/* ============================================
   DEUTSCH LERNEN — Global Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --primary: #0D6E6E;
  --primary-light: #1a9e9e;
  --primary-dark: #0a5555;
  --accent: #C9A84C;
  --accent-light: #e0c36a;
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-light: #6c757d;
  --success: #28a745;
  --danger: #dc3545;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --border: #334155;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  font-size: inherit;
}

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

/* ---- Navigation ---- */
.navbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: rgba(13, 110, 110, 0.08);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: transparent;
  color: var(--text-light);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

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

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  color: var(--text);
  font-size: 1.4rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

/* ---- Layout ---- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.page-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--text-light);
  font-size: 1.05rem;
}

/* ---- Topic Grid ---- */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.topic-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.topic-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: var(--primary);
}

.topic-card .card-icon {
  font-size: 2rem;
  width: 52px;
  height: 52px;
  background: rgba(13, 110, 110, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.topic-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.topic-card .card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-light);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-a1 {
  background: rgba(13, 110, 110, 0.12);
  color: var(--primary);
}

.badge-a2 {
  background: rgba(201, 168, 76, 0.15);
  color: var(--accent);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
  min-height: 44px;
  min-width: 44px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

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

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

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

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* ---- Progress Bar ---- */
.progress-bar-container {
  background: var(--border);
  border-radius: 100px;
  height: 8px;
  overflow: hidden;
  margin: 1rem 0;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 100px;
  transition: width 0.5s ease;
}

/* ---- Speaker Button ---- */
.speak-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(13, 110, 110, 0.1);
  color: var(--primary);
  font-size: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

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

/* ---- Utilities ---- */
.text-center { text-align: center; }
.text-light { color: var(--text-light); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--card-bg);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-hamburger {
    display: flex;
  }

  .page-header h1 {
    font-size: 1.5rem;
  }

  .topic-grid {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 1.25rem 1rem;
  }
}