/* ==========================================================================
   402 Solutions — shared stylesheet (EN + LT pages)
   ========================================================================== */

/* -- Fonts ---------------------------------------------------------------- */

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans/IBMPlexSans-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans/IBMPlexSans-Italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans/IBMPlexSans-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans/IBMPlexSans-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans/IBMPlexSans-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono/IBMPlexMono-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* -- Tokens ----------------------------------------------------------------
   Light is the default. Dark applies automatically via prefers-color-scheme,
   and can be forced either way with [data-theme] (set by the theme toggle).
   -------------------------------------------------------------------------- */

:root {
  --color-bg: #ffffff;
  --color-bg-elevated: #f5f7fa;
  --color-text: #14213d;
  --color-text-muted: #45546b;
  --color-brand: #0a2f5c;
  --color-link: #2563eb;
  --color-link-hover: #1d4ed8;
  --color-border: #e2e8f0;
  --color-border-input: #7b8ca6;
  --color-accent: #92400e;
  --color-accent-bg: #fbeee0;
  --color-on-brand: #ffffff;

  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6.5rem;

  --container-width: 72rem;
  --container-pad: clamp(1.25rem, 4vw, 3rem);
  --radius: 0.375rem;
  --border-width: 1px;

  --transition-fast: 150ms ease;
  --transition-med: 250ms ease;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0b1220;
    --color-bg-elevated: #131b2e;
    --color-text: #e7ecf5;
    --color-text-muted: #a6b3c9;
    --color-brand: #7ea6ff;
    --color-link: #7ea6ff;
    --color-link-hover: #a9c6ff;
    --color-border: #1d2740;
    --color-border-input: #64748b;
    --color-accent: #f0a63c;
    --color-accent-bg: #2b1d0c;
    --color-on-brand: #0b1220;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0b1220;
  --color-bg-elevated: #131b2e;
  --color-text: #e7ecf5;
  --color-text-muted: #a6b3c9;
  --color-brand: #7ea6ff;
  --color-link: #7ea6ff;
  --color-link-hover: #a9c6ff;
  --color-border: #1d2740;
  --color-border-input: #64748b;
  --color-accent: #f0a63c;
  --color-accent-bg: #2b1d0c;
  --color-on-brand: #0b1220;
  color-scheme: dark;
}

/* -- Reset ------------------------------------------------------------------ */

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

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

body,
h1,
h2,
h3,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

a {
  color: var(--color-link);
}

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

/* -- Base -------------------------------------------------------------------- */

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  transition: background-color var(--transition-med), color var(--transition-med);
}

main {
  display: block;
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.25rem, 5vw + 1rem, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
}

p {
  color: var(--color-text-muted);
}

.lede {
  font-size: 1.125rem;
  color: var(--color-text);
}

/* -- Focus & motion ----------------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
  border-radius: 2px;
}

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

html {
  scroll-behavior: smooth;
}

/* -- Utilities ----------------------------------------------------------------- */

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

.skip-link {
  position: absolute;
  top: -3rem;
  left: var(--space-4);
  z-index: 100;
  background: var(--color-brand);
  color: var(--color-on-brand);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

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

.eyebrow-plain {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* -- Buttons --------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: var(--border-width) solid transparent;
  min-height: 44px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary {
  background: var(--color-brand);
  color: var(--color-on-brand);
}

.btn-primary:hover {
  background: var(--color-link-hover);
  color: var(--color-on-brand);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-input);
}

.btn-secondary:hover {
  border-color: var(--color-link);
  color: var(--color-link);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  color: var(--color-text);
}

.icon-button:hover {
  background: var(--color-bg-elevated);
}

.icon-button svg {
  width: 20px;
  height: 20px;
}

#theme-toggle .icon-moon {
  display: none;
}

#theme-toggle.is-dark .icon-sun {
  display: none;
}

#theme-toggle.is-dark .icon-moon {
  display: block;
}

/* -- Header ------------------------------------------------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: var(--border-width) solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
}

.brand:hover {
  color: var(--color-text);
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-brand);
  border: var(--border-width) solid var(--color-brand);
  border-radius: var(--radius);
  padding: 0.125rem 0.4rem;
}

.brand-name {
  font-size: 1.0625rem;
}

/* No-JS fallback: nav stays inline and always visible. Once JS confirms it
   ran (html.js, set synchronously in <head>), mobile collapses it behind
   the hamburger; desktop always shows it regardless. */
.primary-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
}

.nav-link:hover {
  color: var(--color-link);
}

.header-utility {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.lang-switch a,
.lang-switch span {
  padding: var(--space-1) var(--space-2);
}

.lang-switch a {
  text-decoration: none;
  color: var(--color-text-muted);
  border-radius: var(--radius);
}

.lang-switch a:hover {
  color: var(--color-link);
  background: var(--color-bg-elevated);
}

.lang-switch [aria-current="true"] {
  color: var(--color-text);
  font-weight: 600;
}

.lang-switch .divider {
  color: var(--color-border-input);
}

.nav-toggle {
  display: none;
}

@media (max-width: 767.98px) {
  .js .nav-toggle {
    display: inline-flex;
  }

  .js .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: var(--border-width) solid var(--color-border);
    padding: var(--space-4) var(--container-pad);
  }

  .js .primary-nav.is-open {
    display: block;
  }

  .primary-nav .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .primary-nav .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-3) 0;
  }
}

/* -- Sections --------------------------------------------------------------- */

section {
  padding-block: var(--space-8);
  border-bottom: var(--border-width) solid var(--color-border);
}

section:last-of-type {
  border-bottom: none;
}

.section-title {
  margin-bottom: var(--space-5);
}

.section-intro {
  max-width: 42rem;
  margin-bottom: var(--space-6);
}

/* -- Hero --------------------------------------------------------------------- */

.hero {
  padding-block: var(--space-9) var(--space-8);
}

.hero-inner {
  max-width: 46rem;
}

.hero-title {
  margin-bottom: var(--space-5);
}

.hero-lede {
  margin-bottom: var(--space-4);
}

.hero-sub {
  font-size: 1.0625rem;
  max-width: 38rem;
  margin-bottom: var(--space-6);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
}

.link-arrow {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--color-border-input);
}

.link-arrow:hover {
  color: var(--color-link);
  border-color: var(--color-link);
}

/* -- Services ----------------------------------------------------------------- */

.services-list {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .services-list {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-7);
  }
}

.service-item {
  padding-top: var(--space-5);
  border-top: 2px solid var(--color-brand);
}

.service-item h3 {
  margin-bottom: var(--space-3);
  color: var(--color-brand);
}

/* -- Industries --------------------------------------------------------------- */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border: var(--border-width) solid var(--color-border);
  background: var(--color-bg-elevated);
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.tag-more {
  color: var(--color-text-muted);
  border-style: dashed;
  background: transparent;
  font-weight: 400;
}

/* -- About ---------------------------------------------------------------------- */

.about-body {
  max-width: 42rem;
}

.about-body p + p {
  margin-top: var(--space-4);
}

/* -- FAQ -------------------------------------------------------------------------- */

.faq-list {
  max-width: 46rem;
}

.faq-item {
  border-bottom: var(--border-width) solid var(--color-border);
  padding-block: var(--space-4);
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  margin-top: var(--space-3);
  max-width: 40rem;
}

/* -- Contact ------------------------------------------------------------------------ */

.contact-grid {
  display: grid;
  gap: var(--space-7);
}

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

.contact-info p + p {
  margin-top: var(--space-4);
}

.contact-direct {
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: var(--border-width) solid var(--color-border);
}

.contact-direct a {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.form-field {
  margin-bottom: var(--space-5);
}

.form-field label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: var(--space-2);
}

.form-field .hint {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: var(--space-3);
  background: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border-input);
  border-radius: var(--radius);
  font-size: 1rem;
}

.form-field textarea {
  min-height: 8rem;
  resize: vertical;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: 2px solid var(--color-link);
  outline-offset: 1px;
  border-color: var(--color-link);
}

.form-status {
  margin-top: var(--space-4);
  font-size: 0.9375rem;
  color: var(--color-text);
}

/* -- Footer ------------------------------------------------------------------------------ */

.site-footer {
  padding-block: var(--space-7);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }
}

.footer-legal {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-legal p + p {
  margin-top: var(--space-2);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.footer-lang {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .footer-lang {
    align-items: flex-end;
  }
}