/* ═══════════════════════════════════════════════
   LPI — Laser Process Intelligence
   Industrial Premium Design System
   ═══════════════════════════════════════════════ */

/* --- Tokens --- */
:root {
  --bg-primary: #080c12;
  --bg-secondary: #0e1420;
  --bg-tertiary: #141c2a;
  --bg-card: #111827;
  --text-primary: #e8edf5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #c8362e;
  --accent-hover: #e04039;
  --accent-subtle: rgba(200, 54, 46, 0.12);
  --border: rgba(148, 163, 184, 0.08);
  --border-light: rgba(148, 163, 184, 0.15);
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-body: 'Outfit', sans-serif;
  --max-w: 1140px;
  --max-w-narrow: 820px;
  --section-pad: clamp(5rem, 10vw, 9rem);
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 1rem;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.2; }
h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); letter-spacing: -0.03em; font-weight: 400; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); letter-spacing: -0.01em; }
h4 { font-size: 1rem; font-family: var(--font-mono); font-weight: 400; color: var(--text-secondary); letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.78rem; }

.mono { font-family: var(--font-mono); }
.muted { color: var(--text-muted); }
.secondary { color: var(--text-secondary); }
.accent { color: var(--accent); }

/* --- Layout --- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 clamp(1.5rem, 4vw, 3rem); }
.narrow { max-width: var(--max-w-narrow); }
.section { padding: var(--section-pad) 0; }
.section--tight { padding: clamp(3rem, 6vw, 5rem) 0; }

/* --- Navigation --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1rem 0;
  background: transparent;
  transition: background var(--transition), padding var(--transition);
}
.nav.scrolled {
  background: rgba(8, 12, 18, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max-w); margin: 0 auto; padding: 0 clamp(1.5rem, 4vw, 3rem);
  overflow: visible; position: relative;
}
.nav__logo {
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.08em;
  color: var(--text-secondary); text-transform: uppercase;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0;
  flex: 1 1 auto; margin-right: 2rem;
}
.nav__logo strong { color: var(--text-primary); font-weight: 500; }
.nav__links { display: flex; gap: 1.3rem; align-items: center; flex-shrink: 0; }
.nav__links a {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--text-muted);
  transition: color var(--transition); position: relative;
}
.nav__links a:hover, .nav__links a.active { color: var(--text-primary); }
.nav__links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--accent);
}

/* Mobile nav toggle */
.nav__toggle { display: none; background: none; border: none; color: var(--text-primary); cursor: pointer; padding: 0.5rem; z-index: 101; flex-shrink: 0; order: 3; margin-left: auto; }
.nav__toggle svg { width: 28px; height: 28px; }

/* --- Language Switcher: Links variant --- */
.nav__lang {
  display: flex; gap: 0.5rem; align-items: center;
  margin-left: 1.5rem; padding-left: 1.5rem;
  border-left: 1px solid var(--border-light);
}
.nav__lang a {
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-muted);
  transition: color var(--transition);
}
.nav__lang a:hover { color: var(--text-primary); }
.nav__lang a.nav__lang-active { color: var(--text-primary); }
.nav__lang a.nav__lang-active::after { display: none; }

/* --- Language Switcher: Dropdown variant --- */
.nav__lang-dropdown {
  position: relative; margin-left: 1.5rem; padding-left: 1.5rem;
  border-left: 1px solid var(--border-light);
}
.nav__lang-btn {
  background: none; border: none; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-muted);
  transition: color var(--transition); padding: 0.2rem 0;
}
.nav__lang-btn:hover { color: var(--text-primary); }
.nav__lang-menu {
  display: none; position: absolute; top: 100%; right: 0;
  background: var(--bg-tertiary); border: 1px solid var(--border-light);
  padding: 0.4rem 0; margin-top: 0.5rem; min-width: 3rem;
  z-index: 200;
}
.nav__lang-dropdown:hover .nav__lang-menu { display: block; }
.nav__lang-menu a {
  display: block; padding: 0.3rem 0.8rem;
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-muted);
  transition: color var(--transition);
}
.nav__lang-menu a:hover { color: var(--text-primary); background: var(--bg-secondary); }
.nav__lang-menu a.nav__lang-active { color: var(--text-primary); }
.nav__lang-menu a.nav__lang-active::after { display: none; }

/* --- Hero --- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: 50% 40%;
  opacity: 0.35;
}
.hero__video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  opacity: 0.25;
}
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8,12,18,0.7) 0%, rgba(8,12,18,0.3) 40%, rgba(8,12,18,0.85) 100%);
}
.hero__content {
  position: relative; z-index: 2; padding: 8rem 0 5rem;
  max-width: var(--max-w); margin: 0 auto; padding-left: clamp(1.5rem, 4vw, 3rem); padding-right: clamp(1.5rem, 4vw, 3rem);
}
.hero__pre {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 2rem;
}
.hero__title { margin-bottom: 2rem; max-width: 42rem; }
.hero__title em {
  font-style: normal; color: var(--text-secondary); font-weight: 300;
}
.hero__sub {
  font-size: clamp(1rem, 1.8vw, 1.15rem); color: var(--text-secondary);
  max-width: 36rem; line-height: 1.7; margin-bottom: 3rem;
}
.hero__meta {
  display: flex; gap: 2rem; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--text-muted); letter-spacing: 0.04em;
}
.hero__meta span::before {
  content: ''; display: inline-block; width: 6px; height: 6px;
  background: var(--accent); border-radius: 50%; margin-right: 0.6rem;
  vertical-align: middle;
}

/* Hero subpage variant */
.hero--sub { min-height: 70vh; }
.hero--sub .hero__content { padding-top: 10rem; }
.hero--sub .hero__title { font-size: clamp(2rem, 4.5vw, 3.2rem); }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em;
  text-transform: uppercase; padding: 0.9rem 2rem;
  border: 1px solid var(--border-light); color: var(--text-primary);
  background: transparent; cursor: pointer; transition: all var(--transition);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn--filled {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn--filled:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn svg { width: 14px; height: 14px; }

/* --- Section Header --- */
.section-header { margin-bottom: 4rem; }
.section-header h4 { margin-bottom: 1rem; }
.section-header h2 { margin-bottom: 1rem; }
.section-header p { color: var(--text-secondary); max-width: 36rem; font-size: 1.05rem; }

/* --- Divider --- */
.divider {
  height: 1px; background: var(--border); margin: 0;
}

/* --- Grid --- */
.grid-2 {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}
.grid-3 {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 3rem);
}

/* --- Cards --- */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  padding: clamp(1.5rem, 3vw, 2.5rem); transition: border-color var(--transition);
}
.card:hover { border-color: var(--border-light); }
.card__number {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent);
  letter-spacing: 0.08em; margin-bottom: 1rem;
}
.card h3 { margin-bottom: 0.8rem; }
.card p { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Full-width image section --- */
.visual-break {
  position: relative; width: 100%; height: clamp(250px, 35vw, 420px);
  overflow: hidden;
}
.visual-break img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0.5;
}
.visual-break__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, transparent 30%, transparent 70%, var(--bg-primary) 100%);
}
.visual-break__caption {
  position: absolute; bottom: 1.5rem; right: 2rem;
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-muted);
  letter-spacing: 0.06em; text-transform: uppercase;
}

/* --- Placeholder Visual --- */
.placeholder-visual {
  background: var(--bg-tertiary); border: 1px dashed var(--border-light);
  display: flex; align-items: center; justify-content: center;
  min-height: 220px; padding: 2rem;
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted);
  letter-spacing: 0.04em; text-transform: uppercase; text-align: center;
}

/* --- Two-column text+image --- */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.split--reverse { direction: rtl; }
.split--reverse > * { direction: ltr; }
.split__image { overflow: hidden; }
.split__image img { width: 100%; height: auto; opacity: 0.85; }

/* --- Process flow visual --- */
.flow {
  display: flex; align-items: center; justify-content: center; gap: 1rem;
  padding: 3rem 0; flex-wrap: wrap;
}
.flow__step {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-primary);
  padding: 0.8rem 1.5rem; border: 1px solid var(--border-light);
  background: var(--bg-secondary); text-align: center; min-width: 140px;
}
.flow__arrow { color: var(--accent); font-size: 1.2rem; }

/* --- Quote / Callout --- */
.callout {
  border-left: 2px solid var(--accent);
  padding: 1.5rem 0 1.5rem 2rem;
  margin: 2.5rem 0;
}
.callout p {
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  color: var(--text-primary); font-weight: 300;
  line-height: 1.7;
}
.callout .attr {
  margin-top: 0.8rem; font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-muted); letter-spacing: 0.06em; text-transform: uppercase;
}

/* --- Phase blocks --- */
.phase-block {
  display: grid; grid-template-columns: auto 1fr; gap: 2rem;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}
.phase-block:last-child { border-bottom: none; }
.phase-block__marker {
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-light);
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent);
}
.phase-block__content h3 { margin-bottom: 0.6rem; }
.phase-block__content p { color: var(--text-secondary); font-size: 0.95rem; max-width: 38rem; }
.phase-block__tags {
  display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem;
}
.tag {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em;
  padding: 0.3rem 0.8rem; border: 1px solid var(--border);
  color: var(--text-muted); text-transform: uppercase;
}

/* --- About profile --- */
.about-profile {
  display: grid; grid-template-columns: 320px 1fr; gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.about-profile__image {
  aspect-ratio: 3/4; overflow: hidden;
}
.about-profile__image img {
  width: 100%; height: 100%; object-fit: cover; object-position: center 20%;
  filter: saturate(0.7);
}

/* --- Case Grid --- */
.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); }
.case-item {
  background: var(--bg-primary); padding: clamp(2rem, 4vw, 3rem);
  display: flex; flex-direction: column;
}
.case-item__image {
  height: 260px; overflow: hidden; margin-bottom: 1.5rem;
  background: var(--bg-tertiary); display: flex; align-items: center; justify-content: center;
}
.case-item__image img { width: 100%; height: 100%; object-fit: cover; }
.case-item h3 { margin-bottom: 0.6rem; }
.case-item p { color: var(--text-secondary); font-size: 0.92rem; flex: 1; }
.case-item__tags { margin-top: 1rem; }

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
}
.footer__inner {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
}
.footer__text {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-muted); letter-spacing: 0.04em;
}
.footer__links { display: flex; gap: 1.5rem; }
.footer__links a {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-muted); letter-spacing: 0.04em;
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--text-primary); }

/* --- Contact Form --- */
.form-group { margin-bottom: 1.5rem; }
.form-group label {
  display: block; font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--text-muted); letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.form-group input, .form-group textarea {
  width: 100%; padding: 0.8rem 1rem; background: var(--bg-secondary);
  border: 1px solid var(--border); color: var(--text-primary);
  font-family: var(--font-body); font-size: 0.95rem;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* --- Scroll reveal --- */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
  opacity: 1; transform: translateY(0);
}

/* --- Concentric diagram --- */
.diagram-container {
  display: flex; justify-content: center; align-items: center;
  padding: clamp(2rem, 6vw, 5rem) 0;
}
.diagram-container svg { max-width: 600px; width: 100%; height: auto; }

/* --- Sparse text blocks --- */
.sparse { max-width: 32rem; }
.sparse p { 
  font-size: clamp(1.05rem, 1.8vw, 1.2rem); 
  line-height: 1.8; font-weight: 300; 
  color: var(--text-primary); 
}
.sparse p + p { margin-top: 1.5rem; }
.sparse .secondary { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Statement (single strong line) --- */
.statement {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 300; line-height: 1.5;
  color: var(--text-primary);
  max-width: 36rem;
}
.statement em { font-style: normal; color: var(--text-secondary); }

/* --- Minimal list --- */
.min-list {
  display: flex; flex-direction: column; gap: 0.8rem;
  margin-top: 1.5rem;
}
.min-list__item {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--text-secondary); letter-spacing: 0.03em;
  padding-left: 1.2rem; position: relative;
}
.min-list__item::before {
  content: '—'; position: absolute; left: 0; color: var(--accent);
}
@media (max-width: 900px) {
  .grid-2, .split, .about-profile { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .split--reverse { direction: ltr; }
  .nav__links { display: none; }
  .nav__links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 100%; left: 0; right: 0; background: rgba(8,12,18,0.97);
    padding: 2rem; gap: 1.2rem; border-bottom: 1px solid var(--border);
  }
  .nav__lang {
    margin-left: 0; padding-left: 0; border-left: none;
    justify-content: center; padding-top: 1rem;
    margin-top: 0.5rem; border-top: 1px solid var(--border-light);
    gap: 1.2rem;
  }
  .nav__toggle { display: block; }
  .nav__logo { font-size: 0.62rem; }
  .hero__content { padding-top: 7rem; }
  .flow { flex-direction: column; }
  .flow__arrow { transform: rotate(90deg); }
}
@media (max-width: 600px) {
  .hero { min-height: 90vh; }
  .hero__meta { flex-direction: column; gap: 0.8rem; }
  .phase-block { grid-template-columns: 1fr; gap: 1rem; }
}