/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: 0.3s;
}

:root {
  --bg: #f0f4f8;
  --card: #ffffff;
  --text: #22223b;
  --accent: #5e60ce;
  --accent-hover: #3a0ca3;
  --border: #e0e1dd;
}
body.dark {
  --bg: #232946;
  --card: #1a1a2e;
  --text: #e0e1dd;
  --accent: #eebbc3;
  --accent-hover: #b8c1ec;
  --border: #393e46;
}

.app {
  max-width: 600px;
  margin: 2rem auto;
  padding: 1rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  font-size: 1.8rem;
}
#themeToggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.task-input {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0;
}
.task-input input, .task-input select {
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
}
.task-input button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: 0.2s;
}
.task-input button:hover {
  background: var(--accent-hover);
  opacity: 1;
}

.filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.filters button {
  flex: 1;
  border: none;
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  transition: 0.2s;
}
.filters .active {
  background: var(--accent);
  color: #fff;
}

#taskList {
  list-style: none;
}
.task {
  background: var(--card);
  padding: 0.8rem;
  margin-bottom: 0.5rem;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border);
}
.task.completed {
  text-decoration: line-through;
  opacity: 0.6;
}
.task .info {
  flex: 1;
}
.task small {
  font-size: 0.8rem;
  color: gray;
}
.task button {
  margin-left: 0.3rem;
  border: none;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}
.task button.complete { background: #81c784; color: #fff; }
.task button.delete { background: #e57373; color: #fff; }
.task button.edit { background: #64b5f6; color: #fff; }

@media (max-width: 600px) {
  html, body {
    overflow: hidden;
    height: 100%;
    /* Prevent scrolling */
  }
  .app {
    max-width: 100%;
    margin: 0;
    padding: 0.5rem;
  }
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  header h1 {
    font-size: 1.3rem;
  }
  .task-input {
    flex-direction: column;
    gap: 0.5rem;
  }
  .filters {
    flex-direction: column;
    gap: 0.5rem;
  }
  .task {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.6rem;
  }
  .task .info {
    width: 100%;
  }
  .task button {
    margin-left: 0;
    margin-right: 0.3rem;
  }
}