:root {
  --bg-dark: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --border: rgba(255, 255, 255, 0.1);
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --danger: #ef4444;
}

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

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Premium Background Effect */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(
      circle at top right,
      rgba(99, 102, 241, 0.15),
      transparent 40%
    ),
    radial-gradient(
      circle at bottom left,
      rgba(236, 72, 153, 0.1),
      transparent 40%
    );
  z-index: -1;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-input-group {
  display: flex;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.25rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.ai-input-group input {
  background: transparent;
  border: none;
  color: white;
  padding: 0.5rem 1rem;
  width: 350px;
  outline: none;
}

.ai-input-group button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 600;
  transition: 0.2s;
}

.ai-input-group button:hover {
  background: var(--primary-hover);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.board {
  display: flex;
  flex: 1;
  padding: 2rem;
  gap: 1.5rem;
  overflow-x: auto;
}

.column {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  min-width: 320px;
  flex: 1;
}

.column-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.column-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.add-task-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  transition: 0.2s;
}

.add-task-btn:hover {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.task-list {
  padding: 1rem;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 150px;
}

/* Drag Over Highlight */
.task-list.drag-over {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  box-shadow: inset 0 0 10px rgba(99, 102, 241, 0.2);
}

.task-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  cursor: grab;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  position: relative;
}

.task-card:active {
  cursor: grabbing;
}

.task-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.2);
}

.task-card.dragging {
  opacity: 0.4;
  border: 1px dashed var(--primary);
  transform: scale(0.98);
}

.task-content {
  font-size: 0.95rem;
  line-height: 1.4;
  word-break: break-word;
  padding-right: 1.5rem; /* Space for delete btn */
}

.delete-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: 0.2s;
}

.task-card:hover .delete-btn {
  opacity: 1;
}

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

/* Auth Overlay Styles */
.auth-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.auth-card h2 {
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.auth-card p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.google-login-btn {
  background: white;
  color: #333;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: 0.2s;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.google-login-btn:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}