/* =========================================================
   QARE — Quality Assurance and Resident Engineering
   Industrial technical design system
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Color palette — industrial technical */
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-bg-dark: #0f1419;
  --color-bg-dark-soft: #1b2733;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-border-strong: #cbd5e1;

  --color-text: #0f1419;
  --color-text-soft: #4a5568;
  --color-text-muted: #6b7280;
  --color-text-on-dark: #f5f7fa;
  --color-text-on-dark-soft: #cbd5e1;

  --color-primary: #0a76e1;        /* QARE corporate blue */
  --color-primary-dark: #075cb3;
  --color-primary-soft: #e3f0fd;
  --color-accent: #ed6b2c;         /* technical orange — CTAs */
  --color-accent-dark: #c8541a;
  --color-success: #10b981;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 1.875rem;
  --fs-4xl: 2.5rem;
  --fs-5xl: 3.25rem;
  --fs-6xl: 4rem;

  /* Layout */
  --container: 1200px;
  --container-narrow: 880px;
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(15, 20, 25, 0.05);
  --shadow: 0 4px 12px rgba(15, 20, 25, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 20, 25, 0.12);

  --transition: 0.2s ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }
button { font-family: inherit; cursor: pointer; }
ul, ol { padding-left: 1.25rem; }
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75em;
}
h1 { font-size: clamp(2rem, 5vw, var(--fs-6xl)); }
h2 { font-size: clamp(1.75rem, 4vw, var(--fs-4xl)); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
p { margin: 0 0 1em; }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }
.section-tight { padding: 3rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-on-dark); }
.section-dark h1, .section-dark h2, .section-dark h3 { color: #fff; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.25rem; }

/* ---------- Eyebrow / labels ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
  font-weight: 600;
}
.eyebrow.on-dark { color: var(--color-accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: var(--fs-base);
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn-secondary.on-dark {
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}
.btn-secondary.on-dark:hover {
  background: #fff;
  color: var(--color-primary);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  padding: 0.5rem 0.75rem;
}
.btn-ghost:hover { color: var(--color-accent); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--container);
  margin: 0 auto;
  gap: 1rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-bg-dark);
}
.logo:hover { color: var(--color-primary); }
.logo-mark {
  width: 40px;
  height: 40px;
  display: block;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.logo-text { line-height: 1; }
.logo-text small {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 2px;
}

.main-nav { display: flex; align-items: center; gap: 0.25rem; }
.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.lang-switch {
  display: flex;
  gap: 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
}
.lang-switch a {
  padding: 0.4rem 0.6rem;
  color: var(--color-text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.lang-switch a.active {
  background: var(--color-bg-dark);
  color: #fff;
}
.lang-switch a:not(.active):hover { background: var(--color-bg-alt); }

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.menu-toggle svg { width: 22px; height: 22px; stroke: var(--color-text); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 5rem 0 6rem;
  background: linear-gradient(135deg, #0f1419 0%, #1b2733 55%, #0a76e1 100%);
  color: var(--color-text-on-dark);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}
.hero-image-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  filter: grayscale(60%);
}
.hero-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
  z-index: 1;
}
.hero-content { max-width: 760px; }
.hero h1 {
  color: #fff;
  margin-bottom: 1rem;
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, var(--fs-xl));
  color: var(--color-text-on-dark-soft);
  margin-bottom: 2.5rem;
  max-width: 640px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; }

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid rgba(255,255,255,0.12);
}
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 3.5vw, var(--fs-4xl));
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}
.stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: var(--fs-sm);
  color: var(--color-text-on-dark-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---------- Section heading block ---------- */
.section-heading { max-width: 720px; margin-bottom: 3rem; }
.section-heading.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-heading p { color: var(--color-text-soft); font-size: var(--fs-lg); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all var(--transition);
  height: 100%;
}
.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: var(--fs-xl); margin-bottom: 0.6rem; }
.card p { color: var(--color-text-soft); margin: 0; }

.card-dark {
  background: var(--color-bg-dark-soft);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--color-text-on-dark);
}
.card-dark p { color: var(--color-text-on-dark-soft); }
.card-dark .card-icon {
  background: rgba(237, 107, 44, 0.15);
  color: var(--color-accent);
}
.card-dark:hover { border-color: var(--color-accent); }

/* ---------- Feature list ---------- */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}
.feature-list li {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  padding: 0.5rem 0;
}
.feature-list li::before {
  content: '';
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary-soft);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a76e1' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 14px;
  background-repeat: no-repeat;
  background-position: center;
  margin-top: 2px;
}

/* ---------- Process / timeline ---------- */
.process-steps {
  display: grid;
  gap: 1.5rem;
  counter-reset: step;
}
.process-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.5rem;
  padding: 1.75rem;
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  align-items: start;
}
.process-step-num {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.process-step h3 { margin-bottom: 0.4rem; }
.process-step p { color: var(--color-text-soft); margin: 0; }

/* ---------- Two-column with image ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.split-image {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-alt);
  aspect-ratio: 4/3;
}
.split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- FAQ accordion ---------- */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--fs-lg);
  padding-right: 2rem;
  position: relative;
  list-style: none;
  color: var(--color-text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition);
}
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
  margin: 1rem 0 0;
  color: var(--color-text-soft);
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: 1.25rem;
  max-width: 600px;
}
.form-row { display: grid; gap: 1.25rem; grid-template-columns: 1fr 1fr; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--fs-base);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 58, 112, 0.12);
}
.form-group textarea { resize: vertical; min-height: 140px; }

/* ---------- Contact bar ---------- */
.contact-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  background: var(--color-bg-dark-soft);
  color: var(--color-text-on-dark);
  border-radius: var(--radius);
}
.contact-bar-item h4 {
  margin: 0 0 0.4rem;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.contact-bar-item p, .contact-bar-item a {
  margin: 0;
  color: #fff;
  font-weight: 500;
}
.contact-bar-item a:hover { color: var(--color-accent); }

/* ---------- CTA strip ---------- */
.cta-strip {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 4rem 0;
  text-align: center;
}
.cta-strip h2 { color: #fff; margin-bottom: 1rem; }
.cta-strip p {
  color: rgba(255,255,255,0.85);
  max-width: 620px;
  margin: 0 auto 2rem;
  font-size: var(--fs-lg);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark-soft);
  padding: 4rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.site-footer h4 {
  color: #fff;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; }
.site-footer a { color: var(--color-text-on-dark-soft); }
.site-footer a:hover { color: var(--color-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* ---------- Page hero (smaller, for inner pages) ---------- */
.page-hero {
  background: linear-gradient(135deg, #0f1419 0%, #1b2733 100%);
  color: var(--color-text-on-dark);
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
}
.page-hero-inner {
  position: relative;
  z-index: 1;
}
.page-hero h1 {
  color: #fff;
  font-size: clamp(2rem, 4vw, var(--fs-4xl));
  margin-bottom: 0.75rem;
}
.page-hero p {
  color: var(--color-text-on-dark-soft);
  font-size: var(--fs-lg);
  max-width: 720px;
  margin: 0;
}
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.breadcrumbs a { color: var(--color-text-on-dark-soft); }
.breadcrumbs a:hover { color: var(--color-accent); }

/* ---------- Mobile ---------- */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  .section { padding: 3.5rem 0; }
  .hero { padding: 4rem 0; }
  .main-nav,
  .lang-switch { display: none; }
  .menu-toggle { display: inline-flex; }

  /* When the mobile menu is open, the header-inner re-flows in column.
     Logo + toggle stay on the first row; nav and lang-switch flow below. */
  .site-header.menu-open .header-inner {
    flex-wrap: wrap;
    row-gap: 0.75rem;
    padding-bottom: 1.25rem;
  }
  .site-header.menu-open .main-nav {
    display: flex;
    flex-direction: column;
    flex-basis: 100%;
    order: 3;
    align-items: stretch;
    gap: 0.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
  }
  .site-header.menu-open .main-nav a { padding: 0.85rem 0.25rem; }
  .site-header.menu-open .lang-switch {
    display: inline-flex;
    flex-direction: row;
    flex-basis: 100%;
    order: 4;
    width: max-content;
    padding: 0;
    margin: 0;
    border: 1px solid var(--color-border-strong);
  }

  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .process-step { grid-template-columns: 1fr; gap: 0.5rem; padding: 1.25rem; }
}

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: 2.5rem; }
.muted { color: var(--color-text-muted); }