/* Holger Weber - International Typographic Style (Swiss grid)
   Cool ink neutrals, no accent colour (pure monochrome), zero corner radius.
   No warm paper, no serif display, no gradients. Light and dark mode.
   Self-hosted Geist (Vercel) display sans + Geist Mono. */

@font-face {
  font-family: "Geist";
  src: url("fonts/Geist-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("fonts/GeistMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  /* Default theme is DARK (noir). Cool blue-grey neutrals, monochrome. */
  color-scheme: dark;

  --paper: #0e1012;
  --surface: #16191c;
  --surface-sunk: #1d2124;
  --ink: #f0f2f3;
  --text: #b4babf;
  --muted: #8d949a;
  --line: #23272b;
  --line-strong: #353b40;
  --on-ink: #0e1012;

  /* No accent hue: pure ink-on-paper monochrome. "accent" resolves to ink,
     so emphasis comes from weight and rule thickness, not colour. */
  --accent: #f0f2f3;
  --accent-ink: #0e1012;

  --font-sans: "Geist", "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --shell: 1260px;
  --gutter: clamp(1.25rem, 4vw, 2.75rem);
  --col-gap: clamp(1rem, 2.2vw, 2.25rem);
  --header-h: 68px;
  --measure: 60ch;
}

:root[data-theme="light"] {
  color-scheme: light;

  --paper: #ecedef;
  --surface: #ffffff;
  --surface-sunk: #e2e4e7;
  --ink: #0f1113;
  --text: #42474c;
  --muted: #5f666c;
  --line: #d0d4d8;
  --line-strong: #b0b6bc;
  --on-ink: #f2f3f4;

  --accent: #0f1113;
  --accent-ink: #f2f3f4;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  letter-spacing: -0.005em;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
  height: auto;
}

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

/* Typography scale: hierarchy by weight and tracking, not raw scale */

h1,
h2,
h3 {
  color: var(--ink);
  margin: 0;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.1rem, 3.7vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.032em;
}

h2 {
  font-size: clamp(1.45rem, 2.2vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

h3 {
  font-size: 1.0625rem;
  line-height: 1.3;
  letter-spacing: -0.012em;
}

p {
  margin: 0;
}

.lead {
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  line-height: 1.45;
  letter-spacing: -0.015em;
  color: var(--ink);
}

a {
  color: var(--ink);
  text-decoration: none;
}

/* Inline text links only. Buttons keep their own colour system. */
.prose a:not(.btn),
address a {
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.prose a:not(.btn):hover,
address a:hover {
  background: var(--accent);
  color: var(--accent-ink);
}

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

/* Grid shell */

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

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--col-gap);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 30;
  background: var(--ink);
  color: var(--on-ink);
  padding: 0.75rem 1.1rem;
  font-size: 0.9rem;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

/* Header: one line, 68px, hairline base */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  /* No hairline; a soft shadow separates the sticky bar from content on scroll */
  box-shadow: 0 6px 18px -10px rgba(0, 0, 0, 0.16);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: var(--header-h);
}

.wordmark {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-transform: uppercase;
}

.wordmark span {
  font-weight: 400;
  color: var(--muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2.2vw, 2rem);
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--text);
  padding-block: 0.3rem;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.site-nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* Hero: asymmetric split, 7 columns of type against a 4 column portrait */

.hero {
  min-height: calc(100svh - var(--header-h));
  display: flex;
  align-items: center;
  padding-block: clamp(2rem, 5vw, 3.75rem);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.hero-grid {
  /* Image centres against the text block: equal space above and below */
  align-items: center;
  row-gap: 2.5rem;
  width: 100%;
}

.hero-text {
  grid-column: 1 / span 7;
  display: grid;
  gap: 1.15rem;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--accent);
  justify-self: start;
}

.hero-lead {
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.5;
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 0.6rem;
}

.hero-portrait {
  grid-column: 9 / span 4;
  margin: 0;
  align-self: end;
}

.hero-portrait img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: 50% 14%;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  background: var(--ink);
  color: var(--on-ink);
  border: 1px solid var(--ink);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.005em;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.1s ease;
}

.btn:hover {
  /* Monochrome invert: the filled button flips to an outline */
  background: var(--paper);
  border-color: var(--ink);
  color: var(--ink);
}

.btn:active {
  transform: translateY(1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

.btn-ghost:hover {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

/* Sections */

.section {
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose {
  display: grid;
  gap: 1.1rem;
  align-content: start;
  max-width: var(--measure);
}

/* Layout family: sidehead (heading over portrait in the left column, content right) */

.sidehead h2 {
  grid-column: 1 / span 3;
  margin-bottom: 0.5rem;
}

.sidehead-portrait {
  grid-column: 1 / span 3;
  margin: 0;
  align-self: start;
}

.sidehead-portrait img {
  display: block;
  width: 100%;
  max-width: 17rem;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  object-position: 50% 20%;
}

.sidehead .prose {
  grid-column: 5 / span 7;
  grid-row: 2;
}

/* Layout family: data strip */

.data-strip {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  row-gap: 1.5rem;
  padding-top: 0.5rem;
}

.data-strip > div {
  grid-column: span 3;
}

.data-strip dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted);
}

.data-strip dd {
  margin: 0.5rem 0 0;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.4;
}

/* Layout family: manifesto statement block */

.statement {
  row-gap: 1.5rem;
}

.statement h2 {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.statement-display {
  grid-column: 1 / span 11;
  font-size: clamp(1.55rem, 3vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--ink);
  max-width: 24ch;
}

.statement .statement-body {
  grid-column: 3 / span 7;
  display: grid;
  gap: 1.1rem;
  max-width: 58ch;
}

/* Layout family: topic blocks, mixed cell weights */

.topics {
  margin-top: clamp(2rem, 4vw, 3rem);
  row-gap: clamp(1.75rem, 3vw, 2.5rem);
}

.topic {
  grid-column: span 6;
  padding-top: 1.1rem;
}

.topic h3 {
  letter-spacing: -0.01em;
}

.topic p {
  margin-top: 0.6rem;
  max-width: 44ch;
}

.topic-wide {
  grid-column: 1 / -1;
  background: var(--surface);
  padding: clamp(1.5rem, 3vw, 2.25rem);
}

.topic-wide > p {
  max-width: 62ch;
}

.topic-wide .cases,
.topic-wide .principle {
  max-width: 62ch;
}

.topic-plain {
  grid-column: 1 / -1;
}

.topic-plain p {
  max-width: 60ch;
}

.cases {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--col-gap);
  margin: 1.75rem 0 0;
}

.cases dt {
  color: var(--ink);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  padding-top: 0.35rem;
}

.cases dd {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text);
}

.principle {
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  max-width: none;
}

/* Layout family: editorial feature with a pull quote */

.erfahrung {
  row-gap: 2rem;
}

.erfahrung h2 {
  grid-column: 1 / -1;
}

.erfahrung-lead {
  grid-column: 1 / span 6;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
}

.erfahrung-pull {
  grid-column: 8 / span 5;
  margin: 0;
  font-style: normal;
  font-size: clamp(1.2rem, 1.7vw, 1.45rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--ink);
  padding-left: 1.25rem;
  border-left: 4px solid var(--ink);
}

.erfahrung-body {
  grid-column: 2 / span 9;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  max-width: 62ch;
}

/* Layout family: quote pair */

.quotes {
  margin-top: clamp(2rem, 4vw, 3rem);
  align-items: start;
  row-gap: clamp(2rem, 4vw, 3rem);
}

.quote {
  grid-column: span 6;
  margin: 0;
  padding-top: 1.25rem;
}

.quote blockquote {
  margin: 0;
}

.quote blockquote p {
  font-size: clamp(1.2rem, 1.6vw, 1.45rem);
  line-height: 1.42;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-indent: -0.42em;
}

.quote figcaption {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* Layout family: event/termine entries */

.termine {
  margin-top: clamp(2rem, 4vw, 3rem);
  align-items: start;
  row-gap: clamp(2rem, 4vw, 3rem);
}

.termin {
  grid-column: span 6;
  padding-top: 1.25rem;
}

.termin-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 0.85rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
}

.termin h3 {
  font-size: 1.25rem;
}

.termin-lead {
  margin-top: 0.7rem;
  color: var(--ink);
  font-weight: 700;
  max-width: 46ch;
}

.termin .btn {
  margin-top: 1.5rem;
}


/* Layout family: contact split */

.contact h2 {
  grid-column: 1 / span 8;
  margin-bottom: 1.25rem;
}

.contact .prose {
  grid-column: 1 / span 6;
}

.contact-aside {
  grid-column: 8 / span 5;
  display: grid;
  gap: 1.5rem;
  justify-items: start;
  align-content: start;
  padding-top: 1.25rem;
}

.contact-aside address {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  line-height: 1.7;
  color: var(--ink);
}

.badge {
  width: 120px;
}

/* Badge (dark default): sits on its own light plate so the coloured logo reads on dark */
.badge {
  background: #ffffff;
  padding: 0.5rem;
}

:root[data-theme="light"] .badge {
  background: transparent;
  padding: 0;
}

/* Footer */

.site-footer {
  padding-block: 2.25rem;
}

.footer-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-footer p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.site-footer a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.site-footer a:hover {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* Tablet */

@media (max-width: 1023px) {
  .hero-text {
    grid-column: 1 / span 8;
  }

  .hero-portrait {
    grid-column: 9 / span 4;
  }

  .sidehead h2 {
    grid-column: 1 / -1;
    margin-bottom: 1rem;
  }

  .sidehead-portrait {
    grid-column: 1 / span 4;
  }

  .sidehead .prose {
    grid-column: 5 / span 8;
    grid-row: auto;
  }

  .statement h2,
  .statement-display,
  .statement .statement-body {
    grid-column: 1 / span 10;
  }

  .data-strip > div {
    grid-column: span 6;
  }

  .topic {
    grid-column: 1 / -1;
  }

  .cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .erfahrung-lead,
  .erfahrung-pull,
  .erfahrung-body {
    grid-column: 1 / span 9;
  }

  .erfahrung-pull,
  .erfahrung-body {
    margin-top: 1.1rem;
  }

  .quote {
    grid-column: 1 / -1;
  }

  .termin {
    grid-column: 1 / -1;
  }

  .contact .prose,
  .contact-aside {
    grid-column: 1 / -1;
  }

  .contact-aside {
    margin-top: 2.5rem;
  }
}

/* Mobile: every multi-column layout collapses to one column */

@media (max-width: 767px) {
  .hero {
    min-height: 0;
    padding-block: 2.25rem 3rem;
  }

  .hero-text,
  .hero-portrait,
  .sidehead-portrait,
  .sidehead .prose,
  .statement h2,
  .statement-display,
  .statement .statement-body,
  .erfahrung h2,
  .erfahrung-lead,
  .erfahrung-pull,
  .erfahrung-body,
  .contact h2,
  .data-strip > div {
    grid-column: 1 / -1;
  }

  .hero-portrait {
    max-width: 18rem;
  }

  .hero-portrait img {
    aspect-ratio: 1 / 1;
  }

  .sidehead .prose {
    grid-row: auto;
  }

  .sidehead-portrait {
    max-width: 18rem;
    margin-top: 1.5rem;
  }

  .cases {
    grid-template-columns: minmax(0, 1fr);
  }

  .btn {
    width: 100%;
  }

  .site-nav {
    gap: 0.75rem 1rem;
    font-size: 0.85rem;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    padding-block: 0.75rem;
    min-height: 0;
  }

  .site-nav {
    flex-wrap: wrap;
  }
}


/* Concept 1 - vertical chapter markers before key sections */

.section.marked > .shell > h2 {
  position: relative;
  padding-left: 1.6rem;
}

.section.marked > .shell > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  width: 3px;
  height: 0.92em;
  background: var(--ink);
}

@media (max-width: 767px) {
  .section.marked > .shell > h2 {
    padding-left: 1.2rem;
  }
  .section.marked > .shell > h2::before {
    width: 2px;
    height: 0.85em;
  }
}

/* Concept 2 - restrained entry motion (scroll reveal, reduced-motion safe) */

html.js .section,
html.js .hero-grid {
  opacity: 0;
  transform: translateY(18px);
}

html.js .section.in-view,
html.js .hero-grid.in-view {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  html.js .section,
  html.js .hero-grid {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Subtle portrait hover - a soft lift, not a wobble */
.hero-portrait img,
.sidehead-portrait img {
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-portrait img:hover,
.sidehead-portrait img:hover {
  transform: scale(1.015);
}

@media (prefers-reduced-motion: reduce) {
  .hero-portrait img,
  .sidehead-portrait img {
    transition: none;
  }
  .hero-portrait img:hover,
  .sidehead-portrait img:hover {
    transform: none;
  }
}

/* Dark-optimised photos (default). Light (data-theme=light) leaves them natural. */
.hero-portrait img,
.sidehead-portrait img {
  filter: brightness(0.94) contrast(1.03);
  box-shadow: 0 0 0 1px var(--line-strong);
}

:root[data-theme="light"] .hero-portrait img,
:root[data-theme="light"] .sidehead-portrait img {
  filter: none;
  box-shadow: none;
}

/* Theme toggle */
.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-strong);
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 767px) {
  .theme-toggle {
    margin-top: 0.25rem;
  }
}