/* UNISON CPA — design system
   Warm paper + umber, from the knot logo. Steady, established, unfussy. */
:root {
  --ink: #2e2620;
  --ink-soft: #6b5d50;
  --paper: #f7f3ec;
  --card: #ffffff;
  --line: #e5dcce;
  --umber: #8a6a4f;
  --umber-deep: #6b4f38;
  --head: "Archivo", "Helvetica Neue", sans-serif;
  --sans: "Lato", -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--sans); font-size: 1.0625rem; line-height: 1.75; color: var(--ink); background: var(--paper); }
img { max-width: 100%; height: auto; }

h1, h2, h3 { font-family: var(--head); font-weight: 700; line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1.2em; }
a { color: var(--umber-deep); }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header { background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: .8rem; padding-bottom: .8rem; }
.brand { display: flex; align-items: center; gap: .75rem; text-decoration: none; color: var(--ink); }
.brand img { height: 48px; width: auto; }
.site-nav a { margin-left: 1.6rem; text-decoration: none; color: var(--ink-soft); font-family: var(--head); font-weight: 600; font-size: .92rem; letter-spacing: .04em; }
.site-nav a:hover { color: var(--umber-deep); }

/* Hero */
.hero { position: relative; color: #fff; overflow: hidden; background: var(--ink); }
.hero .bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: .5; }
.hero .inner { position: relative; padding: 6rem 0; max-width: 620px; }
.hero h1 { color: #fff; text-shadow: 0 2px 18px rgba(0, 0, 0, .35); }
.hero p { color: #efe9df; font-size: 1.12rem; text-shadow: 0 1px 12px rgba(0, 0, 0, .4); }
.btn { display: inline-block; background: var(--umber); color: #fff; text-decoration: none; padding: .85rem 2.2rem; border: 0; border-radius: 6px; font-family: var(--head); font-weight: 700; letter-spacing: .04em; cursor: pointer; }
.btn:hover { background: var(--umber-deep); }

/* Sections */
section { padding: 4rem 0; }
.section-head { text-align: center; margin-bottom: 2.4rem; }
.section-head .rule { width: 64px; height: 3px; background: var(--umber); border: 0; margin: 1rem auto 0; }

/* Partners */
.partners { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.partner { display: grid; grid-template-columns: 240px 1fr; gap: 2.5rem; align-items: center; margin-bottom: 3rem; }
.partner:last-of-type { margin-bottom: 0; }
.partner img { border-radius: 10px; box-shadow: 0 10px 26px rgba(46, 38, 32, .18); }
.partner h3 { font-size: 1.35rem; }
.partner .role { color: var(--umber-deep); font-family: var(--head); font-weight: 600; font-size: .9rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: .6rem; }
@media (max-width: 680px) { .partner { grid-template-columns: 1fr; } .partner img { max-width: 260px; } }
.joint { text-align: center; max-width: 44em; margin: 3rem auto 0; color: var(--ink-soft); }

/* FAQ */
.faq { max-width: 780px; margin: 0 auto; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 8px; margin-bottom: .8rem; padding: 0 1.4rem; }
.faq summary { font-family: var(--head); font-weight: 600; padding: 1.1rem 0; cursor: pointer; list-style: none; position: relative; padding-right: 2rem; }
.faq summary::after { content: "+"; position: absolute; right: .2rem; top: 50%; transform: translateY(-50%); color: var(--umber); font-size: 1.4rem; font-weight: 400; }
.faq details[open] summary::after { content: "\2013"; }
.faq details p { color: var(--ink-soft); padding-bottom: 1.2rem; margin: 0; }

/* Native form */
.nform { display: grid; gap: 1rem; max-width: 560px; margin: 1.5rem auto 0; }
.nform input, .nform textarea {
  width: 100%; background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: .85rem 1rem; font-family: var(--sans); font-size: 1rem; color: var(--ink);
  outline: none; transition: border-color .2s ease;
}
.nform input:focus, .nform textarea:focus { border-color: var(--umber); }
.nform textarea { min-height: 130px; resize: vertical; }
.nform .btn { justify-self: center; }
.form-ok { text-align: center; color: var(--umber-deep); font-weight: 700; margin-top: 1.4rem; }
.form-ok[hidden] { display: none; }
.nform[hidden] { display: none; }

/* Links list */
.link-list { list-style: none; padding: 0; display: grid; gap: 1rem; max-width: 720px; margin: 0 auto; }
.link-list a { display: block; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--umber); border-radius: 8px; padding: 1.1rem 1.4rem; text-decoration: none; font-family: var(--head); font-weight: 600; }
.link-list a:hover { border-left-color: var(--umber-deep); transform: translateX(2px); }
.link-list .desc { display: block; font-family: var(--sans); font-weight: 400; color: var(--ink-soft); font-size: .95rem; }

/* Page title */
.page-title { text-align: center; padding: 3.5rem 1.25rem 0; }
.page-title .rule { width: 64px; height: 3px; background: var(--umber); border: 0; margin: 1rem auto 0; }

/* Footer */
.site-footer { background: var(--ink); color: #d9d0c3; padding: 3rem 1.25rem; }
.site-footer .wrap { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 2rem; }
.site-footer h4 { font-family: var(--head); color: #fff; margin: 0 0 .5rem; font-size: 1rem; letter-spacing: .06em; text-transform: uppercase; }
.site-footer p { margin: 0; }
.site-footer a { color: #efe9df; }
.site-footer .copyright { grid-column: 1 / -1; text-align: center; font-size: .85rem; color: #a89a87; border-top: 1px solid rgba(229, 220, 206, .2); padding-top: 1.5rem; margin-top: 1rem; }