*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-0: #111114;
  --bg-1: #1a1a1f;
  --bg-2: #242429;
  --bg-3: #2e2e35;
  --bg-4: #3a3a42;
  --text-0: #f0f0f4;
  --text-1: #b8b8c8;
  --text-2: #7a7a8e;
  --accent: #5b7cf7;
  --accent-dim: rgba(91,124,247,0.18);
  --accent-hover: #7090ff;
  --green: #3ecf8e;
  --yellow: #f5a623;
  --red: #ef5350;
  --border: rgba(255,255,255,0.07);
  --border-light: rgba(255,255,255,0.12);
  --radius: 8px;
  --sidebar-w: 56px;
  --panel-w: 300px;
  --transition: 0.18s ease;

  --priority-0: #4b4b5e;
  --priority-1: #3b6ea0;
  --priority-2: #2e86c1;
  --priority-3: #d4ac0d;
  --priority-4: #e67e22;
  --priority-5: #e74c3c;
  ,
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-0);
  color: var(--text-0);
  height: 100vh;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.5;
  transition-duration 0.12s
}

/* ────── Layout ────── */
.layout {
  display: flex;
  height: 100vh;
}

/* ────── Sidebar (narrow icon bar) ────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 0;
  gap: 6px;
  z-index: 200;
  flex-shrink: 0;
}

.sidebar-btn {
  width: 38px;
  height: 38px;
  border: none;
  background: transparent;
  color: var(--text-2);
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: background var(--transition), color var(--transition);
  &.accent {
    color: var(--accent);
    &:hover {
      background: var(--accent-dim);
      color: var(--accent-hover);
    }
  }
  &:hover, &.active {
    background: var(--bg-3);
    color: var(--text-0);
  }
}

/* ────── Side Panel ────── */
.side-panel {
  width: var(--panel-w);
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: absolute;
  left: var(--sidebar-w);
  top: 0;
  height: 100vh;
  z-index: 150;
  transform: translateX(calc(-100% - var(--sidebar-w)));
  transition: transform var(--transition);
  overflow: hidden;
  &.open {
    transform: translateX(0);
  }
}
.panel-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-shrink: 0;
}
.panel-workspace-name {
  border: none;
  background: transparent;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-0);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  padding: 4px 6px;
  margin-left: -6px;
  border-radius: 6px;
  &:hover {
    background: var(--bg-3);
  }
}
.panel-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  }
.workspace-add-btn {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--accent);
  border-radius: 6px;
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  &:hover {
    background: var(--accent-dim);
    color: var(--accent-hover);
  }
}
.panel-close {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--text-2);
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition);
  &:hover {
    background: var(--bg-3);
    color: var(--text-0);
  }
}
/* New task button in panel */
.new-task-btn {
  margin: 12px 12px 8px;
  padding: 9px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: background var(--transition), transform 0.1s;
  &:hover {
    background: var(--accent-hover);
  }
  &:active {
    transform: scale(0.97);
  }
}
/* Panel sections */
.panel-body {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.list-section {
  border-bottom: 1px solid var(--border);
}
.list-label {
  padding: 10px 14px 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}
.list-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.task-item {
  padding: 9px 14px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 3px;
  justify-content: space-between;
  --bgleft: var(--bg-1);
  --bgright: var(--bg-1);
  background: linear-gradient(to right,var(--bgleft),color-mix(in srgb,var(--bgleft) 60%,var(--bgright)));
  &:hover {
    --bgleft: var(--bg-3);
  }
  &.active {
    border-left: 3px solid transparent;
    --bgleft: var(--accent-dim);
    border-left-color: var(--accent);
  }
  &.task-priority-0 {--bgright: var(--priority-0);}
  &.task-priority-1 {--bgright: var(--priority-1);}
  &.task-priority-2 {--bgright: var(--priority-2);}
  &.task-priority-3 {--bgright: var(--priority-3);}
  &.task-priority-4 {--bgright: var(--priority-4);}
  &.task-priority-5 {--bgright: var(--priority-5);}
}
.task-item-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-0);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.task-item-meta {
  font-size: 11px;
  color: var(--text-2);
  display: flex;
  gap: 8px;
}

.status-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  letter-spacing: 0.03em;
}
.status-未着手  {
  background: rgba(122,122,142,0.2);
  color: var(--text-2);
  }
.status-着手中  {
  background: rgba(91,124,247,0.2);
  color: var(--accent);
  }
.status-凍結   {
  background: rgba(245,166,35,0.2);
  color: var(--yellow);
  }
.status-完了   {
  background: rgba(62,207,142,0.2);
  color: var(--green);
  }

/* Empty state in panel */
.panel-empty {
  padding: 24px 16px;
  color: var(--text-2);
  font-size: 12px;
  text-align: center;
  line-height: 1.7;
}

/* ────── Overlay ────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 140;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  &.active {
    opacity: 1;
    pointer-events: all;
  }
}
/* ────── Main Area ────── */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Empty state (no tasks) */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-2);
  h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-1);
  }
  p {
    font-size: 13px;
    line-height: 1.7;
    text-align: center;
    max-width: 320px;
  }
}
.empty-state-icon {
  font-size: 52px;
  opacity: 0.35;
}
.empty-state-btn {
  margin-top: 8px;
  padding: 10px 22px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  transition: background var(--transition);
  &:hover {
    background: var(--accent-hover);
  }
}
/* Task editor */
.task-editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.task-top-bar {
  padding: 20px 28px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.task-title-display {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-0);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  margin: -4px -8px 0;
  word-break: break-word;
  &:hover {
    background: var(--bg-2);
  }
}
.task-title-input {
  width: 100%;
  font-size: 26px;
  font-weight: 700;
  background: transparent;
  color: var(--text-0);
  border: none;
  border-bottom: 2px solid var(--accent);
  padding: 4px 0;
  font-family: inherit;
  outline: none;
}

.task-meta-row {
  display: flex;
  gap: 20px;
  margin-top: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.meta-chip {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.meta-chip-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.meta-chip-value {
  text-align:center;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-2);
  cursor: pointer;
  transition: background var(--transition);
  color: var(--text-0);
  &:hover {
    background: var(--bg-3);
  }
  &.active {
    background: var(--bg-4);
    outline: 2px solid var(--accent);
  }
}
.task-delete-btn {
  margin-left: auto;
  align-self: flex-end;
  padding: 6px 10px;
  border: 1px solid rgba(239,83,80,0.45);
  border-radius: 6px;
  background: transparent;
  color: var(--red);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  &:hover:not(:disabled) {
    background: var(--red);
    border-color: var(--red);
    color: #fff;
  }
  &:disabled {
    cursor: wait;
    opacity: 0.65;
  }
}
/* ────── Meta Popup ────── */
.meta-popup-anchor {
  position: relative;
  }
.meta-popup {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 220px;
  background: var(--bg-2);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.55);
  z-index: 300;
  overflow: hidden;
  animation: popupIn 0.12s ease;
}
@keyframes popupIn {
  from { opacity:0; transform:translateY(-4px); }
  to   { opacity:1; transform:translateY(0); }
}
.meta-popup-header {
  padding: 10px 13px 6px;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-2);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}
/* Status popup */
.status-add-row {
  display: flex;
  gap: 6px;
  padding: 8px 10px 6px;
  border-bottom: 1px solid var(--border);
}
.status-add-input {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text-0);
  padding: 5px 9px;
  font-family: inherit;
  font-size: 13px;
  outline: none;
  &:focus {
    border-color: var(--accent);
  }
}
.status-add-btn {
  padding: 5px 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  &:hover {
    background: var(--accent-hover);
  }
}
.status-option {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.1s;
  &:hover {
    background: var(--bg-3);
  }
  &.selected {
    background: var(--accent-dim);
  }
}
.status-option-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}
/* Priority popup */
.priority-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  padding: 12px;
}
.priority-btn {
  aspect-ratio: 1;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  transition: transform 0.1s, box-shadow 0.1s;
  display: flex; align-items: center; justify-content: center;
  &:hover {
    transform: scale(1.08);
  }
  &.selected {
    box-shadow: 0 0 0 2px #fff;
  }
}
/* Progress popup */
.progress-body {
  padding: 14px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  }
.progress-number-row {
  display: flex;
  align-items: center;
  gap: 8px;
  }
.progress-num-input {
  width: 64px;
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text-0);
  padding: 5px 9px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  text-align: right;
  outline: none;
  &:focus {
    border-color: var(--accent);
  }
}
.progress-slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
}
.progress-bar-track {
  height: 6px;
  background: var(--bg-4);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.1s;
}
.progress-save-btn {
  align-self: flex-end;
  padding: 6px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  &:hover {
    background: var(--accent-hover);
  }
}
/* DueDate popup */
.duedate-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  }
.duedate-input {
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text-0);
  padding: 7px 10px;
  font-family: inherit;
  font-size: 13px;
  outline: none;
  width: 100%;
  color-scheme: dark;
  &:focus {
    border-color: var(--accent);
  }
}
.duedate-btns {
  display: flex;
  gap: 7px;
  justify-content: flex-end;
  }
.duedate-clear-btn {
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text-2);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  &:hover {
    background: var(--bg-3);
    color: var(--red);
    border-color: var(--red);
  }
}
.duedate-save-btn {
  padding: 6px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  &:hover {
    background: var(--accent-hover);
  }
}
/* Reminder popup */
.reminder-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  }
.reminder-add-row {
  display: flex;
  gap: 7px;
  }
.reminder-select {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  color: var(--text-0);
  padding: 7px 9px;
  font-family: inherit;
  font-size: 12px;
  outline: none;
  &:focus {
    border-color: var(--accent);
  }
}
.reminder-custom-row {
  display: flex;
  flex-direction: column;
  gap: 7px;
  }
.reminder-custom-label {
  font-size: 11px;
  color: var(--text-2);
  }
.reminder-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  }
.reminder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--bg-3);
  border-radius: 6px;
  padding: 7px 9px;
  color: var(--text-1);
  font-size: 12px;
  }
.reminder-remove-btn {
  border: none;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  padding: 1px 3px;
  &:hover {
    color: var(--red);
  }
}
.reminder-empty {
  color: var(--text-2);
  font-size: 12px;
  padding: 3px 0;
  }
.reminder-enable-btn {
  align-self: flex-start;
  background: transparent;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  padding: 0;
  &:hover {
    color: var(--accent-hover);
    text-decoration: underline;
  }
}
/* Markdown editor */
.md-area {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  overflow: hidden;
}
.md-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.md-pane + .md-pane {
  border-left: 1px solid var(--border);
  }
.md-pane-label {
  padding: 8px 20px;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.md-textarea {
  flex: 1;
  background: var(--bg-1);
  color: var(--text-0);
  border: none;
  padding: 18px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  resize: none;
  outline: none;
}
.md-preview {
  flex: 1;
  padding: 18px 22px;
  overflow-y: auto;
  background: var(--bg-1);
  color: var(--text-1);
  line-height: 1.75;
  font-size: 13.5px;
  h1, h2, h3 {
    color: var(--text-0);
    margin: 1em 0 0.4em;
  }
  code {
    font-family: 'JetBrains Mono', monospace;
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 12px; 
  }
  pre { background: var(--bg-2); padding: 6px; border-radius: 6px; overflow-x: auto; margin: 0.8em 0; }
  ul, ol { padding-left: 1.4em; margin: 0.4em 0; }
  pre code.hljs{
    padding:0;
    background: var(--bg-2);
  }
  a { color: var(--accent); }
  hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1em 0;
  }
  blockquote {
    background: var(--bg-2);
    border-left: 5px solid #ccc;
    margin: 1.5em 0;
    padding: 0.4em;
  }
}

/* ────── Modal ────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
  &.open {
    opacity: 1;
    pointer-events: all;
    .modal { transform: translateY(0); }
  }
}
.modal {
  background: var(--bg-2);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  width: min(480px, calc(100vw - 32px));
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
  transform: translateY(8px);
  transition: transform 0.15s;
}

.modal-header {
  padding: 20px 22px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-title {
  font-size: 16px;
  font-weight: 700;
  }
.modal-close-btn {
  width: 28px; height: 28px;
  border: none; background: transparent;
  color: var(--text-2); font-size: 18px;
  cursor: pointer; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
  &:hover {
    background: var(--bg-4);
    color: var(--text-0);
  }
}
.modal-body {
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  }

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  }
.form-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  }
.form-input, .form-select {
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  color: var(--text-0);
  padding: 9px 12px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
  &:focus {
    border-color: var(--accent);
  }
}
.form-input::placeholder {
  color: var(--text-2);
  }
.form-select option {
  background: var(--bg-3);
  }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  }

.modal-footer {
  padding: 14px 22px 20px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  border-top: 1px solid var(--border);
}
.btn {
  padding: 9px 18px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  transition: background var(--transition);
  }
.btn-ghost {
  background: transparent;
  color: var(--text-1);
  border: 1px solid var(--border-light);
  &:hover {
    background: var(--bg-3);
  }
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  &:hover {
    background: var(--accent-hover);
  }
  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}
.btn-danger {
  margin-right: auto;
  background: transparent;
  color: var(--red);
  border: 1px solid rgba(239,83,80,0.45);
  &:hover {
    background: var(--red);
    color: #fff;
  }
}
/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-0);
  z-index: 9999;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  transform: translateY(8px);
  opacity: 0;
  transition: all 0.2s;
  pointer-events: none;
  &.show {
    transform: translateY(0);
    opacity: 1;
  }
  &.success {
    border-left: 3px solid var(--green);
  }
  &.error   {
    border-left: 3px solid var(--red);
  }
}
/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
  }
::-webkit-scrollbar-track {
  background: transparent;
  }
::-webkit-scrollbar-thumb {
  background: var(--bg-4);
  border-radius: 3px;
  &:hover {
    background: var(--text-2);
  }
}
@media (max-width: 640px) {
  .md-area { grid-template-columns: 1fr; }
  .md-pane + .md-pane { display: none; }
  .form-row { grid-template-columns: 1fr; }
}