:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --text: #16181c;
  --text-muted: #565c66;
  --accent: #2f6fed;
  --accent-dark: #1f4fbf;
  --border: #e3e5e9;
  --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141a;
    --bg-alt: #1a1d24;
    --text: #eceef1;
    --text-muted: #9aa0ab;
    --accent: #6d9bff;
    --accent-dark: #8fb0ff;
    --border: #2a2e37;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.brand img { width: 28px; height: 28px; border-radius: 7px; }

.nav-links { display: flex; gap: 1.5rem; font-size: 0.95rem; }
.nav-links a { color: var(--text-muted); }
.nav-links a:hover { color: var(--text); }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.hero {
  text-align: center;
  padding: 3rem 0 2.5rem;
}

.hero h1 {
  font-size: 2.6rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.hero p.tagline {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
}

.cta-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); text-decoration: none; }

.btn-secondary {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { text-decoration: none; border-color: var(--accent); }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin: 3.5rem 0;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.legal h1 {
  font-size: 1.9rem;
  margin-bottom: 0.25rem;
}

.legal .updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.legal h2 {
  font-size: 1.2rem;
  margin-top: 2.2rem;
}

.legal p, .legal li { color: var(--text-muted); }
.legal ul { padding-left: 1.2rem; }

.contact-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.75rem;
  margin: 1.5rem 0;
}

.contact-card h3 { margin-top: 0; }

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a { color: var(--text-muted); margin: 0 0.5rem; }

.library-header {
  margin-bottom: 2rem;
}

.library-header h1 {
  font-size: 1.9rem;
  margin: 0 0 0.4rem;
}

.library-header p {
  color: var(--text-muted);
  margin: 0;
}

.account-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.account-box h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.field-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

input[type="email"], input[type="password"], input[type="search"], select {
  font: inherit;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

input[type="email"], input[type="password"] {
  flex: 1;
  min-width: 180px;
}

.btn-plain {
  font: inherit;
  cursor: pointer;
  border: none;
}

.account-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.account-email {
  font-weight: 600;
}

.form-message {
  font-size: 0.85rem;
  margin-top: 0.6rem;
}

.form-message.error { color: #d1453b; }
.form-message.success { color: #1d9e75; }

.toolbar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.toolbar input[type="search"] { flex: 2; min-width: 200px; }
.toolbar select { flex: 1; min-width: 140px; }

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

.workout-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.workout-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.workout-card p.description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  flex: 1;
}

.badge-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-transform: capitalize;
}

.exercise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.exercise-list li {
  padding: 0.2rem 0;
  border-top: 1px solid var(--border);
}
.exercise-list li:first-child { border-top: none; }

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.send-status {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  padding: 3rem 1rem;
}