/* Shared by both entry points (index.html landing + app.html tool):
   design tokens, resets, and the topbar/brand/button primitives both pages
   build on. Page-specific rules live in landing.css or app.css instead. */

:root {
  --volt: #6be36b;
  --volt-bright: #8bff7a;
  --volt-deep: #2e8b3a;
  --volt-tint: #eefaec;
  --graphite: #14171a;
  --graphite-2: #1d2226;
  --paper: #f6f7f5;
  --ink: #14171a;
  --slate: #63706b;
  --slate-light: #8b968f;
  --line: #e3e6e1;
  --danger: #c9432f;
  --danger-tint: #fdeeec;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(20, 23, 26, 0.05), 0 1px 1px rgba(20, 23, 26, 0.04);
  --shadow-md: 0 2px 6px rgba(20, 23, 26, 0.06), 0 8px 24px rgba(20, 23, 26, 0.07);
  --shadow-lg: 0 16px 48px rgba(15, 18, 15, 0.18);

  --font-display: "IBM Plex Mono", monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
.hidden { display: none !important; }

/* No spinner arrows on number inputs anywhere — they only ever nudge by
   the field's step (often $0.01), which is never what anyone wants. */
input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

svg { display: block; flex-shrink: 0; }

/* ---------- topbar ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  background: var(--graphite);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 40;
}
.brand { display: flex; align-items: center; gap: 9px; font-family: var(--font-display); font-weight: 700; font-size: 15px; letter-spacing: 0.02em; }
a.brand { text-decoration: none; color: #fff; }
.brand-mark { background: var(--volt); color: var(--graphite); border-radius: 6px; padding: 3px 7px; font-size: 12px; }
.topbar-actions { display: flex; gap: 8px; align-items: center; }

/* ---------- buttons ---------- */

button, .file-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s, transform .05s, box-shadow .15s;
}
button:hover, .file-btn:hover { border-color: var(--slate-light); background: var(--paper); }
button:active, .file-btn:active { transform: translateY(1px); }
button:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.topbar-actions button, .topbar-actions .file-btn { background: transparent; color: #fff; border-color: rgba(255,255,255,0.22); }
.topbar-actions button:hover, .topbar-actions .file-btn:hover { border-color: #fff; background: rgba(255,255,255,0.06); }
.file-btn { display: inline-flex; align-items: center; }

.btn-primary {
  background: var(--volt); border-color: var(--volt); color: var(--graphite); font-weight: 600;
}
.btn-primary:hover { background: var(--volt-bright); border-color: var(--volt-bright); }
.btn-outline { background: transparent; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--slate); }
.btn-ghost:hover { color: var(--ink); border-color: transparent; background: var(--paper); text-decoration: none; }
a.btn-primary { text-decoration: none; display: inline-flex; }