:root {
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --accent: #22c55e;
  --accent-dark: #16a34a;
  --danger: #ef4444;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --input-bg: #0f172a;
  --nav-height: 60px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  padding-top: var(--nav-height);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 2rem;
  z-index: 100;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  white-space: nowrap;
}

.nav-links { display: flex; gap: 0.25rem; }

.nav-link {
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  transition: all 0.15s;
}

.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.nav-link.active { color: var(--accent); background: rgba(34,197,94,0.1); }

/* Layout */
.container { max-width: 800px; margin: 0 auto; padding: 2rem 1.5rem; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-header h1 { font-size: 1.75rem; }

h2 {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
  margin: 2rem 0 1rem;
}

/* Buttons */
.btn {
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s;
}

.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-dark); }

.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: #475569; }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}
.btn-danger:hover { background: rgba(239,68,68,0.1); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: #475569; }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label { font-size: 0.8rem; color: var(--muted); }

/* Einheit Card */
.einheit-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.einheit-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.badge-kraft { background: rgba(59,130,246,0.2); color: #60a5fa; }
.badge-ausdauer { background: rgba(34,197,94,0.2); color: var(--accent); }

.einheit-title { font-weight: 600; margin-bottom: 0.25rem; }
.einheit-meta { font-size: 0.8rem; color: var(--muted); }
.einheit-details { font-size: 0.85rem; color: var(--muted); margin-top: 0.5rem; }

/* Form */
.form-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.form-group { margin-bottom: 1.25rem; }
.form-group:last-child { margin-bottom: 0; }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="date"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.65rem 0.9rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus { border-color: var(--accent); }
select option { background: var(--card); }

/* Radio Tabs */
.radio-tabs { display: flex; gap: 0.5rem; }
.radio-tabs input[type="radio"] { display: none; }

.radio-tab-label {
  flex: 1;
  text-align: center;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  transition: all 0.15s;
  user-select: none;
}

.radio-tabs input[type="radio"]:checked + .radio-tab-label {
  background: rgba(34,197,94,0.15);
  border-color: var(--accent);
  color: var(--accent);
}

/* Übungsblock */
.uebung-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.uebung-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.uebung-header input { flex: 1; }

.sets-liste { display: flex; flex-direction: column; gap: 0.5rem; }

.set-zeile {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.set-nummer { color: var(--muted); min-width: 48px; font-size: 0.8rem; }

/* Filter */
.filter-tabs { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }

.filter-btn {
  padding: 0.45rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.15s;
}

.filter-btn.active { background: rgba(34,197,94,0.15); border-color: var(--accent); color: var(--accent); }
.filter-btn:hover:not(.active) { color: var(--text); border-color: #475569; }

/* Empty State */
.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  line-height: 2;
}

.empty-state a { color: var(--accent); }

/* Nav right (user info + logout) */
.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-user {
  font-size: 0.85rem;
  color: var(--muted);
  white-space: nowrap;
}

/* Auth Pages */
body.auth-page {
  padding-top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.auth-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 400px;
}

.auth-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin-bottom: 0.5rem;
}

.auth-title {
  font-size: 1.4rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 1.75rem;
}

.auth-fehler {
  background: rgba(239,68,68,0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
}

.auth-link {
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 1.25rem;
}

.auth-link a { color: var(--accent); text-decoration: none; }
.auth-link a:hover { text-decoration: underline; }

input[type="email"],
input[type="password"] {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.65rem 0.9rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}

input[type="email"]:focus,
input[type="password"]:focus { border-color: var(--accent); }

/* Loading */
.loading-state {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

/* Responsive */
@media (max-width: 600px) {
  .page-header h1 { font-size: 1.4rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .einheit-card { flex-direction: column; }
  .nav-user { display: none; }
}