:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #bb86fc;
    --secondary-color: #03dac6;
    --error-color: #cf6679;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333333;
    --radius: 8px;
    --spacing: 16px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    padding-top: 50px;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 600px;
    padding: var(--spacing);
}

h1 {
    text-align: center;
    margin-bottom: var(--spacing);
    color: var(--primary-color);
}

/* Form Styles */
.todo-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.todo-input {
    flex-grow: 1;
    padding: 12px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    color: var(--text-primary);
    font-size: 16px;
}

.todo-input:focus {
    outline: 2px solid var(--primary-color);
    border-color: transparent;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #000;
}

/* List Styles */
.todo-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

todo-item {
    display: block;
}