:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #ffffff;
  --border: #dedad2;
  --text: #16171b;
  --text-dim: #85858c;
  --ink: #000938;
  --on-ink: #faf9f6;
  --danger: #d1453b;
  --danger-dim: rgba(209, 69, 59, 0.12);
  --radius: 20px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000938;
    --surface: #0d1652;
    --border: #283569;
    --text: #f3f2ee;
    --text-dim: #9aa2c4;
    --ink: #f3f2ee;
    --on-ink: #000938;
    --danger: #ff6b61;
    --danger-dim: rgba(255, 107, 97, 0.14);
  }
}

:root[data-theme="dark"] {
  --bg: #000938;
  --surface: #0d1652;
  --border: #283569;
  --text: #f3f2ee;
  --text-dim: #9aa2c4;
  --ink: #f3f2ee;
  --on-ink: #000938;
  --danger: #ff6b61;
  --danger-dim: rgba(255, 107, 97, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

button, input, textarea {
  font-family: inherit;
  color: inherit;
}

[hidden] { display: none !important; }

/* ---------- Auth screen ---------- */
#auth-screen,
#reset-request-screen,
#reset-password-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-card {
  width: 320px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.auth-logo {
  display: block;
  height: 162px;
  width: auto;
  margin: 0 auto 8px;
}

.auth-card p.sub {
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
  margin: 0 0 20px;
}

.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 5px;
}

.field input {
  width: 100%;
  padding: 10px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 14px;
}

.field input:focus {
  outline: none;
  border-width: 1.5px;
  border-color: var(--ink);
}

.password-field-row {
  position: relative;
}

.password-field-row input {
  padding-right: 40px;
}

.password-toggle-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 15px;
  padding: 6px 8px;
  opacity: 0.5;
  filter: grayscale(1);
}

.password-toggle-btn.active {
  opacity: 1;
  filter: none;
}

#forgot-password-btn {
  display: block;
  margin: 10px auto 0;
  font-size: 12px;
  border: none;
  outline: none;
}

#forgot-password-btn:focus-visible {
  text-decoration: underline;
}

.btn {
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 700;
}

.btn-primary {
  background: var(--ink);
  color: var(--on-ink);
  width: 100%;
  margin-top: 6px;
}

.btn-text {
  background: none;
  color: var(--text);
  font-weight: 600;
  padding: 4px;
}

.auth-toggle {
  text-align: center;
  margin-top: 16px;
}

.auth-toggle .btn-text {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 13px;
}

.auth-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
  min-height: 16px;
  text-align: center;
}

/* ---------- App shell ---------- */
#app {
  display: grid;
  grid-template-columns: 240px 1fr;
  height: 100vh;
}

#sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 10px;
  overflow-y: auto;
}

.sidebar-logo {
  display: block;
  height: 96px;
  width: auto;
  margin: 4px auto 8px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px 14px;
}

.sidebar-header h2 {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
}

.icon-btn {
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text-dim);
  font-size: 15px;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  border-color: var(--border);
  color: var(--text);
}

#category-settings-btn {
  font-size: 30px;
  width: 40px;
  height: 40px;
}

#category-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 5px;
  user-select: none;
  border: 1px solid var(--border);
}

.category-item:hover {
  border-color: var(--ink);
}

.category-item.active {
  background: var(--ink);
  color: var(--on-ink);
  border-color: var(--ink);
}

.category-item .drag-handle {
  color: inherit;
  opacity: 0;
  cursor: grab;
  font-size: 12px;
}

.category-item:hover .drag-handle {
  opacity: 0.6;
}

.category-item .cat-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 12px;
}

.category-item .cat-count {
  font-size: 11px;
  opacity: 0.7;
}

.category-item .cat-gear {
  opacity: 0.7;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transform: translateY(-1px);
}

.category-item:hover .cat-gear {
  opacity: 1;
}

.category-item.drag-over {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.sidebar-footer #user-email {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

#sign-out-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

#sign-out-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.theme-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}

.theme-toggle button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  font-size: 12px;
  padding: 5px 9px;
  border-radius: 999px;
  line-height: 1;
}

.theme-toggle button.active {
  background: var(--ink);
  color: var(--on-ink);
}

/* ---------- Main panel ---------- */
#main {
  overflow-y: auto;
  padding: 32px 40px 60px;
  background: var(--bg);
  color: var(--text);
}

#main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

#main-header h1 {
  font-size: 15px;
  font-weight: 800;
  margin: 0;
  padding: 10px 22px;
  background: var(--ink);
  color: var(--on-ink);
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#clear-completed-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

#clear-completed-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

#empty-state {
  color: var(--text-dim);
  text-align: center;
  margin-top: 80px;
  font-size: 14px;
}

/* Add task row */
#add-task-form {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 8px 8px 18px;
  margin-bottom: 24px;
}

#add-task-input {
  flex: 1;
  border: none;
  background: none;
  font-size: 14px;
  outline: none;
}

#add-task-due {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 12px;
  background: var(--bg);
  color: var(--text-dim);
}

#add-task-form button[type="submit"] {
  background: var(--ink);
  color: var(--on-ink);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  font-size: 15px;
  cursor: pointer;
  flex-shrink: 0;
}

/* Task list */
#task-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.task-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  margin-bottom: 6px;
  border: 1px solid var(--border);
}

.task-row:hover {
  border-color: var(--ink);
}

.task-row .drag-handle {
  color: var(--text-dim);
  opacity: 0;
  cursor: grab;
  font-size: 12px;
  width: 12px;
  flex-shrink: 0;
}

.task-row:hover .drag-handle {
  opacity: 1;
}

.drag-handle-spacer {
  width: 12px;
  flex-shrink: 0;
}

.task-row.drag-over {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.checkbox {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--ink);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  padding: 0;
}

.checkbox.checked {
  background: var(--ink);
  border-color: var(--ink);
}

.checkbox.checked::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid var(--on-ink);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

.task-row.done .checkbox {
  border-color: var(--text-dim);
}

.task-row.done .checkbox.checked {
  background: var(--text-dim);
  border-color: var(--text-dim);
}

.task-title {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: text;
}

.task-title:hover {
  text-decoration: underline solid;
  text-decoration-color: var(--text-dim);
}

.task-title-input {
  flex: 1;
  font-size: 14px;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  padding: 3px 10px;
  background: var(--surface);
  color: var(--text);
}

.task-row.done .task-title {
  color: var(--text-dim);
  font-weight: 500;
}

.task-due-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  color: var(--text-dim);
  opacity: 0.7;
}

.task-due-btn:hover {
  opacity: 1;
}

.task-due-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.due-badge-text {
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.task-due-btn.overdue {
  color: var(--danger);
  opacity: 1;
}

.due-badge-input {
  font-size: 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  background: var(--surface);
  color: var(--text);
}

.task-notes-btn {
  opacity: 0.6;
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  color: var(--text-dim);
}

.task-notes-btn svg {
  width: 16px;
  height: 16px;
  display: block;
}

.task-notes-btn.has-notes,
.task-notes-btn.active {
  opacity: 1;
  color: var(--ink);
}

.task-notes-row {
  padding: 0 16px 12px 42px;
}

.task-notes-input {
  width: 100%;
  min-height: 50px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 9px 12px;
  font-size: 13px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
}

.task-notes-input:focus {
  outline: none;
  border-width: 1.5px;
  border-color: var(--ink);
}

.task-delete-btn {
  opacity: 0;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 15px;
  padding: 2px 4px;
}

.task-row:hover .task-delete-btn {
  opacity: 1;
}

.task-delete-btn:hover {
  color: var(--danger);
}

.section-divider {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 20px 0 10px 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  justify-content: center;
  z-index: 10;
  overflow-y: auto;
  padding: 24px 16px;
}

.modal {
  width: 340px;
  max-width: 100%;
  margin: auto 0;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 22px;
  border: 1px solid var(--border);
}

.modal h3 {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.radio-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  margin-bottom: 8px;
  cursor: pointer;
}

.radio-option.selected {
  border-color: var(--ink);
  border-width: 2px;
  padding: 13px 15px;
}

.radio-option input {
  accent-color: var(--ink);
}

.radio-option .opt-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.radio-option .opt-desc {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  margin: 4px 0 12px;
  cursor: pointer;
}

.checkbox-row input {
  accent-color: var(--ink);
}

.color-field-row {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 8px 8px 16px;
  margin-bottom: 4px;
}

.color-field-row input[type="color"] {
  width: 30px;
  height: 30px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: none;
  cursor: pointer;
  flex-shrink: 0;
}

.color-name {
  flex: 1;
  font-size: 13px;
  font-weight: 700;
}

.color-reset-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
  padding: 4px 6px;
}

.color-reset-btn:hover {
  color: var(--ink);
}

.modal-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.modal-actions-row {
  display: flex;
  justify-content: center;
  gap: 10px;
  width: 100%;
}

.modal-actions-row .btn {
  flex: 1;
  width: auto;
  max-width: 140px;
  margin-top: 0;
  text-align: center;
}

.btn-secondary {
  background: var(--bg);
  border: 1px solid var(--border);
}

.btn-danger {
  background: none;
  padding: 10px 4px;
  color: var(--danger);
}

/* ---------- Mobile ---------- */
@media (max-width: 600px) {
  .auth-logo {
    height: 243px;
  }

  .sidebar-logo {
    height: 144px;
  }
}

/* ---------- Support chat widget ---------- */
.support-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--on-ink);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
  z-index: 20;
  transition: transform 0.15s ease;
}

.support-fab:hover {
  transform: scale(1.06);
}

.support-fab svg {
  width: 24px;
  height: 24px;
}

.support-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 360px;
  max-width: calc(100vw - 32px);
  height: 520px;
  max-height: calc(100vh - 48px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.32);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 21;
}

.support-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.support-panel-header .icon-btn {
  color: var(--on-ink);
}

.support-panel-header .icon-btn:hover {
  border-color: var(--on-ink);
}

.support-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.support-msg {
  max-width: 84%;
  padding: 9px 13px;
  border-radius: 16px;
  font-size: 13.5px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.support-msg.assistant {
  align-self: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

.support-msg.user {
  align-self: flex-end;
  background: var(--ink);
  color: var(--on-ink);
  border-bottom-right-radius: 4px;
}

.support-typing {
  display: flex;
  gap: 4px;
  padding: 4px 2px;
}

.support-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  animation: support-bounce 1.2s infinite ease-in-out;
}

.support-typing span:nth-child(2) {
  animation-delay: 0.15s;
}

.support-typing span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes support-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}

.support-status {
  padding: 8px 16px;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}

.support-input-row {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.support-input-row input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 13.5px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}

.support-send-btn {
  background: var(--ink);
  color: var(--on-ink);
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.support-send-btn:hover {
  border-color: var(--ink);
}

.support-send-btn svg {
  width: 16px;
  height: 16px;
}

@media (max-width: 600px) {
  .support-panel {
    right: 12px;
    left: 12px;
    width: auto;
    bottom: 12px;
    height: calc(100vh - 24px);
    max-height: none;
  }

  .support-fab {
    right: 16px;
    bottom: 16px;
  }
}