:root,
[data-theme="dark"] {
  --bg0: #0f1115;
  --bg1: #171a21;
  --panel: #1e2330;
  --text: #e8edf7;
  --muted: #9aa6bd;
  --accent: #5b8cff;
  --accent-hover: #7aa2ff;
  --danger: #e25555;
  --border: #2c3448;
  --input: #12151c;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --dos-bg: #000;
}

[data-theme="light"] {
  --bg0: #f4f6fb;
  --bg1: #eef2f8;
  --panel: #ffffff;
  --text: #172033;
  --muted: #5d6b86;
  --accent: #3b6ef5;
  --accent-hover: #2f5de0;
  --danger: #c62828;
  --border: #d5ddea;
  --input: #f7f9fc;
  --shadow: 0 18px 40px rgba(23, 32, 51, 0.08);
  --dos-bg: #111;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    linear-gradient(180deg, var(--bg1), var(--bg0));
}

#app {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2rem;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.brand h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: 0.01em;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-bar {
  color: var(--muted);
  font-size: 0.92rem;
}

.panel {
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
  position: relative;
  z-index: 1;
  backdrop-filter: blur(8px);
}

#authPanel { z-index: 30; }

.tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

button,
.file-btn,
.tab,
select {
  background: color-mix(in srgb, var(--panel) 70%, var(--input));
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font: inherit;
  line-height: 1.2;
  box-sizing: border-box;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.05s ease;
}

button:hover,
.file-btn:hover,
.tab:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
}

button:active { transform: translateY(1px); }

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 0.85rem;
  font-weight: 500;
}

.tab.active,
.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.danger {
  background: color-mix(in srgb, var(--danger) 18%, var(--panel));
  border-color: color-mix(in srgb, var(--danger) 45%, var(--border));
}

.ghost {
  background: transparent;
}

.form {
  display: grid;
  gap: 0.8rem;
  max-width: 380px;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

input, select {
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input);
  color: var(--text);
  font: inherit;
}

.hint { color: var(--muted); font-size: 0.85rem; margin: 0; }
.local-hint { margin: 0 0 0.85rem; }
.error { color: #ff8a8a; margin-top: 0.75rem; }
[data-theme="light"] .error { color: #b42318; }
.hidden { display: none !important; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 0.85rem;
  margin-bottom: 0.75rem;
  align-items: center;
}

.toolbar-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.toolbar-end {
  margin-left: auto;
}

.lang-btn {
  min-width: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.status {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.75rem;
}

.dos {
  width: 100%;
  min-height: 68vh;
  height: min(72vh, 720px);
  background: var(--dos-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

/* Hide OS cursor only on the game canvas — keep pointer on js-dos controls */
.dos canvas {
  cursor: none !important;
}

.dialog {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
  width: min(420px, calc(100vw - 2rem));
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.settings-form {
  padding: 1.1rem;
  max-width: none;
}

.settings-form h2,
.settings-form h3 {
  margin: 0 0 0.5rem;
}

.settings-form hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.4rem 0 0.8rem;
}

.dialog-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 0.4rem;
}

.help-page {
  max-width: 720px;
}

.help-page-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.help-page-top h2 {
  margin: 0;
  font-size: 1.35rem;
}

.help-content {
  display: grid;
  gap: 1rem;
}

.help-section h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  color: var(--text);
}

.help-section p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

@media (max-width: 720px) {
  .top { align-items: flex-start; flex-direction: column; }
  .toolbar-end { margin-left: 0; }
  .dos { min-height: 55vh; }
}