:root {
    --bg:       #1a1c22;
    --surface:  #23262f;
    --border:   #3a3f50;
    --accent:   #6e9e5f;
    --accent2:  #8ebf7a;
    --warn:     #c47a2a;
    --text:     #dde3f0;
    --muted:    #7a8299;
    --input-bg: #2c303c;
    --header-bg:#2e4057;
    --result-bg:#1e3028;
    --total-bg: #2e4057;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, sans-serif;
    font-size: 14px;
    min-height: 100vh;
    padding: 24px 16px 48px;
  }

  .title-row {
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 4px;
  }

  h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent2);
    letter-spacing: 0.02em;
  }

  .mount-potential {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text);
    line-height: 1;
    white-space: nowrap;
  }

  .mount-potential-label {
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-right: 6px;
  }

  .subtitle {
    color: var(--muted);
    margin-bottom: 28px;
    font-size: 0.85rem;
  }

  /* ─── Tabs ─── */
  .tab-bar {
    display: flex;
    align-items: stretch;
    justify-content: space-between;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
  }
  .tab-bar-tabs { display: flex; gap: 4px; }
  .tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    color: var(--muted);
    padding: 8px 18px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 0;
    transition: color 0.15s, border-color 0.15s;
    transform: none !important;
  }
  .tab-btn:hover { color: var(--text); }
  .tab-btn.active { color: var(--accent2); border-bottom-color: var(--accent2); }

  .container { max-width: 860px; margin: 0 auto; }

  /* ─── Calculator table ─── */
  .calc-wrap { overflow-x: auto; margin-bottom: 20px; }

  table { border-collapse: collapse; width: 100%; }

  th {
    background: var(--header-bg);
    color: var(--text);
    padding: 9px 12px;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
    border: 1px solid var(--border);
  }

  td {
    border: 1px solid var(--border);
    padding: 5px 8px;
    vertical-align: middle;
  }

  .stat-name {
    font-weight: 600;
    color: var(--accent2);
    white-space: nowrap;
    padding-left: 12px;
    min-width: 110px;
  }

  input[type=number] {
    width: 80px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    padding: 5px 7px;
    font-size: 14px;
    text-align: center;
    outline: none;
    transition: border-color 0.15s;
  }
  input[type=number]:focus { border-color: var(--accent); }
  input[type=number]::-webkit-inner-spin-button { opacity: 0.4; }

  .derived {
    color: var(--muted);
    text-align: center;
    font-size: 0.85rem;
    min-width: 90px;
  }

  .avg-row td {
    background: var(--surface);
    color: var(--muted);
    font-size: 0.82rem;
    padding: 7px 12px;
    border-top: 2px solid var(--border);
  }
  .avg-row .stat-name { color: var(--muted); font-weight: 400; font-style: italic; }
  #avg-display { font-weight: 700; color: var(--accent2); }

  #btn-import {
    float: right;
    padding: 3px 9px;
    font-size: 0.72rem;
    font-weight: 600;
    background: var(--input-bg);
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: not-allowed;
    opacity: 0.5;
    transform: none !important;
    position: relative;
  }

  #import-tooltip {
    position: fixed;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 5px 10px;
    font-size: 0.78rem;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.12s ease, transform 0.12s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    z-index: 9999;
  }
  #import-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* ─── Buttons ─── */
  .btn-row { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }

  button {
    padding: 10px 22px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.15s, transform 0.1s;
  }
  button:active { transform: scale(0.97); }

  #btn-calc {
    background: var(--accent);
    color: #fff;
  }
  #btn-calc:hover { filter: brightness(1.15); }

  #btn-clear {
    background: var(--input-bg);
    color: var(--muted);
    border: 1px solid var(--border);
  }
  #btn-clear:hover { filter: brightness(1.2); }

  /* ─── Results ─── */
  #results { display: none; }

  .results-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent2);
    margin-bottom: 10px;
  }

  .result-table-wrap { overflow-x: auto; }

  #result-table th {
    background: var(--header-bg);
    font-size: 0.78rem;
  }

  #result-table td { background: var(--result-bg); }

  #result-table td:nth-child(1) { color: var(--accent2); font-weight: 600; text-align: left; }
  #result-table td:nth-child(2) { color: var(--muted); font-size: 0.82rem; }
  #result-table td:nth-child(3),
  #result-table td:nth-child(4) { text-align: center; font-weight: 700; }

  .total-row td {
    background: var(--total-bg) !important;
    font-weight: 700;
    color: #fff !important;
  }

  #warn-row { display: none; margin-top: 14px; }
  .warn-box {
    background: #2c200e;
    border: 1px solid var(--warn);
    border-radius: 6px;
    padding: 10px 14px;
    color: var(--warn);
    font-size: 0.87rem;
    font-style: italic;
  }

  .no-materials {
    color: var(--warn);
    padding: 14px 0;
    font-style: italic;
  }

  .loading-cell { text-align: center; color: var(--muted); padding: 20px; font-style: italic; }
  .spinner {
    display: inline-block;
    width: 14px; height: 14px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  .phase-header td {
    background: var(--header-bg) !important;
    color: var(--accent2);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 6px 12px;
    border-top: 2px solid var(--border);
  }

  .train-row td {
    background: #1e2a1a !important;
    color: #8ecf6a;
    font-weight: 600;
    font-style: italic;
    padding: 8px 12px;
    border-top: 2px solid var(--border);
  }

  /* ─── Multi-Gen Roadmap ─── */
  .roadmap-section { margin-top: 36px; }
  .roadmap-controls {
    display: flex;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 14px;
  }
  .roadmap-label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 0.88rem;
  }
  select.rm-select {
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    padding: 5px 7px;
    font-size: 14px;
    outline: none;
    cursor: pointer;
  }
  select.rm-select:focus { border-color: var(--accent); }
  input.rm-input { width: 90px; }
  .roadmap-table { border-collapse: collapse; width: 100%; }
  .roadmap-table th {
    background: var(--header-bg);
    color: var(--text);
    padding: 9px 12px;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
    border: 1px solid var(--border);
  }
  .roadmap-table td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    vertical-align: middle;
    background: var(--result-bg);
  }
  .roadmap-table td:first-child { color: var(--accent2); font-weight: 600; white-space: nowrap; }
  .gen-step-current td { background: #1e2a1a !important; }
  .gen-step-current td:first-child { color: #fff; }
  .roadmap-total td {
    background: var(--total-bg) !important;
    font-weight: 700;
    color: #fff !important;
    font-size: 0.85rem;
  }
  .tip-box {
    background: #1a2810;
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 10px 14px;
    color: var(--accent2);
    font-size: 0.87rem;
    margin-top: 12px;
  }
  .tier-selector {
    display: flex;
    gap: 4px;
    border-radius: 4px;
    border: none;
  }
  .tier-btn {
    background: var(--input-bg);
    border: none;
    border-radius: 4px;
    color: var(--muted);
    padding: 4px 10px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 0.1s, color 0.1s;
    font-family: inherit;
  }
  .tier-btn.active { background: var(--accent); color: #fff; }
  #tier-selector .tier-btn[data-slots="4"].active { background: #d73d8d; }
  #tier-selector .tier-btn[data-slots="5"].active { background: #ffe500; color: #1a1c22; }
  .tier-btn:hover:not(.active) { background: var(--header-bg); color: var(--text); }

  /* ─── Ignore Training toggle ─── */
  .toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--muted);
    user-select: none;
    padding: 10px 0;
  }
  .toggle-label input[type=checkbox] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
  }
  .toggle-track {
    display: inline-block;
    width: 36px;
    height: 20px;
    border-radius: 10px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    position: relative;
    transition: background 0.2s;
    flex-shrink: 0;
  }
  .toggle-thumb {
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--muted);
    top: 2px;
    left: 2px;
    transition: transform 0.2s, background 0.2s;
  }
  .toggle-label input:checked + .toggle-track { background: var(--accent); border-color: var(--accent); }
  .toggle-label input:checked + .toggle-track .toggle-thumb { transform: translateX(16px); background: #fff; }