/* ============ Reset & base tokens ============ */
:root {
  --c-bg: #ffffff;
  --c-surface: #fafbfc;
  --c-text: #1a1d24;
  --c-text-muted: #6b7280;
  --c-border: #e5e7eb;
  --c-accent: #0066cc;
  --c-accent-hover: #0052a3;
  --c-accent-soft: #e6f0fb;

  --f-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --f-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);

  --max-w: 1100px;
  --max-w-narrow: 780px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--f-sans);
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: var(--c-accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--c-accent-hover); }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 600; letter-spacing: -0.015em; }
h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 2.5vw, 2rem); margin-bottom: var(--space-md); }
h3 { font-size: 1.15rem; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--space-lg); }
.container-narrow { max-width: var(--max-w-narrow); margin: 0 auto; padding: 0 var(--space-lg); }
.muted { color: var(--c-text-muted); }
.eyebrow {
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: inline-block;
}

/* ============ Header / Nav ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex; align-items: center; gap: 8px;
  color: var(--c-text); font-weight: 600; font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--c-text); }
.brand-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-accent);
}

.nav-links { display: flex; align-items: center; gap: var(--space-lg); }
.nav-links a {
  color: var(--c-text); font-size: 0.95rem; font-weight: 500;
  padding: 6px 0; position: relative;
}
.nav-links a:hover { color: var(--c-accent); }
.nav-links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--c-accent);
}
.lang-switch {
  display: inline-flex; align-items: center; gap: 4px;
  margin-left: var(--space-md); padding-left: var(--space-md);
  border-left: 1px solid var(--c-border);
  font-size: 0.85rem; color: var(--c-text-muted);
}
.lang-switch a { color: var(--c-text-muted); padding: 0 4px; font-weight: 500; }
.lang-switch a.active { color: var(--c-accent); font-weight: 600; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--c-text);
  margin: 4px 0; transition: transform .2s, opacity .2s;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start;
    gap: 0; padding: var(--space-md) var(--space-lg);
    background: var(--c-bg); border-bottom: 1px solid var(--c-border);
    transform: translateY(-100%); opacity: 0; pointer-events: none;
    transition: transform .25s, opacity .25s;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { padding: var(--space-sm) 0; width: 100%; }
  .lang-switch { margin-left: 0; padding-left: 0; border-left: none; padding-top: var(--space-sm); }
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius);
  font-weight: 500; font-size: 0.95rem;
  border: 1px solid transparent; cursor: pointer;
  transition: all .15s; text-decoration: none;
}
.btn-primary {
  background: var(--c-accent); color: #fff; border-color: var(--c-accent);
}
.btn-primary:hover { background: var(--c-accent-hover); border-color: var(--c-accent-hover); color: #fff; }
.btn-outline {
  background: transparent; color: var(--c-text); border-color: var(--c-border);
}
.btn-outline:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ============ Sections / Spacing ============ */
.section { padding: var(--space-3xl) 0; }
.section-tight { padding: var(--space-2xl) 0; }
.section-alt { background: var(--c-surface); }
.section-title { text-align: center; margin-bottom: var(--space-xl); }
.section-title h2 { margin-bottom: var(--space-sm); }
.section-title p { color: var(--c-text-muted); max-width: 620px; margin: 0 auto; }

/* ============ Hero ============ */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--c-border);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.15fr 1fr;
    gap: var(--space-3xl);
  }
}
.hero-content { max-width: 600px; }
.hero h1 {
  margin: var(--space-md) 0 var(--space-md);
  font-weight: 700;
}
.hero-tagline {
  font-size: 1.25rem; color: var(--c-text-muted);
  margin-bottom: var(--space-xl); max-width: 600px;
}
.hero-cta { display: flex; gap: var(--space-md); flex-wrap: wrap; }

.hero-illustration {
  display: none;
  width: 100%;
}
@media (min-width: 900px) {
  .hero-illustration { display: block; }
}
.hero-illustration svg {
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto;
  display: block;
}

/* ============ Pillars ============ */
.pillars {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-xl);
}
.pillar h3 { margin-bottom: var(--space-sm); }
.pillar p { color: var(--c-text-muted); font-size: 0.95rem; }

/* ============ Tech Stack ============ */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  max-width: 960px;
  margin: 0 auto var(--space-xl);
}
@media (min-width: 540px) {
  .tech-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 760px) {
  .tech-grid { grid-template-columns: repeat(8, 1fr); }
}
.tech-item {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; padding: var(--space-sm) 4px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  min-height: 90px;
  min-width: 0;
  overflow: hidden;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.tech-item:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.tech-item img {
  width: 40px; height: 40px;
  object-fit: contain;
  flex-shrink: 0;
}
.tech-item span {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--c-text);
  text-align: center;
  line-height: 1.2;
  word-break: break-word;
}
.tech-detail {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  font-size: 0.92rem;
  color: var(--c-text-muted);
  line-height: 1.9;
}
.tech-detail p { margin-bottom: 4px; }
.tech-detail strong { color: var(--c-text); margin-right: 4px; }

/* ============ Services ============ */
.services-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}
.service-card {
  padding: var(--space-xl) var(--space-lg);
  border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  background: var(--c-bg);
  transition: border-color .15s, transform .15s;
}
.service-card:hover { border-color: var(--c-accent); transform: translateY(-2px); }
.service-card h3 { margin-bottom: var(--space-sm); }
.service-short { color: var(--c-text-muted); font-size: 0.95rem; margin-bottom: var(--space-md); }
.service-bullets { list-style: none; margin: var(--space-md) 0; }
.service-bullets li {
  padding: 6px 0 6px 22px; font-size: 0.92rem; color: var(--c-text); position: relative;
}
.service-bullets li::before {
  content: '→'; position: absolute; left: 0; color: var(--c-accent); font-weight: bold;
}
.service-applied { font-size: 0.85rem; margin-top: var(--space-md); padding-top: var(--space-md); border-top: 1px solid var(--c-border); }
.service-icon {
  width: 40px; height: 40px; border-radius: var(--radius);
  background: var(--c-accent-soft); margin-bottom: var(--space-md);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: var(--c-accent); font-size: 1.1rem;
}
.service-icon[data-icon="datasphere"]::before { content: '◇'; }
.service-icon[data-icon="webi"]::before { content: '⊞'; }
.service-icon[data-icon="powerbi"]::before { content: '◐'; }
.service-icon[data-icon="etl"]::before { content: '⇄'; }

/* ============ Clients ============ */
.client-strip {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md); align-items: center;
  padding: var(--space-lg) 0;
}
.client-strip .client-logo {
  height: 60px; display: flex; align-items: center; justify-content: center;
  filter: grayscale(100%) opacity(0.65);
  transition: filter .2s;
}
.client-strip .client-logo:hover { filter: grayscale(0%) opacity(1); }
.client-strip .client-logo img { max-height: 40px; max-width: 100%; }
.client-strip .client-logo.no-logo {
  font-weight: 600; color: var(--c-text-muted); font-size: 0.95rem;
  border: 1px solid var(--c-border); border-radius: var(--radius); padding: 12px 8px;
}
.client-strip .client-logo.no-logo::before { content: attr(data-label); }

.clients-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-lg);
}
@media (min-width: 720px) {
  .clients-grid { grid-template-columns: repeat(2, 1fr); }
}
.client-card {
  display: grid; grid-template-columns: 100px 1fr;
  gap: var(--space-lg); padding: var(--space-lg);
  border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  background: var(--c-bg);
}
.client-card .client-logo {
  height: 60px; display: flex; align-items: center; justify-content: center;
  filter: grayscale(100%) opacity(0.85);
}
.client-card .client-logo img { max-height: 50px; max-width: 100%; }
.client-card .client-logo.no-logo {
  font-weight: 600; color: var(--c-text-muted); font-size: 0.85rem;
  text-align: center; line-height: 1.2;
}
.client-card .client-logo.no-logo::before { content: attr(data-label); }
.client-name {
  font-size: 1.1rem; margin-bottom: 4px;
  display: flex; align-items: center; gap: 8px;
}
.client-country {
  font-size: 0.7rem; padding: 2px 6px; border-radius: 3px;
  background: var(--c-accent-soft); color: var(--c-accent); font-weight: 600;
}
.client-project { margin-bottom: 4px; font-size: 0.95rem; }
.client-role { font-size: 0.85rem; margin-bottom: var(--space-sm); }
.client-desc { font-size: 0.92rem; color: var(--c-text); }

/* ============ About ============ */
.about-bio {
  max-width: var(--max-w-narrow);
  margin: 0 auto var(--space-2xl);
  font-size: 1.08rem; line-height: 1.75;
}
.about-bio p { margin-bottom: var(--space-md); }

.timeline { max-width: var(--max-w-narrow); margin: 0 auto; }
.timeline-item {
  display: grid; grid-template-columns: 180px 1fr;
  gap: var(--space-lg); padding: var(--space-md) 0;
  border-bottom: 1px solid var(--c-border);
}
.timeline-item:last-child { border-bottom: none; }
.timeline-period { color: var(--c-text-muted); font-size: 0.9rem; font-family: var(--f-mono); }
.timeline-role h4 { font-size: 1.05rem; margin-bottom: 2px; }
.timeline-role .company { color: var(--c-accent); font-weight: 500; }

@media (max-width: 600px) {
  .timeline-item { grid-template-columns: 1fr; gap: 4px; }
}

.cert-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-sm); max-width: var(--max-w-narrow); margin: 0 auto;
}
.cert-item {
  padding: var(--space-sm) var(--space-md);
  background: var(--c-surface); border-radius: var(--radius);
  font-size: 0.9rem;
}
.cert-name { font-weight: 500; }
.cert-meta { color: var(--c-text-muted); font-size: 0.82rem; margin-top: 2px; }

/* ============ Contact form ============ */
.contact-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-2xl);
  max-width: var(--max-w-narrow); margin: 0 auto;
}
@media (min-width: 720px) {
  .contact-grid { grid-template-columns: 2fr 1fr; }
}
.form-field { margin-bottom: var(--space-md); }
.form-field label {
  display: block; margin-bottom: 6px;
  font-size: 0.9rem; font-weight: 500; color: var(--c-text);
}
.form-field input, .form-field textarea {
  width: 100%; padding: 12px 14px;
  font: inherit; color: var(--c-text);
  background: var(--c-bg);
  border: 1px solid var(--c-border); border-radius: var(--radius);
  transition: border-color .15s;
}
.form-field input:focus, .form-field textarea:focus {
  outline: none; border-color: var(--c-accent);
}
.form-field textarea { min-height: 140px; resize: vertical; font-family: var(--f-sans); }

.contact-info dt {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--c-text-muted); margin-top: var(--space-md);
}
.contact-info dd { font-size: 0.95rem; margin-top: 2px; }
.contact-info dd:first-of-type { margin-top: 0; }

/* ============ Blog ============ */
.post-list { max-width: var(--max-w-narrow); margin: 0 auto; }
.post-item {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--c-border);
}
.post-item:last-child { border-bottom: none; }
.post-item h3 { margin-bottom: 4px; }
.post-item h3 a { color: var(--c-text); }
.post-item h3 a:hover { color: var(--c-accent); }
.post-meta { color: var(--c-text-muted); font-size: 0.85rem; margin-bottom: var(--space-sm); }
.post-excerpt { color: var(--c-text); font-size: 0.95rem; }

.post-article {
  max-width: var(--max-w-narrow); margin: 0 auto; padding: var(--space-2xl) var(--space-lg);
}
.post-article h1 { margin-bottom: var(--space-sm); }
.post-article .post-meta { margin-bottom: var(--space-xl); }
.post-content { font-size: 1.05rem; line-height: 1.75; }
.post-content p { margin-bottom: var(--space-md); }
.post-content h2 { margin-top: var(--space-xl); }
.post-content h3 { margin-top: var(--space-lg); }
.post-content code {
  font-family: var(--f-mono); font-size: 0.9em;
  background: var(--c-surface); padding: 2px 6px; border-radius: 4px;
}
.post-content pre {
  background: var(--c-text); color: #f5f5f5;
  padding: var(--space-md); border-radius: var(--radius);
  overflow-x: auto; margin: var(--space-md) 0;
}
.post-content pre code { background: none; color: inherit; padding: 0; }
.post-content blockquote {
  border-left: 3px solid var(--c-accent);
  padding-left: var(--space-md); color: var(--c-text-muted);
  margin: var(--space-md) 0;
}

/* ============ CTA Banner ============ */
.cta-banner {
  text-align: center; padding: var(--space-2xl) var(--space-lg);
  background: var(--c-accent-soft); border-radius: var(--radius-lg);
  margin: var(--space-2xl) 0;
}
.cta-banner h3 { margin-bottom: var(--space-sm); font-size: 1.4rem; }
.cta-banner p { color: var(--c-text-muted); margin-bottom: var(--space-md); }

/* ============ Footer ============ */
.site-footer {
  margin-top: var(--space-3xl);
  border-top: 1px solid var(--c-border);
  padding: var(--space-xl) 0 var(--space-md);
  background: var(--c-surface);
}
.footer-inner {
  display: flex; flex-wrap: wrap; gap: var(--space-lg);
  justify-content: space-between; align-items: flex-start;
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--c-border);
}
.footer-brand { display: flex; flex-direction: column; gap: 4px; }
.footer-links { display: flex; flex-direction: column; gap: 6px; align-items: flex-end; font-size: 0.92rem; }
.footer-links a { color: var(--c-text-muted); }
.footer-links a:hover { color: var(--c-accent); }
.copyright { padding-top: var(--space-md); color: var(--c-text-muted); }

@media (max-width: 600px) {
  .footer-inner { flex-direction: column; }
  .footer-links { align-items: flex-start; }
}

/* ============ Utilities ============ */
.text-center { text-align: center; }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }