/* ==========================================================================
   Roman Krüger — Software Engineering
   Minimal, technical, light. Self-hosted fonts (no external requests).
   ========================================================================== */

/* --- Fonts ---------------------------------------------------------------- */
@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter Tight";
  src: url("../fonts/inter-tight-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter Tight";
  src: url("../fonts/inter-tight-700.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* --- Tokens --------------------------------------------------------------- */
:root {
  --font-body: "Inter", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-display:
    "Inter Tight", "Inter", -apple-system, Helvetica, Arial, sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
  --text-base: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.3125rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1vw, 2.125rem);
  --text-2xl: clamp(2.125rem, 1.5rem + 2.4vw, 3.5rem);

  --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;

  --color-bg: #fcfcfb;
  --color-surface: #ffffff;
  --color-offset: #f4f4f1;
  --color-border: #e3e3de;
  --color-divider: #ecece8;

  --color-text: #16181a;
  --color-muted: #5e6367;
  --color-faint: #92979b;

  --color-accent: #14555f;
  --color-accent-hover: #0d3e46;
  --color-accent-tint: #e8f0f1;

  --radius-sm: 2px;
  --radius-md: 4px;

  --content: 1120px;
  --content-narrow: 720px;

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Base ----------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.018em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

a {
  color: inherit;
  transition:
    color var(--transition),
    background var(--transition),
    border-color var(--transition);
}

ul {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 100;
  background: var(--color-text);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
}
.skip-link:focus {
  top: var(--space-4);
}

/* --- Layout helpers -------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--content);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (min-width: 900px) {
  .wrap {
    padding-inline: var(--space-10);
  }
}

.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
  border-top: 1px solid var(--color-divider);
}

.eyebrow {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--color-faint);
}

.section-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
  max-width: 60ch;
}

.section-head h2 {
  font-size: var(--text-xl);
}

.section-head p {
  color: var(--color-muted);
  max-width: 62ch;
}

/* --- Header ---------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(252, 252, 251, 0.94);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.header.is-scrolled {
  border-bottom-color: var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.brand svg {
  color: var(--color-accent);
  flex: none;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav a {
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--color-muted);
  white-space: nowrap;
}

.nav a:hover {
  color: var(--color-text);
}

/* Below the desktop breakpoint the nav moves to its own scrollable strip. */
@media (max-width: 859px) {
  .header__inner {
    flex-wrap: wrap;
    padding-bottom: var(--space-2);
    min-height: 0;
    padding-top: var(--space-3);
    row-gap: var(--space-2);
  }

  .nav {
    order: 3;
    width: 100%;
    gap: var(--space-5);
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--space-1);
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav a {
    font-size: var(--text-xs);
  }

  html {
    scroll-padding-top: 7rem;
  }
}

.lang {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  flex: none;
}

.lang a {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.55rem;
  text-decoration: none;
  color: var(--color-muted);
}

.lang a + a {
  border-left: 1px solid var(--color-border);
}

.lang a[aria-current="true"] {
  background: var(--color-text);
  color: #fff;
}

.lang a:not([aria-current="true"]):hover {
  background: var(--color-offset);
  color: var(--color-text);
}

/* --- Hero ------------------------------------------------------------------ */
.hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24))
    clamp(var(--space-16), 9vw, var(--space-32));
}

.hero__grid {
  display: grid;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: start;
}

@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
}

.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-block: var(--space-5) var(--space-6);
}

.hero__lead {
  font-size: var(--text-lg);
  color: var(--color-muted);
  max-width: 46ch;
  line-height: 1.5;
}

.hero__quote {
  margin-top: var(--space-8);
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-base);
  color: var(--color-text);
  max-width: 44ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-10);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  padding: 0.6875rem var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn--ghost {
  border-color: var(--color-border);
  color: var(--color-text);
  background: var(--color-surface);
}

.btn--ghost:hover {
  border-color: var(--color-text);
}

.portrait {
  position: relative;
  max-width: 340px;
}

.portrait img {
  width: 100%;
  border-radius: var(--radius-md);
  filter: grayscale(100%) contrast(1.02);
}

.portrait figcaption {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-faint);
}

@media (min-width: 900px) {
  .portrait {
    justify-self: end;
  }
}

/* --- Services -------------------------------------------------------------- */
.services {
  display: grid;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 700px) {
  .services {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .services {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service {
  background: var(--color-surface);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.service__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  color: var(--color-accent);
  letter-spacing: 0.1em;
}

.service h3 {
  font-size: var(--text-lg);
  font-weight: 600;
}

.service p {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.6;
}

/* --- Stack ----------------------------------------------------------------- */
.stack {
  display: grid;
  gap: var(--space-8);
}

.stack__row {
  display: grid;
  gap: var(--space-4);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}

.stack__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

@media (min-width: 780px) {
  .stack__row {
    grid-template-columns: 13rem minmax(0, 1fr);
    gap: var(--space-8);
    align-items: baseline;
  }
}

.stack__label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-faint);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chips li {
  font-size: var(--text-sm);
  line-height: 1.35;
  padding: 0.3125rem 0.625rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
}

/* --- Profile --------------------------------------------------------------- */
.profile {
  display: grid;
  gap: clamp(var(--space-10), 5vw, var(--space-16));
}

@media (min-width: 900px) {
  .profile {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}

.profile__prose p + p {
  margin-top: var(--space-5);
}

.profile__prose p {
  max-width: 60ch;
  color: var(--color-muted);
}

.profile__prose strong {
  color: var(--color-text);
  font-weight: 500;
}

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

.facts div {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

@media (min-width: 480px) {
  .facts div {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }
}

.facts dt {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-faint);
}

.facts dd {
  font-size: var(--text-sm);
  color: var(--color-text);
}

/* --- Open source ----------------------------------------------------------- */
.repos {
  display: grid;
  gap: 1px;
  background: var(--color-border);
  border-block: 1px solid var(--color-border);
}

.repo {
  background: var(--color-surface);
  display: grid;
  gap: var(--space-1);
  padding: var(--space-5) 0;
  padding-inline: var(--space-1);
  text-decoration: none;
}

@media (min-width: 780px) {
  .repo {
    grid-template-columns: 14rem minmax(0, 1fr) auto;
    gap: var(--space-6);
    align-items: baseline;
    padding-inline: var(--space-4);
  }
}

.repo:hover {
  background: var(--color-offset);
}

.repo__name {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-accent);
}

.repo__desc {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.repo__host {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  color: var(--color-faint);
  white-space: nowrap;
}

/* --- Contact --------------------------------------------------------------- */
.contact {
  background: var(--color-offset);
  border-top: 1px solid var(--color-border);
}

.contact__grid {
  display: grid;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
}

@media (min-width: 860px) {
  .contact__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.contact h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-3);
}

.contact__note {
  margin-top: var(--space-5);
  color: var(--color-muted);
  max-width: 44ch;
}

.contact__list {
  display: grid;
  gap: var(--space-6);
}

.contact__item {
  display: grid;
  gap: var(--space-1);
}

.contact__item .eyebrow {
  color: var(--color-muted);
}

.contact__item a,
.contact__item span {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.015em;
  text-decoration: none;
  word-break: break-word;
}

.contact__item a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: color-mix(
    in srgb,
    var(--color-accent) 35%,
    transparent
  );
}

.contact__item a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

/* --- Footer ---------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  align-items: center;
  justify-content: space-between;
}

.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

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

.footer a:hover {
  color: var(--color-text);
}

.footer__copy {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  color: var(--color-faint);
}

/* --- Legal pages ----------------------------------------------------------- */
.legal {
  padding-block: clamp(var(--space-12), 7vw, var(--space-24));
}

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

.legal h1 {
  font-size: var(--text-xl);
  margin-block: var(--space-3) var(--space-10);
}

.legal h2 {
  font-size: var(--text-lg);
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
}

.legal h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.legal p,
.legal li {
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.legal p + p {
  margin-top: var(--space-4);
}

.legal ul {
  list-style: disc;
  padding-left: var(--space-5);
  margin-top: var(--space-3);
  display: grid;
  gap: var(--space-2);
}

.legal a {
  color: var(--color-accent);
  text-underline-offset: 3px;
}

.legal a.btn--primary {
  color: #fff;
  text-decoration: none;
}

.legal a.btn--ghost {
  color: var(--color-text);
  text-decoration: none;
}

.legal address {
  font-style: normal;
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.8;
  margin-top: var(--space-3);
}

.legal .back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--color-muted);
}

.legal .back:hover {
  color: var(--color-text);
}