:root {
  --color-bg: #0F1B2D;
  --color-bg-elevated: #16273E;
  --color-border: #2A3C56;
  --color-text-primary: #F2F3F5;
  --color-text-secondary: #B3BECC;
  --color-text-muted: #7C8898;
  --color-accent: #5FA8D6;
  --color-accent-soft: #1B2E45;
  --color-focus: #5FA8D6;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --fs-h1: clamp(2.25rem, 5vw + 1rem, 3.75rem);
  --fs-h2: clamp(1.5rem, 2vw + 1rem, 2rem);
  --fs-h3: 1.125rem;
  --fs-body: 1.0625rem;
  --fs-small: 0.9375rem;
  --fs-micro: 0.8125rem;

  --lh-tight: 1.15;
  --lh-normal: 1.6;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 7rem;

  --content-max-width: 46rem;
  --wide-max-width: 64rem;
  --radius: 6px;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  overflow-y: scroll;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ul, ol, dl { margin: 0; }
ul, ol { padding: 0; list-style: none; }

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -100px;
  background: var(--color-accent);
  color: #0F1B2D;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-3);
}

.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--wide {
  max-width: var(--wide-max-width);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
}

.site-logo:hover {
  color: var(--color-accent);
}

.site-logo__image {
  width: 2.5rem;
  height: 2.5rem;
}

.site-nav ul {
  display: flex;
  gap: var(--space-5);
}

.site-nav a {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover {
  color: var(--color-text-primary);
}

.site-nav a[aria-current="page"] {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
}

/* Language Toggle */
.lang-toggle {
  display: inline-flex;
  gap: 4px;
  background-color: var(--color-accent-soft);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px;
}

.lang-toggle__btn {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 0.5em 0.8em;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 2.5rem;
  text-align: center;
}

.lang-toggle__btn:hover {
  color: var(--color-text-primary);
}

.lang-toggle__btn[aria-pressed="true"] {
  background-color: var(--color-accent);
  color: #0F1B2D;
  font-weight: 600;
}

/* Hero */
.hero {
  padding-block: var(--space-8) var(--space-6);
}

.hero__name {
  font-size: var(--fs-h1);
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
}

.fact-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-text-secondary);
  padding-bottom: var(--space-5);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.fact-list li {
  display: flex;
  align-items: baseline;
  gap: 0.4em;
}

.fact-list li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

.hero__summary {
  max-width: 38rem;
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.linkedin-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1px;
}

.linkedin-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.linkedin-link svg {
  width: 0.8em;
  height: 0.8em;
  opacity: 0.7;
}

/* Page Intro */
.page-intro {
  padding-block: var(--space-7) var(--space-6);
}

.page-intro h1 {
  font-size: var(--fs-h2);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

.page-intro p {
  color: var(--color-text-secondary);
  max-width: 38rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--space-4);
  padding-bottom: var(--space-8);
}

.card {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.card__media {
  aspect-ratio: 16 / 10;
  background-color: var(--color-accent-soft);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card--book .card__media {
  aspect-ratio: 3 / 4;
  max-width: 10rem;
}

.card__media-placeholder {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-accent);
  text-align: center;
  padding: var(--space-2);
}

.card__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}

.card__title {
  font-size: var(--fs-h3);
  font-weight: 600;
  letter-spacing: -0.005em;
}

.card__platform {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.card__description {
  color: var(--color-text-secondary);
  font-size: var(--fs-small);
  flex-grow: 1;
}

.card__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-1);
  border-top: 1px solid var(--color-border);
}

.card__links a {
  font-size: var(--fs-small);
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
}

.card__links a:hover {
  border-bottom-color: var(--color-accent);
}

/* Legal */
.legal {
  padding-block: var(--space-7) var(--space-8);
}

.legal h1 {
  font-size: var(--fs-h2);
  font-weight: 600;
  margin-bottom: var(--space-5);
}

.legal h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.legal p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.legal a {
  color: var(--color-accent);
}

.legal .note {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.legal .lang-block + .lang-block {
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.legal .stand {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  margin-bottom: var(--space-5);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  padding-block: var(--space-4);
  display: flex;
  gap: var(--space-4);
}

.site-footer a {
  font-size: var(--fs-micro);
  color: var(--color-text-muted);
}

.site-footer a:hover {
  color: var(--color-text-secondary);
}

/* Language Switching – MUST BE LAST */
[data-lang-content="en"] {
  display: none !important;
}

html[data-active-lang="en"] [data-lang-content="de"] {
  display: none !important;
}

html[data-active-lang="en"] [data-lang-content="en"] {
  display: inline !important;
}

html[data-active-lang="en"] li[data-lang-content="en"],
html[data-active-lang="en"] .fact-list [data-lang-content="en"] {
  display: list-item !important;
}

/* Responsive */
@media (max-width: 40rem) {
  .hero {
    padding-block: var(--space-6) var(--space-5);
  }
  .site-nav ul {
    gap: var(--space-3);
  }
  .site-header__right {
    gap: var(--space-3);
  }
  .card--book .card__media {
    max-width: 8rem;
  }
  .site-logo__image {
    width: 2rem;
    height: 2rem;
  }
}