/* Base / site-wide */
:root {
  color-scheme: light;
  --bg: #f5f1e8;
  --panel: rgba(255,255,255,.84);
  --panel-strong: rgba(255,255,255,.96);
  --text: #2b241d;
  --muted: #6e655d;
  --border: rgba(69, 54, 38, .12);
  --shadow: 0 18px 50px rgba(20, 18, 15, .10);
  --button: #2f6fed;
  --button-text: #fff;
  --secondary-bg: rgba(32, 32, 36, .07);
  --secondary-text: #2b241d;
  --reader-bg: #efe6d3;
  --paper: #f8f4ea;
  --paper-text: #2b241d;
  --fold-shadow: rgba(26, 20, 14, .10);
  --progress: #2b241d;
  --transition: 500ms ease;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

body[data-theme="sepia"] {
  --bg: #eee0c5;
  --panel: rgba(255, 248, 236, .84);
  --panel-strong: rgba(255, 248, 236, .96);
  --text: #35291d;
  --muted: #77695a;
  --border: rgba(87, 68, 46, .15);
  --reader-bg: #e9dcc2;
  --paper: #f8efdd;
  --paper-text: #35291d;
  --fold-shadow: rgba(70, 52, 35, .12);
  --progress: #58432e;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #181613;
  --panel: rgba(34, 32, 29, .72);
  --panel-strong: rgba(30, 28, 25, .92);
  --text: #f1eadf;
  --muted: #b2aa9d;
  --border: rgba(255,255,255,.08);
  --button: #8cb5ff;
  --button-text: #0e1116;
  --secondary-bg: rgba(255,255,255,.08);
  --secondary-text: #f1eadf;
  --reader-bg: #11100f;
  --paper: #1b1917;
  --paper-text: #ece5d9;
  --fold-shadow: rgba(0, 0, 0, .38);
  --progress: #d7cfbf;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  transition: background-color var(--transition), color var(--transition);
}

button, input, select {
  font: inherit;
}

.shell {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.narrow {
  max-width: 560px;
  margin-inline: auto;
}

.card {
  width: min(100%, 520px);
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 28px;
  backdrop-filter: blur(16px);
  transition: background-color var(--transition), border-color var(--transition);
}

.stack {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

label {
  font-weight: 600;
}

input[type="text"], input[type="number"], input[type="password"], input[type="range"], select,
input:not([type]) {
  width: 100%;
}

input, select {
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.65);
  padding: 14px 16px;
  color: var(--text);
}

body[data-theme="dark"] input,
body[data-theme="dark"] select {
  background: rgba(255,255,255,.04);
}

button {
  border: 0;
  border-radius: 14px;
  padding: 12px 18px;
  background: var(--button);
  color: var(--button-text);
  cursor: pointer;
  transition: transform 160ms ease, opacity 160ms ease, background-color var(--transition), color var(--transition);
}

button:hover { opacity: .95; }
button:active { transform: translateY(1px); }

button.secondary {
  background: var(--secondary-bg);
  color: var(--secondary-text);
}

button.hidden { display: none !important; }

.message, .subtle {
  color: var(--muted);
  font-size: .95rem;
}