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

    :root {
      --bg: #f8fafc;
      --card-bg: #ffffff;
      --card-border: #e2e8f0;
      --ink: #0f172a;
      --ink-secondary: #334155;
      --muted: #64748b;
      --border: #cbd5e1;
      --border-focus: #2563eb;
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-soft: #eff6ff;
      --primary-text: #1d4ed8;
      --title-color: #1d4ed8;
      --subtitle-color: #334155;
      --green: #16a34a;
      --green-soft: #f0fdf4;
      --green-border: #86efac;
      --green-text: #15803d;
      --amber: #d97706;
      --amber-soft: #fffbeb;
      --amber-border: #fcd34d;
      --amber-text: #b45309;
      --red: #dc2626;
      --red-soft: #fef2f2;
      --red-border: #fca5a5;
      --red-text: #b91c1c;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --radius-lg: 16px;
      --radius-md: 10px;
      --radius-sm: 6px;
    }

    [data-theme="dark"] {
      --bg: #090d16;
      --card-bg: #131b2e;
      --card-border: #1e293b;
      --ink: #f1f5f9;
      --ink-secondary: #cbd5e1;
      --muted: #94a3b8;
      --border: #334155;
      --border-focus: #3b82f6;
      --primary: #3b82f6;
      --primary-hover: #60a5fa;
      --primary-soft: #1e293b;
      --primary-text: #93c5fd;
      --title-color: #60a5fa;
      --subtitle-color: #94a3b8;
      --green: #22c55e;
      --green-soft: #052e16;
      --green-border: #15803d;
      --green-text: #86efac;
      --amber: #f59e0b;
      --amber-soft: #451a03;
      --amber-border: #92400e;
      --amber-text: #fde68a;
      --red: #ef4444;
      --red-soft: #450a0a;
      --red-border: #991b1b;
      --red-text: #fca5a5;
      --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
      --shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.4);
    }

    html, body {
      margin: 0;
      min-height: 100%;
      background: var(--bg);
      color: var(--ink);
      font-family: 'Google Sans Flex', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      -webkit-font-smoothing: antialiased;
      transition: background-color 0.2s ease, color 0.2s ease;
      padding-bottom: 16px;
    }

    button, input, select { font: inherit; }
    button { -webkit-tap-highlight-color: transparent; }

    .app {
      width: min(100%, 820px);
      margin: 0 auto;
      padding: 20px 18px 36px;
      transition: width 0.25s ease, padding 0.25s ease;
    }

    /* Window Controls Overlay (Seamless Borderless Titlebar on Windows PWA) */
    @media (display-mode: window-controls-overlay) {
      .app-header {
        padding-top: calc(env(titlebar-area-y, 0px) + 8px);
        padding-left: calc(env(titlebar-area-x, 0px) + 12px);
        padding-right: calc(100vw - env(titlebar-area-width, 100vw) - env(titlebar-area-x, 0px) + 12px);
        min-height: env(titlebar-area-height, 44px);
        app-region: drag;
        -webkit-app-region: drag;
      }
      .brand, .header-actions, .header-actions button, a, button, input, select {
        app-region: no-drag;
        -webkit-app-region: no-drag;
      }
    }

    /* Header */
    .app-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 0 0 16px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-icon {
      width: 44px;
      height: 44px;
      flex: 0 0 44px;
      border-radius: 12px;
      background: transparent;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.22);
    }

    .brand-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      border-radius: 12px;
    }

    .brand-title-wrap {
      display: flex;
      flex-direction: column;
    }

    .brand h1 {
      margin: 0;
      font-size: 25px;
      line-height: 1.15;
      letter-spacing: -0.5px;
      font-weight: 850;
      color: var(--title-color);
    }

    .brand p {
      margin: 3px 0 0;
      color: var(--subtitle-color);
      font-size: 12.5px;
      font-weight: 600;
      letter-spacing: 0.1px;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .icon-btn {
      min-height: 40px;
      padding: 0 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      color: var(--ink);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 13.5px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      transition: all 0.15s ease;
    }

    .icon-btn:hover {
      background: var(--primary-soft);
      border-color: var(--border-focus);
    }

    .icon-btn.active {
      background: var(--primary-soft);
      border-color: var(--primary);
      color: var(--primary-text);
    }

    /* Main Navigation Tabs (shadcn/ui style) */
    .nav-tabs {
      display: flex;
      background: var(--card-border);
      padding: 4px;
      border-radius: var(--radius-md);
      gap: 4px;
      margin-bottom: 18px;
    }

    .nav-tab-btn {
      flex: 1;
      padding: 9px 16px;
      border: none;
      background: transparent;
      color: var(--muted);
      font-size: 14px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.15s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .nav-tab-btn.active {
      background: var(--card-bg);
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    /* Quick Chips Bar */
    .chips-section {
      margin-bottom: 16px;
    }

    .chips-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .chips-actions {
      display: flex;
      align-items: center;
      gap: 6px;
      text-transform: none;
      font-size: 11.5px;
      letter-spacing: 0;
    }

    .chip-action-link {
      background: none;
      border: none;
      padding: 0 4px;
      color: var(--primary);
      font-weight: 700;
      cursor: pointer;
      text-decoration: underline;
      transition: opacity 0.15s ease;
    }

    .chip-action-link:hover {
      opacity: 0.8;
    }

    .chip-action-link.text-red {
      color: var(--red-text);
    }

    .chips-scroll {
      display: flex;
      gap: 8px;
      overflow-x: auto;
      padding: 2px 2px 8px;
      scrollbar-width: thin;
    }

    .chip-btn {
      flex: 0 0 auto;
      padding: 7px 14px;
      border: 1px solid var(--border);
      border-radius: 20px;
      background: var(--card-bg);
      color: var(--ink-secondary);
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      white-space: nowrap;
      transition: all 0.15s ease;
    }

    .chip-btn:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-soft);
    }

    .chip-btn.active {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    }

    /* Main Calculator Card */
    .calculator-card, .reference-card {
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 20px 22px 24px;
      background: var(--card-bg);
      box-shadow: var(--shadow-md);
    }

    .field {
      margin-bottom: 18px;
    }

    .field:last-of-type {
      margin-bottom: 0;
    }

    .field-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 7px;
    }

    .field label {
      display: block;
      color: var(--ink);
      font-size: 13px;
      letter-spacing: 0.4px;
      font-weight: 700;
      text-transform: uppercase;
    }

    .field-aux-action {
      font-size: 12px;
      color: var(--primary);
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
      font-weight: 600;
      text-decoration: underline;
    }

    .input-wrap, .select-wrap {
      position: relative;
      display: flex;
      align-items: center;
    }

    .input-wrap input, .select-wrap select {
      width: 100%;
      height: 52px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      color: var(--ink);
      outline: none;
      font-size: 17px;
      font-weight: 600;
      padding: 0 46px 0 44px;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }

    .input-wrap input:focus, .select-wrap select:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3.5px rgba(37, 99, 235, 0.16), 0 1px 2px rgba(0, 0, 0, 0.05);
    }

    .field-icon {
      position: absolute;
      z-index: 2;
      left: 14px;
      color: var(--muted);
      font-size: 18px;
      pointer-events: none;
      display: grid;
      place-items: center;
    }

    .unit {
      position: absolute;
      right: 14px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 600;
      pointer-events: none;
    }

    .select-wrap::after {
      content: "⌄";
      position: absolute;
      right: 14px;
      color: var(--muted);
      font-size: 20px;
      font-weight: 800;
      pointer-events: none;
    }

    .select-wrap select {
      appearance: none;
      padding-right: 38px;
      cursor: pointer;
    }

    /* Stepper Buttons for Weight */
    .weight-row {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 8px;
    }

    .steppers {
      display: flex;
      gap: 5px;
    }

    .step-btn {
      height: 52px;
      padding: 0 12px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      color: var(--ink);
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.12s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .step-btn:hover {
      background: var(--primary-soft);
      border-color: var(--border-focus);
      color: var(--primary);
    }

    .step-btn:active, .chip-btn:active, .icon-btn:active, .copy-rx-btn:active, .use-weight-btn:active {
      transform: scale(0.95);
    }

    /* Medication Row with Star */
    .medication-row {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .medication-row .select-wrap {
      flex: 1;
    }

    .global-star {
      height: 52px;
      width: 52px;
      flex: 0 0 52px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      font-size: 24px;
      color: var(--muted);
      cursor: pointer;
      display: grid;
      place-items: center;
      transition: all 0.15s ease;
    }

    .global-star:hover {
      border-color: #f59e0b;
      background: #fffbeb;
    }

    /* Drug Search Box */
    .search-wrap {
      position: relative;
      margin-bottom: 8px;
    }

    .search-input {
      width: 100%;
      height: 42px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      color: var(--ink);
      font-size: 14px;
      padding: 0 12px 0 36px;
      outline: none;
      transition: border-color 0.15s ease;
    }

    .search-input:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12);
    }

    .search-icon {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--muted);
      font-size: 14px;
      pointer-events: none;
    }

    /* Result Card */
    .result-card {
      margin-top: 18px;
      padding: 20px;
      border: 1.5px solid var(--green-border);
      border-radius: var(--radius-lg);
      background: var(--green-soft);
      transition: all 0.2s ease;
    }

    .result-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      flex-wrap: wrap;
    }

    .result-title {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--green-text);
      font-size: 15px;
      font-weight: 800;
      letter-spacing: 0.3px;
    }

    .result-icon {
      width: 26px;
      height: 26px;
      border-radius: 7px;
      background: var(--green);
      color: #fff;
      display: grid;
      place-items: center;
      font-size: 15px;
      font-weight: 800;
    }

    .rx-btn-group {
      display: flex;
      gap: 6px;
      align-items: center;
      flex-wrap: wrap;
    }

    .copy-rx-btn {
      padding: 7px 14px;
      border: 1px solid var(--green-border);
      border-radius: 8px;
      background: #ffffff;
      color: var(--green-text);
      font-size: 12.5px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
      transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    }

    [data-theme="dark"] .copy-rx-btn {
      background: #1e293b;
    }

    .copy-rx-btn:hover {
      background: var(--green);
      color: #ffffff;
      border-color: var(--green);
    }

    .copy-rx-btn.copied {
      background: var(--green) !important;
      color: #ffffff !important;
      border-color: var(--green) !important;
    }



    @keyframes numPop {
      0% { transform: scale(0.96); opacity: 0.75; }
      100% { transform: scale(1); opacity: 1; }
    }

    .num-animate {
      animation: numPop 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    }

    /* Clinic Dispensing Box */
    .dispensing-box {
      margin-top: 14px;
      padding: 12px 14px;
      border: 1.5px dashed var(--green-border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
    }

    .dispensing-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 8px;
    }

    .dispensing-title {
      font-size: 11px;
      font-weight: 800;
      color: var(--green-text);
      letter-spacing: 0.5px;
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 5px;
    }

    .duration-chips {
      display: flex;
      gap: 4px;
    }

    .dur-chip {
      padding: 3px 9px;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: var(--bg);
      color: var(--ink-secondary);
      font-size: 11.5px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.12s ease;
    }

    .dur-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .dur-chip.active {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .dispense-result {
      font-size: 13.5px;
      color: var(--ink);
      font-weight: 500;
      line-height: 1.4;
    }

    .dispense-result strong {
      color: var(--green-text);
      font-weight: 800;
    }

    .result-main {
      display: grid;
      grid-template-columns: 1.2fr 1px 1fr;
      align-items: center;
      margin: 16px 0 14px;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 16px 12px;
      border: 1px solid var(--green-border);
    }

    .dose-block {
      text-align: center;
      padding: 0 12px;
    }

    .result-label {
      display: block;
      color: var(--muted);
      font-size: 12px;
      font-weight: 750;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .dose-block strong {
      display: block;
      color: var(--green-text);
      font-size: 30px;
      line-height: 1.1;
      font-weight: 800;
    }

    .dose-block .vol-tag {
      display: inline-block;
      color: var(--ink);
      font-size: 19px;
      font-weight: 700;
      margin-top: 4px;
    }

    .dose-block .syringe-hint {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: var(--primary);
      background: var(--primary-soft);
      border: 1px solid rgba(37, 99, 235, 0.25);
      border-radius: 12px;
      padding: 2px 8px;
      font-size: 11.5px;
      font-weight: 700;
      margin-top: 5px;
    }

    .dose-block strong.frequency {
      font-size: 20px;
      line-height: 1.2;
      color: var(--ink);
    }

    #frequencySub {
      color: var(--muted);
      font-size: 13px;
      font-weight: 500;
      margin-top: 3px;
    }

    .result-divider {
      width: 1px;
      height: 70px;
      background: var(--border);
    }

    /* Alert Banner (Capping / Precautions) */
    .safety-alert {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 14px;
      border: 1px solid var(--amber-border);
      border-radius: var(--radius-md);
      background: var(--amber-soft);
      color: var(--amber-text);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .contra-alert {
      border-color: var(--red-border);
      background: var(--red-soft);
      color: var(--red-text);
    }

    .calculation-box {
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      padding: 12px 14px;
      color: var(--ink-secondary);
      font-size: 13.5px;
      line-height: 1.5;
    }

    .calculation-box strong {
      display: block;
      color: var(--muted);
      font-size: 11px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 2px;
    }

    /* Result Action Bar */
    .result-bottom-actions {
      display: flex;
      gap: 8px;
      margin-top: 14px;
    }

    .result-bottom-actions button {
      flex: 1;
      height: 46px;
      font-size: 14px;
    }

    /* Notes Card */
    .note-card {
      margin-top: 14px;
      display: flex;
      gap: 12px;
      padding: 14px 16px;
      border: 1px solid var(--card-border);
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-md);
      background: var(--card-bg);
      color: var(--ink-secondary);
    }

    .note-icon {
      width: 24px;
      height: 24px;
      flex: 0 0 24px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: grid;
      place-items: center;
      font-weight: 800;
      font-size: 13px;
    }

    .note-card strong {
      color: var(--ink);
      font-size: 14px;
      display: block;
      margin-bottom: 2px;
    }

    .note-card ul {
      margin: 4px 0 0;
      padding-left: 16px;
      font-size: 13px;
      line-height: 1.5;
    }

    /* Reference Tab Sub-Sections */
    .ref-subtabs {
      display: flex;
      gap: 6px;
      border-bottom: 1px solid var(--border);
      padding-bottom: 12px;
      margin-bottom: 18px;
    }

    .ref-subtab-btn {
      padding: 8px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--bg);
      color: var(--ink-secondary);
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .ref-subtab-btn.active {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .ref-card-inner {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 16px;
      margin-top: 14px;
    }

    .ref-output-badge {
      display: inline-block;
      padding: 6px 14px;
      border-radius: 8px;
      background: var(--primary-soft);
      color: var(--primary-text);
      font-size: 20px;
      font-weight: 800;
      margin: 10px 0;
    }

    .use-weight-btn {
      padding: 10px 18px;
      background: var(--primary);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-md);
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.15s ease;
    }

    .use-weight-btn:hover {
      background: var(--primary-hover);
    }

    .who-table-wrap {
      margin-top: 18px;
      overflow-x: auto;
    }

    .who-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 13px;
      text-align: left;
    }

    .who-table th, .who-table td {
      padding: 9px 12px;
      border-bottom: 1px solid var(--border);
    }

    .who-table th {
      background: var(--primary-soft);
      color: var(--primary-text);
      font-weight: 700;
    }

    /* Modal / Favourites Sheet */
    .favourites-card {
      margin-top: 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 18px;
      background: var(--card-bg);
      box-shadow: var(--shadow-md);
      margin-bottom: 18px;
    }

    .favourites-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .favourites-header h2 {
      margin: 0;
      font-size: 18px;
      font-weight: 700;
    }

    .favourites-header p {
      margin: 2px 0 0;
      color: var(--muted);
      font-size: 13px;
    }

    .favourites-header button {
      border: 0;
      background: transparent;
      color: var(--muted);
      font-size: 26px;
      cursor: pointer;
      line-height: 1;
    }

    .favourite-row {
      margin-top: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 10px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--bg);
    }

    .favourite-row strong {
      font-size: 14px;
    }

    .favourite-row button {
      border: 0;
      background: var(--primary-soft);
      color: var(--primary-text);
      border-radius: var(--radius-sm);
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
    }

    /* Toast Notification */
    .toast {
      position: fixed;
      bottom: 84px;
      left: 50%;
      transform: translateX(-50%) translateY(100px);
      background: #0f172a;
      color: #f8fafc;
      padding: 10px 20px;
      border-radius: 30px;
      font-size: 13.5px;
      font-weight: 600;
      box-shadow: 0 10px 25px rgba(0,0,0,0.25);
      opacity: 0;
      pointer-events: none;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      z-index: 999;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .toast.show {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }

    /* Clinical Governance & Disclaimer Card (Option 1) */
    .clinical-governance-card {
      margin-top: 24px;
      padding: 18px 20px;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      background: var(--card-bg);
      box-shadow: var(--shadow-sm);
    }

    .governance-header {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .governance-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      padding: 4px 9px;
      border-radius: var(--radius-sm);
      background: var(--primary-soft);
      color: var(--primary-text);
    }

    .governance-text {
      font-size: 12.5px;
      line-height: 1.6;
      color: var(--muted);
      margin: 0;
    }

    .governance-text strong {
      color: var(--ink-secondary);
      font-weight: 700;
    }

    .reference-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 12px;
      padding-top: 10px;
      border-top: 1px solid var(--border);
    }

    .ref-pill {
      font-size: 11px;
      font-weight: 600;
      padding: 4px 9px;
      border-radius: 20px;
      background: var(--bg);
      border: 1px solid var(--border);
      color: var(--ink-secondary);
    }

    .app-footer {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      padding: 20px 0 10px;
      color: var(--muted);
      font-size: 11.5px;
      text-align: center;
    }

    .app-footer strong {
      color: var(--ink-secondary);
      font-weight: 600;
    }

    .hidden { display: none !important; }

    @media (max-width: 600px) {
      .app { padding: 14px 12px 24px; }
      .brand h1 { font-size: 20px; }
      .brand-icon { width: 38px; height: 38px; font-size: 20px; }
      .weight-row { grid-template-columns: 1fr; }
      .steppers { width: 100%; justify-content: stretch; }
      .step-btn { flex: 1; height: 46px; }
      .result-main { grid-template-columns: 1fr; gap: 12px; }
      .result-divider { width: 100%; height: 1px; }
      .dose-block strong { font-size: 26px; }
      .dose-block .vol-tag { font-size: 17px; }
      .clinical-governance-card { padding: 14px 16px; margin-top: 18px; }
    }

    /* Desktop PC Viewport & Dual-Column Responsive Fit */
    @media (min-width: 860px) {
      .app {
        width: min(100% - 48px, 1060px);
        padding: 24px 32px 48px;
      }
      .calc-workspace-grid:has(.result-card:not(.hidden)) {
        display: grid;
        grid-template-columns: 1fr 1.05fr;
        gap: 20px;
        align-items: start;
      }
      .calc-workspace-grid:has(.result-card:not(.hidden)) .calc-col-output {
        position: sticky;
        top: 20px;
      }
      .calc-workspace-grid:has(.result-card:not(.hidden)) .result-card {
        margin-top: 0 !important;
      }
    }

    /* Pro Upgrade Button */
    .pro-btn {
      min-height: 40px;
      padding: 0 13px;
      border: 1.5px solid #f59e0b;
      border-radius: var(--radius-md);
      background: #fffbeb;
      color: #b45309;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 750;
      cursor: pointer;
      box-shadow: 0 1px 3px rgba(245, 158, 11, 0.2);
      transition: all 0.18s ease;
    }
    .pro-btn:hover {
      background: #fef3c7;
      transform: translateY(-1px);
    }
    [data-theme="dark"] .pro-btn {
      background: #2a1b05;
      color: #fde68a;
      border-color: #d97706;
    }
    .pro-btn.activated {
      background: var(--green-soft);
      color: var(--green-text);
      border-color: var(--green-border);
    }

    /* Asthma Clinical Suite Styles */
    .asthma-card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }
    .asthma-q-card {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 14px 16px;
      margin-bottom: 12px;
    }
    .asthma-q-title {
      font-size: 13.5px;
      font-weight: 750;
      color: var(--ink);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .asthma-options {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .asthma-chip {
      padding: 7px 14px;
      border: 1.5px solid var(--border);
      border-radius: 8px;
      background: var(--card-bg);
      color: var(--ink-secondary);
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.15s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .asthma-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .asthma-chip.active {
      background: var(--primary-soft);
      border-color: var(--primary);
      color: var(--primary-text);
      font-weight: 750;
    }
    .asthma-result-box {
      border-radius: var(--radius-md);
      padding: 18px;
      margin-top: 16px;
      border: 1.5px solid var(--border);
      transition: all 0.2s ease;
    }
    .asthma-result-box.well-controlled {
      background: var(--green-soft);
      border-color: var(--green-border);
      color: var(--green-text);
    }
    .asthma-result-box.partly-controlled {
      background: var(--amber-soft);
      border-color: var(--amber-border);
      color: var(--amber-text);
    }
    .asthma-result-box.uncontrolled {
      background: var(--red-soft);
      border-color: var(--red-border);
      color: var(--red-text);
    }
    .asthma-action-btn {
      margin-top: 12px;
      padding: 9px 16px;
      border-radius: 8px;
      border: none;
      background: var(--primary);
      color: #fff;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
      transition: background-color 0.15s ease;
    }
    .asthma-action-btn:hover {
      background: var(--primary-hover);
    }

    /* Pro Modal Backdrop and Card */
    .pro-modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(15, 23, 42, 0.65);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 9999;
      padding: 16px;
      transition: opacity 0.2s ease;
    }
    .pro-modal {
      background: var(--card-bg);
      border: 1.5px solid #f59e0b;
      border-radius: var(--radius-lg);
      max-width: 520px;
      width: 100%;
      padding: 24px;
      box-shadow: 0 10px 25px -5px rgba(0,0,0,0.3);
      position: relative;
      max-height: 90vh;
      overflow-y: auto;
    }
    .pro-modal-header {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 16px;
      border-bottom: 1px solid var(--border);
      padding-bottom: 14px;
    }
    .pro-badge-crown {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: linear-gradient(135deg, #f59e0b, #d97706);
      color: #fff;
      display: grid;
      place-items: center;
      font-size: 24px;
      box-shadow: 0 4px 10px rgba(245, 158, 11, 0.35);
    }
    .pro-features-list {
      list-style: none;
      padding: 0;
      margin: 14px 0;
    }
    .pro-features-list li {
      padding: 8px 0;
      font-size: 13.5px;
      color: var(--ink-secondary);
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }
    .pro-features-list li strong {
      color: var(--ink);
    }
    .pro-key-section {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 14px;
      margin-top: 16px;
    }

/* ==================================================
   PaedsCalc Pro • DuitNow & Touch 'n Go Upgrade Modal
   ================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 16px;
}

.modal-card {
  background: #ffffff;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  position: relative;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
  text-align: center;
  font-family: system-ui, -apple-system, sans-serif;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: transparent;
  border: none;
  font-size: 26px;
  color: #64748b;
  cursor: pointer;
  line-height: 1;
}

.badge-pro {
  background: #e0f2fe;
  color: #0369a1;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 999px;
}

.modal-header h2 {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  margin: 10px 0 6px 0;
}

.modal-header p {
  font-size: 13px;
  color: #475569;
  margin: 0;
  line-height: 1.4;
}

.price-container {
  margin: 12px 0;
}

.price-currency {
  font-size: 18px;
  font-weight: 600;
  color: #0f172a;
}

.price-amount {
  font-size: 32px;
  font-weight: 800;
  color: #0f172a;
}

.price-period {
  font-size: 13px;
  color: #64748b;
}

.qr-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 12px;
  margin: 12px 0;
}

.qr-image {
  width: 175px;
  height: auto;
  border-radius: 8px;
  margin: 0 auto;
  display: block;
}

.account-holder {
  font-size: 12px;
  font-weight: 700;
  color: #1e293b;
  margin: 8px 0 2px 0;
}

.bank-name {
  font-size: 11px;
  color: #64748b;
  margin: 0 0 6px 0;
}

.account-copy-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
  color: #334155;
}

.btn-copy {
  background: #e2e8f0;
  border: none;
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

.btn-copy:hover {
  background: #cbd5e1;
}

.steps-instruction {
  text-align: left;
  background: #f1f5f9;
  border-radius: 8px;
  padding: 10px 14px 10px 24px;
  font-size: 12px;
  color: #334155;
  margin-bottom: 14px;
}

.steps-instruction ol {
  margin: 0;
  padding: 0;
}

.steps-instruction li {
  margin-bottom: 4px;
}

.btn-whatsapp {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #25d366;
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  padding: 12px;
  border-radius: 8px;
  transition: opacity 0.2s;
}

.btn-whatsapp:hover {
  opacity: 0.9;
}

.license-entry {
  margin-top: 14px;
  border-top: 1px solid #f1f5f9;
  padding-top: 10px;
}

.license-entry p {
  font-size: 12px;
  color: #64748b;
  margin: 0 0 6px 0;
}

.license-input-group {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.license-input-group input {
  width: 150px;
  text-align: center;
  font-family: monospace;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  padding: 6px;
}

.license-input-group button {
  background: #0f172a;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.error-msg {
  color: #ef4444;
  font-size: 11px;
  margin-top: 6px;
}

/* Dark theme overrides for DuitNow modal */
[data-theme="dark"] .modal-card {
  background: #1e293b;
  color: #f8fafc;
}
[data-theme="dark"] .modal-header h2,
[data-theme="dark"] .price-currency,
[data-theme="dark"] .price-amount {
  color: #f8fafc;
}
[data-theme="dark"] .modal-header p,
[data-theme="dark"] .price-period {
  color: #94a3b8;
}
[data-theme="dark"] .qr-box {
  background: #0f172a;
  border-color: #334155;
}
[data-theme="dark"] .account-holder {
  color: #f1f5f9;
}
[data-theme="dark"] .bank-name {
  color: #94a3b8;
}
[data-theme="dark"] .account-copy-row {
  color: #cbd5e1;
}
[data-theme="dark"] .btn-copy {
  background: #334155;
  color: #f1f5f9;
}
[data-theme="dark"] .btn-copy:hover {
  background: #475569;
}
[data-theme="dark"] .steps-instruction {
  background: #0f172a;
  color: #cbd5e1;
}
[data-theme="dark"] .license-entry {
  border-top-color: #334155;
}
[data-theme="dark"] .license-entry p {
  color: #94a3b8;
}
[data-theme="dark"] .license-input-group input {
  background: #0f172a;
  color: #f8fafc;
  border-color: #475569;
}
[data-theme="dark"] .license-input-group button {
  background: #2563eb;
}