/* =========================================
   SIDANIC — style.css
   Dark navy + teal palette, Inter font,
   CSS Grid layout, no framework.
   ========================================= */


/* -----------------------------------------
   Custom Properties
   ----------------------------------------- */
:root {
  /* Colours */
  --clr-teal:           #35b88f;
  --clr-teal-hover:     #3dcf9f;
  --clr-teal-dark:      #27956e;   /* use for teal text on light bg — passes WCAG AA */
  --clr-teal-glow:      rgba(53, 184, 143, 0.14);
  --clr-bg-dark:        #0d1b2a;
  --clr-bg-card:        #112336;
  --clr-bg-light:       #f0f4f8;
  --clr-bg-white:       #ffffff;
  --clr-text-light:     #e2e8f0;
  --clr-text-muted:     #8fa8c0;
  --clr-text-dark:      #1a2a3a;
  --clr-text-dark-muted:#4a6475;
  --clr-border-dark:    rgba(255, 255, 255, 0.07);
  --clr-border-light:   rgba(0, 0, 0, 0.07);

  /* Typography */
  --font:               'Inter', 'Source Sans Pro', system-ui, sans-serif;

  /* Spacing */
  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  2rem;
  --sp-lg:  4rem;
  --sp-xl:  8rem;

  /* Layout */
  --max-w:      1100px;
  --nav-h:      64px;

  /* Radii */
  --r-sm:   6px;
  --r-md:   12px;
  --r-lg:   20px;

  /* Shadows */
  --shadow-sm:  0 1px 4px rgba(0,0,0,0.15);
  --shadow-md:  0 4px 20px rgba(0,0,0,0.18);
  --shadow-lg:  0 8px 40px rgba(0,0,0,0.24);

  /* Transitions */
  --t:       200ms ease;
  --t-slow:  420ms ease;
}


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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text-light);
  background: var(--clr-bg-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: default;
}

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

ul[role="list"] { list-style: none; }

a { color: inherit; text-decoration: none; }


/* -----------------------------------------
   Typography
   ----------------------------------------- */
h1 {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.3;
}


/* -----------------------------------------
   Layout Utilities
   ----------------------------------------- */
.container {
  width: min(var(--max-w), 100% - 2 * var(--sp-md));
  margin-inline: auto;
}

section {
  padding-block: var(--sp-lg);
}

.section-light {
  background: var(--clr-bg-light);
  color: var(--clr-text-dark);
}

.section-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--clr-teal);
  margin-bottom: var(--sp-xs);
}

.section-light .section-label {
  color: var(--clr-teal-dark);
}

.section-header {
  margin-bottom: var(--sp-md);
}

.section-header h2 {
  margin-top: 0.3rem;
}


/* -----------------------------------------
   Buttons
   ----------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.72rem 1.65rem;
  border-radius: var(--r-sm);
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    background var(--t),
    color var(--t),
    border-color var(--t),
    transform var(--t),
    box-shadow var(--t);
  white-space: nowrap;
  text-decoration: none;
}

.btn:hover  { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible {
  outline: 2px solid var(--clr-teal);
  outline-offset: 3px;
}

/* Primary */
.btn-primary {
  background: var(--clr-teal);
  color: var(--clr-bg-dark);
  border-color: var(--clr-teal);
}
.btn-primary:hover {
  background: var(--clr-teal-hover);
  border-color: var(--clr-teal-hover);
  box-shadow: 0 4px 22px rgba(53, 184, 143, 0.38);
}

/* Secondary */
.btn-secondary {
  background: transparent;
  color: var(--clr-teal);
  border-color: var(--clr-teal);
}
.btn-secondary:hover {
  background: var(--clr-teal-glow);
  box-shadow: 0 4px 20px rgba(53, 184, 143, 0.18);
}

/* Secondary on light background */
.section-light .btn-secondary {
  color: var(--clr-teal-dark);
  border-color: var(--clr-teal-dark);
}
.section-light .btn-secondary:hover {
  background: rgba(39, 149, 110, 0.09);
}

/* Large modifier */
.btn-lg {
  padding: 0.95rem 2.2rem;
  font-size: 1rem;
}


/* -----------------------------------------
   Navigation
   ----------------------------------------- */
#site-nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background var(--t-slow), box-shadow var(--t-slow);
}

#site-nav.scrolled {
  background: var(--clr-bg-dark);
  box-shadow: 0 1px 0 var(--clr-border-dark), var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--clr-text-light);
  transition: color var(--t);
}
.nav-logo:hover { color: var(--clr-teal); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color var(--t);
}
.nav-links a:hover { color: var(--clr-text-light); }

.nav-links .nav-cta {
  padding: 0.42rem 1.05rem;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--clr-teal);
  color: var(--clr-teal);
  font-weight: 600;
  transition: background var(--t), color var(--t), box-shadow var(--t), transform var(--t);
}
.nav-links .nav-cta:hover {
  background: var(--clr-teal-glow);
  transform: translateY(-1px);
}

/* Hamburger button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--r-sm);
  transition: background var(--t);
}
.nav-toggle:hover { background: rgba(255,255,255,0.06); }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-light);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}

/* Animate hamburger to ✕ when open */
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* -----------------------------------------
   Hero
   ----------------------------------------- */
#hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: var(--sp-xl);
  padding-inline: var(--sp-md);
  background: linear-gradient(
    160deg,
    #0d1b2a 0%,
    #0f2235 50%,
    #0d1b2a 100%
  );
  text-align: center;
}

.hero-content {
  max-width: 760px;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-teal);
  margin-bottom: var(--sp-sm);
}

#hero h1 {
  margin-bottom: var(--sp-sm);
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.18rem);
  color: var(--clr-text-muted);
  max-width: 580px;
  margin-inline: auto;
  margin-bottom: var(--sp-md);
}


/* -----------------------------------------
   About
   ----------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--sp-lg);
  align-items: center;
}

.about-photo img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  /* Placeholder tint if image is missing */
  background: var(--clr-bg-light);
  min-height: 200px;
}

.about-text h2 {
  margin-top: 0.3rem;
  margin-bottom: 0.5rem;
}

.about-roles {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--clr-teal-dark);
  margin-bottom: var(--sp-sm);
}

.about-text > p {
  color: var(--clr-text-dark-muted);
  font-size: 1.03rem;
  margin-bottom: var(--sp-md);
}


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

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-md);
}

.service-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border-dark);
  border-radius: var(--r-md);
  padding: var(--sp-md);
  transition:
    transform var(--t),
    box-shadow var(--t),
    border-color var(--t);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(53, 184, 143, 0.2);
  border-color: rgba(53, 184, 143, 0.28);
}

.service-card .fas {
  font-size: 1.65rem;
  color: var(--clr-teal);
  margin-bottom: var(--sp-sm);
  display: block;
}

.service-card h3 {
  margin-bottom: 0.45rem;
  color: var(--clr-text-light);
}

.service-card p {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
}


/* -----------------------------------------
   Case Studies
   ----------------------------------------- */
.case-studies {
  display: flex;
  flex-direction: column;
  gap: var(--sp-lg);
}

.case-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--clr-bg-white);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--clr-border-light);
  transition: box-shadow var(--t-slow), transform var(--t-slow);
}

.case-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* Reverse: image on the right */
.case-card--reverse .case-image {
  order: 2;
}
.case-card--reverse .case-text {
  order: 1;
}

.case-image {
  overflow: hidden;
  background: var(--clr-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  padding: var(--sp-lg);
}

.case-image img {
  max-width: 280px;
  max-height: 160px;
  width: 100%;
  height: auto;
  object-fit: contain;
  transition: transform 0.5s ease;
}

.case-card:hover .case-image img {
  transform: scale(1.05);
}

.logo-invert {
  filter: brightness(0);
}

.case-text {
  padding: var(--sp-lg) var(--sp-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-sm);
}

.case-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-teal-dark);
  background: rgba(39, 149, 110, 0.1);
  padding: 0.25rem 0.8rem;
  border-radius: 100px;
}

.case-text h3 {
  font-size: 1.3rem;
  color: var(--clr-text-dark);
  line-height: 1.25;
}

.case-text p {
  color: var(--clr-text-dark-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}


/* -----------------------------------------
   Stack
   ----------------------------------------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--sp-sm);
}

.tech-item {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border-dark);
  border-radius: var(--r-md);
  padding: 0.85rem var(--sp-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-light);
  text-align: center;
  transition: border-color var(--t), color var(--t), background var(--t), transform var(--t);
}

.tech-item:hover {
  border-color: rgba(53, 184, 143, 0.4);
  color: var(--clr-teal);
  background: var(--clr-teal-glow);
  transform: translateY(-2px);
}


/* -----------------------------------------
   Contact
   ----------------------------------------- */
#contact {
  text-align: center;
  background: var(--clr-bg-card);
  border-top: 1px solid var(--clr-border-dark);
  border-bottom: 1px solid var(--clr-border-dark);
}

.contact-inner {
  max-width: 560px;
  margin-inline: auto;
}

.contact-inner h2 {
  margin-top: 0.3rem;
  margin-bottom: var(--sp-sm);
}

.contact-inner > p {
  color: var(--clr-text-muted);
  font-size: 1.03rem;
  margin-bottom: var(--sp-md);
}


/* -----------------------------------------
   Footer
   ----------------------------------------- */
footer {
  background: var(--clr-bg-dark);
  border-top: 1px solid var(--clr-border-dark);
  padding-block: var(--sp-md);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-sm);
}

.footer-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--clr-text-light);
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
}


/* -----------------------------------------
   Entrance Animations
   ----------------------------------------- */
.section-animate {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.section-animate.is-visible {
  opacity: 1;
  transform: none;
}

/* Stagger service cards */
.services-grid .service-card:nth-child(2) { transition-delay: 0.08s; }
.services-grid .service-card:nth-child(3) { transition-delay: 0.16s; }
.services-grid .service-card:nth-child(4) { transition-delay: 0.24s; }
.services-grid .service-card:nth-child(5) { transition-delay: 0.32s; }
.services-grid .service-card:nth-child(6) { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .section-animate {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
  .btn:hover, .tech-item:hover, .service-card:hover, .case-card:hover {
    transform: none;
  }
}


/* -----------------------------------------
   Responsive — mobile (≤ 768px)
   ----------------------------------------- */
@media (max-width: 768px) {
  :root {
    --sp-lg: 3rem;
    --sp-xl: 5rem;
  }

  /* Nav */
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--clr-bg-dark);
    border-bottom: 1px solid var(--clr-border-dark);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-xs) var(--sp-md) var(--sp-sm);
  }

  .nav-links.is-open { display: flex; }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--clr-border-dark);
    color: var(--clr-text-light);
    font-size: 0.95rem;
  }

  .nav-links li:last-child a {
    border-bottom: none;
    margin-top: 0.4rem;
    padding-left: 0;
  }

  .nav-links .nav-cta {
    border: none;
    color: var(--clr-teal);
    padding-left: 0;
  }

  /* Hero */
  #hero { text-align: left; justify-content: flex-start; align-items: flex-end; }
  .hero-content { text-align: left; }
  .hero-sub { margin-inline: 0; }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-md);
  }
  .about-photo {
    max-width: 200px;
  }

  /* Case cards */
  .case-card {
    grid-template-columns: 1fr;
  }
  .case-card--reverse .case-image { order: 0; }
  .case-card--reverse .case-text  { order: 0; }

  .case-image { min-height: 200px; padding: var(--sp-md); }

  .case-text {
    padding: var(--sp-md);
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--sp-xs);
  }
}