:root {
    --bg: #0f1115;
    --card: #171a21;
    --accent: #ff6a3d;
    --accent2: #3ddc97;
    --text: #eef0f3;
    --muted: #8a8f98;
    --border: #262a33;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding: 16px;
    padding-bottom: 40px;
  }
  h1 { font-size: 1.3rem; margin: 0 0 4px; }
  .sub { color: var(--muted); font-size: 0.85rem; margin-bottom: 14px; }

  .main-nav {
    display: flex;
    gap: 6px;
    margin-bottom: 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
  }
  .main-nav-btn {
    flex: 1;
    text-align: center;
    padding: 9px 6px;
    border-radius: 7px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
  }
  .main-nav-btn.active {
    background: var(--accent);
    color: #fff;
  }

  .progress-wrap {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 14px;
  }
  .progress-bar-bg {
    background: #262a33;
    border-radius: 6px;
    height: 8px;
    overflow: hidden;
    margin-top: 6px;
  }
  .progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    width: 0%;
    transition: width 0.3s ease;
  }
  .tabs {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 6px;
    margin-bottom: 12px;
  }
  .tab {
    flex: 0 0 auto;
    padding: 8px 12px;
    border-radius: 8px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.8rem;
    cursor: pointer;
    white-space: nowrap;
  }
  .tab.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    font-weight: 600;
  }
  .day-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 2px;
  }
  .day-focus {
    color: var(--accent2);
    font-size: 0.8rem;
    margin-bottom: 12px;
  }
  .exercise {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
  }
  .exercise input {
    margin-top: 3px;
    width: 18px;
    height: 18px;
    accent-color: var(--accent2);
    flex-shrink: 0;
  }
  .exercise.checked { opacity: 0.5; }
  .exercise.checked .ex-name { text-decoration: line-through; }
  .ex-name { font-weight: 600; font-size: 0.92rem; }
  .ex-sets { color: var(--muted); font-size: 0.78rem; margin-top: 2px; }
  .video-link {
    display: inline-block;
    margin-top: 6px;
    color: var(--accent);
    font-size: 0.75rem;
    text-decoration: none;
    font-weight: 600;
  }
  .video-link:active { opacity: 0.7; }
  .cardio-note {
    background: rgba(61,220,151,0.08);
    border: 1px solid rgba(61,220,151,0.25);
    border-radius: 10px;
    padding: 10px 12px;
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--accent2);
  }
  .reset-btn {
    margin-top: 16px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.78rem;
    cursor: pointer;
    width: 100%;
  }

  /* Shared card/section styles */
  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 12px;
  }
  .card-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 10px;
  }
  .field-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
  }
  .field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .field label {
    font-size: 0.72rem;
    color: var(--muted);
  }
  .field input, .field select {
    background: #1e222b;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 7px;
    padding: 8px;
    font-size: 0.85rem;
  }
  .btn {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
  }
  .btn.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    font-weight: 600;
    margin-top: 6px;
  }
  .stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 10px;
  }
  .stat-box {
    background: #1e222b;
    border-radius: 8px;
    padding: 10px;
    text-align: center;
  }
  .stat-box .val {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent2);
  }
  .stat-box .lbl {
    font-size: 0.68rem;
    color: var(--muted);
    margin-top: 2px;
  }
  .log-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
    font-size: 0.82rem;
  }
  .log-entry:last-child { border-bottom: none; }
  .log-entry .date { color: var(--muted); font-size: 0.72rem; }
  .log-entry .del {
    color: var(--muted);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 2px 6px;
  }
  .chart-wrap {
    background: #1e222b;
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 10px;
  }
  .empty-note {
    color: var(--muted);
    font-size: 0.8rem;
    text-align: center;
    padding: 10px;
  }
  .deficit-note {
    background: rgba(255,106,61,0.08);
    border: 1px solid rgba(255,106,61,0.25);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 0.78rem;
    color: #ffb08a;
    margin-top: 8px;
  }