/* ============================================================
   Altenture | global stylesheet
   Brand palette + reset + layout primitives. Component styles
   are added here in section order. Mobile-first. One breakpoint:
   @media (min-width: 769px).

   CSS keywords use the spec spelling (color, background-color).
   Custom properties use UK spelling (--colour-bg).
   ============================================================ */

/* -------- 1. Custom properties -------- */
:root {
  /* Brand colours (from brand_guidelines.pdf) */
  --colour-bg: #f9f9f9;
  --colour-surface: #ffffff;
  --colour-text: #2c2c2c;
  --colour-text-mute: #6b6b6b;
  --colour-border: #e5e5e5;
  --colour-accent: #ed1c24;
  --colour-accent-hover: #d11820;
  --colour-accent-active: #b81519;
  --colour-accent-fg: #ffffff;

  /* Soft palette (used sparingly) */
  --colour-blush: #ffb3b8;
  --colour-rose-100: #ffd6d9;
  --colour-rose-50: #fff0f1;

  /* Optional accents (icons, small details only) */
  --colour-sage: #8fbc8f;
  --colour-blue: #9bb8d3;
  --colour-peach: #f4c095;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Type scale (mapped to brand) */
  --size-display: clamp(36px, 5vw, 60px);
  --size-h1: clamp(28px, 3vw, 36px);
  --size-h2: clamp(22px, 2vw, 24px);
  --size-h3: 20px;
  --size-body-lg: 18px;
  --size-body: 16px;
  --size-small: 14px;

  /* Spacing scale (8pt base) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  /* Layout */
  --container: 1100px;
  --reading: 720px;
  --radius: 8px;
  --nav-height: 64px;
}

/* -------- 2. Modern reset (Andy Bell-style, trimmed) -------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--size-body);
  line-height: 1.55;
  color: var(--colour-text);
  background: var(--colour-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
svg,
video {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* -------- 3. Base typography -------- */
h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--size-h1);
}

h2 {
  font-size: var(--size-h2);
  font-weight: 600;
}

h3 {
  font-size: var(--size-h3);
  font-weight: 500;
}

h4 {
  font-size: var(--size-body);
  font-weight: 500;
}

/* -------- 4. Layout primitives -------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.container--reading {
  max-width: var(--reading);
}

.section {
  padding-block: var(--space-7);
  border-bottom: 1px solid var(--colour-border);
}

.grid-2 {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

.grid-3 {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr;
}

@media (min-width: 769px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
  .grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* -------- 5. Buttons -------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 17px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.btn--primary {
  background: var(--colour-accent);
  color: var(--colour-accent-fg);
  padding: 16px 28px;
}

.btn--primary:hover {
  background: var(--colour-accent-hover);
}

.btn--primary:active {
  background: var(--colour-accent-active);
}

.btn--primary:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
}

.btn--large {
  padding: 20px 36px;
  font-size: 18px;
}

/* -------- 6. Brand wordmark + logo -------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--colour-text);
}

.brand__mark {
  width: 20px;
  height: 18px;
}

.brand__wordmark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 16px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* -------- 7. Utility -------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-mute {
  color: var(--colour-text-mute);
}

/* -------- 8. Reduced motion -------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   Sections below this line are added by the build prompts.
   Build order: nav, hero, what-we-do, about, how-we-work,
   principles, promise, faq, contact, footer.
   ============================================================ */

/* -------- Nav -------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--colour-bg);
  border-bottom: 1px solid var(--colour-border);
  display: flex;
  align-items: center;
  transition: box-shadow 150ms ease;
}

.nav--shrunk {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.nav__inner {
  display: flex;
  align-items: center;
  width: 100%;
}

.nav__links {
  display: none;
}

.nav__cta {
  display: none;
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  margin-left: auto;
  background: none;
  border: none;
  padding: var(--space-1);
  cursor: pointer;
  border-radius: var(--radius);
  color: var(--colour-text);
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.nav__toggle:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
}

/* Mobile overlay */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--colour-bg);
  flex-direction: column;
  padding-block: var(--space-3) var(--space-6);
}

.nav__overlay.is-open {
  display: flex;
}

.nav__overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__close {
  background: none;
  border: none;
  padding: var(--space-1);
  cursor: pointer;
  color: var(--colour-text);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav__close:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
}

.nav__overlay-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-block: var(--space-6);
  flex: 1;
}

.nav__overlay-links a {
  font-size: clamp(24px, 6vw, 32px);
  font-weight: 600;
  text-decoration: none;
  color: var(--colour-text);
  letter-spacing: -0.01em;
}

.nav__overlay-links a:hover {
  color: var(--colour-accent);
}

.nav__overlay-links a:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

.nav__overlay-cta {
  width: fit-content;
}

@media (min-width: 769px) {
  .nav__toggle {
    display: none;
  }

  .nav__overlay {
    display: none !important;
  }

  .nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-left: auto;
  }

  .nav__links a {
    font-size: var(--size-small);
    font-weight: 500;
    text-decoration: none;
    color: var(--colour-text);
    white-space: nowrap;
  }

  .nav__links a:hover {
    color: var(--colour-accent);
  }

  .nav__links a:focus-visible {
    outline: 2px solid var(--colour-accent);
    outline-offset: 2px;
    border-radius: 2px;
  }

  .nav__cta {
    display: inline-flex;
    margin-left: var(--space-3);
    padding: 10px 20px;
    font-size: 15px;
  }
}

/* -------- Hero -------- */
.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  padding: 160px var(--space-3) 80px;
  background: var(--colour-bg);
  border-bottom: 1px solid var(--colour-border);
}

.hero__inner {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.hero__headline {
  font-size: var(--size-display);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
  color: var(--colour-text);
}

.hero__subhead {
  font-size: clamp(16px, 1.4vw, 18px);
  font-weight: 400;
  line-height: 1.55;
  max-width: 640px;
  margin: 0 0 var(--space-5);
  color: var(--colour-text);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.hero__availability {
  font-size: var(--size-small);
  color: var(--colour-text-mute);
  margin: 0;
}

@media (max-width: 768px) {
  .hero {
    padding: 80px var(--space-2) var(--space-6);
    align-items: flex-start;
  }

  .hero__headline {
    margin-bottom: var(--space-3);
  }

  .hero__cta {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__headline {
    animation: none;
  }
}

/* -------- Shared section typography (used from §what onwards) -------- */
.section__title {
  margin-bottom: var(--space-2);
}

.section__lead {
  font-size: var(--size-body-lg);
  color: var(--colour-text-mute);
  line-height: 1.6;
  max-width: 640px;
  margin-bottom: var(--space-5);
}

/* -------- What we do -------- */
.offering {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.offering--primary {
  background: var(--colour-rose-50);
  border-color: transparent;
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}

.offering__tag {
  display: inline-block;
  background: var(--colour-rose-100);
  color: var(--colour-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: var(--space-3);
}

.offering__title {
  margin-bottom: var(--space-2);
}

.offering__body {
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.offering__meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: var(--space-3);
  row-gap: var(--space-2);
  align-items: baseline;
}

.offering__meta dt {
  font-size: var(--size-small);
  color: var(--colour-text-mute);
}

.offering__meta dd {
  margin: 0;
}

@media (max-width: 768px) {
  .offering__meta {
    grid-template-columns: 1fr;
    row-gap: var(--space-1);
  }

  .offering__meta dd + dt {
    margin-top: var(--space-2);
  }
}

/* -------- About -------- */
.section--about p + p {
  margin-top: var(--space-3);
}

/* -------- How we work -------- */
.steps {
  counter-reset: steps;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.steps li {
  counter-increment: steps;
  position: relative;
  padding-left: 2.5rem;
}

.steps li::before {
  content: counter(steps);
  position: absolute;
  left: 0;
  top: 0;
  font-size: 24px;
  font-weight: 600;
  color: var(--colour-accent);
  line-height: 1;
}

.steps h3 {
  font-size: var(--size-body-lg);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.steps p {
  font-size: var(--size-body);
  color: var(--colour-text-mute);
  line-height: 1.6;
}

.section__subtitle {
  font-size: var(--size-h3);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.model {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.model h4 {
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.model p {
  color: var(--colour-text-mute);
  line-height: 1.5;
}

.section__note {
  font-size: 15px;
  color: var(--colour-text-mute);
  margin-top: var(--space-4);
}

/* -------- Principles -------- */
.principles {
  list-style: none;
  border-top: 1px solid var(--colour-border);
}

.principles li {
  padding-block: var(--space-2);
  font-size: var(--size-body-lg);
  line-height: 1.55;
  border-bottom: 1px solid var(--colour-border);
}

/* -------- Our promise -------- */
.promise-col__title {
  font-size: var(--size-body-lg);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.promise-col--do {
  padding-left: var(--space-3);
  border-left: 2px solid var(--colour-accent);
}

.promise-list {
  list-style: decimal;
  padding-left: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.promise-list li {
  line-height: 1.6;
}

/* -------- FAQ -------- */
.faq__item {
  border-bottom: 1px solid var(--colour-border);
}

.faq__item[open] {
  box-shadow: inset 2px 0 0 var(--colour-accent);
}

.faq__item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-2);
  font-weight: 500;
  font-size: 17px;
  color: var(--colour-text);
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--colour-text-mute);
  flex-shrink: 0;
  line-height: 1;
}

.faq__item[open] summary::after {
  content: '−';
}

.faq__item summary:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.faq__item p {
  padding-top: var(--space-2);
  padding-bottom: var(--space-3);
  color: var(--colour-text-mute);
  line-height: 1.6;
}

/* -------- Contact / CTA -------- */
.section--cta {
  background: var(--colour-rose-50);
  text-align: center;
  border-bottom: none;
}

.cta__headline {
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-5);
}

.section--cta .btn {
  margin-bottom: var(--space-3);
}

.cta__email {
  font-size: var(--size-body);
  color: var(--colour-text-mute);
  margin-bottom: var(--space-2);
}

.cta__hint {
  font-size: var(--size-small);
  color: var(--colour-text-mute);
}

/* -------- Footer -------- */
.footer {
  background: var(--colour-surface);
  border-top: 1px solid var(--colour-border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  padding-block: var(--space-6);
}

@media (min-width: 769px) {
  .footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__tagline {
  font-size: var(--size-small);
  color: var(--colour-text-mute);
  margin-top: var(--space-2);
  line-height: 1.5;
}

.footer__col h4 {
  font-size: var(--size-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--colour-text-mute);
  margin-bottom: var(--space-2);
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer__col ul a {
  font-size: var(--size-small);
  color: var(--colour-text-mute);
  text-decoration: none;
}

.footer__col ul a:hover {
  color: var(--colour-text);
  text-decoration: underline;
  text-decoration-color: var(--colour-accent);
}

.footer__col ul a:focus-visible {
  outline: 2px solid var(--colour-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.footer__bottom {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-block: var(--space-3);
  border-top: 1px solid var(--colour-border);
  font-size: 13px;
  color: var(--colour-text-mute);
}

.footer__bottom a {
  color: var(--colour-text-mute);
  text-decoration: none;
}

.footer__bottom a:hover {
  color: var(--colour-text);
  text-decoration: underline;
  text-decoration-color: var(--colour-accent);
}