/* ============================================================
   Qilestra Tech — Global Stylesheet
   Dark professional theme for a managed service provider site.
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-bg:          #0b0f19;
  --color-bg-alt:      #111827;
  --color-surface:     #1a2236;
  --color-surface-alt: #212d45;
  --color-border:      #2a3652;
  --color-accent:      #3b82f6;
  --color-accent-hover:#2563eb;
  --color-accent-glow: rgba(59,130,246,.15);
  --color-text:        #e2e8f0;
  --color-text-muted:  #94a3b8;
  --color-heading:     #f1f5f9;
  --color-success:     #22c55e;
  --color-warning:     #f59e0b;
  --color-danger:      #ef4444;
  --font-sans:         'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:         'JetBrains Mono', 'Fira Code', monospace;
  --max-width:         1200px;
  --radius:            8px;
  --transition:        .25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 700;
}

/* ---------- Utility ---------- */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section {
  padding: 5rem 0;
}

.section-label {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: .35rem .9rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: .75rem;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 640px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.6rem;
  border: none;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent-glow);
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(11,15,25,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .85rem;
  color: #fff;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: .9rem;
  font-weight: 500;
  position: relative;
  padding: .25rem 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-heading);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59,130,246,.08), transparent),
    var(--color-bg);
}

.hero-content {
  max-width: 720px;
}

.hero-content h1 {
  font-size: 3.25rem;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}

.hero-content h1 .accent {
  color: var(--color-accent);
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.hero-stats .stat h3 {
  font-size: 2rem;
  color: var(--color-accent);
}

.hero-stats .stat p {
  font-size: .85rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-glow);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: .5rem;
}

.card p {
  color: var(--color-text-muted);
  font-size: .95rem;
}

/* ---------- Case Study Cards ---------- */
.cs-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.cs-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.cs-card-header {
  padding: 1.75rem 2rem 0;
}

.cs-card-tag {
  display: inline-block;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  padding: .25rem .65rem;
  border-radius: 4px;
  margin-bottom: .75rem;
}
.cs-card-tag.identity   { background: rgba(99,102,241,.15); color: #818cf8; }
.cs-card-tag.security   { background: rgba(239,68,68,.12);  color: #f87171; }
.cs-card-tag.infra      { background: rgba(34,197,94,.12);  color: #4ade80; }
.cs-card-tag.linux      { background: rgba(245,158,11,.12); color: #fbbf24; }

.cs-card-body {
  padding: 0 2rem 2rem;
}

.cs-card h3 {
  font-size: 1.2rem;
  margin-bottom: .5rem;
}

.cs-card p {
  font-size: .9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.cs-card .tools {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1.25rem;
}

.tool-badge {
  font-size: .72rem;
  padding: .2rem .55rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.cs-card .read-more {
  font-size: .9rem;
  font-weight: 600;
}

/* ---------- Case Study Detail ---------- */
.cs-detail-hero {
  padding: 8rem 0 3rem;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(59,130,246,.06), transparent),
    var(--color-bg);
}

.cs-detail-hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  color: var(--color-text-muted);
  font-size: .9rem;
  margin-bottom: 1.5rem;
}

.cs-meta span {
  display: flex;
  align-items: center;
  gap: .4rem;
}

.cs-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.cs-body h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--color-border);
}

.cs-body h3 {
  font-size: 1.15rem;
  margin: 1.75rem 0 .75rem;
}

.cs-body p {
  margin-bottom: 1rem;
  color: var(--color-text);
}

.cs-body ul, .cs-body ol {
  margin: .75rem 0 1.25rem 1.5rem;
}
.cs-body ul { list-style: disc; }
.cs-body ol { list-style: decimal; }
.cs-body li {
  margin-bottom: .4rem;
  color: var(--color-text);
}

.cs-body code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--color-surface-alt);
  padding: .15em .4em;
  border-radius: 4px;
}

.cs-body pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  font-size: .85rem;
  line-height: 1.6;
}
.cs-body pre code {
  background: none;
  padding: 0;
}

.cs-tools-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1rem 0 1.5rem;
}

.cs-tool {
  font-family: var(--font-mono);
  font-size: .8rem;
  padding: .35rem .75rem;
  background: var(--color-accent-glow);
  border: 1px solid rgba(59,130,246,.25);
  border-radius: 4px;
  color: var(--color-accent);
}

.outcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}

.outcome-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}

.outcome-card .metric {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
}

.outcome-card .label {
  font-size: .8rem;
  color: var(--color-text-muted);
  margin-top: .25rem;
}

/* ---------- Services Grid ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.25rem;
  transition: border-color var(--transition), transform var(--transition);
}
.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.service-card .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: .75rem;
}

.service-card p {
  color: var(--color-text-muted);
  font-size: .92rem;
  margin-bottom: 1rem;
}

.service-card ul {
  list-style: none;
}

.service-card li {
  font-size: .88rem;
  color: var(--color-text-muted);
  padding: .3rem 0;
  padding-left: 1.25rem;
  position: relative;
}
.service-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ---------- Blog Cards ---------- */
.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}
.blog-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.blog-card .meta {
  font-size: .8rem;
  color: var(--color-text-muted);
  margin-bottom: .75rem;
  display: flex;
  gap: 1rem;
}

.blog-card h3 {
  font-size: 1.15rem;
  margin-bottom: .5rem;
}

.blog-card p {
  font-size: .92rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.blog-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

/* ---------- About Page ---------- */
.about-hero {
  padding: 8rem 0 3rem;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(59,130,246,.06), transparent),
    var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.value-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.value-item h4 {
  font-size: .95rem;
  margin-bottom: .35rem;
}

.value-item p {
  font-size: .85rem;
  margin-bottom: 0;
}

.certifications {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1rem;
}

.cert-badge {
  font-size: .78rem;
  font-weight: 600;
  padding: .35rem .75rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
}

/* ---------- Contact Form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: .4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: .75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: .92rem;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.contact-info-card h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.contact-info-card .info-row {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  margin-bottom: 1rem;
  font-size: .92rem;
  color: var(--color-text-muted);
}

.contact-info-card .info-icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  background: var(--color-accent-glow);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: .9rem;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer h4 {
  font-size: .9rem;
  margin-bottom: 1rem;
  color: var(--color-heading);
}

.footer p {
  font-size: .85rem;
  color: var(--color-text-muted);
}

.footer ul li {
  margin-bottom: .5rem;
}
.footer ul a {
  font-size: .85rem;
  color: var(--color-text-muted);
}
.footer ul a:hover {
  color: var(--color-heading);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .8rem;
  color: var(--color-text-muted);
}

/* ---------- Page Hero (generic for inner pages) ---------- */
.page-hero {
  padding: 8rem 0 3rem;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(59,130,246,.06), transparent),
    var(--color-bg);
}

.page-hero h1 {
  font-size: 2.5rem;
  margin-bottom: .75rem;
}

.page-hero p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 600px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px; right: 0; bottom: 0;
    width: 280px;
    background: var(--color-bg-alt);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    padding: 2rem;
    gap: 1.25rem;
    transform: translateX(100%);
    transition: transform var(--transition);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-toggle { display: flex; }

  .hero-content h1 { font-size: 2.25rem; }
  .hero-stats { flex-wrap: wrap; gap: 1.5rem; }

  .section-title { font-size: 1.75rem; }

  .card-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .cs-body { padding: 2rem 1rem 3rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.75rem; }
  .about-values { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .outcome-grid { grid-template-columns: 1fr 1fr; }
}