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

body {
    min-height: 100vh;
    background:
        radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 40%),
        linear-gradient(135deg, #020617, #000000);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    padding: 20px;
}

.todo-container {
    width: 95%;
    max-width: 480px;
    padding: 30px 25px;
    border-radius: 25px;

    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    border: 3px solid rgba(255, 255, 255, 0.15);

    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.8),
        inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.todo-container h1 {
    text-align: center;
    margin-bottom: 20px;
    font-weight: 600;
    color: #38bdf8;
}

.input-box {
    display: flex;
    gap: 10px;
}

.input-box input {
    flex: 1;
    padding: 12px;
    background: #020617;
    border: 1px solid #1e293b;
    border-radius: 10px;
    color: #fff;
    outline: none;
}

.input-box input::placeholder {
    color: #94a3b8;
}

.input-box button {
    width: 50px;
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    border: none;
    border-radius: 10px;
    font-size: 22px;
    font-weight: bold;
    color: #020617;
    cursor: pointer;
    transition: 0.3s;
}

.input-box button:hover {
    transform: scale(1.1);
}

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

li {
    background: rgba(2, 6, 23, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 12px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    animation: fadeIn 0.3s ease;
}

li.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

li.completed span {
    text-decoration: line-through;
    opacity: 0.5;
    filter: blur(0.5px);
    transition: all 0.3s ease;
}

li span {
    cursor: pointer;
}

.actions {
    display: flex;
    gap: 10px;
}

/* Base premium button */
.actions button {
    position: relative;
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 999px;
    border: 1px solid rgba(56, 189, 248, 0.35);
    background: rgba(15, 23, 42, 0.65);
    color: #e5e7eb;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    overflow: hidden;
}

/* Neon glow layer */
.actions button::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        transparent,
        rgba(56, 189, 248, 0.4),
        transparent
    );
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Hover effect */
.actions button:hover::before {
    opacity: 1;
}

.actions button:hover {
    color: #38bdf8;
    transform: translateY(-2px) scale(1.05);
    box-shadow:
        0 0 10px rgba(56, 189, 248, 0.35),
        0 0 25px rgba(56, 189, 248, 0.15);
}

/* Edit button accent */
.actions button.edit {
    border-color: rgba(56, 189, 248, 0.5);
}

/* Delete button accent */
.actions button.delete {
    border-color: rgba(248, 113, 113, 0.5);
    color: #fca5a5;
}

.actions button.delete:hover {
    color: #f87171;
    box-shadow:
        0 0 10px rgba(248, 113, 113, 0.4),
        0 0 25px rgba(248, 113, 113, 0.2);
}

/* Inline edit style */
.editing-text {
    outline: none;
    padding: 4px 6px;
    border-radius: 6px;
    background: rgba(56, 189, 248, 0.08);
    box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.4);
}

/* While editing, disable strike toggle */
li.editing span {
    cursor: text;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.task-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #38bdf8; /* neon blue tick */
    cursor: pointer;
}

/* ========================= */
/* 📱 Mobile Responsive */
/* ========================= */

@media (max-width: 480px) {

    .todo-container {
        padding: 20px 18px;
        border-radius: 20px;
    }

    .todo-container h1 {
        font-size: 20px;
    }

    .input-box {
        flex-direction: column;
    }

    .input-box button {
        width: 100%;
        height: 45px;
    }

    li {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .actions {
        width: 100%;
        justify-content: flex-end;
    }

    .actions button {
        padding: 6px 12px;
        font-size: 12px;
    }
}

@media (min-width: 768px) {
    .todo-container {
        max-width: 520px;
    }
}