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

:root {
  --gray-950: #030712;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --violet-600: #7c3aed;
  --violet-500: #8b5cf6;
  --violet-400: #a78bfa;
  --indigo-400: #818cf8;
  --amber-500: #f59e0b;
  --amber-400: #fbbf24;
  --emerald-500: #10b981;
  --emerald-400: #34d399;
  --red-400: #f87171;
  --sky-400: #38bdf8;
  --pink-400: #f472b6;
  --teal-400: #2dd4bf;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-950);
  color: var(--gray-100);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== Welcome Page ===== */
.welcome-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.welcome-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
}

.welcome-glow {
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(139, 92, 246, 0.1), transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.welcome-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  padding: 2rem;
}

.welcome-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.25);
  color: var(--violet-400);
  margin-bottom: 1.5rem;
}

.welcome-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.2;
  color: white;
}

.gradient-text {
  background: linear-gradient(135deg, var(--violet-400), var(--indigo-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-subtitle {
  color: var(--gray-400);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

/* Auth Buttons */
.auth-buttons {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  margin-bottom: 3rem;
  justify-content: center;
}

.auth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.85rem 2rem;
  border-radius: 12px;
  border: 1px solid var(--gray-700);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 220px;
}

.auth-btn-github {
  background: white;
  color: #1f2937;
  border-color: rgba(255, 255, 255, 0.2);
}
.auth-btn-github:hover {
  background: #f3f4f6;
}
.auth-btn-github svg {
  color: #1f2937;
  fill: #1f2937;
}

.auth-btn-google {
  background: var(--gray-800);
  color: white;
  border-color: var(--gray-600);
}
.auth-btn-google:hover {
  background: var(--gray-700);
  border-color: var(--gray-500);
}

.auth-error {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

/* Feature Cards */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.feature-card {
  background: rgba(31, 41, 55, 0.4);
  border: 1px solid var(--gray-700);
  border-radius: 16px;
  padding: 1.5rem;
  text-align: left;
}

.feature-card h3 {
  color: var(--gray-100);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.feature-card p {
  color: var(--gray-500);
  font-size: 0.85rem;
  line-height: 1.5;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  margin-bottom: 0.85rem;
}

/* Powered By */
.powered-by {
  color: var(--gray-600);
  font-size: 0.8rem;
  margin-top: 2.5rem;
}

.powered-by a {
  color: inherit;
  text-decoration: none;
}

.powered-by a:hover {
  text-decoration: underline;
}

.powered-by strong {
  color: var(--gray-500);
  font-weight: 500;
}

.board-footer {
  text-align: center;
  padding: 1rem 0;
  margin-top: auto;
}

.feature-icon-violet {
  background: rgba(139, 92, 246, 0.15);
  color: var(--violet-400);
}
.feature-icon-indigo {
  background: rgba(99, 102, 241, 0.15);
  color: var(--indigo-400);
}
.feature-icon-sky {
  background: rgba(56, 189, 248, 0.15);
  color: var(--sky-400);
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--gray-900);
  border-bottom: 1px solid var(--gray-700);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.header-icon {
  color: var(--violet-400);
}

.header-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
}

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

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--violet-500);
  object-fit: cover;
}

.user-email {
  color: var(--gray-400);
  font-size: 0.85rem;
}

.btn-signout {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: 1px solid var(--gray-700);
  color: var(--gray-400);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-signout:hover {
  color: white;
  border-color: var(--gray-600);
}

/* Share & Join Buttons */
.btn-share {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: 1px solid var(--gray-700);
  color: var(--gray-400);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-share:hover {
  color: white;
  border-color: var(--violet-500);
  background: rgba(139, 92, 246, 0.1);
}

/* Collab Badge */
.collab-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald-400);
  padding: 0.3rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.collab-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--emerald-400);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Share Modal */
.share-modal {
  max-width: 420px;
}

.share-desc {
  color: var(--gray-400);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.room-code {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.4rem;
  color: white;
  text-align: center;
  padding: 0.5rem 0;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.qr-container {
  display: flex;
  justify-content: center;
  padding: 1rem 0;
}

.qr-container canvas,
.qr-container img {
  border-radius: 8px;
}

.copy-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.copy-row input {
  flex: 1;
  padding: 0.55rem 0.75rem;
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: 8px;
  color: var(--gray-300);
  font-size: 0.8rem;
  font-family: inherit;
  outline: none;
}

.btn-copy {
  padding: 0.55rem 1rem !important;
  white-space: nowrap;
}

.collab-info {
  text-align: center;
  color: var(--emerald-400);
  font-size: 0.8rem;
  margin-top: 0.75rem;
}

/* ===== Board ===== */
.board-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.board {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  flex: 1;
  overflow-x: auto;
}

/* ===== Column ===== */
.column {
  min-width: 280px;
  max-width: 320px;
  flex: 1;
  background: rgba(17, 24, 39, 0.5);
  border-radius: 12px;
  border: 1px solid var(--gray-800);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 80px);
}

.column[data-column="todo"] {
  border-top: 4px solid var(--violet-500);
}
.column[data-column="inprogress"] {
  border-top: 4px solid var(--amber-500);
}
.column[data-column="completed"] {
  border-top: 4px solid var(--emerald-500);
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1rem 0.75rem;
}

.column-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.column-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-300);
}

.column-count {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
}

.count-violet {
  background: rgba(139, 92, 246, 0.15);
  color: var(--violet-400);
}
.count-amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber-400);
}
.count-emerald {
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald-400);
}

.btn-add {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1px solid var(--gray-700);
  border-radius: 6px;
  color: var(--gray-400);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-add:hover {
  color: white;
  border-color: var(--gray-600);
  background: var(--gray-800);
}

/* Task List */
.task-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0.75rem 0.75rem;
  min-height: 60px;
  transition: background 0.2s;
}

.task-list.drag-over {
  background: rgba(31, 41, 55, 0.5);
  border-radius: 8px;
}

.task-list-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  font-size: 0.8rem;
  padding: 2rem 0;
}

/* ===== Task Card ===== */
.task-card {
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: 10px;
  padding: 0.85rem;
  margin-bottom: 0.5rem;
  cursor: grab;
  transition: border-color 0.2s, box-shadow 0.2s;
  position: relative;
}

.task-card:hover {
  border-color: var(--gray-600);
}

.task-card.dragging {
  opacity: 0.5;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.task-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.task-grip {
  color: var(--gray-600);
  flex-shrink: 0;
  margin-top: 2px;
}

.task-card-actions {
  display: flex;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.2s;
  flex-shrink: 0;
}

.task-card:hover .task-card-actions {
  opacity: 1;
}

.task-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: transparent;
  border: none;
  border-radius: 5px;
  color: var(--gray-500);
  cursor: pointer;
  transition: all 0.15s;
}
.task-action-btn:hover {
  background: var(--gray-700);
  color: var(--gray-300);
}
.task-action-btn.delete:hover {
  color: var(--red-400);
}

.task-card-body {
  flex: 1;
  min-width: 0;
}

.task-card-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--gray-100);
  margin-bottom: 0.25rem;
  word-break: break-word;
}

.task-card-desc {
  font-size: 0.78rem;
  color: var(--gray-500);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.task-card-footer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

/* Priority Badge */
.priority-badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  text-transform: capitalize;
}

.priority-low {
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald-400);
}
.priority-medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber-400);
}
.priority-high {
  background: rgba(239, 68, 68, 0.15);
  color: var(--red-400);
}

/* Tag Badge */
.tag-badge {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
}

.tag-violet {
  background: rgba(139, 92, 246, 0.15);
  color: var(--violet-400);
}
.tag-sky {
  background: rgba(56, 189, 248, 0.15);
  color: var(--sky-400);
}
.tag-pink {
  background: rgba(244, 114, 182, 0.15);
  color: var(--pink-400);
}
.tag-indigo {
  background: rgba(99, 102, 241, 0.15);
  color: var(--indigo-400);
}
.tag-teal {
  background: rgba(45, 212, 191, 0.15);
  color: var(--teal-400);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: 16px;
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.modal-heading {
  font-size: 1.15rem;
  font-weight: 600;
  color: white;
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gray-400);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--gray-800);
  border: 1px solid var(--gray-700);
  border-radius: 8px;
  color: white;
  font-size: 0.88rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--violet-500);
  box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-600);
}

.form-group select option {
  background: var(--gray-800);
  color: white;
}

.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.btn-cancel {
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--gray-700);
  background: transparent;
  color: var(--gray-400);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-cancel:hover {
  color: white;
  border-color: var(--gray-600);
}

.btn-submit {
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: none;
  background: var(--violet-600);
  color: white;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-submit:hover {
  background: var(--violet-500);
}

/* ===== Scrollbar ===== */
.task-list::-webkit-scrollbar {
  width: 4px;
}
.task-list::-webkit-scrollbar-track {
  background: transparent;
}
.task-list::-webkit-scrollbar-thumb {
  background: var(--gray-700);
  border-radius: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .welcome-title {
    font-size: 2.2rem;
  }
  .auth-buttons {
    flex-direction: column;
  }
  .auth-btn {
    min-width: unset;
  }
  .feature-cards {
    grid-template-columns: 1fr;
  }
  .board {
    padding: 1rem;
  }
  .column {
    min-width: 260px;
  }
  .header-right .user-email {
    display: none;
  }
}