:root {
    --sea-blue: #0C2933;
    --sea-blue-85: #2B3C45;
    --cool-blue: #4FA4DB;
    --warm-orange: #F68B1F;
    --white: #ffffff;
    --text-muted: #8aa0a8;
    --border: rgba(79,164,219,0.18);
    --panel-bg: #1a343f;
    --section-bg: rgba(12,41,51,0.7);
    --success: #4ade80;
    --font: 'Host Grotesk', sans-serif;
  }

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

  body {
    font-family: var(--font);
    background: var(--sea-blue);
    color: var(--white);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  /* ── HEADER ── */
  header {
    background: #ffffff;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    border-bottom: 1px solid #e8ecee;
    height: 56px;
    flex-shrink: 0;
  }

  .logo-mark {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }

  /* SVG logo icon */
  .logo-svg {
    width: 44px;
    height: 36px;
    flex-shrink: 0;
  }

  .logo-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    line-height: 1.2;
    letter-spacing: -0.01em;
  }
  .logo-text span { color: var(--warm-orange); }

  .header-divider {
    width: 1px;
    height: 28px;
    background: var(--border);
    margin: 0 4px;
    flex-shrink: 0;
  }

  .header-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--sea-blue);
    opacity: 1;
  }
  .header-sub {
    font-size: 11px;
    color: #6b8a96;
    margin-top: 1px;
    font-weight: 400;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .badge-view { background: #eef6fb; color: var(--sea-blue); border: 1px solid var(--cool-blue); }
  .badge-draw { background: var(--warm-orange); color: var(--white); border: 1px solid var(--warm-orange); }

  /* ── MAIN LAYOUT ── */
  .main { display: flex; flex: 1; overflow: hidden; }

  /* ── SIDE PANEL ── */
  .panel {
    width: 296px;
    background: var(--panel-bg);
    padding: 12px;
    overflow-y: auto;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--sea-blue-85) transparent;
  }
  .panel::-webkit-scrollbar { width: 4px; }
  .panel::-webkit-scrollbar-track { background: transparent; }
  .panel::-webkit-scrollbar-thumb { background: var(--sea-blue-85); border-radius: 2px; }

  .section {
    background: var(--section-bg);
    border-radius: 8px;
    padding: 12px;
    border: 1px solid var(--border);
  }

  .section h3 {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--cool-blue);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .section h3 svg { width: 12px; height: 12px; opacity: 0.8; }

  label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    display: block;
    margin-bottom: 3px;
    margin-top: 9px;
  }
  label:first-of-type { margin-top: 2px; }

  input, select {
    width: 100%;
    background: rgba(12,41,51,0.8);
    border: 1px solid var(--border);
    color: var(--white);
    padding: 7px 10px;
    border-radius: 5px;
    font-size: 12px;
    font-family: var(--font);
    font-weight: 400;
    transition: border-color 0.15s;
    -webkit-appearance: none;
  }
  input:focus, select:focus {
    outline: none;
    border-color: var(--cool-blue);
    background: rgba(12,41,51,1);
  }
  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%234FA4DB'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
    cursor: pointer;
  }
  select option { background: var(--sea-blue); color: var(--white); }

  /* ── BUTTONS ── */
  .btn {
    width: 100%;
    padding: 9px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font);
    margin-top: 6px;
    transition: opacity .15s, transform .1s;
    letter-spacing: 0.01em;
  }
  .btn:hover { opacity: .88; transform: translateY(-1px); }
  .btn:active { transform: translateY(0); }

  .btn-primary {
    background: var(--warm-orange);
    color: white;
  }
  .btn-secondary {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
  }
  .btn-secondary:hover { color: var(--white); border-color: var(--cool-blue); }
  .btn-danger {
    background: transparent;
    color: #f87171;
    border: 1px solid rgba(248,113,113,0.25);
  }
  .btn-danger:hover { background: rgba(248,113,113,0.1); }

  /* ── RESULTS ── */
  .result-box {
    background: rgba(12,41,51,0.8);
    border-radius: 6px;
    padding: 10px;
    margin-top: 8px;
    border: 1px solid var(--border);
  }

  .result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
    border-bottom: 1px solid rgba(79,164,219,0.1);
    font-size: 11px;
    color: #6b8a96;
  }
  .result-row:last-child { border: none; }
  .result-val { color: var(--cool-blue); font-weight: 600; font-size: 12px; }
  .result-total {
    color: var(--warm-orange);
    font-size: 15px;
    font-weight: 700;
  }

  /* ── STEP INDICATOR ── */
  .step-indicator { display: flex; gap: 4px; margin-bottom: 2px; }
  .step {
    flex: 1;
    text-align: center;
    padding: 5px 3px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 500;
    background: rgba(12,41,51,0.6);
    color: var(--text-muted);
    border: 1px solid var(--border);
    transition: all 0.2s;
  }
  .step.active {
    background: var(--warm-orange);
    color: white;
    border-color: var(--warm-orange);
    font-weight: 700;
  }
  .step.done {
    background: rgba(74,222,128,0.12);
    color: #4ade80;
    border-color: rgba(74,222,128,0.3);
  }

  /* ── TOGGLE ── */
  .toggle-row { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
  .toggle-label { font-size: 11px; color: var(--text-muted); font-weight: 500; }
  .toggle-group {
    display: flex;
    background: rgba(12,41,51,0.8);
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid var(--border);
  }
  .toggle-opt {
    padding: 5px 11px;
    font-size: 11px;
    font-family: var(--font);
    cursor: pointer;
    color: var(--text-muted);
    font-weight: 500;
    transition: all .15s;
    user-select: none;
  }
  .toggle-opt.selected {
    background: var(--cool-blue);
    color: white;
    font-weight: 700;
  }

  /* ── SEGMENT LIST ── */
  .segment-list { max-height: 150px; overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--sea-blue-85) transparent; }
  .seg-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 8px;
    background: rgba(12,41,51,0.6);
    border-radius: 5px;
    margin-bottom: 4px;
    font-size: 11px;
    border: 1px solid var(--border);
    color: var(--white);
  }
  .seg-del {
    background: none;
    border: none;
    color: #f87171;
    cursor: pointer;
    font-size: 13px;
    padding: 0 2px;
    line-height: 1;
    font-family: var(--font);
  }

  /* ── MAP ── */
  .map-container { flex: 1; position: relative; overflow: hidden; }
  #map { width: 100%; height: 100%; }

  .map-controls {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    z-index: 1000;
  }
  .map-btn {
    background: var(--sea-blue-85);
    border: 1px solid var(--border);
    color: var(--white);
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 11px;
    font-family: var(--font);
    font-weight: 600;
    transition: all .2s;
    white-space: nowrap;
    letter-spacing: 0.02em;
    backdrop-filter: blur(4px);
  }
  .map-btn:hover { background: var(--panel-bg); border-color: var(--cool-blue); color: var(--cool-blue); }
  .map-btn.active { background: var(--warm-orange); border-color: var(--warm-orange); color: white; }

  /* ── INFO BAR ── */
  .info-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(12,41,51,0.92);
    backdrop-filter: blur(6px);
    padding: 7px 16px;
    font-size: 11px;
    color: #6b8a96;
    display: flex;
    gap: 20px;
    z-index: 1000;
    border-top: 1px solid var(--border);
    font-weight: 400;
  }
  .info-bar span span { color: var(--cool-blue); font-weight: 600; }

  /* ── HINT TEXT ── */
  .hint-text { font-size: 10px; color: var(--text-muted); margin-top: 6px; line-height: 1.4; font-weight: 400; }

  /* Leaflet overrides */
  .leaflet-popup-content-wrapper {
    background: var(--sea-blue-85);
    color: var(--white);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: var(--font);
  }
  .leaflet-popup-tip { background: var(--sea-blue-85); }
  .leaflet-control-zoom a {
    background: var(--sea-blue-85) !important;
    color: var(--white) !important;
    border-color: var(--border) !important;
    font-family: var(--font) !important;
  }
  .leaflet-control-zoom a:hover { background: var(--panel-bg) !important; color: var(--cool-blue) !important; }
  .leaflet-control-attribution { background: rgba(12,41,51,0.8) !important; color: var(--text-muted) !important; font-family: var(--font) !important; }
  .leaflet-control-attribution a { color: var(--cool-blue) !important; }

  /* ── SAVED CALCULATIONS ── */
  .saved-item { align-items: stretch; gap: 6px; }
  .saved-open {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: transparent;
    border: none;
    padding: 2px 0;
    text-align: left;
    cursor: pointer;
    font-family: var(--font);
    min-width: 0;
  }
  .saved-name {
    font-size: 11.5px;
    font-weight: 600;
    color: var(--white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .saved-open:hover .saved-name { color: var(--warm-orange); }
  .saved-meta { font-size: 10px; color: var(--cool-blue); font-weight: 500; }

  /* ── MODAL ── */
  .modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(12,41,51,.85);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
  }
  .modal-card {
    background: var(--panel-bg);
    border: 1px solid rgba(79,164,219,.25);
    border-radius: 10px;
    padding: 24px;
    width: 520px;
    max-width: 100%;
  }
  .modal-card h3 {
    color: var(--warm-orange);
    margin-bottom: 14px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
  }
  .modal-card textarea {
    width: 100%;
    height: 300px;
    background: var(--sea-blue);
    color: #cde4ee;
    border: 1px solid rgba(79,164,219,.2);
    border-radius: 6px;
    padding: 12px;
    font-family: var(--font-code, monospace);
    font-size: 11.5px;
    resize: vertical;
    line-height: 1.6;
  }
  .modal-actions { display: flex; gap: 8px; }
  .modal-actions .btn { flex: 1; margin-top: 12px; }

  /* ── TOASTS ── */
  #toastHost {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    pointer-events: none;
  }
  .toast {
    background: var(--panel-bg);
    color: var(--white);
    border: 1px solid var(--cool-blue);
    border-left: 3px solid var(--success);
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 12px;
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0,0,0,.35);
    animation: toast-in .18s ease-out;
    max-width: 90vw;
  }
  .toast-error { border-left-color: #f87171; }
  @keyframes toast-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 860px) {
    body { height: auto; overflow: auto; }
    .main { flex-direction: column; }
    .panel { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
    .map-container { height: 70vh; min-height: 380px; }
    header { height: auto; padding: 10px 14px; flex-wrap: wrap; gap: 10px; }
  }