/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Colors — Light Mode */
  --color-bg: #ffffff;
  --color-surface: #faf7f4;
  --color-border: #f0ebe5;
  --color-text: #111111;
  --color-text-muted: #666666;
  --color-accent: #FF6B35;
  --color-accent-bg: #fff8f2;
  --color-badge-live-bg: #E8F5E9;
  --color-badge-live-text: #2E7D32;
  --color-badge-wip-bg: #FFF3E0;
  --color-badge-wip-text: #E65100;

  /* Typography */
  --font-stack: -apple-system, "SF Pro Display", "Helvetica Neue", sans-serif;

  /* Spacing */
  --content-max-width: 860px;
  --section-padding: 48px 40px;
  --nav-height: 60px;

  /* Radius */
  --radius-card: 16px;
  --radius-btn: 8px;
  --radius-badge: 20px;

  /* Transitions */
  --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Dark Mode overrides */
[data-theme="dark"] {
  --color-bg: #0f0f0f;
  --color-surface: #1a1a1a;
  --color-border: #2a2a2a;
  --color-text: #f0f0f0;
  --color-text-muted: #888888;
  --color-accent: #FF7A45;
  --color-accent-bg: #1f1208;
  --color-badge-live-bg: #1a2e1b;
  --color-badge-live-text: #66BB6A;
  --color-badge-wip-bg: #2e1f08;
  --color-badge-wip-text: #FFA726;
}

/* System dark mode (applies when no data-theme override) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0f0f0f;
    --color-surface: #1a1a1a;
    --color-border: #2a2a2a;
    --color-text: #f0f0f0;
    --color-text-muted: #888888;
    --color-accent: #FF7A45;
    --color-accent-bg: #1f1208;
    --color-badge-live-bg: #1a2e1b;
    --color-badge-live-text: #66BB6A;
    --color-badge-wip-bg: #2e1f08;
    --color-badge-wip-text: #FFA726;
  }
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  font-family: var(--font-stack);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: var(--transition-theme);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Focus indicators — WCAG 2.1 AA */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-padding);
}

.divider {
  height: 1px;
  background: var(--color-border);
  margin: 0 40px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-theme);
}

[data-theme="dark"] .site-nav {
  background: rgba(15, 15, 15, 0.85);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-nav {
    background: rgba(15, 15, 15, 0.85);
  }
}

.site-nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.5px;
  color: var(--color-text);
  text-decoration: none;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text-muted);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language toggle */
.lang-toggle {
  display: flex;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-badge);
  overflow: hidden;
  font-size: 12px;
  font-weight: 600;
}

.lang-toggle a,
.lang-toggle span {
  padding: 4px 10px;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.lang-toggle .lang-active {
  background: var(--color-accent);
  color: #fff;
}

/* Dark mode toggle button */
.theme-toggle {
  background: none;
  border: 1.5px solid var(--color-border);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: border-color 0.2s, color 0.2s;
  font-size: 16px;
}

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

/* Mobile nav */
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  font-size: 20px;
}

/* Mobile nav open state */
.nav-links.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-bg);
  padding: 12px 20px 20px;
  border-bottom: 1px solid var(--color-border);
  z-index: 99;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  background: linear-gradient(160deg, var(--color-accent-bg) 0%, var(--color-bg) 60%);
}

.hero .container {
  padding-top: 64px;
  padding-bottom: 56px;
  display: flex;
  gap: 40px;
  align-items: center;
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.hero-text h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--color-text);
  line-height: 1.15;
  margin-bottom: 12px;
}

.hero-text h1 .hero-name {
  color: var(--color-accent);
}

.hero-tagline {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 440px;
}

.hero-ctas {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1.5px solid var(--color-border);
  display: inline-block;
  transition: border-color 0.2s;
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

/* App Store button */
.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-text);
  color: var(--color-bg);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s;
  margin-top: 12px;
}

.btn-appstore:hover {
  opacity: 0.85;
  text-decoration: none;
}

/* ============================================================
   SECTION LABELS
   ============================================================ */
.section-label {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  color: var(--color-text);
}

/* ============================================================
   PROJECT CARDS
   ============================================================ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.project-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 24px;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.app-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  margin-bottom: 16px;
  object-fit: cover;
}

/* CSS-only icon fallbacks */
.app-icon-toothli {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #4FC3F7, #0288D1);
  margin-bottom: 16px;
  flex-shrink: 0;
}

.app-icon-game {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #FF6B35, #FF9A4D);
  margin-bottom: 16px;
  flex-shrink: 0;
}

.project-type {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 4px;
}

.project-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.project-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}

.project-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-badge);
}

.badge-live {
  background: var(--color-badge-live-bg);
  color: var(--color-badge-live-text);
}

.badge-wip {
  background: var(--color-badge-wip-bg);
  color: var(--color-badge-wip-text);
}

/* Cards hover (motion-safe only) */
@media (prefers-reduced-motion: no-preference) {
  .project-card {
    transition: box-shadow 0.2s, transform 0.2s;
  }

  .project-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
  }
}

/* ============================================================
   PAGE HEADERS (inner pages)
   ============================================================ */
.page-header {
  padding: 48px 40px 32px;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-block {
  margin-bottom: 32px;
}

.contact-label {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-email {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.social-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 0.2s;
}

.social-link:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

/* ============================================================
   LEGAL PAGES (Impressum, Datenschutz)
   ============================================================ */
.legal-content {
  max-width: 640px;
  line-height: 1.7;
}

.legal-content h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 12px;
}

.legal-content p {
  margin-bottom: 12px;
  color: var(--color-text-muted);
}

.legal-content address {
  font-style: normal;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  padding: 28px 40px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ============================================================
   PAGE LOAD ANIMATION (motion-safe)
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .animate-in {
    animation: fadeUp 0.5s ease forwards;
    opacity: 0;
  }

  .animate-in:nth-child(1) { animation-delay: 0.05s; }
  .animate-in:nth-child(2) { animation-delay: 0.15s; }
  .animate-in:nth-child(3) { animation-delay: 0.25s; }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

/* ============================================================
   RESPONSIVE — Mobile (≤768px)
   ============================================================ */
@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .section {
    padding: 36px 20px;
  }

  .divider {
    margin: 0 20px;
  }

  /* Nav: hide links, show hamburger */
  .nav-links {
    display: none;
  }

  .nav-mobile-toggle {
    display: block;
  }

  /* Hero: stack vertically */
  .hero .container {
    flex-direction: column;
    padding: 40px 20px;
    text-align: center;
  }

  .hero-tagline {
    max-width: 100%;
  }

  .hero-ctas {
    justify-content: center;
  }

  /* Cards: single column */
  .project-grid {
    grid-template-columns: 1fr;
  }

  /* Footer: stack */
  .site-footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
    padding: 24px 20px;
  }
}