/* NSysNets website styles.
   To change the brand colors, edit the values just below. */

:root {
  color-scheme: light;

  /* Brand colors. See brand/README.md. Never use amber for text on white. */
  --ink: #0b1f33;
  --amber: #ffb627;
  --paper: #ffffff;

  /* Lighter and darker shades of the brand colors. */
  --ink-soft: #465a6e;   /* quieter text */
  --ink-hover: #1b3a57;  /* buttons when hovered */
  --amber-hover: #ffc95c;
  --line: #dde3ea;       /* thin lines */
  --tint: #f3f5f8;       /* pale panels */

  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section: clamp(3rem, 8vw, 5.5rem);
  --radius: 12px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

main {
  flex: 1;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.375rem, 7vw, 3.75rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.625rem, 4vw, 2.25rem);
}

h3 {
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}

p,
ul,
ol,
dl,
dd {
  margin: 0;
}

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

a {
  color: var(--ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

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

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Layout */

.wrap {
  width: 100%;
  max-width: 70rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section);
}

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

.intro {
  max-width: 38rem;
  margin-top: 0.75rem;
  color: var(--ink-soft);
}

.lede {
  max-width: 36rem;
  margin-top: 1.25rem;
  color: var(--ink-soft);
  font-size: clamp(1.125rem, 2.4vw, 1.3125rem);
  line-height: 1.5;
}

.after-list {
  margin-top: 2rem;
}

/* Skip link for keyboard users */

.skip {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 10;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-200%);
}

.skip:focus {
  color: var(--paper);
  transform: none;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--line);
}

.site-header__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 2rem;
  padding-block: 0.75rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.logo img {
  display: block;
  width: auto;
  height: 34px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
  margin-inline: -0.25rem;
}

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: 0.25rem;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 3px;
  text-underline-offset: 0.4em;
}

.nav a[aria-current="page"] {
  font-weight: 700;
}

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.6rem 1.4rem;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
}

.button:hover {
  border-color: var(--ink-hover);
  background: var(--ink-hover);
  color: var(--paper);
}

.button--quiet {
  border-color: var(--line);
  background: transparent;
  color: var(--ink);
}

.button--quiet:hover {
  border-color: var(--ink);
  background: transparent;
  color: var(--ink);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* Home hero */

.hero {
  padding-block: clamp(3rem, 9vw, 6rem);
}

.hero__row {
  display: grid;
  align-items: center;
  gap: 3rem;
}

.hero__art {
  display: none;
  width: 100%;
  max-width: 17rem;
  height: auto;
  justify-self: end;
}

/* Page heading on inner pages */

.page-head {
  padding-block: clamp(2.5rem, 7vw, 4.5rem);
  background: var(--tint);
}

/* Two equal columns */

.columns {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.columns--flush {
  align-items: center;
  gap: 2rem 3rem;
  margin-top: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  padding: clamp(1.5rem, 4vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.panel h2 {
  font-size: 1.375rem;
}

.panel--tint {
  border-color: transparent;
  background: var(--tint);
}

.panel p {
  margin-top: 0.5rem;
  color: var(--ink-soft);
}

.panel__link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 1rem;
  font-weight: 600;
}

/* Tag list on the home page */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.tags li {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.9688rem;
}

/* "What we build" list */

.build-list {
  display: grid;
  gap: 0 3rem;
  margin-top: 2rem;
}

.build-list div {
  padding-block: 1.1rem;
  border-top: 1px solid var(--line);
}

.build-list dt {
  font-weight: 700;
}

.build-list dd {
  color: var(--ink-soft);
}

/* Simple bullet lists */

.ticks {
  margin-top: 0.75rem;
}

.ticks li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--ink-soft);
}

.ticks li + li {
  margin-top: 0.4rem;
}

.ticks li::before {
  content: "";
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--amber);
}

/* Project steps */

.steps {
  display: grid;
  gap: 1.75rem;
  margin-top: 2rem;
  counter-reset: step;
}

.steps li {
  padding-top: 0.9rem;
  border-top: 2px solid var(--ink);
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.6rem;
  border-radius: 4px;
  background: var(--amber);
  font-weight: 700;
}

.steps p {
  margin-top: 0.35rem;
  color: var(--ink-soft);
}

/* Closing call to action */

.cta {
  padding-block: var(--section);
  background: var(--ink);
  color: var(--paper);
}

.cta p {
  max-width: 36rem;
  margin-top: 0.75rem;
  color: #d3dae6;
}

.cta .button {
  margin-top: 1.75rem;
  border-color: var(--amber);
  background: var(--amber);
  color: var(--ink);
}

.cta .button:hover {
  border-color: var(--amber-hover);
  background: var(--amber-hover);
  color: var(--ink);
}

.cta :focus-visible {
  outline-color: var(--amber);
}

/* Ready-made products. Used once products are listed. */

.products {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

/* Contact page */

.email-address {
  margin-top: 1.25rem;
  font-size: clamp(1.25rem, 5vw, 1.625rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.panel .email-address {
  color: var(--ink);
}

.panel .small {
  margin-top: 1rem;
  font-size: 0.9375rem;
}

.details {
  margin-top: 1.25rem;
}

.details div {
  display: grid;
  gap: 0 1.5rem;
  padding-block: 0.75rem;
  border-top: 1px solid var(--line);
}

.details dt {
  font-weight: 600;
}

.details dd {
  color: var(--ink-soft);
}

/* Long text, such as the privacy page */

.prose {
  max-width: 40rem;
}

.prose h2 {
  margin-top: 2.5rem;
  font-size: 1.375rem;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  margin-top: 0.75rem;
  color: var(--ink-soft);
}

/* A fact still needed before launch. website/check-site.py lists these. */

.placeholder {
  padding: 0.1em 0.4em;
  border: 1px dashed #a16207;
  border-radius: 4px;
  background: #fef3c7;
  color: var(--ink);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.site-footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  padding-block: 1.75rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  margin-inline: -0.25rem;
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: 0.25rem;
  color: var(--ink-soft);
}

.site-footer__links a:hover {
  color: var(--ink);
}

/* Wider screens */

@media (min-width: 40rem) {
  .columns,
  .build-list,
  .products {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .details div {
    grid-template-columns: 12rem 1fr;
  }
}

@media (min-width: 60rem) {
  .hero__row {
    grid-template-columns: 1.5fr 1fr;
  }

  .hero__art {
    display: block;
  }

  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media print {
  .site-header nav,
  .skip,
  .cta {
    display: none;
  }
}