/* =========================================
   LEITZ SOFT TECHNOLOGIES — Corporate Website
   Dark theme, teal accent (#1A7A72)
   ========================================= */

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

:root {
  /* Color System */
  --color-bg:         #0C0F12;
  --color-surface:    #121619;
  --color-surface-2:  #181C20;
  --color-surface-3:  #1E2328;
  --color-border:     #2A2F35;
  --color-border-subtle: #1E2328;

  --color-text:       #E2E4E7;
  --color-text-muted: #8A8F96;
  --color-text-faint: #555B63;

  --color-accent:     #1A7A72;
  --color-accent-light: #22A396;
  --color-accent-glow: rgba(26, 122, 114, 0.15);
  --color-accent-glow-strong: rgba(26, 122, 114, 0.3);

  /* Typography */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;

  /* Type Scale */
  --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 */
  --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;

  /* Misc */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --transition-fast: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);
  --content-max: 1120px;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
img, svg { display: block; max-width: 100%; }

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

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

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

/* ---------- HEADER ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(12, 15, 18, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.header--hidden {
  transform: translateY(-100%);
}

.header--scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.3);
}

.header__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  transition: opacity var(--transition-fast);
}

.header__logo:hover {
  opacity: 0.8;
}

.header__nav {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav-link:hover {
  color: var(--color-text);
}

/* Mobile menu button */
.header__menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  z-index: 110;
}

.header__menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  border-radius: 1px;
}

.header__menu-btn.active span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}
.header__menu-btn.active span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(12, 15, 18, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-smooth);
  pointer-events: none;
}

.mobile-nav.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  text-align: center;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover {
  color: var(--color-accent-light);
}

@media (max-width: 768px) {
  .header__nav { display: none; }
  .header__menu-btn { display: flex; }
  .mobile-nav { display: flex; }
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-32) var(--space-6) var(--space-16);
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse at center, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: var(--space-6);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-accent-glow-strong);
  border-radius: var(--radius-xl);
  background: var(--color-accent-glow);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.01em;
}

.hero__accent {
  color: var(--color-accent-light);
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

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

.hero__line {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  letter-spacing: 0.01em;
}

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

.btn--primary:hover {
  background: var(--color-accent-light);
  box-shadow: 0 0 24px var(--color-accent-glow);
}

.btn--outline {
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.btn--outline:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

/* ---------- SECTION BASE ---------- */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) var(--space-6);
}

.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.section__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: var(--space-4);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- PRODUCTS ---------- */
.products {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 900px) {
  .products__grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}

.product-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.product-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 32px var(--color-accent-glow);
}

.product-card__icon {
  margin-bottom: var(--space-5);
}

.product-card__name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.product-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  flex-grow: 1;
  margin-bottom: var(--space-6);
}

.product-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent-light);
  transition: color var(--transition-fast), gap var(--transition-fast);
}

.product-card__link:hover {
  color: var(--color-text);
  gap: var(--space-3);
}

.product-card__link svg {
  flex-shrink: 0;
}

/* ---------- ABOUT ---------- */
.about__layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

@media (max-width: 768px) {
  .about__layout {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

.about__text .section__label {
  text-align: left;
}

.about__text .section__title {
  text-align: left;
  margin-bottom: var(--space-6);
}

.about__body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
  max-width: 54ch;
}

.about__body:last-child {
  margin-bottom: 0;
  color: var(--color-text);
  font-weight: 500;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding-top: var(--space-12);
}

@media (max-width: 768px) {
  .about__stats {
    padding-top: 0;
  }
}

.stat {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
}

.stat__number {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent-light);
  margin-bottom: var(--space-1);
}

.stat__label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* ---------- CONTACT ---------- */
.contact {
  border-top: 1px solid var(--color-border-subtle);
}

.contact__layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 768px) {
  .contact__layout {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

.contact__text .section__label {
  text-align: left;
}

.contact__text .section__title {
  text-align: left;
  margin-bottom: var(--space-4);
}

.contact__body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 48ch;
}

.contact__email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-accent-light);
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.contact__email:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-2);
}

.contact__email svg {
  flex-shrink: 0;
  color: var(--color-accent-light);
}

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-10) var(--space-6) var(--space-8);
  background: var(--color-surface);
}

.footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

@media (max-width: 640px) {
  .footer__top {
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
  }
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
}

.footer__nav {
  display: flex;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  cursor: pointer;
}

.footer__link:hover {
  color: var(--color-text);
}

.footer__link.active {
  color: var(--color-accent-light);
}

/* Footer inline sections (Impressum, Datenschutz) */
.footer__section {
  max-height: 0;
  overflow: hidden;
  transition: max-height 500ms cubic-bezier(0.16, 1, 0.3, 1), padding 500ms cubic-bezier(0.16, 1, 0.3, 1);
  border-top: 0 solid transparent;
}

.footer__section.open {
  max-height: 2000px;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-8);
  margin-top: var(--space-6);
}

.footer__section-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.legal-text {
  max-width: 680px;
}

.legal-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.legal-text p:last-child {
  margin-bottom: 0;
}

.legal-text a {
  color: var(--color-accent-light);
  transition: color var(--transition-fast);
}

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

.legal-text h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.legal-text h4:first-child {
  margin-top: 0;
}

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

/* ---------- SCROLL ANIMATION ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Staggered children */
.stagger > .fade-up:nth-child(2) { transition-delay: 100ms; }
.stagger > .fade-up:nth-child(3) { transition-delay: 200ms; }

/* ---------- SR ONLY ---------- */
.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;
}