/* Linkstars corporate site.
   Cool and precise, deliberately unlike Fellowship Ledger's warm parchment —
   a parent should not look like a bigger version of its product. */

:root {
  --ground:      #FFFFFF;
  --ground-sunk: #F5F6F9;
  --raised:      #FFFFFF;
  --ink:         #0E1220;
  --ink-soft:    #4B5468;
  --ink-faint:   #737C90;
  --rule:        #E4E7EE;
  --rule-strong: #C8CDDA;
  --accent:      #3B4FD8;
  --accent-ink:  #2B3AAE;
  --accent-wash: #EEF0FE;
  --block:       #0E1220;
  --block-ink:   #F3F5FA;
  --block-soft:  #9AA3B8;
  --block-rule:  #232939;
  --shadow: 0 1px 0 rgba(14,18,32,.04), 0 20px 44px -30px rgba(14,18,32,.45);

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --wrap: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground:      #0B0E17;
    --ground-sunk: #070A11;
    --raised:      #121724;
    --ink:         #EEF1F7;
    --ink-soft:    #A2AABC;
    --ink-faint:   #838C9F;
    --rule:        #212836;
    --rule-strong: #343D50;
    --accent:      #8D9CFF;
    --accent-ink:  #A9B4FF;
    --accent-wash: #171C33;
    --block:       #EEF1F7;
    --block-ink:   #0B0E17;
    --block-soft:  #4C5567;
    --block-rule:  #D3D9E6;
    --shadow: 0 1px 0 rgba(0,0,0,.4), 0 20px 44px -30px rgba(0,0,0,.9);
  }
}

*, *::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(--ground);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 24px; }

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 10;
  background: var(--ink); color: var(--ground); padding: 10px 16px; border-radius: 0 0 6px 0;
}
.skip:focus { left: 0; }

/* ---- head ---- */

.site-head {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--ground) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.head-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 66px; }

.brand {
  display: inline-flex; align-items: center; gap: 9px;
  color: var(--ink); text-decoration: none;
  font-weight: 600; font-size: 17px; letter-spacing: -0.02em;
}
.brand .mark { color: var(--accent); flex: none; }

.site-head nav { display: flex; gap: 4px; }
.site-head nav a {
  color: var(--ink-soft); text-decoration: none;
  font-size: 15px; padding: 7px 12px; border-radius: 7px;
}
.site-head nav a:hover { color: var(--ink); background: var(--ground-sunk); }
.site-head nav a[aria-current="page"] { color: var(--ink); font-weight: 550; }

/* ---- type ---- */

h1, h2, h3 { letter-spacing: -0.028em; line-height: 1.15; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 1.35rem + 3vw, 3.4rem); font-weight: 620; }
h2 { font-size: clamp(1.45rem, 1.15rem + 1.2vw, 2rem); font-weight: 600; }
h3 { font-size: 1.075rem; font-weight: 600; }
p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }

.eyebrow {
  font: 500 12px/1 var(--mono);
  letter-spacing: .13em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 18px;
}
.lede { font-size: clamp(1.05rem, 1rem + .35vw, 1.28rem); color: var(--ink-soft); max-width: 62ch; }
.prose { max-width: 68ch; }
.prose h2 { margin: 2.4em 0 .7em; }
.prose h3 { margin: 2em 0 .5em; }
.prose ul { margin: 0 0 1.05em; padding-left: 1.15em; }
.prose li { margin-bottom: .45em; }
.prose li::marker { color: var(--ink-faint); }

/* ---- sections ---- */

section { padding: clamp(56px, 7vw, 96px) 0; }
section + section { border-top: 1px solid var(--rule); }
section.sunk { background: var(--ground-sunk); }
section.hero { padding-top: clamp(64px, 9vw, 128px); }

.hero h1 { max-width: 17ch; }
.hero .lede { margin-top: 22px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 8px;
  font-size: 15px; font-weight: 550; text-decoration: none;
  border: 1px solid transparent; transition: background .15s, border-color .15s, color .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary { color: #0B0E17; } }
.btn-primary:hover { background: var(--accent-ink); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary:hover { color: #0B0E17; } }
.btn-ghost { border-color: var(--rule-strong); color: var(--ink); background: var(--raised); }
.btn-ghost:hover { border-color: var(--ink-faint); color: var(--ink); }

.grid { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; margin-top: 40px; }
@media (min-width: 720px) { .grid { grid-template-columns: 1fr 1fr; } }
.grid > div { background: var(--ground); padding: 28px; }
section.sunk .grid > div { background: var(--ground-sunk); }
.grid h3 { margin-bottom: 8px; }
.grid p { color: var(--ink-soft); font-size: 15.5px; margin: 0; }

/* ---- product ---- */

.product {
  margin-top: 40px; padding: clamp(26px, 4vw, 40px);
  background: var(--raised); border: 1px solid var(--rule);
  border-radius: 14px; box-shadow: var(--shadow);
}
.product-head { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 6px; }
.product-head h3 { font-size: 1.4rem; letter-spacing: -0.025em; }
.tag {
  font: 500 11px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent-ink); background: var(--accent-wash);
  padding: 5px 9px; border-radius: 999px; white-space: nowrap;
}
.product .tagline { color: var(--ink); font-weight: 500; margin: 0 0 16px; }
.product p { color: var(--ink-soft); max-width: 70ch; font-size: 16px; }
.product .visit { margin-top: 18px; display: inline-flex; align-items: center; gap: 7px; font-weight: 550; font-size: 15px; text-decoration: none; }
.product .visit:hover { text-decoration: underline; }

/* ---- contact / definition rows ---- */

.rows { margin-top: 36px; border-top: 1px solid var(--rule); }
.rows > div { display: grid; gap: 4px 32px; padding: 20px 0; border-bottom: 1px solid var(--rule); }
@media (min-width: 680px) { .rows > div { grid-template-columns: 200px 1fr; } }
.rows dt, .rows .k { font: 500 12px/1.5 var(--mono); letter-spacing: .11em; text-transform: uppercase; color: var(--ink-faint); padding-top: 3px; }
.rows dd, .rows .v { margin: 0; color: var(--ink); }
.rows address { font-style: normal; }

/* ---- call to action band ---- */

.band { background: var(--block); color: var(--block-ink); }
.band h2 { color: var(--block-ink); }
.band p { color: var(--block-soft); max-width: 58ch; margin-top: 14px; }
.band .btn-primary { background: var(--block-ink); color: var(--block); }
.band .btn-primary:hover { background: #fff; color: var(--block); }

/* ---- foot ---- */

.site-foot { border-top: 1px solid var(--rule); background: var(--ground-sunk); margin-top: 0; }
.foot-inner { display: grid; gap: 40px; padding-block: 56px 40px; }
@media (min-width: 760px) { .foot-inner { grid-template-columns: 1.5fr 1fr; } }
.foot-brand .brand { margin-bottom: 18px; }
.foot-brand p, .foot-brand address { margin: 0 0 10px; font-size: 14.5px; color: var(--ink-soft); font-style: normal; line-height: 1.6; }
.foot-brand .legal-name { color: var(--ink); font-weight: 550; }
.foot-nav { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.foot-nav h2 { font: 500 12px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint); margin-top: 6px; }
.foot-nav h2:first-child { margin-top: 0; }
.foot-nav a { font-size: 14.5px; color: var(--ink-soft); text-decoration: none; }
.foot-nav a:hover { color: var(--ink); text-decoration: underline; }
.foot-base {
  display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between;
  border-top: 1px solid var(--rule); padding-block: 22px;
  font-size: 13.5px; color: var(--ink-faint);
}
.foot-base p { margin: 0; }

@media (max-width: 520px) {
  .site-head nav a { padding: 7px 9px; font-size: 14px; }
  .brand span { font-size: 16px; }
}

/* Utilities. These exist so no page needs a style attribute, which is what
   lets the Content-Security-Policy stay free of 'unsafe-inline'. */
.prose > h2:first-child { margin-top: 0; }
.sub { color: var(--ink-soft); }

/* Grid cells now carry a lead line plus a body paragraph, and the strand
   cells link out from their heading. */
.grid p + p { margin-top: 10px; }
.grid .tagline { color: var(--ink); font-weight: 500; }
.grid h3 a { color: inherit; text-decoration: none; }
.grid h3 a:hover { color: var(--accent-ink); text-decoration: underline; }
.grid h3 a::after { content: " →"; color: var(--accent); font-weight: 400; }

/* ---- contact form ----
   A plain HTML form posting cross-origin. No JavaScript, so validation is the
   browser's own and the page still works with scripting off — which matters,
   because this is the one channel a reviewer might actually try. */

.form-wrap { display: grid; gap: clamp(36px, 5vw, 64px); align-items: start; }
@media (min-width: 860px) { .form-wrap { grid-template-columns: 1.05fr .95fr; } }

.contact-form {
  background: var(--raised); border: 1px solid var(--rule);
  border-radius: 14px; padding: clamp(24px, 3.5vw, 34px); box-shadow: var(--shadow);
}
.field { margin-bottom: 20px; }
.field label {
  display: block; margin-bottom: 7px;
  font: 500 12px/1.4 var(--mono); letter-spacing: .11em; text-transform: uppercase; color: var(--ink-faint);
}
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px;
  font: 400 16px/1.5 var(--sans); color: var(--ink);
  background: var(--ground); border: 1px solid var(--rule-strong); border-radius: 8px;
  transition: border-color .15s, box-shadow .15s;
}
.field textarea { resize: vertical; min-height: 132px; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-wash);
}
.field input:invalid:not(:placeholder-shown) { border-color: var(--rule-strong); }
.hint { font-size: 13.5px; color: var(--ink-faint); margin: 7px 0 0; }
.contact-form button { border: none; cursor: pointer; font-family: var(--sans); }
.contact-form > .hint { margin-top: 16px; }

/* The honeypot must be unreachable by people and invisible to assistive tech,
   while staying a real, submittable field for anything filling the form
   programmatically. display:none is skipped by some bots, so move it away. */
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-aside h2 { margin: 0 0 4px; }
.form-aside h3 { margin: 26px 0 6px; }
.form-aside p { color: var(--ink-soft); font-size: 15.5px; max-width: 58ch; }