/* Xerchem — static corporate site
   Palette: logo-derived charcoal/navy, blue & green accents */

:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #1e272e;
  --color-text-muted: #5c6670;
  --color-border: #e4e8ec;
  --color-dark: #1a2332;
  --color-dark-soft: #243044;
  --color-accent-blue: #2d8dd4;
  --color-accent-blue-hover: #2480c2;
  --color-accent-green: #2bb86a;
  --color-accent-green-hover: #24a35c;
  --font: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgba(26, 35, 50, 0.06), 0 4px 12px rgba(26, 35, 50, 0.06);
  --shadow-hover: 0 4px 16px rgba(26, 35, 50, 0.1);
  --header-h: 72px;
  --content-max: 1120px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--color-dark);
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  z-index: 200;
  transform: translateY(-120%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--color-accent-green);
  outline-offset: 2px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

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

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-dark);
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.65rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.45rem, 2.8vw, 1.85rem);
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

p:last-child {
  margin-bottom: 0;
}

/* Layout */
.wrap {
  width: min(100% - 2rem, var(--content-max));
  margin-inline: auto;
}

.section {
  padding: clamp(3rem, 8vw, 5rem) 0;
}

.section--tight {
  padding: clamp(2rem, 5vw, 3rem) 0;
}

.section--surface {
  background: var(--color-surface);
}

.section--dark {
  background: linear-gradient(165deg, var(--color-dark) 0%, var(--color-dark-soft) 100%);
  color: #e8eaed;
}

.section--dark h1,
.section--dark h2,
.section--dark h3 {
  color: #fff;
}

.section--dark p {
  color: rgba(232, 234, 237, 0.88);
}

.section__eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-green);
  margin-bottom: 0.75rem;
}

.section--dark .section__eyebrow {
  color: #6dd89a;
}

.section__title {
  margin-bottom: 0.5rem;
}

.section__lead {
  max-width: 42rem;
  font-size: 1.05rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-dark);
  font-weight: 600;
  font-size: 1.05rem;
}

.site-header__brand:hover {
  color: var(--color-dark);
}

.site-header__logo {
  width: 44px;
  height: auto;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

@media (max-width: 880px) {
  .site-header__nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 2rem;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s var(--ease), opacity 0.25s var(--ease), visibility 0.25s;
    overflow-y: auto;
  }

  .site-header__nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-header__nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 500;
  }

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

  .site-header__nav .btn {
    margin-top: 1rem;
    text-align: center;
  }
}

.site-header__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-dark);
  cursor: pointer;
}

.site-header__toggle:hover {
  background: rgba(45, 141, 212, 0.08);
  border-color: rgba(45, 141, 212, 0.35);
}

@media (min-width: 881px) {
  .site-header__toggle {
    display: none;
  }

  .site-header__nav a:not(.btn) {
    padding: 0.5rem 0.85rem;
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--radius-sm);
  }

  .site-header__nav a:not(.btn):hover {
    background: rgba(45, 141, 212, 0.08);
    color: var(--color-dark);
  }

  .site-header__nav a.is-active {
    color: var(--color-accent-blue);
  }

  .site-header__nav .btn {
    margin-left: 0.5rem;
  }
}

.site-header__lang {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.site-header__lang a {
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  color: var(--color-text-muted);
}

.site-header__lang a:hover {
  color: var(--color-dark);
  background: rgba(0, 0, 0, 0.05);
}

.site-header__lang a.is-active {
  color: var(--color-dark);
  background: rgba(45, 141, 212, 0.12);
}

.site-header__lang span {
  color: var(--color-border);
  user-select: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), transform 0.15s var(--ease), box-shadow 0.2s;
  text-decoration: none;
}

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

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

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

.btn--secondary {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.btn--outline {
  background: var(--color-surface);
  color: var(--color-dark);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
}

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

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

.btn__arrow {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

/* Hero */
.hero {
  position: relative;
  padding: clamp(3.5rem, 10vw, 6rem) 0;
  background: linear-gradient(135deg, #15202e 0%, var(--color-dark) 45%, #1e3a4a 100%);
  color: #e8eaed;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 85% 20%, rgba(45, 141, 212, 0.18) 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 10% 80%, rgba(43, 184, 106, 0.12) 0%, transparent 50%);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.hero__eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #7dd3a8;
  margin-bottom: 1rem;
}

.hero h1 {
  color: #fff;
  margin-bottom: 1rem;
}

.hero__lead {
  font-size: 1.1rem;
  line-height: 1.65;
  color: rgba(232, 234, 237, 0.9);
  max-width: 36rem;
  margin-bottom: 1.75rem;
}

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

.hero__panel {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  backdrop-filter: blur(8px);
}

.hero__panel h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.hero__panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero__panel li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: rgba(232, 234, 237, 0.88);
}

.hero__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-green);
}

/* Cards & grids */
.grid-3 {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-2 {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-4 {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s var(--ease), border-color 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  border-color: rgba(45, 141, 212, 0.25);
}

.card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(45, 141, 212, 0.12), rgba(43, 184, 106, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--color-accent-blue);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card__title {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.card--product {
  display: flex;
  flex-direction: column;
}

.card--product .card__meta {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-green);
  margin-bottom: 0.35rem;
}

/* Industries */
.industry-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.industry-card__visual {
  height: 120px;
  background: linear-gradient(145deg, #dfe6ee 0%, #c5d4e3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
}

.industry-card__visual--a {
  background: linear-gradient(135deg, #2d8dd4 0%, #1a5f8a 100%);
}

.industry-card__visual--b {
  background: linear-gradient(135deg, #2bb86a 0%, #1a7a4a 100%);
}

.industry-card__visual--c {
  background: linear-gradient(135deg, #3d6b8a 0%, #243044 100%);
}

.industry-card__visual--d {
  background: linear-gradient(135deg, #5a6570 0%, #2d8dd4 55%);
}

.industry-card__label {
  padding: 1rem 1.1rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-dark);
}

/* Geography */
.geo-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.geo-pill {
  padding: 0.45rem 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-dark);
}

/* Footer */
.site-footer {
  background: var(--color-dark);
  color: rgba(232, 234, 237, 0.75);
  padding: 2.5rem 0 2rem;
  font-size: 0.9rem;
}

.site-footer a {
  color: rgba(232, 234, 237, 0.9);
}

.site-footer a:hover {
  color: #fff;
}

.site-footer__grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}

.site-footer h3 {
  color: #fff;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li {
  margin-bottom: 0.5rem;
}

.site-footer__bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8rem;
  color: rgba(232, 234, 237, 0.55);
}

/* Page header (inner pages) */
.page-hero {
  padding: clamp(2.5rem, 6vw, 3.5rem) 0;
  background: linear-gradient(165deg, var(--color-dark) 0%, #1c2838 100%);
  color: #e8eaed;
}

.page-hero h1 {
  color: #fff;
}

.page-hero p {
  color: rgba(232, 234, 237, 0.88);
  max-width: 40rem;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1.15fr;
    align-items: start;
  }
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(45, 141, 212, 0.15);
}

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

.form-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

/* Products filter / categories */
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.category-tab {
  padding: 0.45rem 0.95rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.category-tab:hover,
.category-tab.is-active {
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
  background: rgba(45, 141, 212, 0.06);
}

.disclaimer {
  margin-top: 2.5rem;
  padding: 1rem 1.25rem;
  background: rgba(45, 141, 212, 0.06);
  border-left: 3px solid var(--color-accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Utilities */
.text-center {
  text-align: center;
}

.mt-0 {
  margin-top: 0;
}

.mb-lg {
  margin-bottom: 2rem;
}

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