/* ===========================
   CSS Reset & Variablen
   =========================== */

/* Reset */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

/* Box sizing and base setup */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  line-height: 1.5;
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

:root {
  /* Farben */
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-border: #dee2e6;
  --color-text: #212529;
  --color-primary: #005f99;
  --color-accent: #e07a00;
  --color-muted: #6c757d;

  /* Typografie */
  --font-base: 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Layout */
  --max-width: 1200px;
  --sidebar-width: 250px;

  /* Breakpoints */
  --bp-sm: 640px;
  --bp-md: 1024px;
  --bp-lg: 1440px;
}

/* ===========================
   App Shell Layout
   =========================== */

.app-shell {
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
  min-height: 100vh;
}

.app-header {
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--spacing-md);
}

.app-main {
  display: flex;
  flex-grow: 1;
  background-color: var(--color-surface);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.app-sidebar {
  flex: 0 0 var(--sidebar-width);
  background-color: var(--color-bg);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-md);
}

.app-footer {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: center;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

/* Responsive Anpassungen */
@media (max-width: 1024px) {
  .app-main {
    flex-direction: column;
  }
  .app-sidebar {
    flex: 0 0 auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
}

/* Footer Copyright */
.app-footer::after {
  content: '© 2026 Donau2Space.de';
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}