/* NineSphere landing
   색 역할: red = 유일한 인터랙션 액센트(버튼, 포커스) / bronze = 제품 재질과 기록·포인트 값
   반경 규칙: surface 16, control 10, 기기 프레임만 30/44
   z-index: nav 10, skip link 20
   애니메이션: transform, opacity만 사용 */

:root {
  color-scheme: dark;
  --bg: #0F0F13;
  --raise: #16161C;
  --line: rgba(237, 237, 240, .09);
  --line-strong: rgba(237, 237, 240, .17);
  --text: #EDEDF0;
  --muted: #A3A3AE;
  --bronze: #BCA47D;
  --red: #E8574E;
  --btn-a: #E24A42;
  --btn-b: #A81F1F;
  --btn-text: #FFF7F5;
  --frame: #09090C;
  --frame-edge: rgba(255, 253, 248, .08);
  --spot: rgba(188, 164, 125, .09);
  --disc-shadow: rgba(4, 4, 6, .62);
  --device-shadow: 0 40px 80px -40px rgba(4, 4, 6, .85);
  --nav-bg: rgba(15, 15, 19, .74);
  --chip: #18181E;
  --chip-top: rgba(188, 164, 125, .12);
  --chip-top-line: rgba(188, 164, 125, .55);
  --r-surface: 16px;
  --r-control: 10px;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --f-kr: "Noto Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --f-num: "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
  --f-latin: "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #EEF0F3;
    --raise: #F8F9FA;
    --line: rgba(22, 22, 27, .10);
    --line-strong: rgba(22, 22, 27, .19);
    --text: #16161B;
    --muted: #565661;
    --bronze: #6E5738;
    --red: #C62828;
    --frame: #121216;
    --frame-edge: rgba(255, 253, 248, .07);
    --spot: rgba(250, 250, 252, .9);
    --disc-shadow: rgba(28, 28, 40, .34);
    --device-shadow: 0 40px 80px -40px rgba(30, 30, 45, .5);
    --nav-bg: rgba(238, 240, 243, .8);
    --chip: #F8F9FA;
    --chip-top: rgba(110, 87, 56, .10);
    --chip-top-line: rgba(110, 87, 56, .5);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #EEF0F3;
  --raise: #F8F9FA;
  --line: rgba(22, 22, 27, .10);
  --line-strong: rgba(22, 22, 27, .19);
  --text: #16161B;
  --muted: #565661;
  --bronze: #6E5738;
  --red: #C62828;
  --frame: #121216;
  --frame-edge: rgba(255, 253, 248, .07);
  --spot: rgba(250, 250, 252, .9);
  --disc-shadow: rgba(28, 28, 40, .34);
  --device-shadow: 0 40px 80px -40px rgba(30, 30, 45, .5);
  --nav-bg: rgba(238, 240, 243, .8);
  --chip: #F8F9FA;
  --chip-top: rgba(110, 87, 56, .10);
  --chip-top-line: rgba(110, 87, 56, .5);
}

:root[data-theme="dark"] { color-scheme: dark; }

/* 기본 */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.7 var(--f-kr);
  letter-spacing: -.005em;
  word-break: keep-all;
  overflow-wrap: break-word;
  overflow-x: clip;
}
img { max-width: 100%; height: auto; }
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -.03em; text-wrap: balance; }
p { margin: 0; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: 1200px; margin-inline: auto; padding-inline: clamp(16px, 4vw, 40px); }

.skip {
  position: absolute; left: 12px; top: -64px; z-index: 20;
  padding: 10px 14px; border-radius: var(--r-control);
  background: var(--text); color: var(--bg); text-decoration: none; font-size: 14px;
}
.skip:focus { top: 12px; }

/* 내비게이션 */
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .nav { background: var(--bg); }
}
.nav-in { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none;
  font: 700 15px/1 var(--f-latin); letter-spacing: .2em;
}
.brand svg { width: 30px; height: 30px; flex: none; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; transition: opacity .2s; }
.nav-links a:hover { opacity: .72; }
@media (max-width: 639px) {
  .nav-links { display: none; }
  .nav-in .btn { margin-left: auto; }
}

/* 버튼 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 52px; padding-inline: 24px;
  border: 1px solid transparent; border-radius: var(--r-control);
  font: 700 16px/1 var(--f-kr); letter-spacing: -.01em;
  text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: transform .22s var(--ease-out), opacity .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(1px) scale(.98); }
.btn-primary {
  color: var(--btn-text);
  background: linear-gradient(180deg, var(--btn-a), var(--btn-b));
  box-shadow: inset 0 1px 0 rgba(255, 236, 230, .22), 0 1px 2px rgba(10, 10, 14, .35), 0 8px 18px -14px rgba(168, 31, 31, .6);
}
.btn-ghost { color: var(--text); border-color: var(--line-strong); background: transparent; }
.btn-ghost:hover { opacity: .8; }
.btn-sm { height: 40px; padding-inline: 16px; font-size: 14px; }

/* 공통 섹션 */
.section { padding-block: clamp(88px, 11vw, 152px); scroll-margin-top: 64px; }
.head { max-width: 40em; }
.head h2 { font-size: clamp(30px, 4.2vw, 52px); line-height: 1.18; }
.head p { margin-top: 20px; max-width: 36em; font-size: clamp(16px, 1.35vw, 18px); color: var(--muted); }
.note { margin-top: 18px; font-size: 14px; color: var(--muted); }
.cap { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* 스크롤 등장: JS가 뷰포트 아래 요소에만 is-pre를 붙이므로 JS가 없으면 그대로 보인다 */
[data-reveal] {
  transition: opacity .8s var(--ease-out) var(--rd, 0s), transform .8s var(--ease-out) var(--rd, 0s);
}
[data-reveal].is-pre { opacity: 0; transform: translateY(28px); }

/* 히어로 */
.hero { background: radial-gradient(58% 70% at 74% 50%, var(--spot), transparent 70%); }
.hero .wrap {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center; gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(40px, 6vw, 88px);
}
@media (min-width: 900px) { .hero .wrap { min-height: calc(100svh - 64px); } }
.eyebrow { margin-bottom: 20px; font: 500 13px/1 var(--f-latin); letter-spacing: .24em; color: var(--bronze); }
.hero h1 { font-size: clamp(40px, 6vw, 76px); font-weight: 700; line-height: 1.12; letter-spacing: -.04em; }
.hero .lead { margin-top: 24px; max-width: 31em; font-size: clamp(17px, 1.5vw, 19px); color: var(--muted); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
@media (max-width: 899px) {
  .hero { background: radial-gradient(80% 50% at 50% 72%, var(--spot), transparent 70%); }
  .hero .wrap { grid-template-columns: 1fr; }
}

.board { position: relative; margin: 0; justify-self: center; width: min(100%, 560px); perspective: 1400px; touch-action: pan-y; }
.board-shadow {
  position: absolute; left: 10%; right: 10%; top: 18%; bottom: -5%;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--disc-shadow), transparent);
  filter: blur(22px);
  will-change: transform;
}
.board-stage { position: relative; aspect-ratio: 1; will-change: transform; }
.disc { display: block; width: 100%; height: 100%; overflow: visible; }
.disc .holes circle { fill: #08080B; stroke: rgba(255, 253, 248, .07); stroke-width: .8; }
.disc .targets circle { fill: #050507; stroke: rgba(255, 253, 248, .06); stroke-width: .8; }
.disc .tring { fill: none; stroke: #E5342A; stroke-width: 1.4; transition: opacity .35s ease; }
.disc .tring.filled { opacity: 0; }
.disc .bs { fill: url(#gBallShadow); }
.disc .bb { fill: url(#gBall); }
.disc .bh { fill: #FFF8EA; opacity: .7; }
/* 인트로 시작 상태(첫 페인트 전에 인라인 스크립트가 html.intro를 붙인다) */
.intro .disc .ball { transform: translate(var(--sx), var(--sy)); }
.intro .disc .tring.filled { opacity: 1; }
.readout { position: absolute; left: 0; bottom: 0; display: flex; align-items: baseline; gap: 8px; margin: 0; font-size: 13px; color: var(--muted); }
.readout b { font: 700 30px/1 var(--f-num); color: var(--bronze); font-variant-numeric: tabular-nums; }
.readout span { font: 500 18px/1 var(--f-num); color: var(--muted); }

/* 게임 소개: 실물 보드와 앱 화면을 비율이 다른 두 단으로 어긋나게 */
.duo {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 5vw, 72px); align-items: start; margin-top: 64px;
}
.duo-screen { padding-top: clamp(0px, 9vw, 120px); }
.product { margin: 0; }
.product img { display: block; width: 100%; }
.specs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 32px 0 0; padding-top: 24px; border-top: 1px solid var(--line-strong); }
.specs div { display: grid; gap: 6px; }
.specs dt { order: 2; font-size: 13px; color: var(--muted); }
.specs dd { order: 1; margin: 0; font: 700 clamp(28px, 3vw, 40px)/1 var(--f-num); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.specs dd small { margin-left: .12em; font-size: .5em; font-weight: 500; color: var(--muted); }
.shot { margin: 0; }
.device-land {
  padding: 10px; border-radius: 30px; background: var(--frame);
  box-shadow: inset 0 0 0 1px var(--frame-edge), var(--device-shadow);
}
.device-land img { display: block; width: 100%; border-radius: 20px; }
.modes { display: grid; gap: 28px; margin-top: 40px; }
.mode { padding-top: 18px; border-top: 1px solid var(--line-strong); }
.mode h3 { font-size: 19px; }
.mode p { margin-top: 8px; color: var(--muted); font-size: 15.5px; }
@media (max-width: 899px) {
  .duo { grid-template-columns: 1fr; }
  .duo-screen { padding-top: 0; }
}
@media (max-width: 559px) {
  .specs { grid-template-columns: 1fr 1fr; row-gap: 24px; }
}

/* 대회 소개 */
.attempts { margin-top: 56px; }
.attempts-row {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(220px, .42fr);
  align-items: center; gap: 20px; margin-top: 14px;
}
.tries { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; list-style: none; margin: 0; padding: 0; }
.try {
  position: relative; isolation: isolate;
  display: grid; gap: 8px; padding: 18px 8px;
  border: 1px solid var(--line); border-radius: var(--r-control);
  background: var(--chip); text-align: center;
}
.try::after {
  content: ""; position: absolute; inset: -1px; z-index: -1;
  border: 1px solid var(--chip-top-line); border-radius: inherit;
  background: var(--chip-top);
  opacity: 0; transition: opacity .5s ease var(--d, 0s);
}
.try.top::after { opacity: 1; }
.try-n { font-size: 13px; color: var(--muted); }
.try-t { position: relative; display: block; font: 700 clamp(20px, 2.4vw, 30px)/1 var(--f-num); font-variant-numeric: tabular-nums; color: var(--muted); transition: opacity .5s ease; }
.try:not(.top) .try-t { opacity: .6; }
.t-base, .t-hi { display: block; transition: opacity .5s ease var(--d, 0s); }
.t-hi { position: absolute; inset: 0; color: var(--bronze); }
.try.top .t-base { opacity: 0; }
.arrow { width: 28px; height: 28px; color: var(--muted); }
.result { display: grid; gap: 8px; padding: 20px 24px; border: 1px solid var(--line-strong); border-radius: var(--r-surface); background: var(--raise); }
.result > span { font-size: 13px; color: var(--muted); }
.result strong { position: relative; display: block; font: 700 clamp(40px, 4.6vw, 60px)/1 var(--f-num); font-variant-numeric: tabular-nums; color: var(--muted); }
.result strong .t-hi { transition-delay: .8s; }
.result strong .t-base { opacity: 0; transition-delay: .8s; }
/* 등장 전 상태: 모든 칩이 같은 무게, 결과는 회색 */
.attempts.pre .try::after,
.attempts.pre .t-hi { opacity: 0; }
.attempts.pre .t-base,
.attempts.pre .try:not(.top) .try-t { opacity: 1; }
@media (max-width: 719px) {
  .attempts-row { grid-template-columns: 1fr; }
  .arrow { justify-self: center; transform: rotate(90deg); }
  .try { padding: 14px 4px; }
}

.exhibit {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center; gap: clamp(28px, 5vw, 72px); margin-top: 88px;
}
.rules { display: grid; gap: 44px; list-style: none; margin: 0; padding: 0; }
.rule h3 { font-size: 19px; }
.rule p { margin-top: 8px; color: var(--muted); font-size: 15.5px; }
.phone { margin: 0; justify-self: center; text-align: center; }
.device-phone {
  width: min(280px, 72vw); padding: 9px; border-radius: 44px; background: var(--frame);
  box-shadow: inset 0 0 0 1px var(--frame-edge), var(--device-shadow);
}
.device-phone img { display: block; width: 100%; border-radius: 36px; }
@media (max-width: 899px) {
  .exhibit { grid-template-columns: 1fr; gap: 44px; }
  .phone { order: -1; }
}

/* 보상 */
.rewards-grid {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(40px, 6vw, 96px); align-items: start; margin-top: 64px;
}
.ledger { display: grid; gap: clamp(18px, 2.2vw, 26px); list-style: none; margin: 0; padding: 0; }
.ledger li { display: grid; grid-template-columns: 5.4em auto minmax(0, 1fr); align-items: baseline; gap: 18px; }
.place { font-size: 15px; font-weight: 500; color: var(--muted); }
.pts { font: 700 var(--sz)/1 var(--f-num); font-variant-numeric: tabular-nums; letter-spacing: -.015em; white-space: nowrap; }
.pts small { margin-left: .18em; font-size: .42em; font-weight: 500; color: var(--muted); }
.prize { font-size: 15px; }
.ledger li:nth-child(1) { --sz: clamp(46px, 6vw, 76px); }
.ledger li:nth-child(1) .pts { color: var(--bronze); }
.ledger li:nth-child(2) { --sz: clamp(36px, 4.4vw, 54px); }
.ledger li:nth-child(3) { --sz: clamp(30px, 3.4vw, 42px); }
.ledger li:nth-child(4) { --sz: clamp(26px, 2.8vw, 34px); }
.ledger li:nth-child(5) { --sz: clamp(22px, 2.4vw, 28px); }
.shop { padding: clamp(24px, 3vw, 36px); border: 1px solid var(--line); border-radius: var(--r-surface); background: var(--raise); }
.shop h3 { font-size: 22px; }
.shop > p:first-of-type { margin-top: 10px; color: var(--muted); font-size: 15.5px; }
.goods { list-style: none; margin: 22px 0 0; padding: 0; }
.goods li { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding-block: 14px; }
.goods li + li { border-top: 1px solid var(--line); }
.g-pt { font: 700 20px/1 var(--f-num); font-variant-numeric: tabular-nums; color: var(--bronze); white-space: nowrap; }
@media (max-width: 899px) { .rewards-grid { grid-template-columns: 1fr; } }
@media (max-width: 479px) {
  .ledger li { grid-template-columns: 4.8em minmax(0, 1fr); row-gap: 6px; }
  .prize { grid-column: 2; }
}

/* 후원사 */
.tiers { display: grid; gap: 40px; margin-top: 56px; }
.tier { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 24px; align-items: start; }
.tier h3 { padding-top: 14px; font-size: 15px; font-weight: 500; letter-spacing: -.01em; color: var(--muted); }
.plates { display: grid; gap: 12px; }
.plates.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.plates.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.plate {
  display: grid; place-items: center; height: 112px;
  border: 1px dashed var(--line-strong); border-radius: var(--r-surface);
  background: var(--raise); color: var(--muted);
  font: 500 12px/1 var(--f-latin); letter-spacing: .28em;
}
.plates.one .plate { height: 148px; }
.plates.four .plate { height: 92px; }
@media (max-width: 719px) {
  .tier { grid-template-columns: 1fr; gap: 12px; }
  .tier h3 { padding-top: 0; }
  .plates.three, .plates.four { grid-template-columns: 1fr 1fr; }
  .plates.three .plate:last-child { grid-column: span 2; }
}

/* 앱 다운로드 */
.download { text-align: center; background: radial-gradient(50% 60% at 50% 40%, var(--spot), transparent 70%); }
.download .emblem { display: block; width: 72px; height: 72px; margin-inline: auto; }
.download h2 { margin-top: 24px; font-size: clamp(28px, 3.6vw, 44px); line-height: 1.25; }
.stores { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 32px; }
.store {
  display: inline-flex; align-items: center; gap: 12px; height: 52px; padding-inline: 20px;
  border: 1px solid var(--line-strong); border-radius: var(--r-control);
  font: 700 16px/1 var(--f-latin); color: var(--text);
}
.store small { font: 500 13px/1 var(--f-kr); color: var(--muted); }

.foot { border-top: 1px solid var(--line); }
.foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding-block: 28px; font-size: 14px; color: var(--muted); }
.foot .brand { font-size: 13px; color: var(--muted); }
.foot .brand svg { width: 24px; height: 24px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0s !important; transition-delay: 0s !important; animation-duration: 0s !important; }
  [data-reveal].is-pre { opacity: 1; transform: none; }
}