/* ============================================================
   Danielson Systems LLC — Stylesheet
   Tokens, base, layout, components, page-specific, media queries
   ============================================================ */

:root {
  /* Color */
  --color-text:         #111418;
  --color-text-muted:   #5a6470;
  --color-text-subtle:  #8a8f97;
  --color-bg:           #fdfdfc;
  --color-bg-alt:       #f5f3ee;
  --color-rule:         #e4e2dd;
  --color-accent:       #2a5560;
  --color-accent-hover: #1a3b44;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --fs-base:  1rem;        /* 16px on mobile */
  --fs-lg:    1.0625rem;   /* 17px desktop body */
  --fs-sm:    0.9375rem;   /* 15px */
  --fs-xs:    0.8125rem;   /* 13px */
  --fs-h1:    clamp(2rem, 1rem + 3vw, 2.75rem);
  --fs-h2:    clamp(1.5rem, 1rem + 1.5vw, 1.875rem);
  --fs-h3:    1.1875rem;   /* 19px */

  --lh-tight: 1.25;
  --lh-snug:  1.4;
  --lh-body:  1.6;

  /* Spacing — 8px scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;

  /* Layout */
  --content-max:  720px;
  --site-max:     1080px;
  --gutter:       1.25rem;
}

/* ----- Reset / base ----- */

*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
  line-height: var(--lh-tight);
  color: var(--color-text);
}

h1 { font-size: var(--fs-h1); letter-spacing: -0.01em; }
h2 { font-size: var(--fs-h2); letter-spacing: -0.005em; }
h3 { font-size: var(--fs-h3); }

p { margin: 0; }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 120ms ease;
}
a:hover, a:focus { color: var(--color-accent-hover); }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

img, svg { max-width: 100%; height: auto; display: block; }

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* ----- Layout primitives ----- */

.container {
  width: 100%;
  max-width: var(--site-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: var(--content-max);
}

.stack > * + * { margin-top: var(--space-3); }
.stack-sm > * + * { margin-top: var(--space-2); }
.stack-lg > * + * { margin-top: var(--space-4); }

/* ----- Header / nav ----- */

.site-header {
  border-bottom: 1px solid var(--color-rule);
  background: var(--color-bg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
  flex-wrap: wrap;
}

.wordmark {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--color-text);
  text-decoration: none;
}
.wordmark:hover { color: var(--color-text); }

.nav {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--fs-sm);
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
}
.nav a:hover {
  color: var(--color-text);
}
.nav a[aria-current="page"] {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

/* ----- Footer ----- */

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--color-rule);
  background: var(--color-bg);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  align-items: baseline;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.site-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.site-footer a:hover { color: var(--color-accent); }

.site-footer__contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
}

/* ----- Main / page sections ----- */

main { flex: 1 0 auto; }

.section {
  padding-block: var(--space-6);
}
.section + .section {
  border-top: 1px solid var(--color-rule);
}

.section__eyebrow {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

/* ----- Hero (home) ----- */

.hero {
  padding-block: var(--space-7) var(--space-6);
}

.hero__name {
  font-size: var(--fs-h1);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.hero__tagline {
  font-size: 1.0625rem;
  color: var(--color-accent);
  margin-top: var(--space-1);
  font-weight: 500;
}

.hero__intro {
  margin-top: var(--space-3);
  font-size: var(--fs-lg);
  color: var(--color-text);
  max-width: var(--content-max);
}

/* ----- Services preview grid (home) ----- */

.services-preview {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3) var(--space-4);
}

.services-preview__item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
}

.services-preview__item p {
  margin-top: 0.25rem;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

/* ----- Services full list ----- */

.service-list > li {
  padding-block: var(--space-4);
}
.service-list > li + li {
  border-top: 1px solid var(--color-rule);
}

.service-list h3 {
  font-size: 1.25rem;
}

.service-list p {
  margin-top: var(--space-1);
  max-width: var(--content-max);
}

.service-list ul {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}
.service-list ul li {
  padding-left: 1.1em;
  position: relative;
  margin-top: 0.25rem;
}
.service-list ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 4px;
  height: 1px;
  background: var(--color-text-subtle);
}

/* ----- About page ----- */

.about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
}

.about-intro__text > * + * { margin-top: var(--space-3); }

.about-intro__portrait {
  width: 100%;
  max-width: 320px;
  margin-inline: auto;
  border: 1px solid var(--color-rule);
  background: var(--color-bg-alt);
}

/* Background list (experience) */

.background-list > li {
  padding-block: var(--space-3);
}
.background-list > li + li {
  border-top: 1px solid var(--color-rule);
}

.background-list__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
}

.background-list__role {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

.background-list__employer {
  color: var(--color-text-muted);
  font-weight: 500;
}

.background-list__dates {
  color: var(--color-text-subtle);
  font-size: var(--fs-sm);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.background-list__desc {
  margin-top: var(--space-1);
  color: var(--color-text);
  max-width: var(--content-max);
}

/* Education */

.education__item {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
}

.education__institution {
  font-weight: 600;
}

.education__detail {
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.education__dates {
  color: var(--color-text-subtle);
  font-size: var(--fs-sm);
  font-variant-numeric: tabular-nums;
}

/* ----- Contact page ----- */

.contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  max-width: var(--content-max);
}

.contact-list__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
  padding-block: var(--space-2);
  border-top: 1px solid var(--color-rule);
}
.contact-list__item:last-child {
  border-bottom: 1px solid var(--color-rule);
}

.contact-list__label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-subtle);
  font-weight: 500;
}

.contact-list__value {
  font-size: 1.0625rem;
}

/* ----- Inline link styles for prose nav cues ----- */

.more-link {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.more-link::after {
  content: " \2192"; /* right arrow */
}

/* ============================================================
   Media queries — mobile-first, layer up at breakpoints
   ============================================================ */

@media (min-width: 640px) {
  html { font-size: var(--fs-lg); }

  .services-preview {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4) var(--space-5);
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  .contact-list__item {
    grid-template-columns: 160px 1fr;
    align-items: baseline;
    gap: var(--space-3);
  }

  .contact-list__label {
    padding-top: 0.25rem;
  }
}

@media (min-width: 880px) {
  :root { --gutter: 2rem; }

  .about-intro {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: var(--space-5);
  }

  .about-intro__portrait {
    max-width: none;
    margin-inline: 0;
  }
}