/* Reset */

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

body{
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: #f4f6fb;
    color: #1f2937;
    display: flex;
    min-height: 100vh;
}

/* Sidebar */

.sidebar{
    width: 240px;
    background: #ffffff;
    padding: 30px 20px;
    border-right: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.logo{
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #4f46e5;
}

.dark-btn{
    display: block;
    width: 100%;padding: 10px 0;
    margin: 15px 0;
    background-color: #00d4ff;
    color: #fff;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

.dark-btn:hover{
    background-color: #00b8e0;
}

.nav-btn{
    background: transparent;
    border: none;
    padding: 12px 14px;
    border-radius: 10px;
    cursor: pointer;
    text-align: left;
    font-size: 16px;
    transition: all 0.25s ease;
    color: #374151;
}

.nav-btn:hover{
    background: #eef2ff;
    color: #4f46e5;
}

.nav-btn-active{
    background: transparent;
    color: #374151;
    border: none;
    padding: 12px 14px;
    border-radius: 10px;
    cursor: pointer;
    text-align: left;
    font-size: 16px;
    transition: all 0.25s ease;
}

.nav-btn-active:hover{
    background-color: #eef2ff;
    color: #4f46e5;
}

/* Main Content */

.content{
    flex: 1;
    padding: 40px;
}

.section{
    display: none;
}

.section.active{
    display: block;
}

h1{
    margin-bottom: 25px;
    font-size: 28px;
}

/* Cards */

.stats-grid{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card{
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover{
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.card h3{
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 10px;
}

.card p{
    font-size: 24px;
    font-weight: 600;
    color: #111827;
}

/* TASK INPUT */

.task-input{
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.task-input input{
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid #d1d5db;
    font-size: 14px;
    outline: none;
    transition: 0.2s ease;
}

.task-input select{
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid #d1d5db;
    font-size: 14px;
    outline: none;
    transition: 0.2s ease;
}

.task-input input:focus,
.task-input select:focus{
    border-color: #4f46ef;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

#addTaskBtn {
    background: #4f46ef;
    color: #ffffff;
    border: none;
    padding: 10px 18px;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.2s ease;
}

#addTaskBtn:hover {
    background: #4338ca;
}

/* TASK LIST */

#taskList{
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#taskList li{
    background: #ffffff;
    padding: 14px 18px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#analyticsContainer{
    background: #ffffff;
    padding: 30px;
    border-radius: 14px;
    border: 1px solid #e5e7eb;
}

/* Dark Mode Styles */
.dark-mode{
    background-color: #0d0d0d;
    color: #00f0f0;
}

.dark-mode .sidebar{
    background-color: #050505;
}

.dark-mode .card,
.dark-mode #analyticsContainer,
.dark-mode #taskList li {
    background-color: #1a1a1a;
    border: 1px solid #00f0f0;
    color: #00f0f0;
}

.dark-mode #totalTasks,
.dark-mode #completedTasks,
.dark-mode #completionRate{
    color: #00ffff;
}

.dark-mode .sidebar .nav-btn,
.dark-mode .sidebar .nav-btn-active{
    color: #00f0f0;
    background-color: transparent;
    border: 1px solid #00f0f0;
}

.dark-mode .task-input input,
.dark-mode .task-input select,
.dark-mode .task-input button{
    background-color: #222222;
    color: #00f0f0;
    border: 1px solid #00f0f0;
}

.dark-mode .content{
    background-color: #111111;
}

.dark-mode .card{
    background-color: #1a1a1a;
    border: 1px solid #00f0f0;
}

.dark-mode .card p,
.dark-mode .card h3{
    color: #00f0f0;
}

.dark-mode button:hover{
    background-color: #00f0f0;
    color: #0d0d0d;
}

.task-completed span{
    text-decoration: line-through;
    color: gray;
    opacity: 0.6;
    cursor: pointer;
}

#taskList li span{
    cursor: pointer;
}


#taskList .delete-task{
    background-color: #ff4d4f;
    color: #fff;
    border: none;
    padding: 6px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s ease, transform 0.2s ease;
}

#taskList .delete-task:hover{
    background-color: #d9363e;
    transform: scale(1.05);
}

@keyframes fadeInUp {
    0%{
        opacity: 0;
        transform: translateY(20px);
    }
    100%{
        opacity: 1;
        transform: translateY(0);
    }
}

#taskList li{
    animation: fadeInUp 0.3s ease forwards;
}