/* ── Kanban Board - style.css ── */

/* ========== CSS Variables / Theming ========== */
:root {
  --bg-gradient-1: #667eea;
  --bg-gradient-2: #764ba2;
  --column-bg: rgba(255, 255, 255, 0.12);
  --column-border: rgba(255, 255, 255, 0.18);
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --card-shadow-hover: rgba(0, 0, 0, 0.18);
  --card-title-color: #1a1a2e;
  --card-desc-color: #555;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.75);
  --accent: #4ecdc4;
  --accent-hover: #45b7aa;
  --danger: #e74c3c;
  --btn-bg: rgba(255, 255, 255, 0.18);
  --btn-bg-hover: rgba(255, 255, 255, 0.28);
  --input-bg: #ffffff;
  --input-border: #ddd;
  --input-text: #333;
  --form-bg: #ffffff;
  --footer-text: rgba(255, 255, 255, 0.55);
  --footer-link: rgba(255, 255, 255, 0.8);
  --drop-highlight: rgba(78, 205, 196, 0.2);
  --card-delete-color: #ccc;
  --tag-yellow-text: #333;
  --modal-overlay: rgba(0, 0, 0, 0.5);
  --modal-bg: #ffffff;
  --modal-text: #333;
  --modal-border: #eee;
  --kbd-bg: #f4f4f4;
  --kbd-border: #ccc;
  --kbd-text: #333;
}

[data-theme="dark"] {
  --bg-gradient-1: #0f0c29;
  --bg-gradient-2: #302b63;
  --column-bg: rgba(255, 255, 255, 0.06);
  --column-border: rgba(255, 255, 255, 0.1);
  --card-bg: #1e1e2e;
  --card-shadow: rgba(0, 0, 0, 0.3);
  --card-shadow-hover: rgba(0, 0, 0, 0.45);
  --card-title-color: #e0e0e0;
  --card-desc-color: #999;
  --text-primary: #e0e0e0;
  --text-secondary: rgba(255, 255, 255, 0.5);
  --accent: #4ecdc4;
  --accent-hover: #45b7aa;
  --danger: #e74c3c;
  --btn-bg: rgba(255, 255, 255, 0.08);
  --btn-bg-hover: rgba(255, 255, 255, 0.15);
  --input-bg: #2a2a3e;
  --input-border: #3a3a4e;
  --input-text: #ccc;
  --form-bg: #1e1e2e;
  --footer-text: rgba(255, 255, 255, 0.35);
  --footer-link: rgba(255, 255, 255, 0.6);
  --drop-highlight: rgba(78, 205, 196, 0.15);
  --card-delete-color: #555;
  --tag-yellow-text: #333;
  --modal-overlay: rgba(0, 0, 0, 0.7);
  --modal-bg: #1e1e2e;
  --modal-text: #ccc;
  --modal-border: #333;
  --kbd-bg: #2a2a3e;
  --kbd-border: #444;
  --kbd-text: #ccc;
}

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
}

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
  outline: none;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.4s ease;
}

/* ========== Header ========== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  color: var(--text-primary);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-left h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.header-btn {
  padding: 0.5rem 1rem;
  background: var(--btn-bg);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
}

.header-btn:hover {
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
}

.header-btn:active {
  transform: translateY(0);
}

.theme-toggle {
  width: 38px;
  height: 38px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  border-radius: 50%;
}

/* ========== Board ========== */
.board {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 0.5rem 1.5rem 1.5rem;
  flex: 1;
  align-items: flex-start;
  -webkit-overflow-scrolling: touch;
}

.board::-webkit-scrollbar {
  height: 8px;
}

.board::-webkit-scrollbar-track {
  background: transparent;
}

.board::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

/* ========== Column ========== */
.column {
  min-width: 300px;
  max-width: 300px;
  background: var(--column-bg);
  border: 1px solid var(--column-border);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.15);
}

.column-title {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.column-count {
  background: var(--btn-bg);
  color: var(--text-primary);
  padding: 0.15rem 0.55rem;
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

.column-menu {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.15rem;
  transition: color 0.2s, transform 0.15s;
  flex-shrink: 0;
}

.column-menu:hover {
  color: var(--danger);
  transform: scale(1.15);
}

/* ========== Cards Area ========== */
.cards {
  flex: 1;
  overflow-y: auto;
  min-height: 60px;
  border-radius: 8px;
  transition: background 0.2s;
  padding: 2px;
}

.cards::-webkit-scrollbar {
  width: 4px;
}

.cards::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
}

/* ========== Card ========== */
.card {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.65rem;
  cursor: grab;
  box-shadow: 0 2px 8px var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  user-select: none;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--card-shadow-hover);
}

.card.dragging {
  opacity: 0.4;
  cursor: grabbing;
  transform: rotate(2deg);
}

.card-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--card-title-color);
  line-height: 1.35;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--card-desc-color);
  margin-bottom: 0.5rem;
  line-height: 1.45;
}

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

.card-tags {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.tag {
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag.red { background: #e74c3c; }
.tag.blue { background: #3498db; }
.tag.green { background: #2ecc71; }
.tag.yellow { background: #f1c40f; color: var(--tag-yellow-text); }
.tag.purple { background: #9b59b6; }

.card-delete {
  background: none;
  border: none;
  color: var(--card-delete-color);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.2rem;
  transition: color 0.2s, transform 0.15s;
  line-height: 1;
}

.card-delete:hover {
  color: var(--danger);
  transform: scale(1.2);
}

/* ========== Add Card Button ========== */
.add-card {
  padding: 0.7rem 0.85rem;
  background: var(--btn-bg);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  text-align: left;
  margin-top: 0.75rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.add-card:hover {
  background: var(--btn-bg-hover);
  color: var(--text-primary);
}

/* ========== Card Form ========== */
.card-form {
  background: var(--form-bg);
  border-radius: 8px;
  padding: 0.85rem;
  margin-bottom: 0.65rem;
  box-shadow: 0 2px 8px var(--card-shadow);
}

.card-form input,
.card-form textarea {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-family: inherit;
  font-size: 0.85rem;
  background: var(--input-bg);
  color: var(--input-text);
  transition: border-color 0.2s;
}

.card-form input:focus,
.card-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.15);
}

.card-form textarea {
  resize: vertical;
  min-height: 55px;
}

.tag-selector {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.tag-option {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.2s, transform 0.15s;
}

.tag-option:hover {
  transform: scale(1.15);
}

.tag-option.selected {
  border-color: var(--text-primary);
  transform: scale(1.1);
}

.form-actions {
  display: flex;
  gap: 0.5rem;
}

.form-btn {
  padding: 0.45rem 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.15s;
}

.form-btn:hover {
  transform: translateY(-1px);
}

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

.form-btn.save:hover {
  background: var(--accent-hover);
}

.form-btn.cancel {
  background: var(--input-border);
  color: var(--input-text);
}

/* ========== Modal ========== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--modal-bg);
  border-radius: 12px;
  padding: 1.75rem;
  max-width: 460px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  color: var(--modal-text);
}

.modal h2 {
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.modal-close {
  float: right;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--modal-text);
  opacity: 0.5;
  transition: opacity 0.2s;
  line-height: 1;
}

.modal-close:hover {
  opacity: 1;
}

.shortcut-list {
  list-style: none;
}

.shortcut-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--modal-border);
  font-size: 0.88rem;
}

.shortcut-list li:last-child {
  border-bottom: none;
}

kbd {
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--kbd-text);
  min-width: 28px;
  text-align: center;
}

/* ========== Toast Notification ========== */
.toast {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--card-bg);
  color: var(--card-title-color);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  font-size: 0.88rem;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 2000;
  pointer-events: none;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== Footer ========== */
footer {
  text-align: center;
  padding: 1rem 1.5rem;
  color: var(--footer-text);
  font-size: 0.78rem;
}

footer a {
  color: var(--footer-link);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

footer a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

/* ========== Mobile Responsive ========== */
@media (max-width: 768px) {
  header {
    padding: 0.75rem 1rem;
  }

  .header-left h1 {
    font-size: 1.15rem;
  }

  .header-btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.78rem;
    min-height: 44px;
  }

  .add-card { min-height: 44px; }
  .form-btn { min-height: 44px; }
  .card-form input, .card-form textarea { min-height: 44px; }
  .tag-option { min-width: 32px; min-height: 32px; }
  .column-menu { min-height: 44px; min-width: 44px; }
  .card { min-height: 48px; }

  .board {
    padding: 0.25rem 0.75rem 1rem;
    gap: 0.75rem;
  }

  .column {
    min-width: 260px;
    max-width: 260px;
    padding: 0.75rem;
  }
}

@media (max-width: 480px) {
  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .column {
    min-width: 85vw;
    max-width: 85vw;
  }

  .board {
    scroll-snap-type: x mandatory;
  }

  .column {
    scroll-snap-align: center;
  }

  .modal {
    padding: 1.25rem;
    margin: 0.5rem;
  }

  footer { padding: 0.75rem 1rem; font-size: 0.72rem; }
}

/* ── 375px breakpoint (small phones) ── */
@media (max-width: 375px) {
  header { padding: 0.5rem 0.75rem; }
  .header-left h1 { font-size: 1.05rem; }
  .header-btn { padding: 0.35rem 0.55rem; font-size: 0.72rem; }
  .column { padding: 0.6rem; }
}

/* ========== Touch Drag Clone ========== */
.drag-clone {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.85;
  transform: rotate(3deg) scale(1.04);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  transition: box-shadow 0.2s;
}

/* ========== Drop Zone Highlight ========== */
.column.drag-over {
  border: 2px dashed var(--accent);
  background: rgba(78, 205, 196, 0.05);
  transition: all 0.2s;
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }