/* Wacek Warszawa — personal consulting site */
/* Design tokens, light/dark via prefers-color-scheme */

:root {
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --surface: #ffffff;
  --text: #16202e;
  --text-muted: #5b6b80;
  --border: #e3e9f1;
  --accent: #0a66c2;
  --accent-strong: #084f96;
  --accent-soft: rgba(10, 102, 194, 0.08);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 6px 24px -6px rgba(16, 24, 40, 0.12);
  --shadow-lg: 0 20px 50px -12px rgba(16, 24, 40, 0.22);
  --radius: 14px;
  --radius-sm: 9px;
  --gradient: linear-gradient(120deg, #0a66c2 0%, #084f96 55%, #0b3d74 100%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1420;
    --bg-alt: #111a2a;
    --surface: #16203348;
    --text: #e7edf5;
    --text-muted: #9fb0c5;
    --border: #24334a;
    --accent: #4d9fe8;
    --accent-strong: #7ab8f0;
    --accent-soft: rgba(77, 159, 232, 0.12);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 24px -6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.65);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ---------- Header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }

.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover {
  color: var(--text);
  background: var(--accent-soft);
  text-decoration: none;
}

.nav-links .nav-cta {
  background: var(--accent);
  color: #fff;
  margin-left: 8px;
}
.nav-links .nav-cta:hover { background: var(--accent-strong); color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.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 {
  background: var(--gradient);
  color: #fff;
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 85% 10%, rgba(255,255,255,0.14), transparent 60%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; max-width: 760px; }

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.85;
  margin: 0 0 14px;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
  font-weight: 800;
}

.hero-sub {
  font-size: 1.18rem;
  line-height: 1.6;
  opacity: 0.94;
  margin: 0 0 34px;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.hero-proof {
  font-size: 0.95rem;
  font-weight: 500;
  opacity: 0.9;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-proof::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.25);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1rem;
  padding: 13px 24px;
  border-radius: 999px;
  border: 0;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  text-decoration: none !important;
}

.btn-primary {
  background: #fff;
  color: var(--accent-strong);
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

#contact .btn-primary,
.btn-lg {
  background: var(--accent);
  color: #fff;
  padding: 16px 32px;
  font-size: 1.06rem;
}
#contact .btn-primary:hover { background: var(--accent-strong); }

/* ---------- Sections ---------- */

.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  letter-spacing: -0.025em;
  margin: 0 0 18px;
  font-weight: 800;
}

.section-intro {
  color: var(--text-muted);
  font-size: 1.08rem;
  max-width: 640px;
  margin: 0 0 42px;
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p { margin: 0 0 20px; font-size: 1.06rem; }
.about-text p:last-child { margin-bottom: 0; }

.about-facts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.fact {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}

.fact-number {
  display: block;
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1.1;
}

.fact-label {
  display: block;
  color: var(--text-muted);
  font-size: 0.93rem;
  margin-top: 4px;
}

/* ---------- Timeline ---------- */

.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item { position: relative; padding-bottom: 44px; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-alt);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-content h3 {
  margin: 0 0 4px;
  font-size: 1.22rem;
  letter-spacing: -0.015em;
}

.timeline-role {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
  margin: 0 0 12px;
}

.timeline-content p { margin: 0; color: var(--text-muted); max-width: 680px; }

.capability-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
  max-width: 680px;
}
.capability-list li { margin-bottom: 7px; }

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s, box-shadow 0.18s;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-featured { border-top: 4px solid var(--accent); }

.service-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.service-card h3 {
  margin: 0 0 14px;
  font-size: 1.28rem;
  letter-spacing: -0.015em;
}

.service-card p {
  color: var(--text-muted);
  font-size: 0.97rem;
  margin: 0 0 14px;
}

.service-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: auto 0 0;
  padding-top: 10px;
}

.service-tags li {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
}

/* ---------- Contact ---------- */

.contact-inner { text-align: center; max-width: 660px; margin: 0 auto; }

.contact-text {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0 auto 34px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 44px 0 36px;
  text-align: center;
}

.footer-inner p { margin: 0 0 6px; }
.footer-sub { color: var(--text-muted); font-size: 0.94rem; }
.footer-copy { color: var(--text-muted); font-size: 0.85rem; margin-top: 14px; }

/* ---------- Mobile ---------- */

@media (max-width: 860px) {
  .services-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-facts { flex-direction: row; flex-wrap: wrap; }
  .fact { flex: 1 1 160px; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px 18px;
    gap: 2px;
    display: none;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .nav-links .nav-cta { margin-left: 0; margin-top: 8px; text-align: center; }

  .hero { padding: 64px 0 60px; }
  .section { padding: 60px 0; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}