/* ============================================
   THE SKINCODE — Design System & Global Styles
   Aesthetic: Educational Luxury / Dermatology meets Functional Beauty
   Palette: Warm-neutral (Taupe, Sand, Creme, Warm White)
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg:        #FAFAF7;
  --color-surface:   #FFFFFF;
  --color-cream:     #F5F0EB;
  --color-sand:      #E8DDD0;
  --color-sand-light:#F0EBE3;
  --color-taupe:     #B8A089;
  --color-taupe-dark:#8C7A68;
  --color-warm-dark: #3A3530;
  --color-text:      #2C2826;
  --color-text-soft: #7A7470;
  --color-text-muted:#7A6F68;
  --color-border:    #E8E3DC;
  --color-border-light:#F0ECE6;
  --color-accent:    #C4A882;
  --color-accent-hover:#B8996F;
  --color-white:     #FFFFFF;
  --color-overlay:   rgba(58, 53, 48, 0.04);

  /* Typography */
  --font-serif:   'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:    'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs:   0.75rem;   /* 12px */
  --font-size-sm:   0.8125rem; /* 13px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-md:   1.125rem;  /* 18px */
  --font-size-lg:   1.25rem;   /* 20px */
  --font-size-xl:   1.5rem;    /* 24px */
  --font-size-2xl:  2rem;      /* 32px */
  --font-size-3xl:  2.5rem;    /* 40px */
  --font-size-hero: clamp(2.5rem, 2rem + 2vw, 3.5rem);

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --max-width:   1140px;
  --max-width-narrow: 720px;
  --max-width-text:   640px;

  /* Effects */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --shadow-sm:  0 1px 3px rgba(44, 40, 38, 0.06);
  --shadow-md:  0 4px 16px rgba(44, 40, 38, 0.06);
  --shadow-lg:  0 8px 32px rgba(44, 40, 38, 0.08);
  --shadow-xl:  0 16px 48px rgba(44, 40, 38, 0.10);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Component tokens */
  --nav-height:   72px;
  --logo-height:  54px;
  --icon-stroke:  1.5;
  --btn-padding-nav: 10px 22px;
  --card-hover-lift: -4px;
  --card-hover-shadow: var(--shadow-lg);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--color-warm-dark);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-hero);
  line-height: 1.1;
}

h2 {
  font-size: clamp(1.75rem, 1.4rem + 1vw, 2.25rem);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-md);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.text-soft {
  color: var(--color-text-soft);
}

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

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

/* --- Eyebrow / Label --- */
.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-taupe);
  margin-bottom: var(--space-sm);
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.section {
  padding: var(--space-4xl) 0;
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  .section {
    padding: var(--space-3xl) 0;
  }
}

.section--cream {
  background-color: var(--color-cream);
}

.section--surface {
  background-color: var(--color-surface);
}

/* --- Header / Navigation --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav__brand {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-warm-dark);
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-soft);
  position: relative;
  padding: var(--space-sm) var(--space-xs);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: var(--space-xs);
  left: var(--space-xs);
  right: var(--space-xs);
  width: auto;
  max-width: 0;
  height: 1px;
  background: var(--color-taupe);
  transition: max-width var(--transition);
}

.nav__link:hover {
  color: var(--color-warm-dark);
}

.nav__link:hover::after {
  max-width: calc(100% - var(--space-sm));
}

.nav__link.active {
  color: var(--color-warm-dark);
  font-weight: 600;
}

.nav__link.active::after {
  max-width: calc(100% - var(--space-sm));
}

.nav__cta.active {
  background: var(--color-taupe-dark);
}

.nav__cta {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-warm-dark);
  padding: var(--btn-padding-nav);
  border-radius: 999px;
  transition: background var(--transition), transform var(--transition);
}

.nav__cta:hover {
  background: var(--color-taupe-dark);
  transform: translateY(-1px);
}

/* Mobile Navigation */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-warm-dark);
  margin: 5px 0;
  transition: var(--transition);
  border-radius: 2px;
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
    z-index: 110;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-surface);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: var(--space-xl);
    padding: var(--space-3xl);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition);
    z-index: 105;
  }

  .nav__links.active {
    right: 0;
  }

  .nav__link {
    font-size: var(--font-size-base);
  }

  .nav__overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 102;
  }

  .nav__overlay.active {
    display: block;
  }
}

@media (max-width: 480px) {
  .nav__links {
    width: 240px;
    padding: var(--space-2xl);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-taupe-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--color-warm-dark);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-cream);
  border-color: var(--color-sand);
  transform: translateY(-1px);
}

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

.btn--accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  color: var(--color-taupe-dark);
  padding: var(--space-xs) 0;
  border-radius: 0;
  border-bottom: 1px solid var(--color-taupe);
}

.btn--ghost:hover {
  color: var(--color-warm-dark);
  border-color: var(--color-warm-dark);
}

.btn--lg {
  padding: 16px 36px;
  font-size: var(--font-size-base);
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  padding: var(--space-2xl);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--flat {
  border: none;
  background: var(--color-cream);
}

.card--flat:hover {
  background: var(--color-sand-light);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 1px;
  background: var(--color-sand);
  margin: var(--space-xl) 0;
}

.divider--center {
  margin-left: auto;
  margin-right: auto;
}

/* --- Section Header --- */
.section-header {
  max-width: var(--max-width-text);
  margin-bottom: var(--space-3xl);
}

.section-header--center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  color: var(--color-text-soft);
  font-size: var(--font-size-md);
  line-height: 1.8;
}

/* --- Grid System --- */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 968px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* --- Image Placeholder --- */
.img-placeholder {
  background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-sand-light) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  min-height: 300px;
  border: 1px solid var(--color-border-light);
}

/* --- Notice / Disclaimer --- */
.notice {
  background: var(--color-cream);
  border: 1px solid var(--color-sand);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-soft);
  line-height: 1.7;
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-taupe);
  box-shadow: 0 0 0 3px rgba(184, 160, 137, 0.12);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* --- Footer --- */
.footer {
  background: var(--color-warm-dark);
  color: rgba(255, 255, 255, 0.82);
  padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer__brand {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 360px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

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

.footer__heading {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-md);
}

.footer__link {
  display: block;
  padding: var(--space-xs) 0;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--transition);
}

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

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
}

.footer__legal {
  display: flex;
  gap: var(--space-lg);
}

.footer__legal a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition);
}

.footer__legal a:hover {
  color: var(--color-white);
}

/* --- Utility Classes --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* --- Skip-to-main Link (Barrierefreiheit) --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-lg);
  background: var(--color-warm-dark);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 200;
  transition: top var(--transition);
}
.skip-link:focus {
  top: var(--space-sm);
}

/* --- Reveal Animation Fallback --- */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* --- Tech Badges (ueber-mich) --- */
.tech-badge {
  display: inline-block;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 24px;
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-sm);
  font-weight: 500;
}