/* =========================================================
   Blenheim Risk and Resilience Ltd — site stylesheet
   1. Tokens  2. Base  3. Layout  4. Components  5. Pages
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.25rem, 1rem + 4vw, 4.5rem);

  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;

  --font-display: 'Gambetta', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Satoshi', 'Segoe UI', system-ui, sans-serif;

  --radius-sm: 2px;
  --radius-md: 4px;
  --container: 1200px;
  --gutter: clamp(var(--space-5), 4vw, var(--space-12));
  --section-pad: clamp(var(--space-16), 8vw, var(--space-32));
  --header-h: 72px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

:root,
[data-theme='light'] {
  --color-bg: #f4f2ee;
  --color-surface: #fbfaf8;
  --color-surface-alt: #ebe8e2;
  --color-border: #d6d1c8;
  --color-divider: #e1ddd5;
  --color-text: #1b2230;
  --color-text-muted: #545c69;
  --color-primary: #1f3a5c;
  --color-primary-hover: #152a45;
  --color-on-primary: #f7f5f1;
  --color-accent: #8a6a2f;          /* brass: hairlines and indices only */
  --color-ink: #141b26;             /* dark bands, both themes */
  --color-on-ink: #ece8e0;
  --color-on-ink-muted: #b4b0a7;
  --color-focus: #2f6db3;
  --shadow-sm: 0 1px 2px rgb(20 27 38 / 0.06);
}

[data-theme='dark'] {
  --color-bg: #10151d;
  --color-surface: #161d27;
  --color-surface-alt: #1a222e;
  --color-border: #2c3644;
  --color-divider: #232c39;
  --color-text: #e7e3db;
  --color-text-muted: #a4a9b2;
  --color-primary: #a9c1e0;
  --color-primary-hover: #c3d5ec;
  --color-on-primary: #0f1620;
  --color-accent: #c9a865;
  --color-ink: #0b0f15;
  --color-on-ink: #ece8e0;
  --color-on-ink-muted: #a7a39b;
  --color-focus: #8fb6e6;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
}

/* ---------- 2. Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--space-6)); }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { margin: 0; line-height: 1.15; font-weight: 500; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; }
a { color: inherit; text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.skip-link {
  position: absolute; left: var(--space-4); top: -100px; z-index: 100;
  padding: var(--space-2) var(--space-4); background: var(--color-primary); color: var(--color-on-primary);
  font-size: var(--text-sm); text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

/* ---------- 3. Layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.narrow { max-width: 720px; }
.section { padding-block: var(--section-pad); }
.section-alt { background: var(--color-surface-alt); }
.section-head { max-width: 640px; margin-bottom: clamp(var(--space-10), 5vw, var(--space-16)); }

.split { display: grid; gap: var(--space-10); }
@media (min-width: 900px) {
  .split { grid-template-columns: 5fr 7fr; gap: var(--space-20); align-items: start; }
}

/* ---------- 4. Components ---------- */
/* Type helpers */
.eyebrow {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-accent); margin-bottom: var(--space-4);
  display: flex; align-items: center; gap: var(--space-3);
}
.eyebrow::before { content: ''; width: var(--space-6); height: 1px; background: currentColor; flex: none; }
.eyebrow-inverse { color: var(--color-on-ink-muted); }
.section-title { font-family: var(--font-display); font-size: var(--text-xl); }
.page-title { font-family: var(--font-display); font-size: var(--text-2xl); }
.lede { font-size: var(--text-base); color: var(--color-text-muted); max-width: 58ch; margin-top: var(--space-6); }
.prose { display: grid; gap: var(--space-5); max-width: 62ch; }
.prose p { color: var(--color-text-muted); }
.card-index { font-family: var(--font-display); font-size: var(--text-sm); color: var(--color-accent); letter-spacing: 0.04em; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 48px; padding: var(--space-3) var(--space-6);
  font: 500 var(--text-sm)/1.2 var(--font-body); text-decoration: none; letter-spacing: 0.01em;
  border: 1px solid transparent; border-radius: var(--radius-sm); cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn-sm { min-height: 40px; padding: var(--space-2) var(--space-4); }
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-ghost { border-color: var(--color-border); color: var(--color-text); background: transparent; }
.btn-ghost:hover { border-color: var(--color-text); }
.btn-light { background: var(--color-on-ink); color: #141b26; }
.btn-light:hover { background: #ffffff; }
.btn-ghost-light { border-color: rgb(236 232 224 / 0.45); color: var(--color-on-ink); background: transparent; }
.btn-ghost-light:hover { border-color: var(--color-on-ink); }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--color-divider); }
.header-inner { display: flex; align-items: center; gap: var(--space-6); min-height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--color-text); }
.logo { display: block; height: 44px; width: auto; flex: none; }
.logo-on-dark { display: none; }
[data-theme='dark'] .logo-on-light { display: none; }
[data-theme='dark'] .logo-on-dark { display: block; }
.footer-brand .logo { height: 56px; }
@media (max-width: 899px) { .logo { height: 38px; } }
@media (max-width: 359px) { .logo { height: 32px; } }

.primary-nav { margin-left: auto; display: flex; align-items: center; gap: var(--space-8); }
.nav-list { list-style: none; display: flex; gap: var(--space-6); }
.nav-list a {
  font-size: var(--text-sm); text-decoration: none; color: var(--color-text-muted);
  padding-block: var(--space-2); border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.nav-list a:hover { color: var(--color-text); }
.nav-list a[aria-current='page'] { color: var(--color-text); border-bottom-color: var(--color-accent); }
.header-actions { display: flex; align-items: center; gap: var(--space-1); }
.icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px;
  border: 0; background: transparent; color: var(--color-text); cursor: pointer; border-radius: var(--radius-sm);
}
.icon-btn:hover { background: var(--color-surface-alt); }
.icon-moon { display: none; }
[data-theme='dark'] .icon-sun { display: none; }
[data-theme='dark'] .icon-moon { display: block; }
.nav-toggle { display: none; }

@media (max-width: 899px) {
  .header-inner { gap: var(--space-3); }
  .header-actions { margin-left: auto; }
  .nav-toggle { display: inline-grid; }
  .primary-nav {
    position: fixed; inset: var(--header-h) 0 auto 0; margin: 0;
    flex-direction: column; align-items: stretch; gap: var(--space-6);
    padding: var(--space-6) var(--gutter) var(--space-8);
    background: var(--color-bg); border-bottom: 1px solid var(--color-divider);
    box-shadow: 0 12px 24px rgb(0 0 0 / 0.08);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
  }
  .primary-nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav-list { flex-direction: column; gap: 0; }
  .nav-list a { display: block; padding-block: var(--space-4); border-bottom: 1px solid var(--color-divider); font-size: var(--text-base); }
  .nav-list a[aria-current='page'] { border-bottom-color: var(--color-divider); color: var(--color-text); box-shadow: inset 2px 0 0 var(--color-accent); padding-left: var(--space-4); }
  .nav-cta { width: 100%; min-height: 48px; }
}

/* Cards */
.card-grid { display: grid; gap: 1px; background: var(--color-border); border: 1px solid var(--color-border); }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .card-grid { grid-template-columns: repeat(4, 1fr); } }
.service-card {
  display: flex; flex-direction: column; gap: var(--space-4);
  padding: var(--space-8) var(--space-6); background: var(--color-surface);
  text-decoration: none; color: var(--color-text); min-height: 260px;
  transition: background-color 0.25s var(--ease);
}
.service-card h3, .service-card h4 { font-family: var(--font-body); font-size: var(--text-lg); font-weight: 700; line-height: 1.25; }
.service-card p { color: var(--color-text-muted); font-size: var(--text-sm); }
.card-link { margin-top: auto; font-size: var(--text-sm); font-weight: 500; color: var(--color-primary); }
.service-card:hover { background: var(--color-bg); }
@media (max-width: 639px) { .service-card { min-height: 0; padding: var(--space-6) var(--space-5); } .card-link { margin-top: var(--space-2); } }
.service-card:hover .card-link span { display: inline-block; transform: translateX(3px); transition: transform 0.2s var(--ease); }

/* Service strands (home) */
.strand + .strand { margin-top: clamp(var(--space-12), 5vw, var(--space-16)); }
.strand-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--space-3) var(--space-6); margin-bottom: var(--space-6); }
.strand-title { font-family: var(--font-display); font-size: var(--text-lg); }
.strand-link { font-size: var(--text-sm); font-weight: 500; color: var(--color-primary); text-decoration: none; }
.strand-link:hover { text-decoration: underline; }
@media (min-width: 1080px) { .card-grid-3 { grid-template-columns: repeat(3, 1fr); } }

/* Credentials band */
.credentials { border-bottom: 1px solid var(--color-divider); background: var(--color-surface); }
.credential-list { list-style: none; display: grid; grid-template-columns: 1fr; column-gap: var(--space-8); }
.credential-list li { display: grid; align-content: start; gap: var(--space-1); padding: var(--space-5) 0; border-top: 1px solid var(--color-divider); font-weight: 500; }
.credential-list li:first-child { border-top: 0; }
.credential-label { font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent); }
@media (min-width: 640px) {
  .credential-list { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); clip-path: inset(1px 0 0 0); }
  .credential-list li, .credential-list li:first-child { padding: var(--space-6) 0; border-top: 1px solid var(--color-divider); }
}

/* Process steps */
.process-grid { list-style: none; display: grid; gap: var(--space-8); counter-reset: none; }
@media (min-width: 640px) { .process-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .process-grid { grid-template-columns: repeat(4, 1fr); gap: var(--space-10); } }
.process-step { padding-top: var(--space-6); border-top: 1px solid var(--color-text); }
.process-step h3 { font-size: var(--text-lg); font-weight: 700; margin-top: var(--space-3); }
.process-step p { margin-top: var(--space-2); color: var(--color-text-muted); }

/* Numbered list */
.split-note { margin-top: var(--space-5); color: var(--color-text-muted); max-width: 44ch; }
.numbered-list { list-style: none; display: grid; }
.numbered-list li { display: grid; grid-template-columns: 3rem 1fr; gap: var(--space-4); padding-block: var(--space-6); border-top: 1px solid var(--color-divider); }
.numbered-list li:last-child { border-bottom: 1px solid var(--color-divider); }
.numbered-list .num { font-family: var(--font-display); color: var(--color-accent); font-size: var(--text-base); padding-top: 2px; }
.numbered-list h3 { font-size: var(--text-lg); font-weight: 700; margin-bottom: var(--space-1); }
.numbered-list p { color: var(--color-text-muted); }

/* Feature (image + copy) */
.feature { display: grid; gap: var(--space-10); align-items: center; }
@media (min-width: 900px) { .feature { grid-template-columns: 6fr 5fr; gap: var(--space-20); } }
.feature-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.feature-copy p { color: var(--color-text-muted); margin-top: var(--space-5); max-width: 52ch; }
.pull-quote {
  margin: var(--space-8) 0 0; padding-left: var(--space-6); border-left: 2px solid var(--color-accent);
  font-family: var(--font-display); font-size: var(--text-lg); line-height: 1.4; color: var(--color-text);
}

/* Callout */
.callout { padding: var(--space-8); background: var(--color-surface); border: 1px solid var(--color-border); border-top: 2px solid var(--color-accent); }
.callout h2 { font-family: var(--font-body); font-size: var(--text-lg); font-weight: 700; margin-bottom: var(--space-3); }
.callout p { color: var(--color-text-muted); }
.callout-compact { padding: var(--space-6); }

/* CTA band */
.cta-band { background: var(--color-ink); color: var(--color-on-ink); padding-block: clamp(var(--space-16), 7vw, var(--space-24)); }
.cta-inner { display: grid; gap: var(--space-8); align-items: end; }
@media (min-width: 900px) { .cta-inner { grid-template-columns: 1fr auto; gap: var(--space-16); } }
.cta-title { font-family: var(--font-display); font-size: var(--text-xl); max-width: 22ch; }
.cta-text { color: var(--color-on-ink-muted); margin-top: var(--space-4); max-width: 52ch; }

/* Page hero (interior pages) */
.page-hero { padding-block: clamp(var(--space-12), 6vw, var(--space-20)); border-bottom: 1px solid var(--color-divider); }
.page-hero-grid { display: grid; gap: var(--space-10); align-items: center; }
@media (min-width: 900px) { .page-hero-grid { grid-template-columns: 7fr 5fr; gap: var(--space-16); } }
.page-hero-media { margin: 0; }
.page-hero-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
@media (max-width: 899px) { .page-hero-media img { aspect-ratio: 16 / 9; } }

/* Footer */
.site-footer { background: var(--color-surface); border-top: 1px solid var(--color-divider); padding-top: var(--space-16); }
.footer-grid { display: grid; gap: var(--space-10); padding-bottom: var(--space-12); }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 2fr 1fr 1.4fr; } }
.footer-tag { margin-top: var(--space-4); color: var(--color-text-muted); font-size: var(--text-sm); max-width: 34ch; }
.footer-heading { font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-text-muted); margin-bottom: var(--space-4); }
.footer-nav ul, .footer-contact ul { list-style: none; display: grid; gap: var(--space-2); }
.footer-nav a, .footer-contact a { font-size: var(--text-sm); text-decoration: none; overflow-wrap: anywhere; }
.footer-nav a:hover, .footer-contact a:hover { text-decoration: underline; }
.footer-legal { display: grid; gap: var(--space-2); padding-block: var(--space-6); border-top: 1px solid var(--color-divider); font-size: var(--text-xs); color: var(--color-text-muted); }
@media (min-width: 760px) { .footer-legal { grid-template-columns: 1fr auto; gap: var(--space-8); } }

/* ---------- 5. Pages ---------- */
/* Home hero */
.home-hero { position: relative; isolation: isolate; color: var(--color-on-ink); background: var(--color-ink); min-height: min(86vh, 820px); display: flex; align-items: flex-end; }
.home-hero-media { position: absolute; inset: 0; z-index: -1; }
.home-hero-media img { width: 100%; height: 100%; object-fit: cover; }
.home-hero-media::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgb(11 15 21 / 0.35) 0%, rgb(11 15 21 / 0.55) 45%, rgb(11 15 21 / 0.9) 100%); }
.home-hero-inner { padding-block: clamp(var(--space-16), 10vw, var(--space-24)); }
.hero-title { font-family: var(--font-display); font-size: var(--text-3xl); max-width: 18ch; line-height: 1.05; }
.hero-lede { margin-top: var(--space-6); max-width: 56ch; color: var(--color-on-ink-muted); }

/* Services */
.service-layout { display: grid; gap: var(--space-10); }
@media (min-width: 960px) { .service-layout { grid-template-columns: 240px 1fr; gap: var(--space-20); } }
.service-index { align-self: start; }
@media (min-width: 960px) { .service-index { position: sticky; top: calc(var(--header-h) + var(--space-8)); } }
.service-index ul { list-style: none; display: grid; gap: var(--space-1); border-left: 1px solid var(--color-divider); }
.service-index a { display: block; padding: var(--space-2) var(--space-4); font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none; margin-left: -1px; border-left: 1px solid transparent; }
.service-index a:hover, .service-index a.is-active { color: var(--color-text); border-left-color: var(--color-accent); }
@media (max-width: 959px) {
  .service-index ul { display: flex; flex-wrap: wrap; gap: var(--space-2); border: 0; }
  .service-index a { border: 1px solid var(--color-border); border-radius: 999px; padding: var(--space-2) var(--space-4); margin: 0; }
}
.service-list { display: grid; gap: var(--space-12); }
.service-block { padding-bottom: var(--space-12); border-bottom: 1px solid var(--color-divider); }
.service-block h2 { font-family: var(--font-display); font-size: var(--text-xl); margin-top: var(--space-2); }
.service-block p { color: var(--color-text-muted); margin-top: var(--space-4); max-width: 62ch; }
.block-subhead { font-size: var(--text-lg); font-weight: 700; margin-top: var(--space-8); }
.tick-list { list-style: none; display: grid; gap: var(--space-2); margin-top: var(--space-6); }
.tick-list li { position: relative; padding-left: var(--space-8); font-size: var(--text-sm); }
.tick-list li::before { content: ''; position: absolute; left: 0; top: 0.7em; width: var(--space-4); height: 1px; background: var(--color-accent); }

/* About */
.value-grid { display: grid; gap: var(--space-8); }
@media (min-width: 760px) { .value-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-10); } }
.value { padding-top: var(--space-6); border-top: 1px solid var(--color-text); }
.value h3 { font-size: var(--text-lg); font-weight: 700; margin-top: var(--space-3); }
.value p { margin-top: var(--space-2); color: var(--color-text-muted); }

/* Contact */
.contact-layout { display: grid; gap: var(--space-12); }
@media (min-width: 960px) { .contact-layout { grid-template-columns: 5fr 7fr; gap: var(--space-20); align-items: start; } }
.contact-details { display: grid; gap: var(--space-8); }
.contact-link { font-family: var(--font-display); font-size: var(--text-lg); text-decoration: none; overflow-wrap: anywhere; border-bottom: 1px solid var(--color-border); }
.contact-link:hover { border-bottom-color: var(--color-text); }
.contact-form { display: grid; gap: var(--space-5); padding: clamp(var(--space-6), 4vw, var(--space-10)); background: var(--color-surface); border: 1px solid var(--color-border); }
.form-title { font-family: var(--font-display); font-size: var(--text-xl); }
.form-note { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: calc(var(--space-3) * -1); }
.field-row { display: grid; gap: var(--space-5); }
@media (min-width: 640px) { .field-row { grid-template-columns: 1fr 1fr; } }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--text-sm); font-weight: 500; }
.field input, .field select, .field textarea {
  width: 100%; min-height: 48px; padding: var(--space-3) var(--space-4);
  font: inherit; font-size: var(--text-base); color: var(--color-text);
  background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-sm);
}
.field textarea { resize: vertical; min-height: 140px; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--color-focus); outline-offset: 0; border-color: transparent; }
.field [aria-invalid='true'] { border-color: #b3261e; }
.field-check { grid-template-columns: auto 1fr; align-items: start; gap: var(--space-3); }
.field-check input { width: 20px; height: 20px; min-height: 0; margin-top: 3px; accent-color: var(--color-primary); }
.field-check label { font-weight: 400; color: var(--color-text-muted); }
.form-status { font-size: var(--text-sm); min-height: 1.5em; }
.form-status.is-error { color: #b3261e; }
[data-theme='dark'] .form-status.is-error, [data-theme='dark'] .field [aria-invalid='true'] { color: #f2b8b5; border-color: #f2b8b5; }
.contact-form .btn { justify-self: start; }

/* 404 */
.notfound { min-height: 60vh; display: flex; align-items: center; }

/* Home strand cards: short brass rule instead of numbers */
.strand .service-card::before { content: ""; display: block; width: 32px; height: 2px; background: var(--color-accent); margin-bottom: var(--space-2); }

/* About: founder portrait keeps a portrait frame */
.page-hero-media img[src$="about-portrait.jpg"] { aspect-ratio: 4 / 5; object-position: 50% 30%; }
@media (max-width: 899px) { .page-hero-media img[src$="about-portrait.jpg"] { aspect-ratio: 4 / 5; max-width: 420px; } }

.section-bio { border-top: 1px solid var(--color-border); }