/* ========================================================
   Massif Tech — styles.css
   Mobile-first, single-page layout
   ======================================================== */

/* ----- Reset / Base ----- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg:        #f8f9fa;
  --color-surface:   #ffffff;
  --color-primary:   #1a3c5e;  /* deep navy */
  --color-accent:    #2d7dd2;  /* bright blue */
  --color-text:      #1f2d3d;
  --color-muted:     #5a6a7a;
  --color-border:    #dde3ea;
  --color-footer-bg: #1a3c5e;
  --color-footer-fg: #e8edf3;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-base: 1rem;
  --line-height: 1.7;

  --radius: 0.5rem;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
  --transition: 0.2s ease;

  --container-max: 1100px;
  --container-pad: 1.25rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

/* ----- Utility ----- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ----- Header / Nav ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: 0 2px 6px rgba(0,0,0,.25);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 3.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover,
.logo:focus-visible {
  text-decoration: underline;
}

.logo-icon {
  height: 26px;
  width: auto;
  color: #ffffff;
  flex-shrink: 0;
}

/* ----- Hero ----- */
.hero {
  background:
    linear-gradient(rgba(15, 30, 50, 0.55), rgba(15, 30, 50, 0.68)),
    url('static/cotagne.jpg') center/cover no-repeat;
  color: #ffffff;
  padding: 5rem var(--container-pad) 4.5rem;
  text-align: center;
}

.hero-logo-icon {
  height: 64px;
  width: auto;
  color: #ffffff;
  margin-bottom: 1.25rem;
  opacity: 0.92;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: #ffffffcc;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
}

.btn:hover,
.btn:focus-visible {
  background: #1e62b0;
  transform: translateY(-1px);
  text-decoration: none;
}

/* ----- Services Section ----- */
.services {
  padding: 4rem var(--container-pad);
}

.section-heading {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 2.5rem;
}

/* Card grid */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: 0 6px 18px rgba(0,0,0,.12);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.925rem;
  color: var(--color-muted);
}

/* ----- Footer ----- */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-fg);
  padding: 2.5rem var(--container-pad);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
}

.footer-contact {
  font-size: 0.9rem;
}

.footer-contact a {
  color: #9ecbf0;
}

.footer-contact a:hover,
.footer-contact a:focus-visible {
  color: #ffffff;
}

.footer-copy {
  font-size: 0.8rem;
  color: #7a9bbf;
}

/* ----- Focus styles (accessibility) ----- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}