/* --- DESIGN TOKENS (CSS Custom Properties) --- */
    :root {
      --color-primary-dark: #000D65;
      --color-accent-blue: #2540F0;
      --color-text-dark: #0F172A;
      --color-text-muted: #334155;
      --color-bg-light: #F8FAFC;
      --color-bg-white: #FFFFFF;
      --color-border: #E2E8F0;
      --color-border-dark: #1E293B;
      
      --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      
      /* Fluid Typography Scale */
      --font-size-h1: clamp(2.25rem, 5vw + 1rem, 3.5rem);
      --font-size-h2: clamp(1.75rem, 3vw + 1rem, 2.5rem);
      --font-size-h3: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
      --font-size-body: 1rem;
      --font-size-lead: 1.125rem;
      --font-size-micro: 0.875rem;
      
      /* Spacing Scale */
      --space-xs: 0.5rem;
      --space-sm: 1rem;
      --space-md: 1.5rem;
      --space-lg: 2.5rem;
      --space-xl: clamp(4rem, 8vw, 8rem); /* Generous vertical rhythm */
      
      --radius: 4px; /* Sharp, technical feel per DESIGN.md */
      --transition-speed: 200ms;
      --transition-ease: cubic-bezier(0.16, 1, 0.3, 1);
      --container-width: 1200px;
      --header-height: 80px;
    }

    /* --- BASE RESET & STYLES --- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: var(--font-stack);
      font-size: 16px;
      color: var(--color-text-dark);
      background-color: var(--color-bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* Skip Link for Accessibility */
    .skip-link {
      position: absolute;
      top: -100px;
      left: 0;
      background: var(--color-accent-blue);
      color: var(--color-bg-white);
      padding: var(--space-sm) var(--space-md);
      z-index: 9999;
      text-decoration: none;
      font-weight: 600;
      border-radius: 0 0 var(--radius) 0;
      transition: top var(--transition-speed) ease;
    }

    .skip-link:focus {
      top: 0;
    }

    /* Section Scroll Margin for Sticky Header */
    section {
      scroll-margin-top: var(--header-height);
    }

    /* --- TYPOGRAPHY --- */
    h1, h2, h3, h4 {
      color: var(--color-primary-dark);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: var(--font-size-h1);
      font-weight: 800;
    }

    h2 {
      font-size: var(--font-size-h2);
      letter-spacing: -0.01em;
      margin-bottom: var(--space-md);
    }

    h3 {
      font-size: var(--font-size-h3);
      font-weight: 600;
      margin-bottom: var(--space-xs);
    }

    p {
      font-size: var(--font-size-body);
      color: var(--color-text-muted);
      margin-bottom: var(--space-md);
    }

    .lead {
      font-size: var(--font-size-lead);
      line-height: 1.6;
      color: var(--color-text-muted);
    }

    .micro-label {
      font-size: var(--font-size-micro);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-accent-blue);
      display: inline-block;
      margin-bottom: var(--space-sm);
    }

    /* --- LAYOUT UTILITIES --- */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: var(--space-md);
      padding-right: var(--space-md);
    }

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

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

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

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

    .bg-dark p {
      opacity: 0.9;
    }

    /* --- SIGNATURE DETAIL: Technical Grid & Indicators --- */
    .tech-grid-bg {
      background-image: linear-gradient(var(--color-border) 1px, transparent 1px),
                        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
      background-size: 40px 40px;
      background-position: center;
    }

    .tech-indicator {
      font-family: monospace;
      font-size: 0.75rem;
      color: var(--color-accent-blue);
      border: 1px solid var(--color-accent-blue);
      padding: 2px 6px;
      border-radius: 2px;
      display: inline-block;
      margin-bottom: var(--space-sm);
    }

    /* --- COMPONENT: BUTTONS --- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.875rem 1.75rem;
      font-size: var(--font-size-micro);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      text-decoration: none;
      border-radius: var(--radius);
      transition: all var(--transition-speed) var(--transition-ease);
      cursor: pointer;
      border: 1px solid transparent;
    }

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

    .btn--primary:hover {
      background-color: #1a33cc;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(37, 64, 240, 0.2);
    }

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

    .btn--secondary:hover {
      background-color: rgba(37, 64, 240, 0.05);
      transform: translateY(-2px);
    }

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

    .btn--white-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      transform: translateY(-2px);
    }

    .btn:active {
      transform: translateY(0);
    }

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

    /* --- STICKY HEADER --- */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      height: var(--header-height);
      background-color: rgba(248, 250, 252, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-border);
      transition: background-color var(--transition-speed) ease;
    }

    .header__container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .header__logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--color-primary-dark);
      text-decoration: none;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      transition: outline var(--transition-speed) ease;
    }

    .header__logo:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 4px;
    }

    .header__logo-dot {
      width: 8px;
      height: 8px;
      background-color: var(--color-accent-blue);
      display: inline-block;
    }

    .header__nav {
      display: none;
    }

    .header__nav-list {
      display: flex;
      list-style: none;
      gap: var(--space-lg);
    }

    .header__nav-link {
      font-size: var(--font-size-micro);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-dark);
      text-decoration: none;
      transition: color var(--transition-speed) ease;
    }

    .header__nav-link:hover {
      color: var(--color-accent-blue);
    }

    .header__nav-link:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 4px;
      color: var(--color-accent-blue);
    }

    .header__cta {
      display: none;
    }

    /* Mobile Menu Toggle Button */
    .header__toggle {
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      z-index: 1001;
    }

    .header__toggle:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 4px;
    }

    .header__toggle-bar {
      width: 100%;
      height: 2px;
      background-color: var(--color-primary-dark);
      transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease;
    }

    /* Mobile Navigation Drawer */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background-color: var(--color-bg-white);
      z-index: 999;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      padding: var(--space-lg);
      transform: translateY(-100%);
      transition: transform var(--transition-speed) var(--transition-ease);
    }

    .mobile-menu--open {
      transform: translateY(0);
    }

    .mobile-menu__list {
      list-style: none;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: var(--space-lg);
      margin-bottom: var(--space-lg);
    }

    .mobile-menu__link {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--color-primary-dark);
      text-decoration: none;
      transition: color var(--transition-speed) ease;
    }

    .mobile-menu__link:hover {
      color: var(--color-accent-blue);
    }

    .mobile-menu__link:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 4px;
      color: var(--color-accent-blue);
    }

    /* Active State for Mobile Toggle */
    .header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }
    .header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(2) {
      opacity: 0;
    }
    .header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }

    /* --- HERO SECTION --- */
    .hero {
      position: relative;
      overflow: hidden;
      padding-top: calc(var(--header-height) + var(--space-lg));
      padding-bottom: var(--space-xl);
    }

    .hero__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
      align-items: center;
    }

    .hero__content {
      max-width: 600px;
    }

    .hero__headline {
      margin-top: var(--space-xs);
      margin-bottom: var(--space-md);
    }

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

    .hero__image-wrapper {
      position: relative;
      border: 1px solid var(--color-border);
      padding: var(--space-xs);
      background-color: var(--color-bg-white);
    }

    .hero__image {
      width: 100%;
      height: auto;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      display: block;
    }

    /* --- SERVICES SECTION --- */
    .services__header {
      max-width: 700px;
      margin-bottom: var(--space-lg);
    }

    .services__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .services__card {
      background-color: var(--color-bg-white);
      border: 1px solid var(--color-border);
      border-radius: var(--radius);
      padding: var(--space-md);
      transition: transform var(--transition-speed) var(--transition-ease),
                  box-shadow var(--transition-speed) var(--transition-ease);
      display: flex;
      flex-direction: column;
    }

    .services__card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px rgba(15, 23, 42, 0.05);
    }

    .services__card-image-wrapper {
      width: 100%;
      aspect-ratio: 4 / 3;
      overflow: hidden;
      margin-bottom: var(--space-md);
      border-radius: calc(var(--radius) - 2px);
    }

    .services__card-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform var(--transition-speed) var(--transition-ease);
    }

    .services__card:hover .services__card-image {
      transform: scale(1.03);
    }

    .services__card-title {
      font-size: 1.25rem;
      margin-bottom: var(--space-xs);
    }

    .services__card-text {
      font-size: 0.95rem;
      flex-grow: 1;
      margin-bottom: var(--space-md);
    }

    /* --- PROCESS (Der Ansatz) SECTION --- */
    .process__header {
      max-width: 700px;
      margin-bottom: var(--space-lg);
    }

    .process__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-md);
    }

    .process__step {
      background-color: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--color-border-dark);
      padding: var(--space-md);
      border-radius: var(--radius);
      position: relative;
    }

    .process__step-num {
      font-family: monospace;
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--color-accent-blue);
      line-height: 1;
      margin-bottom: var(--space-xs);
    }

    /* --- ABOUT SECTION --- */
    .about__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
      align-items: center;
    }

    .about__image-wrapper {
      position: relative;
      border: 1px solid var(--color-border);
      padding: var(--space-xs);
      background-color: var(--color-bg-white);
    }

    .about__image {
      width: 100%;
      height: auto;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      display: block;
    }

    .about__content {
      max-width: 600px;
    }

    .about__quote {
      border-left: 3px solid var(--color-accent-blue);
      padding-left: var(--space-md);
      margin: var(--space-md) 0;
      font-style: italic;
      color: var(--color-text-dark);
    }

    /* --- HOURS SECTION --- */
    .hours__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .hours__card {
      background-color: var(--color-bg-white);
      border: 1px solid var(--color-border);
      padding: var(--space-lg);
      border-radius: var(--radius);
    }

    .hours__list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: var(--space-sm);
    }

    .hours__row {
      display: flex;
      justify-content: space-between;
      border-bottom: 1px solid var(--color-border);
      padding-bottom: var(--space-xs);
    }

    .hours__day {
      font-weight: 600;
      color: var(--color-text-dark);
    }

    .hours__time {
      color: var(--color-text-muted);
    }

    /* --- CONTACT SECTION --- */
    .contact__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .contact__info {
      max-width: 500px;
    }

    .contact__details {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: var(--space-md);
      margin-top: var(--space-lg);
    }

    .contact__detail-item {
      display: flex;
      align-items: flex-start;
      gap: var(--space-sm);
    }

    .contact__icon {
      flex-shrink: 0;
      color: var(--color-accent-blue);
    }

    .contact__detail-text {
      font-size: 1rem;
      color: var(--color-text-muted);
    }

    .contact__detail-text strong {
      display: block;
      color: var(--color-text-dark);
    }

    .contact__link {
      color: var(--color-text-muted);
      text-decoration: none;
      transition: color var(--transition-speed) ease;
    }

    .contact__link:hover {
      color: var(--color-accent-blue);
    }

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

    .contact__form-wrapper {
      background-color: var(--color-bg-white);
      border: 1px solid var(--color-border);
      padding: var(--space-lg);
      border-radius: var(--radius);
    }

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

    .form-group label {
      display: block;
      font-size: var(--font-size-micro);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-dark);
      margin-bottom: var(--space-xs);
    }

    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      font-family: var(--font-stack);
      font-size: 1rem;
      color: var(--color-text-dark);
      background-color: var(--color-bg-light);
      border: 1px solid var(--color-border);
      border-radius: var(--radius);
      transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--color-accent-blue);
      box-shadow: 0 0 0 3px rgba(37, 64, 240, 0.1);
    }

    textarea.form-control {
      resize: vertical;
    }

    /* Honeypot Field */
    .hidden-field {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      border: 0;
    }

    /* Form Status & Success Styling */
    .form-status--error {
      color: #dc2626;
      font-size: var(--font-size-micro);
      margin-top: var(--space-sm);
      display: block;
    }

    .form-success {
      background-color: rgba(37, 64, 240, 0.05);
      border: 1px solid var(--color-accent-blue);
      padding: var(--space-lg);
      border-radius: var(--radius);
      text-align: center;
    }

    .form-success h3 {
      color: var(--color-accent-blue);
      margin-bottom: var(--space-sm);
    }

    /* --- FAQ SECTION --- */
    .faq__header {
      max-width: 700px;
      margin-bottom: var(--space-lg);
    }

    .faq__list {
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
      display: flex;
      flex-direction: column;
      gap: var(--space-sm);
    }

    .faq__item {
      background-color: var(--color-bg-white);
      border: 1px solid var(--color-border);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .faq__summary {
      padding: var(--space-md);
      font-weight: 600;
      color: var(--color-text-dark);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      transition: background-color var(--transition-speed) ease;
    }

    .faq__summary::-webkit-details-marker {
      display: none;
    }

    .faq__summary:hover {
      background-color: rgba(37, 64, 240, 0.02);
    }

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

    .faq__icon {
      width: 18px;
      height: 18px;
      transition: transform var(--transition-speed) ease;
      color: var(--color-accent-blue);
      flex-shrink: 0;
    }

    .faq__item[open] .faq__icon {
      transform: rotate(180deg);
    }

    .faq__content {
      padding: 0 var(--space-md) var(--space-md) var(--space-md);
      border-top: 1px solid var(--color-border);
      padding-top: var(--space-md);
    }

    /* --- FOOTER --- */
    .footer {
      background-color: var(--color-primary-dark);
      color: var(--color-bg-white);
      border-top: 1px solid var(--color-border-dark);
    }

    .footer__grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .footer__brand {
      max-width: 320px;
    }

    .footer__logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--color-bg-white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      margin-bottom: var(--space-sm);
    }

    .footer__logo:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 4px;
    }

    .footer__logo-dot {
      width: 8px;
      height: 8px;
      background-color: var(--color-accent-blue);
    }

    .footer__text {
      font-size: var(--font-size-micro);
      opacity: 0.8;
    }

    .footer__links-title {
      font-size: var(--font-size-micro);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: var(--space-md);
      color: var(--color-bg-white);
    }

    .footer__links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: var(--space-xs);
    }

    .footer__link {
      font-size: var(--font-size-micro);
      color: var(--color-bg-white);
      opacity: 0.8;
      text-decoration: none;
      transition: opacity var(--transition-speed) ease, color var(--transition-speed) ease;
    }

    .footer__link:hover {
      opacity: 1;
      color: var(--color-accent-blue);
    }

    .footer__link:focus-visible {
      outline: 2px solid var(--color-accent-blue);
      outline-offset: 2px;
      opacity: 1;
    }

    .footer__bottom {
      border-top: 1px solid var(--color-border-dark);
      margin-top: var(--space-lg);
      padding-top: var(--space-md);
      display: flex;
      flex-direction: column;
      gap: var(--space-sm);
      font-size: var(--font-size-micro);
      opacity: 0.6;
    }

    /* --- RESPONSIVE MEDIA QUERIES --- */
    @media (min-width: 640px) {
      .services__grid {
        grid-template-columns: repeat(2, 1fr);
      }
      
      .process__grid {
        grid-template-columns: repeat(2, 1fr);
      }

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

    @media (min-width: 1024px) {
      .header__nav {
        display: block;
      }

      .header__cta {
        display: block;
      }

      .header__toggle {
        display: none;
      }

      .hero__grid {
        grid-template-columns: 1.2fr 0.8fr;
        gap: var(--space-xl);
      }

      .hero__image-wrapper {
        transform: rotate(1deg);
      }

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

      .process__grid {
        grid-template-columns: repeat(4, 1fr);
      }

      .about__grid {
        grid-template-columns: 0.9fr 1.1fr;
        gap: var(--space-xl);
      }

      .contact__grid {
        grid-template-columns: 0.8fr 1.2fr;
        gap: var(--space-xl);
      }

      .footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
      }

      .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
      }
    }

    /* --- ANIMATION / MOTION --- */
    @media (prefers-reduced-motion: no-preference) {
      .reveal {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s var(--transition-ease), transform 0.6s var(--transition-ease);
      }

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