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

html, body {
  width: 100%;
  height: 100%;
}

:root {
  --bg-main: #0f1115;
  --bg-surface: #161a22;
  --bg-column: #1c2230;
  --bg-task: #232a3b;
  --bg-button: #2d3550;
  --bg-danger: #e5484d;

  --text-primary: #f5f7fa;
  --text-secondary: #b5b9c6;

  --accent: #4f7cff;

  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 15px 45px rgba(0, 0, 0, 0.45);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

main {
  height: 100%;
  display: flex;
  flex-direction: column;
}

nav {
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(
    to right,
    rgba(79, 124, 255, 0.1),
    transparent
  );
}

nav .left {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

nav button {
  background-color: var(--bg-button);
  border: none;
  color: var(--text-primary);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition-fast),
    background-color var(--transition-fast), box-shadow var(--transition-fast);
}

nav button:hover {
  background-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

section {
  padding: 1.5rem 2rem;
  display: flex;
  flex-grow: 1;
  gap: 2rem;
}

.task-column {
  background-color: var(--bg-column);
  flex: 1;
  padding: 1rem;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-smooth),
    box-shadow var(--transition-smooth);
}

.task-column.hover-over {
  transform: scale(1.04);
  box-shadow: var(--shadow-hover);
  outline: 2px dashed var(--accent);
}

.task-column .heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.task {
  background-color: var(--bg-task);
  padding: 0.9rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: grab;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.task:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
}

.task h2 {
  font-size: 1rem;
  font-weight: 600;
}

.task p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.task button {
  align-self: flex-end;
  background-color: var(--bg-danger);
  border: none;
  color: var(--text-primary);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.75rem;
  transition: transform var(--transition-fast),
    opacity var(--transition-fast);
}

.task button:hover {
  transform: scale(1.08);
  opacity: 0.9;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.modal .bg {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
}

.modal .center {
  background-color: var(--bg-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  z-index: 1;
  animation: scaleUp 0.3s ease;
  box-shadow: var(--shadow-hover);
}

.modal input,
.modal textarea {
  background-color: var(--bg-task);
  border: none;
  color: var(--text-primary);
  padding: 0.7rem;
  border-radius: var(--radius-sm);
}

.modal button {
  margin-top: 0.5rem;
  background-color: var(--accent);
  border: none;
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  align-self: center;
  transition: transform var(--transition-fast);
}

.modal button:hover {
  transform: translateY(-2px);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes scaleUp {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}