:root {
  --bg: #f3f3f3;
  --panel-bg: #ededed;
  --line: #1f1f1f;
  --text: #111111;
  --muted: #666666;
  --surface: #f8f8f8;
  --accent: #183153;
  --accent-soft: #dce7f5;
  --radius-lg: 28px;
  --radius-md: 22px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", sans-serif;
  color: var(--text);
  background: var(--bg);
}

button,
input {
  font: inherit;
}

.app-shell {
  max-width: 1400px;
  margin: 0 auto;
  height: 100vh;
  padding: 16px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 10px;
  overflow: hidden;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(18px, 1.7vw, 26px);
  font-weight: 700;
}

.layout-grid {
  display: grid;
  grid-template-columns: 2fr 0.9fr;
  gap: 14px;
  min-height: 0;
}

.panel {
  border: 4px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel-bg);
  min-height: 0;
}

.panel h2 {
  margin: 0;
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 700;
  text-align: center;
}

.panel-heading {
  display: grid;
  gap: 6px;
}

.matrix-panel {
  padding: 18px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  min-height: 0;
}

.quadrants {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 16px;
  min-height: 0;
}

.quadrant {
  min-height: 0;
  height: 100%;
  border: 2px dashed #696969;
  border-radius: 14px;
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr);
  text-align: center;
  gap: 8px;
  padding: 10px;
  overflow: hidden;
  background: #f6f6f6;
}

.quadrant h3,
.quadrant p {
  margin: 0;
}

.quadrant h3 {
  font-size: clamp(14px, 1.4vw, 18px);
}

.quadrant p {
  font-size: clamp(12px, 1.2vw, 14px);
  color: #444;
}

.right-column {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 12px;
  min-height: 0;
}

.list-priority-panel {
  padding: 14px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 10px;
  min-height: 0;
}

.input-panel {
  padding: 12px;
  border-radius: var(--radius-md);
  display: grid;
  gap: 8px;
}

.list-priority-grid {
  display: grid;
  gap: 8px;
  min-height: 0;
  height: 100%;
}

.sub-panel {
  border: 2px dashed #8a8a8a;
  border-radius: 12px;
  padding: 10px;
  background: #f6f6f6;
  height: 100%;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  min-height: 0;
}

.sub-panel h3 {
  margin: 0 0 8px;
  font-size: clamp(14px, 1.3vw, 17px);
}

.task-list,
.quadrant-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  align-content: start;
  min-height: 0;
  overflow: auto;
}

.quadrant-list {
  grid-row: 4;
}

#task-list {
  grid-row: 3;
}

.task-card,
.quadrant-task {
  border: 2px solid #8a8a8a;
  border-radius: 12px;
  background: var(--surface);
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.task-card.is-completed,
.quadrant-task.is-completed {
  background: #c8c8c8;
  border-color: #666666;
}

.task-card-meta {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.task-card-title,
.quadrant-task-title {
  font-size: 14px;
  font-weight: 700;
}

.task-card-description {
  font-size: 12px;
  color: var(--muted);
}

.task-card.is-completed .task-card-title,
.quadrant-task.is-completed .quadrant-task-title {
  color: #353535;
  text-decoration: line-through;
}

.task-card.is-completed .task-card-description {
  color: #4f4f4f;
}

.task-actions {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.task-button,
.input-skeleton button {
  border: 2px solid var(--line);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
  padding: 3px 5px;
  font-size: 12px;
  font-weight: 700;
}

.task-button:not(:disabled),
.input-skeleton button:not(:disabled) {
  cursor: pointer;
}

.task-button.is-disabled {
  border-color: #a4a4a4;
  color: #8b8b8b;
  background: #efefef;
}

.empty-state {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  align-self: start;
}

.quadrant > .empty-state {
  grid-row: 3;
}

#task-list-empty {
  grid-row: 2;
}

.input-skeleton {
  display: grid;
  gap: 8px;
}

.check-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.input-skeleton .check-option {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  font-size: clamp(12px, 1vw, 14px);
  font-weight: 700;
  white-space: nowrap;
  grid-auto-flow: column;
  width: fit-content;
}

.input-skeleton .check-option input {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin: 0;
}

.input-skeleton label {
  display: grid;
  gap: 4px;
  font-size: clamp(12px, 1vw, 14px);
  font-weight: 700;
}

.input-skeleton input {
  width: 100%;
  border: 2px solid #8a8a8a;
  border-radius: 10px;
  background: #f9f9f9;
  color: #1f1f1f;
  padding: 8px 10px;
  font-size: 13px;
}

.form-mode-indicator {
  margin: 0;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.form-mode-indicator[data-mode="edit"] {
  padding: 6px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
}

.form-error {
  min-height: 18px;
  margin: 0;
  color: #b11818;
  font-size: 12px;
  font-weight: 700;
}

.form-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.secondary-button {
  background: #f0f0f0;
}

@media (max-width: 1024px) {
  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .layout-grid {
    grid-template-columns: 1fr;
  }

  .right-column {
    grid-template-rows: auto auto;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 16px;
  }

  .panel h2 {
    font-size: 28px;
  }

  .sub-panel h3 {
    font-size: 17px;
  }

  .quadrants {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, minmax(180px, auto));
  }

  .check-row,
  .form-actions {
    grid-template-columns: 1fr;
  }

  .task-card,
  .quadrant-task {
    flex-direction: column;
    align-items: stretch;
  }

  .task-actions {
    width: 100%;
  }

  .task-actions .task-button {
    flex: 1 1 auto;
  }
}