:root {
  --bg: #f2ece0;
  --ink: #3a3226;
  --ink-soft: #8c8168;
  --line: #c9bd9e;

  --wood-hi: #f1dfb2;
  --wood-mid: #d9b779;
  --wood-lo: #b78a4c;
  --wood-edge-lit: #ecd4a0;
  --wood-edge-dark: #6b4423;

  --hole-lo: #1c1108;
  --hole-mid: #402a13;
  --hole-rim: #5c3d1c;

  --marble-base: #111c27;
  --marble-dark: #08131d;
  --marble-mid: #1e3d50;
  --marble-blue: #0050a0;
  --marble-blue-light: #1684d1;
  --marble-highlight: rgba(235, 248, 255, 0.85);
  --marble-soft-highlight: rgba(170, 220, 240, 0.35);
  --marble-rim: rgba(0, 0, 0, 0.8);
  --marble-shadow: rgba(45, 25, 15, 0.35);

  --target-glow: #ff4433;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.stage {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 2.4vh 4vw 3vh;
}

/* ---- top bar ---- */

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-shrink: 0;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 0.8vh;
  color: var(--ink-soft);
  font-size: clamp(10px, 1.4vh, 12px);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.back-link:hover { color: var(--ink); }
.back-link svg { width: 13px; height: 13px; }

.title {
  margin: 0;
  font-size: clamp(16px, 2.6vh, 22px);
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.brand-divider {
  display: flex;
  align-items: center;
  gap: 0.4em;
  margin: 0.5em 0 0.35em;
}

.brand-divider span {
  display: block;
  height: 1px;
  width: 1.2em;
  background: var(--line);
}

.brand-divider span.dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line);
}

.subtitle {
  margin: 0;
  font-size: clamp(10px, 1.4vh, 12px);
  letter-spacing: 0.3em;
  color: var(--ink-soft);
}

.top-actions {
  display: flex;
  gap: 2vw;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.icon-btn:active {
  background: rgba(58, 50, 38, 0.08);
  transform: scale(0.94);
}

.tagline {
  margin: 1.6vh 0 0;
  text-align: center;
  font-size: clamp(12px, 1.7vh, 14px);
  color: var(--ink-soft);
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

/* ---- first-time hint banner ---- */

.hint-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2vw;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0 auto;
  padding: 0 4vw;
  border-radius: 999px;
  background: rgba(22, 132, 209, 0.12);
  border: 1.5px solid rgba(22, 132, 209, 0.35);
  color: var(--ink);
  font-size: clamp(11px, 1.6vh, 13px);
  letter-spacing: 0.02em;
  text-align: center;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin 0.35s ease, padding 0.35s ease;
  flex-shrink: 0;
}

.hint-banner.show {
  max-height: 8vh;
  opacity: 1;
  margin: 1.4vh auto 0;
  padding: 1vh 4vw;
}

.hint-banner-text {
  flex: 1;
}

.hint-banner-close {
  border: none;
  background: none;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0 0 0 1vw;
  flex-shrink: 0;
}

/* ---- board area ---- */

.board-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2vh;
  min-height: 0;
}

.board-wrap {
  position: relative;
  width: min(88vw, 66vh, 620px);
  aspect-ratio: 1 / 1;
}

.board-rim {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 200deg, var(--wood-edge-lit) 0deg, var(--wood-edge-dark) 180deg, var(--wood-edge-lit) 360deg);
  box-shadow: 0 2vh 3.5vh rgba(60, 40, 15, 0.3);
}

.board-circle {
  position: absolute;
  inset: 1.6%;
  border-radius: 50%;
  background:
    repeating-linear-gradient(94deg, rgba(255, 244, 220, 0.09) 0px, rgba(255, 244, 220, 0.09) 1px, transparent 1.5px, transparent 5px),
    repeating-linear-gradient(88deg, rgba(90, 60, 20, 0.07) 0px, rgba(90, 60, 20, 0.07) 1px, transparent 2px, transparent 7px),
    radial-gradient(circle at 34% 26%, var(--wood-hi) 0%, var(--wood-mid) 55%, var(--wood-lo) 100%);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.3),
    inset 0 0.4vh 1.2vh rgba(255, 255, 255, 0.35),
    inset 0 -0.7vh 1.8vh rgba(60, 35, 10, 0.38);
}

.holes-grid,
.marbles-grid {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 76%;
  height: 76%;
  transform: translate(-50%, -50%);
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(7, 1fr);
}

.marbles-grid {
  pointer-events: none;
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hole {
  width: 74%;
  height: 74%;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 36%, var(--hole-lo) 0%, var(--hole-lo) 46%, var(--hole-mid) 58%, var(--hole-rim) 66%, transparent 72%);
  box-shadow: inset 0 0.3vh 0.6vh rgba(0, 0, 0, 0.7);
  transition: box-shadow 0.2s ease;
}

.hole.valid-target {
  cursor: pointer;
  animation: target-pulse 1s ease-in-out infinite;
}

@keyframes target-pulse {
  0%, 100% {
    box-shadow:
      inset 0 0.3vh 0.6vh rgba(0, 0, 0, 0.7),
      0 0 0 0.22vh var(--target-glow),
      0 0 1.6vh 0.2vh var(--target-glow);
  }
  50% {
    box-shadow:
      inset 0 0.3vh 0.6vh rgba(0, 0, 0, 0.7),
      0 0 0 0.32vh var(--target-glow),
      0 0 2.6vh 0.4vh var(--target-glow);
  }
}

/* ---- marbles ---- */

.marble {
  position: absolute;
  width: 86%;
  height: 86%;
  border-radius: 50%;
  pointer-events: auto;
  cursor: pointer;
  overflow: hidden;
  background: radial-gradient(circle at 40% 34%, rgba(30, 61, 80, 0.82) 0%, rgba(17, 28, 39, 0.88) 55%, rgba(8, 19, 29, 0.8) 100%);
  box-shadow:
    inset 0 0 0 1.5px var(--marble-rim),
    inset -0.15vh -0.25vh 0.5vh rgba(255, 255, 255, 0.12),
    inset 0.25vh 0.45vh 0.9vh rgba(0, 0, 0, 0.4),
    inset 0 -0.5vh 0.5vh rgba(120, 180, 220, 0.25),
    0 0.35vh 0.5vh var(--marble-shadow);
  transition: transform 0.35s cubic-bezier(.4,1.4,.6,1), box-shadow 0.2s ease;
  will-change: transform;
}

.marble::before {
  content: "";
  position: absolute;
  width: 78%;
  height: 48%;
  top: 28%;
  left: 8%;
  background: linear-gradient(135deg, var(--marble-blue-light) 0%, var(--marble-blue) 50%, transparent 82%);
  border-radius: 50% 50% 60% 40% / 60% 60% 40% 40%;
  transform: rotate(calc(-22deg + var(--i, 0) * 8deg));
  opacity: 0.92;
  pointer-events: none;
}

.marble::after {
  content: "";
  position: absolute;
  width: 30%;
  height: 30%;
  top: 12%;
  left: 20%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--marble-highlight) 0%, var(--marble-soft-highlight) 45%, transparent 75%);
  pointer-events: none;
}

.marble.selected {
  transform: translateY(-14%) scale(1.08);
  box-shadow:
    inset 0 0 0 1.5px var(--marble-rim),
    inset -0.15vh -0.25vh 0.5vh rgba(255, 255, 255, 0.2),
    inset 0.25vh 0.45vh 0.9vh rgba(0, 0, 0, 0.4),
    inset 0 -0.5vh 0.5vh rgba(120, 180, 220, 0.3),
    0 1.4vh 1.2vh rgba(0, 0, 0, 0.4);
}

.marble.captured {
  animation: capture 0.3s ease forwards;
}

@keyframes capture {
  to { transform: scale(0.2); opacity: 0; }
}

.marble.shake {
  animation: shake 0.25s ease;
}

.marble.hint-bounce {
  animation: hint-bounce 1.3s ease-in-out infinite;
  animation-delay: calc(var(--i, 0) * -0.15s);
}

@keyframes hint-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12%); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6%); }
  75% { transform: translateX(6%); }
}

.marble.win-glow {
  animation: glow 1.6s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { box-shadow:
      inset 0 0 0 1.5px var(--marble-rim),
      inset -0.15vh -0.25vh 0.5vh rgba(255, 255, 255, 0.12),
      inset 0.25vh 0.45vh 0.9vh rgba(0, 0, 0, 0.55),
      0 0 1.5vh rgba(22, 132, 209, 0.5); }
  50% { box-shadow:
      inset 0 0 0 1.5px var(--marble-rim),
      inset -0.15vh -0.25vh 0.5vh rgba(255, 255, 255, 0.2),
      inset 0.25vh 0.45vh 0.9vh rgba(0, 0, 0, 0.55),
      0 0 3.5vh rgba(22, 132, 209, 0.9); }
}

/* ---- counter ---- */

.counter-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4vh;
  padding: 1vh 2vh;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.25);
}

.counter-label {
  font-size: clamp(9px, 1.3vh, 11px);
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.counter-value {
  font-size: clamp(16px, 2.4vh, 20px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.05em;
}

/* ---- how to play ---- */

.howto-link {
  align-self: center;
  flex-shrink: 0;
  border: none;
  background: none;
  color: var(--ink-soft);
  font-size: clamp(12px, 1.8vh, 14px);
  letter-spacing: 0.05em;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  padding: 1.2vh 4px 0;
}

.howto-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(30, 20, 10, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 10;
}

.howto-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

.howto-sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg);
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -1vh 3vh rgba(0, 0, 0, 0.25);
  padding: 1.6vh 6vw calc(4vh + env(safe-area-inset-bottom, 0px));
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(.4,0,.2,1);
  z-index: 11;
}

.howto-sheet.show {
  transform: translateY(0);
}

.howto-handle {
  width: 36px;
  height: 4px;
  border-radius: 2px;
  background: var(--ink-soft);
  opacity: 0.4;
  margin: 0 auto 2vh;
}

.howto-title {
  margin: 0 0 1.6vh;
  font-size: clamp(14px, 2vh, 16px);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.howto-list {
  margin: 0;
  padding: 0 0 0 1.1em;
  display: flex;
  flex-direction: column;
  gap: 1.2vh;
  font-size: clamp(13px, 1.9vh, 15px);
  color: var(--ink);
  line-height: 1.4;
}

/* ---- overlay ---- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(242, 236, 224, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.2vh;
}

.overlay-title {
  margin: 0;
  font-size: clamp(18px, 3.4vh, 26px);
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--ink);
}

.overlay-marble {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  background: radial-gradient(circle at 40% 34%, rgba(30, 61, 80, 0.82) 0%, rgba(17, 28, 39, 0.88) 55%, rgba(8, 19, 29, 0.8) 100%);
  box-shadow:
    inset 0 0 0 1.5px var(--marble-rim),
    inset -0.15vh -0.25vh 0.5vh rgba(255, 255, 255, 0.12),
    inset 0.25vh 0.45vh 0.9vh rgba(0, 0, 0, 0.4),
    inset 0 -0.5vh 0.5vh rgba(120, 180, 220, 0.25),
    0 0 3vh rgba(22, 132, 209, 0.7);
  animation: glow 1.6s ease-in-out infinite;
}

.overlay-marble::before {
  content: "";
  position: absolute;
  width: 78%;
  height: 48%;
  top: 28%;
  left: 8%;
  background: linear-gradient(135deg, var(--marble-blue-light) 0%, var(--marble-blue) 50%, transparent 82%);
  border-radius: 50% 50% 60% 40% / 60% 60% 40% 40%;
  transform: rotate(-22deg);
  opacity: 0.92;
}

.overlay-marble::after {
  content: "";
  position: absolute;
  width: 30%;
  height: 30%;
  top: 12%;
  left: 20%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--marble-highlight) 0%, var(--marble-soft-highlight) 45%, transparent 75%);
}

.overlay-sub {
  margin: 0;
  font-size: clamp(12px, 1.8vh, 14px);
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}

.overlay-actions {
  display: flex;
  gap: 3vw;
  margin-top: 1vh;
}

.again-btn,
.share-btn {
  padding: 1.2vh 4vw;
  border-radius: 999px;
  font-size: clamp(12px, 1.8vh, 14px);
  letter-spacing: 0.12em;
  cursor: pointer;
}

.again-btn {
  border: none;
  background: var(--ink);
  color: var(--bg);
}

.share-btn {
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
}

.share-note {
  margin: 0;
  font-size: clamp(11px, 1.5vh, 13px);
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.share-note.show {
  opacity: 1;
}