:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #14171b;
  --muted: #5b636e;
  --line: #e1e5ea;
  --accent: #1f5f8b;
  --accent-2: #2f9e8f;
  --accent-ink: #ffffff;
  --accent-soft: #e6eff6;
  --glow-1: #8fc3ea;
  --glow-2: #9fe0d4;
  --glow-3: #c9d6ff;
  --shadow: 0 1px 2px rgb(16 24 40 / .04), 0 8px 24px rgb(16 24 40 / .06);
  --shadow-lift: 0 2px 4px rgb(16 24 40 / .05), 0 18px 40px rgb(31 95 139 / .16);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1014;
    --surface: #151a20;
    --ink: #e9ecf0;
    --muted: #9aa3ae;
    --line: #262d35;
    --accent: #6fb3e6;
    --accent-2: #5fd3bf;
    --accent-ink: #0d1014;
    --accent-soft: #182836;
    --glow-1: #1d4e75;
    --glow-2: #145a52;
    --glow-3: #2a2f6b;
    --shadow: 0 1px 2px rgb(0 0 0 / .3);
    --shadow-lift: 0 18px 40px rgb(0 0 0 / .45), 0 0 0 1px rgb(111 179 230 / .25);
  }
}

/* Show only the chosen language. Elements without a lang attribute show in both. */
html[data-lang="en"] [lang="de"],
html[data-lang="de"] [lang="en"] { display: none !important; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 20px; }

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* Reading progress along the top */
.progress {
  position: fixed; top: 0; left: 0; z-index: 20; height: 3px; width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform-origin: 0 50%; transform: scaleX(var(--p, 0));
}

/* Soft moving colour behind the hero */
.glow { position: absolute; inset: 0 0 auto 0; height: 760px; overflow: hidden; pointer-events: none; z-index: -1; }
.glow span {
  position: absolute; border-radius: 50%; filter: blur(70px); opacity: .55;
  animation: drift 18s ease-in-out infinite alternate;
}
.glow span:nth-child(1) { width: 420px; height: 420px; background: var(--glow-1); top: -120px; right: 8%; }
.glow span:nth-child(2) { width: 340px; height: 340px; background: var(--glow-2); top: 160px; right: 30%; animation-duration: 22s; animation-delay: -6s; }
.glow span:nth-child(3) { width: 300px; height: 300px; background: var(--glow-3); top: 40px; left: -80px; animation-duration: 26s; animation-delay: -12s; }
@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(-60px, 40px) scale(1.12); }
  100% { transform: translate(40px, -30px) scale(.94); }
}

/* Header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.top-inner { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-ink);
  font-weight: 800; font-size: 14px; letter-spacing: .5px; text-decoration: none;
  transition: transform .3s cubic-bezier(.2, .9, .3, 1.4);
}
.brand:hover { transform: rotate(-8deg) scale(1.08); }
nav { display: flex; gap: 22px; margin-left: auto; }
nav a { position: relative; color: var(--muted); text-decoration: none; font-size: 15px; padding: 4px 0; }
nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; border-radius: 2px;
  background: var(--accent); transform: scaleX(0); transition: transform .25s ease;
}
nav a:hover, nav a.active { color: var(--ink); }
nav a:hover::after, nav a.active::after { transform: scaleX(1); }
.lang-switch { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; background: var(--surface); }
.lang-switch button {
  font: inherit; font-size: 13px; font-weight: 700; letter-spacing: .5px;
  border: 0; background: none; color: var(--muted);
  padding: 4px 12px; border-radius: 999px; cursor: pointer; min-height: 30px;
  transition: background .25s, color .25s;
}
.lang-switch button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }

@media (max-width: 680px) {
  nav { display: none; }
  .lang-switch { margin-left: auto; }
}

/* Hero */
section.hero { position: relative; padding-top: 84px; padding-bottom: 24px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 14px; padding: 5px 12px 5px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 70%, transparent); border: 1px solid var(--line);
  color: var(--muted); font-size: 13px; font-weight: 600; letter-spacing: .6px; text-transform: uppercase;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #2fbf71; box-shadow: 0 0 0 0 rgb(47 191 113 / .6); animation: ping 2s infinite; }
@keyframes ping {
  0%   { box-shadow: 0 0 0 0 rgb(47 191 113 / .55); }
  80%, 100% { box-shadow: 0 0 0 9px rgb(47 191 113 / 0); }
}
h1 { margin: 0; font-size: clamp(42px, 8vw, 72px); line-height: 1.02; letter-spacing: -1.5px; font-weight: 800; }
.role { margin: 12px 0 0; min-height: 1.4em; font-size: clamp(19px, 2.8vw, 24px); font-weight: 650; color: var(--accent); }
.typed.typing::after {
  content: ""; display: inline-block; width: 2px; height: 1.05em; margin-left: 3px; vertical-align: -3px;
  background: currentColor; animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.lead { max-width: 640px; margin: 20px 0 0; font-size: 18px; color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; min-height: 48px; padding: 0 22px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface); color: var(--ink);
  font-weight: 650; text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: var(--shadow-lift); }
.btn.primary { background: linear-gradient(100deg, var(--accent), var(--accent-2)); border-color: transparent; color: var(--accent-ink); }
.btn.primary::after {
  content: ""; position: absolute; inset: 0; transform: translateX(-120%);
  background: linear-gradient(100deg, transparent 30%, rgb(255 255 255 / .35) 50%, transparent 70%);
  animation: shine 4.5s ease-in-out 1.5s infinite;
}
@keyframes shine { 0% { transform: translateX(-120%); } 30%, 100% { transform: translateX(120%); } }

/* Stats */
.stats {
  list-style: none; margin: 44px 0 0; padding: 0;
  display: grid; gap: 14px; grid-template-columns: repeat(4, 1fr);
}
.stat {
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px 16px; box-shadow: var(--shadow);
}
.num {
  display: block; font-size: clamp(40px, 6vw, 56px); line-height: 1; font-weight: 800; letter-spacing: -1px;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.num i { font-style: normal; }
.label { display: block; margin-top: 8px; color: var(--muted); font-size: 14px; line-height: 1.4; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* Sections */
section.wrap { padding-top: 56px; padding-bottom: 16px; }
h2 {
  display: flex; align-items: center; gap: 12px;
  font-size: 13px; letter-spacing: 2.2px; text-transform: uppercase; color: var(--accent); margin: 0 0 16px;
}
h2::after { content: ""; height: 1px; flex: 1; background: linear-gradient(90deg, var(--line), transparent); }
.section-note { margin: 0 0 24px; color: var(--muted); max-width: 640px; }

/* Project cards */
.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column; box-shadow: var(--shadow);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0); transform-origin: 0 50%; transition: transform .45s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lift); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.card:hover::before { transform: scaleX(1); }
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.card h3 { margin: 0; font-size: 22px; }
.tag { font-size: 12px; font-weight: 700; color: var(--accent); background: var(--accent-soft); padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.card p { margin: 12px 0 0; }
.card > ul:not(.stack) { margin: 14px 0 0; padding-left: 18px; color: var(--muted); font-size: 15px; }
.card > ul:not(.stack) li { margin: 6px 0; }
.card .stack { margin-top: auto; padding-top: 18px; }

/* Tech chips */
.stack { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 0; padding: 0; }
.stack li {
  font-size: 12.5px; font-weight: 600; color: var(--ink);
  padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg);
  transition: border-color .2s, color .2s, transform .2s;
}
.stack li:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* Experience timeline */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline > li {
  position: relative; display: grid; grid-template-columns: 150px 1fr; gap: 28px;
  padding: 0 0 30px;
}
.timeline > li::before {          /* the line */
  content: ""; position: absolute; left: 164px; top: 12px; bottom: -6px; width: 2px;
  background: linear-gradient(var(--line), var(--line));
}
.timeline > li:last-child::before { bottom: 30px; }
.timeline > li::after {           /* the dot */
  content: ""; position: absolute; left: 159px; top: 7px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--accent);
}
.timeline > li.now::after { background: var(--accent); animation: pulse 2.2s infinite; }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  80%, 100% { box-shadow: 0 0 0 10px transparent; }
}
.when { color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; padding-top: 2px; text-align: right; }
.what { padding-left: 14px; }
.what h3 { margin: 0; font-size: 19px; color: var(--accent); }
.org { color: var(--ink); font-weight: 600; }
.what p { margin: 6px 0 0; }
.what .muted { color: var(--muted); font-style: italic; }
.what > ul:not(.stack) { margin: 8px 0 0; padding-left: 18px; }
.what > ul:not(.stack) li { margin: 4px 0; }

@media (max-width: 680px) {
  .timeline > li { grid-template-columns: 1fr; gap: 2px; padding-left: 26px; }
  .timeline > li::before { left: 5px; }
  .timeline > li::after { left: 0; }
  .when { text-align: left; }
  .what { padding-left: 0; }
}

.sub-h { font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); margin: 26px 0 10px; }
.edu { list-style: none; margin: 0; padding: 0; }
.edu li { display: grid; grid-template-columns: 150px 1fr; gap: 42px; padding: 7px 0; }
.edu .when { padding-top: 0; }
@media (max-width: 680px) { .edu li { grid-template-columns: 1fr; gap: 0; } .edu .when { text-align: left; } }

/* Skills */
.skills { margin: 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.skills > div {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.skills > div:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }
.skills dt { font-weight: 700; color: var(--accent); font-size: 14px; letter-spacing: .3px; }
.skills dd { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

/* Contact */
section.contact { padding-bottom: 64px; }
.contact p { font-size: 20px; max-width: 620px; margin: 0 0 16px; }
.mail {
  display: inline-block; font-size: clamp(22px, 4.6vw, 34px); font-weight: 800; text-decoration: none; word-break: break-all;
  background: linear-gradient(100deg, var(--accent), var(--accent-2), var(--accent));
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  transition: background-position .6s ease;
}
.mail:hover { background-position: 100% 0; }

.foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding-top: 22px; padding-bottom: 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

/* Scroll reveal. Only hidden when script.js is running, so the page works without JS. */
html.js .reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.2, .8, .2, 1);
  transition-delay: calc(var(--d, 0) * 80ms);
}
html.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.js .reveal { opacity: 1; transform: none; }
}