/**
 * Berlin Gateway Centralized Layout System CSS
 * Master CSS module for institutional consistency
 * Based on /de/chancenkarte.html as the visual authority reference
 */

:root {
  --color-black: #1A1D24;
  --color-white: #FFFFFF;
  --color-dark-gray: #2A2F3A;
  --color-light-gray: #f8f9fa;
  --color-border: #D9E1EA;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 20px;
  --spacing-xl: 40px;
  --spacing-xxl: 60px;
  --font-family: 'Inter', sans-serif;
}

/* GLOBAL RESET */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  color: var(--color-black);
  background: var(--color-white);
}

/* TYPOGRAPHY SYSTEM */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: 32px;
  font-weight: 800;
}

h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

p {
  font-size: 16px;
  line-height: 1.6;
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.85;
}

/* INSTITUTIONAL CARD SYSTEM */
.card,
.intelligence-card,
.demand-card,
.navigation-module {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--spacing-lg);
  transition: box-shadow 0.2s;
}

.card:hover,
.intelligence-card:hover,
.demand-card:hover,
.navigation-module:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.intelligence-card {
  border-left: 4px solid var(--color-black);
  background: var(--color-light-gray);
}

.demand-card {
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
}

.navigation-module {
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
}

.navigation-module a {
  display: inline-block;
  margin-top: 12px;
  color: var(--color-black);
  font-weight: 600;
  font-size: 14px;
}

/* BUTTON SYSTEM */
button,
.btn,
input[type="button"],
input[type="submit"] {
  background: var(--color-black);
  color: var(--color-white);
  border: 1px solid var(--color-black);
  padding: 12px 24px;
  border-radius: 4px;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

button:hover,
.btn:hover,
input[type="button"]:hover,
input[type="submit"]:hover {
  background: var(--color-dark-gray);
  border-color: var(--color-dark-gray);
}

button:focus,
.btn:focus,
input[type="button"]:focus,
input[type="submit"]:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-black);
}

/* SPACING SYSTEM (Dense - 20-30% reduction) */
section,
.section {
  padding: var(--spacing-xl) 0;
}

section + section,
.section + .section {
  margin-top: 0;
}

.container,
.chancenkarte-container,
.content-block {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* GRID SYSTEMS */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.demand-cards,
.navigation-modules {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

/* FORM ELEMENTS */
input,
textarea,
select {
  font-family: var(--font-family);
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  width: 100%;
  transition: border-color 0.2s;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-black);
  box-shadow: 0 0 0 2px rgba(26, 29, 36, 0.1);
}

/* INSTITUTIONAL HEADER SYSTEM */
.top-band {
  background: var(--color-black);
  color: var(--color-white);
  padding: 12px 0;
  font-size: 12px;
}

.top-band__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-band__left a,
.top-band__right a {
  color: var(--color-white);
  margin-right: 20px;
}

.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}

.header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-black);
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-icon {
  width: 24px;
  height: 24px;
  background: var(--color-black);
  border-radius: 4px;
}

.nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  color: var(--color-black);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: opacity 0.2s;
}

.nav-link:hover,
.nav-link.active {
  opacity: 0.7;
  border-bottom: 2px solid var(--color-black);
  padding-bottom: 2px;
}

.subnav {
  background: var(--color-black);
  color: var(--color-white);
  padding: 12px 0;
  font-size: 12px;
}

.subnav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 40px;
}

.subnav__inner a {
  color: var(--color-white);
  font-weight: 600;
}

/* INSTITUTIONAL FOOTER SYSTEM */
.footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xxl);
}

.footer .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer h4 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.footer p,
.footer a {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 8px;
}

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

/* MOBILE OPTIMIZATION */
@media (max-width: 768px) {
  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 16px;
  }

  p {
    font-size: 14px;
  }

  section,
  .section {
    padding: var(--spacing-lg) 0;
  }

  .container,
  .chancenkarte-container,
  .content-block {
    padding: 0 16px;
  }

  .header__inner,
  .top-band__inner,
  .subnav__inner {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .nav {
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 12px 0;
  }

  .demand-cards,
  .navigation-modules,
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .top-band__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-band__right {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 20px;
  }

  h2 {
    font-size: 18px;
  }

  p {
    font-size: 13px;
  }

  section,
  .section {
    padding: var(--spacing-md) 0;
  }

  .container,
  .chancenkarte-container,
  .content-block {
    padding: 0 12px;
  }

  .card,
  .intelligence-card,
  .demand-card,
  .navigation-module {
    padding: var(--spacing-md);
  }

  button,
  .btn {
    padding: 10px 16px;
    font-size: 13px;
  }
}

/* REMOVE ALL BLUE ACCENTS */
.btn-blue,
.blue-accent,
.blue-border {
  background: var(--color-black) !important;
  border-color: var(--color-black) !important;
  color: var(--color-white) !important;
}

/* Ensure no blue focus rings */
:focus-visible {
  outline: 2px solid var(--color-black);
  outline-offset: 2px;
}

/* Institutional density */
.dense {
  margin: 0 !important;
  padding: 0 !important;
}

.dense > * + * {
  margin-top: var(--spacing-sm);
}