:root {
  --bg: #fdc114;
  --fg: #ffffff;
  --muted: rgba(255, 255, 255, 0.85);
  --rule: rgba(255, 255, 255, 0.5);
  --code-bg: rgba(0, 0, 0, 0.15);
  --btn-bg: rgba(0, 0, 0, 0.12);
  --btn-bg-strong: rgba(0, 0, 0, 0.25);
  --btn-border: rgba(255, 255, 255, 0.6);
  --accent: #ffffff;
  --error: #2b0a00;

  --font: 'VT323', monospace;
  --base-size: 22px;
  --line-height: 1.4;
  --measure: 720px;
}

[data-theme="dark"] {
  --bg: #111111;
  --fg: #e8e8e8;
  --muted: rgba(232, 232, 232, 0.7);
  --rule: rgba(232, 232, 232, 0.25);
  --code-bg: rgba(255, 255, 255, 0.08);
  --btn-bg: rgba(255, 255, 255, 0.06);
  --btn-bg-strong: rgba(255, 255, 255, 0.14);
  --btn-border: rgba(232, 232, 232, 0.4);
  --accent: #fdc114;
  --error: #ffb4a4;
}

[data-theme="sepia"] {
  --bg: #f4ecd8;
  --fg: #5b4636;
  --muted: rgba(91, 70, 54, 0.75);
  --rule: rgba(91, 70, 54, 0.3);
  --code-bg: rgba(91, 70, 54, 0.12);
  --btn-bg: rgba(91, 70, 54, 0.08);
  --btn-bg-strong: rgba(91, 70, 54, 0.18);
  --btn-border: rgba(91, 70, 54, 0.4);
  --accent: #b07b3a;
  --error: #8a2a14;
}

[data-font="serif"]      { --font: 'Lora', Georgia, serif; --base-size: 18px; --line-height: 1.6; }
[data-font="plex-serif"] { --font: 'IBM Plex Serif', Georgia, serif; --base-size: 18px; --line-height: 1.6; }
[data-font="sans"]       { --font: 'Inter', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }
[data-font="ubuntu"]     { --font: 'Ubuntu', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }
[data-font="atkinson"]   { --font: 'Atkinson Hyperlegible', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  margin: 0;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page {
  max-width: var(--measure);
  margin: 60px auto;
  padding: 0 24px;
  font-size: var(--base-size);
  line-height: var(--line-height);
}

.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header h1 {
  font-weight: normal;
  font-size: 2.2em;
  margin: 8px 0 16px;
  flex: 1 1 auto;
  line-height: 1.1;
}

.back-link {
  color: var(--fg);
  text-decoration: none;
  font-size: 0.9em;
  opacity: 0.85;
}
.back-link:hover { opacity: 1; }

.reader-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  font-size: 0.85em;
}

.seg {
  display: inline-flex;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  overflow: hidden;
}

.seg button {
  font-family: inherit;
  font-size: inherit;
  background: transparent;
  color: var(--fg);
  border: 0;
  padding: 4px 10px;
  cursor: pointer;
  line-height: 1.2;
}

.seg button + button { border-left: 1px solid var(--btn-border); }
.seg button.active, .seg button:hover { background: var(--btn-bg); }

/* ---------- tools landing grid ---------- */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0 0 24px;
}

.tool-card {
  display: block;
  padding: 16px;
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  background: var(--btn-bg);
  color: var(--fg);
  text-decoration: none;
  transition: transform 0.15s ease, background-color 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  background: var(--btn-bg-strong);
}

.tool-card.featured {
  grid-column: 1 / -1;
  background: var(--btn-bg-strong);
  border-style: dashed;
}

.tool-card.coming {
  opacity: 0.45;
  pointer-events: none;
}

.tool-card .tool-icon {
  display: inline-block;
  font-size: 1.6em;
  line-height: 1;
  margin-right: 6px;
}

.tool-card .tool-title {
  font-size: 1.15em;
  display: block;
  margin: 0 0 4px;
}

.tool-card .tool-desc {
  font-size: 0.82em;
  opacity: 0.85;
}

.tool-card .tool-tag {
  font-size: 0.7em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.6;
  float: right;
  margin-top: 4px;
}

@media (max-width: 700px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .page-header h1 { font-size: 1.7em; }
}

@media (max-width: 420px) {
  .tool-grid { grid-template-columns: 1fr; }
}

/* ---------- form / tool body ---------- */

.field {
  display: block;
  margin: 0 0 14px;
}

.field label {
  display: block;
  font-size: 0.85em;
  opacity: 0.85;
  margin: 0 0 4px;
}

.field input[type="text"],
.field input[type="datetime-local"],
.field input[type="number"],
.field input[type="email"],
.field select,
.field textarea {
  width: 100%;
  box-sizing: border-box;
  font-family: inherit;
  font-size: 1em;
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 6px 10px;
}

.field textarea {
  min-height: 110px;
  resize: vertical;
  line-height: 1.4;
}

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

.field-row .field { flex: 1 1 200px; }

.field-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-size: 0.95em;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 16px;
}

.btn {
  font-family: inherit;
  font-size: 1em;
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 6px 14px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn.primary {
  background: var(--btn-bg-strong);
}

.btn:hover:not(:disabled) {
  background: var(--btn-bg-strong);
}

.btn:disabled { opacity: 0.5; cursor: default; }

.notice {
  margin: 0 0 16px;
  padding: 8px 12px;
  border-left: 3px solid var(--btn-border);
  background: var(--btn-bg);
  font-size: 0.9em;
}

.notice.error {
  color: var(--error);
  border-left-color: var(--error);
}

.preview {
  margin: 16px 0;
  padding: 14px 16px;
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  background: var(--btn-bg);
}

.preview .preview-title {
  font-size: 1.1em;
  margin: 0 0 4px;
}

.preview .preview-meta {
  font-size: 0.85em;
  opacity: 0.85;
}

pre.output {
  background: var(--code-bg);
  padding: 12px 14px;
  border-radius: 4px;
  overflow-x: auto;
  font-family: ui-monospace, 'SFMono-Regular', Menlo, monospace;
  font-size: 0.92em;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0 0 14px;
  min-height: 80px;
}

/* ---------- footer ---------- */

.site-footer {
  max-width: var(--measure);
  margin: 32px auto 40px;
  padding: 16px 24px 0;
  border-top: 1px dashed var(--rule);
  text-align: center;
  font-size: 0.8em;
  color: var(--muted);
}

.site-footer a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-style: dotted;
}

.site-footer a:hover { text-decoration-style: solid; }