/* Schwaebits – minimalistisches, technisches Design */

:root {
  --color-bg: #f7f8fa;
  --color-bg-alt: #eef1f5;
  --color-surface: #ffffff;
  --color-text: #1a2332;
  --color-text-muted: #5a6578;
  --color-border: #d8dee8;
  --color-accent: #2d5a7b;
  --color-accent-hover: #234a66;
  --color-accent-soft: rgba(45, 90, 123, 0.08);

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(26, 35, 50, 0.04);
  --shadow-md: 0 4px 16px rgba(26, 35, 50, 0.06);

  --header-height: 4rem;
  --max-width: 72rem;
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color var(--transition);
}

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3 {
  margin: 0 0 var(--space-sm);
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.875rem, 5vw, 2.75rem);
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
}

h3 {
  font-size: 1.125rem;
}

p {
  margin: 0 0 var(--space-sm);
}

p:last-child {
  margin-bottom: 0;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 200;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(247, 248, 250, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.0625rem;
}

.logo:hover {
  color: var(--color-text);
}

.logo-mark {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--color-accent) 0%, #3d6d8f 100%);
  flex-shrink: 0;
}

.logo-suffix {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.9em;
}

/* Navigation */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle-bar {
  display: block;
  width: 1.125rem;
  height: 2px;
  margin-inline: auto;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  inset: var(--header-height) 0 auto 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
}

.site-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-list a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.nav-list a:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.nav-cta {
  color: var(--color-accent) !important;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    padding: 0;
    border: none;
    background: transparent;
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: 0.25rem;
  }

  .nav-list a {
    padding: 0.375rem 0.75rem;
    font-size: 0.9375rem;
  }
}

/* Hero */
.hero {
  padding: var(--space-xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.hero-inner {
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hero-lead {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: inherit;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Sections */
.section {
  padding: var(--space-xl) 0;
}

.section-alt {
  background: var(--color-bg-alt);
  border-block: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto var(--space-lg);
}

.section-header-left {
  text-align: left;
  margin-inline: 0;
  max-width: none;
}

.section-intro {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

/* Cards */
.card-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c5cdd9;
}

.card h3 {
  margin-bottom: 0.625rem;
}

.card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* Ansatz */
.ansatz-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .ansatz-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list li {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

/* About */
.about-inner {
  max-width: 40rem;
  margin-inline: auto;
  text-align: center;
}

.about-text {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
}

/* Contact */
.section-contact {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  max-width: 28rem;
  margin-inline: auto;
  text-align: center;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-list li {
  padding: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.contact-list a {
  font-size: 1.0625rem;
  font-weight: 500;
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  padding: var(--space-lg) 0;
  background: var(--color-text);
  color: #c5cdd9;
  font-size: 0.875rem;
}

.footer-inner {
  text-align: center;
}

.footer-brand {
  margin: 0 0 0.25rem;
  font-weight: 600;
  color: #fff;
  font-size: 1rem;
}

.footer-tagline {
  margin: 0 0 var(--space-md);
  color: #8b96a8;
  font-size: 0.8125rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer-nav a {
  color: #c5cdd9;
  text-decoration: none;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-copy {
  margin: 0;
  color: #6b7789;
  font-size: 0.8125rem;
}

/* Legal pages */
.page-legal {
  padding: var(--space-lg) 0 var(--space-xl);
}

.page-legal .container {
  max-width: 42rem;
}

.page-legal h1 {
  margin-bottom: var(--space-md);
}

.page-legal h2 {
  font-size: 1.25rem;
  margin-top: var(--space-lg);
}

.page-legal p,
.page-legal li {
  color: var(--color-text-muted);
}

.page-legal ul {
  list-style: disc;
  padding-left: 1.25rem;
  margin-bottom: var(--space-sm);
}

.todo-block {
  margin: var(--space-md) 0;
  padding: var(--space-md);
  background: #fff8e6;
  border: 1px dashed #d4a84b;
  border-radius: var(--radius-md);
  color: #6b5a2e;
  font-size: 0.9375rem;
}

.todo-block strong {
  display: block;
  margin-bottom: 0.25rem;
  color: #5a4a1f;
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-md);
  font-weight: 500;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.legal-updated {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}