/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

/* ─── Design tokens ──────────────────────────────────────────── */
:root {
  --ink:        #0d1a30;
  --ink-soft:   #2a4068;
  --ink-muted:  #5a6b86;
  --paper:      #ffffff;
  --surface:    #ffffff;
  --line:       rgba(13,26,48,0.14);
  --cobalt:     #5a75fa;
  --cobalt-light:#a3b3ff;
  --cobalt-50:  #d9e1ff;
  --radius-sm:  8px;
  --radius-md:  12px;
  --display: 'Inter', system-ui, sans-serif;
  --sans:    'Inter', system-ui, sans-serif;
  --mono:    'Red Hat Mono', ui-monospace, monospace;
}

/* ─── Base ───────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }
body {
  background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.65; font-weight: 300;
  -webkit-font-smoothing: antialiased;
}
em { font-style: normal; }
a  { color: inherit; }

/* ─── Utilities ──────────────────────────────────────────────── */
.label {
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  letter-spacing: 0.28em; text-transform: uppercase; color: var(--ink-muted);
}
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

/* ─── Nav ────────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; padding: 28px 40px;
  transition: background 0.35s, box-shadow 0.35s, padding 0.35s;
}
.nav.scrolled {
  background: rgba(255,255,255,0.9); backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line); padding-top: 18px; padding-bottom: 18px;
}
.wordmark {
  font-family: var(--display); font-weight: 600; font-size: 20px;
  letter-spacing: -0.01em; color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
}
.brand-mark { height: 30px; width: auto; display: block; }
.nav-right { display: flex; align-items: center; gap: 32px; }
.nav-link {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-muted); text-decoration: none; transition: color 0.2s;
}
.nav-link:hover { color: var(--ink); }
.nav-link:focus-visible, .nav-cta:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 4px; border-radius: 3px; }
.nav-cta {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: #fff; background: var(--cobalt); text-decoration: none; padding: 11px 20px;
  border-radius: var(--radius-sm); transition: opacity 0.2s;
}
.nav-cta:hover { opacity: 0.85; }
@media (max-width: 820px) { .nav-links-hide { display: none; } }

/* ─── Buttons ────────────────────────────────────────────────── */
.btn-primary {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  background: var(--cobalt); color: #fff; text-decoration: none; padding: 15px 28px;
  border-radius: var(--radius-sm); transition: opacity 0.2s; display: inline-block;
  border: none; cursor: pointer;
}
.btn-primary:hover { opacity: 0.86; }
.btn-primary:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 3px; }

/* ─── Article shell ──────────────────────────────────────────── */
.article { padding: 168px 0 40px; }
.prose-wrap { max-width: 760px; margin: 0 auto; padding: 0 40px; }
.art-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-muted);
}
.art-meta .art-dot { opacity: 0.5; }
.art-body { border-top: 1px solid var(--line); padding-top: 44px; }
.art-body p { font-size: 16px; line-height: 1.85; color: var(--ink-soft); font-weight: 300; margin-bottom: 22px; max-width: 68ch; }
.art-body p strong { color: var(--ink); font-weight: 500; }
.art-body a { color: var(--cobalt); text-decoration: underline; text-underline-offset: 3px; }
.art-body a:hover { opacity: 0.8; }
.art-cta {
  margin-top: 60px; padding: 44px; border: 1px solid var(--line);
  border-radius: var(--radius-md); background: linear-gradient(135deg,#f4f6fe 0%,#eaeefb 100%); text-align: center;
}
.art-cta h3 { font-family: var(--display); font-weight: 500; font-size: clamp(22px, 2.6vw, 28px); letter-spacing: -0.02em; margin-bottom: 10px; }
.art-cta p  { color: var(--ink-soft); font-weight: 300; font-size: 15px; margin-bottom: 22px; }

/* ─── Footer ─────────────────────────────────────────────────── */
footer { background: var(--surface); color: var(--ink-muted); padding: 80px 0 40px; border-top: 1px solid var(--line); margin-top: 100px; }
.foot-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; flex-wrap: wrap; margin-bottom: 56px; }
.foot-word { font-family: var(--display); font-weight: 600; font-size: 20px; letter-spacing: -0.01em; color: var(--ink); display: inline-flex; align-items: center; gap: 10px; }
.foot-word img { height: 26px; width: auto; }
.foot-links { display: flex; gap: 40px; flex-wrap: wrap; align-items: center; }
.foot-links a { font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em; color: var(--ink-soft); text-decoration: none; transition: color 0.2s; }
.foot-links a:hover { color: var(--ink); }
.foot-links a:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 4px; border-radius: 3px; }
.foot-bottom { border-top: 1px solid var(--line); padding-top: 28px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.foot-bottom span { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--ink-muted); }

/* ─── Modal ──────────────────────────────────────────────────── */
.modal { position: fixed; inset: 0; z-index: 100; display: none; }
.modal.open { display: block; }
.modal-overlay { position: absolute; inset: 0; background: rgba(13,26,48,0.55); backdrop-filter: blur(4px); }
.modal-card {
  position: relative; z-index: 1; width: min(560px, calc(100% - 32px)); max-height: calc(100vh - 64px);
  overflow-y: auto; margin: 32px auto; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 40px; box-shadow: 0 40px 90px -30px rgba(13,26,48,0.55);
}
.modal-close {
  position: absolute; top: 18px; right: 20px; background: none; border: none; cursor: pointer;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-muted); transition: color 0.2s;
}
.modal-close:hover { color: var(--ink); }
.modal-close:focus-visible { outline: 2px solid var(--cobalt); outline-offset: 3px; }
.modal-card h2 {
  font-family: var(--display); font-weight: 500; font-size: clamp(26px, 3vw, 34px);
  letter-spacing: -0.02em; line-height: 1.1; margin-bottom: 10px; max-width: 18ch;
}
.modal-sub { color: var(--ink-soft); font-weight: 300; font-size: 15px; line-height: 1.6; margin-bottom: 28px; }
.modal-form { display: flex; flex-direction: column; gap: 18px; }
.field { display: block; }
.field > span {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-muted); margin-bottom: 8px;
}
.modal-form input, .modal-form textarea, .modal-form select {
  font-family: var(--sans); font-size: 15px; font-weight: 300; color: var(--ink);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 12px 14px; width: 100%; transition: border-color 0.2s, box-shadow 0.2s;
}
.modal-form textarea { resize: vertical; min-height: 96px; line-height: 1.6; }
.modal-form input::placeholder, .modal-form textarea::placeholder { color: var(--ink-muted); opacity: 0.7; }
.modal-form input:focus, .modal-form textarea:focus, .modal-form select:focus {
  outline: none; border-color: var(--cobalt); box-shadow: 0 0 0 3px rgba(90,117,250,0.12);
}
.modal-submit { align-self: flex-start; margin-top: 4px; }
.modal-success { text-align: center; padding: 8px 0 4px; }
.modal-success h3 { font-family: var(--display); font-weight: 500; font-size: 24px; letter-spacing: -0.02em; margin-bottom: 10px; }
.modal-success p  { color: var(--ink-soft); font-weight: 300; font-size: 15px; line-height: 1.6; }

/* ─── Scroll reveal ──────────────────────────────────────────── */
.reveal { transition: opacity 0.9s ease, transform 0.9s ease; }
.js-animations .reveal { opacity: 0; transform: translateY(20px); }
.js-animations .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js-animations .reveal { opacity: 1 !important; transform: none !important; transition: none; } }

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 760px) {
  .wrap        { padding: 0 24px; }
  .nav         { padding: 20px 24px; }
  .nav-right   { gap: 16px; }
  .nav-cta     { padding: 10px 16px; }
  .brand-mark  { height: 26px; }
  .wordmark    { font-size: 18px; gap: 8px; }
  .article     { padding-top: 128px; }
  .prose-wrap  { padding: 0 24px; }
  .art-cta     { padding: 36px 24px; }
  .modal-card  { padding: 30px 20px; margin: 16px auto; }
}