/* ==========================================================================
   Marco Wilka — Personal & Software Portfolio
   Clean, Minimalist, High-Performance, Accessible CSS
   ========================================================================== */

:root {
  /* Color Palette — Clean Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;

  --border-light: #f1f5f9;
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: #0284c7;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  --accent-primary: #0284c7;
  --accent-hover: #0369a1;
  --accent-light: #f0f9ff;
  --accent-ring: rgba(2, 132, 199, 0.25);

  --badge-bg: #f1f5f9;
  --badge-text: #475569;
  --badge-border: #e2e8f0;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 12px 24px -6px rgba(15, 23, 42, 0.08), 0 4px 8px -2px rgba(15, 23, 42, 0.03);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: #0f172a;
  --bg-card-hover: #131c33;

  --border-light: #1e293b;
  --border-subtle: #26334d;
  --border-strong: #334155;
  --border-focus: #38bdf8;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;

  --accent-primary: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-light: rgba(56, 189, 248, 0.1);
  --accent-ring: rgba(56, 189, 248, 0.3);

  --badge-bg: #1e293b;
  --badge-text: #cbd5e1;
  --badge-border: #334155;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 14px 28px -6px rgba(0, 0, 0, 0.6);
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  text-decoration: none;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* Focus Management */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

/* Layout Container */
.wrap {
  width: 100%;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 640px) {
  .wrap {
    padding-inline: 2rem;
  }
}

/* ==========================================================================
   Site Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

[data-theme="dark"] .site-header {
  background-color: rgba(9, 13, 22, 0.85);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.015em;
  transition: opacity var(--transition-fast);
}

.brand:hover {
  opacity: 0.85;
}

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .brand-monogram {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #090d16;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.75rem;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme Toggle Button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: block;
}

/* Mobile Menu Button */
.mobile-nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
}

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

.mobile-nav-menu {
  display: none;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  padding: 1rem 1.25rem;
}

.mobile-nav-menu.is-open {
  display: block;
}

.mobile-nav-menu a {
  display: block;
  padding: 0.65rem 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.mobile-nav-menu a:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding-block: 4rem 3rem;
  border-bottom: 1px solid var(--border-light);
  background: radial-gradient(circle at 50% 0%, var(--bg-secondary) 0%, var(--bg-primary) 70%);
}

@media (min-width: 768px) {
  .hero {
    padding-block: 5rem 3.5rem;
  }
}

.hero-eyebrow {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: 1.75rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 2rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 2.25rem;
  }
}

.hero-lead {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 0;
}

@media (min-width: 640px) {
  .hero-lead {
    font-size: 1.125rem;
  }
}

/* ==========================================================================
   Section Intro
   ========================================================================== */

.section {
  padding-block: 4rem;
}

@media (min-width: 768px) {
  .section {
    padding-block: 5rem;
  }
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

@media (min-width: 640px) {
  .section-title {
    font-size: 2.125rem;
  }
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 640px;
}

/* ==========================================================================
   Projects Grid (2 Columns on Desktop, 1 Column on Mobile)
   ========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card-hover);
}

.project-card__top {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.project-icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 8px -2px rgba(0, 0, 0, 0.08);
  background-color: var(--bg-secondary);
}

[data-theme="dark"] .project-icon {
  border-color: rgba(255, 255, 255, 0.12);
}

.project-header-info {
  flex: 1;
  min-width: 0;
}

.project-title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 0.35rem;
}

.project-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.platform-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.platform-pill svg {
  width: 12px;
  height: 12px;
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Card Actions */
.project-card__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
}

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

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-strong);
}

.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-store:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-strong);
  color: var(--accent-primary);
}

.btn-store svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ==========================================================================
   Site Footer
   ========================================================================== */

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
  padding-block: 2.5rem;
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .site-footer__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

/* ==========================================================================
   Legal Content Pages (Impressum & Datenschutz)
   ========================================================================== */

.legal-article {
  max-width: 760px;
  margin-inline: auto;
  padding-block: 3rem 5rem;
}

.legal-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-primary);
  text-decoration: none;
  margin-bottom: 1.25rem;
}

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

.legal-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.legal-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.legal-content h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.legal-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.legal-content p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.legal-content ul,
.legal-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.legal-content li {
  margin-bottom: 0.35rem;
}

.legal-content a {
  color: var(--accent-primary);
  text-decoration: underline;
}

.legal-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-block: 1.25rem;
}

.legal-box p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Print Stylesheet
   ========================================================================== */
@media print {
  .site-header,
  .site-footer,
  .theme-toggle,
  .mobile-nav-toggle,
  .btn {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  .wrap, .legal-article {
    max-width: 100% !important;
    padding: 0 !important;
  }

  a {
    text-decoration: underline;
    color: #000000 !important;
  }
}