/* Water Tally website — shared styles. No JavaScript, no external requests, no cookies. */

:root {
  --bg: #04101c;
  --bg-2: #071c30;
  --surface: rgba(255, 255, 255, 0.06);
  --border: rgba(120, 220, 255, 0.22);
  --text: #eaf6ff;
  --muted: #a9c3d6;
  --accent: #46d3ff;
  --accent-strong: #0aa5d6;
  --warn-bg: rgba(255, 176, 60, 0.12);
  --warn-border: rgba(255, 176, 60, 0.5);
  --radius: 16px;
  --max: 760px;
  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5fafe;
    --bg-2: #e6f3fb;
    --surface: #ffffff;
    --border: rgba(10, 100, 160, 0.2);
    --text: #0b2233;
    --muted: #4a6579;
    --accent: #0a74b0;
    --accent-strong: #075f92;
    --warn-bg: #fff6e5;
    --warn-border: #e9a53b;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%) fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--text); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: -999px; top: 8px; background: var(--accent-strong); color: #fff;
  padding: 8px 14px; border-radius: 8px; z-index: 10;
}
.skip-link:focus { left: 8px; }

/* Header */
.site-header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
  max-width: 1000px; width: 100%; margin: 0 auto; padding: 18px 20px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.3rem; }
.brand img { width: 38px; height: 38px; border-radius: 9px; }
nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; padding: 6px 2px; border-bottom: 2px solid transparent; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

/* Layout */
main { flex: 1; width: 100%; max-width: var(--max); margin: 0 auto; padding: 8px 20px 56px; }
main.wide { max-width: 1000px; }

h1 { font-size: clamp(2rem, 5vw, 2.6rem); line-height: 1.15; margin: 28px 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 1.4rem; margin: 2.2em 0 0.4em; line-height: 1.25; }
h3 { font-size: 1.1rem; margin: 1.6em 0 0.3em; }
p, li { color: var(--text); }
li { margin: 0.35em 0; }
.lead { font-size: 1.15rem; color: var(--muted); margin-top: 0; }
.meta { color: var(--muted); font-size: 0.92rem; margin: 0 0 26px; }
.muted { color: var(--muted); }

/* Summary / notice blocks */
.summary, .notice {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 22px; margin: 22px 0;
}
.summary h2, .notice h2 { margin-top: 0; font-size: 1.15rem; }
.summary ul { margin: 0.4em 0 0; padding-left: 1.2em; }
.notice.warning { background: var(--warn-bg); border-color: var(--warn-border); }
.notice p:last-child { margin-bottom: 0; }

/* Table of contents */
.toc { columns: 2 260px; column-gap: 32px; padding-left: 1.2em; margin: 0.6em 0 0; }
.toc li { break-inside: avoid; }

/* Landing */
.hero { text-align: center; padding: 36px 0 12px; }
.hero img.icon { width: 132px; height: 132px; border-radius: 30px; box-shadow: 0 18px 50px rgba(10, 165, 214, 0.35); }
.hero h1 { font-size: clamp(2.4rem, 7vw, 3.6rem); margin: 22px 0 6px; }
.hero .lead { max-width: 30em; margin: 0 auto 26px; }
.badge {
  display: inline-block; padding: 12px 22px; border-radius: 999px; background: var(--surface);
  border: 1px solid var(--border); color: var(--text); font-weight: 600;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 44px 0 8px; padding: 0; list-style: none; }
.features li { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; margin: 0; }
.features h3 { margin: 0 0 4px; font-size: 1.05rem; }
.features p { margin: 0; color: var(--muted); font-size: 0.97rem; }

/* FAQ */
details { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 4px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
details[open] summary { border-bottom: 1px solid var(--border); margin-bottom: 8px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 24px; padding: 26px 20px 40px; color: var(--muted); font-size: 0.9rem; }
.site-footer .inner { max-width: 1000px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.site-footer ul { display: flex; flex-wrap: wrap; gap: 6px 20px; list-style: none; margin: 0; padding: 0; }
.site-footer p { margin: 0; color: var(--muted); }

@media (max-width: 520px) {
  body { font-size: 16.5px; }
  .site-header { padding-top: 14px; }
}

@media print {
  body { background: #fff; color: #000; display: block; }
  nav, .site-footer ul, .skip-link { display: none; }
  a { color: #000; }
  .summary, .notice, details { border-color: #999; background: #fff; }
}