/* ==========================================================================
   Design System — Custom Properties
   ========================================================================== */

:root {
  /* Colors — Dark Theme */
  --color-bg:                  #131313;
  --color-surface:             #131313;
  --color-surface-container:   #201f1f;
  --color-surface-low:         #1c1b1b;
  --color-surface-high:        #2a2a2a;
  --color-surface-highest:     #353534;
  --color-surface-bright:      #3a3939;

  --color-on-surface:          #e5e2e1;
  --color-on-surface-variant:  #c2c6d7;

  --color-primary:             #b2c5ff;
  --color-primary-container:   #5b8cff;
  --color-on-primary:          #002c72;

  --color-secondary-container: #2f4780;

  --color-outline:             #8c90a1;
  --color-outline-variant:     #424655;

  /* Gradients */
  --gradient-text:             linear-gradient(135deg, #b2c5ff 0%, #5b8cff 100%);
  --gradient-glow:             linear-gradient(135deg, rgba(178, 197, 255, 0.2) 0%, transparent 100%);

  /* Glass Card */
  --glass-bg:                  rgba(42, 42, 42, 0.4);
  --glass-border:              rgba(189, 203, 255, 0.05);
  --glass-blur:                20px;

  /* Typography — System Font Stack */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;

  --text-xs:   clamp(0.6875rem, 0.65rem + 0.1vw, 0.75rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.15vw, 0.875rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);
  --text-lg:   clamp(1.0625rem, 1rem + 0.3vw, 1.125rem);
  --text-xl:   clamp(1.1875rem, 1.1rem + 0.4vw, 1.25rem);
  --text-2xl:  clamp(1.375rem, 1.2rem + 0.75vw, 1.5rem);
  --text-3xl:  clamp(1.625rem, 1.3rem + 1.5vw, 1.875rem);
  --text-5xl:  clamp(2.25rem, 1.5rem + 3vw, 3rem);
  --text-6xl:  clamp(2.5rem, 1.5rem + 4vw, 3.75rem);
  --text-8xl:  clamp(3rem, 1.5rem + 6vw, 6rem);

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;
  --space-24:  6rem;
  --space-32:  8rem;
  --space-48:  12rem;

  /* Layout */
  --max-width: 80rem;
  --px:        var(--space-5);

  /* Shadows */
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --shadow-primary: 0 10px 15px -3px rgba(178, 197, 255, 0.1);
  --shadow-primary-lg: 0 25px 50px -12px rgba(178, 197, 255, 0.2);

  /* Borders */
  --radius-sm:   0.25rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   300ms ease;
  --transition-slow:   500ms ease;
}


/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-on-surface);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

::selection {
  background: rgba(178, 197, 255, 0.3);
  color: var(--color-primary);
}


/* ==========================================================================
   Utilities
   ========================================================================== */

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

@media (min-width: 480px) {
  :root {
    --px: var(--space-8);
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}


/* ==========================================================================
   Scroll Animations
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}


/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(19, 19, 19, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav--scrolled {
  background: rgba(19, 19, 19, 0.95);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-5);
}

.nav__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  color: var(--color-on-surface);
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-10);
}

.nav__link {
  color: rgba(229, 226, 225, 0.7);
  font-size: var(--text-sm);
  transition: color var(--transition-base);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-primary);
}

.nav__cta {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: opacity var(--transition-fast);
}

.nav__cta:hover {
  opacity: 0.9;
}

/* Hamburger */
.nav__toggle {
  position: relative;
  z-index: 101;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 5px;
}

.nav__toggle-bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-on-surface);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.nav__mobile {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(19, 19, 19, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav__mobile.is-open {
  opacity: 1;
  visibility: visible;
}

.nav__mobile-link {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-on-surface);
  transition: color var(--transition-base);
}

.nav__mobile-link:hover {
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }

  .nav__toggle {
    display: none;
  }
}

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.nav__cta:focus-visible,
.hero__cta:focus-visible,
.services__cta:focus-visible,
.contact__cta:focus-visible,
.about__linkedin:focus-visible {
  outline-offset: 3px;
  border-radius: var(--radius-full);
}

/* Scroll offset for fixed nav */
section[id] {
  scroll-margin-top: 5rem;
}


/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--space-32);
  padding-bottom: var(--space-16);
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  opacity: 0.08;
  pointer-events: none;
}

.hero__tag {
  display: inline-block;
  padding: 0.375rem var(--space-4);
  border-radius: var(--radius-full);
  background: rgba(47, 71, 128, 0.3);
  border: 1px solid rgba(178, 197, 255, 0.1);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-8);
}

.hero__title {
  font-size: var(--text-8xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.9;
  margin-bottom: var(--space-8);
}

.hero__subtitle {
  font-size: var(--text-2xl);
  color: var(--color-on-surface-variant);
  font-weight: 300;
  max-width: 40rem;
  line-height: 1.5;
  margin-bottom: var(--space-12);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-8);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  font-weight: 700;
  box-shadow: var(--shadow-primary);
  transition: transform var(--transition-base);
}

.hero__cta:hover {
  transform: scale(1.02);
}

.hero__cta-arrow {
  transition: transform var(--transition-base);
}

.hero__cta:hover .hero__cta-arrow {
  transform: translateX(0.25rem);
}

.hero__email {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 0.5rem;
  text-decoration-color: rgba(178, 197, 255, 0.3);
  transition: color var(--transition-base);
}

.hero__email:hover {
  color: var(--color-on-surface);
}

/* Trust Bar */
.hero__trust {
  margin-top: var(--space-24);
  padding-top: var(--space-12);
  border-top: 1px solid rgba(66, 70, 85, 0.1);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.hero__trust-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero__trust-label {
  font-size: var(--text-xs);
  color: rgba(178, 197, 255, 0.6);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.hero__trust-value {
  font-size: var(--text-sm);
  font-weight: 500;
}

@media (min-width: 640px) {
  .hero__actions {
    flex-direction: row;
    align-items: center;
  }
}

@media (min-width: 768px) {
  .hero {
    padding-top: var(--space-48);
    padding-bottom: var(--space-32);
  }

  .hero__trust {
    grid-template-columns: repeat(4, 1fr);
    margin-top: var(--space-32);
  }
}


/* ==========================================================================
   Clients Section
   ========================================================================== */

.clients {
  padding-block: var(--space-24);
  background: rgba(28, 27, 27, 0.5);
}

.clients__heading {
  text-align: center;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: rgba(194, 198, 215, 0.6);
  margin-bottom: var(--space-16);
}

.clients__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  justify-items: center;
  align-items: center;
  gap: var(--space-8) var(--space-6);
}

.clients__logo {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-on-surface);
  padding: var(--space-2) var(--space-3);
  opacity: 0.5;
  transition: opacity var(--transition-base);
}

.clients__logo:hover {
  opacity: 1;
}

/* When using <img> logos */
.clients__logo img {
  display: block;
  height: 1.25rem;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.clients__logo:hover img {
  opacity: 1;
}

@media (min-width: 768px) {
  .clients__grid {
    gap: var(--space-8) var(--space-16);
  }

  .clients__logo img {
    height: 2rem;
  }

  .clients__logo {
    font-size: var(--text-lg);
    padding: var(--space-2) var(--space-4);
  }
}


/* ==========================================================================
   Services Section
   ========================================================================== */

.services {
  padding-block: var(--space-24);
  background: var(--color-surface);
}

.services__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  margin-bottom: var(--space-16);
}

.services__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.services__title {
  font-size: var(--text-5xl);
  font-weight: 900;
  letter-spacing: -0.04em;
}

.services__intro {
  font-size: var(--text-lg);
  color: var(--color-on-surface-variant);
  max-width: 28rem;
}

.services__grid {
  display: grid;
  gap: var(--space-8);
}

/* Service Card */
.services__card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  transition: border-color var(--transition-slow);
}

.services__card:hover {
  border-color: rgba(178, 197, 255, 0.2);
}

.services__card-icon {
  width: 3rem;
  height: 3rem;
  background: rgba(178, 197, 255, 0.1);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-8);
  color: var(--color-primary);
  font-size: var(--text-2xl);
}

.services__card-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.services__card-text {
  color: var(--color-on-surface-variant);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.services__card-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.services__card-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: rgba(229, 226, 225, 0.7);
}

.services__card-check {
  color: var(--color-primary);
  font-size: var(--text-sm);
  flex-shrink: 0;
}

/* Services CTA */
.services__footer {
  text-align: center;
  margin-top: var(--space-12);
}

.services__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  font-weight: 700;
  box-shadow: var(--shadow-primary);
  transition: transform var(--transition-base);
}

.services__cta:hover {
  transform: scale(1.02);
}

.services__cta-arrow {
  transition: transform var(--transition-base);
}

.services__cta:hover .services__cta-arrow {
  transform: translateX(0.25rem);
}

@media (min-width: 768px) {
  .services {
    padding-block: var(--space-32);
  }

  .services__header {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--space-20);
  }

  .services__card {
    padding: var(--space-10);
  }

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

  .services__footer {
    margin-top: var(--space-16);
  }
}


/* ==========================================================================
   About Section
   ========================================================================== */

.about {
  padding-block: var(--space-24);
  background: var(--color-surface-low);
}

.about__grid {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

/* Photo */
.about__photo-wrapper {
  position: relative;
}

.about__photo-glow {
  position: absolute;
  inset: -1rem;
  background: var(--gradient-glow);
  filter: blur(2rem);
  opacity: 0.5;
  border-radius: var(--radius-2xl);
  transition: opacity var(--transition-slow);
}

.about__photo-wrapper:hover .about__photo-glow {
  opacity: 1;
}

.about__photo {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  max-height: 28rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-2xl);
}

@media (min-width: 1024px) {
  .about__photo {
    max-height: none;
  }
}

.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Text */
.about__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.about__title {
  font-size: var(--text-5xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-8);
}

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

.about__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  color: var(--color-on-surface-variant);
  font-size: var(--text-lg);
  line-height: 1.7;
  font-weight: 300;
}

.about__linkedin {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-weight: 700;
  border: none;
  margin-top: var(--space-12);
  box-shadow: var(--shadow-primary);
  transition: transform var(--transition-base);
}

.about__linkedin:hover {
  transform: scale(1.02);
}

.about__linkedin-icon {
  font-size: var(--text-xl);
}

@media (min-width: 768px) {
  .about {
    padding-block: var(--space-32);
  }
}

@media (min-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-20);
  }
}


/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
  position: relative;
  padding-block: var(--space-24);
  background: var(--color-surface);
  overflow: hidden;
  text-align: center;
}

.contact__glow {
  position: absolute;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}

.contact__glow--left {
  bottom: -12rem;
  left: -12rem;
  background: rgba(178, 197, 255, 0.1);
}

.contact__glow--right {
  top: -12rem;
  right: -12rem;
  background: rgba(47, 71, 128, 0.1);
}

.contact__inner {
  position: relative;
  z-index: 1;
  max-width: 48rem;
  margin-inline: auto;
}

.contact__title {
  font-size: var(--text-6xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-8);
}

.contact__subtitle {
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-on-surface-variant);
  margin-bottom: var(--space-16);
}

.contact__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  font-weight: 900;
  box-shadow: var(--shadow-primary-lg);
  transition: transform var(--transition-base);
}

.contact__cta:hover {
  transform: scale(1.05);
}

.contact__cta-arrow {
  transition: transform var(--transition-base);
}

.contact__cta:hover .contact__cta-arrow {
  transform: translateX(0.25rem);
}

.contact__divider {
  margin-top: var(--space-12);
}

.contact__divider-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  color: var(--color-on-surface-variant);
  margin-bottom: var(--space-4);
}

.contact__email {
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-on-surface);
  transition: color var(--transition-base);
}

.contact__email:hover {
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .contact {
    padding-block: var(--space-48);
  }

  .contact__title {
    font-size: var(--text-8xl);
  }

  .contact__subtitle {
    font-size: var(--text-3xl);
  }

  .contact__cta {
    gap: var(--space-4);
    padding: var(--space-5) var(--space-12);
    font-size: var(--text-2xl);
  }

  .contact__email {
    font-size: var(--text-3xl);
  }
}


/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background: var(--color-surface-low);
  padding-block: var(--space-12);
  font-size: var(--text-sm);
  color: rgba(229, 226, 225, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  text-align: center;
}

.footer__copy {
  color: rgba(229, 226, 225, 0.5);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4) var(--space-8);
}

.footer__link {
  color: rgba(229, 226, 225, 0.55);
  transition: color var(--transition-base);
  text-decoration-color: rgba(178, 197, 255, 0.4);
  text-underline-offset: 0.25rem;
}

.footer__link:hover {
  color: var(--color-on-surface);
  text-decoration: underline;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}


/* ==========================================================================
   Legal Pages (Impressum, Datenschutz)
   ========================================================================== */

.legal {
  padding-top: var(--space-32);
  padding-bottom: var(--space-24);
}

.legal__title {
  font-size: var(--text-5xl);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-12);
}

.legal h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}

.legal h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.legal p {
  color: var(--color-on-surface-variant);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  max-width: 48rem;
}

.legal strong {
  color: var(--color-on-surface);
  font-weight: 600;
}