:root {
    --bg-color: linear-gradient(#0d0d0d, #300651);
    --text-color: #e4e4e4;
    --card-bg: #111;
    --card-border: #222;
    --logo: #fff;
    --nav-links-hover: #bbb;
    --button-color: linear-gradient(#4e0b82, #7313bc);
}

.light-mode {
    --bg-color: linear-gradient(#fee8e8, #b07cd7);
    --text-color: #232323;
    --card-bg: #ffe2e2;
    --card-border: #beb6b6;
    --logo: #080808;
    --nav-links-hover: #636363;
    --button-color: linear-gradient(#ba90db , #7e40ac);
}

* {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
 font-family: 'Segoe UI', sans-serif;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 0;
}

header {
    width: 100%;
    padding: 20px 40px;
    background: var(--card-bg);
    position:sticky;
    top: 0;
    border-bottom: 1px solid var(--card-border);
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--logo);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--nav-links-hover);
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s;
}

.theme-toggle {
    background: var(--card-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 35px;
    height: 35px;
    border: none;
    cursor: pointer;
    border-radius: 50%;
    transition: transform 220ms ease, box shadow 220ms ease, opacity 220ms ease;
}

.theme-toggle:hover {
    opacity: 0.5;
}

.hamburger {
    display: none;
    font-size: 28px;
    background: none;
    color: white;
    border: none;
    cursor: pointer;
    z-index: 10000;
    position: relative;
}

.container{
    display: grid;
    grid-template-columns: repeat(auto fit, minmax(250px, 1fr));
    gap: 20px;
    align-items: stretch;
}

.task-manager-card{
    background: var(--card-bg);
    margin-top: 20px;
    padding: 20px;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    transition: all 0.3s ease;
    width: 75%;
    height: auto;
    width: 75%;
    margin: 0 auto;
    align-items: center;
    justify-content: center;
    gap: 50px;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
}

.task-manager-card p{
    font-size: 18px;
}

.task-manager-card .btn, .upbtn{
    padding: 10px 20px;
    background: var(--button-color);
    background-size: 100% 200%;
    background-position: 0 0; 
    color: var(--text-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    margin-top: 10px;
    transition: background-position 0.3s ease, transform 0.3s ease;
    outline: none;
    border: none;
    cursor: pointer;
    transition: transform 220ms ease, box shadow 220ms ease, opacity 220ms ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.25);
    will-change: transform, box-shadow;
    align-self: start;
}

.task-manager-card  .btn:hover, .upbtn:hover,
.task-manager-card .btn:focus, .upbtn:focus{
    transform: translateY(-2px);
    background-position: 0 100%; 
    transform: translateY(-5px);
    box-shadow: 
    0 6px 1px rgba(0,0,0,0.35),
    0 0 28px rgba(0,153,255,0.30);
    outline: none;
}

.task-manager-card .btn:focus-visible{
    box-shadow:
    0 6px 18px rgba(0,0,0,0.35),
    0 0 36px rgba(0,153,255,0.35);
    border: 1px solid rgba(0,153,255,0.25)
}

.task-manager-card .btn:active, .upbtn:active {
    transform: translateY(2px);
}

.task-manager-ss{
    height: 30vw;
}

.buttons{
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-self: self-start;
}

@media (max-width: 800px ) {

    .nav-links {
        display: none;
        flex-direction: column;
        background: var(--card-bg);
        position: absolute;
        top: 100%; 
        right: 16px;
        width: 100%;
        max-width: calc(100% - 32px);
        border: 1px solid var(--card-border);
        border-radius: 8px;
        padding: 20px;
        gap: 20px;
        border-left: 1px solid var(--card-border);
        border-bottom: 1px solid var(--card-border);
    }
    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    header {
        padding: 12px 20px;
    }

    .hamburger {
        font-size: 26px;
        padding: 6px 8px;
    }
    .project-card {
       max-width: 350%;
       width: 100%;
       margin: 0 auto;
    }
}