:root {
  --ink: #1c2421;
  --ink-soft: #5a6a62;
  --paper: #f3f6f4;
  --moss: #5f7a6a;
  --moss-deep: #3e5649;
  --shadow: 0 16px 40px rgba(28, 36, 33, 0.12);
  --font-display: "Literata", Georgia, serif;
  --font-body: "Manrope", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font-body);
  background: #b7c4bd;
}

body {
  min-height: 100dvh;
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(800px 480px at 20% 10%, rgba(255, 255, 255, 0.4), transparent 55%),
    linear-gradient(165deg, #d2dbd5, #b7c4bd 55%, #9fafa5);
}

.app {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 24px 18px 32px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
}

.brand-mark {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.brand-sub,
.card-kicker {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.progress {
  min-width: 120px;
  text-align: right;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.bar {
  margin-top: 8px;
  height: 3px;
  border-radius: 999px;
  background: rgba(28, 36, 33, 0.12);
  overflow: hidden;
}

.bar i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--moss);
  transition: width 0.4s ease;
}

.stage {
  flex: 1;
  display: grid;
  place-items: center;
}

.surface {
  position: relative;
  width: min(100%, 820px);
  aspect-ratio: 16 / 10;
  border-radius: 24px;
  background: var(--surface, #e8eee9);
  box-shadow: var(--shadow);
  overflow: hidden;
  touch-action: none;
}

.home {
  position: absolute;
  border: 1.5px dashed rgba(28, 36, 33, 0.2);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.22);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.home.hot {
  border-color: rgba(95, 122, 106, 0.7);
  background: rgba(95, 122, 106, 0.14);
}

.home.filled {
  border-color: transparent;
  background: transparent;
}

.item {
  position: absolute;
  display: grid;
  place-items: center;
  border: none;
  padding: 0;
  border-radius: 14px;
  color: inherit;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  box-shadow: 0 8px 20px rgba(28, 36, 33, 0.1);
  z-index: 2;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1;
  touch-action: none;
}

.item.dragging {
  cursor: grabbing;
  z-index: 5;
  box-shadow: 0 14px 32px rgba(28, 36, 33, 0.18);
  transform: scale(1.04);
}

.item.placed {
  cursor: default;
  box-shadow: 0 4px 12px rgba(28, 36, 33, 0.08);
}

.hint {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.92rem;
  min-height: 1.35em;
}

.overlay,
.start {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(28, 36, 33, 0.25);
  backdrop-filter: blur(6px);
}

.start[hidden],
.overlay[hidden] {
  display: none !important;
}

.start-inner,
.card {
  width: min(100%, 400px);
  padding: 32px 28px;
  border-radius: 22px;
  background: rgba(243, 246, 244, 0.95);
  box-shadow: var(--shadow);
}

.start h1,
.card h2 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  font-size: clamp(1.5rem, 4vw, 1.9rem);
}

.start-text,
.card-text {
  margin: 0 0 22px;
  color: var(--ink-soft);
  line-height: 1.5;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  font: 600 0.92rem var(--font-body);
  cursor: pointer;
}

.btn:hover {
  background: var(--moss-deep);
}

@media (max-width: 700px) {
  .top {
    flex-direction: column;
    align-items: flex-start;
  }

  .progress {
    width: 100%;
    text-align: left;
  }

  .surface {
    aspect-ratio: 4 / 5;
  }

  .item {
    font-size: 1.7rem;
  }
}