/*
 * NPESL theme tokens and the floating theme switch.
 * Loaded after each page's own styles; the html[data-theme] selectors win
 * over the pages' :root rules, including their prefers-color-scheme media.
 */

html[data-theme="bright"],
html[data-theme="auto"],
html:not([data-theme]) {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --rule: #e0e0e0;
  --rail: #e5e5ea;
  --surface: #f5f5f7;
  --surface-strong: #e8e8ed;
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-tint: #e8f2ff;
  --on-blue: #ffffff;
  --icon: #515154;
}

html[data-theme="sepia"] {
  color-scheme: light;
  --bg: #f6efe0;
  --fg: #3b3327;
  --muted: #7b6d58;
  --rule: #ded1b8;
  --rail: #d6c7aa;
  --surface: #efe5d1;
  --surface-strong: #e5d8bf;
  --blue: #8a5a2b;
  --blue-hover: #a06c37;
  --blue-tint: #f0e0c8;
  --on-blue: #ffffff;
  --icon: #6d5c44;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --fg: #f5f5f7;
  --muted: #98989d;
  --rule: #38383a;
  --rail: #2c2c2e;
  --surface: #1c1c1e;
  --surface-strong: #2c2c2e;
  --blue: #2997ff;
  --blue-hover: #40a9ff;
  --blue-tint: #102a43;
  --on-blue: #ffffff;
  --icon: #98989d;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"],
  html:not([data-theme]) {
    color-scheme: dark;
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #98989d;
    --rule: #38383a;
    --rail: #2c2c2e;
    --surface: #1c1c1e;
    --surface-strong: #2c2c2e;
    --blue: #2997ff;
    --blue-hover: #40a9ff;
    --blue-tint: #102a43;
    --on-blue: #ffffff;
    --icon: #98989d;
  }
}

.npesl-back {
  position: sticky;
  top: max(12px, env(safe-area-inset-top, 0px));
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 20px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--surface);
  color: var(--fg);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.npesl-back svg {
  width: 14px;
  height: 14px;
  flex: none;
}

.npesl-back:hover { background: var(--surface-strong); }
.npesl-back:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.npesl-theme {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(16px, env(safe-area-inset-bottom, 0px));
  z-index: 9999;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI Variable", "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
}

.npesl-theme-fab {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: var(--surface);
  color: var(--fg);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.14);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.npesl-theme-fab:hover { background: var(--surface-strong); }
.npesl-theme-fab:active { transform: scale(0.96); }
.npesl-theme-fab:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.npesl-theme-fab svg { width: 21px; height: 21px; display: block; }

.npesl-theme-menu {
  position: absolute;
  right: 0;
  bottom: 54px;
  display: none;
  min-width: 158px;
  padding: 6px;
  border: 1px solid var(--rule);
  border-radius: 16px;
  background: var(--bg);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.npesl-theme-menu[data-open="true"] { display: block; }

.npesl-theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--fg);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.npesl-theme-option:hover { background: var(--surface); }
.npesl-theme-option:focus-visible { outline: 2px solid var(--blue); outline-offset: -2px; }

.npesl-theme-swatch {
  flex: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--rule);
  border-radius: 50%;
}

.npesl-theme-swatch[data-swatch="auto"] {
  background: linear-gradient(90deg, #ffffff 50%, #000000 50%);
}
.npesl-theme-swatch[data-swatch="bright"] { background: #ffffff; }
.npesl-theme-swatch[data-swatch="dark"] { background: #000000; }
.npesl-theme-swatch[data-swatch="sepia"] { background: #f6efe0; }

.npesl-theme-check {
  margin-left: auto;
  color: var(--blue);
  font-size: 14px;
  opacity: 0;
}

.npesl-theme-option[aria-checked="true"] .npesl-theme-check { opacity: 1; }

@media print {
  .npesl-theme { display: none !important; }
}