/* ============================================================
   Railstons GmbH — railstons.ch
   Single-page company site. Direction B "Signal": the
   railstons.com palette, so the Ltd's site and the GmbH's read
   as a family even though the companies are separate.

   Colour lives ONLY in the two token blocks below — one for
   light, one for dark. Nothing after them names a colour, which
   is what makes the dark theme a change of six values rather
   than a second stylesheet.
   ============================================================ */

/* Self-hosted variable fonts (SIL OFL 1.1), Latin subset — the same
   files as railstons.com, so no request ever leaves for Google. */
@font-face{font-family:'Sora';font-style:normal;font-weight:400 700;font-display:swap;
  src:url("/fonts/sora-latin-var.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Inter';font-style:normal;font-weight:400 600;font-display:swap;
  src:url("/fonts/inter-latin-var.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  /* Palette — taken from railstons.com rather than re-picked, on purpose. */
  --bg:#ffffff;
  --bg-soft:#f5f7fb;
  --surface:#ffffff;
  --ink:#101828;          /* 16.4:1 on --bg  AAA */
  --ink-soft:#51586a;     /*  7.4:1 on --bg  AAA */
  --ink-faint:#9aa1b2;    /*  3.1:1 — large or decorative text only */
  --accent:#1e6fd9;       /*  4.9:1 on --bg  AA  */
  --accent-ink:#0d2a52;
  --accent-soft:#e9f1fd;
  --accent-contrast:#ffffff;
  --warm:#b8470e;         /*  5.2:1 on --warm-soft — the .com orange darkened,
                              because #f26b1d carries white text at only 2.6:1 */
  --warm-soft:#fff1e8;
  --line:#e6e9f0;
  --line-strong:#c8cedb;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 10px 30px rgba(16,24,40,.07);

  --display:'Sora','Inter',-apple-system,sans-serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --max:1080px;
  --gutter:clamp(1rem,5vw,2.5rem);
  --r:14px;
  --r-sm:10px;
  --hairline:1px;
}

/* Blue and orange are tuned for white; both go muddy on a dark ground, so
   both LIFT here rather than darken. Ratios are against the dark --bg. */
[data-theme="dark"]{
  --bg:#0f1319;
  --bg-soft:#171c24;
  --surface:#171c24;
  --ink:#e6eaf2;          /* 15.5:1  AAA */
  --ink-soft:#98a2b8;     /*  7.3:1  AAA */
  --ink-faint:#7d8798;    /*  5.1:1  AA  */
  --accent:#4f9bff;       /*  6.6:1  AA  */
  --accent-ink:#bcd9ff;   /* role inverts: on dark the "ink" is the LIGHTER tone */
  --accent-soft:#12233c;
  --accent-contrast:#0f1319;
  --warm:#ff8a4c;         /*  8.0:1  AAA */
  --warm-soft:#2a1a10;
  --line:#252c3a;
  --line-strong:#3a4356;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.45);
}

/* ============================================================
   BASE
   ============================================================ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:1.0625rem;          /* rem, so it scales with the reader's own size */
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
h1,h2,h3{font-family:var(--display);line-height:1.12;margin:0 0 .5em;
  letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(2.1rem,6.2vw,3.9rem)}
h2{font-size:clamp(1.55rem,3.6vw,2.4rem)}
h3{font-size:1.1rem;line-height:1.3;letter-spacing:-.01em}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
section{padding-block:clamp(3rem,8vw,5.5rem)}
.lede{font-size:clamp(1.05rem,2.1vw,1.25rem);color:var(--ink-soft);max-width:60ch}
.eyebrow{
  font-family:var(--sans);font-size:.75rem;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin:0 0 .9rem;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:40;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:var(--hairline) solid var(--line);
}
@supports not (background:color-mix(in srgb,red 50%,transparent)){
  .site-header{background:var(--bg)}
}
.site-header .wrap{display:flex;align-items:center;gap:1rem;
  min-height:4rem;padding-block:.6rem;flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:.5rem;font-family:var(--display);
  font-weight:700;letter-spacing:-.02em;color:var(--ink);text-decoration:none;font-size:1.05rem}
.brand .ch{color:var(--accent);font-weight:600}
.nav{margin-left:auto;display:flex;align-items:center;gap:clamp(.75rem,2.5vw,1.6rem);flex-wrap:wrap}
.nav a{color:var(--ink-soft);text-decoration:none;font-size:.95rem;font-weight:500}
.nav a:hover{color:var(--ink)}
.theme-toggle{
  background:none;border:var(--hairline) solid var(--line);color:var(--ink-soft);
  border-radius:var(--r-sm);width:2.3rem;height:2.3rem;cursor:pointer;
  display:grid;place-items:center;font-size:1rem;flex:none;
}
.theme-toggle:hover{color:var(--ink);border-color:var(--line-strong)}

/* ============================================================
   HERO
   ============================================================ */
.hero{padding-block:clamp(3.5rem,11vw,7rem) clamp(2.5rem,7vw,4.5rem)}
.hero .flag{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--accent-ink);background:var(--accent-soft);
  padding:.4rem .75rem;border-radius:999px;margin-bottom:1.4rem;
}
.hero h1{max-width:22ch}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lede{margin-top:1.2rem;font-size:clamp(1.1rem,2.3vw,1.35rem)}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:2rem}
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--sans);font-size:1rem;font-weight:600;
  padding:.7rem 1.25rem;border-radius:var(--r-sm);
  border:var(--hairline) solid transparent;text-decoration:none;cursor:pointer;
}
.btn-primary{background:var(--accent);color:var(--accent-contrast)}
.btn-primary:hover{background:var(--accent-ink);color:var(--accent-contrast)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:none}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ============================================================
   WHAT WE BUILD
   ============================================================ */
.cards{display:grid;gap:clamp(1rem,2.5vw,1.5rem);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));margin-top:2rem}
.card{
  background:var(--surface);border:var(--hairline) solid var(--line);
  border-radius:var(--r);padding:clamp(1.25rem,2.5vw,1.75rem);box-shadow:var(--shadow);
}
.card h3{margin-bottom:.4rem}
.card p{color:var(--ink-soft);margin:0;font-size:.98rem}
.card .ico{
  width:2.5rem;height:2.5rem;border-radius:var(--r-sm);display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent-ink);margin-bottom:1rem;flex:none;
}
.card .ico svg{width:1.3rem;height:1.3rem;stroke:currentColor;fill:none;stroke-width:1.7}

/* ============================================================
   PRODUCTS
   ============================================================ */
.products{background:var(--bg-soft);border-block:var(--hairline) solid var(--line)}
.product{
  background:var(--surface);border:var(--hairline) solid var(--line);
  border-radius:var(--r);padding:clamp(1.25rem,3vw,2rem);box-shadow:var(--shadow);
}
.product + .product{margin-top:1.25rem}
.product-head{display:flex;align-items:flex-start;gap:1rem;flex-wrap:wrap}
.product-head h3{font-size:1.35rem;margin:0}
.pill{
  font-size:.72rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  padding:.3rem .6rem;border-radius:999px;white-space:nowrap;
  background:var(--warm-soft);color:var(--warm);
  border:var(--hairline) solid transparent;
}
/* Nothing is shipping yet, so this one is a statement of fact, not a flag. */
.pill-soon{background:none;color:var(--ink-soft);border-color:var(--line-strong)}
.product p{color:var(--ink-soft);margin:.2rem 0 0;max-width:62ch}
.product .meta{display:flex;flex-wrap:wrap;gap:.4rem 1.25rem;margin-top:1rem;
  font-size:.9rem;color:var(--ink-faint)}
.product .meta b{color:var(--ink-soft);font-weight:600}
.product .more{margin-top:1rem;font-weight:600;font-size:.95rem;display:inline-block}

/* ============================================================
   HOW WE WORK
   ============================================================ */
.commits{list-style:none;padding:0;margin:2rem 0 0;display:grid;gap:1.1rem;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,19rem),1fr))}
.commits li{padding-left:1.9rem;position:relative;color:var(--ink-soft);font-size:.98rem}
.commits li::before{
  content:"";position:absolute;left:0;top:.52em;width:.75rem;height:.75rem;
  border-radius:50%;border:2px solid var(--accent);
}
.commits b{display:block;color:var(--ink);font-weight:600;font-size:1rem;margin-bottom:.15rem}

/* ============================================================
   CONTACT + IMPRESSUM
   ============================================================ */
.contact-grid{display:grid;gap:clamp(1.5rem,4vw,3rem);margin-top:2rem;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,16rem),1fr))}
.contact-block h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.12em;
  color:var(--accent);font-family:var(--sans);margin-bottom:.6rem}
.contact-block address{font-style:normal;color:var(--ink-soft);line-height:1.8}
.contact-block .quiet{color:var(--ink-faint)}
.contact-block a{font-weight:500}
.sister{
  margin-top:clamp(2rem,5vw,3rem);padding:clamp(1rem,2.5vw,1.5rem);
  border:var(--hairline) solid var(--line);border-radius:var(--r);
  background:var(--surface);font-size:.98rem;color:var(--ink-soft);
}
.sister b{color:var(--ink)}

.site-footer{border-top:var(--hairline) solid var(--line);padding-block:2rem;
  color:var(--ink-faint);font-size:.88rem}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:.6rem 1.5rem;align-items:center}
.site-footer a{color:var(--ink-soft);text-decoration:none}
.site-footer a:hover{color:var(--accent);text-decoration:underline}
.site-footer .spacer{margin-left:auto}

/* ============================================================
   SCROLL REVEAL
   Guarded by .js, so with JavaScript off or broken nothing is
   ever left invisible.
   ============================================================ */
.js .reveal{opacity:0;transform:translateY(14px);
  transition:opacity .6s ease,transform .6s ease}
.js .reveal.visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
}

/* ============================================================
   NARROW SCREENS
   Checked at 375px with the root font at 135%, the largest
   standard iPhone text size — the size this will be read at.
   ============================================================ */
@media (max-width:560px){
  /* The section links are a convenience on a page this short; the brand
     and the light/dark control are not. Dropping them keeps the header
     one row tall even at 135% text. */
  .nav a{display:none}
  .site-header .wrap{min-height:3.2rem}
}
@media (max-width:420px){
  .cta-row .btn{flex:1 1 100%;justify-content:center}
}