/* =========================================================
   Kernavis — style.css
   ========================================================= */

/* Google Fonts — Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* =========================================================
   CSS Custom Properties
   ========================================================= */
:root {
  --color-primary: #1f2937;
  --color-accent: #0f766e;
  --color-accent-dark: #0a5c56;
  --color-accent-light: #ccfbf1;
  --color-bg-main: #ffffff;
  --color-bg-section: #f9fafb;
  --color-text: #374151;
  --color-text-muted: #6b7280;
  --color-line: #e5e7eb;
  --color-card-shadow: rgba(31, 41, 55, 0.06);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --max-width: 1100px;
  --padding-desktop: 40px;
  --padding-mobile: 24px;
  --section-padding-desktop: 72px;
  --section-padding-mobile: 48px;

  --radius-card: 8px;
  --radius-btn: 6px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg-main);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-dark);
}

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

ul, ol {
  list-style: none;
}

/* =========================================================
   Typography
   ========================================================= */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  color: var(--color-primary);
  font-weight: 600;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 600;
}

h3 {
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 600;
}

p {
  max-width: 70ch;
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: #4b5563;
  font-weight: 400;
}

small, .small {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* =========================================================
   Layout Utilities
   ========================================================= */
.container {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--padding-desktop);
  padding-right: var(--padding-desktop);
}

.section {
  padding-top: var(--section-padding-desktop);
  padding-bottom: var(--section-padding-desktop);
}

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

.section__header {
  margin-bottom: 2.5rem;
}

.section__header h2 {
  margin-bottom: 0.75rem;
}

.section__intro {
  max-width: 65ch;
  font-size: 1rem;
  color: #4b5563;
  line-height: 1.65;
}

/* Grid helpers */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

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

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

/* =========================================================
   Header / Navigation
   ========================================================= */
.site-header {
  background-color: var(--color-bg-main);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.site-header__logo {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition);
}

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

/* Mobile toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-primary);
}

.menu-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.menu-toggle svg {
  display: block;
  width: 22px;
  height: 22px;
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-btn);
  padding: 14px 28px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  text-align: center;
  line-height: 1;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--secondary:hover {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 2rem;
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding-top: 80px;
  padding-bottom: 80px;
  background-color: var(--color-bg-main);
}

.hero--compact {
  padding-top: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-line);
}

.hero__title {
  max-width: 20ch;
  margin-bottom: 1.25rem;
}

.hero__subtitle {
  font-size: 1.125rem;
  line-height: 1.65;
  color: #4b5563;
  max-width: 58ch;
  font-weight: 400;
}

/* =========================================================
   Cards
   ========================================================= */
.card {
  background-color: var(--color-bg-main);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 1.5rem 1.75rem;
  box-shadow: 0 1px 4px var(--color-card-shadow);
}

.section--alt .card {
  background-color: var(--color-bg-main);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
}

.card p {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.65;
}

/* =========================================================
   Process Steps
   ========================================================= */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  position: relative;
}

.step {
  position: relative;
}

.step__number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 0.6rem;
  letter-spacing: -0.03em;
}

.step__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.step__text {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.6;
}

/* =========================================================
   Checkliste / Checklist
   ========================================================= */
.check-list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0;
}

.check-list li {
  padding: 0.6rem 0 0.6rem 1.75rem;
  position: relative;
  font-size: 0.9375rem;
  line-height: 1.55;
  border-bottom: 1px solid var(--color-line);
}

.check-list li:first-child {
  border-top: 1px solid var(--color-line);
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* =========================================================
   Two-column topics list
   ========================================================= */
.topic-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.topic-list li {
  padding: 0.5rem 0 0.5rem 1.25rem;
  position: relative;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.55;
  border-bottom: 1px solid var(--color-line);
}

.topic-list li:last-child {
  border-bottom: none;
}

.topic-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.85rem;
}

/* =========================================================
   Pricing / Orientierung
   ========================================================= */
.pricing-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.pricing-col {
  background-color: var(--color-bg-main);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: 0 1px 4px var(--color-card-shadow);
}

.section--alt .pricing-col {
  background-color: var(--color-bg-section);
  border-color: var(--color-line);
}

.pricing-col h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.pricing-col__range {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
  padding: 0.35rem 0.65rem;
  background-color: var(--color-accent-light);
  border-radius: 4px;
  display: inline-block;
}

.pricing-col__duration {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.pricing-col p {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.6;
}

.pricing-note {
  font-size: 0.9375rem;
  color: var(--color-text);
  max-width: 72ch;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-line);
}

/* =========================================================
   Phasen (vorgehen.html — Detaildarstellung)
   ========================================================= */
.phase {
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-line);
}

.phase:last-child {
  border-bottom: none;
}

.phase__header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1rem;
}

.phase__number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

.phase__title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-primary);
}

.phase__body {
  max-width: 72ch;
}

.phase__body p {
  margin-bottom: 1em;
}

.phase__body h4 {
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin: 1.25rem 0 0.5rem;
}

.phase__body ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1em;
}

.phase__body ul li {
  padding: 0.35rem 0 0.35rem 1.25rem;
  position: relative;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.phase__body ul li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.phase__result {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background-color: var(--color-accent-light);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 6px 6px 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-primary);
}

/* =========================================================
   Erfahrungsfelder (ueber.html)
   ========================================================= */
.experience-block {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--color-line);
}

.experience-block:last-child {
  border-bottom: none;
}

.experience-block__period {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 0.35rem;
}

.experience-block__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.experience-block__body {
  max-width: 70ch;
  font-size: 0.9375rem;
}

.experience-block__body p {
  margin-bottom: 0.75em;
}

.experience-block__body ul {
  list-style: none;
  padding: 0;
  margin: 0.5em 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.experience-block__body ul li {
  font-size: 0.8125rem;
  color: var(--color-text);
  background-color: var(--color-bg-section);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  padding: 0.25rem 0.65rem;
}

/* =========================================================
   Technische Schwerpunkte — Skills grid
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.skills-block h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-accent);
}

.skills-block ul {
  list-style: none;
  padding: 0;
}

.skills-block ul li {
  padding: 0.4rem 0 0.4rem 1.1rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.5;
  border-bottom: 1px solid var(--color-line);
}

.skills-block ul li:last-child {
  border-bottom: none;
}

.skills-block ul li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* =========================================================
   Ausbildung Tabelle
   ========================================================= */
.education-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.9375rem;
}

.education-table th {
  text-align: left;
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 1rem 0.5rem 0;
  border-bottom: 2px solid var(--color-line);
}

.education-table td {
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
  color: var(--color-text);
}

.education-table td:first-child {
  white-space: nowrap;
  font-weight: 500;
  color: var(--color-accent);
  font-size: 0.875rem;
  width: 160px;
}

/* =========================================================
   Kontakt-Layout
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-col h2 {
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.contact-info {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.contact-info li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.9375rem;
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
}

.contact-info li:first-child {
  border-top: 1px solid var(--color-line);
}

.contact-info__label {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  min-width: 70px;
}

/* =========================================================
   Legal / AGB pages
   ========================================================= */
.legal-content {
  max-width: 65ch;
}

.legal-content h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-line);
  color: var(--color-primary);
}

.legal-content h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.legal-content h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.4rem;
  color: var(--color-primary);
}

.legal-content p {
  margin-bottom: 0.75em;
  font-size: 0.9375rem;
  line-height: 1.65;
}

.legal-content ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin: 0.5rem 0 0.75rem;
}

.legal-content ul li {
  margin-bottom: 0.3rem;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.legal-content a {
  word-break: break-all;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background-color: var(--color-primary);
  color: #9ca3af;
  padding-top: 52px;
  padding-bottom: 32px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.site-footer__col h4 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 1rem;
}

.site-footer__col ul {
  list-style: none;
  padding: 0;
}

.site-footer__col ul li {
  margin-bottom: 0.5rem;
}

.site-footer__col a {
  color: #9ca3af;
  font-size: 0.9375rem;
  transition: color var(--transition);
}

.site-footer__col a:hover {
  color: #fff;
}

.site-footer__col p {
  font-size: 0.9375rem;
  color: #9ca3af;
  max-width: none;
  margin-bottom: 0.35rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.25rem;
  text-align: center;
  font-size: 0.8125rem;
  color: #6b7280;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

@media (max-width: 768px) {
  :root {
    --section-padding-desktop: var(--section-padding-mobile);
  }

  .container {
    padding-left: var(--padding-mobile);
    padding-right: var(--padding-mobile);
  }

  .section {
    padding-top: var(--section-padding-mobile);
    padding-bottom: var(--section-padding-mobile);
  }

  /* Nav mobile */
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    background-color: var(--color-bg-main);
    border-bottom: 1px solid var(--color-line);
    padding: 1rem var(--padding-mobile);
    z-index: 99;
  }

  .site-nav.is-open {
    display: flex;
  }

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

  .site-nav a:last-child {
    border-bottom: none;
  }

  /* Grids */
  .grid-4,
  .grid-3,
  .grid-2,
  .steps,
  .pricing-cols,
  .skills-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  /* Hero */
  .hero {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .hero__title {
    max-width: none;
  }

  .btn-group {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  /* Phase header */
  .phase__header {
    flex-direction: column;
    gap: 0.25rem;
  }

  /* Footer */
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  /* Table */
  .education-table td:first-child {
    width: auto;
  }
}