/* ==========================================================================
   Wulf-Jürgen Kreppel Software-Entwicklung – Stylesheet
   ========================================================================== */

:root {
  --color-bg: #0f172a;
  --color-bg-alt: #111827;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f7fb;
  --color-text: #1f2937;
  --color-text-muted: #5b6472;
  --color-text-invert: #f8fafc;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #06b6d4;
  --color-border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
  --container-width: 1120px;
  --transition: 180ms ease;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-surface);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 0.75rem;
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3 { font-size: 1.25rem; }

p {
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

section {
  padding: 4.5rem 0;
}

.section-alt {
  background-color: var(--color-surface-alt);
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-header {
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.section-header.center {
  margin-inline: auto;
  text-align: center;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-invert);
  border-color: rgba(248, 250, 252, 0.4);
}

.btn-outline:hover {
  background-color: rgba(248, 250, 252, 0.12);
}

.btn-secondary {
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: #eef1f6;
}

.btn-block {
  width: 100%;
}

/* ---------- Header / Navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: #0f172a;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: #0f172a;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding-block: 0.35rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.nav-cta {
  display: flex;
  align-items: center;
}

/* ---------- Hero ---------- */

.hero {
  background: radial-gradient(circle at top right, #1e3a8a 0%, var(--color-bg) 55%, var(--color-bg-alt) 100%);
  color: var(--color-text-invert);
  padding: 5.5rem 0 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero p {
  color: rgba(248, 250, 252, 0.78);
  font-size: 1.05rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.hero-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(6px);
}

.hero-stat {
  display: flex;
  justify-content: space-between;
  padding-block: 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-stat:last-child {
  border-bottom: none;
}

.hero-stat strong {
  display: block;
  font-size: 1.4rem;
  color: #fff;
}

.hero-stat span {
  color: rgba(248, 250, 252, 0.7);
  font-size: 0.85rem;
}

.page-hero {
  background: linear-gradient(135deg, #1e3a8a, var(--color-bg));
  color: var(--color-text-invert);
  padding: 4rem 0 3.5rem;
  text-align: center;
}

.page-hero h1 {
  color: #fff;
}

.page-hero p {
  color: rgba(248, 250, 252, 0.8);
  max-width: 640px;
  margin-inline: auto;
}

/* ---------- Cards / Grids ---------- */

.grid {
  display: grid;
  gap: 1.75rem;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.9rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--color-text-muted);
}

.card ul li {
  margin-bottom: 0.35rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}

/* ---------- Process steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 1.75rem 1.25rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  margin-bottom: 0.9rem;
}

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

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 3rem;
  align-items: start;
}

.profile-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.profile-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 1.25rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  font-weight: 800;
}

.profile-meta {
  text-align: left;
  margin-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

.profile-meta dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-top: 0.9rem;
}

.profile-meta dd {
  margin: 0.15rem 0 0;
  font-weight: 600;
  color: var(--color-text);
}

.timeline {
  border-left: 2px solid var(--color-border);
  margin-left: 0.4rem;
  padding-left: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2.06rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.timeline-item time {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.contact-info-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.contact-info-list li {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}

.contact-info-list .icon {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

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

input,
textarea,
select {
  font: inherit;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  background: #fff;
}

textarea {
  resize: vertical;
  min-height: 140px;
}

.form-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

.form-status {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  display: none;
}

.form-status.visible {
  display: block;
}

.form-status.success {
  background: rgba(6, 182, 212, 0.1);
  color: #0e7490;
  border: 1px solid rgba(6, 182, 212, 0.25);
}

.form-status.error {
  background: rgba(220, 38, 38, 0.08);
  color: #b91c1c;
  border: 1px solid rgba(220, 38, 38, 0.25);
}

/* ---------- CTA band ---------- */

.cta-band {
  background: linear-gradient(120deg, var(--color-primary), #1e3a8a);
  color: #fff;
  border-radius: var(--radius);
  padding: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cta-band h2,
.cta-band p {
  color: #fff;
  margin: 0;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.85);
  margin-top: 0.5rem;
}

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

.site-footer {
  background: var(--color-bg);
  color: rgba(248, 250, 252, 0.75);
  padding: 3.5rem 0 1.75rem;
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(248, 250, 252, 0.12);
}

.site-footer h4 {
  color: #fff;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.site-footer p {
  color: rgba(248, 250, 252, 0.65);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: rgba(248, 250, 252, 0.7);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .hero-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem 1.5rem 1rem;
    display: none;
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-cta {
    display: none;
  }

  .grid-3,
  .grid-2,
  .values-grid,
  .steps,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .cta-band {
    flex-direction: column;
    text-align: center;
  }

  section {
    padding: 3rem 0;
  }
}