/* ==========================================================================
   consulting.herrlichai.de – Custom Styles
   Supplements Tailwind CSS CDN. Design System: Apple HIG inspired.
   ========================================================================== */

/* ---------- Kind Sans Font ---------- */
@font-face {
  font-family: 'Kind Sans';
  src: url('../fonts/KindSans-Thin.woff2') format('woff2');
  font-weight: 100;
  font-style: normal;
  font-display: swap;
}

/* ---------- Design Tokens ---------- */
:root {
  --color-primary: #162a2c;
  --color-primary-light: #1e3a3d;
  --color-accent: #162a2c;
  --color-accent-hover: #1e3a3d;
  --color-accent-warm: #c49a6c;
  --color-bg: #fefcf6;
  --color-surface: #ffffff;
  --color-footer: #171A21;
  --color-text-primary: #1C1C1E;
  --color-text-secondary: #A5A6AA;
  --color-border: #E2E2E2;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);

  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ---------- Base ---------- */
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ---------- Display Typography (Kind Sans) ---------- */
.font-display,
h1,
.text-5xl,
.text-6xl,
.text-7xl {
  font-family: 'Kind Sans', 'Inter', system-ui, sans-serif;
  font-weight: 100;
  letter-spacing: -0.02em;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-secondary);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s var(--transition) forwards;
}

.fade-in-left {
  animation: fadeInLeft 0.6s var(--transition) forwards;
}

.fade-in-right {
  animation: fadeInRight 0.6s var(--transition) forwards;
}

.scale-in {
  animation: scaleIn 0.6s var(--transition) forwards;
}

/* Scroll-triggered animation: invisible until observed */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}

[data-animate="fade-in-left"] {
  transform: translateX(-30px);
}

[data-animate="fade-in-right"] {
  transform: translateX(30px);
}

[data-animate="scale-in"] {
  transform: scale(0.9);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

/* Staggered delays */
[data-delay="1"] { transition-delay: 0.1s; }
[data-delay="2"] { transition-delay: 0.2s; }
[data-delay="3"] { transition-delay: 0.3s; }
[data-delay="4"] { transition-delay: 0.4s; }
[data-delay="5"] { transition-delay: 0.5s; }
[data-delay="6"] { transition-delay: 0.6s; }

/* ---------- Header ---------- */
.glass-header {
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background-color: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition), box-shadow var(--transition);
}

.glass-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

/* ---------- Navigation ---------- */
.nav-link {
  position: relative;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--color-primary);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  width: 100%;
}

/* ---------- Mobile Nav ---------- */
.nav-mobile {
  position: fixed;
  inset: 0;
  background-color: rgba(22, 42, 44, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 90;
}

.nav-mobile .nav-link {
  color: var(--color-surface);
  font-size: 1.5rem;
}

.nav-mobile .nav-link::after {
  bottom: -4px;
}

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

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 100;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-open .hamburger span {
  background-color: var(--color-surface);
}

.nav-open .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-open .hamburger span:nth-child(2) {
  opacity: 0;
}

.nav-open .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, #24504f 100%);
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ---------- Cards ---------- */
.card-hover {
  box-shadow: 0 6px 9px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 50px rgba(0, 0, 0, 0.08);
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid var(--color-primary);
  transition: opacity var(--transition), transform var(--transition);
  cursor: pointer;
}

.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: transparent;
  color: var(--color-primary);
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid var(--color-primary);
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
  cursor: pointer;
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
  transform: translateY(-2px);
}

/* ---------- Section Dark ---------- */
.section-dark {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

.section-dark .text-secondary {
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- Methodology Line ---------- */
.methodology-line {
  position: relative;
}

.methodology-line::before {
  content: '';
  position: absolute;
  background-color: var(--color-accent);
  opacity: 0.3;
}

/* Desktop: horizontal line */
@media (min-width: 768px) {
  .methodology-line::before {
    top: 2rem;
    left: 10%;
    right: 10%;
    height: 2px;
  }
}

/* Mobile: vertical line */
@media (max-width: 767px) {
  .methodology-line::before {
    top: 0;
    bottom: 0;
    left: 1.5rem;
    width: 2px;
  }
}

/* ---------- Service Icon ---------- */
.service-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: rgba(22, 42, 44, 0.06);
  color: var(--color-primary);
  flex-shrink: 0;
  transition: background-color var(--transition), transform var(--transition);
}

.service-icon:hover {
  background-color: rgba(22, 42, 44, 0.12);
  transform: scale(1.05);
}

/* ---------- Utility ---------- */
.font-serif {
  font-family: 'Lora', Georgia, 'Times New Roman', serif;
}

.text-warm {
  color: var(--color-accent-warm);
}

/* ---------- Responsive ---------- */
@media (max-width: 767px) {
  .hamburger {
    display: flex;
  }
}

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

  .nav-mobile {
    display: none;
  }
}

/* ---------- Apple HIG Dynamic Effects ---------- */

/* Smooth scale feedback on interactive cards */
.service-card {
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 60px -12px rgba(0,0,0,0.1), 0 8px 24px -8px rgba(0,0,0,0.06);
}
.service-card:active {
  transform: translateY(-2px) scale(0.98);
  transition-duration: 0.15s;
}

/* Image reveal with subtle zoom on scroll */
.img-reveal {
  overflow: hidden;
  border-radius: var(--radius-lg);
}
.img-reveal img {
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.img-reveal:hover img {
  transform: scale(1.03);
}

/* Smooth underline link animation */
.link-underline {
  position: relative;
  text-decoration: none;
}
.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: currentColor;
  transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.link-underline:hover::after {
  width: 100%;
}

/* Section entrance animation with stagger */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.stagger-children.is-visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.is-visible > *:nth-child(2) { transition-delay: 0.08s; }
.stagger-children.is-visible > *:nth-child(3) { transition-delay: 0.16s; }
.stagger-children.is-visible > *:nth-child(4) { transition-delay: 0.24s; }
.stagger-children.is-visible > *:nth-child(5) { transition-delay: 0.32s; }
.stagger-children.is-visible > *:nth-child(6) { transition-delay: 0.40s; }
.stagger-children.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Parallax-ready sections */
.parallax-bg {
  will-change: transform;
  transition: transform 0.1s linear;
}

/* Floating badge/label animation */
@keyframes float-subtle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.float-subtle {
  animation: float-subtle 3s ease-in-out infinite;
}

/* Gradient text effect for headings */
.text-gradient {
  background: linear-gradient(135deg, #162a2c, #2d5457);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Smooth number counter pulse */
@keyframes count-pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}
.count-done {
  animation: count-pulse 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Glass morphism card */
.glass-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Smooth image loading fade */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.5s ease;
}
img[loading="lazy"].loaded,
img[loading="lazy"][complete] {
  opacity: 1;
}

/* Interactive icon hover */
.icon-hover {
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              background-color 0.3s ease;
}
.icon-hover:hover {
  transform: scale(1.08) rotate(-3deg);
  background-color: rgba(22, 42, 44, 0.1);
}

/* Credential/badge shine effect */
@keyframes shine {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}
.badge-shine {
  background: linear-gradient(90deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
  background-size: 200% 100%;
}
.badge-shine:hover {
  animation: shine 1.5s ease forwards;
}

/* Scroll progress indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-primary);
  z-index: 9999;
  transition: width 0.1s linear;
}

/* ---------- Print ---------- */
@media print {
  .glass-header,
  .nav-mobile,
  .hamburger {
    display: none !important;
  }

  a[href]::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: var(--color-text-secondary);
  }

  .hero-gradient {
    background: var(--color-primary) !important;
    animation: none !important;
  }

  body {
    background: #fff;
  }
}

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

  html {
    scroll-behavior: auto;
  }

  [data-animate] {
    opacity: 1;
    transform: none;
  }

  .hero-gradient {
    animation: none;
  }
}