padding: 88px var(--gutter) 40px; }
@media (max-width: 900px) { .sp-story { height: auto; }
  .sp-story__sticky { grid-template-columns: 1fr; min-height: auto; position: static; padding-top: 40px; }
  .sp-steps li p { display: block; } }
.sp-story__art { position: relative; display: flex; justify-content: center; }
.sp-steps { list-style: none; margin: 28px 0 0; padding: 0; display: grid; gap: 10px; }
.sp-steps li { padding: 16px 18px; border-radius: 16px; border: 1px solid transparent; color: var(--weak); cursor: pointer; transition: background 0.35s var(--ease), border-color 0.35s var(--ease), color 0.35s var(--ease); }
.sp-steps li.on { background: var(--panel); border-color: var(--line); color: var(--sub); }
.sp-steps small { display: block; font-size: 12.5px; font-weight: 800; color: var(--accent); opacity: 0; transition: opacity 0.35s var(--ease); }
.sp-steps li.on small { opacity: 1; }
.sp-steps strong { display: block; font-size: 19px; font-weight: 800; letter-spacing: -0.03em; color: var(--sub); }
.sp-steps li.on strong { color: var(--ink); }
.sp-steps p { margin: 4px 0 0; font-size: 15px; line-height: 1.6; display: none; }
.sp-steps li.on p { display: block; }

/* ───────── 기기 창 ───────── */
.sp-frame { position: relative; width: min(300px, 74vw); padding: 9px; border-radius: 34px; background: linear-gradient(160deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.04)); box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.9), 0 2px 0 rgba(255, 255, 255, 0.06) inset; }
.sp-frame img { border-radius: 26px; background: #F3F4F6; }
.sp-frame--stack { aspect-ratio: 640 / 1218; }
.sp-frame--stack img { position: absolute; inset: 9px; width: calc(100% - 18px); height: calc(100% - 18px); object-fit: cover; object-position: top; opacity: 0; transform: scale(0.985); transition: opacity 0.5s var(--ease), transform 0.5s var(--ease); }
.sp-frame--stack img.on { opacity: 1; transform: none; }

/* ───────── 화면 둘러보기 ───────── */
.sp-tour { display: grid; grid-template-columns: 1fr auto; gap: clamp(28px, 6vw, 96px); align-items: center; margin-top: 52px; }
.sp-tour__tabs { display: grid; gap: 8px; }
.sp-tour__tabs button { text-align: left; cursor: pointer; padding: 18px 20px; border-radius: 18px; border: 1px solid transparent; transition: background 0.3s var(--ease), border-color 0.3s var(--ease); }
.sp-tour__tabs button:hover { background: rgba(255, 255, 255, 0.025); }
.sp-tour__tabs button[aria-selected="true"] { background: var(--panel); border-color: var(--line); }
.sp-tour__tabs strong { display: block; font-size: 19px; font-weight: 800; letter-spacing: -0.03em; color: var(--weak); transition: color 0.3s var(--ease); }
.sp-tour__tabs span { display: block; margin-top: 4px; font-size: 15px; line-height: 1.6; color: var(--weak); }
.sp-tour__tabs [aria-selected="true"] strong { color: var(--ink); }
.sp-tour__tabs [aria-selected="true"] span { color: var(--sub); }
@media (max-width: 900px) {
  .sp-tour { grid-template-columns: 1fr; }
  .sp-tour__device { order: -1; display: flex; justify-content: center; }
  .sp-tour__tabs span { display: none; }
  .sp-tour__tabs [aria-selected="true"] span { display: block; }
}

/* ───────── 기능 벤토 ───────── */
.sp-bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; margin-top: 52px; }
.sp-box { grid-column: span 2; padding: 26px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.sp-box--wide { grid-column: span 3; }
@media (max-width: 900px) { .sp-bento { grid-template-columns: 1fr; } .sp-box, .sp-box--wide { grid-column: auto; } }
.sp-box h3 { margin: 0 0 8px; font-size: 19px; font-weight: 800; letter-spacing: -0.03em; }
.sp-box p { margin: 0; font-size: 15.5px; color: var(--sub); line-height: 1.6; }
.sp-box__vis img { max-height: 240px; object-fit: cover; object-position: top; }
.sp-box__vis { margin-top: 20px; border-radius: 16px; background: rgba(0, 0, 0, 0.28); border: 1px solid var(--line); padding: 16px; }
.sp-mini { display: grid; gap: 10px; }
.sp-mini > div { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--sub); }
.sp-mini i { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--line-2); flex: none; }
.sp-mini .done i { border-color: var(--done); background: var(--done); }
.sp-mini .done b { color: var(--weak); text-decoration: line-through; font-weight: 600; }
.sp-mini .doing i { border-color: var(--accent); background: linear-gradient(90deg, var(--accent) 50%, transparent 50%); }
.sp-mini b { font-weight: 700; color: var(--ink); }
.sp-bar { height: 8px; border-radius: 999px; background: rgba(255, 255, 255, 0.1); overflow: hidden; }
.sp-bar i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--accent-2), var(--accent)); }
.sp-meta { display: flex; justify-content: space-between; font-size: 13px; color: var(--weak); margin-top: 10px; }
.sp-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.sp-chips span { font-size: 13px; font-weight: 700; color: var(--sub); border: 1px solid var(--line); border-radius: 999px; padding: 6px 11px; }
.sp-chips span.on { color: #fff; background: var(--accent-2); border-color: transparent; }

/* ───────── 개인정보 ───────── */
.sp-privacy .sp-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 44px; }
.sp-card { padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); display: flex; flex-direction: column; gap: 8px; }
.sp-card h3 { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: -0.03em; }
.sp-card p { margin: 0; font-size: 15px; color: var(--sub); flex: 1; }
.sp-card a { margin-top: 12px; font-weight: 800; font-size: 15px; color: var(--accent); }
.sp-card a:hover { text-decoration: underline; }
.sp-zeros { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; margin-top: 44px; }
.sp-zero { padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); }
.sp-zero b { display: block; font-size: 42px; font-weight: 800; letter-spacing: -0.05em; line-height: 1; color: var(--accent); }
.sp-zero span { display: block; margin-top: 10px; font-weight: 800; }
.sp-zero small { display: block; margin-top: 4px; font-size: 13.5px; color: var(--weak); }

/* ───────── FAQ ───────── */
.sp-faq__grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(24px, 4vw, 64px); }
@media (max-width: 900px) { .sp-faq__grid { grid-template-columns: 1fr; } }
.sp-faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.sp-faq summary { cursor: pointer; font-weight: 700; font-size: 17px; letter-spacing: -0.02em; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.sp-faq summary::-webkit-details-marker { display: none; }
.sp-faq summary::after { content: "+"; color: var(--accent); font-weight: 800; }
.sp-faq details[open] summary::after { content: "−"; }
.sp-faq p { margin: 12px 0 0; color: var(--sub); font-size: 15.5px; }

/* ───────── 마무리 ───────── */
.sp-final { text-align: center; position: relative; overflow: hidden; }
.sp-final::before { content: ""; position: absolute; inset: auto 0 -40% 0; height: 640px; background: radial-gradient(50% 50% at 50% 60%, rgba(90, 92, 240, 0.22), transparent 70%); pointer-events: none; }
.sp-final img { width: 86px; height: 86px; border-radius: 24px; margin: 0 auto 26px; }
.sp-final .sp-cta { justify-content: center; }
.sp-final .sp-lead { margin-inline: auto; }

/* ───────── 바닥글 ───────── */
.sp-foot { border-top: 1px solid var(--line); padding-block: 52px 64px; font-size: 14px; color: var(--weak); }
.sp-foot__top { display: flex; flex-wrap: wrap; gap: 20px; justify-content: space-between; align-items: center; }
.sp-foot nav { display: flex; flex-wrap: wrap; gap: 18px; }
.sp-foot nav a:hover { color: var(--ink); }
.sp-foot dl { display: flex; flex-wrap: wrap; gap: 8px 26px; margin: 34px 0 0; padding-top: 26px; border-top: 1px solid var(--line); }
.sp-foot dl > div { display: flex; gap: 8px; }
.sp-foot dt { color: var(--weak); }
.sp-foot dd { margin: 0; color: var(--sub); }
.sp-foot .copy { margin: 20px 0 0; font-size: 13px; }

/* ───────── 방침 문서 ───────── */
.sp-doc { max-width: 760px; }
.sp-doc h1 { font-size: clamp(30px, 4vw, 44px); font-weight: 800; letter-spacing: -0.04em; margin: 0 0 8px; }
.sp-doc .updated { color: var(--weak); font-size: 14px; margin: 0 0 36px; }
.sp-doc h2 { font-size: 20px; font-weight: 800; letter-spacing: -0.03em; margin: 40px 0 10px; }
.sp-doc p, .sp-doc li { color: var(--sub); font-size: 16px; line-height: 1.75; }
.sp-doc ul, .sp-doc ol { padding-left: 20px; }
.sp-doc li { margin: 6px 0; }
.sp-doc a { color: var(--accent); font-weight: 700; }
.sp-doc a:hover { text-decoration: underline; }
.sp-doc strong { color: var(--ink); }
.sp-doc .panel { margin: 24px 0; padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }