/* Shared styles: colour tokens, base layout and form controls.
   Look: warm light grey with a muted, earthy palette (deep teal, sand, sage) and subtle
   grainy gradients. Light theme only. */

:root {
  --bg: #e4e3dc;
  --surface: #f0efe9;
  --surface-raised: #f8f7f2;
  --text: #1d2624;
  --muted: #66706a;
  --border: #d4d3c9;
  --border-strong: #b1b3a7;
  --ink: #24403b;            /* deep teal: primary buttons, selected toggles, step numbers */
  --ink-hover: #2d4f49;
  --accent: #e8d59a;         /* warm sand: text and highlights on the deep teal */
  --accent-strong: #2f6b62;  /* teal: links, focus rings, checkboxes on light grey */
  --danger: #a33a2c;
  --radius: 12px;
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --font-display: var(--font);

  /* Film grain, as a tiling noise texture (inline SVG, so it works from file://): grey
     fractal noise with its contrast stretched 4x, at 16% opacity (about ±6 levels).
     Layer it on top of gradients for the grainy-gradient look. */
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncR type='linear' slope='4' intercept='-1.5'/%3E%3CfeFuncG type='linear' slope='4' intercept='-1.5'/%3E%3CfeFuncB type='linear' slope='4' intercept='-1.5'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url%28%23n%29' opacity='0.16'/%3E%3C/svg%3E");
  --grain-soft: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncR type='linear' slope='4' intercept='-1.5'/%3E%3CfeFuncG type='linear' slope='4' intercept='-1.5'/%3E%3CfeFuncB type='linear' slope='4' intercept='-1.5'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url%28%23n%29' opacity='0.08'/%3E%3C/svg%3E");  /* same noise at half strength (about ±3 levels) */
  color-scheme: light;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

/* Form controls */
.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field > span { font-size: 0.8rem; color: var(--muted); }
.field-row { display: flex; align-items: center; gap: 0.5rem; }

input, select, button {
  font: inherit;
  color: var(--text);
}
input[type="number"], select {
  min-height: 2.25rem;
  padding: 0.3rem 0.6rem;
  background: var(--surface-raised);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
}
input[type="number"]:hover:not(:disabled), select:hover:not(:disabled) { border-color: var(--text); }
input[type="number"]::placeholder { color: #9aa098; }
input:disabled, select:disabled { opacity: 0.55; }
input[type="number"] { width: 6rem; }
input[type="range"] { accent-color: var(--accent-strong); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.5rem;
  padding: 0.4rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--ink);
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
.button:hover:not(:disabled) { background: var(--ink-hover); }
.button.secondary {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.button.secondary:hover:not(:disabled) { background: rgba(29, 38, 36, 0.05); border-color: var(--text); }
.button:disabled { opacity: 0.45; cursor: not-allowed; }

.error { color: var(--danger); margin: 0; }
.muted { color: var(--muted); }