/* ============================================================
   main.css – CSS Custom Properties, Reset & Base Typography
   Schnepper GmbH – Bauunternehmung
   ============================================================ */

/* Self-hosted fonts – DSGVO-konform, kein Google-Kontakt */
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/open-sans-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/open-sans-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/fonts/open-sans-600-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/fonts/open-sans-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Roboto Condensed';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/roboto-condensed-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Roboto Condensed';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/roboto-condensed-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Roboto Condensed';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/roboto-condensed-700-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Roboto Condensed';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/fonts/roboto-condensed-700-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  /* Brand Colors */
  --color-black:    #1a1a1a;
  --color-yellow:   #f5c200;
  --color-yellow-dark: #d4a800;
  --color-white:    #ffffff;
  --color-gray-50:  #fafafa;
  --color-gray-100: #f4f4f4;
  --color-gray-300: #cccccc;
  --color-gray-500: #888888;
  --color-gray-700: #444444;

  /* Typography */
  --font-heading: 'Roboto Condensed', Arial Narrow, Arial, sans-serif;
  --font-body:    'Open Sans', Arial, sans-serif;

  --fs-xs:   0.75rem;    /*  12px */
  --fs-sm:   0.875rem;   /*  14px */
  --fs-base: 1rem;       /*  16px */
  --fs-lg:   1.125rem;   /*  18px */
  --fs-xl:   1.375rem;   /*  22px */
  --fs-2xl:  1.75rem;    /*  28px */
  --fs-3xl:  2.25rem;    /*  36px */
  --fs-4xl:  3rem;       /*  48px */
  --fs-5xl:  3.75rem;    /*  60px */

  --lh-tight:  1.2;
  --lh-snug:   1.4;
  --lh-normal: 1.6;
  --lh-relaxed:1.8;

  /* 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;

  /* Layout */
  --max-width:     1200px;
  --header-height: 80px;

  /* Borders */
  --radius-sm:  2px;
  --radius-md:  4px;
  --radius-lg:  8px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg:  0 8px 24px rgba(0, 0, 0, 0.20);
  --shadow-xl:  0 16px 40px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition:      0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ── CSS Reset ──────────────────────────────────────────────── */
*,
*::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-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-black);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* ── Base Typography ────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--color-black);
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p {
  line-height: var(--lh-relaxed);
  color: var(--color-gray-700);
}

address {
  font-style: normal;
  line-height: var(--lh-relaxed);
}

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

.text-center { text-align: center; }
.text-yellow { color: var(--color-yellow); }
.text-white  { color: var(--color-white); }

.section-label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-yellow);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: var(--fs-3xl);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--fs-lg);
  color: var(--color-gray-500);
  max-width: 60ch;
  margin-inline: auto;
  line-height: var(--lh-relaxed);
}

/* ── Animate on Scroll ──────────────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: none;
}

/* ── Scroll-to-Top Button ───────────────────────────────────── */
#scroll-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: var(--color-yellow);
  color: var(--color-black);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  font-weight: 700;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 200;
  border: none;
}

#scroll-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

#scroll-top:hover {
  transform: translateY(-3px);
  background: var(--color-yellow-dark);
}