/* ============================================================
   DigiAssist — IT-Sicherheitsberatung und KI-Governance
   Dark theme with teal accent (#0d9488)
   System fonts only (DSGVO compliant — no external font CDN)
   ============================================================ */

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

/* === DESIGN TOKENS === */
:root {
  /* Type Scale (fluid) */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing (4px system) */
  --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;

  /* Fonts — system stack only (DSGVO) */
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, Roboto, 'Helvetica Neue', sans-serif;
  --font-display: var(--font-body);
  --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', ui-monospace, monospace;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* === DARK THEME (default) === */
:root {
  --color-bg:             #0f1117;
  --color-surface:        #161821;
  --color-surface-2:      #1c1f2b;
  --color-surface-offset: #1a1d28;
  --color-border:         #2a2d3a;
  --color-divider:        #232632;

  /* Teal accent */
  --color-primary:        #0d9488;
  --color-primary-hover:  #0f766e;
  --color-primary-active: #115e59;
  --color-primary-light:  rgba(13, 148, 136, 0.12);
  --color-primary-glow:   rgba(13, 148, 136, 0.25);

  /* Text */
  --color-text:           #e4e5ea;
  --color-text-muted:     #9ca3af;
  --color-text-faint:     #6b7280;
  --color-text-inverse:   #0f1117;

  /* Semantic */
  --color-success:        #22c55e;
  --color-warning:        #f59e0b;
  --color-error:          #ef4444;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* === BODY === */
body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.2; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection {
  background: var(--color-primary-glow);
  color: var(--color-text);
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }

a, button, [role="button"], [role="link"], input, textarea, select {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

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

/* === SKIP LINK === */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: 200;
}
.skip-link:focus {
  top: var(--space-4);
}

/* === LAYOUT === */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: var(--space-6);
}

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

/* === HEADER / NAV === */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}
.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.logo__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}
.logo__text {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.2;
}
.logo__sub {
  display: block;
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.01em;
  text-transform: none;
  color: var(--color-text-muted);
}

/* Desktop Nav */
.nav { display: flex; align-items: center; gap: var(--space-6); }
.nav__links { display: flex; list-style: none; gap: var(--space-5); }
.nav__links a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-1) 0;
  position: relative;
}
.nav__links a:hover,
.nav__links a:focus { color: var(--color-text); }
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}
.nav__links a:hover::after { width: 100%; }

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-1);
  gap: 0;
}
.lang-toggle__btn {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  border: none;
  background: none;
  transition: all var(--transition-interactive);
}
.lang-toggle__btn.active {
  background: var(--color-primary);
  color: white;
}
.lang-toggle__btn:hover:not(.active) {
  color: var(--color-text);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  border-radius: var(--radius-md);
}
.nav-toggle:hover { background: var(--color-surface); }
.nav-toggle svg { width: 24px; height: 24px; }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 17, 23, 0.98);
  backdrop-filter: blur(20px);
  z-index: 150;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}
.mobile-nav.active { display: flex; }
.mobile-nav__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.mobile-nav a {
  color: var(--color-text);
  font-size: var(--text-xl);
  font-weight: 600;
  text-decoration: none;
}
.mobile-nav a:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav-toggle { display: flex; }
}

/* === HERO === */
.hero {
  padding-block: clamp(var(--space-16), 12vw, var(--space-32));
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -20%;
  width: 60%;
  height: 120%;
  background: radial-gradient(ellipse, var(--color-primary-light) 0%, transparent 70%);
  pointer-events: none;
}
.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.hero__badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}
.hero__title {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}
.hero__title .accent {
  color: var(--color-primary);
}
.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 640px;
  line-height: 1.6;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  min-height: 44px;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: white;
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--color-primary-glow);
}
.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn svg {
  width: 18px;
  height: 18px;
}

/* === SECTIONS === */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.section--alt {
  background: var(--color-surface);
}
.section__header {
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}
.section__label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}
.section__title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  max-width: 640px;
}

/* === SERVICE CARDS === */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
  position: relative;
  overflow: hidden;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.service-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.service-card__icon svg {
  width: 28px;
  height: 28px;
}
.service-card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.service-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.service-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.service-card__tag {
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

/* === REFERENZEN (Clients) === */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}
.client-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
}
.client-card__logo {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-sm);
}
.client-card__info h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.client-card__info p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* === QUALIFIKATIONEN === */
.quals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}
.qual-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.qual-group__title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.qual-group__title svg { width: 18px; height: 18px; }
.qual-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.qual-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  line-height: 1.5;
}
.qual-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 0.5em;
}

/* === ABOUT === */
.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .about-content {
    grid-template-columns: 2fr 1fr;
    gap: var(--space-12);
  }
}
.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}
.about__text p:last-child { margin-bottom: 0; }
.about__highlight {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  align-self: start;
}
.about__stat {
  text-align: center;
}
.about__stat-value {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}
.about__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}
.about__note {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.about__note svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}

/* === CONTACT FORM === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}
.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.contact__info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}
.contact__info-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}
.contact__info-icon svg { width: 20px; height: 20px; }
.contact__info-text h3 {
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-1);
}
.contact__info-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.form__input,
.form__textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
  width: 100%;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--color-text-faint);
}
.form__textarea {
  min-height: 140px;
  resize: vertical;
}
/* Honeypot — visually hidden */
.form__hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
  tab-index: -1;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
@media (max-width: 480px) {
  .form__row { grid-template-columns: 1fr; }
}

.form__submit {
  align-self: flex-start;
}

.form__notice {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.5;
}

/* === FOOTER === */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  list-style: none;
}
.footer__links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer__links a:hover { color: var(--color-primary); }
.footer__attribution {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  width: 100%;
  text-align: center;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.footer__attribution a {
  color: var(--color-text-muted);
}
.footer__attribution a:hover {
  color: var(--color-primary);
}

/* === COOKIE CONSENT BANNER === */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6);
  z-index: 200;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  box-shadow: 0 -4px 24px rgba(0,0,0,0.3);
  transform: translateY(0);
  transition: transform 0.4s ease;
}
.cookie-banner.hidden {
  transform: translateY(100%);
  pointer-events: none;
}
.cookie-banner__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
}
.cookie-banner__btn {
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 44px;
}
.cookie-banner__btn:hover {
  background: var(--color-primary-hover);
}

/* === LEGAL PAGES === */
.legal {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.legal h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
}
.legal h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}
.legal h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.legal p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}
.legal ul, .legal ol {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  line-height: 1.7;
}
.legal li {
  margin-bottom: var(--space-2);
}
.legal a {
  color: var(--color-primary);
}
.legal a:hover { text-decoration: underline; }
.legal strong { color: var(--color-text); }

/* === SCROLL ANIMATIONS === */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === MISC === */
.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
  margin-block: var(--space-4);
}

/* Teal gradient line accent at top of page */
.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover), var(--color-primary));
}