:root {
  --bg: #f5f1e8;
  --panel: #fffaf2;
  --panel-border: #d8ccb7;
  --text: #243247;
  --muted: #6f7c8c;
  --accent: #15589a;
  --accent-soft: rgba(32, 104, 179, 0.18);
  --button: #173554;
  --button-hover: #0f2740;
  --shadow: rgba(34, 42, 58, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(50, 134, 214, 0.12), transparent 36%),
    linear-gradient(180deg, #fbf7ef 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.page {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 32px 16px;
}

.page-title {
  margin: 0 0 14px;
  color: #21486f;
  font-family: "Comic Sans MS", "Trebuchet MS", cursive;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-align: center;
}

.game-panel {
  width: min(100%, 980px);
  padding: 24px;
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: 0 18px 48px var(--shadow);
}

.panel-header {
  margin-bottom: 14px;
}

.panel-action-row {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 10px;
}

#gameCanvas {
  display: block;
  width: min(100%, 720px);
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border: 2px solid #1d314d;
  border-radius: 16px;
  background: linear-gradient(180deg, #f8fbfd 0%, #ecf3f8 100%);
  box-shadow: inset 0 0 0 1px rgba(20, 55, 90, 0.08);
  cursor:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 28 28'%3E%3Cg fill='none' stroke-linecap='round'%3E%3Cpath d='M14 2v24M2 14h24' stroke='%23ffffff' stroke-width='4'/%3E%3Cpath d='M14 2v24M2 14h24' stroke='%230f2740' stroke-width='2'/%3E%3Ccircle cx='14' cy='14' r='3.5' stroke='%23ffffff' stroke-width='4'/%3E%3Ccircle cx='14' cy='14' r='3.5' stroke='%230f2740' stroke-width='2'/%3E%3C/g%3E%3C/svg%3E")
      14 14,
    crosshair;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

.hud {
  margin-top: 18px;
}

.instructions {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.6;
}

.status-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-bottom: 16px;
}

.status-grid p {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid rgba(29, 49, 77, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
}

.label {
  font-weight: 700;
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button-row[hidden] {
  display: none;
}

.mode-row {
  margin-bottom: 14px;
}

.stage-info {
  margin: 16px 0 0;
  padding: 12px 14px;
  border: 1px solid rgba(29, 49, 77, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--muted);
  line-height: 1.6;
  white-space: pre-line;
}

button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 20px;
  background: var(--button);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.16s ease, transform 0.16s ease;
}

button:hover,
.button-link:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

button:active,
.button-link:active {
  transform: translateY(0);
}

button.is-active {
  background: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

button:disabled {
  background: #97a3b3;
  cursor: not-allowed;
  transform: none;
}

.secondary-button {
  background: #e2ecf8;
  color: var(--text);
}

.secondary-button:hover {
  background: #d2e2f3;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  padding: 12px 20px;
  background: var(--button);
  color: #fff;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.16s ease, transform 0.16s ease;
}

.button-link.secondary-button {
  background: #e2ecf8;
  color: var(--text);
}

.button-link.secondary-button:hover {
  background: #d2e2f3;
}

.howto-panel {
  max-width: 760px;
}

.howto-header {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 20px;
}

.howto-steps {
  display: grid;
  gap: 28px;
}

.howto-step {
  margin: 0;
}

.howto-step img {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 auto;
  border: 2px solid #1d314d;
  border-radius: 16px;
  background: #ffffff;
}

.howto-step p {
  max-width: 560px;
  min-height: 1.8em;
  margin: 10px auto 0;
  color: var(--text);
  line-height: 1.7;
  white-space: pre-line;
}

.tutorial-row {
  margin-top: 12px;
}

.stage-loader {
  margin-bottom: 14px;
  padding: 14px;
  border: 1px solid rgba(29, 49, 77, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
}

.top-stage-loader {
  margin-top: 0;
  margin-bottom: 0;
  padding: 6px 8px;
}

.top-stage-loader-row {
  flex-wrap: nowrap;
  justify-content: flex-start;
  gap: 4px;
  align-items: center;
  font-size: 0.78rem;
}

.stage-loader-row,
.maker-export-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.stage-field {
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.stage-row-label {
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  font-size: 0.78rem;
}

.stage-field input,
.stage-field select {
  width: 68px;
  min-width: 0;
  padding: 5px 6px;
  border: 1px solid rgba(29, 49, 77, 0.2);
  border-radius: 12px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-size: 0.78rem;
}

.top-stage-loader-row .stage-field {
  flex: 0 1 auto;
}

.top-stage-loader-row button {
  flex: 0 0 auto;
  width: auto;
  min-width: 0;
  padding: 8px 10px;
  font-size: 0.76rem;
  white-space: nowrap;
}

.status-text {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.status-text.is-error {
  color: #a11d33;
}

.rules-panel {
  width: min(100%, 980px);
}

.rules-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}

.rules-kicker {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rules-header h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.rules-lead {
  margin-bottom: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(227, 239, 251, 0.9), rgba(255, 255, 255, 0.95));
  border: 1px solid rgba(29, 49, 77, 0.1);
}

.rules-lead p {
  margin: 0;
  line-height: 1.8;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.rule-card {
  padding: 16px;
  border: 1px solid rgba(29, 49, 77, 0.12);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
}

.rule-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.rule-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.rule-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 12px;
  border-radius: 18px;
  background-color: #edf4fb;
  box-shadow: inset 0 0 0 1px rgba(20, 55, 90, 0.08);
}

.rule-sprite-icon {
  display: block;
  padding: 8px;
}

.sprite-loop {
  background-image: none;
  position: relative;
}

.sprite-loop::before,
.sprite-loop::after {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 16px;
}

.sprite-loop::before {
  background: rgba(32, 104, 179, 0.18);
  border: 6px solid #1d5ea6;
}

.sprite-loop::after {
  inset: 24px;
  background: #edf4fb;
  border-radius: 10px;
}

.rules-notes {
  margin-top: 18px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(29, 49, 77, 0.12);
}

.rules-notes h3 {
  margin: 0 0 10px;
}

.rules-notes ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.75;
}

.maker-panel {
  margin-top: 12px;
  padding: 16px;
  border: 1px solid rgba(29, 49, 77, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.92);
}

.maker-size-row,
.maker-palette,
.maker-action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.maker-palette,
.maker-action-row {
  margin-top: 12px;
}

.maker-export-row {
  margin-top: 12px;
}

.maker-field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text);
}

.maker-field input {
  width: 88px;
  padding: 10px 12px;
  border: 1px solid rgba(29, 49, 77, 0.2);
  border-radius: 12px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
}

.maker-tool {
  background: #e6eef7;
  color: var(--text);
}

.maker-tool:hover {
  background: #d7e5f4;
}

.maker-tool.is-active {
  background: var(--accent);
  color: #ffffff;
}

.maker-hint {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.maker-json-output {
  width: 100%;
  min-height: 180px;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(29, 49, 77, 0.2);
  border-radius: 14px;
  background: #f7fafc;
  color: var(--text);
  font: 0.92rem/1.5 "Consolas", "SFMono-Regular", monospace;
  resize: vertical;
}

@media (max-width: 560px) {
  .game-panel {
    padding: 18px;
    border-radius: 18px;
  }

  .page {
    padding: 22px 10px;
  }

  .page-title {
    font-size: 1.15rem;
    margin-bottom: 10px;
  }

  .button-row {
    flex-direction: column;
  }

  .maker-size-row,
  .maker-palette,
  .maker-action-row,
  .maker-export-row,
  .stage-loader-row {
    flex-direction: column;
  }

  .top-stage-loader-row {
    flex-direction: row;
    gap: 3px;
    font-size: 0.7rem;
  }

  .panel-action-row {
    margin-bottom: 8px;
  }

  .maker-field,
  .stage-field {
    justify-content: flex-start;
  }

  button {
    width: 100%;
  }

  .top-stage-loader-row {
    gap: 4px;
  }

  .top-stage-loader-row button {
    width: auto;
    padding: 6px 8px;
    flex: 0 0 auto;
    font-size: 0.7rem;
  }

  .maker-field input,
  .stage-field input,
  .stage-field select {
    width: 56px;
    padding: 4px 5px;
    font-size: 0.7rem;
  }

  .stage-row-label {
    font-size: 0.7rem;
  }

  .top-stage-loader {
    padding: 5px 6px;
  }

  .rules-header {
    flex-direction: column;
    align-items: stretch;
  }

  .rules-grid {
    grid-template-columns: 1fr;
  }
}