:root{
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-2: #020617;
    --card: #1e293b;
    --border: rgba(255,255,255,.08);
    --text: #e5e7eb;
    --muted: #9ca3af;
    --accent: #6366f1;
    --danger: #ef4444;
    --success: #22c55e;

    /* Priority colors */
    --urgent-bg: rgba(239, 68, 68, 0.15);
    --urgent-border: #ef4444;

    --standard-bg: rgba(234, 179, 8, 0.15);
    --standard-border: #eab308;

    --optional-bg: rgba(34, 197, 94, 0.15);
    --optional-border: #22c55e;
}

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, sans-serif;
}

body{
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    display: grid;
    grid-template-rows: auto 1fr auto;
}

/* HEADER */
header{
    background: var(--surface-2);
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

header h1{
    font-size: 32px;
}

/* MAIN LAYOUT */
main{
    display: grid;
    grid-template-columns: 260px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
        "aside input"
        "aside tasks";
}

/* ===============================
   SIDEBAR (ASIDE)
   =============================== */
aside{
    grid-area: aside;
    background: var(--surface-2);
    padding: 20px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 20px;

    /* future collapsible support */
    transition: width 0.25s ease, padding 0.25s ease;
}

/* Sections */
aside section{
    background: var(--surface);
    padding: 16px;
    border-radius: 14px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ===============================
   SEARCH BAR (fixed)
   =============================== */
aside section:first-child form{
    display: flex;
    width: 100%;
    background: var(--surface-2);
    border-radius: 12px;
    border: 1px solid var(--border);
    align-items: center;
    overflow: hidden;      /* keeps everything contained */
    gap: 0;                /* remove extra gaps */
}

#search_text{
    flex: 1 1 auto;        /* allow input to expand */
    padding: 10px 12px;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text);
    font-size: 15px;
    min-width: 0;          /* ensures input doesn't overflow flex container */
}

#search_text::placeholder{
    color: var(--muted);
}

aside section:first-child button{
    flex: 0 0 auto;        /* button takes only its content width */
    padding: 12px 14px;
    border: none;
    background: var(--accent);
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    border-left: 1px solid rgba(255,255,255,0.1);
}

aside section:first-child button:hover{
    filter: brightness(1.3);
}

aside section:first-child button:active{
    filter: brightness(1.7);
}

#clr_search_btn{
    border-radius: 10px;
}

/* ===============================
   FILTER FORM
   =============================== */
#filter_form{
    display: flex;
    flex-direction: column;
    gap: 18px;
}

#filter_form h3{
    font-size: 18px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

#filter_form > div{
    display: flex;
    flex-direction: column;
    gap: 6px;
}

#filter_form p{
    font-size: 14px;
    color: var(--muted);
}

/* ===============================
   FILTER PILLS (RADIOS)
   =============================== */
#filter_form label{
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 14px;
    width: fit-content;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.2s, border 0.2s, transform 0.1s;
}

#filter_form label:hover{
    transform: translateX(2px);
}

#filter_form input[type="radio"]{
    accent-color: var(--accent);
}

/* Status filters */
#filter_form label:has(input[value="Completed"]){
    color: var(--success);
    background: rgba(34,197,94,.12);
    border-color: rgba(34,197,94,.35);
}

#filter_form label:has(input[value="Remaining"]){
    color: var(--accent);
    background: rgba(99,102,241,.12);
    border-color: rgba(99,102,241,.35);
}

#filter_form label:has(input[value="All"]){
    color: var(--text);
    background: rgba(255,255,255,.05);
    border-color: var(--border);
}

/* Priority filters */
#filter_form label:has(input[value="Urgent"]){
    color: #ef4444;
    background: rgba(239,68,68,.12);
    border-color: rgba(239,68,68,.35);
}

#filter_form label:has(input[value="Standard"]){
    color: #eab308;
    background: rgba(234,179,8,.12);
    border-color: rgba(234,179,8,.35);
}

#filter_form label:has(input[value="Optional"]){
    color: #22c55e;
    background: rgba(34,197,94,.12);
    border-color: rgba(34,197,94,.35);
}

/* ===============================
   FILTER FORM
   =============================== */

#filter_form{
    display: flex;
    flex-direction: column;
    gap: 18px;
}

#filter_form h3{
    font-size: 18px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

#filter_form > div{
    display: flex;
    flex-direction: column;
    gap: 6px;
}

#filter_form p{
    font-size: 14px;
    color: var(--muted);
}

/* ===============================
   FILTER PILLS (RADIOS)
   =============================== */

#filter_form label{
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 14px;
    width: fit-content;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.2s, border 0.2s, transform 0.1s;
}

#filter_form label:hover{
    transform: translateX(2px);
}

#filter_form input[type="radio"]{
    accent-color: var(--accent);
}

/* Status filters */
#filter_form label:has(input[value="Completed"]){
    color: var(--success);
    background: rgba(34,197,94,.12);
    border-color: rgba(34,197,94,.35);
}

#filter_form label:has(input[value="Remaining"]){
    color: var(--accent);
    background: rgba(99,102,241,.12);
    border-color: rgba(99,102,241,.35);
}

#filter_form label:has(input[value="All"]){
    color: var(--text);
    background: rgba(255,255,255,.05);
    border-color: var(--border);
}

/* Priority filters */
#filter_form label:has(input[value="Urgent"]){
    color: #ef4444;
    background: rgba(239,68,68,.12);
    border-color: rgba(239,68,68,.35);
}

#filter_form label:has(input[value="Standard"]){
    color: #eab308;
    background: rgba(234,179,8,.12);
    border-color: rgba(234,179,8,.35);
}

#filter_form label:has(input[value="Optional"]){
    color: #22c55e;
    background: rgba(34,197,94,.12);
    border-color: rgba(34,197,94,.35);
}


/* INPUT AREA */
.inp{
    grid-area: input;
    background: var(--surface);
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
        "task task"
        "pri des";
    gap: 15px;
    border-bottom: 1px solid var(--border);
}

.box_btn{
    grid-area: task;
    display: flex;
    gap: 10px;
}

.box_btn input{
    flex: 1;
    padding: 12px;
    border-radius: 10px;
    border: none;
    background: var(--surface-2);
    color: var(--text);
    font-size: 16px;
}

.box_btn input::placeholder{
    color: var(--muted);
}

.box_btn button{
    padding: 0 22px;
    border-radius: 10px;
    border: none;
    background: var(--accent);
    color: white;
    cursor: pointer;
    font-weight: 600;
}

/* TEXTAREA */
textarea{
    grid-area: des;
    background: var(--surface-2);
    border: none;
    border-radius: 10px;
    padding: 12px;
    color: var(--text);
    resize: none;
}

/* PRIORITY */
.prty{
    grid-area: pri;
    background: var(--surface-2);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.prty p{
    color: var(--muted);
}

.prty label{
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 14px;
    width: fit-content;
    border: 1px solid transparent;
}

/* Urgent */
.prty label:has(input[value="Urgent"]){
    color: #ef4444;
    border-color: rgba(239,68,68,0.4);
    background: rgba(239,68,68,0.1);
}

/* Standard */
.prty label:has(input[value="Standard"]){
    color: #eab308;
    border-color: rgba(234,179,8,0.4);
    background: rgba(234,179,8,0.1);
}

/* Optional */
.prty label:has(input[value="Optional"]){
    color: #22c55e;
    border-color: rgba(34,197,94,0.4);
    background: rgba(34,197,94,0.1);
}

/* TASK LIST */
.task_list{
    grid-area: tasks;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
    gap: 20px;
    overflow-y: auto;
}

/* CARD */
.card{
    background: var(--card);
    min-height: 250px;
    border-radius: 16px;
    padding: 15px;
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 10px;
    border: 1px solid var(--border);
    transition: .2s;
}

.card:hover{
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,.4);
}

.card h3{
    font-size: 18px;
}

.card p{
    color: var(--muted);
    font-size: 14px;
}

/* Priority cards */
.card.urgent{
    background: var(--urgent-bg);
    border-color: var(--urgent-border);
    box-shadow: 0 0 0 1px rgba(239,68,68,0.2);
}

.card.standard{
    background: var(--standard-bg);
    border-color: var(--standard-border);
    box-shadow: 0 0 0 1px rgba(234,179,8,0.2);
}

.card.optional{
    background: var(--optional-bg);
    border-color: var(--optional-border);
    box-shadow: 0 0 0 1px rgba(34,197,94,0.2);
}

/* CARD BUTTONS */
.card button{
    padding: 10px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: 
        transform 0.15s ease,
        box-shadow 0.15s ease,
        filter 0.15s ease;
}

/* Hover */
.card button:hover{
    filter: brightness(1.1);
    box-shadow: 0 8px 20px rgba(0,0,0,.35);
    transform: translateY(-2px);
}

/* Click */
.card button:active{
    transform: translateY(1px) scale(0.98);
    box-shadow: 0 4px 10px rgba(0,0,0,.25);
    filter: brightness(0.95);
}

.btn_cmplt{
    background: var(--success);
    color: white;
}

.card.completed{
    opacity: 0.4;
    filter: grayscale(0.5);
}

.card.completed p, .card.completed h3{
    text-decoration: line-through;
}

.btn_del{
    background: var(--danger);
    color: white;
}

/* FOOTER */
footer{
    background: var(--surface-2);
    padding: 15px;
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--border);
    color: var(--muted);
}