/* ==========================================================================
   KAIROS PLUS SARL — Design system & site styles
   ========================================================================== */

:root {
  --navy: #0e2a5e;
  --navy-dark: #081b3d;
  --navy-tint: #eef1f8;
  --copper: #c46a2e;
  --copper-dark: #9c5322;
  --white: #ffffff;
  --anthracite: #23262b;
  --gray-900: #1a1c1f;
  --gray-700: #4b5158;
  --gray-500: #767c85;
  --gray-300: #d7dade;
  --gray-150: #eceef1;
  --gray-100: #f4f5f7;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --container-w: 1180px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(14, 42, 94, 0.08), 0 1px 2px rgba(14, 42, 94, 0.06);
  --shadow-md: 0 8px 24px rgba(14, 42, 94, 0.12);
  --header-h: 84px;
  --header-h-compact: 64px;

  --transition: 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------------------- reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h-compact); }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; font-weight: 700; color: var(--navy-dark); }
p { margin: 0 0 1em; color: var(--gray-700); }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }
svg { width: 1.5em; height: 1.5em; }

.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;
}

.skip-link {
  position: absolute; left: 8px; top: -60px;
  background: var(--navy); color: var(--white);
  padding: 0.75em 1.25em; border-radius: 0 0 8px 8px;
  z-index: 1000; transition: top var(--transition);
  font-weight: 600;
}
.skip-link:focus { top: 0; }

:focus-visible {
  outline: 3px solid var(--copper);
  outline-offset: 2px;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------------------------------------------------------- type */
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--copper-dark);
  margin: 0 0 0.75em;
}
.eyebrow-light { color: #ffb385; }
h2 { font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.4rem); }
h3 { font-size: 1.15rem; }
.section-intro { max-width: 62ch; font-size: 1.05rem; }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  padding: 0.85em 1.5em;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  font-size: 0.98rem;
}
.btn svg { width: 1.1em; height: 1.1em; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--copper); color: var(--white); }
.btn-primary:hover { background: var(--copper-dark); }
.btn-outline { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: var(--white); }
.btn-outline-light { background: transparent; color: var(--white); border-color: rgba(255,255,255,0.7); }
.btn-outline-light:hover { background: var(--white); color: var(--navy-dark); }
.btn-large { padding: 1em 2em; font-size: 1.05rem; }
.btn-small { padding: 0.55em 1.1em; font-size: 0.9rem; display: none; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 500;
  background: var(--white);
  box-shadow: 0 1px 0 var(--gray-150);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
  transition: height var(--transition);
}
.site-header.is-compact .header-inner { height: var(--header-h-compact); }
.brand { display: flex; align-items: center; }
.brand-logo { height: 44px; width: auto; transition: height var(--transition); }
.site-header.is-compact .brand-logo { height: 34px; }

.main-nav ul { display: flex; gap: 2rem; }
.main-nav a {
  text-decoration: none; font-weight: 600; color: var(--gray-900);
  padding: 0.5em 0; border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.main-nav a:hover { color: var(--navy); border-color: var(--copper); }

.header-actions { display: flex; align-items: center; gap: 1rem; }
.lang-switch {
  text-decoration: none; font-weight: 700; font-size: 0.9rem;
  color: var(--navy); border: 1.5px solid var(--gray-300); border-radius: 999px;
  padding: 0.4em 0.9em; transition: border-color var(--transition), background var(--transition);
}
.lang-switch:hover { border-color: var(--navy); background: var(--navy-tint); }

.menu-toggle {
  display: none; background: none; border: none; color: var(--navy-dark);
  width: 44px; height: 44px; align-items: center; justify-content: center;
  border-radius: 8px;
}
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-open { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

@media (max-width: 900px) {
  .btn-small { display: none; }
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed; inset: var(--header-h-compact) 0 0 0;
    background: var(--white);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    overflow-y: auto;
  }
  .main-nav.is-open { opacity: 1; transform: translateY(0); visibility: visible; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 1rem 24px 2rem; }
  .main-nav a { display: block; padding: 1em 0; border-bottom: 1px solid var(--gray-150); }
  .main-nav .nav-cta { display: block; margin-top: 1.5rem; }
}
.main-nav .nav-cta { display: none; }
@media (max-width: 900px) {
  .main-nav .nav-cta { display: inline-flex; }
}

/* ---------------------------------------------------------------- hero */
.hero {
  position: relative;
  color: var(--white);
  display: flex; align-items: center;
  min-height: 640px;
  overflow: hidden;
}
.hero-bg-img, .cta-bg-img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(8,27,61,0.94) 0%, rgba(8,27,61,0.82) 42%, rgba(8,27,61,0.55) 100%);
}
.hero-content { position: relative; padding: 7rem 24px 5rem; max-width: 760px; }
.hero h1 { color: var(--white); font-size: clamp(2rem, 1.5rem + 2.2vw, 3.2rem); margin-bottom: 0.55em; }
.hero-subtitle { color: #dbe2ef; font-size: 1.15rem; max-width: 58ch; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin: 2rem 0 2.5rem; }
.trust-line {
  display: flex; flex-wrap: wrap; gap: 0.6rem 1.6rem;
  font-weight: 700; letter-spacing: 0.03em; font-size: 0.92rem;
  color: #ffd9bd; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.22);
}

/* ---------------------------------------------------------------- sections */
.section { padding: 5.5rem 0; }
.section-alt { background: var(--gray-100); }

/* about */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 3.5rem; align-items: center; }
.about-img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.mission-vision { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 2rem; }
.mv-card { background: var(--navy-tint); border-radius: var(--radius); padding: 1.5rem; border-left: 4px solid var(--copper); }
.mv-card h3 { margin-bottom: 0.4em; font-size: 1.05rem; }
.mv-card p { margin: 0; font-size: 0.95rem; }

/* services */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.service-card {
  background: var(--white); border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.service-media { aspect-ratio: 4/3; overflow: hidden; }
.service-img { width: 100%; height: 100%; object-fit: cover; }
.service-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.service-icon { color: var(--copper); display: inline-flex; margin-bottom: 0.75rem; }
.service-icon svg { width: 2rem; height: 2rem; }
.service-body h3 { font-size: 1.1rem; }
.service-body p { font-size: 0.95rem; }
.service-details { margin-top: auto; }
.service-details summary {
  cursor: pointer; font-weight: 700; color: var(--navy); font-size: 0.92rem;
  list-style: none; display: flex; align-items: center; gap: 0.4em; padding: 0.4em 0;
}
.service-details summary::-webkit-details-marker { display: none; }
.service-details summary::after { content: '→'; transition: transform var(--transition); }
.service-details[open] summary::after { transform: rotate(90deg); }
.service-details ul { margin-top: 0.5rem; padding-left: 0.2rem; }
.service-details li { font-size: 0.9rem; color: var(--gray-700); padding: 0.3em 0 0.3em 1.1em; position: relative; }
.service-details li::before { content: ''; position: absolute; left: 0; top: 0.85em; width: 6px; height: 6px; border-radius: 50%; background: var(--copper); }

/* mining */
.mining-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 3.5rem; align-items: center; }
.mining-img { width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); aspect-ratio: 3/4; object-fit: cover; }
.check-list { margin-top: 1.5rem; display: grid; gap: 0.75rem; }
.check-list li { display: flex; gap: 0.75rem; align-items: flex-start; color: var(--gray-900); font-weight: 500; }
.check-list svg { color: var(--copper); flex-shrink: 0; width: 1.3rem; height: 1.3rem; margin-top: 0.15em; }

/* projects */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; margin-top: 2.5rem; }
.project-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.project-media { aspect-ratio: 4/3; overflow: hidden; }
.project-img { width: 100%; height: 100%; object-fit: cover; }
.project-body { padding: 1.5rem; }
.project-type { color: var(--copper-dark); font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.4em; }
.project-body h3 { margin-bottom: 0.4em; }
.project-meta { display: flex; justify-content: space-between; align-items: center; font-size: 0.88rem; color: var(--gray-500); font-weight: 600; margin-bottom: 0.75em; }
.project-meta span { display: inline-flex; align-items: center; gap: 0.3em; }
.project-meta svg { width: 1rem; height: 1rem; color: var(--copper); }
.project-note { max-width: 72ch; font-size: 0.95rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--gray-300); }

/* why us */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; margin-top: 2.5rem; }
.why-card { padding: 1.75rem; border: 1px solid var(--gray-150); border-radius: var(--radius-lg); }
.why-icon { display: inline-flex; align-items: center; justify-content: center; width: 2.5rem; height: 2.5rem; border-radius: 50%; background: var(--navy-tint); color: var(--navy); margin-bottom: 1rem; }
.why-icon svg { width: 1.3rem; height: 1.3rem; }
.why-card h3 { font-size: 1.05rem; }
.why-card p { font-size: 0.95rem; margin: 0; }

/* values */
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.value-card { background: var(--white); border-radius: var(--radius); padding: 1.5rem 1.75rem; border-top: 3px solid var(--copper); box-shadow: var(--shadow-sm); }
.value-card h3 { font-size: 1.05rem; }
.value-card p { font-size: 0.93rem; margin: 0; }

/* cta */
.cta { position: relative; color: var(--white); overflow: hidden; }
.cta-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(8,27,61,0.93), rgba(14,42,94,0.86)); }
.cta-content { position: relative; padding: 5rem 24px; text-align: center; max-width: 780px; margin: 0 auto; }
.cta-content h2 { color: var(--white); }
.cta-content p { color: #dbe2ef; font-size: 1.1rem; }
.cta .hero-actions { justify-content: center; margin-bottom: 0; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 3.5rem; align-items: start; }
.contact-info-title { margin-top: 2rem; font-size: 1rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--gray-500); }
.contact-list { display: grid; gap: 0.85rem; margin-top: 1rem; }
.contact-list a, .contact-list span { display: inline-flex; align-items: center; gap: 0.6em; text-decoration: none; font-weight: 600; color: var(--navy-dark); }
.contact-list svg { width: 1.2rem; height: 1.2rem; color: var(--copper); flex-shrink: 0; }
.contact-list a:hover { color: var(--copper); }
.whatsapp-link { margin-top: 1.75rem; }

.contact-form { background: var(--white); border: 1px solid var(--gray-150); border-radius: var(--radius-lg); padding: 2rem; box-shadow: var(--shadow-sm); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.form-field { margin-bottom: 1.25rem; }
.form-field label { display: block; font-weight: 700; font-size: 0.92rem; margin-bottom: 0.4em; color: var(--gray-900); }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 0.75em 0.9em; border: 1.5px solid var(--gray-300); border-radius: 8px;
  font-family: inherit; font-size: 0.98rem; background: var(--white); color: var(--gray-900);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  border-color: var(--navy); box-shadow: 0 0 0 3px rgba(14,42,94,0.12); outline: none;
}
.form-field textarea { resize: vertical; min-height: 120px; }
.field-error { color: #b3261e; font-size: 0.85rem; margin: 0.35em 0 0; min-height: 1.1em; font-weight: 600; }
.form-field.has-error input, .form-field.has-error select, .form-field.has-error textarea { border-color: #b3261e; }
.form-success {
  margin-top: 1.5rem; padding: 1.25rem 1.5rem; background: #eef7ee; border: 1px solid #bfe3bf;
  border-radius: var(--radius); color: #1e4620;
}
.form-success-title { font-weight: 700; margin-bottom: 0.3em; }
.form-success p:last-child { margin: 0; }

/* footer */
.site-footer { background: var(--anthracite); color: #c7cbd1; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: 2.5rem;
  padding: 4rem 24px 3rem;
}
.footer-brand img { height: 40px; width: auto; margin-bottom: 1rem; filter: brightness(0) invert(1); opacity: 0.95; }
.footer-brand p { color: #9ba1a9; font-size: 0.92rem; max-width: 32ch; }
.footer-social { display: flex; gap: 1rem; margin-top: 1rem; }
.footer-social a { color: #c7cbd1; text-decoration: none; font-weight: 600; font-size: 0.9rem; }
.footer-social a:hover { color: var(--white); }
.site-footer h3 { color: var(--white); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem; }
.site-footer nav ul, .footer-contact ul { display: grid; gap: 0.7rem; }
.site-footer nav a { text-decoration: none; color: #c7cbd1; font-size: 0.95rem; }
.site-footer nav a:hover { color: var(--white); }
.footer-contact .contact-list a, .footer-contact .contact-list span { color: #c7cbd1; font-weight: 500; }
.footer-contact .contact-list a:hover { color: var(--white); }
.footer-contact svg { color: #ffb385; }
.footer-bottom { border-top: 1px solid #383b40; }
.footer-bottom-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; padding: 1.5rem 24px; font-size: 0.85rem; color: #9ba1a9; }
.footer-bottom-inner a { text-decoration: none; color: #9ba1a9; }
.footer-bottom-inner a:hover { color: var(--white); }
.legal-notice { background: #1a1c1f; padding: 2rem 0; font-size: 0.85rem; color: #8a9098; }
.legal-notice h2 { color: #c7cbd1; font-size: 1rem; margin-bottom: 0.6em; }
.legal-notice p { color: #8a9098; margin-bottom: 0.4em; }
.legal-notice .legal-note { font-style: italic; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .about-grid, .mining-grid, .contact-grid { grid-template-columns: 1fr; }
  .mining-media { order: -1; }
  .mining-img { aspect-ratio: 16/9; }
  .project-grid { grid-template-columns: 1fr 1fr; }
  .mission-vision { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 3.5rem 0; }
  .hero-content { padding: 6rem 20px 3.5rem; }
  .service-grid { grid-template-columns: 1fr; }
  .why-grid, .value-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; padding: 3rem 20px 2rem; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
  .hero-actions, .cta .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-large { width: 100%; }
  .container { padding: 0 20px; }
}