/* NFS Files help site — v2 design, 2026-09-19.
   Product-page polish on the home hero; calm documentation typography
   everywhere else. System fonts only, no webfont downloads. */

:root {
  --accent: #0da3ad;
  --accent-dark: #087f87;
  --accent-ink: #045e66;
  --ink: #1c1c1e;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --panel: #f2f7f8;
  --card: #ffffff;
  --warn: #fff6e5;
  --warn-line: #f0b64a;
  --code-bg: #eef2f4;
  --pre-bg: #0f1b2d;
  --pre-ink: #d6e6f2;
  --hero-1: #062b30;
  --hero-2: #0a4a52;
  --hero-glow: #0da3ad;
  --max: 760px;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(0 0 0 / .06), 0 8px 24px -12px rgb(0 0 0 / .18);
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f7;
    --muted: #a1a1a6;
    --line: #2c2c2e;
    --panel: #12272b;
    --card: #1c1c1e;
    --warn: #2e2410;
    --warn-line: #b8862d;
    --code-bg: #1f2a2e;
    --pre-bg: #0b1421;
    --accent-ink: #4fd0d8;
    --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 8px 24px -12px rgb(0 0 0 / .6);
  }
  body { background: #000; }
  .feature, .cards a, .stuck { background: var(--card); }
}
* { 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(--ink);
  background: #fff;
}
a { color: var(--accent-dark); text-underline-offset: 2px; }
@media (prefers-color-scheme: dark) { a { color: #4fd0d8; } }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
.top {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 82%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.top nav { display: flex; align-items: center; justify-content: space-between; height: 58px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 17px; color: inherit; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 8px; box-shadow: 0 1px 4px rgb(0 0 0 / .25); }
.links { display: flex; align-items: center; gap: 4px; overflow-x: auto; white-space: nowrap; }
.links a { color: var(--muted); text-decoration: none; font-size: 15px; padding: 7px 11px; border-radius: 9px; }
.links a:hover { color: var(--ink); background: var(--panel); }
.links .store { color: var(--accent-ink); font-weight: 600; }
@media (max-width: 520px) { .links a:not(.store) { display: none; } }

/* ---------- page ---------- */
.page { padding: 30px 20px 52px; }
.kicker {
  display: inline-block; margin: 0 0 10px; font-size: 13px; font-weight: 600;
  color: var(--accent-ink); text-transform: uppercase; letter-spacing: .06em;
  background: var(--panel); border: 1px solid var(--line);
  padding: 3px 10px; border-radius: 999px;
}
.kicker code { text-transform: none; letter-spacing: 0; background: none; padding: 0; }
h1 { font-size: clamp(28px, 4.5vw, 34px); line-height: 1.18; margin: 0 0 10px; letter-spacing: -.02em; }
.summary { font-size: 19px; color: var(--muted); margin: 0 0 26px; line-height: 1.55; }
h2 { font-size: 23px; margin: 38px 0 10px; letter-spacing: -.01em; }
h3 { font-size: 18px; margin: 26px 0 8px; }
p, li { font-size: 17px; }
ul, ol { padding-left: 24px; }
li { margin: 5px 0; }
li::marker { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--line); margin: 34px 0; }
code { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: .9em; background: var(--code-bg); padding: 1px 6px; border-radius: 5px; }
pre { background: var(--pre-bg); color: var(--pre-ink); padding: 15px 17px; border-radius: 12px; overflow-x: auto; font-size: 14.5px; line-height: 1.55; box-shadow: var(--shadow); }
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
kbd { font-family: inherit; font-size: .9em; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; }
table { border-collapse: collapse; width: 100%; font-size: 15.5px; margin: 14px 0; }
th, td { text-align: left; padding: 9px 11px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; background: var(--panel); }
tr:first-child th:first-child { border-radius: 8px 0 0 0; }
tr:first-child th:last-child { border-radius: 0 8px 0 0; }
img.shot { max-width: 100%; border-radius: 12px; border: 1px solid var(--line); box-shadow: var(--shadow); }
.callout { background: var(--panel); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; padding: 14px 18px; margin: 22px 0; }
.callout p:first-child { margin-top: 0; } .callout p:last-child { margin-bottom: 0; }
.callout.warn { background: var(--warn); border-left-color: var(--warn-line); }
.nas-jump { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin: 0 0 22px; font-size: 16px; }
.steps li { margin: 9px 0; }

/* guide / error cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 12px; margin: 18px 0 10px; padding: 0; list-style: none; }
.cards li { margin: 0; }
.cards a {
  display: block; padding: 16px 17px; border: 1px solid var(--line);
  border-radius: var(--radius); text-decoration: none; color: inherit;
  height: 100%; background: var(--card); transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.cards a:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.cards strong { display: block; margin-bottom: 4px; font-size: 16.5px; }
.cards span { color: var(--muted); font-size: 15px; }
.errlist { list-style: none; padding: 0; }
.errlist li { padding: 11px 0; border-bottom: 1px solid var(--line); margin: 0; }
.errlist li a { text-decoration: none; font-weight: 600; }
.errlist li a:hover { text-decoration: underline; }
.errlist code { margin-right: 8px; }
.errlist span { color: var(--muted); font-weight: 400; }

/* ---------- home hero (full-bleed) ---------- */
.hero-full {
  margin: -30px calc(50% - 50vw) 0;
  padding: 64px calc(50vw - 50%) 56px;
  background:
    radial-gradient(560px 300px at 18% 0%, rgb(13 163 173 / .45), transparent 65%),
    radial-gradient(640px 340px at 85% 20%, rgb(64 190 200 / .28), transparent 60%),
    linear-gradient(165deg, var(--hero-1), var(--hero-2) 70%, #07333a);
  color: #fff;
  text-align: center;
  overflow: hidden;
}
.hero { max-width: 720px; margin: 0 auto; padding: 0 20px; }
.hero img.appicon {
  width: 108px; height: 108px; border-radius: 26px;
  box-shadow: 0 2px 6px rgb(0 0 0 / .4), 0 20px 50px -12px rgb(0 0 0 / .55);
}
.hero h1 { color: #fff; font-size: clamp(34px, 6vw, 48px); margin: 18px 0 10px; letter-spacing: -.025em; }
.hero .tag { font-size: clamp(17px, 2.6vw, 20px); color: rgb(255 255 255 / .82); margin: 0 auto 26px; max-width: 600px; line-height: 1.55; }
.hero .pills { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin: 0 0 24px; padding: 0; list-style: none; }
.hero .pills li {
  margin: 0; font-size: 13.5px; font-weight: 600; color: rgb(255 255 255 / .9);
  border: 1px solid rgb(255 255 255 / .28); border-radius: 999px; padding: 4px 13px;
  background: rgb(255 255 255 / .08);
}
.cta-row { display: flex; gap: 12px; justify-content: center; align-items: center; flex-wrap: wrap; }
.badge-store {
  display: inline-flex; align-items: center; gap: 10px;
  background: #000; color: #fff !important; text-decoration: none;
  border: 1px solid rgb(255 255 255 / .25); border-radius: 12px; padding: 9px 18px 9px 14px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.badge-store:hover { transform: translateY(-2px); box-shadow: 0 12px 28px -10px rgb(0 0 0 / .6); }
.badge-store svg { flex: none; }
.badge-store .t { text-align: left; line-height: 1.25; }
.badge-store .t small { display: block; font-size: 11px; color: rgb(255 255 255 / .75); }
.badge-store .t strong { font-size: 18px; font-weight: 600; }
.cta-ghost {
  display: inline-block; color: #fff !important; text-decoration: none; font-weight: 600;
  border: 1px solid rgb(255 255 255 / .35); border-radius: 12px; padding: 12px 20px;
  background: rgb(255 255 255 / .08); transition: background .15s ease;
}
.cta-ghost:hover { background: rgb(255 255 255 / .16); }
.hero .trust { margin: 22px 0 0; font-size: 14px; color: rgb(255 255 255 / .65); }

/* ---------- home sections ---------- */
.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 12px; margin: 20px 0 8px; }
.feature {
  padding: 18px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); transition: transform .15s ease, box-shadow .15s ease;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.feature .ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 11px; margin-bottom: 10px;
  background: rgb(13 163 173 / .13); color: var(--accent-ink);
}
.feature h3 { margin: 0 0 6px; font-size: 16.5px; }
.feature p { margin: 0; font-size: 15px; color: var(--muted); }
.help-panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; margin: 26px 0; }
.help-panel h2 { margin-top: 0; }
.help-panel ul { margin-bottom: 0; }
.pro-dark {
  margin: 30px 0 8px; padding: 28px 28px 30px; border-radius: 18px; color: #fff;
  background:
    radial-gradient(400px 220px at 90% 0%, rgb(13 163 173 / .5), transparent 65%),
    linear-gradient(150deg, #101828, #0a2e34 75%);
  box-shadow: var(--shadow);
}
.pro-dark h2 { margin: 0 0 8px; color: #fff; }
.pro-dark p { color: rgb(255 255 255 / .82); margin: 0 0 6px; }
.pro-dark ul { margin: 12px 0 20px; padding-left: 22px; }
.pro-dark li { color: rgb(255 255 255 / .88); font-size: 16px; }
.pro-dark li::marker { color: #4fd0d8; }
.pro-dark .cta-row { justify-content: flex-start; }

/* ---------- ad + stuck + footer ---------- */
.ad { margin: 38px 0 8px; min-height: 90px; }
html.pro .ad { display: none; }
.stuck { margin: 38px 0 0; padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.stuck h2 { margin: 0 0 8px; font-size: 19px; }
.stuck p { margin: 0; font-size: 16px; }
footer.foot { border-top: 1px solid var(--line); }
.foot-in {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px;
  padding: 30px 20px 10px; max-width: var(--max); margin: 0 auto; text-align: left;
}
.foot-in h4 { margin: 0 0 8px; font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.foot-in ul { list-style: none; margin: 0; padding: 0; }
.foot-in li { margin: 5px 0; font-size: 15px; }
.foot-in li a { color: inherit; text-decoration: none; }
.foot-in li a:hover { color: var(--accent-ink); }
.foot-brand { font-size: 15px; color: var(--muted); }
.foot-brand strong { display: block; color: var(--ink); font-size: 16px; margin-bottom: 4px; }
.foot-brand p { font-size: 14.5px; margin: 0; }
.foot .fine { max-width: var(--max); margin: 0 auto; padding: 14px 20px 24px; color: var(--muted); font-size: 12.5px; text-align: center; }
@media (max-width: 600px) { .foot-in { grid-template-columns: 1fr 1fr; } }