/* =============================================
   NIKOLAUS KLEEMANN - Leadership Architect
   Design System & Global Styles
   ============================================= */

/* CSS Custom Properties */
:root {
  --color-primary: #202f45;
  --color-accent: #ff5a00;
  --color-white: #ffffff;
  --color-light: #f7f8fa;
  --color-gray-100: #f0f1f3;
  --color-gray-200: #e2e4e8;
  --color-gray-300: #c8ccd3;
  --color-gray-500: #6b7280;
  --color-gray-700: #374151;
  --color-dark: #1a2332;

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

  --fs-hero: clamp(2.5rem, 5vw, 4rem);
  --fs-h1: clamp(2rem, 4vw, 3rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: clamp(1.25rem, 2vw, 1.5rem);
  --fs-body: 1.0625rem;
  --fs-body-lg: 1.1875rem;
  --fs-small: 0.875rem;

  --lh-heading: 1.2;
  --lh-body: 1.7;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-text: 680px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(32, 47, 69, 0.08);
  --shadow-md: 0 4px 12px rgba(32, 47, 69, 0.1);
  --shadow-lg: 0 8px 30px rgba(32, 47, 69, 0.12);

  --transition: 0.3s ease;
}

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-primary);
  background-color: var(--color-white);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--lh-heading);
  color: var(--color-primary);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  margin-bottom: 1em;
}

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

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

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

/* =============================================
   HEADER & NAVIGATION
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

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

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.main-nav a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-gray-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition);
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

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

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* =============================================
   HERO SECTIONS
   ============================================= */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: calc(80px + var(--space-3xl)) 0 var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.hero--home {
  min-height: 100vh;
  background: var(--color-primary);
  color: var(--color-white);
}

.hero--home h1,
.hero--home h2,
.hero--home p {
  color: var(--color-white);
}

.hero--subpage {
  min-height: 60vh;
  background: var(--color-light);
}

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

.hero__headline {
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero__subline {
  font-size: var(--fs-body-lg);
  line-height: var(--lh-body);
  opacity: 0.85;
  margin-bottom: var(--space-lg);
  max-width: 600px;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-primary);
  font-size: var(--fs-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

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

.btn--primary:hover {
  background: #e65100;
  border-color: #e65100;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 90, 0, 0.3);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

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

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

.btn--outline-dark:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn--text {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  font-size: var(--fs-body);
}

.btn--text:hover {
  color: #e65100;
}

.btn--text::after {
  content: ' \2192';
  transition: transform var(--transition);
}

.btn--text:hover::after {
  transform: translateX(4px);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

/* =============================================
   SECTIONS
   ============================================= */
.section {
  padding: var(--space-3xl) 0;
}

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

.section--dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.section--dark h2,
.section--dark h3,
.section--dark p {
  color: var(--color-white);
}

.section__header {
  margin-bottom: var(--space-xl);
}

.section__headline {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-md);
}

.section__subline {
  font-size: var(--fs-body-lg);
  color: var(--color-gray-500);
  max-width: var(--max-width-text);
}

.section--dark .section__subline {
  color: rgba(255, 255, 255, 0.7);
}

/* =============================================
   CONTENT BLOCKS
   ============================================= */
.text-block {
  max-width: var(--max-width-text);
}

.text-block p {
  color: var(--color-gray-700);
  margin-bottom: 1.2em;
}

.section--dark .text-block p {
  color: rgba(255, 255, 255, 0.8);
}

.highlight-list {
  margin: var(--space-md) 0;
}

.highlight-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-gray-700);
}

.section--dark .highlight-list li {
  color: rgba(255, 255, 255, 0.8);
}

.highlight-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 2px;
  background: var(--color-accent);
}

/* =============================================
   CARDS
   ============================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--color-white);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card__label {
  display: inline-block;
  font-size: var(--fs-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.card__title {
  font-size: var(--fs-h3);
  margin-bottom: var(--space-sm);
}

.card__text {
  color: var(--color-gray-700);
  margin-bottom: var(--space-md);
}

/* =============================================
   5B FRAMEWORK
   ============================================= */
.framework-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.framework-item {
  padding: var(--space-lg);
  background: var(--color-white);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
  transition: all var(--transition);
}

.framework-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.framework-item__letter {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.framework-item__title {
  font-size: var(--fs-h3);
  margin-bottom: var(--space-xs);
}

.framework-item__text {
  font-size: var(--fs-small);
  color: var(--color-gray-500);
}

/* =============================================
   TESTIMONIALS
   ============================================= */
.testimonial {
  background: var(--color-white);
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  margin-bottom: var(--space-lg);
  position: relative;
}

.testimonial::before {
  content: '\201E';
  position: absolute;
  top: var(--space-md);
  left: var(--space-lg);
  font-size: 4rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.3;
}

.testimonial__quote {
  font-size: var(--fs-body-lg);
  font-style: italic;
  color: var(--color-gray-700);
  margin-bottom: var(--space-md);
  padding-top: var(--space-md);
}

.testimonial__author {
  font-weight: 600;
  color: var(--color-primary);
}

.testimonial__role {
  font-size: var(--fs-small);
  color: var(--color-gray-500);
}

/* =============================================
   LOGO GRID
   ============================================= */
.logo-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-lg) 0;
}

.logo-grid__item {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.logo-grid__item:hover {
  border-color: var(--color-accent);
  color: var(--color-primary);
}

/* =============================================
   CONTACT FORM
   ============================================= */
.form {
  max-width: 600px;
}

.form__group {
  margin-bottom: var(--space-md);
}

.form__label {
  display: block;
  font-size: var(--fs-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
  color: var(--color-primary);
}

.form__input,
.form__select,
.form__textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-primary);
  font-size: var(--fs-body);
  color: var(--color-primary);
  background: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 90, 0, 0.1);
}

.form__textarea {
  min-height: 150px;
  resize: vertical;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer__brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.footer__tagline {
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.5);
}

.footer__links {
  display: flex;
  gap: var(--space-md);
}

.footer__links a {
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: var(--fs-small);
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
}

.footer__social a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition);
}

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

/* =============================================
   CTA SECTION
   ============================================= */
.cta-section {
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  max-width: var(--max-width-text);
  margin: 0 auto var(--space-lg);
}

/* =============================================
   LEGAL PAGES
   ============================================= */
.legal-content {
  padding: calc(80px + var(--space-xl)) 0 var(--space-3xl);
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.legal-content h1 {
  margin-bottom: var(--space-lg);
}

.legal-content h2 {
  font-size: var(--fs-h3);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.legal-content p,
.legal-content li {
  color: var(--color-gray-700);
}

/* =============================================
   TWO COLUMN LAYOUT
   ============================================= */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.two-col--reverse {
  direction: rtl;
}

.two-col--reverse > * {
  direction: ltr;
}

/* =============================================
   DETAIL SECTIONS (Ansatz / Framework details)
   ============================================= */
.detail-block {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

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

.detail-block__label {
  display: inline-block;
  font-size: var(--fs-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

/* =============================================
   PODCAST EMBED
   ============================================= */
.podcast-embed {
  margin: var(--space-lg) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.podcast-embed iframe {
  width: 100%;
  border: none;
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.episode-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.episode-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.episode-card__date {
  font-size: var(--fs-small);
  color: var(--color-gray-500);
  white-space: nowrap;
}

.episode-card__title {
  font-weight: 600;
  font-size: var(--fs-small);
}

/* =============================================
   MINI CASES
   ============================================= */
.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.case-card__label {
  font-size: var(--fs-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.case-card__row {
  margin-bottom: var(--space-md);
}

.case-card__row-title {
  font-weight: 600;
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-500);
  margin-bottom: var(--space-xs);
}

/* =============================================
   ANIMATIONS
   ============================================= */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .two-col {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .main-nav.open {
    transform: translateX(0);
  }

  .main-nav a {
    font-size: 1.25rem;
  }

  .hero {
    min-height: 70vh;
    padding: calc(80px + var(--space-xl)) 0 var(--space-xl);
  }

  .hero--home {
    min-height: 90vh;
  }

  .hero__headline {
    font-size: clamp(2rem, 6vw, 3rem);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

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

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

  .footer-inner {
    flex-direction: column;
  }

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

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    text-align: center;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 64px;
  }

  .main-nav {
    top: 64px;
  }

  .logo-grid {
    gap: var(--space-md);
  }
}