/* Voltwerk — industrial automation site */

:root {
  --ink: #eaf4ff;
  --ink-muted: #9bb0c4;
  --bg: #05070f;
  --bg-elev: #0b101c;
  --bg-soft: #101828;
  --line: rgba(234, 244, 255, 0.12);
  --accent: #36f6ff;
  --accent-dim: rgba(54, 246, 255, 0.14);
  --accent-strong: #1fd4de;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 1120px;
  --gutter: clamp(1.1rem, 3vw, 1.75rem);
  --nav-h: 72px;
  --radius: 4px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(54, 246, 255, 0.08), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(40, 90, 140, 0.18), transparent 50%),
    linear-gradient(180deg, #070b16 0%, var(--bg) 40%, #04060c 100%);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

.container {
  width: min(var(--max), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

/* ——— Header ——— */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 7, 15, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--max), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.brand span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 0.15rem 1.1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-main a {
  font-size: 0.92rem;
  color: var(--ink-muted);
  transition: color 0.2s var(--ease);
}

.nav-main a:hover,
.nav-main a[aria-current="page"] {
  color: var(--ink);
}

.nav-main a.nav-cta {
  color: var(--bg);
  background: var(--accent);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.85rem;
}

.nav-main a.nav-cta:hover {
  color: var(--bg);
  background: var(--accent-strong);
}

.lang {
  display: flex;
  gap: 0.25rem;
  margin-left: 0.5rem;
}

.lang button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.45rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.lang button[aria-pressed="true"],
.lang button:hover {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink);
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  cursor: pointer;
}

@media (max-width: 960px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .nav-main,
  .lang {
    display: none;
  }

  body.nav-open .nav-main {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    padding: 1rem var(--gutter) 1.25rem;
    background: rgba(5, 7, 15, 0.97);
    border-bottom: 1px solid var(--line);
    gap: 0.75rem;
  }

  body.nav-open .lang {
    display: flex;
    position: absolute;
    top: calc(var(--nav-h) + 0.75rem);
    right: var(--gutter);
    z-index: 50;
  }
}

/* ——— Hero ——— */

.hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.04);
  animation: hero-drift 18s var(--ease) infinite alternate;
}

@keyframes hero-drift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.1) translate3d(-1.5%, -1%, 0); }
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(5, 7, 15, 0.92) 0%, rgba(5, 7, 15, 0.72) 42%, rgba(5, 7, 15, 0.35) 100%),
    linear-gradient(0deg, rgba(5, 7, 15, 0.95) 0%, rgba(5, 7, 15, 0.2) 45%, rgba(5, 7, 15, 0.45) 100%);
}

.hero-content {
  width: min(var(--max), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: clamp(4rem, 12vh, 7rem) clamp(3rem, 8vh, 5rem);
  max-width: 38rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 0.95;
  margin: 0 0 1rem;
  color: var(--ink);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 0.85rem;
  color: var(--ink);
}

.hero .lead {
  margin: 0 0 1.75rem;
  color: var(--ink-muted);
  font-size: 1.05rem;
  max-width: 34rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease), color 0.2s;
}

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

.btn-solid {
  background: var(--accent);
  border-color: var(--accent);
  color: #041018;
}

.btn-solid:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #041018;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: rgba(54, 246, 255, 0.45);
  color: var(--accent);
}

/* ——— Sections ——— */

.section {
  padding-block: clamp(3.5rem, 8vw, 5.5rem);
}

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

.section-head {
  max-width: 38rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.65rem;
}

.section-head h2,
.page-hero h1,
.prose h2 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
}

.section-head p,
.page-hero .lead {
  margin: 0;
  color: var(--ink-muted);
}

/* Services list — not cards in hero; interaction containers OK here as linked blocks */

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.service-grid a {
  display: block;
  background: var(--bg-elev);
  padding: 1.5rem 1.35rem;
  transition: background 0.25s var(--ease);
}

.service-grid a:hover {
  background: var(--bg-soft);
  color: var(--ink);
}

.service-grid .num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 0.85rem;
}

.service-grid h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.service-grid p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

@media (max-width: 860px) {
  .service-grid {
    grid-template-columns: 1fr;
  }
}

/* Process */

.process {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}

.process li {
  list-style: none;
}

.process ol {
  margin: 0;
  padding: 0;
  display: contents;
}

.process .step-n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}

.process h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
}

.process p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

@media (max-width: 860px) {
  .process {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .process {
    grid-template-columns: 1fr;
  }
}

/* Industries */

.industries {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.industries span {
  border: 1px solid var(--line);
  padding: 0.45rem 0.75rem;
  font-size: 0.88rem;
  color: var(--ink-muted);
  border-radius: var(--radius);
}

/* Split media */

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.split img {
  width: 100%;
  height: min(420px, 55vw);
  object-fit: cover;
  border-radius: var(--radius);
}

.split.reverse {
  direction: rtl;
}

.split.reverse > * {
  direction: ltr;
}

@media (max-width: 860px) {
  .split,
  .split.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
}

/* Cases */

.case-list {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.case-item {
  background: var(--bg-elev);
  padding: 1.5rem 1.4rem;
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1.25rem;
}

.case-item .sector {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.case-item h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 0.4rem;
}

.case-item p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .case-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}

/* CTA band */

.cta-band {
  background:
    linear-gradient(135deg, rgba(54, 246, 255, 0.08), transparent 50%),
    var(--bg-elev);
  border-block: 1px solid var(--line);
  padding-block: clamp(3rem, 7vw, 4.5rem);
}

.cta-band .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.cta-band p {
  margin: 0;
  color: var(--ink-muted);
  max-width: 28rem;
}

/* Page hero (inner pages) */

.page-hero {
  padding-block: clamp(3rem, 8vw, 4.5rem) 2rem;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  max-width: 18ch;
}

/* Prose / service detail */

.prose {
  max-width: 40rem;
}

.prose p {
  color: var(--ink-muted);
}

.prose ul {
  padding-left: 1.1rem;
  color: var(--ink-muted);
}

.prose li + li {
  margin-top: 0.35rem;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.feature-list article {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.feature-list h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
}

.feature-list p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .feature-list {
    grid-template-columns: 1fr;
  }
}

/* Contact */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.contact-list {
  display: grid;
  gap: 1.25rem;
}

.contact-list dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.contact-list dd {
  margin: 0;
  color: var(--ink);
}

.contact-list a {
  color: var(--ink);
}

.contact-list a:hover {
  color: var(--accent);
}

.form {
  display: grid;
  gap: 0.85rem;
}

.form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.form input,
.form textarea,
.form select {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  font: inherit;
}

.form input:focus,
.form textarea:focus,
.form select:focus {
  outline: 1px solid var(--accent);
  border-color: var(--accent);
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

.form-note {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin: 0;
}

@media (max-width: 760px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* Reveal motion */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem 2.5rem;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.site-footer .inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
}

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

.legal {
  padding-block: 3rem;
}

.legal h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: 0 0 1rem;
}

.legal p,
.legal li {
  color: var(--ink-muted);
}

/* Norms strip */

.norms {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-top: 1.5rem;
}

.norms span {
  border-left: 2px solid var(--accent);
  padding-left: 0.55rem;
}