:root {
  --sf-black: #0b0b0b;
  --sf-iron: #2c2c2c;
  --sf-gold-bright: #e6cf9f;
  --sf-ivory-dim: #e5e5e5;
  --sf-text-muted: #b7b7b7;
  --sf-button-text: #f0e6d4;
  --sf-panel-bg-top: #151515;
  --sf-panel-bg-mid: #121212;
  --sf-panel-bg-bot: #181818;

  --sf-shadow: rgba(0, 0, 0, 0.65);
  --sf-ink-faint: rgba(0, 0, 0, 0.18);
  --sf-ink-muted: rgba(0, 0, 0, 0.45);
  --sf-ink-mid: rgba(0, 0, 0, 0.6);
  --sf-ink-deep: rgba(0, 0, 0, 0.9);
  --sf-white-faint: rgba(255, 255, 255, 0.018);
  --sf-gold-faint: rgba(170, 110, 55, 0.08);
  --sf-gold-soft: rgba(180, 125, 65, 0.16);
  --sf-gold-mid: rgba(190, 130, 65, 0.3);
  --sf-gold-glow: rgba(235, 185, 115, 0.18);
  --sf-frame-soft: rgba(205, 155, 85, 0.12);
  --sf-frame-strong: rgba(215, 165, 95, 0.35);
  --sf-fire-soft: rgba(195, 135, 65, 0.12);
  --sf-fire-faint: rgba(195, 135, 65, 0.04);
  --sf-flame-soft: rgba(195, 135, 65, 0.12);
  --sf-ember-faint: rgba(215, 155, 85, 0.04);

  --bevel: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(
      80% 55% at 50% -10%,
      rgba(170, 120, 70, 0.05),
      transparent 65%
    ),
    radial-gradient(
      120% 80% at 50% 110%,
      rgba(80, 50, 30, 0.08),
      transparent 70%
    ),
    linear-gradient(180deg, #1d1610 0%, #151009 50%, #0c0805 100%);
  font-family: system-ui, 'Segoe UI', sans-serif;
}

body:has(.app > #game:not([hidden])) {
  align-items: flex-start;
}

.sf-panel {
  border-radius: var(--bevel);
  box-shadow:
    inset 0 0 0 2px var(--sf-ink-deep),
    inset 0 0 0 3px var(--sf-gold-faint),
    0 0 0 1px var(--sf-gold-soft),
    0 0 18px var(--sf-frame-soft),
    0 0 50px var(--sf-fire-faint);
  padding: 24px 26px 28px;
  background:
    radial-gradient(
      120% 100% at 50% 0%,
      var(--sf-ember-faint),
      transparent 60%
    ),
    repeating-linear-gradient(
      0deg,
      var(--sf-white-faint) 0 2px,
      var(--sf-ink-faint) 2px 4px
    ),
    linear-gradient(
      var(--sf-panel-bg-top),
      var(--sf-panel-bg-mid) 40%,
      var(--sf-panel-bg-bot)
    );
  width: min(920px, 100%);
  margin: 0 auto;
  max-height: 90vh;
  overflow-y: auto;
  text-align: center;
}

.sf-panel::-webkit-scrollbar {
  width: 10px;
}
.sf-panel::-webkit-scrollbar-track {
  background: var(--sf-black);
}
.sf-panel::-webkit-scrollbar-thumb {
  background: var(--sf-iron);
  border: 1px solid var(--sf-gold-soft);
  border-radius: 6px;
}

.sf-btn {
  --btn-border: var(--sf-gold-mid);
  --btn-bg1: var(--sf-flame-soft);
  --btn-bg2: var(--sf-ink-muted);
  --btn-grad1: var(--sf-iron);
  --btn-grad2: var(--sf-black);
  --btn-color: var(--sf-button-text);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--btn-border);
  background:
    linear-gradient(180deg, var(--btn-bg1), var(--btn-bg2)),
    linear-gradient(var(--btn-grad1), var(--btn-grad2));
  color: var(--btn-color);
  box-shadow:
    inset 0 0 0 1px var(--sf-ink-mid),
    0 2px 0 0 var(--sf-shadow),
    0 8px 18px var(--sf-ink-mid),
    0 0 14px var(--sf-gold-faint);
  padding: 10px 22px;
  cursor: pointer;
  user-select: none;
  font: inherit;
  transition:
    transform 0.08s ease,
    box-shadow 0.12s ease,
    filter 0.12s ease,
    background 0.2s ease,
    color 0.12s ease;
}
.sf-btn:hover {
  filter: brightness(1.05);
  box-shadow:
    inset 0 0 0 1px var(--sf-ink-mid),
    0 2px 0 0 var(--sf-shadow),
    0 10px 22px var(--sf-ink-mid),
    0 0 18px var(--sf-frame-soft);
}
.sf-btn:active {
  transform: translateY(1px) scale(0.99);
  box-shadow:
    inset 0 0 10px var(--sf-ink-mid),
    0 2px 0 0 var(--sf-shadow),
    0 6px 14px var(--sf-ink-muted);
}
.sf-btn:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--sf-frame-strong),
    0 0 0 4px var(--sf-ink-deep);
}
.sf-btn--flame {
  --btn-bg1: rgba(210, 145, 75, 0.1);
  --btn-bg2: rgba(0, 0, 0, 0.4);
  --btn-grad1: #2a1a0c;
  --btn-grad2: #120a04;
  --btn-border: #e8c07f;
  border: 0;
  color: #f6ead6;
  text-shadow:
    0 0 8px rgba(255, 210, 145, 0.7),
    0 0 20px rgba(225, 160, 85, 0.35);
  background:
    radial-gradient(
      120% 170% at 50% 115%,
      rgba(230, 165, 90, 0.28),
      rgba(245, 200, 130, 0.08) 45%,
      transparent 70%
    ),
    linear-gradient(180deg, var(--btn-bg1), var(--btn-bg2)),
    linear-gradient(var(--btn-grad1), var(--btn-grad2));
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.7),
    inset 0 0 18px rgba(225, 165, 95, 0.18),
    inset 0 -6px 16px rgba(205, 140, 70, 0.12),
    0 2px 0 0 var(--sf-shadow),
    0 8px 18px var(--sf-ink-mid),
    0 0 22px rgba(205, 140, 70, 0.3);
}
.sf-btn--flame:hover {
  background:
    radial-gradient(
      130% 180% at 50% 115%,
      rgba(240, 175, 100, 0.34),
      rgba(250, 210, 140, 0.1) 45%,
      transparent 72%
    ),
    linear-gradient(180deg, var(--btn-bg1), var(--btn-bg2)),
    linear-gradient(var(--btn-grad1), var(--btn-grad2));
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.7),
    inset 0 0 22px rgba(235, 175, 100, 0.26),
    inset 0 -6px 18px rgba(215, 150, 80, 0.16),
    0 2px 0 0 var(--sf-shadow),
    0 10px 22px var(--sf-ink-mid),
    0 0 30px rgba(220, 155, 85, 0.4);
  text-shadow:
    0 0 12px rgba(255, 220, 160, 0.85),
    0 0 26px rgba(225, 165, 95, 0.5);
}

.sf-link {
  color: var(--sf-gold-bright);
  text-decoration: none;
  cursor: pointer;
  text-shadow: 0 0 6px var(--sf-gold-glow);
  transition:
    filter 0.12s ease,
    transform 0.12s ease;
}
.sf-link:hover {
  text-decoration: underline;
  filter: brightness(1.08);
  transform: translateY(-0.5px);
}
.sf-link:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--sf-frame-strong),
    0 0 0 4px var(--sf-ink-deep);
  border-radius: 2px;
}

.start-screen__title {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  width: 100%;
  text-align: center;
  pointer-events: none;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(180deg, #f3e3c0 0%, #d9b879 40%, #8a5a2b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 8px var(--sf-gold-glow))
    drop-shadow(0 0 24px var(--sf-fire-soft));
}

.start-screen__logo {
  display: block;
  margin: 0 auto;
  max-width: min(280px, 80vw);
  height: auto;
  filter: drop-shadow(0 0 8px var(--sf-gold-glow))
    drop-shadow(0 0 24px var(--sf-fire-soft));
}

.app:has(#game:not([hidden])) .start-screen__title {
  display: none;
}

.start-screen__description {
  margin: 14px 0;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.5;
  color: var(--sf-ivory-dim);
  text-shadow: 0 0 6px var(--sf-ink-muted);
}

.start-screen__button {
  margin: 20px auto 4px;
  min-width: 12em;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.15;
  user-select: none;
}

.start-screen__fine-print {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.45;
  color: var(--sf-text-muted);
}

.app {
  width: 100%;
}

.game {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
}

canvas {
  width: 960px;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  box-shadow:
    inset 0 0 0 2px var(--sf-ink-deep),
    0 0 18px var(--sf-frame-soft);
  outline: none;
}

#log {
  width: 960px;
  max-width: 100%;
  height: 120px;
  overflow: auto;
  margin: 0;
  padding: 8px;
  font-size: 11px;
  line-height: 1.4;
  font-family: ui-monospace, Consolas, monospace;
  background: var(--sf-black);
  border: 1px solid var(--sf-iron);
  border-radius: var(--bevel);
  white-space: pre-wrap;
  color: var(--sf-text-muted);
}
#log::-webkit-scrollbar {
  width: 10px;
}
#log::-webkit-scrollbar-track {
  background: var(--sf-black);
}
#log::-webkit-scrollbar-thumb {
  background: var(--sf-iron);
  border: 1px solid var(--sf-gold-soft);
  border-radius: 6px;
}

.sf-dialog {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: rgba(12, 8, 4, 0.78);
  backdrop-filter: blur(4px);
}

.sf-dialog__box {
  width: min(520px, 100%);
  border-radius: var(--bevel);
  padding: 28px 30px 26px;
  background:
    radial-gradient(
      120% 100% at 50% 0%,
      var(--sf-ember-faint),
      transparent 60%
    ),
    linear-gradient(
      var(--sf-panel-bg-top),
      var(--sf-panel-bg-mid) 40%,
      var(--sf-panel-bg-bot)
    );
  box-shadow:
    inset 0 0 0 2px var(--sf-ink-deep),
    inset 0 0 0 3px var(--sf-gold-faint),
    0 0 0 1px var(--sf-gold-soft),
    0 0 18px var(--sf-frame-soft),
    0 0 60px var(--sf-fire-faint);
  text-align: center;
  animation: sf-dialog-in 0.18s ease-out;
}

.sf-dialog__title {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: linear-gradient(180deg, #f3e3c0 0%, #d9b879 40%, #8a5a2b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 8px var(--sf-gold-glow))
    drop-shadow(0 0 18px var(--sf-fire-soft));
}

.sf-dialog__message {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--sf-ivory-dim);
}

.sf-dialog__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 22px;
}

.sf-dialog__button {
  min-width: 12em;
  font-size: 16px;
}

@keyframes sf-dialog-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 560px) {
  body {
    padding: 96px 14px 14px;
  }
  .start-screen__title {
    top: 14px;
  }
  .sf-panel {
    padding: 20px 16px 22px;
  }
  .start-screen__button {
    width: 100%;
    min-width: 0;
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sf-btn,
  .sf-link {
    transition: none;
  }
  .sf-dialog__box {
    animation: none;
  }
}