/**
 * Theme: Bauunternehmung Markus Müller
 * Style: Clean, Professional, Trustworthy
 * UX Principles: Laws of UX Applied (Fitts's Law, Aesthetic-Usability, etc.)
 */

:root {
  /* ========================================
     COLORS - Baubranche Farbpalette
     ======================================== */

  /* Primary - Müller Rot */
  --primary: #dc342e;
  --primary-hover: #c42d27;
  --primary-light: #e85850;
  --primary-dark: #b42922;

  /* Neutrals - Weiß & Schwarztöne */
  --background: #fafafa;
  --surface: #ffffff;
  --surface-elevated: #ffffff;

  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-tertiary: #6a6a6a;
  --text-on-primary: #ffffff;

  /* Borders & Dividers */
  --border-light: #e5e5e5;
  --border-medium: #d1d1d1;
  --border-dark: #b8b8b8;

  /* States */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Overlays */
  --overlay-light: rgba(0, 0, 0, 0.3);
  --overlay-medium: rgba(0, 0, 0, 0.5);
  --overlay-dark: rgba(0, 0, 0, 0.7);

  /* ========================================
     TYPOGRAPHY
     ======================================== */

  /* Font Families */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-accent: 'Space Grotesk', sans-serif;

  /* Font Sizes - Fluid Typography */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* ========================================
     SPACING - Fitts's Law Applied
     Großzügige Touch-Targets & Whitespace
     ======================================== */

  --space-xs: 0.25rem;     /* 4px */
  --space-sm: 0.5rem;      /* 8px */
  --space-md: 1rem;        /* 16px */
  --space-lg: 1.5rem;      /* 24px */
  --space-xl: 2rem;        /* 32px */
  --space-2xl: 3rem;       /* 48px */
  --space-3xl: 4rem;       /* 64px */
  --space-4xl: 6rem;       /* 96px */
  --space-5xl: 8rem;       /* 128px */

  /* Section Spacing */
  --section-padding-y: clamp(3rem, 8vw, 6rem);
  --section-padding-x: clamp(1rem, 5vw, 3rem);

  /* Container */
  --container-max: 1280px;
  --container-padding: var(--space-lg);

  /* ========================================
     BORDERS & RADIUS
     ======================================== */

  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  --border-width: 1px;
  --border-width-thick: 2px;

  /* ========================================
     SHADOWS - Subtle & Professional
     ======================================== */

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08),
               0 1px 2px -1px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08),
               0 2px 4px -2px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08),
               0 4px 6px -4px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08),
               0 8px 10px -6px rgba(0, 0, 0, 0.08);

  /* Card Shadow - Hover Effect */
  --shadow-card: var(--shadow-sm);
  --shadow-card-hover: var(--shadow-lg);

  /* ========================================
     TRANSITIONS & ANIMATIONS
     ======================================== */

  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ========================================
     COMPONENTS - UX Optimized
     ======================================== */

  /* Buttons - Fitts's Law (min 48px touch target) */
  --button-height-sm: 2.5rem;    /* 40px */
  --button-height-md: 3rem;      /* 48px - Optimal Touch */
  --button-height-lg: 3.5rem;    /* 56px */
  --button-padding-x: var(--space-xl);
  --button-radius: var(--radius-md);

  /* Cards */
  --card-padding: var(--space-xl);
  --card-radius: var(--radius-lg);
  --card-border: var(--border-light);

  /* Input Fields */
  --input-height: 3rem;          /* 48px - Touch friendly */
  --input-padding-x: var(--space-lg);
  --input-radius: var(--radius-md);
  --input-border: var(--border-medium);
  --input-border-focus: var(--primary);

  /* Navigation */
  --nav-height: 5rem;            /* 80px */
  --nav-link-padding: var(--space-lg);

  /* ========================================
     Z-INDEX LAYERS
     ======================================== */

  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ========================================
   GLOBAL RESETS & BASE STYLES
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--background);
  overflow-x: hidden;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-md);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--primary-hover);
}

/* ========================================
   UTILITY CLASSES - UX Optimized
   ======================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.section {
  padding-block: var(--section-padding-y);
  padding-inline: var(--section-padding-x);
}

/* Accessibility - Focus States */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Skip to Content Link (Accessibility) */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--text-on-primary);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: var(--space-md);
}

/* Responsive Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Selection Colors */
::selection {
  background-color: var(--primary);
  color: var(--text-on-primary);
}

::-moz-selection {
  background-color: var(--primary);
  color: var(--text-on-primary);
}

/* ========================================
   RESPONSIVE BREAKPOINTS
   ======================================== */

/* Mobile First Approach */
/* xs: 0-639px */
/* sm: 640px+ */
/* md: 768px+ */
/* lg: 1024px+ */
/* xl: 1280px+ */
/* 2xl: 1536px+ */

@media (min-width: 768px) {
  :root {
    --text-5xl: 4rem;      /* 64px on desktop */
    --text-6xl: 4.5rem;    /* 72px on desktop */
  }
}

@media (min-width: 1024px) {
  :root {
    --section-padding-y: 6rem;
  }
}