/* Importing Google Fonts - Inter */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
}

:root {
  --bg: #f5f5f4;
  --column: #ebeae7;
  --card: #ffffff;
  --text: #1c1b19;
  --muted: #74716b;
  --border: #e0ded9;
  --accent: #6d5dfc;
  --danger: #e5484d;
  --shadow: 0 1px 2px rgba(28, 27, 25, 0.06), 0 1px 1px rgba(28, 27, 25, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111110;
    --column: #1b1b19;
    --card: #232321;
    --text: #eeeeec;
    --muted: #8f8d87;
    --border: #2e2e2b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 24px;
  gap: 20px;
}

.sub {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.board-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  font-size: 1.3rem;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
}

.title h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  height: 38px;
  border-radius: 10px;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
}

.search:focus-within {
  border-color: var(--accent);
}

.search input {
  width: 170px;
  border: none;
  outline: none;
  background: none;
  font-size: 0.9rem;
}

.label-filter {
  display: flex;
  gap: 6px;
}

.label-chip {
  padding: 6px 10px;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 14%, transparent);
  border: 1.5px solid transparent;
  transition:
    border-color 0.2s ease,
    opacity 0.2s ease;
}

.label-filter.filtering .label-chip:not(.on) {
  opacity: 0.45;
}

.label-chip.on {
  border-color: var(--c);
}

.btn-ghost,
.btn-primary,
.btn-danger {
  height: 38px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  transition:
    background 0.2s ease,
    transform 0.15s ease;
}

.btn-ghost {
  background: var(--card);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--column);
}

.btn-primary {
  color: #fff;
  background: var(--accent);
}

.btn-primary:hover {
  background: #5a49f0;
}

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

.btn-danger:hover {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

/* ---------- Board ---------- */
.board {
  flex: 1;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 1fr);
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}

.column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  max-height: calc(100vh - 140px);
  padding: 12px;
  border-radius: 16px;
  background: var(--column);
  scroll-snap-align: start;
  transition:
    background 0.2s ease,
    box-shadow 0.2s ease;
}

.column.drop-target {
  box-shadow: inset 0 0 0 2px var(--accent);
}

.column.over-limit .col-count {
  color: #fff;
  background: var(--danger);
}

.col-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 4px 12px;
}

.col-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 25%, transparent);
}

.col-head h2 {
  font-size: 0.92rem;
  font-weight: 600;
}

.col-count {
  padding: 1px 8px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--card);
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.col-limit {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--muted);
}

.cards {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 60px;
  overflow-y: auto;
  padding: 2px;
  margin: -2px;
}

/* ---------- Card ---------- */
.card {
  position: relative;
  padding: 14px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    opacity 0.2s ease;
  animation: pop 0.3s ease;
}

@keyframes pop {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
}

.card:hover {
  box-shadow: 0 6px 16px rgba(28, 27, 25, 0.08);
}

.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.card.hidden {
  display: none;
}

/* The original card stays in place as a faded "ghost" while dragging */
.card.dragging-source {
  opacity: 0.35;
}

/* Floating copy that follows the pointer */
.card.drag-clone {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  cursor: grabbing;
  animation: none;
  transform: rotate(3deg) scale(1.03);
  box-shadow: 0 20px 40px rgba(28, 27, 25, 0.25);
}

.placeholder {
  flex-shrink: 0;
  border-radius: 12px;
  border: 2px dashed color-mix(in srgb, var(--accent) 60%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.tag {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 14%, transparent);
}

.priority {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
}

.priority i {
  width: 3px;
  border-radius: 2px;
  background: var(--border);
}

.priority i:nth-child(1) {
  height: 5px;
}

.priority i:nth-child(2) {
  height: 8px;
}

.priority i:nth-child(3) {
  height: 12px;
}

.priority.low i:nth-child(1),
.priority.medium i:nth-child(-n + 2) {
  background: #f5a524;
}

.priority.high i {
  background: var(--danger);
}

.card h3 {
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.4;
}

.card p {
  margin-top: 4px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.due {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--muted);
}

.due.overdue {
  color: var(--danger);
  font-weight: 600;
}

.avatar {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 700;
  color: #fff;
  background: hsl(var(--h) 60% 55%);
}

/* ---------- Add card ---------- */
.add-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.add-btn:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--card) 70%, transparent);
}

.add-form {
  display: none;
  margin-top: 10px;
}

.column.adding .add-form {
  display: block;
}

.column.adding .add-btn {
  display: none;
}

.add-form textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1.5px solid var(--accent);
  background: var(--card);
  font-size: 0.9rem;
  resize: none;
  outline: none;
}

.add-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.add-actions .btn-primary,
.add-actions .btn-ghost {
  height: 34px;
}

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(10, 10, 9, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.2s ease,
    visibility 0.2s;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 520px;
  padding: 22px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
  transform: translateY(12px) scale(0.98);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.modal-backdrop.open .modal {
  transform: none;
}

.modal header,
.modal footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal header {
  margin-bottom: 16px;
}

.modal h2 {
  font-size: 1.1rem;
}

.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: var(--muted);
}

.icon-btn:hover {
  background: var(--column);
}

.m-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}

.m-field input,
.m-field textarea,
.m-field select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  background: var(--bg);
  font-size: 0.93rem;
  font-weight: 400;
  color: var(--text);
  outline: none;
  resize: vertical;
}

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

.m-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.modal footer {
  margin-top: 6px;
}

.modal footer > div {
  display: flex;
  gap: 8px;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 3000;
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 0.88rem;
  font-weight: 500;
  color: #fff;
  background: #1c1b19;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transform: translate(-50%, 100px);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.toast.show {
  transform: translate(-50%, 0);
}

.toast button {
  margin-left: 12px;
  font-weight: 700;
  color: #a78bfa;
}

/* ---------- Responsive ---------- */
@media (max-width: 700px) {
  .app {
    padding: 16px 12px;
  }

  .tools,
  .search {
    width: 100%;
  }

  .search input {
    width: 100%;
  }

  .board {
    grid-auto-columns: 85%;
  }

  .column {
    max-height: none;
  }

  .m-row {
    grid-template-columns: 1fr 1fr;
  }
}

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