/* ============================================================
   Digital Business Card — style.css
   Theme: Black & Red with high contrast
   ============================================================ */

/* ── Fonts (lokal) ────────────────────────────────────────── */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('../assets/fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('../assets/fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ── Custom Properties ───────────────────────────────────── */
:root {
  --color-bg:          #0A0A0A;
  --color-surface:     #111111;
  --color-surface-2:   #1A1A1A;
  --color-border:      #2A2A2A;
  --color-red:         #CC0000;
  --color-red-bright:  #FF1A1A;
  --color-red-glow:    rgba(204, 0, 0, 0.25);
  --color-text:        #F0F0F0;
  --color-text-muted:  #888888;
  --color-text-faint:  #555555;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  32px;
  --radius-full: 9999px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 24px var(--color-red-glow);

  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;

  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ── Layout ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Skip Link (Accessibility) ───────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-red);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* ── Decorative Background ───────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(204, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(204, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ── Main Content ────────────────────────────────────────── */
main {
  position: relative;
  z-index: 1;
  padding: 3rem 0 4rem;
}

/* ── Card Base ───────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-red), transparent);
  opacity: 0.8;
}

/* ── Hero Section ────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 3rem 2rem;
  margin-bottom: 2rem;
}

.profile-image-wrapper {
  display: inline-block;
  position: relative;
  margin-bottom: 1.5rem;
}

.profile-image {
  width: 280px;
  height: 280px;
  border-radius: var(--radius-full);
  border: 3px solid var(--color-border);
  object-fit: cover;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.profile-image-wrapper::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  background: linear-gradient(135deg, var(--color-red), transparent, var(--color-red)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  transition: opacity var(--transition-normal);
}

.profile-image-wrapper:hover::after {
  opacity: 1;
}

.profile-image-wrapper:hover .profile-image {
  box-shadow: var(--shadow-glow);
  border-color: var(--color-red);
}

.hero-name {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
  color: var(--color-text);
}

.hero-title {
  font-size: 0.85rem;
  color: var(--color-red);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.company-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: inherit;
  transition: opacity var(--transition-fast);
}

.company-link:hover {
  opacity: 0.75;
}

.company-logo {
  display: inline-block;
  height: 18px;
  width: auto;
  vertical-align: middle;
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

/* ── Section Base ────────────────────────────────────────── */
section {
  margin-bottom: 2rem;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-red);
  margin-bottom: 1.25rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-border), transparent);
}

/* ── About Section ───────────────────────────────────────── */
.about-text {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.75;
}

/* ── Social Links Section ────────────────────────────────── */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.1rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition:
    background var(--transition-normal),
    border-color var(--transition-normal),
    color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.social-link:hover,
.social-link:focus-visible {
  background: var(--color-surface);
  border-color: var(--color-red);
  color: var(--color-text);
  box-shadow: 0 0 12px var(--color-red-glow);
  transform: translateY(-2px);
  outline: none;
}

.social-link:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 3px;
}

.social-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: color var(--transition-normal);
}

.social-link:hover svg {
  color: var(--color-red);
}

/* ── References Section ──────────────────────────────────── */
.references-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.reference-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition:
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.reference-card:hover {
  border-color: var(--color-red);
  box-shadow: 0 4px 16px var(--color-red-glow);
  transform: translateY(-2px);
}

.reference-quote {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
  font-style: italic;
}

.reference-quote::before {
  content: '"';
  color: var(--color-red);
  font-size: 1.4em;
  font-style: normal;
  line-height: 0;
  vertical-align: -0.3em;
  margin-right: 0.2em;
}

.reference-author {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.reference-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

.reference-role {
  font-size: 0.8rem;
  color: var(--color-text-faint);
}

/* ── Certificates Section ────────────────────────────────── */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.certificate-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.1rem 1.25rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
  text-decoration: none;
}

.certificate-card:hover,
.certificate-card:focus-visible {
  border-color: var(--color-red);
  box-shadow: 0 4px 16px var(--color-red-glow);
  transform: translateY(-2px);
  outline: none;
}

.certificate-card:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 3px;
}

.certificate-badge-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.certificate-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 45px;
  height: 45px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.certificate-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.3;
}

.certificate-issuer {
  font-size: 0.78rem;
  color: var(--color-text-faint);
}

.certificate-arrow {
  margin-top: auto;
  align-self: flex-end;
  font-size: 0.75rem;
  color: var(--color-red);
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity var(--transition-normal),
    transform var(--transition-normal);
}

.certificate-card:hover .certificate-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--color-text-faint);
  font-size: 0.8rem;
  border-top: 1px solid var(--color-border);
}

footer a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--color-red);
}

.footer-disclaimer {
  margin-top: 0.5rem;
  font-size: 0.7rem;
  color: var(--color-text-faint);
  opacity: 0.6;
}

.impressum {
  margin-top: 1.5rem;
  font-size: 0.75rem;
  color: var(--color-text-faint);
  text-align: left;
  max-width: 320px;
  margin-inline: auto;
}

.impressum summary {
  cursor: pointer;
  text-align: center;
  color: var(--color-text-muted);
  list-style: none;
  margin-bottom: 0.75rem;
}

.impressum summary::-webkit-details-marker { display: none; }

.impressum summary::after {
  content: ' ↓';
}

details[open].impressum summary::after {
  content: ' ↑';
}

.impressum address {
  font-style: normal;
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
}

.impressum a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.impressum a:hover {
  color: var(--color-red);
}

/* ── Scroll Animations ───────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  .card {
    padding: 1.5rem;
    border-radius: var(--radius-md);
  }

  .hero {
    padding: 2rem 1rem;
  }

  .social-links {
    flex-direction: column;
  }

  .social-link {
    justify-content: center;
  }

  .references-grid,
  .certificates-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Reduced Motion ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}