:root {
    color-scheme: light;
    --paper: #f6f5f4;
    --surface: #ffffff;
    --surface-subtle: #fafaf9;
    --ink: #111111;
    --ink-soft: #615d59;
    --muted: #757575;
    --border: #dfe1e7;
    --border-strong: #c9ccd5;
    --blue: #0075de;
    --blue-hover: #0068c7;
    --blue-soft: #e6f3fe;
    --sky: #ddf6ff;
    --coral: #ffe2e0;
    --coral-strong: #ff6467;
    --marigold: #fff0c7;
    --marigold-strong: #ffb110;
    --mint: #ddf6e8;
    --success: #22863a;
    --danger: #a12b31;
    --midnight: #040f32;
  }

  * { box-sizing: border-box; }
  html { min-height: 100%; background: var(--paper); }

  body {
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    background: var(--paper);
    color: var(--ink);
    font-family: 'Noto Sans Thai', system-ui, sans-serif;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  button, input, select, textarea { font: inherit; }
  button { color: inherit; }
  button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
    outline: 3px solid rgba(0, 117, 222, 0.2);
    outline-offset: 2px;
  }
  [hidden] { display: none !important; }
  .ambient { display: none; }

  .eyebrow {
    margin: 0 0 0.45rem;
    color: var(--blue);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.14em;
  }

  .brand-mark {
    display: grid;
    width: 4.5rem;
    height: 4.5rem;
    margin-bottom: 2rem;
    place-items: center;
    border: 1px solid var(--ink);
    border-radius: 0.5rem;
    background: var(--ink);
    color: #fff;
  }
  .brand-mark span {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.06em;
  }
  .brand-mark-small {
    width: 2.5rem;
    height: 2.5rem;
    margin: 0;
    border-radius: 0.25rem;
  }
  .brand-mark-small span { font-size: 0.85rem; }

  /* Authentication */
  .auth-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(22rem, 0.72fr);
    width: min(72rem, calc(100% - 2rem));
    min-height: 100vh;
    margin: 0 auto;
    align-items: center;
    gap: clamp(3rem, 8vw, 8rem);
    padding: 3.5rem 0;
  }
  .auth-story { max-width: 38rem; }
  .auth-story h1 {
    margin: 0;
    color: var(--ink);
    font-family: 'Noto Serif Thai', serif;
    font-size: clamp(3.3rem, 7.6vw, 6rem);
    font-weight: 600;
    line-height: 1.04;
    letter-spacing: -0.055em;
  }
  .auth-story h1 span { color: var(--blue); }
  .story-copy {
    max-width: 32rem;
    margin: 2rem 0 1.6rem;
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.75;
  }
  .feature-pills { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.6rem; }
  .feature-pills span {
    min-height: 4.5rem;
    padding: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: var(--surface);
    color: var(--ink-soft);
    font-size: 0.76rem;
    line-height: 1.4;
  }
  .feature-pills span:nth-child(1) { background: var(--sky); }
  .feature-pills span:nth-child(2) { background: var(--marigold); }
  .feature-pills span:nth-child(3) { background: var(--coral); }

  .auth-card, .dialog-card {
    border: 1px solid var(--border);
    background: var(--surface);
  }
  .auth-card {
    width: 100%;
    max-width: 27rem;
    justify-self: end;
    padding: clamp(1.7rem, 4vw, 2.5rem);
    border-radius: 1rem;
  }
  .auth-card-head { margin-bottom: 1.8rem; }
  .auth-card-head h2, .dialog-card h2 {
    margin: 0;
    color: var(--ink);
    font-family: 'Noto Serif Thai', serif;
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.025em;
  }
  .auth-card-head > p:last-child, .dialog-intro, .section-heading > div > p:last-child {
    margin: 0.45rem 0 0;
    color: var(--muted);
    font-size: 0.88rem;
  }
  .stack-form, .dialog-card { display: grid; gap: 1rem; }

  /* Form controls */
  .field {
    display: grid;
    gap: 0.42rem;
    color: var(--ink);
    font-size: 0.8rem;
    font-weight: 600;
  }
  .field input, .field select, .field textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 0.38rem;
    outline: none;
    background-color: var(--surface);
    color: var(--ink);
    transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
  }
  .field input, .field select { height: 3rem; padding: 0 0.85rem; }
  .field textarea { min-height: 7.5rem; padding: 0.75rem 0.85rem; resize: vertical; line-height: 1.6; }
  .field input::placeholder, .field textarea::placeholder { color: #9a9a9a; }
  .field input:focus, .field select:focus, .field textarea:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(0, 117, 222, 0.12);
  }
  .field select {
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
    background-position: calc(100% - 17px) 20px, calc(100% - 12px) 20px;
    background-size: 5px 5px;
    background-repeat: no-repeat;
  }
  #registerOtp, #resetOtp {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    letter-spacing: 0.22em;
  }
  .password-wrap, .input-action-wrap { display: flex; position: relative; }
  .password-wrap input { padding-right: 4.3rem; }
  .show-password {
    position: absolute;
    top: 0;
    right: 0;
    height: 100%;
    padding: 0 0.8rem;
    border: 0;
    background: transparent;
    color: var(--blue);
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 600;
  }
  .input-action-wrap { gap: 0.5rem; }
  .input-action-wrap button {
    flex: 0 0 auto;
    padding: 0 0.9rem;
    border: 1px solid var(--blue);
    border-radius: 0.38rem;
    background: var(--blue-soft);
    color: var(--blue);
    cursor: pointer;
    font-size: 0.76rem;
    font-weight: 600;
  }

  /* Buttons */
  .primary-button, .secondary-button, .quick-book {
    min-height: 2.75rem;
    border-radius: 0.38rem;
    cursor: pointer;
    font-weight: 600;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease, opacity 160ms ease;
  }
  .primary-button {
    display: flex;
    width: 100%;
    padding: 0.65rem 1rem;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    border: 1px solid var(--blue);
    background: var(--blue);
    color: #fff;
  }
  .primary-button:hover, .quick-book:hover { border-color: var(--blue-hover); background: var(--blue-hover); }
  .compact-button { width: auto; flex: 0 0 auto; }
  button:disabled { cursor: wait; opacity: 0.55; }
  .cyan-button { border-color: var(--blue); background: var(--blue); }
  .secondary-button { padding: 0.5rem 0.95rem; border: 1px solid var(--border); background: var(--surface); color: var(--ink); }
  .secondary-button:hover { border-color: var(--border-strong); background: var(--surface-subtle); }
  .auth-actions { display: flex; justify-content: center; gap: 0.75rem; margin-top: 1.25rem; color: var(--border-strong); font-size: 0.8rem; }
  .text-button { padding: 0; border: 0; background: transparent; color: var(--blue); cursor: pointer; font-weight: 600; }

  /* App shell */
  .app-shell { min-height: 100vh; background: var(--paper); }
  .app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    min-height: 4.5rem;
    padding: 0.75rem clamp(1rem, 3vw, 2rem);
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(20px);
  }
  .app-brand { display: flex; align-items: center; gap: 0.75rem; color: var(--ink); text-decoration: none; }
  .app-brand > span:last-child { display: grid; }
  .app-brand strong { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; }
  .app-brand small { color: var(--muted); font-size: 0.64rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
  .header-actions { display: flex; align-items: center; gap: 0.6rem; }
  .quick-book {
    display: inline-flex;
    padding: 0.5rem 1rem;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--blue);
    background: var(--blue);
    color: #fff;
    font-size: 0.8rem;
    white-space: nowrap;
  }
  .action-label-compact { display: none; }
  .header-action-button {
    display: inline-flex;
    min-height: 2.5rem;
    padding: 0.5rem 0.8rem;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    border: 1px solid var(--border);
    border-radius: 0.38rem;
    background: var(--surface);
    color: var(--ink-soft);
    cursor: pointer;
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    transition: color 160ms ease, background 160ms ease, border-color 160ms ease, opacity 160ms ease;
  }
  .header-action-button svg { flex: 0 0 auto; width: 1rem; height: 1rem; }
  .refresh-action { border-color: #9ecdf0; background: var(--blue-soft); color: var(--blue); }
  .refresh-action:hover { border-color: var(--blue); background: var(--surface); }
  .logout-action:hover { border-color: var(--border-strong); background: var(--surface-subtle); color: var(--ink); }
  .quick-book:focus-visible, .header-action-button:focus-visible {
    outline: 3px solid rgba(0, 117, 222, 0.2);
    outline-offset: 2px;
  }
  .user-chip { display: flex; align-items: center; gap: 0.6rem; padding-left: 0.8rem; border-left: 1px solid var(--border); }
  .user-avatar {
    display: grid;
    flex: 0 0 auto;
    width: 2.25rem;
    height: 2.25rem;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface-subtle);
    color: var(--ink);
    font-weight: 700;
  }
  .user-copy { display: grid; min-width: 7rem; }
  .user-copy strong { max-width: 12rem; overflow: hidden; color: var(--ink); font-size: 0.8rem; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
  .user-copy small { color: var(--muted); font-size: 0.68rem; }
  .studio-notice { border-bottom: 1px solid var(--border); background: var(--surface); }
  .studio-notice-inner {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: min(100%, 90rem);
    margin: 0 auto;
    gap: 1px;
    background: var(--border);
  }
  .studio-notice-panel {
    display: grid;
    grid-template-columns: 2rem minmax(0, 1fr);
    padding: 0.9rem clamp(1rem, 3vw, 2rem);
    align-items: start;
    gap: 0.8rem;
    background: var(--surface);
  }
  .studio-notice-icon {
    display: grid;
    width: 2rem;
    height: 2rem;
    place-items: center;
    border-radius: 0.38rem;
    color: var(--ink-soft);
    font-size: 0.85rem;
    font-weight: 700;
  }
  .booking-rules-notice .studio-notice-icon { background: var(--marigold); }
  .cleanliness-notice .studio-notice-icon { background: var(--mint); }
  .studio-notice-panel h2 { margin: 0 0 0.32rem; color: var(--ink); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.02em; }
  .studio-notice-panel p { margin: 0; color: var(--ink-soft); font-size: 0.72rem; line-height: 1.6; }
  .booking-rule-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 0;
    padding: 0;
    gap: 0.18rem 1rem;
    list-style: none;
    color: var(--ink-soft);
    font-size: 0.7rem;
    line-height: 1.55;
  }
  .booking-rule-list li { position: relative; padding-left: 0.7rem; }
  .booking-rule-list li::before { position: absolute; top: 0.58em; left: 0; width: 0.22rem; height: 0.22rem; border-radius: 50%; background: var(--border-strong); content: ''; }

  .app-content {
    display: grid;
    grid-template-columns: 15rem minmax(0, 1fr);
    width: min(100%, 90rem);
    min-height: calc(100vh - 4.5rem);
    margin: 0 auto;
  }
  .sidebar {
    display: flex;
    position: sticky;
    top: 4.5rem;
    height: calc(100vh - 4.5rem);
    padding: 1.5rem 1rem;
    flex-direction: column;
    border-right: 1px solid var(--border);
    background: var(--surface);
  }
  .tab-list { display: grid; gap: 0.28rem; }
  .tab-button {
    display: flex;
    min-height: 2.75rem;
    padding: 0.62rem 0.72rem;
    align-items: center;
    gap: 0.68rem;
    border: 1px solid transparent;
    border-radius: 0.38rem;
    background: transparent;
    color: var(--ink-soft);
    text-align: left;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
  }
  .tab-button > span { width: 1rem; color: var(--muted); text-align: center; font-size: 1rem; }
  .tab-button:hover { background: var(--surface-subtle); color: var(--ink); }
  .tab-button.active { border-color: #badcf7; background: var(--blue-soft); color: var(--blue); font-weight: 600; }
  .tab-button.active > span { color: var(--blue); }
  .count-badge {
    min-width: 1.35rem;
    margin-left: auto;
    padding: 0.08rem 0.38rem;
    border: 1px solid #efd27a;
    border-radius: 999px;
    background: var(--marigold);
    color: #6f4700;
    text-align: center;
    font-size: 0.64rem;
  }
  .sidebar-note { margin-top: auto; padding: 1rem; border: 1px solid var(--border); border-radius: 0.75rem; background: var(--surface-subtle); }
  .sidebar-note strong { color: var(--ink); font-size: 0.73rem; font-weight: 700; }
  .sidebar-note p { margin: 0.42rem 0 0; color: var(--ink-soft); font-size: 0.69rem; line-height: 1.7; }

  /* Workspace */
  .workspace { min-width: 0; padding: clamp(1.5rem, 3vw, 2.6rem); }
  .tab-panel { width: min(100%, 66rem); margin: 0 auto; }
  .section-heading { display: flex; margin-bottom: 1.8rem; align-items: flex-end; justify-content: space-between; gap: 1rem; }
  .section-heading h2 {
    margin: 0;
    color: var(--ink);
    font-family: 'Noto Serif Thai', serif;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.15;
  }
  .legend { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.9rem; color: var(--ink-soft); font-size: 0.72rem; font-weight: 500; }
  .legend span { display: flex; align-items: center; gap: 0.4rem; }
  .dot { width: 0.65rem; height: 0.65rem; border: 1px solid var(--border-strong); border-radius: 0.16rem; }
  .dot.room-a { border-color: #8bc7ee; background: var(--sky); }
  .dot.room-b { border-color: #f1aaa7; background: var(--coral); }
  .dot.pending { border-color: #e9ca66; background: var(--marigold); }

  /* FullCalendar */
  .calendar-card { overflow: hidden; padding: clamp(0.8rem, 1.8vw, 1.5rem); border: 1px solid var(--border); border-radius: 1rem; background: var(--surface); }
  .fc {
    --fc-border-color: var(--border);
    --fc-page-bg-color: transparent;
    --fc-neutral-bg-color: var(--surface-subtle);
    --fc-list-event-hover-bg-color: var(--blue-soft);
    --fc-today-bg-color: rgba(0, 117, 222, 0.045);
    --fc-now-indicator-color: var(--blue);
    color: var(--ink);
    font-family: 'Noto Sans Thai', system-ui, sans-serif;
    font-size: 0.8rem;
  }
  .fc .fc-toolbar { gap: 0.75rem; }
  .fc .fc-toolbar-title { color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 1.15rem; font-weight: 600; letter-spacing: -0.02em; }
  .fc .fc-button {
    padding: 0.42rem 0.68rem !important;
    border: 1px solid var(--border) !important;
    border-radius: 0.38rem !important;
    background: var(--surface) !important;
    box-shadow: none !important;
    color: var(--ink) !important;
    font-size: 0.72rem !important;
    font-weight: 600 !important;
    text-transform: none !important;
  }
  .fc .fc-button:hover { border-color: var(--border-strong) !important; background: var(--surface-subtle) !important; }
  .fc .fc-button-primary:not(:disabled).fc-button-active { border-color: var(--blue) !important; background: var(--blue-soft) !important; color: var(--blue) !important; }
  .fc .fc-col-header-cell-cushion, .fc .fc-timegrid-axis-cushion, .fc .fc-timegrid-slot-label-cushion { color: var(--muted); text-decoration: none; }
  .fc .fc-col-header-cell-cushion { padding: 0.7rem 0.2rem; color: var(--ink-soft); font-weight: 600; }
  .fc .fc-timegrid-slot { height: 2.5em; }
  .fc .fc-event { padding: 0.18rem 0.3rem; border-width: 0 0 0 2px !important; border-radius: 0.25rem; cursor: pointer; box-shadow: none !important; }
  .fc .fc-event-title { font-weight: 600; }
  .calendar-event-content { display: grid; min-width: 0; gap: 0.12rem; line-height: 1.25; }
  .calendar-event-title { overflow: hidden; font-size: 0.72rem; font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
  .calendar-event-status { display: flex; align-items: center; gap: 0.28rem; overflow: hidden; font-size: 0.62rem; font-weight: 600; opacity: 0.92; text-overflow: ellipsis; white-space: nowrap; }
  .calendar-event-status::before { width: 0.38rem; height: 0.38rem; flex: 0 0 auto; border-radius: 50%; background: currentColor; content: ''; }
  .fc .booking-event-checked-in { border-left-color: var(--success) !important; }
  .fc .booking-event-not-checked-in { border-left-color: var(--blue) !important; }
  .fc .booking-event-pending-approval { border-left-color: var(--marigold-strong) !important; }

  /* Teacher / Super Admin dashboard */
  .dashboard-heading { align-items: center; }
  .dashboard-live-status { display: inline-flex; padding: 0.48rem 0.7rem; align-items: center; gap: 0.42rem; border: 1px solid #9bcfaf; border-radius: 999px; background: var(--mint); color: #1e6b36; font-size: 0.68rem; font-weight: 700; white-space: nowrap; }
  .dashboard-live-status i { width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--success); }
  .dashboard-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.75rem; }
  .dashboard-stat { display: grid; min-height: 8.6rem; padding: 1rem; align-content: space-between; border: 1px solid var(--border); border-radius: 0.8rem; background: var(--surface); }
  .dashboard-stat.attention { border-color: #efd27a; background: var(--marigold); }
  .dashboard-stat.success { border-color: #9bcfaf; background: var(--mint); }
  .dashboard-stat.active { border-color: #9ecdf0; background: var(--sky); }
  .dashboard-stat > span { color: var(--ink-soft); font-size: 0.7rem; font-weight: 700; }
  .dashboard-stat > strong { margin: 0.45rem 0 0.28rem; color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 2rem; font-weight: 600; line-height: 1; }
  .dashboard-stat > small { overflow: hidden; color: var(--muted); font-size: 0.64rem; line-height: 1.45; text-overflow: ellipsis; }
  .dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(18rem, 0.92fr); margin-top: 1rem; gap: 1rem; }
  .dashboard-card { overflow: hidden; border: 1px solid var(--border); border-radius: 0.9rem; background: var(--surface); }
  .dashboard-card-heading { display: flex; min-height: 4.6rem; padding: 1rem 1.1rem; align-items: center; justify-content: space-between; gap: 0.8rem; border-bottom: 1px solid var(--border); }
  .dashboard-card-heading .eyebrow { margin-bottom: 0.22rem; font-size: 0.6rem; }
  .dashboard-card-heading h3 { margin: 0; color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 1.05rem; font-weight: 600; }
  .dashboard-action-list, .dashboard-room-list { display: grid; padding: 0 1.1rem; }
  .dashboard-action-item { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; padding: 0.9rem 0; align-items: center; gap: 0.75rem; border-bottom: 1px solid var(--border); }
  .dashboard-action-item:last-child { border-bottom: 0; }
  .dashboard-queue-badge { padding: 0.18rem 0.45rem; border: 1px solid #9ecdf0; border-radius: 999px; background: var(--blue-soft); color: var(--blue); font-size: 0.6rem; font-weight: 700; white-space: nowrap; }
  .dashboard-action-copy { min-width: 0; }
  .dashboard-action-copy strong { display: block; overflow: hidden; color: var(--ink); font-size: 0.78rem; text-overflow: ellipsis; white-space: nowrap; }
  .dashboard-action-copy small { display: block; margin-top: 0.2rem; color: var(--muted); font-size: 0.64rem; line-height: 1.45; }
  .dashboard-action-copy .dashboard-conflict-text { color: #8a5700; font-weight: 700; }
  .dashboard-wait-time { color: #6f4700; font-size: 0.62rem; font-weight: 700; white-space: nowrap; }
  .dashboard-room-item { display: grid; margin: 0.7rem 0 0; padding: 0.85rem; gap: 0.3rem; border: 1px solid var(--border); border-radius: 0.65rem; background: var(--surface-subtle); }
  .dashboard-room-item:last-child { margin-bottom: 0.7rem; }
  .dashboard-room-top { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
  .dashboard-room-top strong { font-size: 0.78rem; }
  .dashboard-room-item p { margin: 0; color: var(--ink-soft); font-size: 0.68rem; line-height: 1.5; }
  .dashboard-room-item.checked-in { border-color: #9bcfaf; background: var(--mint); }
  .dashboard-room-item.not-checked-in { border-color: #efd27a; background: var(--marigold); }
  .dashboard-room-item.upcoming { border-color: #9ecdf0; background: var(--sky); }
  .dashboard-status-badge { padding: 0.2rem 0.5rem; border: 1px solid var(--border); border-radius: 999px; background: rgba(255, 255, 255, 0.62); color: var(--ink-soft); font-size: 0.58rem; font-weight: 700; white-space: nowrap; }
  .dashboard-schedule-card { margin-top: 1rem; }
  .dashboard-legend { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.7rem; color: var(--ink-soft); font-size: 0.62rem; font-weight: 600; }
  .dashboard-legend span::before { margin-right: 0.3rem; content: '●'; }
  .dashboard-legend .pending::before { color: var(--marigold-strong); }
  .dashboard-legend .checked::before { color: var(--success); }
  .dashboard-legend .not-checked::before { color: var(--blue); }
  .dashboard-schedule-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 1rem; gap: 0.7rem; }
  .dashboard-schedule-item { display: grid; min-width: 0; padding: 0.85rem; gap: 0.35rem; border: 1px solid var(--border); border-left-width: 3px; border-radius: 0.65rem; background: var(--surface-subtle); }
  .dashboard-schedule-item.pending { border-left-color: var(--marigold-strong); background: var(--marigold); }
  .dashboard-schedule-item.checked-in { border-left-color: var(--success); background: var(--mint); }
  .dashboard-schedule-item.not-checked-in { border-left-color: var(--blue); background: var(--sky); }
  .dashboard-schedule-item time { color: var(--ink); font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 0.66rem; font-weight: 600; }
  .dashboard-schedule-item strong { overflow: hidden; color: var(--ink); font-size: 0.75rem; text-overflow: ellipsis; white-space: nowrap; }
  .dashboard-schedule-item small { color: var(--ink-soft); font-size: 0.62rem; line-height: 1.45; }
  .dashboard-empty { padding: 1.3rem 0.4rem; color: var(--muted); font-size: 0.7rem; line-height: 1.55; text-align: center; }

  /* Booking, approval and room lists */
  .booking-list, .approval-list, .room-management-list { display: grid; gap: 0.7rem; }
  .booking-item, .approval-item, .room-management-item, .empty-state { border: 1px solid var(--border); border-radius: 0.8rem; background: var(--surface); }
  .booking-item { display: grid; grid-template-columns: 4rem minmax(0, 1fr) auto; padding: 1rem; align-items: center; gap: 1rem; }
  .date-block { display: grid; min-height: 3.5rem; place-content: center; border: 1px solid #badcf7; border-radius: 0.5rem; background: var(--blue-soft); text-align: center; }
  .date-block strong { color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 1.15rem; line-height: 1; }
  .date-block small { margin-top: 0.22rem; color: var(--blue); font-size: 0.62rem; font-weight: 700; text-transform: uppercase; }
  .booking-info h3, .approval-copy h3 { margin: 0; color: var(--ink); font-size: 0.92rem; font-weight: 600; }
  .booking-info p, .approval-copy p { margin: 0.22rem 0 0; color: var(--muted); font-size: 0.74rem; }
  .booking-info .booking-decision-note { margin-top: 0.5rem; padding: 0.42rem 0.55rem; border-left: 3px solid var(--coral-strong); background: var(--coral); color: #8d2026; font-size: 0.68rem; line-height: 1.5; }
  .status-chip { padding: 0.32rem 0.58rem; border: 1px solid transparent; border-radius: 999px; font-size: 0.66rem; font-weight: 700; white-space: nowrap; }
  .status-Pending { border-color: #efd27a; background: var(--marigold); color: #6f4700; }
  .status-Approved { border-color: #9bcfaf; background: var(--mint); color: #1e6b36; }
  .status-Rejected { border-color: #f1aaa7; background: var(--coral); color: var(--danger); }
  .empty-state { display: grid; min-height: 14rem; padding: 2rem; place-content: center; color: var(--muted); text-align: center; }
  .empty-state strong { margin-bottom: 0.35rem; color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 1.1rem; font-weight: 600; }
  .approval-item { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; padding: 1rem 1.1rem; align-items: center; gap: 1rem; }
  .approval-item.has-conflict { border-color: #e5c761; box-shadow: inset 4px 0 0 var(--marigold-strong); }
  .approval-sequence { display: grid; justify-items: center; gap: 0.38rem; }
  .approval-queue-badge { padding: 0.18rem 0.48rem; border: 1px solid #9ecdf0; border-radius: 999px; background: var(--blue-soft); color: var(--blue); font-size: 0.64rem; font-weight: 700; white-space: nowrap; }
  .approval-room { display: grid; width: 3rem; height: 3rem; place-items: center; border: 1px solid #8bc7ee; border-radius: 0.5rem; background: var(--sky); color: #004f96; font-family: 'Noto Serif Thai', serif; font-size: 1.2rem; font-weight: 700; }
  .approval-copy .approval-request-time { margin-top: 0.45rem; color: var(--ink-soft); font-size: 0.7rem; line-height: 1.5; }
  .approval-request-time strong { color: var(--blue); font-weight: 700; }
  .approval-conflict-note, .approval-clear-note { display: grid; margin-top: 0.55rem; padding: 0.55rem 0.65rem; gap: 0.12rem; border-radius: 0.45rem; font-size: 0.67rem; line-height: 1.45; }
  .approval-conflict-note { border: 1px solid #e5c761; background: var(--marigold); color: #593b00; }
  .approval-conflict-note strong { font-size: 0.7rem; }
  .approval-conflict-note span { color: #6f4700; }
  .approval-clear-note { border: 1px solid #b9dec6; background: var(--mint); color: #1e6b36; }
  .approval-actions { display: flex; gap: 0.5rem; }
  .approve-button, .reject-button { min-height: 2.35rem; padding: 0.38rem 0.8rem; border-radius: 0.38rem; cursor: pointer; font-size: 0.74rem; font-weight: 700; }
  .approve-button { border: 1px solid var(--success); background: var(--success); color: #fff; }
  .reject-button { border: 1px solid #e8a2a0; background: var(--coral); color: var(--danger); }

  /* Room management */
  .room-admin-note { margin: -0.7rem 0 1rem; padding: 0.75rem 0.9rem; border: 1px solid #badcf7; border-radius: 0.5rem; background: var(--blue-soft); color: #004f96; font-size: 0.72rem; line-height: 1.5; }
  .room-management-item { display: grid; grid-template-columns: 3.4rem minmax(0, 1fr) auto; padding: 1rem 1.1rem; align-items: center; gap: 1rem; border-color: var(--room-border); }
  .room-admin-number { display: grid; width: 3.4rem; height: 3.4rem; place-items: center; border: 1px solid var(--room-border); border-radius: 0.5rem; background: var(--room-soft); color: var(--room-accent); font-family: 'Noto Serif Thai', serif; font-size: 1.1rem; font-weight: 700; }
  .room-admin-copy { min-width: 0; }
  .room-admin-copy h3 { margin: 0; color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 1.05rem; font-weight: 600; }
  .room-admin-copy p { margin: 0.25rem 0; color: var(--ink-soft); font-size: 0.76rem; line-height: 1.5; }
  .room-admin-copy .room-admin-hours { color: var(--blue); font-weight: 700; }
  .room-admin-copy small { color: var(--muted); font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 0.62rem; }
  .room-edit-button { min-width: 5rem; }

  /* Check-in */
  .checkin-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
  .checkin-card { position: relative; display: grid; min-height: 20rem; padding: 1.5rem; overflow: hidden; align-content: space-between; border: 1px solid var(--border); border-radius: 1rem; }
  .room-a-card { border-color: #a9d8f4; background: var(--sky); }
  .room-b-card { border-color: #f0bbb8; background: var(--coral); }
  .dynamic-room-card { border-color: var(--room-border); background: var(--room-soft); }
  .room-number { position: absolute; top: -2.5rem; right: 0.5rem; color: rgba(17, 17, 17, 0.055); font-family: 'Noto Serif Thai', serif; font-size: 13rem; font-weight: 700; line-height: 1; }
  .checkin-card > div:not(.room-number), .checkin-card button { position: relative; z-index: 1; }
  .checkin-card h3 { margin: 0; color: var(--ink); font-family: 'Noto Serif Thai', serif; font-size: 2.2rem; font-weight: 600; }
  .checkin-card p:last-child { margin: 0.25rem 0 0; color: var(--ink-soft); }
  .checkin-card h3 + p { margin: 0.25rem 0 0; color: var(--ink-soft); }
  .checkin-card .room-hours { margin: 0.45rem 0 0; color: var(--room-accent); font-size: 0.72rem; font-weight: 700; }
  .location-note { display: flex; margin-top: 1rem; padding: 1rem 1.15rem; align-items: center; gap: 0.8rem; border: 1px solid var(--border); border-radius: 0.75rem; background: var(--surface); }
  .location-note > span { color: var(--blue); font-size: 1.4rem; }
  .location-note p { margin: 0; color: var(--muted); font-size: 0.73rem; line-height: 1.5; }
  .location-note strong { color: var(--ink); font-weight: 600; }

  /* Dialogs */
  .modal-dialog { width: min(32rem, calc(100% - 1.5rem)); max-height: calc(100vh - 2rem); margin: auto; padding: 0; overflow: visible; border: 0; background: transparent; color: var(--ink); }
  .modal-dialog::backdrop { background: rgba(17, 17, 17, 0.46); backdrop-filter: blur(3px); }
  .dialog-card { position: relative; max-height: calc(100vh - 2rem); padding: clamp(1.35rem, 4vw, 2rem); overflow-y: auto; border-radius: 1rem; }
  .dialog-close { position: absolute; top: 1rem; right: 1rem; width: 2rem; height: 2rem; border: 1px solid var(--border); border-radius: 0.38rem; background: var(--surface); color: var(--muted); cursor: pointer; font-size: 1.2rem; line-height: 1; }
  .dialog-close:hover { border-color: var(--border-strong); color: var(--ink); }
  .dialog-intro { margin-bottom: 0.5rem; }
  .approval-confirm-card { gap: 0.85rem; }
  .approval-confirm-summary { display: grid; padding: 0.9rem 1rem; gap: 0.28rem; border: 1px solid var(--border); border-radius: 0.65rem; font-size: 0.74rem; line-height: 1.55; }
  .approval-confirm-summary.warning { border-color: #e5c761; background: var(--marigold); color: #593b00; }
  .approval-confirm-summary.success { border-color: #9bcfaf; background: var(--mint); color: #1e6b36; }
  .approval-confirm-summary strong { color: inherit; font-size: 0.82rem; }
  .approval-confirm-summary span, .approval-confirm-summary small { color: inherit; }
  .approval-confirm-actions { display: grid; grid-template-columns: 1fr 1.35fr; gap: 0.65rem; }
  .approval-confirm-actions button { min-height: 2.7rem; }
  .booking-owner { display: flex; padding: 0.8rem; align-items: center; gap: 0.75rem; border: 1px solid var(--border); border-radius: 0.65rem; background: var(--surface-subtle); }
  .booking-owner > div { display: grid; }
  .booking-owner strong { color: var(--ink); font-size: 0.83rem; font-weight: 600; }
  .booking-owner small { color: var(--muted); font-size: 0.68rem; }
  .form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.85rem; }
  .field-full { grid-column: 1 / -1; }
  .rule-inline { padding: 0.65rem 0.8rem; border: 1px solid #badcf7; border-radius: 0.5rem; background: var(--blue-soft); color: #004f96; font-size: 0.7rem; text-align: center; }
  .form-feedback { padding: 0.68rem 0.8rem; border: 1px solid var(--border); border-radius: 0.5rem; font-size: 0.72rem; font-weight: 500; line-height: 1.55; }
  .form-feedback.info { border-color: #badcf7; background: var(--blue-soft); color: #004f96; }
  .form-feedback.success { border-color: #9bcfaf; background: var(--mint); color: #1e6b36; }
  .form-feedback.warning { border-color: #efd27a; background: var(--marigold); color: #6f4700; }
  .form-feedback.error { border-color: #f1aaa7; background: var(--coral); color: var(--danger); }
  .booking-form-alert {
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--border-strong);
    border-left-width: 4px;
    border-radius: 0.5rem;
    color: var(--ink);
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1.6;
  }
  .booking-form-alert[hidden] { display: none; }
  .booking-form-alert.info { border-color: #9ecdf0; border-left-color: var(--blue); background: var(--blue-soft); color: #004f96; }
  .booking-form-alert.warning { border-color: #e5c761; border-left-color: var(--marigold-strong); background: var(--marigold); color: #593b00; }
  .booking-form-alert.error { border-color: #eba5a2; border-left-color: var(--coral-strong); background: var(--coral); color: #8d2026; }

  .checkin-window { display: grid; margin-top: 0.9rem; padding: 0.72rem 0.8rem; gap: 0.18rem; border: 1px solid var(--border); border-radius: 0.5rem; background: rgba(255, 255, 255, 0.7); }
  .checkin-window strong { color: var(--ink); font-size: 0.72rem; font-weight: 700; }
  .checkin-window span { color: var(--ink-soft); font-size: 0.68rem; line-height: 1.5; }
  .checkin-window.success { border-color: #8fc9a6; background: rgba(221, 246, 232, 0.88); }
  .checkin-window.warning { border-color: #e5c761; background: rgba(255, 240, 199, 0.9); }
  .checkin-window.error { border-color: #eba5a2; background: rgba(255, 226, 224, 0.9); }
  .checkin-window.info { border-color: #a8d4f0; background: rgba(221, 246, 255, 0.9); }

  /* Feedback */
  .activity-status {
    position: fixed;
    z-index: 45;
    top: 5rem;
    left: 50%;
    display: flex;
    width: max-content;
    max-width: calc(100% - 2rem);
    min-height: 2.5rem;
    padding: 0.55rem 0.85rem;
    align-items: center;
    gap: 0.55rem;
    border: 1px solid #9ecdf0;
    border-radius: 999px;
    background: rgba(248, 252, 255, 0.97);
    box-shadow: 0 8px 24px rgba(4, 15, 50, 0.12);
    color: #004f96;
    font-size: 0.74rem;
    font-weight: 600;
    line-height: 1.35;
    text-align: center;
    transform: translateX(-50%);
  }
  .activity-spinner { width: 0.95rem; height: 0.95rem; flex: 0 0 auto; border-color: #b9d9ef; border-top-color: var(--blue); }
  .loading-overlay { position: fixed; z-index: 1000; inset: 0; display: flex; align-items: center; justify-content: center; padding: 1rem; background: rgba(246, 245, 244, 0.84); backdrop-filter: blur(3px); color: var(--ink); }
  .loading-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    width: min(28rem, 100%);
    padding: 1.1rem 1.15rem 0.9rem;
    align-items: center;
    gap: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: var(--surface);
    box-shadow: 0 18px 50px rgba(4, 15, 50, 0.14);
  }
  .loading-copy { display: grid; gap: 0.14rem; }
  .loading-copy strong { font-size: 0.84rem; font-weight: 700; }
  .loading-copy small { color: var(--muted); font-size: 0.68rem; line-height: 1.45; }
  .loading-progress { position: relative; grid-column: 1 / -1; height: 0.2rem; overflow: hidden; border-radius: 999px; background: var(--blue-soft); }
  .loading-progress i { position: absolute; inset-block: 0; width: 38%; border-radius: inherit; background: var(--blue); animation: loading-slide 1.2s ease-in-out infinite; }
  .spinner { width: 1.3rem; height: 1.3rem; border: 2px solid var(--border); border-top-color: var(--blue); border-radius: 50%; animation: spin 700ms linear infinite; }
  @keyframes spin { to { transform: rotate(360deg); } }
  @keyframes loading-slide { from { left: -38%; } to { left: 100%; } }
  .toast { position: fixed; z-index: 1100; right: 1rem; bottom: max(1rem, env(safe-area-inset-bottom)); width: min(27rem, calc(100% - 2rem)); padding: 0.9rem 1rem; border: 1px solid var(--border-strong); border-left: 4px solid var(--blue); border-radius: 0.5rem; background: var(--surface); color: var(--ink); cursor: pointer; font-size: 0.8rem; font-weight: 500; line-height: 1.55; }
  .toast.info { border-left-color: var(--blue); background: #f8fcff; }
  .toast.warning { border-left-color: var(--marigold-strong); background: #fffbef; color: #593b00; }
  .toast.error { border-left-color: var(--coral-strong); background: #fffafa; }
  .toast.success { border-left-color: var(--success); background: #fbfffc; }

  @media (max-width: 860px) {
    .auth-layout { grid-template-columns: 1fr; align-content: center; gap: 2.5rem; padding: 2.5rem 0; }
    .auth-story { max-width: 36rem; }
    .auth-story h1 { font-size: clamp(3.2rem, 12vw, 5rem); }
    .auth-story .brand-mark { display: none; }
    .story-copy { margin-bottom: 0; }
    .auth-card { max-width: 36rem; justify-self: start; }
    .user-copy { display: none; }
    .user-chip { padding-left: 0.6rem; }
    .studio-notice-inner { grid-template-columns: 1fr; }
    .app-content { grid-template-columns: 1fr; width: 100%; }
    .sidebar { position: sticky; z-index: 15; top: 4.5rem; height: auto; padding: 0.55rem 1rem; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--border); background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(16px); }
    .tab-list { display: flex; min-width: max-content; }
    .tab-button { min-height: 2.5rem; }
    .sidebar-note { display: none; }
    .dashboard-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .dashboard-schedule-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }

  @media (max-width: 620px) {
    .auth-layout { width: min(100% - 1.2rem, 36rem); gap: 1.7rem; padding: 1.6rem 0; }
    .auth-story h1 { font-size: 2.7rem; }
    .story-copy { margin-top: 1rem; font-size: 0.88rem; line-height: 1.65; }
    .feature-pills { display: none; }
    .auth-card { padding: 1.4rem; border-radius: 0.8rem; }
    .app-header { min-height: 7rem; padding: 0.55rem 0.8rem; flex-wrap: wrap; align-content: center; gap: 0.45rem; }
    .activity-status { top: 7.45rem; max-width: calc(100% - 1.2rem); font-size: 0.7rem; }
    .header-actions { display: grid; order: 3; grid-template-columns: repeat(3, minmax(0, 1fr)); width: 100%; gap: 0.42rem; }
    .header-actions.approver-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .header-actions .user-chip { display: none; }
    .quick-book, .header-action-button { width: 100%; min-width: 0; min-height: 2.45rem; padding: 0.45rem 0.3rem; font-size: 0.68rem; }
    .header-action-button svg { display: none; }
    .action-label-wide { display: none; }
    .action-label-compact { display: inline; }
    .studio-notice-panel { grid-template-columns: 1.8rem minmax(0, 1fr); padding: 0.8rem; gap: 0.65rem; }
    .studio-notice-icon { width: 1.8rem; height: 1.8rem; }
    .booking-rule-list { grid-template-columns: 1fr; }
    .sidebar { top: 7rem; }
    .workspace { padding: 1.25rem 0.75rem 1.5rem; }
    .section-heading { align-items: flex-start; flex-direction: column; margin-bottom: 1.3rem; }
    .section-heading h2 { font-size: 1.85rem; }
    .legend { justify-content: flex-start; }
    .dashboard-heading { align-items: flex-start; }
    .dashboard-stats { gap: 0.55rem; }
    .dashboard-stat { min-height: 7.8rem; padding: 0.8rem; }
    .dashboard-stat > strong { font-size: 1.7rem; }
    .dashboard-card-heading { align-items: flex-start; }
    .dashboard-action-item { grid-template-columns: auto minmax(0, 1fr); }
    .dashboard-wait-time { grid-column: 2; }
    .dashboard-legend { justify-content: flex-start; }
    .dashboard-schedule-list { grid-template-columns: 1fr; padding: 0.75rem; }
    .calendar-card { padding: 0.7rem; border-radius: 0.75rem; }
    .fc .fc-toolbar { align-items: flex-start; flex-wrap: wrap; }
    .fc .fc-toolbar-chunk:nth-child(2) { order: -1; width: 100%; }
    .fc .fc-toolbar-title { font-size: 1rem; }
    .fc .fc-button { padding: 0.36rem 0.5rem !important; }
    .booking-item { grid-template-columns: 3.3rem minmax(0, 1fr); gap: 0.75rem; }
    .booking-item .status-chip { grid-column: 1 / -1; justify-self: start; }
    .approval-item { grid-template-columns: 3.5rem minmax(0, 1fr); }
    .approval-room { width: 2.7rem; height: 2.7rem; }
    .approval-actions { grid-column: 1 / -1; width: 100%; }
    .approval-actions button { flex: 1; }
    .approval-confirm-actions { grid-template-columns: 1fr; }
    .room-management-item { grid-template-columns: 3rem minmax(0, 1fr); padding: 0.9rem; }
    .room-admin-number { width: 3rem; height: 3rem; }
    .room-edit-button { grid-column: 1 / -1; width: 100%; }
    .checkin-grid { grid-template-columns: 1fr; }
    .checkin-card { min-height: 16rem; }
    .toast { right: 0.6rem; bottom: max(0.6rem, env(safe-area-inset-bottom)); width: calc(100% - 1.2rem); padding: 0.85rem 0.9rem; font-size: 0.78rem; }
    .form-grid { grid-template-columns: 1fr; }
    .field-full { grid-column: auto; }
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  }