:root {
  --bg: #0F1420;
  --panel: #161D2E;
  --panel-2: #1D2740;
  --panel-dim: #12161f;
  --selected-bg: #1D2C55;
  --border: #2A3550;
  --text: #E8ECF7;
  --text-dim: #93A0C0;
  --text-dimmer: #5c6680;
  --accent: #4F7DFF;
  --accent-2: #6F97FF;
  --success: #35C98F;
  --danger: #EF5468;
  --warning: #E8B93B;
  --on-accent: #E8ECF7;
  --on-warm: #0F1420;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* admin login gate */
#appScreen { display: none; }
#appScreen.visible { display: block; }

#loginScreen { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 40px; width: 100%; max-width: 360px; text-align: center; }
.login-logo { font-size: 2rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.login-logo span { color: var(--accent); }
.login-sub { color: var(--text-dim); font-size: .8rem; margin-bottom: 28px; }
#loginScreen input {
  width: 100%; background: var(--bg); border: 1.5px solid var(--border); border-radius: 8px;
  color: var(--text); font-size: 1rem; padding: 12px 16px; outline: none; text-align: center;
  letter-spacing: .2em; margin-bottom: 14px; transition: border-color .2s;
}
#loginScreen input:focus { border-color: var(--accent); }
.btn-login {
  width: 100%; background: var(--accent); color: var(--on-accent); border: none; border-radius: 8px;
  font-weight: 700; font-size: .95rem; padding: 13px; cursor: pointer; transition: opacity .15s;
}
.btn-login:hover { opacity: .85; }
.login-err { color: var(--danger); font-size: .8rem; margin-top: 10px; min-height: 18px; }

.sidebar-footer { margin-top: auto; display: flex; flex-direction: column; gap: 4px; }
.btn-sidebar-link { background: none; border: none; color: var(--text-dim); font-size: 12px; text-align: left; padding: 6px 4px; cursor: pointer; }
.btn-sidebar-link:hover { color: var(--accent); }

.app-shell {
  display: flex;
  align-items: stretch;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 32px 22px;
  background: var(--panel);
  border-right: 1px solid var(--border);
}

.brand { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }

.brand-mark {
  height: 150px;
  width: auto;
  display: block;
}

.brand-mark-fallback {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--accent);
}


.tabs { display: flex; flex-direction: column; gap: 4px; }

.tab-btn {
  border: 1px solid transparent;
  background: transparent;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 14px;
  text-align: left;
  color: var(--text-dim);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}

.tab-btn:hover { border-color: var(--accent); color: var(--text); }
.tab-btn.active { background: var(--selected-bg); color: var(--accent-2); }

main#app {
  flex: 1; min-width: 0; padding: 24px 32px 64px;
  display: flex; flex-direction: column;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }
#tab-schedule.active { display: flex; flex-direction: column; flex: 1; min-height: 0; }

.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.panel-toolbar h2 { margin: 0; font-size: 18px; color: var(--accent); }

/* dashboard */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.dash-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.dash-card-wide { grid-column: 1 / -1; }

.dash-card-label { font-size: 13px; color: var(--text-dim); font-weight: 600; margin-bottom: 8px; }

.dash-card-value { font-size: 26px; font-weight: 700; color: var(--text); }

.dash-card-danger .dash-card-value { color: var(--danger); }

.dash-progress {
  margin-top: 10px; height: 6px; border-radius: 999px; background: var(--panel-2); overflow: hidden;
}
.dash-progress-bar { height: 100%; background: var(--accent); border-radius: 999px; transition: width .3s ease; }

.dash-list { display: flex; flex-direction: column; gap: 2px; }

.dash-list-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 2px; border-bottom: 1px solid var(--border);
}
.dash-list-row:last-child { border-bottom: none; }

.dash-list-time { font-weight: 700; color: var(--accent); font-size: 13px; flex-shrink: 0; width: 46px; }
.dash-list-main { flex: 1; min-width: 0; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dash-list-sub { color: var(--text-dim); font-size: 13px; flex-shrink: 0; }
.dash-list-amount { color: var(--danger); font-weight: 700; font-size: 13px; flex-shrink: 0; }
.dash-list-empty { color: var(--text-dim); font-size: 13px; padding: 8px 2px; margin: 0; }

input[type="search"], input[type="text"], input[type="email"], input[type="tel"],
input[type="number"], input[type="date"], input[type="time"], select, textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  outline: none;
}

input:focus, select:focus, textarea:focus { border-color: var(--accent); }

#customer-search { width: 320px; max-width: 60vw; }

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 600;
  transition: opacity .15s, background .15s;
}

.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-2); }

.btn-ghost { background: var(--panel-2); color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--text); }

.btn-link { background: none; color: var(--accent); padding: 6px 0; font-weight: 600; text-decoration: underline; }

.btn-sm { padding: 6px 10px; font-size: 12px; border-radius: 6px; }
.btn-danger { background: var(--panel-2); color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background: var(--danger); color: var(--on-accent); }

.table-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }

.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { text-align: left; padding: 12px 16px; font-size: 14px; border-bottom: 1px solid var(--border); }
.data-table th { color: var(--text-dim); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .4px; background: var(--bg); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--panel-2); cursor: default; }
.data-table td.actions { white-space: nowrap; text-align: right; }
.row-clickable { cursor: pointer; }

.empty-state { padding: 32px; text-align: center; color: var(--text-dim); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; border: 1px solid transparent; }
.badge-paid { background: var(--success); color: var(--on-warm); }
.badge-partial { background: transparent; color: var(--warning); border-color: var(--warning); }
.badge-unpaid { background: transparent; color: var(--danger); border-color: var(--danger); }
.badge-cancelled { background: var(--panel-2); color: var(--text-dim); }
.badge-active { background: var(--selected-bg); color: var(--accent-2); border-color: var(--accent); }

/* modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal { background: var(--panel); border-radius: 14px; width: 100%; max-width: 480px; max-height: 88vh; overflow-y: auto; box-shadow: 0 10px 40px rgba(0,0,0,.5); border: 1px solid var(--border); }
.modal.modal-wide { max-width: min(1040px, 92vw); }

.form-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.form-cols .form-grid { grid-template-columns: 1fr 1fr; }
@media (max-width: 720px) {
  .form-cols { grid-template-columns: 1fr; gap: 0; }
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; font-size: 17px; color: var(--text); }
.modal-close { background: none; border: none; font-size: 22px; color: var(--text-dim); cursor: pointer; line-height: 1; }
.modal-body { padding: 20px 22px; }

.form-row { margin-bottom: 14px; display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 13px; color: var(--text-dim); font-weight: 600; }
.form-row-checkbox label { display: flex; align-items: center; gap: 8px; font-weight: 400; color: var(--text); cursor: pointer; }
.form-row-checkbox input[type="checkbox"] { width: auto; accent-color: var(--accent); }
.form-row input, .form-row select, .form-row textarea { width: 100%; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.form-hint { font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }

.schedule-slot-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.schedule-slot-row .slot-weekday { flex: 1.3; }
.schedule-slot-row .slot-time { flex: 1; }
.btn-remove-slot {
  flex-shrink: 0; width: 32px; height: 32px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text-dim); font-size: 16px; line-height: 1; cursor: pointer;
}
.btn-remove-slot:hover { border-color: var(--danger); color: var(--danger); }
.form-error { color: var(--danger); font-weight: 600; font-size: 13px; margin-top: -6px; margin-bottom: 12px; display: none; }
.form-error.visible { display: block; }

/* toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: var(--on-accent); padding: 12px 20px; border-radius: 8px;
  font-size: 14px; z-index: 200; box-shadow: var(--shadow); font-weight: 600;
}
.toast.error { background: var(--danger); color: var(--on-accent); }

/* customer detail */
.detail-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 22px; margin-bottom: 20px; box-shadow: var(--shadow); }
.detail-card h2 { margin: 0 0 4px; color: var(--text); }
.detail-meta { color: var(--text-dim); font-size: 14px; display: flex; gap: 18px; flex-wrap: wrap; margin-top: 8px; }

.contact-link { cursor: pointer; text-decoration: underline; text-decoration-style: dotted; text-underline-offset: 2px; }
.contact-link:hover { color: var(--accent); }

.contact-choice { display: flex; flex-direction: column; gap: 10px; }
.contact-choice-btn { display: flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; }
.section-title { font-size: 15px; font-weight: 700; margin: 26px 0 10px; color: var(--accent); }

/* schedule toolbar */
.schedule-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.schedule-nav { display: flex; align-items: center; gap: 10px; }
.schedule-nav h2 { margin: 0; font-size: 16px; color: var(--accent); white-space: nowrap; }
.schedule-actions { display: flex; align-items: center; gap: 10px; }
.btn-icon {
  width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--accent); font-size: 20px; line-height: 1;
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  flex-shrink: 0;
}
.btn-icon:hover { border-color: var(--accent); }
.btn-fab {
  width: 34px; height: 34px; border-radius: 50%; border: none;
  background: var(--accent); color: var(--on-accent); font-size: 20px; line-height: 1;
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  flex-shrink: 0;
}
.btn-fab:hover { background: var(--accent-2); }

/* month calendar */
.calendar-wrap {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
  overflow: hidden; flex: 1; display: flex; flex-direction: column; min-height: 0;
}
.calendar-grid.month {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  flex: 1;
  min-height: 480px;
}
.cal-month-head {
  background: var(--bg);
  text-align: center;
  padding: 8px 2px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .3px;
}
.cal-month-head.is-sunday { color: var(--text-dimmer); }
.cal-day {
  background: var(--panel);
  min-height: 68px;
  padding: 4px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: background .1s;
}
.cal-day:hover { background: var(--panel-2); }
.cal-day.other-month { background: var(--bg); }
.cal-day.other-month:hover { background: var(--panel-2); }
.cal-day.is-sunday:not(.other-month) { background: var(--panel-dim); }
.cal-day.drag-over { background: var(--panel-2); box-shadow: inset 0 0 0 2px var(--accent); }
.cal-day-number {
  align-self: flex-start;
  font-size: 12px; font-weight: 600; color: var(--text);
  width: 20px; height: 20px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.cal-day.other-month .cal-day-number { color: var(--text-dim); font-weight: 400; }
.cal-day-number.is-today { background: var(--accent); color: var(--on-accent); }
.cal-day-chips { display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.cal-mini-chip {
  background: var(--accent); color: var(--on-accent); font-size: 9px; font-weight: 600;
  padding: 2px 4px; border-radius: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  cursor: grab;
}
.cal-mini-chip.dragging { opacity: 0.35; }
.cal-mini-chip.is-gift { background: var(--warning); color: var(--on-warm); }
.cal-more { font-size: 9px; color: var(--text-dim); font-weight: 700; padding-left: 2px; }

/* day detail modal */
.day-detail-list { max-height: 45vh; overflow-y: auto; margin-bottom: 12px; }
.day-detail-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 4px; border-bottom: 1px solid var(--border); cursor: pointer;
}
.day-detail-row:hover { background: var(--panel-2); }
.day-detail-row:last-child { border-bottom: none; }
.ddr-time { font-weight: 700; font-size: 13px; flex-shrink: 0; color: var(--accent); }
.ddr-name { flex: 1; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ddr-pkg { font-size: 12px; color: var(--text-dim); flex-shrink: 0; }

@media (min-width: 721px) {
  .cal-day { min-height: 100px; padding: 6px; }
  .cal-mini-chip { font-size: 11px; padding: 3px 6px; }
  .cal-more { font-size: 10px; }
}

.mobile-topbar { display: none; }
.sidebar-overlay { display: none; }

@media (max-width: 720px) {
  .app-shell { flex-direction: column; min-height: 0; }

  .mobile-topbar {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 20;
  }
  .btn-hamburger {
    background: none; border: none; color: var(--text); font-size: 22px;
    line-height: 1; padding: 6px 8px; cursor: pointer; border-radius: 6px;
  }
  .btn-hamburger:hover { background: var(--panel-2); }
  .mobile-topbar-logo { height: 34px; width: auto; }

  .sidebar-overlay {
    display: block; position: fixed; inset: 0; background: rgba(0,0,0,.5);
    z-index: 25; opacity: 0; pointer-events: none; transition: opacity .2s ease;
  }
  .app-shell.sidebar-open .sidebar-overlay { opacity: 1; pointer-events: auto; }

  .sidebar {
    position: fixed; top: 0; left: 0; height: 100vh; width: 78vw; max-width: 300px;
    z-index: 30; flex-direction: column; align-items: stretch;
    border-right: 1px solid var(--border); border-bottom: none;
    padding: 24px 18px; gap: 24px;
    transform: translateX(-100%); transition: transform .25s ease;
    box-shadow: 2px 0 24px rgba(0,0,0,.4);
  }
  .app-shell.sidebar-open .sidebar { transform: translateX(0); }

  .brand-mark { height: 60px; }
  .brand-mark-fallback { font-size: 15px; }
  main#app { padding: 16px 16px 48px; }
  .form-grid { grid-template-columns: 1fr; }
  #customer-search { width: 100%; }
  .schedule-nav h2 { font-size: 14px; }

  .tabs { flex-direction: column; gap: 4px; }
  .tab-btn { padding: 12px 14px; font-size: 15px; text-align: left; }

  .sidebar-footer { flex-direction: column; margin-top: auto; gap: 4px; }
  .btn-sidebar-link { font-size: 13px; padding: 10px 4px; text-align: left; }

  .dashboard-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .dash-card { padding: 14px 16px; }
  .dash-card-value { font-size: 21px; }
  .dash-list-row { flex-wrap: wrap; gap: 4px 10px; }
  .dash-list-sub { width: 100%; order: 3; }

  /* stack data tables into cards */
  .data-table thead { display: none; }
  .data-table, .data-table tbody, .data-table tr, .data-table td { display: block; width: 100%; }
  .data-table tr { padding: 10px 16px; border-bottom: 1px solid var(--border); }
  .data-table tbody tr:last-child { border-bottom: none; }
  .data-table td { border-bottom: none; padding: 4px 0; display: flex; justify-content: space-between; align-items: center; gap: 12px; text-align: right; }
  .data-table td::before { content: attr(data-label); font-weight: 600; color: var(--text-dim); font-size: 12px; text-align: left; }
  .data-table td.actions { justify-content: flex-end; padding-top: 8px; }
  .data-table td.actions::before { content: none; }
  .data-table td[colspan] { display: block; text-align: center; }
  .data-table td[colspan]::before { content: none; }
}