/* Biro Systems – shared stylesheet. Design: "biro-systems-website_v4".
   Fonts (Geist, Geist Mono) are self-hosted; no external resources (privacy + CSP: no inline styles either). */
@font-face {
  font-family: 'Geist';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(geist-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Geist';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(geist-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(geist-mono-symbols.woff2) format('woff2');
  unicode-range: U+2000-2001, U+2004-2008, U+200A, U+23B8-23BD, U+2500-259F;
}
@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(geist-mono-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(geist-mono-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------------------------------------------------------------- tokens (design "biro-systems-website_v4") */
:root {
  color-scheme: light;
  --ink: #0b0c0e;
  --ink-2: #3d4148;
  --muted: #555a63;
  --faint: #6b7079;
  --line: #e6e8ea;
  --line-soft: #eef0f1;
  --band: #f7f8f8;
  --chip: #f1f2f3;
  --accent: #0f7b4f;
  --green: #16a36a;
  --mint: #d3f2e2;
  --mint-ink: #0a5a39;
  --btn-hover: #2a2d32;
  --font: 'Geist', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --gutter: clamp(20px, 4vw, 40px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  background: #fff; color: var(--ink); font-family: var(--font);
  font-size: 16px; line-height: 1.5; -webkit-font-smoothing: antialiased;
}
main { flex: 1; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, p, ul, ol { margin: 0; }
section { scroll-margin-top: 68px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 var(--gutter); }

/* ---------------------------------------------------------------- logo: the b/ mark + wordmark in Geist Mono Medium */
.logo, .logo:hover { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.logo-mark { height: 22px; width: auto; flex: none; }
.logo-b { fill: currentColor; }
.logo-s { fill: var(--accent); }
.logo-word { font-family: var(--mono); font-weight: 500; font-size: 18px; display: flex; }
.logo-word span { color: var(--accent); }

/* ---------------------------------------------------------------- header */
.site-header { position: sticky; top: 0; z-index: 10; background: #fff; border-bottom: 1px solid var(--line-soft); }
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.nav { display: flex; gap: 28px; font-size: 14px; flex-wrap: wrap; }
.nav a { color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.header-right { display: flex; gap: 18px; align-items: center; }
.lang-switch { display: flex; gap: 4px; font-family: var(--mono); font-size: 12px; color: var(--faint); }
.lang-switch a { color: var(--faint); }
.lang-switch a:hover, .lang-switch [aria-current] { color: var(--ink); }
.lang-switch > :not(:first-child)::before { content: "/"; margin-right: 4px; color: var(--faint); }

/* ---------------------------------------------------------------- buttons and links */
.btn, .btn:hover { display: inline-block; font-weight: 500; font-size: 15px; line-height: 1.5; background: var(--ink); color: #fff; padding: 13px 20px; border-radius: 8px; }
.btn:hover { background: var(--btn-hover); }
.btn-sm, .btn-sm:hover { font-size: 14px; padding: 10px 16px; white-space: nowrap; }
.btn-lg, .btn-lg:hover { padding: 14px 22px; }
.link-arrow { font-weight: 500; font-size: 15px; color: var(--ink); padding: 13px 8px; }
.link-arrow:hover { color: var(--accent); }

/* ---------------------------------------------------------------- hero */
.hero { padding: clamp(64px, 10vw, 120px) 0 clamp(56px, 8vw, 96px); }
.hero-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); gap: clamp(40px, 6vw, 72px); align-items: center; }
.hero-copy { display: flex; flex-direction: column; gap: 28px; }
.eyebrow { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 13px; color: var(--accent); }
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green); flex: none; }
.hero h1 { font-size: clamp(34px, 6vw, 72px); font-weight: 600; line-height: 1.02; letter-spacing: -0.04em; text-wrap: balance; }
.lead { font-size: clamp(17px, 1.6vw, 19px); line-height: 1.6; color: var(--muted); max-width: 540px; text-wrap: pretty; }
.hero-actions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.hero-media { min-width: 0; border-radius: 16px; overflow: hidden; border: 1px solid var(--line); aspect-ratio: 6 / 5; background: #f3f4f4; }
.hero-media img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 52% 48%; }

/* ---------------------------------------------------------------- sections */
.band { background: var(--band); }
#ai, #about { border-top: 1px solid var(--line-soft); }
.stack { padding-block: clamp(64px, 8vw, 96px); display: flex; flex-direction: column; gap: 48px; }
.head { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr)); gap: 24px 72px; align-items: end; }
.head-title, .split-copy { display: flex; flex-direction: column; gap: 14px; }
.kicker { font-family: var(--mono); font-size: 13px; color: var(--accent); }
h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 600; line-height: 1.08; letter-spacing: -0.035em; text-wrap: balance; }
.head-intro { font-size: 17px; line-height: 1.6; color: var(--muted); text-wrap: pretty; }

.cards { display: grid; gap: 16px; }
.cards-4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.cards-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 28px; display: flex; flex-direction: column; gap: 14px; }
.card-index { font-family: var(--mono); font-size: 12px; color: var(--faint); }
.card h3 { font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.card p { font-size: 15px; line-height: 1.6; color: var(--muted); }

.arrow-list { margin-top: 6px; padding: 14px 0 0; border-top: 1px solid var(--line-soft); list-style: none; display: flex; flex-direction: column; gap: 8px; font-family: var(--mono); font-size: 12.5px; color: var(--ink-2); }
.arrow-list li { position: relative; padding-left: 1.6em; }
.arrow-list li::before { content: "→"; position: absolute; left: 0; }
.arrow-list-plain { margin: 0; padding: 0; border-top: 0; gap: 8px; font-family: var(--font); font-size: 14px; line-height: 1.5; }
.arrow-list-plain li { padding-left: 20px; }
.arrow-list-plain li::before { color: var(--accent); }

/* AI */
.card-lg { border-radius: 12px; padding: 32px; gap: 16px; }
.card-label { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.card-lg h3 { font-size: 24px; letter-spacing: -0.025em; }
.check-list { margin-top: 8px; padding: 0; list-style: none; display: flex; flex-direction: column; border-top: 1px solid var(--line); font-size: 15px; line-height: 1.5; }
.check-list li { position: relative; padding: 12px 0 12px 24px; border-bottom: 1px solid var(--line); }
.check-list li:last-child { border-bottom: 0; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 12px; color: var(--accent); font-family: var(--mono); }

/* Projects */
.project { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; display: flex; flex-direction: column; }
.project-visual { padding: 28px; min-height: 220px; display: flex; flex-direction: column; justify-content: space-between; gap: 24px; }
.visual-okostrader { background: #081912; }
.brand { display: flex; align-items: center; gap: 14px; }
.brand-word { font-family: var(--mono); font-weight: 500; font-size: 24px; letter-spacing: -0.01em; display: flex; color: #fff; }
.ring { width: 40px; height: 40px; border: 4px solid #f2ede0; border-radius: 50%; position: relative; flex: none; }
.ring-dot { position: absolute; width: 11px; height: 11px; border-radius: 50%; background: #ef9f27; top: 3px; right: 4px; }
.c-cream { color: #f2ede0; } .c-amber { color: #ef9f27; }
.console { font-family: var(--mono); font-size: 12.5px; line-height: 1.9; display: flex; flex-direction: column; }
.visual-okostrader .console { color: #9db3a6; }
.visual-okostrader .c-ok { color: #5dcaa5; }
.visual-okostrader .console-prompt { color: #f2ede0; }
.visual-okostrader .c-cursor { color: #ef9f27; }
.cursor { animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; } }

.project-body { padding: 28px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.pill { align-self: flex-start; font-family: var(--mono); font-size: 12px; background: var(--mint); color: var(--mint-ink); padding: 4px 10px; border-radius: 999px; }
.project-body h3 { font-size: 22px; font-weight: 600; letter-spacing: -0.025em; }
.project-body > p { font-size: 15px; line-height: 1.6; color: var(--muted); }
.fineprint { font-size: 12.5px; line-height: 1.6; color: var(--faint); }

/* Process and About */
.split { padding-block: clamp(64px, 8vw, 96px); display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: 40px 72px; }
.steps { list-style: none; padding: 0; display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.steps li { display: grid; grid-template-columns: 56px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.step-no { font-family: var(--mono); font-size: 13px; color: var(--accent); padding-top: 4px; }
.steps h3 { font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.steps p { margin-top: 6px; font-size: 15px; line-height: 1.6; color: var(--muted); }
.about-photo img { display: block; width: 100%; height: auto; border-radius: 16px; }
.split-copy .about-body { margin-top: 10px; }
.about-body { display: flex; flex-direction: column; gap: 28px; }
.about-body p { font-size: 17px; line-height: 1.7; color: var(--ink-2); text-wrap: pretty; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; font-family: var(--mono); font-size: 12px; }
.tag { background: var(--chip); color: var(--ink-2); padding: 5px 12px; border-radius: 999px; }
.tag-hl { background: var(--mint); color: var(--mint-ink); }

/* Contact */
.contact .wrap { padding-bottom: clamp(56px, 8vw, 80px); }
.panel { background: var(--band); border: 1px solid var(--line); border-radius: 14px; padding: clamp(36px, 6vw, 72px); display: flex; justify-content: space-between; align-items: center; gap: 40px; flex-wrap: wrap; }
.panel-copy { display: flex; flex-direction: column; gap: 16px; max-width: 560px; }
.panel-copy p { font-size: 17px; line-height: 1.6; color: var(--muted); }
.panel-action { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.panel-mail { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.panel-mail:hover { color: var(--ink); }
.panel-phone { font-family: var(--mono); font-size: 13px; color: var(--muted); }

/* ---------------------------------------------------------------- legal pages */
.legal { padding: 64px 0 88px; }
.legal h1 { font-size: clamp(32px, 4vw, 44px); font-weight: 600; letter-spacing: -0.035em; margin-bottom: 28px; }
.legal h2 { font-size: 20px; letter-spacing: -0.02em; line-height: 1.3; margin: 36px 0 10px; }
.legal p, .legal li { max-width: 72ch; color: var(--ink-2); line-height: 1.6; }
.legal .note { font-size: 14.5px; color: var(--faint); border-left: 3px solid var(--accent); padding-left: 12px; }
.placeholder { background: #ffe9a8; color: #3a2e00; padding: 0 4px; border-radius: 3px; }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line-soft); }
.footer-inner { padding-block: 32px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.site-footer .logo-word { font-size: 15px; }
.site-footer .logo-mark { height: 18px; }
.footer-meta { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; font-size: 12.5px; }
.counter { display: inline-flex; align-items: center; gap: 6px; }
.counter img { height: 1.1em; width: auto; }
.footer-nav { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.footer-nav a { color: var(--muted); }
.footer-nav a:hover { color: var(--ink); }

/* ---------------------------------------------------------------- phones */
@media (max-width: 700px) {
  section { scroll-margin-top: 104px; }
  .header-inner { padding-block: 10px; row-gap: 8px; }
  .nav { order: 3; width: 100%; flex-wrap: nowrap; gap: 20px; overflow-x: auto; scrollbar-width: none; }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { white-space: nowrap; }
}
@media (max-width: 480px) {
  .site-header .btn-sm { display: none; }  /* the hero button carries the same call to action */
}

/* ---------------------------------------------------------------- contact overlays (:target, no JavaScript) */
.modal { position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center; padding: 20px; }
.modal:target { display: flex; }
body:has(.modal:target) { overflow: hidden; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(11, 12, 14, 0.55); cursor: default; }
.modal-box {
  position: relative; width: min(100%, 580px); max-height: calc(100vh - 40px); overflow: auto;
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  box-shadow: 0 24px 60px rgba(11, 12, 14, 0.28); padding: clamp(24px, 4vw, 40px);
  display: flex; flex-direction: column; gap: 16px;
}
.modal-small { width: min(100%, 440px); align-items: flex-start; }
.modal-close, .modal-close:hover { position: absolute; top: 14px; right: 14px; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 8px; color: var(--faint); font-size: 18px; line-height: 1; }
.modal-close:hover { background: var(--chip); color: var(--ink); }
.modal h2 { font-size: clamp(26px, 3.2vw, 32px); padding-right: 40px; }
.modal-intro { font-size: 15px; line-height: 1.6; color: var(--muted); }
.modal-icon { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; font-family: var(--mono); font-weight: 500; font-size: 20px; }
.modal-ok { background: var(--mint); color: var(--mint-ink); }
.modal-err { background: #fde8e8; color: #9b1c1c; }

.form { display: flex; flex-direction: column; gap: 14px; margin-top: 4px; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field span { font-size: 13px; font-weight: 500; color: var(--ink-2); }
.field input, .field textarea {
  width: 100%; font: inherit; font-size: 15px; color: var(--ink); background: #fff;
  border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px;
}
.field textarea { resize: vertical; min-height: 120px; line-height: 1.5; }
.field input:focus, .field textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }
.consent { display: grid; grid-template-columns: 18px 1fr; gap: 10px; align-items: start; font-size: 13px; line-height: 1.5; color: var(--muted); }
.consent input { margin: 2px 0 0; width: 16px; height: 16px; accent-color: var(--accent); }
.consent a { text-decoration: underline; text-underline-offset: 2px; }
.form .btn { align-self: flex-start; border: 0; cursor: pointer; font-family: inherit; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }   /* honeypot: invisible to people */

/* Side by side: the photo starts level with the heading, below the small "Über uns" label (13px × 1.5 line + 14px gap) */
@media (min-width: 840px) {
  .about-photo { margin-top: 33.5px; }
}

/* ---------------------------------------------------------------- small screens */
img { max-width: 100%; }
/* grid children may shrink below their content width (a wide image must not widen the page) */
.hero-grid > *, .head > *, .split > *, .cards > *, .form-row > * { min-width: 0; }

/* phones: smaller pictures */
@media (max-width: 700px) {
  .hero-media { aspect-ratio: 16 / 10; }
  .about-photo img { aspect-ratio: 4 / 3; object-fit: cover; object-position: 50% 25%; }
}


/* About: social links, last row */
.social { display: flex; gap: 8px; flex-wrap: wrap; font-family: var(--mono); font-size: 12px; }
.social-link { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-2); border: 1px solid var(--line); padding: 6px 14px 6px 10px; border-radius: 999px; }
.social-icon { width: 16px; height: 16px; fill: currentColor; flex: none; }
.social-link:hover { color: var(--accent); border-color: var(--accent); }
.social-icon-line { fill: none; stroke: currentColor; stroke-width: 2; }
.social-icon-line .dot { fill: currentColor; stroke: none; }

/* About: a wider text column so all tag chips fit on one row (the English ones are the longest) */
@media (min-width: 840px) {
  #about .split { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); }
}

/* link to the product site at the bottom of a project card */
.project-link { margin-top: auto; padding-top: 6px; font-family: var(--mono); font-weight: 500; font-size: 13px; color: var(--ink); }
.project-link:hover { color: var(--accent); }

/* a single project: picture panel left, text right */
.cards-1 { grid-template-columns: 1fr; }
@media (min-width: 900px) {
  .cards-1 .project { flex-direction: row; }
  .cards-1 .project-visual { flex: 0 0 46%; min-height: 0; }
  .cards-1 .project-body { flex: 1; padding: 36px; justify-content: center; }
}