/*=====================
    Universal Styles
=======================*/
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/*===================
    Variables
=====================*/
:root{
    --font-main: 'Outfit', sans-serif;
    --max-width: 1100px;
    --nav-height: 80px;
    --footer-height: 64px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --page-bg: #ffffff;
    --bg-start: #f7efe6;
    --bg-end: #d9e7ef;
    --bg-burst-a: #ffd9c9;
    --bg-burst-b: #cceaf0;
    --panel-bg: #fffdf9;
    --panel-border: #2f2a26;
    --primary-text: #1f1a16;
    --secondary-text: #70655a;
    --brand: #27c93f;
    --brand-dark: #1f9e34;
    --complete: #2f9e44;
    --danger: #d90429;
    --input-border: #3d342c;
    --focus-ring: #ffc6b3;
    --task-bg: #ffffff;
    --task-done-text: #6f7a82;
    --card-shadow: #1f1a16;
    --theme-btn-bg: #ffffff;
    --theme-btn-text: #1f1a16;
    --theme-btn-border: #2f2a26;
}

:root[data-theme="dark"]{
    --page-bg: #000000;
    --bg-start: #141b24;
    --bg-end: #1e2430;
    --bg-burst-a: #5e2c2f;
    --bg-burst-b: #2a5a66;
    --panel-bg: #1f2733;
    --panel-border: #d5dbe2;
    --primary-text: #ecf1f7;
    --secondary-text: #b8c2ce;
    --brand: #27c93f;
    --brand-dark: #4af062;
    --complete: #57ba6f;
    --danger: #ff5a79;
    --input-border: #ced6de;
    --focus-ring: #ff8b61;
    --task-bg: #2b3646;
    --task-done-text: #9ca8b7;
    --card-shadow: #0d1218;
    --theme-btn-bg: #2b3646;
    --theme-btn-text: #ecf1f7;
    --theme-btn-border: #d5dbe2;
}

body{
    min-height: 100vh;
    font-family: var(--font-main);
    color: var(--primary-text);
    background: var(--page-bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: transparent;
    transition: var(--transition);
    z-index: 1000;
}

.navbar.scrolled {
    background: color-mix(in srgb, var(--panel-bg) 90%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid color-mix(in srgb, var(--panel-border) 28%, transparent);
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-text);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
}

.logo span {
    color: var(--brand);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    color: var(--primary-text);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    border-radius: 8px;
    padding: 6px 10px;
    transition: color 0.25s ease, transform 0.25s ease, background-color 0.25s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--brand);
    background: color-mix(in srgb, var(--task-bg) 80%, transparent);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--brand);
    background: color-mix(in srgb, var(--task-bg) 88%, transparent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--primary-text);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

#theme-toggle:hover {
    background: color-mix(in srgb, var(--task-bg) 75%, transparent);
    color: var(--brand);
    transform: rotate(15deg);
}

#theme-toggle:focus-visible,
.hamburger:focus-visible,
#addTaskBtn:focus-visible,
.actions button:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 2px;
}

.hamburger{
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    border: none;
    background: transparent;
    padding: 0;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-text);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.toggle span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.toggle span:nth-child(2) {
    opacity: 0;
}

.hamburger.toggle span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.todo-wrapper{
    width: min(1100px, 92%);
    margin: var(--nav-height) auto 0;
    min-height: calc(100vh - var(--nav-height) - var(--footer-height));
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.site-footer {
    min-height: var(--footer-height);
    border-top: 1px solid color-mix(in srgb, var(--panel-border) 30%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    background: color-mix(in srgb, var(--panel-bg) 82%, transparent);
    color: var(--secondary-text);
    text-align: center;
    font-size: 0.92rem;
    font-family: "Courier New", Courier, monospace;
}

#home,
#todo {
    scroll-margin-top: calc(var(--nav-height) + 16px);
}

.todo-card{
    width: min(620px, 100%);
    background: var(--panel-bg);
    border: 2px solid var(--panel-border);
    border-radius: 18px;
    box-shadow: 0 14px 30px color-mix(in srgb, var(--card-shadow) 28%, transparent),
                0 6px 12px color-mix(in srgb, var(--card-shadow) 18%, transparent);
    padding: 28px 24px;
}

.todo-card h2{
    font-size: 2rem;
}

.subtitle{
    margin-top: 6px;
    color: var(--secondary-text);
    font-size: 0.95rem;
}

.input-row{
    margin-top: 18px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
}

#taskInput{
    border: 2px solid var(--input-border);
    border-radius: 10px;
    padding: 12px;
    font-size: 1rem;
    color: var(--primary-text);
    background: var(--task-bg);
}

#taskInput:focus{
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 45%, transparent);
}

#addTaskBtn{
    border: 0;
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 1rem;
    font-weight: 700;
    background: var(--brand);
    color: #fff;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

#addTaskBtn:hover{
    background: var(--brand-dark);
    transform: translateY(-1px);
}

#taskList{
    margin-top: 20px;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#taskList li{
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    border: 2px solid var(--input-border);
    border-radius: 10px;
    padding: 10px 12px;
    background: var(--task-bg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#taskList li:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px color-mix(in srgb, var(--card-shadow) 16%, transparent);
}

#taskList li span{
    cursor: pointer;
    word-break: break-word;
}

#taskList li.completed span{
    text-decoration: line-through;
    color: var(--task-done-text);
}

.actions{
    display: flex;
    gap: 8px;
}

.actions button{
    border: 0;
    border-radius: 8px;
    width: 34px;
    height: 34px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    color: #fff;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.actions button:hover {
    transform: translateY(-1px);
    filter: brightness(1.06);
}

.empty-state {
    text-align: center;
    color: var(--secondary-text);
    border-style: dashed !important;
}

.complete-btn{
    background: var(--complete);
}

.actions button:last-child{
    background: var(--danger);
}

@media (max-width: 700px){
    .nav-content {
        padding: 0 1rem;
    }

    .nav-links{
        position: fixed;
        top: 0;
        right: -100%;
        width: min(300px, 72%);
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 18px;
        border-left: 1px solid color-mix(in srgb, var(--panel-border) 35%, transparent);
        background: color-mix(in srgb, var(--panel-bg) 96%, transparent);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        transition: right 0.4s ease-in-out;
        z-index: 1000;
        box-shadow: -10px 0 30px color-mix(in srgb, var(--card-shadow) 24%, transparent);
        padding: 0;
    }

    .nav-links.nav-active{
        right: 0;
    }

    .nav-links a{
        display: block;
        padding: 8px 10px;
        font-size: 1.2rem;
    }

    .hamburger{
        display: flex;
        z-index: 1001;
    }

    .todo-card{
        box-shadow: 0 10px 20px color-mix(in srgb, var(--card-shadow) 26%, transparent);
        padding: 22px 16px;
    }

    .todo-card h2{
        font-size: 1.65rem;
    }

}