:root {
  --ink: #0f2a3e;
  --paper: #c4dce8;
  --edge: #2b4d66;
  --bezel: #90a9b8;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 10%, #b8d2e0 0%, #8bacbf 100%);
  color: var(--ink);
  font-family: "Chicago", "Geneva", "Courier New", monospace;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  position: fixed;
  inset: 0;
}

#app-shell {
  position: relative;
  width: min(96vw, 1400px);
  height: min(96vh, 820px);
  border: 6px solid var(--edge);
  border-radius: 10px;
  overflow: hidden;
  background: var(--paper);
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.38),
    inset 0 0 0 12px rgba(107, 138, 157, 0.28),
    0 18px 38px rgba(8, 29, 44, 0.35);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

#hud {
  position: absolute;
  top: clamp(12px, 7%, 58px);
  left: clamp(12px, 3.7%, 52px);
  z-index: 10;
  display: flex;
  gap: clamp(4px, 0.6vw, 8px);
  font-size: clamp(11px, 1.4vw, 16px);
}

#hud span {
  padding: clamp(3px, 0.5vw, 5px) clamp(5px, 0.7vw, 9px);
  border: 2px solid var(--edge);
  border-radius: 4px;
  background: rgba(206, 228, 240, 0.9);
  font-weight: 700;
  letter-spacing: 0.02em;
}

#pause-btn {
  position: absolute;
  top: clamp(12px, 7%, 58px);
  right: clamp(12px, 3.7%, 52px);
  z-index: 10;
  display: none;
  width: clamp(36px, 5vw, 48px);
  height: clamp(36px, 5vw, 48px);
  padding: 0;
  font-size: clamp(16px, 2.2vw, 24px);
  line-height: 1;
  border-radius: 6px;
  align-items: center;
  justify-content: center;
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  gap: 12px;
  padding: 24px;
  background: rgba(130, 164, 183, 0.14);
}

.overlay.visible {
  display: flex;
}

h1 {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: clamp(20px, 4vw, 32px);
}

button {
  border: 2px solid var(--edge);
  background: #d4e9f4;
  color: var(--ink);
  border-radius: 6px;
  font-family: inherit;
  font-weight: 700;
  padding: clamp(8px, 1.2vw, 10px) clamp(16px, 2.4vw, 20px);
  min-height: 44px;
  min-width: 44px;
  cursor: pointer;
}

#status {
  pointer-events: none;
}

#status.visible {
  pointer-events: auto;
}

.result-window {
  width: min(92%, 980px);
  min-height: clamp(180px, 42vh, 340px);
  border: clamp(3px, 0.5vw, 6px) solid #0f2a3e;
  background: #c4dce8;
  box-shadow: 0 14px 28px rgba(7, 26, 38, 0.34);
  display: flex;
  flex-direction: column;
}

.result-titlebar {
  height: clamp(36px, 8vh, 68px);
  border-bottom: clamp(3px, 0.5vw, 6px) solid #0f2a3e;
  padding: clamp(6px, 1vw, 10px) clamp(10px, 1.4vw, 18px);
}

.result-lines {
  height: 100%;
  border: 4px solid #16364d;
  border-left: 0;
  border-right: 0;
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(20, 54, 76, 0.95) 0,
      rgba(20, 54, 76, 0.95) 3px,
      transparent 3px,
      transparent 9px
    );
}

.result-body {
  flex: 1;
  display: grid;
  place-items: center;
  gap: clamp(8px, 1.6vw, 16px);
  padding: clamp(12px, 2.4vw, 24px);
  color: #122f44;
}

.result-main {
  font-size: clamp(28px, 6vw, 72px);
  letter-spacing: 0.14em;
  font-weight: 700;
}

.result-sub {
  font-size: clamp(13px, 2vw, 24px);
  letter-spacing: 0.08em;
}

/* Rotate-to-landscape prompt */
#rotate-prompt {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: radial-gradient(circle at 50% 10%, #b8d2e0 0%, #8bacbf 100%);
  color: var(--ink);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  padding: 24px;
}

#rotate-prompt .rotate-icon {
  animation: rock 1.6s ease-in-out infinite;
}

@keyframes rock {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(90deg); }
  50% { transform: rotate(90deg); }
  75% { transform: rotate(0deg); }
}

@media (orientation: portrait) and (max-width: 820px) {
  #rotate-prompt {
    display: flex;
  }
  #app-shell {
    display: none;
  }
}