/* ---------- Tokens ---------- */
/* Palette sampled from the MB logo: bright sky-blue #2CA6DA fading to
   deep blue #1072B5. --accent carries the interactive color (buttons,
   links); --accent-light is the brighter top-of-gradient tone used for
   small highlights (eyebrow text, "expert" chips). */
:root {
  --bg: #f6f9fb;
  --bg-alt: #ecf2f7;
  --ink: #142330;
  --ink-soft: #526270;
  --accent: #1072b5;
  --accent-light: #2ca6da;
  --accent-ink: #ffffff;
  --line: #dde5ec;
  --card-bg: #ffffff;
  --expert: #1072b5;
  --pro: #6b7885;
  --adv: #aab6c0;
  --radius: 14px;
  --font-display: "Source Sans Pro", "Source Sans 3", system-ui, sans-serif;
  --font-body: "Source Sans Pro", "Source Sans 3", system-ui, sans-serif;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1821;
    --bg-alt: #16212b;
    --ink: #eef3f8;
    --ink-soft: #a9b8c4;
    --accent: #4db8ea;
    --accent-light: #7fd0f2;
    --line: #26333f;
    --card-bg: #16212b;
    --expert: #4db8ea;
    --pro: #93a2ae;
    --adv: #46525d;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .logo { font-family: var(--font-display); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-light), var(--accent));
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.logo-img {
  height: 34px;
  width: auto;
  display: block;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--ink); }

.nav-cta {
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink) !important;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  margin-left: auto;
  margin-right: 20px;
}

.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  padding: 5px 11px;
  border-radius: 999px;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-btn.active {
  background: var(--accent);
  color: var(--accent-ink);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  display: block;
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 24px 72px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.12;
  font-weight: 900;
  margin: 0 0 24px;
  max-width: 18ch;
}

.hero-lede {
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: 1.1rem;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  margin: 0;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.hero-stats dt {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}
.hero-stats dd {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ---------- Section heading ---------- */
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 32px;
}
.section-number {
  font-family: var(--font-display);
  color: var(--accent);
  font-weight: 600;
}
.section-heading h2 {
  font-size: 1.8rem;
  margin: 0;
}
.section-intro {
  color: var(--ink-soft);
  max-width: 68ch;
  margin: -16px 0 36px;
}

section { padding: 64px 24px; }
#about, #skills { background: var(--bg-alt); border-radius: 28px; margin: 0 16px; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
}
.about-text p { color: var(--ink-soft); margin-top: 0; }
.about-facts { display: flex; flex-direction: column; gap: 22px; }
.fact-block h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin: 0 0 6px;
}
.fact-block p, .fact-block ul { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.fact-block ul { padding-left: 18px; }
.fact-block li { margin-bottom: 4px; }

/* ---------- Work ---------- */
.case-list { display: flex; flex-direction: column; gap: 24px; }

.case-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.case-visual {
  background:
    repeating-linear-gradient(45deg, var(--bg-alt) 0 10px, var(--card-bg) 10px 20px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  color: var(--ink-soft);
  font-size: 0.8rem;
  min-height: 160px;
}

.case-body { padding: 24px 24px 24px 0; }

.case-tag {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 8px;
}

.case-body h3 { margin: 0 0 10px; font-size: 1.25rem; }
.case-summary { color: var(--ink-soft); margin: 0 0 16px; }

.case-toggle {
  background: none;
  border: none;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.case-toggle .toggle-icon { display: inline-block; transition: transform 0.2s ease; }
.case-toggle[aria-expanded="true"] .toggle-icon { transform: rotate(45deg); }

.case-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 28px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease, padding 0.3s ease;
  margin-top: 0;
  padding-top: 0;
  border-top-color: transparent;
}
.case-details.open {
  max-height: 900px;
  opacity: 1;
  margin-top: 20px;
  padding-top: 20px;
  border-top-color: var(--line);
}
.case-details h4 {
  margin: 0 0 6px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}
.case-details p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}
.skill-group h3 { font-size: 1rem; margin: 0 0 14px; }
.chip-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--line);
  background: var(--card-bg);
}
.chip-expert { border-color: var(--expert); color: var(--expert); }
.chip-pro { color: var(--ink); }
.chip-adv { color: var(--ink-soft); }
.chip-legend { margin-top: 28px; color: var(--ink-soft); font-size: 0.85rem; }
.chip-legend .chip { padding: 0 4px; border: none; background: none; font-size: 0.7rem; }
.chip-legend .chip-expert { color: var(--expert); }
.chip-legend .chip-pro { color: var(--pro); }
.chip-legend .chip-adv { color: var(--adv); }

/* ---------- Contact ---------- */
.contact { text-align: center; padding: 96px 24px 120px; }
.contact-lede {
  max-width: 56ch;
  margin: 0 auto 36px;
  color: var(--ink-soft);
  font-size: 1.05rem;
}
.contact .section-heading { justify-content: center; }
.contact-links { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .case-card { grid-template-columns: 1fr; }
  .case-visual { min-height: 100px; }
  .case-body { padding: 20px; }
  .case-details { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 20px 24px 28px;
    gap: 18px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .hero { padding-top: 56px; }
  #about, #skills { margin: 0 8px; border-radius: 20px; }
}