/* ====== Theme tokens ====== */
  :root {
    --bg: #f6f6f7;
    --surface: #ffffff;
    --surface-tint: #e2e8f0;
    --surface-2: rgba(0,0,0,0.025);
    --surface-hover: #f3f4f6;
    --surface-strong: #e5e7eb;
    --border: #e5e7eb;
    --border-strong: #d1d5db;
    --text: #111;
    --text-2: #6b7280;
    --text-3: #9ca3af;
    --accent: #1f2937;
    --accent-fg: #ffffff;
    --accent-hover: #111;
    --backdrop: rgba(0,0,0,0.4);
    --overlay: rgba(255,255,255,0.95);
    --success-bg: #ecfdf5;
    --success-fg: #065f46;
    --success-border: #a7f3d0;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.18);
    --shadow-lg: 0 20px 50px rgba(0,0,0,0.2);
  }
  body.dark {
    --bg: #0f1115;
    --surface: #1a1d23;
    --surface-tint: #262d36;
    --surface-2: rgba(255,255,255,0.04);
    --surface-hover: #2a2f37;
    --surface-strong: #3a414b;
    --border: #2d333b;
    --border-strong: #3a414b;
    --text: #e5e7eb;
    --text-2: #9ca3af;
    --text-3: #6b7280;
    --accent: #f3f4f6;
    --accent-fg: #0f1115;
    --accent-hover: #ffffff;
    --backdrop: rgba(0,0,0,0.7);
    --overlay: rgba(20,22,27,0.95);
    --success-bg: #052e22;
    --success-fg: #6ee7b7;
    --success-border: #064e3b;
    --danger: #fca5a5;
    --danger-bg: #2c1213;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 20px 50px rgba(0,0,0,0.6);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html, body { height: 100%; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.4;
    transition: background 0.2s, color 0.2s;
  }
  button { font-family: inherit; cursor: pointer; }
  input, select, textarea { font-family: inherit; font-size: 14px; }

  /* ====== Layout ====== */
  #app { min-height: 100vh; display: flex; flex-direction: column; }

  /* ====== Header ====== */
  .header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
  }
  .header h1 { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
  .header .range { color: var(--text-2); font-size: 13px; margin-left: 12px; }
  .header-right { display: flex; gap: 8px; align-items: center; }
  .tz-pill {
    font-size: 12px;
    color: var(--text-2);
    padding: 4px 10px;
    background: var(--surface-hover);
    border-radius: 999px;
    border: 1px solid var(--border);
    white-space: nowrap;
    margin-right: 4px;
  }
  .icon-btn {
    width: 34px; height: 34px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    display: inline-flex; align-items: center; justify-content: center;
    color: var(--text-2);
    transition: background 0.15s;
  }
  .icon-btn:hover { background: var(--surface-hover); border-color: var(--border); }
  .icon-btn svg { width: 18px; height: 18px; }
  .user-menu { position: relative; }
  .avatar-btn {
    width: 34px; height: 34px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    padding: 0;
    display: inline-flex; align-items: center; justify-content: center;
    overflow: hidden;
    color: var(--text);
    box-shadow: var(--shadow-sm);
  }
  .avatar-btn:hover { border-color: var(--border-strong); background: var(--surface-hover); }
  .avatar-img { width: 100%; height: 100%; object-fit: cover; display: block; }
  .avatar-fallback {
    width: 100%; height: 100%;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: #fff;
  }
  .user-dropdown {
    position: absolute;
    top: calc(100% + 8px); right: 0;
    width: 220px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 8px;
    display: none;
    z-index: 40;
  }
  .user-dropdown.open { display: block; }
  .user-meta { padding: 8px 10px 10px; border-bottom: 1px solid var(--border); margin-bottom: 6px; }
  .user-meta strong { display: block; font-size: 13px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .user-meta span { display: block; margin-top: 2px; font-size: 12px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .signout-btn {
    width: 100%;
    border: 0;
    background: transparent;
    color: var(--danger);
    text-align: left;
    border-radius: 8px;
    padding: 9px 10px;
    font-weight: 600;
  }
  .signout-btn:hover { background: var(--danger-bg); }

  /* ====== Calendar ====== */
  .calendar { padding: 16px 24px 80px; max-width: 1280px; margin: 0 auto; width: 100%; }
  .load-earlier {
    display: block;
    margin: 0 auto 12px;
    padding: 6px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-2);
    font-size: 12px;
  }
  .load-earlier:hover { background: var(--surface-hover); }
  .weekday-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 6px;
  }
  .weekday-header div {
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 6px 0;
  }
  .calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
  }
  .day-cell {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    min-height: 100px;
    display: flex; flex-direction: column;
    position: relative;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
  }
  .day-cell:hover { border-color: var(--border-strong); }
  .day-cell.past { opacity: 0.55; }
  .day-cell.past:hover { opacity: 0.8; }
  .day-cell.today {
    border-color: var(--accent);
    border-width: 2px;
    padding: 7px;
  }
  /* Alternating monthly tint */
  .day-cell.tint-a { background: var(--surface); }
  .day-cell.tint-b { background: var(--surface-tint); }
  /* Accent bar + label on the 1st of each month */
  .day-cell.month-start::before {
    content: '';
    position: absolute;
    left: 0; top: -1px; bottom: -1px;
    width: 3px;
    background: var(--accent);
    border-radius: 3px 0 0 3px;
    pointer-events: none;
  }
  .day-cell.today.month-start::before {
    top: -2px; bottom: -2px;
  }

  .day-num {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
    display: flex; align-items: center; gap: 4px;
  }
  .day-cell.today .day-num { color: var(--accent); }
  .day-num .month-label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 0.05em;
  }

  .content-list { display: flex; flex-direction: column; gap: 3px; flex: 1; }
  .content-card {
    border-left: 3px solid var(--cat-color, #3b82f6);
    background: var(--surface-2);
    padding: 3px 6px;
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.15s;
  }
  .content-card:hover { background: var(--surface-hover); }
  .content-card .time { font-size: 10px; color: var(--text-2); line-height: 1.2; }
  .content-card .title {
    font-size: 11px;
    color: var(--text);
    line-height: 1.25;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }

  /* ====== FAB ====== */
  .fab {
    position: fixed;
    bottom: 24px; right: 24px;
    width: 52px; height: 52px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--accent-fg);
    border: none;
    box-shadow: var(--shadow-md);
    display: flex; align-items: center; justify-content: center;
    transition: transform 0.15s, background 0.15s;
    z-index: 5;
  }
  .fab:hover { background: var(--accent-hover); transform: translateY(-2px); }
  .fab svg { width: 22px; height: 22px; }

  /* ====== Modal ====== */
  .modal-backdrop {
    position: fixed; inset: 0;
    background: var(--backdrop);
    display: none;
    align-items: center; justify-content: center;
    z-index: 100;
    padding: 20px;
  }
  .modal-backdrop.open { display: flex; }
  .modal {
    background: var(--surface);
    border-radius: 10px;
    padding: 24px;
    width: 100%;
    max-width: 460px;
    box-shadow: var(--shadow-lg);
    animation: pop 0.15s ease-out;
    color: var(--text);
  }
  @keyframes pop {
    from { opacity: 0; transform: scale(0.96); }
    to { opacity: 1; transform: scale(1); }
  }
  .modal-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 18px;
  }
  .modal-header h2 { font-size: 16px; font-weight: 600; }
  .modal-close {
    background: transparent; border: none;
    width: 28px; height: 28px;
    border-radius: 4px;
    color: var(--text-2);
  }
  .modal-close:hover { background: var(--surface-hover); color: var(--text); }

  .field { margin-bottom: 14px; }
  .field label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-2);
    margin-bottom: 5px;
  }
  .field input, .field select {
    width: 100%;
    padding: 9px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 5px;
    background: var(--surface);
    color: var(--text);
    transition: border-color 0.15s;
  }
  .field input:focus, .field select:focus {
    outline: none;
    border-color: var(--accent);
  }
  .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

  .category-select-wrap { position: relative; }
  .category-color-dot {
    position: absolute;
    left: 10px; top: 50%;
    transform: translateY(-50%);
    width: 10px; height: 10px;
    border-radius: 50%;
    pointer-events: none;
  }
  .category-select-wrap select { padding-left: 28px; }

  .modal-footer {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 22px;
  }
  .btn {
    padding: 8px 14px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text);
    border-radius: 5px;
    font-size: 13px;
    font-weight: 500;
  }
  .btn:hover { background: var(--surface-hover); }
  .btn-primary {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
  }
  .btn-primary:hover { background: var(--accent-hover); }
  .btn-danger {
    background: transparent;
    border: none;
    color: var(--danger);
    font-size: 13px;
    padding: 8px 0;
  }
  .btn-danger:hover { text-decoration: underline; }
  .btn-group { display: flex; gap: 8px; }

  /* ====== New category sub-modal ====== */
  .sub-modal-overlay {
    position: absolute; inset: 0;
    background: var(--overlay);
    display: none;
    align-items: center; justify-content: center;
    border-radius: 10px;
    padding: 24px;
  }
  .sub-modal-overlay.open { display: flex; }
  .sub-modal { width: 100%; }
  .color-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; }
  .color-swatch {
    aspect-ratio: 1;
    border-radius: 5px;
    cursor: pointer;
    border: 2px solid transparent;
  }
  .color-swatch.selected { border-color: var(--text); }

  /* ====== Settings ====== */
  .settings { padding: 24px; max-width: 700px; margin: 0 auto; width: 100%; }
  .settings h2 {
    font-size: 18px; font-weight: 600;
    margin-bottom: 16px;
  }
  .settings .section-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
  }
  .category-row {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
  }
  .category-row:last-child { border-bottom: none; }
  .category-row .swatch {
    width: 18px; height: 18px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid var(--border);
  }
  .category-row input[type="text"] {
    flex: 1;
    padding: 6px 8px;
    border: 1px solid transparent;
    border-radius: 4px;
    background: transparent;
    color: var(--text);
  }
  .category-row input[type="text"]:hover { border-color: var(--border); background: var(--surface-2); }
  .category-row input[type="text"]:focus {
    outline: none;
    border-color: var(--border-strong);
    background: var(--surface);
  }
  .category-row .count { font-size: 12px; color: var(--text-2); min-width: 60px; }
  .category-row .delete-btn {
    background: transparent;
    border: none;
    color: var(--danger);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
  }
  .category-row .delete-btn:hover { background: var(--danger-bg); }
  .category-row .delete-btn:disabled { color: var(--text-3); cursor: not-allowed; }

  .add-category-btn {
    margin-top: 12px;
    padding: 8px 12px;
    background: var(--surface-hover);
    border: 1px dashed var(--text-3);
    border-radius: 5px;
    color: var(--text-2);
    font-size: 13px;
  }
  .add-category-btn:hover { background: var(--surface-strong); }

  /* Toggle switch */
  .toggle-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 0;
  }
  .toggle-row .label-block { font-size: 13px; }
  .toggle-row .label-block .sub { font-size: 12px; color: var(--text-2); margin-top: 2px; }
  .switch {
    position: relative;
    width: 38px; height: 22px;
    background: var(--border-strong);
    border-radius: 11px;
    cursor: pointer;
    transition: background 0.15s;
    flex-shrink: 0;
  }
  .switch::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 18px; height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.15s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
  }
  .switch.on { background: var(--accent); }
  .switch.on::after { transform: translateX(16px); }

  .help-text {
    font-size: 12px;
    color: var(--text-2);
    margin-top: 4px;
    line-height: 1.45;
  }
  .test-result {
    margin-top: 8px;
    padding: 8px 10px;
    border-radius: 5px;
    font-size: 12px;
    display: none;
  }
  .test-result.success { display: block; background: var(--success-bg); color: var(--success-fg); border: 1px solid var(--success-border); }

  /* ====== Password gate ====== */
  .gate {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg);
  }
  .gate-card {
    background: var(--surface);
    padding: 32px;
    border-radius: 10px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 360px;
    text-align: center;
    box-shadow: var(--shadow-sm);
  }
  .gate-card h1 {
    font-size: 18px; font-weight: 600;
    margin-bottom: 6px;
  }
  .gate-card p {
    color: var(--text-2);
    font-size: 13px;
    margin-bottom: 20px;
  }
  .gate-card input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text);
    border-radius: 6px;
    margin-bottom: 12px;
  }
  .gate-card input:focus { outline: none; border-color: var(--accent); }
  .gate-card button {
    width: 100%;
    padding: 10px;
    background: var(--accent);
    color: var(--accent-fg);
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
  }
  .gate-card button:hover { background: var(--accent-hover); }
  .gate-card .hint { font-size: 11px; color: var(--text-3); margin-top: 12px; }

  .empty-day-hover {
    flex: 1;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-3);
    font-size: 18px;
    opacity: 0;
    transition: opacity 0.15s;
  }
  .day-cell:hover .empty-day-hover { opacity: 1; }
  .day-cell.past .empty-day-hover { display: none; }

  .more-link {
    font-size: 10px;
    color: var(--text-2);
    padding: 2px 6px;
    cursor: pointer;
  }
  .more-link:hover { color: var(--text); }

  /* ====== Toast ====== */
  .toast {
    position: fixed; top: 60px; right: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    box-shadow: var(--shadow-md);
    z-index: 200;
  }
  .toast.error { color: var(--danger); border-color: var(--danger); }