/* ============================================================
   WITTEWERK — style.css
   Mobile-first, Vanilla CSS, Dark Mode via prefers-color-scheme
   ============================================================ */

/* ===========================
   Custom Properties
   =========================== */
:root {
  --color-primary:        #1D9E75;
  --color-primary-dark:   #158A62;
  --color-secondary:      #2C2C2A;
  --color-bg:             #FAFAF8;
  --color-surface:        #F3F3F0;
  --color-text:           #2C2C2A;
  --color-text-muted:     #6B6B67;
  --color-border:         rgba(44, 44, 42, 0.08);
  --font-main:            'Outfit', system-ui, -apple-system, sans-serif;
  --container-max:        1200px;
  --container-pad:        1.25rem;
  --radius-sm:            0.5rem;
  --radius-md:            0.75rem;
  --radius-lg:            1rem;
  --radius-xl:            1.5rem;
  --ease:                 0.25s ease;
  --header-h:             68px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:           #1A1A18;
    --color-surface:      #222220;
    --color-text:         #E8E8E4;
    --color-text-muted:   #9A9A94;
    --color-border:       rgba(255, 255, 255, 0.07);
  }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: var(--font-main); }

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-text-muted);
  border-radius: 999px;
  opacity: 0.4;
}

/* ===========================
   Layout Utilities
   =========================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

@media (min-width: 768px) {
  :root { --container-pad: 2rem; }
}

@media (min-width: 1024px) {
  :root { --container-pad: 3rem; }
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--ease),
    border-color var(--ease),
    box-shadow var(--ease),
    transform var(--ease),
    color var(--ease);
  white-space: nowrap;
  user-select: none;
}

.btn:active { transform: scale(0.97); }
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  box-shadow: 0 4px 18px rgba(29, 158, 117, 0.28);
}

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

/* ===========================
   Fade-in Scroll Animation
   =========================== */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for grid children */
.apps-grid  .app-card:nth-child(2),
.werte-grid .wert-item:nth-child(2) { transition-delay: 0.1s; }

.apps-grid  .app-card:nth-child(3),
.werte-grid .wert-item:nth-child(3) { transition-delay: 0.2s; }

/* ===========================
   Section Header
   =========================== */
.section-header {
  margin-bottom: 3rem;
}
.section-header h2 {
  font-size: clamp(1.875rem, 4vw, 2.625rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--color-text);
}

/* ===========================
   Header
   =========================== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  transition: box-shadow var(--ease), background-color var(--ease);
}

#site-header.scrolled {
  background-color: rgba(250, 250, 248, 0.90);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--color-border);
}

@media (prefers-color-scheme: dark) {
  #site-header.scrolled {
    background-color: rgba(26, 26, 24, 0.90);
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
}
.logo-icon { flex-shrink: 0; }
.logo-wordmark {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1;
}
.logo-witte { color: #2C2C2A; }
.logo-werk  { color: var(--color-primary); }

@media (prefers-color-scheme: dark) {
  .logo-witte { color: var(--color-text); }
}

/* Nav — hidden on mobile, flex on tablet+ */
#main-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

@media (min-width: 768px) {
  #main-nav { display: flex; }
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--ease);
}
.nav-link:hover { color: var(--color-text); }

.nav-cta {
  padding: 0.5rem 1.25rem;
  font-size: 0.9375rem;
}

/* Hamburger button */
#hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  transition: background-color var(--ease);
}
#hamburger:hover { background-color: var(--color-surface); }
#hamburger:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

#hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-text);
  border-radius: 999px;
  transition: transform var(--ease), opacity var(--ease);
  transform-origin: center;
}
#hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 768px) {
  #hamburger { display: none; }
}

/* Mobile nav overlay */
@media (max-width: 767px) {
  #main-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--ease), transform var(--ease);
  }
  #main-nav.open {
    display: flex;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-link {
    font-size: 1.5rem;
    font-weight: 600;
  }
  .nav-cta {
    padding: 0.75rem 2.25rem;
    font-size: 1rem;
  }
}

/* ===========================
   Hero Section
   =========================== */
#hero {
  padding: 5rem 0 6rem;
  overflow: hidden;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3rem;
}

@media (min-width: 1024px) {
  .hero-inner {
    flex-direction: row;
    align-items: center;
  }
}

.hero-content {
  flex: 1;
  max-width: 620px;
}

.hero-headline {
  font-size: clamp(2.75rem, 7.5vw, 5.25rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.04;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.hero-subline {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 500px;
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

.hero-decoration {
  display: none;
}

@media (min-width: 1024px) {
  .hero-decoration {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 300px;
    height: 300px;
    opacity: 0.13;
    animation: float 7s ease-in-out infinite;
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-18px); }
}

/* ===========================
   Apps Section
   =========================== */
#apps {
  padding: 6rem 0;
  background-color: var(--color-surface);
}

.apps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .apps-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .apps-grid { grid-template-columns: repeat(3, 1fr); }
}

.app-card {
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: transform var(--ease), box-shadow var(--ease);
  cursor: default;
}

.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.07);
}

@media (prefers-color-scheme: dark) {
  .app-card:hover {
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
  }
}

.app-icon {
  width: 52px;
  height: 52px;
  background-color: rgba(29, 158, 117, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: background-color var(--ease);
}
.app-card:hover .app-icon {
  background-color: rgba(29, 158, 117, 0.16);
}
.app-icon svg {
  width: 26px;
  height: 26px;
}

.app-meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-primary);
  background-color: rgba(29, 158, 117, 0.1);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  width: fit-content;
  margin-bottom: 0.2rem;
}

.app-card h3 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.2;
}

.app-tagline {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.app-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ===========================
   Werte Section
   =========================== */
#werte {
  padding: 6rem 0;
  background-color: var(--color-bg);
}

.werte-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem 3rem;
}

@media (min-width: 768px) {
  .werte-grid { grid-template-columns: repeat(3, 1fr); }
}

.wert-item {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.wert-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}
.wert-icon svg {
  width: 40px;
  height: 40px;
}

.wert-item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  line-height: 1.3;
}

.wert-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ===========================
   About Section
   =========================== */
#about {
  padding: 6rem 0;
  background-color: var(--color-surface);
  overflow: hidden;
  position: relative;
}

.about-inner {
  position: relative;
}

.about-content {
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.about-content p {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.75;
  color: var(--color-text-muted);
}

.about-tagline {
  font-size: clamp(3.5rem, 14vw, 10rem);
  font-weight: 700;
  letter-spacing: -0.045em;
  color: var(--color-text);
  opacity: 0.05;
  margin-top: 0.5rem;
  line-height: 1;
  user-select: none;
  pointer-events: none;
}

/* ===========================
   Footer
   =========================== */
#site-footer {
  background-color: #2C2C2A;
  color: #B4B2A9;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-top: 3.5rem;
  padding-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
    align-items: start;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  transition: opacity var(--ease);
}
.footer-logo:hover { opacity: 0.85; }

.footer-wordmark {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.footer-tagline {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #B4B2A9;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.footer-links a {
  font-size: 0.9375rem;
  color: #B4B2A9;
  transition: color var(--ease);
}
.footer-links a:hover { color: #fff; }

.footer-social {
  display: flex;
  gap: 1rem;
  align-items: center;
}
.footer-social a {
  color: #B4B2A9;
  transition: color var(--ease);
  border-radius: var(--radius-sm);
  padding: 0.25rem;
}
.footer-social a:hover { color: #fff; }
.footer-social a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-copyright .container {
  padding-top: 1.25rem;
  padding-bottom: 1.5rem;
}
.footer-copyright p {
  font-size: 0.8125rem;
  color: rgba(180, 178, 169, 0.5);
}