/* ============================================
   HOLSKI – Holsteinische Initiative für KI-Transfer
   Corporate Website Stylesheet
   ============================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,400&family=Source+Sans+3:wght@300;400;500;600&display=swap');

/* --- Variables --- */
:root {
  --color-primary: #1F5A6B;
  --color-primary-light: #2A7A8F;
  --color-primary-dark: #164450;
  --color-primary-faint: #E8F2F5;
  --color-text: #1A1A1A;
  --color-text-secondary: #555;
  --color-text-light: #777;
  --color-bg: #FFFFFF;
  --color-bg-warm: #FAFAF8;
  --color-bg-section: #F5F6F4;
  --color-border: #E0E0E0;
  --color-border-light: #EBEBEB;
  --color-accent: #C4A265;

  --font-serif: 'Source Serif 4', 'Georgia', serif;
  --font-sans: 'Source Sans 3', 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --max-width: 1080px;
  --max-width-narrow: 720px;
  --spacing-section: 100px;
  --spacing-section-mobile: 60px;

  --transition: 0.25s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: var(--color-primary-light);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

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

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

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

main {
  flex: 1;
}

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

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0;
}

.site-logo img {
  height: 38px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

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

.site-nav a:hover::after,
.site-nav a.active::after {
  width: 100%;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  padding: 80px 0 90px;
  position: relative;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero__label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  display: block;
}

.hero h1 {
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 520px;
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__visual img {
  max-width: 100%;
  opacity: 0.85;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 14px 32px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

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

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

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

/* --- Sections --- */
.section {
  padding: var(--spacing-section) 0;
}

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

.section--primary {
  background: var(--color-primary);
  color: #fff;
}

.section--primary h2,
.section--primary h3 {
  color: #fff;
}

.section--primary p {
  color: rgba(255,255,255,0.85);
}

.section__eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  display: block;
}

.section--primary .section__eyebrow {
  color: var(--color-accent);
}

.section__intro {
  max-width: 600px;
  margin-bottom: 3rem;
}

.section__intro p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 3px;
  background: var(--color-primary);
  margin: 2rem 0;
}

.divider--white {
  background: var(--color-accent);
}

/* --- Feature Cards / Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.feature-card {
  padding: 0;
}

.feature-card__number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- Steps (KI-Pathfinder) --- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.step__marker {
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.step h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.step p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- CTA Banner --- */
.cta-banner {
  text-align: center;
  padding: 60px 40px;
}

.cta-banner h2 {
  margin-bottom: 1rem;
}

.cta-banner p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.85);
  max-width: 540px;
  margin: 0 auto 2rem;
}

/* --- Förderhinweis --- */
.foerder-box {
  background: var(--color-bg-warm);
  border: 1px solid var(--color-border);
  padding: 48px;
  margin-top: 3rem;
}

.foerder-box__label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
  display: block;
}

.foerder-box p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

.foerder-box__logos {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.foerder-box__logos img {
  height: 100px;
  width: auto;
}

/* --- Contact --- */
.contact-info {
  max-width: 500px;
}

.contact-info dt {
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.25rem;
}

.contact-info dt:first-child {
  margin-top: 0;
}

.contact-info dd {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.contact-info dd a {
  color: var(--color-text-secondary);
}

.contact-info dd a:hover {
  color: var(--color-primary);
}

/* --- Legal pages --- */
.legal-content {
  max-width: var(--max-width-narrow);
}

.legal-content h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
}

.legal-content p,
.legal-content address {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-style: normal;
  line-height: 1.7;
}

/* --- Pathfinder illustration in text --- */
.pathfinder-illustration {
  margin: 2.5rem 0;
  padding: 0;
}

.pathfinder-illustration img {
  width: 100%;
  max-width: 680px;
  opacity: 0.9;
}

/* --- Two-column layout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding: 40px 0;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.8rem;
  color: var(--color-text-light);
  letter-spacing: 0.02em;
}

.footer-legal a:hover {
  color: var(--color-primary);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* --- Page Header (inner pages) --- */
.page-header {
  padding: 60px 0 50px;
  border-bottom: 1px solid var(--color-border-light);
}

.page-header h1 {
  font-size: 2rem;
}

.page-header p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin-top: 0.75rem;
}

/* --- Contact Form --- */
.contact-form {
  max-width: 100%;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-light);
}

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

.contact-form .btn {
  margin-top: 0.5rem;
}

.form-message {
  padding: 24px 28px;
  font-size: 1rem;
  line-height: 1.6;
}

.form-message--success {
  background: #EAF5EC;
  color: #1A5C2A;
  border: 1px solid #B8DCC2;
}

.form-message--error {
  background: #FDF0EF;
  color: #8C2020;
  border: 1px solid #E8B4B4;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  :root {
    --spacing-section: 70px;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  .container { padding: 0 24px; }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__visual {
    order: -1;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .two-col {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 640px) {
  :root {
    --spacing-section: 50px;
  }

  h1 { font-size: 1.65rem; }

  .site-header .container {
    height: 60px;
  }

  .site-logo img {
    height: 30px;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  }

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

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 50px 0 60px;
  }

  .step {
    grid-template-columns: 48px 1fr;
    gap: 16px;
  }

  .step__marker {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }

  .foerder-box {
    padding: 28px;
  }

  .site-footer .container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .cta-banner {
    padding: 40px 24px;
  }
}