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

    #calsys-wrap {
      --calsys-accent:      #2563eb;
      --calsys-accent-dark: #1d4ed8;
      --calsys-bg:          #ffffff;
      --calsys-surface:     #f8fafc;
      --calsys-border:      #e2e8f0;
      --calsys-text:        #0f172a;
      --calsys-text-muted:  #475569;
      --calsys-today-bg:    #eff6ff;
      --calsys-radius:      8px;
      --calsys-shadow:      0 1px 3px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
      --calsys-shadow-lg:   0 10px 25px rgba(0,0,0,.12), 0 4px 10px rgba(0,0,0,.08);

      width: 100%;
      max-width: 900px;
      margin: 0 auto;
      color: var(--calsys-text);
      background: var(--calsys-bg);
    }

    /* ── Toolbar ── */
    .calsys-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 16px 0 20px;
      flex-wrap: wrap;
    }

    .calsys-toolbar-left {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .calsys-heading {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -.01em;
      margin: 0;
      min-width: 160px;
    }

    .calsys-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 7px 14px;
      border: 1.5px solid var(--calsys-border);
      border-radius: var(--calsys-radius);
      background: var(--calsys-bg);
      color: var(--calsys-text);
      font-size: .875rem;
      font-weight: 500;
      cursor: pointer;
      line-height: 1;
      transition: background .15s, border-color .15s, color .15s;
      text-decoration: none;
    }

    .calsys-btn:hover,
    .calsys-btn:focus-visible {
      background: var(--calsys-surface);
      border-color: #94a3b8;
      outline: none;
    }

    .calsys-btn:focus-visible {
      outline: 3px solid var(--calsys-accent);
      outline-offset: 2px;
    }

    .calsys-btn-icon { padding: 7px 10px; }

    .calsys-btn-primary {
      background: var(--calsys-accent);
      border-color: var(--calsys-accent);
      color: #fff;
    }

    .calsys-btn-primary:hover,
    .calsys-btn-primary:focus-visible {
      background: var(--calsys-accent-dark);
      border-color: var(--calsys-accent-dark);
      color: #fff;
    }

    .calsys-btn[aria-pressed="true"] {
      background: var(--calsys-accent);
      border-color: var(--calsys-accent);
      color: #fff;
    }

    .calsys-view-toggle {
      display: flex;
      border: 1.5px solid var(--calsys-border);
      border-radius: var(--calsys-radius);
      overflow: hidden;
    }

    .calsys-view-toggle .calsys-btn {
      border: none;
      border-radius: 0;
      border-right: 1.5px solid var(--calsys-border);
    }

    .calsys-view-toggle .calsys-btn:last-child { border-right: none; }

    /* ── Agenda ── */
    .calsys-agenda { display: flex; flex-direction: column; gap: 0; }

    .calsys-agenda-date-header {
      display: flex;
      align-items: baseline;
      gap: 8px;
      padding: 18px 0 8px;
      border-bottom: 2px solid var(--calsys-border);
      margin-bottom: 10px;
    }

    .calsys-agenda-date-header .calsys-day-num {
      font-size: 1.5rem;
      font-weight: 700;
      line-height: 1;
    }

    .calsys-agenda-date-header .calsys-day-label {
      font-size: 1rem;
      font-weight: 600;
      color: var(--calsys-text-muted);
      text-transform: uppercase;
      letter-spacing: .05em;
    }

    .calsys-agenda-date-header.calsys-today-header .calsys-day-num,
    .calsys-agenda-date-header.calsys-today-header .calsys-day-label {
      color: var(--calsys-accent);
    }

    .calsys-event-card {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 12px 14px;
      margin-bottom: 8px;
      border: 1.5px solid var(--calsys-border);
      border-left: 4px solid var(--calsys-accent);
      border-radius: var(--calsys-radius);
      background: var(--calsys-bg);
      cursor: pointer;
      transition: box-shadow .15s, border-color .15s, background .15s;
      text-align: left;
      width: 100%;
      box-shadow: var(--calsys-shadow);
    }

    .calsys-event-card:hover,
    .calsys-event-card:focus-visible {
      box-shadow: var(--calsys-shadow-lg);
      background: var(--calsys-surface);
      outline: none;
    }

    .calsys-event-card:focus-visible {
      outline: 3px solid var(--calsys-accent);
      outline-offset: 2px;
    }

    .calsys-event-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--calsys-accent);
      flex-shrink: 0;
      margin-top: 5px;
    }

    .calsys-event-body { flex: 1; min-width: 0; }

    .calsys-event-title {
      font-size: 1.125rem;
      font-weight: 600;
      margin: 0 0 2px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .calsys-event-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      font-size: 1rem;
      color: var(--calsys-text-muted);
      margin-top: 2px;
    }

    .calsys-event-meta span {
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .calsys-event-arrow {
      color: var(--calsys-text-muted);
      flex-shrink: 0;
      align-self: center;
    }

    .calsys-no-events {
      padding: 48px 0;
      text-align: center;
      color: var(--calsys-text-muted);
      font-size: 1rem;
    }

    /* ── Month ── */
    .calsys-month-grid-header {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      text-align: center;
      font-size: .875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: .06em;
      color: var(--calsys-text-muted);
      border-bottom: 2px solid var(--calsys-border);
      padding-bottom: 8px;
    }

    .calsys-month-grid {
      display: grid;
      grid-template-columns: repeat(7, minmax(0, 1fr));
      border-left: 1.5px solid var(--calsys-border);
      border-top: 1.5px solid var(--calsys-border);
    }

    .calsys-month-cell {
      border-right: 1.5px solid var(--calsys-border);
      border-bottom: 1.5px solid var(--calsys-border);
      min-height: 88px;
      padding: 6px;
      background: var(--calsys-bg);
      min-width: 0;
      overflow: hidden;
    }

    .calsys-month-cell.calsys-other-month { background: var(--calsys-surface); }
    .calsys-month-cell.calsys-today-cell  { background: var(--calsys-today-bg); }

    .calsys-month-day-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 4px;
      line-height: 1;
    }

    .calsys-today-cell .calsys-month-day-num {
      background: var(--calsys-accent);
      color: #fff;
    }

    .calsys-other-month .calsys-month-day-num { color: #94a3b8; }

    .calsys-month-event-pill {
      display: block;
      font-size: .8125rem;
      font-weight: 500;
      background: var(--calsys-accent);
      color: #fff;
      border-radius: 4px;
      padding: 2px 6px;
      margin-bottom: 2px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      cursor: pointer;
      border: none;
      width: 100%;
      text-align: left;
      transition: background .12s;
    }

    .calsys-month-event-pill:hover,
    .calsys-month-event-pill:focus-visible {
      background: var(--calsys-accent-dark);
      outline: none;
    }

    .calsys-month-event-pill:focus-visible {
      outline: 3px solid var(--calsys-accent);
      outline-offset: 2px;
    }

    .calsys-month-more {
      font-size: .8125rem;
      color: var(--calsys-text-muted);
      font-weight: 600;
      padding: 1px 4px;
    }

    /* ── Modal backdrop ── */
    .calsys-modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(15,23,42,.45);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 9999;
      padding: 16px;
      backdrop-filter: blur(2px);
      opacity: 0;
      transition: opacity .2s;
    }

    .calsys-modal-backdrop.calsys-open {
      display: flex;
      opacity: 1;
    }

    /* ── Modal ── */
    .calsys-modal {
      background: #ffffff;
      color: #0f172a;
      font-size: 1.25rem;
      line-height: 1.75;
      border-radius: 12px;
      box-shadow: 0 20px 60px rgba(0,0,0,.35), 0 4px 16px rgba(0,0,0,.2);
      border: 1.5px solid #e2e8f0;
      width: 92%;
      max-width: 820px;
      max-height: 90vh;
      overflow-y: auto;
      transform: translateY(12px) scale(.98);
      transition: transform .2s;
      outline: none;
    }

    .calsys-modal-backdrop.calsys-open .calsys-modal {
      transform: translateY(0) scale(1);
    }

    .calsys-modal-header {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 16px;
      padding: 28px 28px 0;
    }

    .calsys-modal-title {
      font-size: 1.75rem;
      font-weight: 700;
      margin: 0;
      line-height: 1.3;
      color: #0f172a;
    }

    .calsys-modal-close {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border: 1.5px solid #e2e8f0;
      border-radius: 6px;
      background: transparent;
      cursor: pointer;
      flex-shrink: 0;
      color: #475569;
      font-size: 1.25rem;
      transition: background .12s, color .12s;
    }

    .calsys-modal-close:hover,
    .calsys-modal-close:focus-visible {
      background: #f8fafc;
      color: #0f172a;
      outline: none;
    }

    .calsys-modal-close:focus-visible {
      outline: 3px solid #2563eb;
      outline-offset: 2px;
    }

    .calsys-modal-body {
      padding: 20px 28px 32px;
    }

    .calsys-modal-content-box {
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 8px;
      padding: 20px;
    }

    .calsys-modal-meta {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 20px;
      padding-bottom: 20px;
      border-bottom: 1.5px solid #e2e8f0;
    }

    .calsys-modal-meta-row {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 1.25rem;
      line-height: 1.75;
      color: #475569;
    }

    .calsys-modal-meta-row svg {
      flex-shrink: 0;
      margin-top: 4px;
      width: 18px;
      height: 18px;
    }

    .calsys-modal-meta-row strong {
      font-size: 1.25rem;
      font-weight: 600;
      color: #0f172a;
    }

    .calsys-modal-details {
      font-size: 1.25rem;
      line-height: 1.75;
      color: #0f172a;
    }

    /* ── Loading / Error ── */
    .calsys-state-msg {
      padding: 48px 0;
      text-align: center;
      color: var(--calsys-text-muted);
      font-size: 1rem;
    }

    /* ── Dark mode ── */
    @media (prefers-color-scheme: dark) {
      #calsys-wrap {
        --calsys-bg:          #0f172a;
        --calsys-surface:     #1e293b;
        --calsys-border:      #334155;
        --calsys-text:        #f1f5f9;
        --calsys-text-muted:  #94a3b8;
        --calsys-today-bg:    #1e3a5f;
        --calsys-shadow:      0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
        --calsys-shadow-lg:   0 10px 25px rgba(0,0,0,.5), 0 4px 10px rgba(0,0,0,.4);
      }
      .calsys-modal                  { background: #1e293b; color: #f1f5f9; border-color: #334155; }
      .calsys-modal-title            { color: #f1f5f9; }
      .calsys-modal-meta-row         { color: #94a3b8; }
      .calsys-modal-meta-row strong  { color: #f1f5f9; }
      .calsys-modal-details          { color: #f1f5f9; }
      .calsys-modal-content-box      { background: #0f172a; border-color: #334155; }
      .calsys-modal-meta             { border-color: #334155; }
      .calsys-modal-close            { border-color: #334155; color: #94a3b8; }
      .calsys-modal-close:hover      { background: #334155; color: #f1f5f9; }
    }

    /* ── Responsive ── */
    @media (max-width: 560px) {
      .calsys-month-cell      { min-height: 60px; padding: 4px 3px; }
      .calsys-month-day-num   { width: 24px; height: 24px; font-size: .8125rem; }
      .calsys-month-event-pill { font-size: .6875rem; padding: 2px 4px; }
      .calsys-heading         { font-size: 1rem; }
      .calsys-modal           { width: 98%; }
      .calsys-modal-header    { padding: 20px 16px 0; }
      .calsys-modal-body      { padding: 16px 16px 24px; }
    }