/* SpendTally pages — minimal, readable, mobile-first, dark-mode aware */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f7f9;
  --text: #0a0a0f;
  --text-soft: #4a4a55;
  --text-muted: #7a7a85;
  --border: #e5e5ea;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --code-bg: #f3f3f7;
  --max-w: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0f;
    --bg-soft: #15151c;
    --text: #f5f5f7;
    --text-soft: #b5b5be;
    --text-muted: #7a7a85;
    --border: #2a2a35;
    --accent: #60a5fa;
    --accent-soft: #1e3a8a;
    --code-bg: #1a1a23;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
}

nav {
  display: flex;
  gap: 20px;
  font-size: 15px;
  font-weight: 500;
}
nav a { color: var(--text-soft); }
nav a:hover { color: var(--text); text-decoration: none; }
nav a.active { color: var(--text); }

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 20px 80px;
}

h1 {
  font-size: 36px;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin: 0 0 12px;
  color: var(--text);
}

.lede {
  font-size: 19px;
  color: var(--text-soft);
  margin: 0 0 32px;
  line-height: 1.5;
}

h2 {
  font-size: 22px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 48px 0 12px;
  color: var(--text);
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 24px; }

h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 24px 0 8px;
  color: var(--text);
}

p { margin: 0 0 16px; color: var(--text-soft); }
p strong { color: var(--text); font-weight: 600; }

ul, ol {
  margin: 0 0 16px;
  padding-left: 24px;
  color: var(--text-soft);
}
li { margin: 4px 0; }

.meta {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0 0 32px;
}

code, kbd {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text);
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin: 0 0 16px;
}
.card p:last-child { margin-bottom: 0; }

.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px;
  margin: 0 0 20px;
  color: var(--text);
  font-size: 16px;
}
.callout p { color: var(--text); margin: 0; }

.qa {
  margin: 0 0 18px;
  padding: 18px 20px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.qa h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text);
}
.qa p:last-child { margin-bottom: 0; }

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  padding: 11px 20px;
  border-radius: 10px;
  margin: 0 8px 8px 0;
  transition: opacity 120ms;
}
.button:hover { opacity: 0.88; text-decoration: none; }
.button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 15px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-soft);
}
th {
  color: var(--text);
  font-weight: 600;
  background: var(--bg-soft);
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px 40px;
  font-size: 14px;
  color: var(--text-muted);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}
.footer-inner a { color: var(--text-muted); }
.footer-inner a:hover { color: var(--text); }

@media (max-width: 540px) {
  main { padding: 32px 18px 60px; }
  h1 { font-size: 30px; }
  .lede { font-size: 17px; }
  h2 { font-size: 20px; }
  .header-inner { padding: 14px 18px; }
  nav { gap: 14px; font-size: 14px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 8px; }
}