*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #111;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --muted: #555;
  --accent: #c8a84b;
  --error: #e05555;
  --radius: 5px;
  --font: 'Courier New', 'Courier', monospace;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  min-height: 100dvh;
}

/* --- Game Screen --- */

#game {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
}

#image-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #000;
  position: relative;
}

#level-img {
  max-width: 100%;
  max-height: calc(100vh - 76px);
  max-height: calc(100dvh - 76px);
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

#level-img.hidden { display: none; }

#img-placeholder {
  color: var(--muted);
  font-size: 1rem;
  text-align: center;
  padding: 2rem;
  line-height: 1.6;
}

/* --- Input Bar --- */

#input-wrap {
  flex-shrink: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

#code-form {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.url-prefix {
  color: var(--muted);
  font-size: 0.8rem;
  white-space: nowrap;
  user-select: none;
  flex-shrink: 0;
}

#code-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font);
  font-size: 1.05rem;
  padding: 0.2rem 0.25rem;
  outline: none;
  caret-color: var(--accent);
  letter-spacing: 0.05em;
}

#code-input::placeholder {
  color: #444;
}

#code-form button[type="submit"] {
  flex-shrink: 0;
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font);
  font-size: 1rem;
  padding: 0.2rem 0.65rem;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.12s;
  line-height: 1.4;
}

#code-form button[type="submit"]:hover,
#code-form button[type="submit"]:focus {
  background: rgba(200, 168, 75, 0.15);
  outline: none;
}

#error-msg {
  color: var(--error);
  font-size: 0.75rem;
  min-height: 1em;
  padding-left: 0.1rem;
}

/* --- Win Screen --- */

#win-screen,
#error-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  height: 100dvh;
  text-align: center;
  padding: 2rem;
}

.win-inner,
.error-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.win-trophy {
  font-size: 4rem;
  color: var(--accent);
  line-height: 1;
}

#win-screen h1 {
  font-size: 2rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

#win-screen p,
#error-screen p {
  color: var(--muted);
  font-size: 0.9rem;
}

#restart-btn,
.error-inner button {
  margin-top: 0.5rem;
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 0.4rem 1.2rem;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.12s;
}

#restart-btn:hover,
.error-inner button:hover {
  background: rgba(200, 168, 75, 0.15);
}

/* --- Difficulty Screen --- */

#diff-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  height: 100dvh;
  padding: 2rem 1.25rem;
  background: var(--bg);
}

#diff-inner {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

#title-logo {
  font-size: 2.6rem;
  color: var(--accent);
  letter-spacing: 0.35em;
  font-family: var(--font);
  font-weight: bold;
  text-align: center;
}

.tagline {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  font-family: var(--font);
  text-align: center;
  margin-top: -0.75rem;
}

#diff-cards {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  width: 100%;
}

.diff-card {
  display: grid;
  grid-template-columns: 2.8rem 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  cursor: pointer;
  text-align: left;
  font-family: var(--font);
  transition: border-color 0.15s, background 0.15s;
}

.diff-card:hover,
.diff-card:focus {
  border-color: var(--accent);
  background: rgba(200, 168, 75, 0.07);
  outline: none;
}

.diff-dots {
  grid-row: 1 / 3;
  color: var(--accent);
  font-size: 0.5rem;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.diff-name {
  color: var(--accent);
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  font-weight: bold;
  display: block;
}

.diff-desc {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  display: block;
}

/* Classic card — subdued retro look */
.diff-card--classic {
  border-color: #222;
  opacity: 0.75;
}
.diff-card--classic:hover,
.diff-card--classic:focus {
  border-color: #555;
  background: rgba(120, 120, 120, 0.07);
  opacity: 1;
}
.diff-card--classic .diff-name {
  color: #888;
}
.diff-card--classic:hover .diff-name,
.diff-card--classic:focus .diff-name {
  color: var(--text);
}
.diff-dots--classic {
  font-size: 0.6rem;
  color: #555;
}

/* Separator between codewort section and KOPFKINO */
.diff-separator {
  color: var(--muted);
  font-size: 0.64rem;
  letter-spacing: 0.35em;
  text-align: center;
  padding: 0.65rem 0 0.3rem;
  border-top: 1px solid var(--border);
  margin-top: 0.15rem;
  font-family: var(--font);
}

/* KOPFKINO card — teal accent, distinct from codewort cards */
.diff-card--kopfkino .diff-name {
  color: #5ab8b8;
}
.diff-card--kopfkino:hover .diff-name,
.diff-card--kopfkino:focus .diff-name {
  color: #7acece;
}
.diff-dots--kopfkino {
  color: #5ab8b8;
  font-size: 0.72rem;
}
.diff-card--kopfkino:hover,
.diff-card--kopfkino:focus {
  border-color: #5ab8b8;
  background: rgba(90, 184, 184, 0.07);
  outline: none;
}

.back-to-diff {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 0.3rem 0.9rem;
  cursor: pointer;
  border-radius: var(--radius);
  transition: border-color 0.12s, color 0.12s;
  margin-top: 0.25rem;
}

.back-to-diff:hover {
  border-color: var(--text);
  color: var(--text);
}

/* --- Utility --- */

.hidden {
  display: none !important;
}