@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

:root {
    --bg-color-light: #f3e5f5;
    --bg-color-dark: #121212;
    --app-bg-light: #ffffff;
    --app-bg-dark: #1e1e1e;
    --primary-color-light: #6a1b9a;
    --primary-color-dark: #bb86fc;
    --secondary-color-light: #8e24aa;
    --secondary-color-dark: #9e6cfc;
    --text-color-light: #333;
    --text-color-dark: #e0e0e0;
    --input-border-light: #d1c4e9;
    --input-border-dark: #3a3a3a;
    --li-bg-light: #fafafa;
    --li-bg-dark: #2a2a2a;
    --li-border-light: #ab47bc;
    --li-border-dark: #6200ee;
    --completed-bg-light: #f5f5f5;
    --completed-bg-dark: #222222;
    --completed-text-light: #9e9e9e;
    --completed-text-dark: #757575;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color-light); 
    color: var(--text-color-light);
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

.app-container {
    max-width: 600px;
    margin: 40px auto;
    background-color: var(--app-bg-light);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, box-shadow 0.3s;
}

body.dark-mode .app-container {
    background-color: var(--app-bg-dark);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

h1 {
    text-align: center;
    color: var(--primary-color-light); 
    margin: 0;
}

body.dark-mode h1 {
    color: var(--primary-color-dark);
}

h2 {
    color: var(--secondary-color-light);
    border-bottom: 2px solid #e1bee7;
    padding-bottom: 8px;
    margin-top: 30px;
}

body.dark-mode h2 {
    color: var(--secondary-color-dark);
    border-bottom-color: #4a4a4a;
}

#dark-mode-toggle {
    padding: 8px 12px;
    border: none;
    background-color: var(--primary-color-light);
    color: white;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

body.dark-mode #dark-mode-toggle {
    background-color: var(--primary-color-dark);
    color: #121212;
}

#add-task-area {
    display: flex;
    gap: 10px;
}

#task-input-box {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--input-border-light);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
    background-color: var(--app-bg-light);
    color: var(--text-color-light);
}

body.dark-mode #task-input-box {
    border-color: var(--input-border-dark);
    background-color: var(--app-bg-dark);
    color: var(--text-color-dark);
}

#task-input-box:focus {
    outline: none;
    border-color: var(--secondary-color-light); 
    box-shadow: 0 0 8px rgba(142, 36, 170, 0.2); 
}

body.dark-mode #task-input-box:focus {
    border-color: var(--secondary-color-dark);
    box-shadow: 0 0 8px rgba(158, 108, 252, 0.4);
}

#add-task-button {
    padding: 12px 20px;
    border: none;
    background-color: var(--secondary-color-light); 
    color: white;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

#add-task-button:hover {
    background-color: #6a1b9a; 
    transform: translateY(-2px);
}

body.dark-mode #add-task-button {
    background-color: var(--secondary-color-dark);
    color: #121212;
}

body.dark-mode #add-task-button:hover {
    background-color: #7c4dff;
}

ul {
    list-style-type: none;
    padding: 0;
    margin-top: 20px;
}

li {
    padding: 15px;
    background-color: var(--li-bg-light);
    margin-top: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 5px solid var(--li-border-light);
    border-radius: 8px;
    transition: box-shadow 0.3s, background-color 0.3s, border-left-color 0.3s;
}

body.dark-mode li {
    background-color: var(--li-bg-dark);
    border-left-color: var(--li-border-dark);
}

li:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

body.dark-mode li:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

li.completed {
    background-color: var(--completed-bg-light);
    border-left: 5px solid #bdbdbd;
}

body.dark-mode li.completed {
    background-color: var(--completed-bg-dark);
    border-left-color: #616161;
}

li.completed span {
    text-decoration: line-through;
    color: var(--completed-text-light);
}

body.dark-mode li.completed span {
    color: var(--completed-text-dark);
}

.task-buttons button {
    margin-left: 8px;
    cursor: pointer;
    border: 1px solid var(--input-border-light);
    background-color: transparent;
    color: var(--secondary-color-light);
    padding: 6px 10px;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode .task-buttons button {
    border-color: var(--input-border-dark);
    color: var(--secondary-color-dark);
}

.task-buttons button:hover {
    background-color: var(--secondary-color-light);
    color: white;
}

body.dark-mode .task-buttons button:hover {
    background-color: var(--secondary-color-dark);
    color: #121212;
}